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Neuromedin B.

H Ohki-Hamazaki1

  • 1Department of Molecular Neuroscience, Medical Research Institute, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, 113-8519, Tokyo, Japan. hamazaki.aud@mri.tmd.ac.jp

Progress in Neurobiology
|June 7, 2000
PubMed
Summary
This summary is machine-generated.

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Neuromedin B (NMB) and its receptor (NMB-R) regulate various physiological functions. Studies using NMB-R-deficient mice clarify NMB-R

Area of Science:

  • Neuroscience
  • Endocrinology
  • Gastroenterology

Background:

  • Neuromedin B (NMB) is a mammalian bombesin (BN)-related peptide found in the central nervous system and gastrointestinal tract.
  • BN-related peptides influence numerous physiological processes, including secretions, smooth muscle contraction, feeding, and cell growth.
  • NMB acts via a specific G-protein coupled receptor, NMB receptor (NMB-R), which is expressed in various brain regions and the GI tract.

Purpose of the Study:

  • To review the molecular characteristics, anatomical distribution, and pharmacological properties of NMB and NMB-R.
  • To report on the physiological roles of NMB and NMB-R, particularly as elucidated through studies on NMB-R-deficient mice.
  • To compare the NMB/NMB-R system with the GRP/GRP-R system to enhance understanding of mammalian BN-like peptide systems.

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Main Methods:

  • Literature review focusing on molecular characterization, distribution, and pharmacology of NMB and NMB-R.
  • Analysis of data from NMB-R-deficient mice generated via gene-targeting.
  • Comparative analysis with the GRP/GRP-R system.

Main Results:

  • NMB-R is a G-protein coupled receptor mediating intracellular signaling cascades like phospholipase activation and calcium mobilization.
  • NMB-R is found in key brain areas (olfactory, thalamic regions) and the gastrointestinal tract.
  • NMB-R-deficient mice models have been instrumental in distinguishing NMB-R functions from those of GRP-R.

Conclusions:

  • The review consolidates current knowledge on NMB and NMB-R.
  • NMB-R-deficient mouse studies provide crucial insights into the specific physiological functions of the NMB system.
  • Understanding the NMB/NMB-R system in comparison to GRP/GRP-R offers a comprehensive view of BN-like peptide signaling in mammals.