The role of colorstrum on the occurrence of immunoglobulin G subclasses and antibody production in neonatal goats. (1/731)

Quantitative determinations of IgG1 and IgG2, in one group of colostrum-fed and one group of colostrum-deprived neonatal goats revealed that the occurrence of the IgG1 subclass preceeded that of the IgG2 in both cases. In the colostrum-fed animals the IgG2 appeared, on an average, in the fourth week of life whereas in the colostrum-deprived animals the IgG2 was detected as early as three weeks after birth. At the age of twelve weeks the mean concentrations for IgG, and IgG2 were higher in the animals deprived of colostrum. The immune response to human gamma globulin was studied in colostrum-fed and colostrum-deprived neonatal goats which were immunized at birth and again after four and eight weeks. Following the first two antigen administrations a significantly higher response was obtained in the colostrum-fed neonates. However, the third injection determined a similar response in both groups. A marked suppressive effect on the immune response was observed in colostrum-fed neonatal goats when specific antibodies were present in the colostrum after preimmunization of the mothers with human gamma globulin.  (+info)

Values of three coagulation screening tests of precolostral calves. (2/731)

Prothrombin times, partial thromboplastin times and platelet counts were performed to determine normal values and to screen for coagulation defects of precolostral calves. The precolostral calves were in two groups: one group of a few calves was tested two years before the second larger group. The results for both groups were similar. The tests were performed on postcolostral calves and on mature cows to compare their values with those of precolostral calves. The mean values of prothrombin times and partial thromboplastin times of precolostral calves in the first group were 18.8 seconds and 54.8 seconds respectively. The mean values of prothrombin times and partial thromboplastin times of precolostral calves in the second group were 18.8 seconds and 50.8 seconds respectively. The mean platelet count was 422,400/cmm for the first group and 482,800/cmm for the second group.  (+info)

Fungal prophylaxis by reduction of fungal colonization by oral administration of bovine anti-Candida antibodies in bone marrow transplant recipients. (3/731)

Candida overgrowth and invasion constitute a serious threat with a high mortality in BMT recipients. Currently available topical antifungal prophylaxis is largely ineffective, and as resistance to existing, absorbable drugs for systemic use is rapidly developing, new forms of therapy are needed. We investigated the effect of oral treatment of BMT recipients with a bovine immunoglobulin product derived from animals immunized against several Candida species. The natural Candida colonization was first followed in 19 patients to establish the colonization pattern. Half of the patients were found to be colonized prior to transplantation and altogether 72% were colonized at some point during follow-up. Those with a high pre-transplant concentration of Candida in saliva (>100 CFU/ml) remained colonized throughout the BMT treatment period. The therapeutic effect was monitored in two other patient groups. The first group consisted of nine patients, where, due to a low number of primary colonized patients, response in colonized patients was suggestive of a therapeutic effect. In the second group, 10 patients with a high level of colonization (>100 CFU/ml) were given 10 g daily of the product in three divided doses. The results suggest a treatment-related reduction in Candida colonization in a majority (7/10) of patients and one patient became completely negative. As no adverse effects were noted, our findings encourage additional studies in immunocompromised, transplant patients.  (+info)

Bovine colostrum is a health food supplement which prevents NSAID induced gut damage. (4/731)

BACKGROUND: Non-steroidal anti-inflammatory drugs (NSAIDs) are effective for arthritis but cause gastrointestinal injury. Bovine colostrum is a rich source of growth factors and is marketed as a health food supplement. AIMS: To examine whether spray dried, defatted colostrum or milk preparations could reduce gastrointestinal injury caused by indomethacin. METHODS: Effects of test solutions, administered orally, were examined using an indomethacin restraint rat model of gastric damage and an indomethacin mouse model of small intestinal injury. Effects on migration of the human colonic carcinoma cell line HT-29 and rat small intestinal cell line RIE-1 were assessed using a wounded monolayer assay system (used as an in vitro model of wound repair) and effects on proliferation determined using [3H]thymidine incorporation. RESULTS: Pretreatment with 0.5 or 1 ml colostral preparation reduced gastric injury by 30% and 60% respectively in rats. A milk preparation was much less efficacious. Recombinant transforming growth factor beta added at a dose similar to that found in the colostrum preparation (12.5 ng/rat), reduced injury by about 60%. Addition of colostrum to drinking water (10% vol/vol) prevented villus shortening in the mouse model of small intestinal injury. Addition of milk preparation was ineffective. Colostrum increased proliferation and cell migration of RIE-1 and HT-29 cells. These effects were mainly due to constituents of the colostrum with molecular weights greater than 30 kDa. CONCLUSIONS: Bovine colostrum could provide a novel, inexpensive approach for the prevention and treatment of the injurious effects of NSAIDs on the gut and may also be of value for the treatment of other ulcerative conditions of the bowel.  (+info)

Two stages of increased IgA transfer during lactation in the marsupial, trichosurus vulpecula (Brushtail possum). (5/731)

The polymeric Ig receptor (pIgR) and J chain molecules are involved in the transfer of IgA across the mammary gland epithelia into milk. The J chain binds two IgA molecules to form dimeric IgA, and the pIgR transports this complex through epithelial cells. We report here the cloning of the first marsupial homologues for the pIgR and J chain from the brushtail possum. Marsupial young are born after a short gestation and are less developed than eutherian newborn. The pouch young is completely dependent on milk as its sole source of nutrition during early lactation and this phase can be considered to be equivalent to an external gestation. Two periods of increased expression of pIgR, J chain, and IgA heavy chain mRNAs were observed in the mammary gland during lactation. The first occurs for a brief period after birth of the pouch young and is likely to reflect IgA transfer via the colostrum. The second period of increased expression, which is unique to marsupials, occurs after the early lactation period and just before young exit the pouch. We propose that this represents a second colostral-like phase at the end of the external gestation.  (+info)

Ability of lactoferrin to promote the growth of Bifidobacterium spp. in vitro is independent of receptor binding capacity and iron saturation level. (6/731)

Lactoferrin (Lf) is an iron-binding protein which has been shown to inhibit the growth of various bacterial pathogens and promote the growth of anaerobic bacteria of the genus Bifidobacterium in vitro. The present study was designed to investigate whether the bifidobacteria growth promotion activity of Lf is correlated with either the binding of Lf to bifidobacterial cells or the iron saturation of Lf. Bovine Lf (bLf) from mature milk increased the growth of B. infantis and B. breve in vitro in a dose-dependent fashion, while much less growth promotion activity was found for B. bifidum. In contrast, human Lf (huLf) from mature milk promoted the growth of B. bifidum and was inactive for B. infantis and B. breve, while bLf from colostrum was devoid of bifidobacteria growth promotion activity. Changes in the iron content of Lf did not alter the bifidobacteria growth promotion activity of either bLf or huLf preparations. Competitive binding studies with biotinylated milk bLf showed that binding of bLf was inhibited by unlabelled bLf and huLf but not by beta-lactoglobulin, alpha-lactalbumin or transferrin. Binding of bLf to B. bifidum and B. breve was c. 40-fold higher than binding to Escherichia coli. Colostrum bLf was also found to bind to B. bifidum and B. breve, despite a lack of in-vitro growth promotion activity. Collectively, these results demonstrate that the ability of Lf to promote the growth of Bifidobacterium spp. in vitro is independent of the iron saturation level for Lf and suggest that binding of Lf to bifidobacteria cells may be involved but is not sufficient for stimulation of bifidobacterial growth.  (+info)

Colostral proteins from cows immunised with Streptococcus mutans/S. sobrinus support the phagocytosis and killing of mutans streptococci by human leucocytes. (7/731)

Passive immunisation, based on bovine colostral preparations, is an area of active research. Specific bovine antibodies inhibit the virulence factors of target pathogens but the interactions between whey preparations and human immune defence cells are not well known. Bovine colostrum inhibits the phagocytic activity of bovine leucocytes and this may reflect the biological activity of immunoglobulins in it. Therefore, this study aimed to examine the effects of bovine whey protein preparations from the colostrum of Streptococcus mutans/S. sobrinus-immunised and sham-immunised cows on binding, ingestion and killing of these bacteria by human leucocytes. Binding and ingestion of FITC-labelled bacteria were estimated by flow cytometry and leukocyte activation was measured as chemiluminescence. Killing rate was estimated by plate counting and by measuring bioluminescence from S. mutans- containing the insect luciferase gene. Colostral whey protein preparation from hyperimmunised cows activated human leucocytes by opsonising specific bacteria. Neutrophils, eosinophils and monocytes weakly phagocytosed non-opsonised bacteria and bacteria opsonised with control product. On the contrary, binding and ingestion were efficient in the presence of the preparation from immunised cows. Thus, these results show that bovine colostral whey proteins are able to support the activation of human phagocytes against pathogenic microbes and that this property is related to specific antibodies in whey preparations. These whey proteins may also be clinically useful, especially in preventing the colonisation of newly erupted teeth by mutans streptococci.  (+info)

Apelin, the natural ligand of the orphan receptor APJ, is abundantly secreted in the colostrum. (8/731)

By using a strategy that we have developed to search for the ligands of orphan seven-transmembrane-domain receptors [S. Hinuma et al., Nature 393 (1998) 272-276], we have recently identified a natural ligand, apelin, for the orphan 7TMR, APJ [K. Tatemoto et al., Biochem. Biophys. Res. Commun. 251 (1998) 471-476]. In this paper, we isolated rat and mouse apelin cDNAs, and analyzed the tissue distribution of apelin mRNA in rats. Although apelin mRNA was widely detected in a variety of tissues, the highest expression of apelin mRNA was detected in the mammary gland of pregnant rats. In the mammary gland, biologically active apelin and its mRNA considerably increased during pregnancy and lactation, and reached a maximal level around parturition. Moreover, a large amount of apelin (14-93 pmol/ml) was found to be secreted in the bovine colostrum, and it was still detectable even in commercial bovine milk. Since apelin partially suppressed cytokine production by mouse spleen cells in response to T cell receptor/CD3 cross-linking, the oral intake of apelin in the colostrum and milk might modulate immune responses in neonates.  (+info)

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10