Category: Other neuropeptides
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Gastrin-releasing peptide aka GRP
Gastrin-releasing peptide, also known as GRP, is a neuropeptide, a regulatory molecule that has been implicated in a number of physiological and pathophysiological processes. Most notably, GRP stimulates the release of gastrin from the G cells of the stomach. The gene from which GRP is derived encodes a number of bombesin-like peptides. Its 148-amino acid preproprotein, following cleavage of a signal peptide, is further processed to…
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Neuromedin U
Neuromedin U (or NmU) is a neuropeptide found in the brain of humans and other mammals, which has a number of diverse functions including contraction of smooth muscle, regulation of blood pressure, pain perception, appetite, bone growth, and hormone release. It was first isolated from the spinal cord in 1985, and named after its ability to cause smooth muscle contraction in the uterus. Structure Neuromedin…
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Neuromedin S
Neuromedin S is a 36-amino acid neuropeptide found in the brain of humans and other mammals. It is produced in the suprachiasmatic nucleus of the hypothalamus and is related to neuromedin U. It is thought to be involved in regulation of circadian rhythm and also has appetite suppressant effects, as well as regulating the release of several other peptide hormones including vasopressin, luteinizing hormone, and oxytocin. See also References Peptides: neuropeptides Categories:
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Neuromedin N
Neuromedin N is a neuropeptide derived from the same precursor polypeptide as neurotensin, and with similar but subtly distinct expression and effects. References Peptides: neuropeptides Categories:
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Neuromedin B
Neuromedin B (NMB) is a bombesin-related peptide in mammals. It was originally purified from pig spinal cord, and later shown to be present in human central nervous system and gastrointestinal tract. Sequence The sequence of the C-terminal decapeptide is highly conserved across mammalian species: GNLWATGHFM-(NH2); this decapeptide is sometimes noted as neuromedin B, but it is more accurately described as neuromedin B…
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Bombesin (and a wee bit of ranatensin)
Bombesin is a 14-amino acid peptide originally isolated from the skin of the European fire-bellied toad (Bombina bombina) by Vittorio Erspamer et al. and named after its source. It has two known homologs in mammals called neuromedin B and gastrin-releasing peptide. It stimulates gastrin release from G cells. It activates three different G-protein-coupled receptors known as BBR1, -2, and -3. It also activates these receptors in the brain. Together with cholecystokinin, it is the second major source of negative feedback signals that stop…