Corpus Luteum Maintenance: Process of maintaining the functions of CORPORA LUTEA, specifically PROGESTERONE production which is regulated primarily by pituitary LUTEINIZING HORMONE in cycling females, and by PLACENTAL HORMONES in pregnant females. The ability to maintain luteal functions is important in PREGNANCY MAINTENANCE.Corpus Luteum: The yellow body derived from the ruptured OVARIAN FOLLICLE after OVULATION. The process of corpus luteum formation, LUTEINIZATION, is regulated by LUTEINIZING HORMONE.Luteolysis: Degradation of CORPUS LUTEUM. In the absence of pregnancy and diminishing trophic hormones, the corpus luteum undergoes luteolysis which is characterized by the involution and cessation of its endocrine function.Progesterone: The major progestational steroid that is secreted primarily by the CORPUS LUTEUM and the PLACENTA. Progesterone acts on the UTERUS, the MAMMARY GLANDS and the BRAIN. It is required in EMBRYO IMPLANTATION; PREGNANCY maintenance, and the development of mammary tissue for MILK production. Progesterone, converted from PREGNENOLONE, also serves as an intermediate in the biosynthesis of GONADAL STEROID HORMONES and adrenal CORTICOSTEROIDS.Corpus Luteum HormonesLuteal Cells: PROGESTERONE-producing cells in the CORPUS LUTEUM. The large luteal cells derive from the GRANULOSA CELLS. The small luteal cells derive from the THECA CELLS.Luteal Phase: The period in the MENSTRUAL CYCLE that follows OVULATION, characterized by the development of CORPUS LUTEUM, increase in PROGESTERONE production by the OVARY and secretion by the glandular epithelium of the ENDOMETRIUM. The luteal phase begins with ovulation and ends with the onset of MENSTRUATION.Corpus Callosum: Broad plate of dense myelinated fibers that reciprocally interconnect regions of the cortex in all lobes with corresponding regions of the opposite hemisphere. The corpus callosum is located deep in the longitudinal fissure.Dinoprost: A naturally occurring prostaglandin that has oxytocic, luteolytic, and abortifacient activities. Due to its vasocontractile properties, the compound has a variety of other biological actions.Pseudopregnancy: An acyclic state that resembles PREGNANCY in that there is no ovarian cycle, ESTROUS CYCLE, or MENSTRUAL CYCLE. Unlike pregnancy, there is no EMBRYO IMPLANTATION. Pseudopregnancy can be experimentally induced to form DECIDUOMA in the UTERUS.Estrus: The period in the ESTROUS CYCLE associated with maximum sexual receptivity and fertility in non-primate female mammals.Estrous Cycle: The period of cyclic physiological and behavior changes in non-primate female mammals that exhibit ESTRUS. The estrous cycle generally consists of 4 or 5 distinct periods corresponding to the endocrine status (PROESTRUS; ESTRUS; METESTRUS; DIESTRUS; and ANESTRUS).Agenesis of Corpus Callosum: Birth defect that results in a partial or complete absence of the CORPUS CALLOSUM. It may be isolated or a part of a syndrome (e.g., AICARDI'S SYNDROME; ACROCALLOSAL SYNDROME; ANDERMANN SYNDROME; and HOLOPROSENCEPHALY). Clinical manifestations include neuromotor skill impairment and INTELLECTUAL DISABILITY of variable severity.Ovary: The reproductive organ (GONADS) in female animals. In vertebrates, the ovary contains two functional parts: the OVARIAN FOLLICLE for the production of female germ cells (OOGENESIS); and the endocrine cells (GRANULOSA CELLS; THECA CELLS; and LUTEAL CELLS) for the production of ESTROGENS and PROGESTERONE.Pregnancy: The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH.Pregnancy, Animal: The process of bearing developing young (EMBRYOS or FETUSES) in utero in non-human mammals, beginning from FERTILIZATION to BIRTH.Chorionic Gonadotropin: A gonadotropic glycoprotein hormone produced primarily by the PLACENTA. Similar to the pituitary LUTEINIZING HORMONE in structure and function, chorionic gonadotropin is involved in maintaining the CORPUS LUTEUM during pregnancy. CG consists of two noncovalently linked subunits, alpha and beta. Within a species, the alpha subunit is virtually identical to the alpha subunits of the three pituitary glycoprotein hormones (TSH, LH, and FSH), but the beta subunit is unique and confers its biological specificity (CHORIONIC GONADOTROPIN, BETA SUBUNIT, HUMAN).Cattle: Domesticated bovine animals of the genus Bos, usually kept on a farm or ranch and used for the production of meat or dairy products or for heavy labor.Ovarian Follicle: An OOCYTE-containing structure in the cortex of the OVARY. The oocyte is enclosed by a layer of GRANULOSA CELLS providing a nourishing microenvironment (FOLLICULAR FLUID). The number and size of follicles vary depending on the age and reproductive state of the female. The growing follicles are divided into five stages: primary, secondary, tertiary, Graafian, and atretic. Follicular growth and steroidogenesis depend on the presence of GONADOTROPINS.Luteinizing Hormone: A major gonadotropin secreted by the adenohypophysis (PITUITARY GLAND, ANTERIOR). Luteinizing hormone regulates steroid production by the interstitial cells of the TESTIS and the OVARY. The preovulatory LUTEINIZING HORMONE surge in females induces OVULATION, and subsequent LUTEINIZATION of the follicle. LUTEINIZING HORMONE consists of two noncovalently linked subunits, alpha and beta. Within a species, the alpha subunit is common in the three pituitary glycoprotein hormones (TSH, LH and FSH), but the beta subunit is unique and confers its biological specificity.Ovulation: The discharge of an OVUM from a rupturing follicle in the OVARY.Menstrual Cycle: The period from onset of one menstrual bleeding (MENSTRUATION) to the next in an ovulating woman or female primate. The menstrual cycle is regulated by endocrine interactions of the HYPOTHALAMUS; the PITUITARY GLAND; the ovaries; and the genital tract. The menstrual cycle is divided by OVULATION into two phases. Based on the endocrine status of the OVARY, there is a FOLLICULAR PHASE and a LUTEAL PHASE. Based on the response in the ENDOMETRIUM, the menstrual cycle is divided into a proliferative and a secretory phase.Luteolytic Agents: Chemical compounds causing LUTEOLYSIS or degeneration.Oxytocin: A nonapeptide hormone released from the neurohypophysis (PITUITARY GLAND, POSTERIOR). It differs from VASOPRESSIN by two amino acids at residues 3 and 8. Oxytocin acts on SMOOTH MUSCLE CELLS, such as causing UTERINE CONTRACTIONS and MILK EJECTION.Estradiol: The 17-beta-isomer of estradiol, an aromatized C18 steroid with hydroxyl group at 3-beta- and 17-beta-position. Estradiol-17-beta is the most potent form of mammalian estrogenic steroids.3-Hydroxysteroid Dehydrogenases: Catalyze the oxidation of 3-hydroxysteroids to 3-ketosteroids.Granulosa Cells: Supporting cells for the developing female gamete in the OVARY. They are derived from the coelomic epithelial cells of the gonadal ridge. Granulosa cells form a single layer around the OOCYTE in the primordial ovarian follicle and advance to form a multilayered cumulus oophorus surrounding the OVUM in the Graafian follicle. The major functions of granulosa cells include the production of steroids and LH receptors (RECEPTORS, LH).Sheep: Any of the ruminant mammals with curved horns in the genus Ovis, family Bovidae. They possess lachrymal grooves and interdigital glands, which are absent in GOATS.Macropodidae: A family of herbivorous leaping MAMMALS of Australia, New Guinea, and adjacent islands. Members include kangaroos, wallabies, quokkas, and wallaroos.Relaxin: A water-soluble polypeptide (molecular weight approximately 8,000) extractable from the corpus luteum of pregnancy. It produces relaxation of the pubic symphysis and dilation of the uterine cervix in certain animal species. Its role in the human pregnant female is uncertain. (Dorland, 28th ed)Diestrus: A phase of the ESTROUS CYCLES that follows METESTRUS. Diestrus is a period of sexual quiescence separating phases of ESTRUS in polyestrous animals.Theca Cells: The flattened stroma cells forming a sheath or theca outside the basal lamina lining the mature OVARIAN FOLLICLE. Thecal interstitial or stromal cells are steroidogenic, and produce primarily ANDROGENS which serve as precusors of ESTROGENS in the GRANULOSA CELLS.Cholesterol Side-Chain Cleavage Enzyme: A mitochondrial cytochrome P450 enzyme that catalyzes the side-chain cleavage of C27 cholesterol to C21 pregnenolone in the presence of molecular oxygen and NADPH-FERRIHEMOPROTEIN REDUCTASE. This enzyme, encoded by CYP11A1 gene, catalyzes the breakage between C20 and C22 which is the initial and rate-limiting step in the biosynthesis of various gonadal and adrenal steroid hormones.Receptors, LH: Those protein complexes or molecular sites on the surfaces and cytoplasm of gonadal cells that bind luteinizing or chorionic gonadotropic hormones and thereby cause the gonadal cells to synthesize and secrete sex steroids. The hormone-receptor complex is internalized from the plasma membrane and initiates steroid synthesis.Prostaglandins F: (9 alpha,11 alpha,13E,15S)-9,11,15-Trihydroxyprost-13-en-1-oic acid (PGF(1 alpha)); (5Z,9 alpha,11,alpha,13E,15S)-9,11,15-trihydroxyprosta-5,13-dien-1-oic acid (PGF(2 alpha)); (5Z,9 alpha,11 alpha,13E,15S,17Z)-9,11,15-trihydroxyprosta-5,13,17-trien-1-oic acid (PGF(3 alpha)). A family of prostaglandins that includes three of the six naturally occurring prostaglandins. All naturally occurring PGF have an alpha configuration at the 9-carbon position. They stimulate uterine and bronchial smooth muscle and are often used as oxytocics.Marsupialia: An infraclass of MAMMALS, also called Metatheria, where the young are born at an early stage of development and continue to develop in a pouch (marsupium). In contrast to Eutheria (placentals), marsupials have an incomplete PLACENTA.Cloprostenol: A synthetic prostaglandin F2alpha analog. The compound has luteolytic effects and is used for the synchronization of estrus in cattle.RNA, Messenger: RNA sequences that serve as templates for protein synthesis. Bacterial mRNAs are generally primary transcripts in that they do not require post-transcriptional processing. Eukaryotic mRNA is synthesized in the nucleus and must be exported to the cytoplasm for translation. Most eukaryotic mRNAs have a sequence of polyadenylic acid at the 3' end, referred to as the poly(A) tail. The function of this tail is not known for certain, but it may play a role in the export of mature mRNA from the nucleus as well as in helping stabilize some mRNA molecules by retarding their degradation in the cytoplasm.Luteinization: Formation of CORPUS LUTEUM. This process includes capillary invasion of the ruptured OVARIAN FOLLICLE, hypertrophy of the GRANULOSA CELLS and the THECA CELLS, and the production of PROGESTERONE. Luteinization is regulated by LUTEINIZING HORMONE.Uterus: The hollow thick-walled muscular organ in the female PELVIS. It consists of the fundus (the body) which is the site of EMBRYO IMPLANTATION and FETAL DEVELOPMENT. Beyond the isthmus at the perineal end of fundus, is CERVIX UTERI (the neck) opening into VAGINA. Beyond the isthmi at the upper abdominal end of fundus, are the FALLOPIAN TUBES.Prolactin: A lactogenic hormone secreted by the adenohypophysis (PITUITARY GLAND, ANTERIOR). It is a polypeptide of approximately 23 kD. Besides its major action on lactation, in some species prolactin exerts effects on reproduction, maternal behavior, fat metabolism, immunomodulation and osmoregulation. Prolactin receptors are present in the mammary gland, hypothalamus, liver, ovary, testis, and prostate.Contraception, Immunologic: Contraceptive methods based on immunological processes and techniques, such as the use of CONTRACEPTIVE VACCINES.Vaccines, Contraceptive: Vaccines or candidate vaccines used to prevent conception.Population Control: Includes mechanisms or programs which control the numbers of individuals in a population of humans or animals.Macaca radiata: A species of macaque monkey that mainly inhabits the forest of southern India. They are also called bonnet macaques or bonnet monkeys.Encyclopedias as Topic: Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)Egg Proteins: Proteins which are found in eggs (OVA) from any species.Zona Pellucida: A tough transparent membrane surrounding the OVUM. It is penetrated by the sperm during FERTILIZATION.Myometrium: The smooth muscle coat of the uterus, which forms the main mass of the organ.Uterine Contraction: Contraction of the UTERINE MUSCLE.Muscle, Smooth: Unstriated and unstriped muscle, one of the muscles of the internal organs, blood vessels, hair follicles, etc. Contractile elements are elongated, usually spindle-shaped cells with centrally located nuclei. Smooth muscle fibers are bound together into sheets or bundles by reticular fibers and frequently elastic nets are also abundant. (From Stedman, 25th ed)Reproduction: The total process by which organisms produce offspring. (Stedman, 25th ed)Muscle Contraction: A process leading to shortening and/or development of tension in muscle tissue. Muscle contraction occurs by a sliding filament mechanism whereby actin filaments slide inward among the myosin filaments.
Pregnancy, parturition, and lactation in hypophyseal stalk-transected beef heifers. (1/99)Progesterone secretion is crucial for maintaining pregnancy to parturition in mammalian species, and in cattle the corpus luteum is the primary source of this hormone. This study determined the roles of prolactin (PRL), growth hormone (GH) and luteinizing hormone (LH) in the luteotropic process in beef heifers hypophyseal stalk-transected (HST, n=7) or sham operated (sham operated controls, SOC, n=9) during midgestation. The main finding was that endogenous PRL and GH maintained progesterone secretion in HST heifers in a similar manner to that in SOC throughout pregnancy. Serum PRL averaged 37 vs 187 and GH 2 vs 4 ng/ml in HST heifers compared with SOC, whereas LH abruptly decreased to undetectable levels after HST compared with a modest 0.4 ng/ml in SOC heifers. The second finding was that parturition and lactation occurred in HST heifers with calf delivery induced to occur at the same time as SOC. Milk production in HST animals was severely limited, and postpartum estrus obliterated compared with SOC. The suckling stimulus sustained milk ejection in HST heifers in spite of diminished PRL, GH, thyroid stimulating hormone, thyroxine and tri-iodothyronine secretion. The results suggest that PRL, GH and possibly placental lactogen are luteotropic during pregnancy in cattle. (+info)
Source and site of action of anti-luteolytic interferon in red deer (Cervus elaphus): possible involvement of extra-ovarian oxytocin secretion in maternal recognition of pregnancy. (2/99)Six conceptuses were collected from red deer hinds on day 22 after synchronization of oestrus with intravaginal progesterone-releasing devices (removal of device = day 0). Within 24 h of culture in vitro, the supernatant from five of six conceptuses showed detectable antiviral activity. Interferon alpha (IFN-alpha) receptors were identified by immunohistochemistry on the luminal surface of the endometrium, in the neurohypophysis and paraventricular hypothalamus, but not in the ovaries of the hinds from which the conceptuses were collected. Another 16 intact hinds were synchronized as above. Injection of 4 mg IFN i.m. twice a day on days 13-15 had no effect on cloprostenol-induced oxytocin secretion on day 15 and did not prevent cloprostenol-induced luteal regression. Sixteen ovariectomized hinds received a protocol of steroid treatment to mimic ovarian hormone secretion during the normal oestrous cycle. On day 16, hinds showed undulant oxytocin secretion that showed a degree of temporal association with uterine PGF2 alpha release. Treatment with 4 mg IFN-alpha I 1 twice a day on days 13-16 had no effect on this spontaneous oxytocin secretion, but reduced the magnitude of cloprostenol-induced oxytocin secretion on day 17 (P < 0.05). These results indicate that red deer conceptuses secrete an anti-luteolytic IFN to which the endometrium expresses a receptor during early pregnancy. The presence of IFN receptors in the hypothalamus and posterior pituitary and the IFN-induced suppression of extra-ovarian oxytocin secretion provides tentative evidence of an involvement of the central nervous system in maternal recognition of pregnancy in deer. (+info)
Rearrangement of extracellular matrix during cluster formation by human luteinising granulosa cells in culture. (3/99)Human ovarian granulosa cells were cultured on a basement membrane preparation (Matrigel) to investigate the role of extracellular matrix components in granulosa cell cluster formation. Time-lapse videomicroscopy of these cultures revealed a rapid aggregation of cells which was initiated during the first 2-4 h of culture so that by 8 h most of the granulosa cells were incorporated into clusters. Further amalgamation then occurred with the transfer of cells along 'bridges' between combining clusters. The clustering process, which was complete by about 24 h, was accompanied by reorganisation of matrix which was visualised by immunolabelling of laminin. Clustering cells appeared to gather matrix which became distributed around the clusters. Confocal microscopy showed matrix to be present over the surface of each cluster as well as around the base apparently anchoring the aggregate to the culture surface. Results suggest the potential for active rearrangement of matrix by granulosa-derived cells during corpus luteum development. (+info)
Relationship between different stages of the corpus luteum and the expression of the peroxisome proliferator-activated receptor gamma protein in bovine large lutein cells. (4/99)Lutein cells produce progestins that support pregnancy. Steroidogenesis requires coordination of the anabolic and catabolic pathways of lipid metabolism. Peroxisome proliferator-activated receptors (PPAR) are transcription factors that are central in the regulation of lipid metabolism. Hence, they may play a role in regulation of the development and regression of the corpus luteum. The present study investigated the expression of PPAR-gamma, n during different stages of the corpus luteum. Lutein cells were isolated mechanically from non-pregnant and pregnant heifers on days 5, 12 and 20 of the oestrous cycle (n = 3 for each day). PPAR-gamma in single cells was analysed by flow cytometry. PPAR-gamma 1 and PPAR-gamma 2 isoforms were distinguished by immunoblotting. The cell cycle of the lutein cells was measured by the flow cytometric quantification of DNA in single cells, using propidium iodide staining after ethanol fixation and RNAse treatment, and by the detection of the proliferating cell nuclear antigen (PCNA). The response of the cells to PPAR-gamma agonist 15-deoxy-delta 12,14 prostaglandin J2 (15dPGJ2, 200 and 490 nmol l-1) with and without changing the cell cycle by the anti-apoptogenic drug aurintricarboxylic acid (ATA, 10 mumol l-1) was used as an in vitro model to study the relationship between the cell cycle and PPAR-gamma. The concentration of PPAR-gamma per cell from non-pregnant heifers was significantly higher on day 5 (3.40 +/- 0.30 fmol) compared with that on day 12 (1.34 +/- 0.18 fmol, P < 0.05) and day 20 (0.55 +/- 0.2 fmol, P < 0.05). In pregnant heifers, the concentration of PPAR-gamma was significantly (P < 0.01) higher than in non-pregnant heifers. A decrease in the PPAR-gamma 1 isoform relative to PPAR-gamma 2 was observed in cells on day 12 of the oestrous cycle compared with day 5. The cell cycle (S phase portion in cells on days 5, 12 and 20: 16 +/- 4%, 6 +/- 4% and 4 +/- 3%, respectively) and the portion of cells with PCNA correlated with the amount of PPAR-gamma in non-pregnant heifers. ATA promoted the S phase in cells of non-pregnant heifers (day 12) and the endogenous agonist of PPAR-gamma, 15dPGJ2, inhibited the response to ATA in a dose-dependent manner, indicating that PPAR-gamma plays a role in the arrest of the cell cycle in lutein cells to maintain their differentiated state. (+info)
The regulation of the human corpus luteum steroidogenesis: a hypothesis? (5/99)The corpus luteum (CL) is an important endocrine organ in the menstrual cycle and in pregnancy. The regulation of its hormonal production has been extensively studied. The steroidogenic abilities of the CL can be rescued by human chorionic gonadotrophin (HCG) but its role in the maintenance of CL function is not clear. We will discuss the hypothesis that there are fetoplacental factors, other than HCG, that modulate CL steroidogenesis. (+info)
Growth hormone: roles in female reproduction. (6/99)GH, as its name suggests, is obligatory for growth and development. It is, however, also involved in the processes of sexual differentiation and pubertal maturation and it participates in gonadal steroidogenesis, gametogenesis and ovulation. It also has additional roles in pregnancy and lactation. These actions may reflect direct endocrine actions of pituitary GH or be mediated by its induction of hepatic or local IGF-I production. However, as GH is also produced in gonadal, placental and mammary tissues, it may act in paracrine or autocrine ways to regulate local processes that are strategically regulated by pituitary GH. The concept that GH is an important modulator of female reproduction is the focus of this review. (+info)
Production and localisation of angiotensin II in the bovine early corpus luteum: a possible interaction with luteal angiogenic factors and prostaglandin F2 alpha. (7/99)The newly formed corpus luteum (CL) rapidly develops after ovulation and has the features of active vascularisation and mitosis of steroidogenic cells. These stage-specific mechanisms also may contribute to gain the function of prostaglandin F2 alpha (PGF2 alpha)-resistant CL at this stage. Recent studies suggest that the vasoactive peptide angiotensin II (Ang II) regulates luteal function. Thus, this study aimed to investigate (i) the expression of angiotensin-converting enzyme (ACE) mRNA by RT-PCR and the ACE protein expression by immunohistochemistry, (ii) the effects of angiogenic growth factors, basic fibroblast growth factor (bFGF) and vascular endothelial growth factor (VEGF), on the secretion of Ang II, PGF2 alpha, progesterone and oxytocin (OT), and (iii) the effects of luteal vasoactive peptides (Ang II and endothelin-1 (ET-1)) or OT on the secretion of PGF2 alpha, progesterone and OT from bovine early CL (days 3--4 of the oestrous cycle), and evaluate a possible interaction of these substances with PGF2 alpha. The expression of mRNA for ACE was found in theca interna of mature follicle, early CL and endothelial cells from developing CL as well as pituitary and kidney, but granulosa cells of mature follicle were negative. The immunohistochemical analysis revealed that blood capillaries (endothelial cells) were stained for ACE, but luteal cells were negative in early CL. To examine the effects of substances on the secretory function of the CL, an in vitro microdialysis system was used as a model. The infusion of bFGF and VEGF stimulated Ang II and PGF2 alpha secretion as well as progesterone, but not OT secretion in early CL. The infusion of Ang II after PGF2 alpha infusion continued the stimulatory effect on progesterone and OT release within early CL until 3 h thereafter. However, the infusion of ET-1 alone had no effect on progesterone or OT release. The infusion of luteal peptides such as Ang II and OT stimulated PGF2 alpha secretion, whereas the infusion of ET-1 did not. In conclusion, the overall results of this study indicate that a functional angiotensin system exists on the endothelial cells of early CL, and that angiogenic factors bFGF and VEGF upregulate luteal Ang II and PGF2 alpha secretion, which fundamentally supports the mechanism of progesterone secretion in bovine early CL. This idea supports the concept that the local regulatory mechanism involved in active angiogenesis ensures the progesterone secretion in the developing CL in vivo. (+info)
Characteristics of infertility in female hypothyroid (hyt) mice. (8/99)Female hypothyroid (hyt) mice are infertile, but the reason for this infertility is not yet known. The present study was conducted to determine whether hypothyroidism induced infertility in immature and mature hyt mice. Furthermore, animals were treated with thyroxine and gonadotrophins at different times to determine whether infertility was due to failure of follicular development, implantation or pregnancy. There were no significant differences in the numbers of ovulated eggs induced by gonadotrophin treatment or the percentages of eggs developed in vitro among immature normal controls, hyt and thyroxine-treated hyt mice. Mature hyt mice showed continuous dioestrus, and ovulated significantly fewer eggs after gonadotrophin treatment and failed to establish pregnancy after mating compared with mature control mice. Mature hyt mice had significantly fewer corpora lutea > 500 microm in diameter and significantly lower progesterone concentrations. Thyroxine treatment before mating in hyt mice resulted in well-developed corpora lutea, an increase in progesterone and normal pregnancy, regardless of subsequent thyroxine administration. In conclusion, infertility occurs in mature rather than immature hyt mice, is due to the failure of follicular development and pregnancy, and can be reversed by thyroxine treatment before mating. (+info)
"The significance of the human corpus luteum in pregnancy maintenance". Am J Obstet Gynecol. 112: 1061-1067. Nash, H; ED ... The main function of hCG is to sustain the ovarian corpus luteum during pregnancy past the time it would normally decay as part ... For the first 7-9 weeks in humans, the corpus luteum secretes the progesterone necessary to maintain the viability of the ...
The hormone prolactin produced regulates the activation and early maintenance of corpus luteum. The corpus luteum is known as a ... In most species, the corpus luteum is degraded in the absence of a pregnancy. However, in some species, the corpus luteum may ... and instead the corpus luteum persists regardless of pregnancy. Since the corpus luteum is not degraded, it will cause the ... meaning that they will only ovulate and produce a corpus luteum if they are bred. The corpus luteum persists as if the queen ...
Human chorionic gonadotropin
... interacts with the LHCG receptor of the ovary and promotes the maintenance of the corpus luteum ... This allows the corpus luteum to secrete the hormone progesterone during the first trimester. Progesterone enriches the uterus ... As HCG supports the corpus luteum, administration of HCG is used in certain circumstances to enhance the production of ...
Thus, a single hormone, GnRH1, controls a complex process of follicular growth, ovulation, and corpus luteum maintenance in the ...
List of MeSH codes (G08)
... pregnancy maintenance MeSH G08.520.769.520.500 --- corpus luteum maintenance MeSH G08.520.769.525 --- pregnancy, multiple MeSH ... corpus luteum maintenance MeSH G08.520.440.508.380 --- luteolysis MeSH G08.520.440.508.493 --- ovulation inhibition MeSH ...
... and maintenance, respectively. It also produces relaxin, a hormone responsible for softening of the pubic symphysis which helps ... Once the corpus luteum regresses the remnant is known as corpus albicans. The corpus luteum is essential for establishing and ... The corpus luteum (Latin for "yellow body"; plural corpora lutea) is a temporary endocrine structure in female ovaries and is ... Order of changes in ovary Human ovary with fully developed corpus luteum Luteinized follicular cyst. H&E stain. Corpus Luteum ...
Estrogen receptor alpha
... which also lack the corpus luteum, and therefore do not ovulate. This adult ovarian phenotype suggests that in the absence of ... Though its expression in bone is moderate, ERα is known to be responsible for maintenance of bone integrity. It is hypothesized ... ERα is similarly essential in the maturation and maintenance of the male reproductive phenotype, as male ERKO mice are ... which in turn regulate bone development and maintenance. Accordingly, male and female ERKO mice exhibit decreased bone length ...
Corpora lutea are found only in mammals, and in some elasmobranch fish; in other species, the remnants of the follicle are ... They hypothesized that DNA double-strand break repair is vital for the maintenance of oocyte reserve and that a decline in ... Also in the cortex is the corpus luteum derived from the follicles. The innermost layer is the ovarian medulla. It can be hard ... The follicle remains functional and reorganizes into a corpus luteum, which secretes progesterone in order to prepare the ...
... stimulates the ovarian production of estrogens by the granulosa cells of the ovarian follicles and corpora lutea. Some ... Estrogens are responsible for maturation and maintenance of the vagina and uterus, and are also involved in ovarian function, ... In addition, estrogens are responsible for bone maturation and maintenance of bone mineral density throughout life. Due to ... with progesterone promotes and maintains the uterus lining in preparation for implantation of fertilized egg and maintenance of ...
A rise in pituitary FSH caused by the disintegration of the corpus luteum at the conclusion of the twelfth menstrual cycle ... They hypothesized that DNA double-strand break repair is vital for the maintenance of oocyte reserve, and that a decline in ... Inhibin, which is also secreted by the corpus luteum, contributes to FSH inhibition. The endocrine system coincides with the ... Following ovulation, LH stimulates the formation of the corpus luteum. Estrogen has since dropped to negative stimulatory ...
The corpus luteum secretes progesterone. Depending on breed, on average, 16% of mares have double ovulations, allowing them to ... Exercise in excessively high temperatures has been suggested as being detrimental to pregnancy maintenance during the embryonic ... It decreases 12-15 days after ovulation, when the corpus luteum begins to decrease in size. Prostaglandin: secreted by the ... causes luteolysis and prevents the corpus luteum from secreting progesterone eCG - equine chorionic gonadotropin - also called ...
Endocrinology of reproduction
Zeleznik, A., Fairchild Benyo, D. Control of follicular development, corpus luteum function and the recognition of pregnancy in ... crucial for the maintenance of the endometrium. hCG secreted by cytotrophoblastic cells of the blastocyst controls endometrial ... The dramatic increase in trophoblastic and corpus luteal hCG synthesis signals both blastocyst and corpus luteal production of ... The role of lipoproteins in the regulation of progesterone secretion by the human corpus luteum. Fertil Steril, 38, 303-311 ...
... is synthesized by corpora lutea of several species, including ruminants and primates. Along with estrogen, it is ... Oxytocin is involved in the initiation of maternal behavior, not its maintenance; for example, it is higher in mothers after ... including in females in the corpus luteum and the placenta ; in males in the testicles' interstitial cells of Leydig; and in ... "Post-translational processing of oxytocin-neurophysin prohormone in the ovine corpus luteum: activity of peptidyl glycine alpha ...
Epigenetics of human development
Paraspeckles form a significant portion of the corpus luteum of the ovary; in Neat1 impaired mice, corpus luteum formation is ... PRC2 has been shown in many experiments to be necessary for the proper formation of organs, starting with the maintenance of ... 2014), "The lncRNA Neat1 is required for corpus luteum formation and the establishment of pregnancy in a subpopulation of mice ...
... seeing how BsT has a stimulatory effect of Progesterone on the corpus luteum. Though approved by the FDA in 1993, rBST has been ... This is due to a lower milk yield per cow due to the pasture-based system which is attributed with a greater maintenance energy ... Overall, milk and dairy products provide essential nutrients and related benefits in health maintenance and the prevention of ...
The hormones produced by the corpus luteum also suppress production of the FSH and LH that the corpus luteum needs to maintain ... "Prolactin response to suckling and maintenance of postpartum amenorrhea among intensively breastfeeding Nepali women". Endocr. ... which is very similar to LH and which preserves the corpus luteum. The corpus luteum can then continue to secrete progesterone ... The loss of the corpus luteum is prevented by fertilization of the egg. The syncytiotrophoblast, which is the outer layer of ...
Mather Air Force Base
one example of a native wildflower found here is the yellow mariposa lily, Calochortus luteus. Another example is the Vernal ... In 1976, following the decommissioning of Training Squadron Twenty-Nine (VT-29) at Naval Air Station Corpus Christi, Texas, the ... Dozens of wooden buildings served as headquarters, maintenance, and officers' quarters. Enlisted men had to bivouac in tents. ... Yellow Mariposa Lily: Calochortus luteus, GlobalTwitcher.com, ed. N. Stromberg Archived 4 October 2011 at the Wayback Machine. ...
Evidence suggests the insulin-like growth factor (IGF) system may be involved in luteal maintenance and regression. However, previous studies have only investigated a few components of the system, primarily in bovine and ...
TY - JOUR. T1 - Histologische und hormonelle Untersuchungen am Corpus luteum des Rindes.. AU - Okuda, Kiyoshi. PY - 1984. Y1 - 1984. M3 - Article. VL - 19. SP - 169. EP - 181. JO - Zuchthygiene. JF - Zuchthygiene. ER - ...
Thus, it turns out that the corpus luteum in the ovary is formed in the body of a woman every month, and every month resolved.Its perfectly normal to experience and because of this is meaningless.However, there is a likelihood that in case of pregnancy, the corpus luteum does not resolve, and continue to produce progesterone, or after pregnancy the corpus luteum will continue to grow.In this case we speak of the corpus luteum cyst.. cystic corpus luteum usually has a larger than usual size.In this case, the symptoms are the same as during pregnancy: delayed menstruation, nagging feeling in the stomach, its all a result of the work of the hormone.However, pregnancy test gives a negative result.However, most of this state and is not at risk, even during pregnancy.. However, a cyst could still be a problem, if it is too large.In this case, the cyst may burst as a result of mechanical action.For example, if a large impact or physical exertion.And it is internal bleeding, ie the state, threatening ...
Corpus luteum cysts could be agonizing and might set off alterations in menstrual bleeding. Generally this type of cyst will dissolve on its own personalized inside of of various months of forming. At other situations, nonetheless, these are in a position to expand becoming rather substantial and heavy. The fat in the cyst may well trigger the ovary to increase for being twisted. A twisted ovary is incredibly agonizing and may phone for well-being-related consideration. And it actually is this ache that typically leads females to look for out the support of their health care medical doctor ...
The corpus luteum (plural: corpora lutea) is a temporary endocrine structure involved in ovulation and early pregnancy. During ovulation, the primary follicle forms the secondary follicle and subsequently the mature vesicular follicle. At ovula...
As the blood is resorbed, a solid Corpus Luteum is formed by proliferation of granulosa and theca intera cells as well as blood vessels. This remains on the surface of the ovary ...
As the blood is resorbed, a solid Corpus Luteum is formed by proliferation of granulosa and theca intera cells as well as blood vessels. This remains on the surface of the ovary ...
A Corpus luteum cyst is a type of ovarian cyst which may rupture about the time of menstruation, and take up to three months to disappear entirely. A corpus luteum cyst rarely occurs at age 50+, because eggs are no longer being released in menopausal women. Corpus luteum cysts may contain blood and other fluids. The physical shape of a corpus luteum cyst may appear as an enlargement of the ovary itself, rather than a distinct mass -like growth on the surface of the ovary. This type of functional cyst occurs after an egg has been released from a follicle. The follicle then becomes a secretory gland that is known as the corpus luteum. The ruptured follicle begins producing large quantities of estrogen and progesterone in preparation for conception. If a pregnancy doesnt occur, the corpus luteum usually breaks down and disappears. It may, however, fill with fluid or blood, causing the corpus luteum to expand into a cyst, and stay in the ovary. Usually, this cyst is on only one side, and does not ...
Define corpus luteum hormone. corpus luteum hormone synonyms, corpus luteum hormone pronunciation, corpus luteum hormone translation, English dictionary definition of corpus luteum hormone. n another name for progesterone
Looking for online definition of corpora lutea in the Medical Dictionary? corpora lutea explanation free. What is corpora lutea? Meaning of corpora lutea medical term. What does corpora lutea mean?
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Sexual Structures - a luteal phase(presence of the corpus luteum These cyclic phases are interrupted only by pregnancy and...
View Notes - Sexual Structures from BIO BSC1010 at Broward College. a luteal phase (presence of the corpus luteum ). These cyclic phases are interrupted only by pregnancy and continue until
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TY - JOUR. T1 - The function and regulation of the primate corpus luteum during the fertile menstrual cycle.. AU - Stouffer, Richard. AU - Ottobre, J. S.. AU - Molskness, T. A.. AU - Zelinski, Mary. PY - 1989. Y1 - 1989. N2 - Figure 2 summarizes the changes in endocrine function and the factors which regulate the primate corpus luteum during the fertile menstrual cycle. The classical luteotropic role of LH during the menstrual cycle is superceded by CG at or before the time of implantation. The role of local factors in modulating luteal function is an area of continued research, as some factors are deemed less important (i.e., estrogen, at least prior to luteal rescue) and other possibilities (progesterone, prostaglandins, and relaxin) arise. The role of local factors has not yet been studied in the corpus luteum following its rescue in early pregnancy. Finally, it is apparent that a different type of "shift" precedes the recognized luteal-placental shift in early pregnancy, when the corpus ...
Marsh, Karen; Sliney, Kyle; La Barbera, Andrew R. (University of Cincinnati. College of Medicine; University of Cincinnati, 2007-02-06) ...
Corpus Albicans Definition - A corpus albicans is a mass of white scar tissue in the ovary that is formed after the degeneration of the corpus luteum...
Polütsüstilised munasarjad ehk munasarjade polütsüstiline haigus (lühend PCO) - munasarjad on mahult suurenenud ja sisaldavad arvukalt perifeerselt paiknevaid tsüste, mille suurus võib ulatuda kuni 8 millimeetrini. Tsüstide näol on tegemist lõpuni küpsemata folliikulitega (munarakualged). PCOSi kandvad naised ongi sageli viljatud tulenevalt sellest, et munarakk ei ole lõpuni arenenud, ei teki ovulatsiooni (munarakk ei vabane) ning ei moodustu kollakeha (corpus luteum).  Polütsüstilised munasarjad tekivad, kui munasarjad on mingil põhjusel hakanud tootma ülemäärast kogust androgeene (meessuguhormoone), eelkõige testosterooni, mille põhjuseks võivad olla kas hüpofüüsi poolt toodetud liigne luteiniseeriv hormoon (LH) või liigne insuliin veres (hüperinsulineemia), naiste hulgas, kelle munasarjad on tundlikud liigsele insuliinile.    ...
Menstru ci s zavarok s vagy medd s g luteum praemenstruati s syndroma oedema-k pz d s fejf j s sz kreked s psych s fibrocyst s mastopathia.
Looking for online definition of corpus luteum hematoma in the Medical Dictionary? corpus luteum hematoma explanation free. What is corpus luteum hematoma? Meaning of corpus luteum hematoma medical term. What does corpus luteum hematoma mean?
The functions of the Corpus luteum. V.-Changes in the sterile horn during pregnancy, and their relation to changes in the...
Evidence as to the precise role of the corpus luteum during pregnancy is contradictory, especially when different species are compared. Most observers agree that the presence of the corpus luteum is necessary during the early stages of gestation. During the second half of pregnancy, however, the removal of the corpus luteum in certain animals does not lead to immediate abortion. In the guinea-pig Loeb and Hesselberg (1917), Herrick (1928) and Courrier, Kehl and Raynaud (1929) have found that pregnancy may continue for some weeks after double ovariectomy, and Ash-Upmark (1926) has listed a large number of clinical cases in which ovariectomy in women has not disturbed pregnancy. The evidence for the rabbit (summarised by Hammond, 1925), is slightly contradictory, but tends to show that the corpus luteum is necessary during the whole of pregnancy, although this was not the conclusion of Niskoubina (1909). In the rat it appears that double ovariectomy towards the end of pregnancy does not always ...
KAKEN - Research Projects | Study on the mechanisms of corpus luteum disappearance during luteolysis (KAKENHI-PROJECT-25660212)
Principal Investigator：OKUDA Kiyoshi, Project Period (FY)：2013-04-01 - 2015-03-31, Research Category：Grant-in-Aid for Challenging Exploratory Research, Research Field：Animal production science
A modified superfusion technique is described with which it was demonstrated that the action of gonadotrophin on progesterone secretion by pig corpus luteum tissue is twofold, in that it first stimulates the rapid release of progesterone (either performed or partially synthesized), which is followed by prolonged synthesis of the steroid de novo from acetate.. ...
Fraenkel, Dieses Archiv. Bd. 68, 91. Zeitschr. f. Geburtsh. und Gynäk. Bd. 64. Zentralbl. f. Gyn. 1911. Nr. 46.Google Scholar ...
Immuno-endocrine mechanisms connected with the creation of corpora lutea persistent in animal ovaries - Polish Journal of...
Tytuł projektu: Rozbudowa i przekształcenie bibliograficznej bazy danych AGRO w bazę bibliograficzno-abstraktową z wykorzystaniem oprogramowania YADDA. Nr umowy: POIG 02.03.02-00-031/09 (okres realizacji 2009-2013 ...
A hormone produced by the corpus luteum that prepares a uterus for the impanation of fertilized ovum, maintains pregnancy and also promotes development of the mammary glands.
Immunocontraception - Wikipedia
"The significance of the human corpus luteum in pregnancy maintenance". Am J Obstet Gynecol. 112: 1061-1067. Nash, H; ED ... The main function of hCG is to sustain the ovarian corpus luteum during pregnancy past the time it would normally decay as part ... For the first 7-9 weeks in humans, the corpus luteum secretes the progesterone necessary to maintain the viability of the ...https://en.wikipedia.org/wiki/Immunocontraception
DiVA - Search result
Relaxin secreted during both phases suggests that the corpus luteum is not the only source of relaxin in nonpregnant women, as ... Reliability and Maintenance. *Tribology (Interacting Surfaces including Friction, Lubrication and Wear). *Vehicle Engineering ... Our data indicate the existence of sources for relaxin production other than the corpus luteum in the non-pregnant woman. ...http://uu.diva-portal.org/smash/resultList.jsf?p=351&fs=false&language=en&searchType=ORGANISATION&query=&af=%5B%5D&aq=%5B%5B%7B%22organisationId%22%3A%221329%22%7D%5D%5D&aq2=%5B%5B%5D%5D&aqe=%5B%5D&noOfRows=50&sortOrder=author_sort_asc&sortOrder2=title_sort_asc&onlyFullText=false&sf=all
Embryo Mortality Around the Period of Maintenance of the Corpus Luteum Causes Alterations to the Ovarian Function of Lactating...
Embryo Mortality Around the Period of Maintenance of the Corpus Luteum Causes Alterations to the Ovarian Function of Lactating ... Objectives were to identify cows with embryo mortality (EM) around the period of corpus luteum maintenance by interferon tau ( ... patterns and PSPB concentrations is a reasonable method to determine EM around the period of corpus luteum maintenance by IFNT ...https://insights.ovid.com/biorep/201611000/00001677-201611000-00020
Gonadotropin versus steroid regulation of the corpus luteum of the rhesus monkey during simulated early pregnancy<...
... and maintenance of the developed corpus luteum. To determine whether progesterone is an important local factor in the ability ... and maintenance of the developed corpus luteum. To determine whether progesterone is an important local factor in the ability ... and maintenance of the developed corpus luteum. To determine whether progesterone is an important local factor in the ability ... and maintenance of the developed corpus luteum. To determine whether progesterone is an important local factor in the ability ...https://ohsu.pure.elsevier.com/en/publications/gonadotropin-versus-steroid-regulation-of-the-corpus-luteum-of-th-2
Chapter 12: Dynamics of ovarian function: the corpus luteum. - Free Online Library
by Reproductive Physiology of Mammals, From Farm to Field and Beyond; Science and technology, general Corpus luteum ... Maintenance of the Corpus Luteum In addition to playing an important role in development of the CL, LH is crucial to the ... regulation of corpus luteum function, and 3) regression of the corpus luteum. DEVELOPMENT OF THE CORPUS LUTEUM The process by ... REGRESSION OF THE CORPUS LUTEUM The regression of the corpus luteum which marks the end of the luteal phase is commonly ...https://www.thefreelibrary.com/Chapter+12%3A+Dynamics+of+ovarian+function%3A+the+corpus+luteum.-a0192485729
Luteal Phase Dysfunction: Background, Pathophysiology, Epidemiology
The significance of the human corpus luteum in pregnancy maintenance. I. Preliminary studies. Am J Obstet Gynecol. 1972 Apr 15 ... Because the corpus luteum is not a de novo structure but is a direct result of the follicle, it shows the effects of abnormal ... If pregnancy occurs, the production of progesterone from the corpus luteum continues for 7 weeks because of the tonic release ... Following ovulation, the mature ovarian follicle forms the corpus luteum, which becomes a blood-filled structure that allows ...https://emedicine.medscape.com/article/254934-overview
Progesterone pretreatment has a direct effect on GnRH-induced preovulatory follicles to determine their ability to develop into...
1, 8/8 progesterone-primed ewes ovulated and produced functionally normal corpora lutea compared with 2/9 non-primed ewes. ... Maintenance or regression of the corpus luteum during multiple decisive periods of bovine pregnancy. *Milo C Wiltbank, Rina ... Ram-induced short luteal phases: effects of hysterectomy and cellular composition of the corpus luteum.. *Philippe Chemineau, ... Role of the uterus in early regression of corpora lutea induced by the ram effect in seasonally anoestrous Barbarine ewes.. * ...https://www.semanticscholar.org/paper/Progesterone-pretreatment-has-a-direct-effect-on-to-Hunter-Southee/59ad98fd4450f321dfa2151b83395b5c92048aba
Human Embryogenesis: Weeks 1-3 of Prenatal Development Flashcards by Joel Glotfelty | Brainscape
Induces the corpus luteum to continue secretion of progesterone for endometrium maintenance. -Secreted by trophoblasts ... If pregnancy occurs, the corpus luteum is maintained for a period by ...https://www.brainscape.com/flashcards/human-embryogenesis-weeks-1-3-of-prenatal-5382142/packs/7943499
Eastern New Mexico University
Secretion of progesterone by the corpus luteum is necessary for the maintenance of pregnancy. It has also been well documented ... to be the luteolytic hormone that causes regression of the corpus luteum. ... Gene Expression and Proliferation Rates of Corpus Luteal Cells. *Enhancing Career Awareness and Development Through ... Gene Expression and Proliferation Rates of Corpus Luteal Cells. Previous research shows cows treated with insulin have ...https://www.enmu.edu/component/content/article/116-academics/education-technology/family-consumer-sciences-agriculture/983-arnl-areas-of-research?Itemid=101
Hormone - Hormones of the reproductive system | Britannica.com
... the corpus luteum is no longer needed for the maintenance of pregnancy. Much of the estrogen, although synthesized in the ... The corpus luteum continues to function during pregnancy, supplemented (in eutherian, or placental, mammals but not in ... Some progesterone is probably formed in the ovarian follicle, but the main site of production is the corpus luteum, which is ... In these last four species and in others like them, in which the placenta cannot substitute completely for the corpus luteum, ...https://www.britannica.com/science/hormone/Hormones-of-the-reproductive-system
veterinary nonpregnant female reproduction - cueFlash - Learn by studying flashcards
5.maintenance of corpus luteum gonadotropin pulses change in amplitude and frequency during luteal phase and follicular phase ... from the corpus. luteum stimulates. uterine PGF release CL life-span can be prolonged by: ⬢ Pregnancy. ⬢ Pregnancy loss after ... regress the corpus luteum in the. ipsilateral ovary only SYSTEMIC PGF TRANSFER ⬢ PGF is secreted into the general. circulation ... Period of functional corpus luteum. ⬢ Not sexually receptive (no mounting). ⬢ Duration - 16 days. ⬢ Progesterone - high CATTLE ...https://cueflash.com/decks/tag/female/82515/veterinary_nonpregnant_female_reproduction
Methods for Diagnosis and Monitoring of Pregnancy in Dairy Cattle and their Implementation - eXtension
Progesterone produced by the corpus luteum is required for maintenance of pregnancy in cattle. Because normally cycling cows ... produced by the embryo disrupts the luteolytic PGF2α release from the uterine endometrium to maintain the corpus luteum and ...https://articles.extension.org/pages/11200/methods-for-diagnosis-and-monitoring-of-pregnancy-in-dairy-cattle-and-their-implementation
Taniguchi H[au] - PubMed - NCBI
Possible Mechanisms for Maintenance and Regression of Corpus Luteum Through the Ubiquitin-Proteasome and Autophagy System ... VISTA Is Crucial for Corneal Allograft Survival and Maintenance of Immune Privilege. ...https://www.ncbi.nlm.nih.gov/pubmed?cmd=search&term=Taniguchi+H%5Bau%5D&dispmax=50
Ovulation 101: What is it & how does it work? - Clued In - Medium
Csapo AI, Pulkkinen M. INDISPENSABILITY OF THE HUMAN CORPUS LUTEUM IN THE MAINTENANCE OF EARLY PREGNANCY LUTEECTOMY EVIDENCE. ... is called the corpus luteum, or "yellow body" in latin (because its yellowish in color). A new corpus luteum is made every ... the corpus luteum begins to degrade, and hormone levels drop, triggering your period (20). If a pregnancy does happen, the ... corpus luteum provides enough progesterone for your pregnancy to develop, until the placenta can take over (21). ...https://medium.com/clued-in/ovulation-101-what-is-it-how-does-it-work-aca52fb93f31?source=collection_home---4------15-----------------------
Pseudopregnancy - Wikipedia
The hormone prolactin produced regulates the activation and early maintenance of corpus luteum. The corpus luteum is known as a ... In most species, the corpus luteum is degraded in the absence of a pregnancy. However, in some species, the corpus luteum may ... and instead the corpus luteum persists regardless of pregnancy. Since the corpus luteum is not degraded, it will cause the ... meaning that they will only ovulate and produce a corpus luteum if they are bred. The corpus luteum persists as if the queen ...https://en.wikipedia.org/wiki/Pseudopregnancy
Progesterone secretion and mitochondrial size of aging porcine corpora lutea.
The corpora lutea are required for the maintenance of pregnancy; ovariectomy any time results in abortion within 36 hr (du ... Size of mitochondria in aging porcine corpora lutea PROGESTERONE AND MITOCHONDRIA IN CORPORA LUTEA by that time. Sequential ... After mating of gilts, the corpora lutea develop, and they are required for the maintenance of pregnancy t o a normal duration ... nongravid gilts results in persistence of the corpora lutea to 150 days. We report that these corpora secrete greater ...https://www.docme.ru/doc/2169996/progesterone-secretion-and-mitochondrial-size-of-aging-po..
978. Zearalenone (WHO Food Additives Series 44)
Increased plasma concentrations of progesterone and prolonged maintenance of corpora lutea were observed in the gilts with ... The corpora lutea regressed when zearalenone was withdrawn from the diet (Edwards et al., 1987a). The frequency of pregnancy ... Eight months after treatment, 25 of 34 treated mice and 3 of 33 control mice had no corpora lutea. Treated mice also had dense ... All animals were killed with carbon monoxide on day 22 after mating and the numbers of corpora lutea and fetuses and fetal ...http://www.inchem.org/documents/jecfa/jecmono/v44jec14.htm
978. Zearalenone (WHO Food Additives Series 44)
Increased plasma concentrations of progesterone and prolonged maintenance of corpora lutea were observed in the gilts with ... The corpora lutea regressed when zearalenone was withdrawn from the diet (Edwards et al., 1987a). The frequency of pregnancy ... Eight months after treatment, 25 of 34 treated mice and 3 of 33 control mice had no corpora lutea. Treated mice also had dense ... All animals were killed with carbon monoxide on day 22 after mating and the numbers of corpora lutea and fetuses and fetal ...http://inchem.org/documents/jecfa/jecmono/v44jec14.htm
Mallotus philippinensis Muell. Arg (Euphorbiaceae): Ethnopharmacology and Phytochemistry Review
... corpus luteum formation, estrus cycle, and maintenance of pregnancy in rats . This antifertility effect of plant extract is ... Colchicum luteum (rhizome and seed), Hedychium spicatum (rhizome), and Heradeum candicans (rhizome) . ... Micrococcus Luteus, Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, Klebsiella pneumonia, Candida albicans ...https://www.hindawi.com/journals/bmri/2014/213973/
Society of Family Planning: SFP research grant awards-Alison Edelman, 2007
Studies have shown that prostaglandins appear to play a critical role in ovulation and maintenance of the corpus luteum. Thus ...https://www.societyfp.org/Research-and-grants/Abstracts/Alison-Edelman-2007.aspx?lnkId=736
Animal reproductive system - Female systems | Britannica.com
Corpora lutea produce the hormone progesterone, which is essential for the maintenance of pregnancy. The conversion of ... The result in mammals is the formation of solid masses called corpora lutea, recognizable as prominent reddish-yellow bulges on ... In birds, the postovulatory follicle shrinks, and identifiable corpora lutea do not develop, although some granulosa cells ... because the granulosa cells swell and multiply to form corpora lutea, masses of yellow tissue. In the bat Myotis the antrum is ...https://www.britannica.com/science/animal-reproductive-system/Female-systems
Free MCAT Flashcards about MCAT-Hormones
Promotes growth/maintenance of endometrium. Released by corpus luteum. stimulates the uterus to prepare for pregnancy. ...https://www.studystack.com/flashcard-373132
Hypothalamus IV Flashcards by Sara S | Brainscape
progesterone for maintenance of pregnancy. LH required for continued devolopment of corpora lutea. ...https://www.brainscape.com/flashcards/hypothalamus-iv-1252183/packs/2357522
RRB NTPC EXAM -2016: Biology: Functions Of Major endocrine glands and other organs - ssc-ibps.com -SSC CGL...
... development of uterus Foetal development Placenta Chorionic gonadotrophin Human placental lactogen Maintenance of corpus luteum ... inhibition of ovulation Corpus luteum Progesterone and oestrogen Progesterone ans oestrogen Growth and ... ovulation and maintenance of corpus luteum Stimulates milk production and secretion Synthesis and secretion of thyroid hormones ... In female secretion of oestrogen and progesterone, ovulation and maintenance of corpus luteum. Stimulates milk production and ...http://www.ssc-ibps.com/2016/02/rrb-ntpc-exam-2016-biology-functions-of.html
KMLE: ?? (Harrison) ?? ??
LH : ovulation & corpus luteum maintenance???? 2) FSH: seminiferous tuule development ???? spermatogenesis ???? LH: Leydig cell ...http://www.kmle.co.kr/harrisonview.php?m=%B6%F3%BD%C4&view=133+%B3%BB%BA%D0%B1%E2+%B3%BB%B0%FA+-+Gonadotropins+FSH+%26+LH%28%BB%FD%BD%C4%BB%F9%C0%DA%B1%D8%C8%A3%B8%A3%B8%F3%29.htm
- 1984). Although the normal duration of the estrous cycle is about 21 days in the pig, the corpora lutea secrete progesterone and small amounts of relaxin (Masuda et al. (docme.ru)
- If the ovum is fertilized, it becomes embedded in the endometrium (implantation), the corpus luteum remains to secrete progesterone which helps the embryo to grow with in the uterus. (theholisticcare.com)
- Presumably, progesterone prepares the endometrium for implantation and maintenance of a pregnancy. (medscape.com)
- Promotes growth/maintenance of endometrium. (studystack.com)
- After the oocyte is released, the increased levels of LH control the luteinization - the development of the corpus luteum, which produces progesterone and estradiol in response to the pulsatile LH secretion and, thus, the second phase of the menstrual cycle is maintained and the endometrium (the inner lining of the uterus) prepares for the possible implantation of the zygote and future pregnancy. (medigoo.com)
- Corpus luteum mainly secretes progesterone - the main hormone affecting the endometrium in the luteal phase, creating good conditions for embryo implantation. (thanhniennews.com)
- Progesterone secretion and mitochondrial size of aging porcine corpora lutea. (docme.ru)
- THE ANATOMICAL RECORD 223:252-256 (1989) Progesterone Secretion and Mitochondria1Size of Aging Porcine Corpora Lutea VALERIE ADAIR, MARVIN H. STROMER, AND LLOYD L. ANDERSON Department of Animal Science, Iowa State University, Ames, Iowa 50011 ABSTRACT A functional dependency between the nongravid uterus and the ovaries is essential to luteolysis and the return to estrus in the pig. (docme.ru)
- Progesterone secretion and mitochondria1 features suggest that porcine corpora lutea seem genetically controlled and are preprogrammed at estrus for the duration of pregnancy, regardless of the presence of conceptuses or absence of the uterus. (docme.ru)
- 1986). The ephemeral nature of mammalian corpora lutea can be characterized by their autonomy of progesterone secretion, responsiveness to the luteolytic effects of prostaglandins, and their ability t o make prostaglandins (Anderson et al. (docme.ru)
- Rothchild, 1981).We describe sequential profiles of progesterone secretion into peripheral blood during periods exceeding the normal life span of the corpora lutea in 0 1989 ALAN R. LISS, INC. hysterectomized gilts, as compared with pregnant and lactating animals, as well as the fine structure of mitochondria in aging IuteaI cells. (docme.ru)
- Limited research suggests that progesterone secretion is similar in pregnant and non-pregnant female dog, so veterinary researchers hypothesize that they may not require molecular factors from the embryo for maternal recognition of pregnancy, and instead the corpus luteum persists regardless of pregnancy. (wikipedia.org)
- Lutropin is responsible for the corpus luteum formation and secretion of progesterone. (medigoo.com)
- Describe the mechanisms regulating formation, maintenance, and regression of the corpus luteum. (thefreelibrary.com)
- Concentrations of progesterone in blood parallel the growth and regression of the corpus luteum (Figure 12-2). (thefreelibrary.com)
- The luteal phase of the ovarian cycle is defined as the period between ovulation and regression of the corpus luteum. (thefreelibrary.com)
- Possible Mechanisms for Maintenance and Regression of Corpus Luteum Through the Ubiquitin-Proteasome and Autophagy System Regulated by Transcriptional Factors. (nih.gov)
- During the nonconceptive cycle in primates, progesterone is a likely intermediary for several LH-dependent events in the ovary including ovulation, luteinization of the follicle wall, and maintenance of the developed corpus luteum. (elsevier.com)
- Following ovulation, the mature ovarian follicle forms the corpus luteum, which becomes a blood-filled structure that allows the precursor cholesterol to be obtained, initiating steroidogenesis and resulting in progesterone production. (medscape.com)
- Because the corpus luteum is not a de novo structure but is a direct result of the follicle, it shows the effects of abnormal folliculogenesis with decreased progesterone production. (medscape.com)
- The corpus luteum (the remains of an ovulated ovarian follicle) is responsible for the development of maternal behavior and lactation, which are mediated by the continued production of progesterone by the corpus luteum through some or all of pregnancy. (wikipedia.org)
- LH brings about ovulation and changes the graphian follicle into a corpus luteum. (theholisticcare.com)
- Ram-induced short luteal phases: effects of hysterectomy and cellular composition of the corpus luteum. (semanticscholar.org)
- Hysterectomy of luteal phase (day 6) nongravid gilts results in persistence of the corpora lutea to 150 days. (docme.ru)
- Progesterone and relaxin are produced by porcine corpora lutea during pregnancy and after hysterectomy (Belt et al. (docme.ru)
- However, in some species, the corpus luteum may persist in the absence of pregnancy and cause "pseudopregnancy", in which the female will exhibit clinical signs of pregnancy. (wikipedia.org)
- Since the corpus luteum is not degraded, it will cause the development of maternal characteristics in the absence of pregnancy. (wikipedia.org)
- In the absence of pregnancy, corpus luteum stops secreting progesterone, anterior pituitary starts secreting FSH again, and the cycle is repeated. (theholisticcare.com)
- Describe the structural and hormonal changes exhibited by the corpus luteum during the luteal phase. (thefreelibrary.com)
- The corpus luteum is fully functional by the time of diestrus, but it continues to increase in size throughout the luteal phase, releasing increasing amounts of progesterone as it grows. (thefreelibrary.com)
- Whereas the follicular phase of the menstrual cycle can vary in length, the secretory phase lasts approximately 14 days, correlating with the life span of the corpus luteum. (medscape.com)
- LH is necessary for the occurrence and maintenance of the secretory phase of the menstrual cycle which starts after the ovulation. (medigoo.com)
- This experiment provided evidence that the combination of ISG expression patterns and PSPB concentrations is a reasonable method to determine EM around the period of corpus luteum maintenance by IFNT because cows with evidence of EM had patterns of ISG expression more similar to pregnant than cyclic cows or cows with no embryo. (ovid.com)
- Progesterone pretreatment has a direct effect on GnRH-induced preovulatory follicles to determine their ability to develop into normal corpora lutea in anoestrous ewes. (semanticscholar.org)
- After mating of gilts, the corpora lutea develop, and they are required for the maintenance of pregnancy t o a normal duration of about 114 days. (docme.ru)