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Somatostatin (also known as growth hormone inhibiting hormone (GHIH) or somatotropin release-inhibiting factor (SRIF)) is a peptide hormone that regulates the endocrine system and affects neurotransmission and cell proliferation via interaction with G-protein-coupled somatostatin receptors and inhibition of the release of numerous secondary hormones.
Somatostatin has two active forms produced by alternative cleavage of a single preproprotein: one of 14 amino acids, the other of 28 amino acids.[1]
Production
Digestive system
Somatostatin is secreted in several locations in the digestive system:
Brain
Somatostatin is produced by neuroendocrine neurons of the periventricular nucleus of the hypothalamus. These neurons project to the median eminence, where somatostatin is released from neurosecretory nerve endings into the hypothalamo-hypophysial portal circulation. These blood vessels carry somatostatin to the anterior pituitary gland, where somatostatin inhibits the secretion of growth hormone from somatotrope cells. The somatostatin neurons in the periventricular nucleus mediate negative feedback effects of growth hormone on its own release; the somatostatin neurons respond to high circulating concentrations of growth hormone and somatomedins by increasing the release of somatostatin, so reducing the rate of secretion of growth hormone.
Somatostatin is also produced by several other populations that project centrally - i.e. to other areas of the brain, and somatostatin receptors are expressed at many different sites in the brain. In particular, there are populations of somatostatin neurons in the arcuate nucleus, the hippocampus and the brainstem nucleus of the solitary tract.
Actions
D cell is visible at upper right, and somatostatinis represented by middle arrow pointing left
Somatostatin is classified as an inhibitory hormone,[1] whose actions are spread to different parts of the body:
Anterior pituitary
In the anterior pituitary gland, the effects of somatostatin are:
Gastrointestinal system
- Somatostatin suppresses the release of gastrointestinal hormones
- Lowers the rate of gastric emptying, and reduces smooth muscle contractions and blood flow within the intestine[3]
- Suppresses the release of pancreatic hormones
- Suppresses the exocrine secretory action of pancreas.
Synthetic substitutes
Octreotide (brand name Sandostatin, Novartis Pharmaceuticals) is an octopeptide that mimics natural somatostatin pharmacologically, though is a more potent inhibitor of growth hormone, glucagon, and insulin than the natural hormone and has a much longer half life (approximately 90 minutes, compared to 2-3 minutes for somatostatin). Since it is absorbed poorly from the gut, it is administered subcutaneously.
Lanreotide (INN) is a medication used in the management of acromegaly and symptoms caused by neuroendocrine tumors, most notably carcinoid syndrome. It is a long-acting analogue of somatostatin, like octreotide.
[Lanreotide](as lanreotide acetate) is manufactured by Ipsen, and marketed under the trade name Somatuline. It is available in several countries, including the United Kingdom, Australia and Canada, and was approved for sale in the United States by the Food and Drug Administration (FDA) on August 30, 2007.
References
- ^ a b Costoff A. "Sect. 5, Ch. 4: Structure, Synthesis, and Secretion of Somatostatin". Endocrinology: The Endocrine Pancreas page 16. Medical College of Georgia. Retrieved on 2008-02-19.
- ^ Costanzo, Linda S. (2003). Physiology, 3rd edition, Hagerstown, MD: Lippincott Williams & Wilkins, page 280. ISBN 0-7817-3919-5.
- ^ a b Bowen R (2002-12-14). "Somatostatin". Biomedical Hypertextbooks. Colorado State University. Retrieved on 2008-02-19.
- ^ a b Costoff A. "Sect. 5, Ch. 4: Structure, Synthesis, and Secretion of Somatostatin". Endocrinology: The Endocrine Pancreas page 17. Medical College of Georgia. Retrieved on 2008-02-19.
Further reading
- Florio T, Schettini G (2002). "[Somatostatin and its receptors. Role in the control of cell proliferation]". Minerva Endocrinol. 26 (3): 91–102. PMID 11753230.
- Yamada Y, Reisine T, Law SF, et al. (1993). "Somatostatin receptors, an expanding gene family: cloning and functional characterization of human SSTR3, a protein coupled to adenylyl cyclase". Mol. Endocrinol. 6 (12): 2136–42. PMID 1337145.
- Yamada Y, Post SR, Wang K, et al. (1992). "Cloning and functional characterization of a family of human and mouse somatostatin receptors expressed in brain, gastrointestinal tract, and kidney". Proc. Natl. Acad. Sci. U.S.A. 89 (1): 251–5. doi:10.1073/pnas.89.1.251. PMID 1346068.
- Brazeau P, Vale W, Burgus R, et al. (1973). "Hypothalamic polypeptide that inhibits the secretion of immunoreactive pituitary growth hormone". Science 179 (68): 77–9. doi:10.1126/science.179.4068.77. PMID 4682131.
- Shen LP, Pictet RL, Rutter WJ (1982). "Human somatostatin I: sequence of the cDNA". Proc. Natl. Acad. Sci. U.S.A. 79 (15): 4575–9. doi:10.1073/pnas.79.15.4575. PMID 6126875.
- Shen LP, Rutter WJ (1984). "Sequence of the human somatostatin I gene". Science 224 (4645): 168–71. doi:10.1126/science.6142531. PMID 6142531.
- Montminy MR, Goodman RH, Horovitch SJ, Habener JF (1984). "Primary structure of the gene encoding rat preprosomatostatin". Proc. Natl. Acad. Sci. U.S.A. 81 (11): 3337–40. doi:10.1073/pnas.81.11.3337. PMID 6145156.
- Zabel BU, Naylor SL, Sakaguchi AY, et al. (1984). "High-resolution chromosomal localization of human genes for amylase, proopiomelanocortin, somatostatin, and a DNA fragment (D3S1) by in situ hybridization". Proc. Natl. Acad. Sci. U.S.A. 80 (22): 6932–6. PMID 6196780.
- Panetta R, Greenwood MT, Warszynska A, et al. (1994). "Molecular cloning, functional characterization, and chromosomal localization of a human somatostatin receptor (somatostatin receptor type 5) with preferential affinity for somatostatin-28". Mol. Pharmacol. 45 (3): 417–27. PMID 7908405.
- Demchyshyn LL, Srikant CB, Sunahara RK, et al. (1993). "Cloning and expression of a human somatostatin-14-selective receptor variant (somatostatin receptor 4) located on chromosome 20". Mol. Pharmacol. 43 (6): 894–901. PMID 8100352.
- Kaupmann K, Bruns C, Hoyer D, et al. (1993). "Distribution and second messenger coupling of four somatostatin receptor subtypes expressed in brain". FEBS Lett. 331 (1-2): 53–9. doi:10.1016/0014-5793(93)80296-7. PMID 8405411.
- Aguila MC, Rodriguez AM, Aguila-Mansilla HN, Lee WT (1996). "Somatostatin antisense oligodeoxynucleotide-mediated stimulation of lymphocyte proliferation in culture". Endocrinology 137 (5): 1585–90. doi:10.1210/en.137.5.1585. PMID 8612489.
- Sharma K, Patel YC, Srikant CB (1997). "Subtype-selective induction of wild-type p53 and apoptosis, but not cell cycle arrest, by human somatostatin receptor 3". Mol. Endocrinol. 10 (12): 1688–96. PMID 8961277.
- Dournaud P, Boudin H, Schonbrunn A, et al. (1998). "Interrelationships between somatostatin sst2A receptors and somatostatin-containing axons in rat brain: evidence for regulation of cell surface receptors by endogenous somatostatin". J. Neurosci. 18 (3): 1056–71. PMID 9437026.
- Barnea A, Roberts J, Ho RH (1999). "Evidence for a synergistic effect of the HIV-1 envelope protein gp120 and brain-derived neurotrophic factor (BDNF) leading to enhanced expression of somatostatin neurons in aggregate cultures derived from the human fetal cortex". Brain Res. 815 (2): 349–57. doi:10.1016/S0006-8993(98)01098-1. PMID 9878821.
- Ferone D, van Hagen PM, van Koetsveld PM, et al. (1999). "In vitro characterization of somatostatin receptors in the human thymus and effects of somatostatin and octreotide on cultured thymic epithelial cells". Endocrinology 140 (1): 373–80. PMID 9886848.
- Brakch N, Lazar N, Panchal M, et al. (2002). "The somatostatin-28(1-12)-NPAMAP sequence: an essential helical-promoting motif governing prosomatostatin processing at mono- and dibasic sites". Biochemistry 41 (5): 1630–9. doi:10.1021/bi011928m. PMID 11814357.
- Oomen SP, van Hennik PB, Antonissen C, et al. (2002). "Somatostatin is a selective chemoattractant for primitive (CD34(+)) hematopoietic progenitor cells". Exp. Hematol. 30 (2): 116–25. doi:10.1016/S0301-472X(01)00772-X. PMID 11823046.
- Simonetti M, Di BC (2002). "Structural motifs in the maturation process of peptide hormones. The somatostatin precursor. I. A CD conformational study". J. Pept. Sci. 8 (2): 66–79. doi:10.1002/psc.370. PMID 11860030.
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