• Most pancreatic endocrine neoplasms discovered clinically are functional-that is, they secrete one or more hormonal products into the blood, which leads to a recognizable clinical syndrome. (medscape.com)
  • [ 11 ] Other nonfunctional pancreatic endocrine tumors likely secrete unknown products that are of little or no clinical significance. (medscape.com)
  • There are several different types which secrete the hormones secretin, cholecystokinin and several others. (wikipedia.org)
  • Pancreatic islet cell tumors may secrete 2 or more polypeptide hormones. (medscape.com)
  • The main function of the thyroid is to synthesize and secrete thyroid hormones. (teknon.es)
  • Cells found throughout the lining of the GASTROINTESTINAL TRACT that contain and secrete regulatory PEPTIDE HORMONES and/or BIOGENIC AMINES . (nih.gov)
  • In 1914, Gosset and Masson demonstrated that carcinoid tumors might arise from enterochromaffin cells (Kulchitsky cell) within glands of Lieberkühn using silver impregnation techniques. (medscape.com)
  • The cells in pancreatic endocrine neoplasms are termed amine precursor uptake and decarboxylation (APUD) cells because they have a high amine content, are capable of amine precursor uptake, and contain an amino acid decarboxylase. (medscape.com)
  • Islet cells commonly are referred to as APUD cells, a name derived from their high amine content and capacity for amine precursor uptake with decarboxylation. (medscape.com)
  • 1,2,3] They originate in amine precursor uptake and decarboxylation (APUD) cells of the gastroenteropancreatic endocrine system and in adrenal or extra-adrenal neurogenic sites. (medscape.com)
  • The detailed study of neuroendocrine cells by Pearse ( 3 , 4 ) led to the development of the concept of amine precursor uptake and decarboxylation (APUD). (basicmedicalkey.com)
  • Trk-like (A-B-C) proteins which are secreted by the cells making up the sub-population of the endocrine cells carry out the neurotrophin synthesis, amine and/or peptide storage as well as the regulation of the blood circulation of the gastrointestinal tract. (fusabil.org)
  • In 1980, the World Health Organization (WHO) applied the term carcinoid to all tumors of the diffuse endocrine system (synonymous with amine precursor uptake and decarboxylation [APUD] and neuroendocrine cell system). (medscape.com)
  • however, tumors can originate from any cell of the amine precursor uptake and decarboxylation system and, therefore, produce several intestinal hormones. (medscape.com)
  • Amine storage and function in peptide hormone-producing cells. (uni-bielefeld.de)
  • Endocrine function of bombesin regulates the secretion of gastric acid and its motility. (fusabil.org)
  • Neurotensin regulates several biological processes, such as intestinal motility, secretion, vascular smooth muscle activity, and intestinal epithelial cell proliferation, but recent evidence indicates that in neurotensin there is also a potent neuroimmunomodulator 24 . (fusabil.org)
  • Neoplasms of the endocrine pancreas can be divided into functional and nonfunctional varieties. (medscape.com)
  • Several other rare clinical syndromes have been proposed as possible functional endocrine syndromes associated with pancreatic neoplasms. (medscape.com)
  • Patients with pancreatic neoplasms that have the histologic characteristics of a pancreatic endocrine tumor but no associated elevation in plasma hormone levels (excluding the pancreatic polypeptide level) and those without a recognizable clinical syndrome are considered to have nonfunctional pancreatic endocrine tumors. (medscape.com)
  • Although the term islet cell tumor is often used to identify neoplasms of the endocrine pancreas, this is a misnomer because many pancreatic neuroendocrine tumors do not develop directly from islet cells. (medscape.com)
  • Functional pancreatic endocrine neoplasms cause physiologic derangements related to the normal action of the hormonal product that the tumors overproduce. (medscape.com)
  • Amyloid deposits are not uncommon in endocrine neoplasms and can also occur in pituitary tumors. (scirp.org)
  • The cells and neoplasms of the neuroendocrine and paracrine systems make up the DNS. (basicmedicalkey.com)
  • The principal cells and neoplasms that form the DNS are listed in Table 11.1 . (basicmedicalkey.com)
  • Secretin is a 27-amino acid peptide hormone belonging to the structurally related peptides of pituitary adenylate cyclase-activating polypeptide/glucagon superfamily 25 . (fusabil.org)
  • [ 12 ] Pearse first used the term APUD in 1968 to unify a group of functionally and structurally similar neuroendocrine cells that are present throughout the body. (medscape.com)
  • APUD cells (DNES cells) constitute a group of apparently unrelated endocrine cells, which were named by the scientist A.G.E. Pearse, who developed the APUD concept in the 1960s based on calcitonin-secreting parafollicular C cells of dog thyroid. (wikipedia.org)
  • Although the APUD concept provided a unifying theory for explaining some endocrine diseases and ectopic hormone productions, the hypothesis that the cells were all of neural crest origin, as postulated by Pearse, was later disproved by the experiments of LeDouarin ( 5 ) and others. (basicmedicalkey.com)
  • [ 2 ] Subsequently, four other classic pancreatic endocrine tumor syndromes have been described. (medscape.com)
  • They may manifest as sporadic tumors or as part of certain syndromes, including multiple endocrine neoplasia type 1 (MEN 1) and von Hippel-Lindau (VHL) disease. (medscape.com)
  • Carcinoid tumors and related syndromes may be a part of multiple endocrine neoplasia . (medscape.com)
  • [ 13 ] APUD cells were once believed to originate from the embryologic neural crest, but current evidence suggests that these cells-and thus endocrine tumors of the pancreas and other endocrine tumors of the upper gastrointestinal tract (eg, carcinoid tumors)-actually develop from the embryologic endoderm. (medscape.com)
  • [ 15 ] Instead, the tumors arise from APUD stem cells, which are pluripotential neuroendocrine cells located within the ductular epithelium of the exocrine pancreas and elsewhere in the distal foregut. (medscape.com)
  • No universally agreed-upon algorithm exists in the radiologic investigation of pancratic neuroendocrine (islet cell) tumors of the pancreas. (medscape.com)
  • Evidence has shown that endoscopic ultrasonography (EUS) can be used to accurately diagnose and localize primary endocrine tumors of the pancreas, especially insulinomas and gastrinomas. (medscape.com)
  • Feyrter ( 2 ) considered the clear cells of the gastrointestinal tract to be peripheral endocrine or paracrine cells. (basicmedicalkey.com)
  • Gastrointestinal endocrine cells are distributed in the mucosa of the gastrointestinal tract and they synthesize various kinds of gastrointestinal hormones. (fusabil.org)
  • The existence of endocrine cells has been immunohistochemically demonstrated in the gastrointestinal tract mucosa of different fish species 8 - 18 . (fusabil.org)
  • Pancreatic polypeptide (PP) is a product that appears to be a marker for pancreatic endocrine tumors, but it is not a mediator of any specific PP-related clinical syndrome. (medscape.com)
  • These cells share the common function of secreting a low molecular weight polypeptide hormone. (wikipedia.org)
  • other secreted hormones may include secreted gastrin and pancreatic polypeptide. (medscape.com)
  • Although nonfunctional islet cell tumors are not uncommon at autopsy, most islet cell tumors with clinical manifestations are functional. (medscape.com)
  • They are relatively common in prolactinomas and less common, but can occur in growth hormone (GH)―and corticotrophin (ACTH)―secreting or nonfunctional adenomas. (scirp.org)
  • The first report of a hormone-producing pancreatic tumor syndrome was published in 1927, when Wilder et al described insulinoma syndrome in a patient with a metastatic islet cell tumor who had hyperinsulinism and hypoglycemia. (medscape.com)
  • Adenohypophysis Neurons of Hypothalamus Chief Cells of Parathyroid Adrenal Medullary Cells Glomus cells in Carotid Body Melanocytes of Skin Cells of Pineal Gland Renin producing cells in the kidney Apudoma Enteroendocrine cell Neuroendocrine cell List of human cell types derived from the germ layers Boyd, C. A. R. (March 2001). (wikipedia.org)
  • The steroid-producing endocrine cells of the adrenal cortex, ovary, and testis, as well as the thyroid hormone-producing follicular cells in the thyroid gland, do not form part of the DNS. (basicmedicalkey.com)
  • These cells produce SECRETIN and are found in the MUCOSA of upper SMALL INTESTINE and PYLORIC ANTRUM in mammals. (nih.gov)
  • Secretin also has been found in cells in the BRAIN and other tissues. (nih.gov)
  • Pancreatic islet cells are part of the diffuse neuroendocrine system of the gut and pancreatic endocrine system. (medscape.com)
  • The production of somatostatin by the pancreatic islets, which regulates insulin and glucagon production in neighboring islet cells, is an example of paracrine regulation. (basicmedicalkey.com)
  • Functioning tumors produce a clinical syndrome as a result of excessive hormone production. (medscape.com)
  • Leydig Cells" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings) . (umassmed.edu)
  • Hormonal analysis revealed extremely elevated levels of serum prolactin of 4700 ng/mL (normal 4.04 - 15.2 ng/mL) and normal levels of growth hormone (GH) 1.3 ng/ml, luteinising hormone (LH) 1.72 mIU/ml, follicle stimulating hormone (FSH) 2.19 mIU/ml, free T4 6.2 mcg/dl and morning cortisol 0.63 mcg/dl. (scirp.org)
  • Anterior pituitary cells that produce GROWTH HORMONE. (wakehealth.edu)
  • The DNS consists of a wide variety of cells that are present in the central and peripheral nervous system and in many classic endocrine organs ( Table 11.1 ). (basicmedicalkey.com)
  • These cells share the ability to produce many biologically active amines, peptides, and other substances. (basicmedicalkey.com)
  • Paracrine regulation refers to the production of amines and hormones by cells that exert a local effect on the target cells by diffusion through the extracellular space. (basicmedicalkey.com)
  • The current neuroendocrine classification of cells and tumors uses immunohistochemical (IHC), ultrastructural, and molecular biologic features to define members of the DNS ( 6 , 7 and 8 ). (basicmedicalkey.com)
  • It is an autonomic disorder, independent of the action of thyroid-stimulating hormone. (teknon.es)
  • Steroid-producing cells in the interstitial tissue of the TESTIS. (umassmed.edu)
  • Islet cell tumors in this group are often multiple and malignant. (medscape.com)
  • Carcinoid tumors arise from neuroendocrine cells, which are widespread in the human body, especially in the organs derived from the primitive intestine. (medscape.com)
  • C. Wegner, G. Teuchert-Noodt, and R.R. Dawirs, "Demonstration of dopamine immunoreactivity in open and closed type endocrine cells of gerbil (Meriones unguiculatus) stomach", LIFE SCIENCES , vol. 59, 1996, pp. 1407-1413. (uni-bielefeld.de)
  • Dopamine and the regulation of cell proliferation in gerbil (Meriones unguiculatus) pyloric mucosa. (uni-bielefeld.de)
  • Wu X, Wan S, Lee MM. Key factors in the regulation of fetal and postnatal Leydig cell development. (umassmed.edu)
  • These substances may act as neurotransmitters, as true hormones, or as paracrine regulators. (basicmedicalkey.com)
  • Hormones are substances that affect and control many important functions in the body. (preparingtobecome.com)
  • Intestinal L cells are located in the MUCOSA of distal ILEUM and COLON . (nih.gov)
  • En ellos hay pliegues de variada longitud, grosor y número que comprometen la mucosa y submucosa, con glándulas de secreción mucosa y serosa a excepción de la vagina. (bvsalud.org)
  • Absence of dopamine-beta-hydroxylase in some catecholamine-containing sympathetic ganglion cells of the dog: evidence for dopaminergic autonomic neurones. (uni-bielefeld.de)
  • Clinical features of the syndrome depend on tumor cell type. (medscape.com)
  • 8] Approximately 5% of VIPomas are associated with multiple endocrine neoplasia (MEN) type 1 syndrome. (medscape.com)
  • Neural crest cells are precursors of APUDoma and neurogenic cells. (medscape.com)
  • Microscopy: Hematoxylin and eosin staining revealed a monotonous population of round to polygonal tumor cells with round to oval nuclei and variable amounts of eosinophilic cytoplasm. (scirp.org)
  • When their protective barriers are missing, hormones and cells that are present during inflammatory processes induce activation of clasts which, when unbalanced, no longer perform physiological bone remodeling and begin to provoke an immunopathological response that causes dental resorption. (bvsalud.org)
  • Wu X, Arumugam R, Baker SP, Lee MM. Pubertal and adult Leydig cell function in Mullerian inhibiting substance-deficient mice. (umassmed.edu)
  • A repeat surgery was done for total excision and on further follow up the patient was asymptomatic with normal prolactin and other hormone levels but persistent diminished vision. (scirp.org)