Neuromedin B: A novel bombesin-like peptide identified in porcine spinal cord

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Abstract

In our survey for unknown neuropeptides in porcine spinal cord, we have purified a novel decapeptide that exhibits a potent stimulant effect on the smooth muscle preparation of rat uterus. By microsequencing and synthesis, the peptide has been identified as Gly-Asn-Leu-Trp-Ala-Thr-Gly-His-Phe-Met-NH2. The peptide is found to have a surprising sequence homology to amphibian bombesins, and to display a potent contractile activity of rat uterus in the characteristic manner of the known bombesins. These facts strongly suggest that the peptide may be involved in the neural communication system of mammals as a neuromediator or hormone. Thus, we propose the name “neuromedin B” for the peptide.

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    Citation Excerpt :

    NMB was originally isolated from pig spinal cord and exerts a number of physiological and pathological effects by binding to its cell surface receptor, NMB receptor (NMBR). NMB expression has been detected in various tissues including the gastro-intestinal tract, spinal cord, pancreas, pituitary gland, and several areas of the brain [14–17]. In the central nervous system, NMB and NMBR regulate satiety, body temperature, and behaviors such as anxiety, fear, and memory responses [13].

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