Mammalian bombesin-like peptides are widely distributed in the central nervous system as well as in the gastrointestinal tract, where they modulate smooth-muscle contraction, exocrine and endocrine processes, metabolism, and behavior. They bind to G protein-coupled receptors on the cell surface to elicit their effects. Bombesin-like peptide receptors include gastrin-releasing peptide receptor, neuromedin B receptor, and bombesin-like receptor-3 (BRS3; this article).[3][4]
BB3 is a G protein-coupled receptor.[2] BB3 only interacts with known naturally occurring bombesin-related peptides with low affinity and therefore, as it has no natural high-affinity ligand, is classified as an orphan receptor.[2][5][6]
References
↑"Bombesin Receptors: BB3". IUPHAR Database of Receptors and Ion Channels. International Union of Basic and Clinical Pharmacology.
↑ 3.03.1Ohki-Hamazaki H, Wada E, Matsui K, Wada K (July 1997). "Cloning and expression of the neuromedin B receptor and the third subtype of bombesin receptor genes in the mouse". Brain Res. 762 (1–2): 165–72. doi:10.1016/S0006-8993(97)00380-6. PMID9262170.
↑Mantey SA, Weber HC, Sainz E, Akeson M, Ryan RR, Pradhan TK, Searles RP, Spindel ER, Battey JF, Coy DH & Jensen RT (1997). "Discovery of a high affinity radioligand for the human orphan receptor, bombesin receptor subtype 3, which demonstrates that it has a uniquepharmacology compared with other mammalian bombesin receptors". J. Biol. Chem. 272 (41): 26062–26071. doi:10.1074/jbc.272.41.26062. PMID9325344.
Gorbulev V, Akhundova A, Grzeschik KH, Fahrenholz F (1994). "Organization and chromosomal localization of the gene for the human bombesin receptor subtype expressed in pregnant uterus". FEBS Lett. 340 (3): 260–4. doi:10.1016/0014-5793(94)80150-9. PMID8131855.
Fathi Z, Corjay MH, Shapira H, et al. (1993). "BRS-3: a novel bombesin receptor subtype selectively expressed in testis and lung carcinoma cells". J. Biol. Chem. 268 (8): 5979–84. PMID8383682.
Kane MA, Toi-Scott M, Johnson GL, et al. (1996). "Bombesin-like peptide receptors in human bronchial epithelial cells". Peptides. 17 (1): 111–8. doi:10.1016/0196-9781(95)02088-8. PMID8822519.
Ryan RR, Weber HC, Hou W, et al. (1998). "Ability of various bombesin receptor agonists and antagonists to alter intracellular signaling of the human orphan receptor BRS-3". J. Biol. Chem. 273 (22): 13613–24. doi:10.1074/jbc.273.22.13613. PMID9593699.
Liu J, Lao ZJ, Zhang J, et al. (2002). "Molecular basis of the pharmacological difference between rat and human bombesin receptor subtype-3 (BRS-3)". Biochemistry. 41 (28): 8954–60. doi:10.1021/bi0202777. PMID12102638.
