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14-September-2008 18:02:48 - Motilin Motilin/ghrelin Identifiers Symbol Motilin_ghrelin Pfam PF04644 InterPro IPR006738 SCOP 1lbj OPM family 154 OPM protein 1lbj Available PDB structures: 1lbjA:27-47 1p7xA:24-51 Motilin Identifiers Symbol MLN Entrez 4295 HUGO 7141 OMIM 158270 RefSeq NM_001040109 UniProt P12872 Other data Locus Chr. 6 p21.3-p21.2 Motilin is a polypeptide hormone secreted by M cells of the small intestine that increases the migrating myoelectric complex component of gastrointestinal motility and stimulates the production of pepsin. Control of motilin secretion is largely unknown, although some studies suggest that an alkaline pH in the duodenum stimulates its release. Interestingly however, at low pH it inhibits gastric motor activity, whereas at high pH it has a stimulatory effect. Apart from in humans, motilin receptors are found in pigs', rats',cows' and cats' gastrointestinal tracts and in rabbits' central nervous systems. Contents 1 Motilin agonists 2 Related peptides 3 References 4 External links Motilin agonists Erythromycin and related antibiotics act as non-peptide motilin agonists, and are sometimes used for their ability to stimulate gastrointestinal motility. Administration of a low dose of erythromycin will induce peristalsis, which provides additional support for the conclusion that motilin secretion triggers this pattern of gastrointestinal motility, rather than results from it. However, some of erythromycin's properties, including antibiotic activity, are not appropriate for a drug designed for chronic use over a patient's lifetime. New motilin agonists are erythromycin based, however, it may be that this class of drugs becomes redundant; growth hormone secretagogue receptors share 52% of their DNA with motilin receptors and agonists of these receptors, termed ghrelins, can bring about similar effects to motilin agonists. Related peptides This domain is also found in ghrelin, a growth hormone secretagogue synthesised by endocrine cells in the stomach. Ghrelin stimulates growth hormone secretagogue receptors in the pituitary. These receptors are distinct from the growth hormone-releasing hormone receptors, and thus provide a means of controlling pituitary growth hormone release by the gastr ointestinal system1. References ^ Kangawa K, Matsuo H, Kojima M, Hosoda H 2001. Ghrelin: discovery of the natural endogenous ligand for the growth hormone secretagogue receptor. Trends Endocrinol. Metab. 12 3: 118-122. doi:10.1016/S1043-27600000362-3. PMID 11306336. External links Physiology at MCG 6/6ch2/s6ch2_26 MeSH Motilin v d e Endocrine system: hormones/endocrine glands Peptide hormones, Steroid hormones Hypothalamic-pituitary Hypothalamus: TRH, CRH , GnRH, GHRH, somatostatin, dopamine - Posterior pituitary: vasopressin, oxytocin - Anterior pituitary: α FSH, LH, TSH, GH, prolactin, POMC ACTH, MSH, endorphins, lipotropin Adrenal axis Adrenal medulla: epinephrine, norepinephrine - Adrenal cortex: aldosterone, cortisol, DHEA Thyroid axis Thyroid: thyroid hormone T3 and T4 - calcitonin - Parathyroid: PTH Gonadal axis Testis: testosterone, AMH, inhibin - Ovary: estradiol, progesterone, inhibin/activin, relaxin pregnancy Other end. glands Pancreas: glucagon, insulin, somatostatin - Pineal gland: melatonin Non-end. glands Placenta: hCG, HPL, estrogen, progesterone - Kidney: renin, EPO, calcitriol, prostaglandin - Heart atrium: ANP - Stomach: gastrin, ghrelin - Duodenum: CCK, GIP, secretin, motilin, VIP - Ileum: enteroglucagon - Adipose tissue: leptin, adiponectin, resistin - Thymus: Thymosin - Thymopoietin - Thymulin - Skeleton: Osteocalcin - Liver/other: Insulin-like growth factor IGF-1, IGF-2 Target-derived NGF, BDNF, NT-3 v d e Peptides: neuropeptides Hypothalamic Somatostatin - CRH - GnRH - GHRH - Orexins - TRH - POMC ACTH, MSH, Lipotropin Gastrointestinal hormones Cholecystokinin - Gastric inhibitory polypeptide - Gastrin - Motilin - Secretin - Vasoactive intestinal peptide Other hormones Vasopressin - Calcitonin - Other Angiotensin - Bombesin/Neuromedin B - Calcitonin gene-related peptide - Carnosine - Delta sleep-inducing peptide - FMRFamide - Galanin - Gastrin releasing peptide - Kinins Bradykinin, Tachykinins - Neuromedin B, N, U - Neuropeptide Y - Neurophysins - Neurotensin - Opioid peptide - Pancreatic polypeptide - Pituitary adenylate cyclase activating peptide v d e Hormones: gastrointestinal hormones CCK - EGF - GIP - Gastrin releasing peptide - Gastrins - Proglucagon - Motilin - Peptide YY -Prokineticin - Secretin - VIP Retrieved from http://en..org/wiki/Motilin Categories: Genes on chromosome 6 | Hormones | Digestive systemHidden category: Protein pages needing a picture Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Deutsch Español 日本語 This page was last modified on 17 August 2008, at 11:47
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