Neuroendocrine regulatory peptide-2 stimulates glucose-induced insulin secretion in vivo and in vitro.

Neuroendocrine regulatory peptide-2 stimulates glucose-induced insulin secretion in vivo and in vitro.
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神经内分泌调节肽-2 在体内和体外刺激葡萄糖诱导的胰岛素分泌。

DOI:
10.1016/j.bbrc.2012.10.073
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发表时间:
2012
期刊:
Biochem Biophys Res Commun
影响因子:
--
通讯作者:
Nakazato M
Nakazato M
中科院分区:
--
文献类型:
--
作者:
Moin AS;Yamaguchi H;Rhee M;Kim JW;Toshinai K;Waise TM;Naznin F;Matsuo T;Sasaki K;Minamino N;Yoon KH;Nakazato M

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神经内分泌调节肽(neuroendocrine regulatory peptide,NERP)-2是近年来发现的一种参与中枢神经系统加压素分泌和摄食调节的生物活性肽,在外周组织内分泌细胞中大量表达。为了探索NERP-2在胰腺中的生理作用,我们检测了其对胰岛素分泌的影响。NERP-2以剂量依赖性方式增加葡萄糖刺激的胰岛素分泌(GSIS),最低有效剂量为10− 7 M,来自胰腺β细胞系MIN 6和分离的小鼠胰岛。NERP-2在低糖条件下不影响胰岛素分泌。NERP-1和NERP-2-Gly(非酰胺化NERP-2)均不刺激胰岛素分泌。麻醉大鼠静脉注射或清醒小鼠腹腔注射后,NERP-2显著增加GSIS。我们在胰岛中检测到NERP-2,它与胰岛素广泛共定位。钙成像分析表明,NERP-2增加了MIN 6细胞的钙内流。这些发现表明NERP-2通过升高细胞内钙浓度来调节GSIS。
Neuroendocrine regulatory peptide (NERP)-2, recently identified as a bioactive peptide involved in vasopressin secretion and feeding regulation in the central nervous system, is abundantly expressed in endocrine cells in peripheral tissues. To explore the physiological roles of NERP-2 in the pancreas, we examined its effects on insulin secretion. NERP-2 increased glucose-stimulated insulin secretion (GSIS) in a dose-dependent manner, with a lowest effective dose of 10−7M, from the pancreatic β-cell line MIN6 and isolated mouse pancreatic islets. NERP-2 did not affect insulin secretion under the low-glucose conditions. Neither NERP-1 nor NERP-2–Gly (nonamidated NERP-2) stimulated insulin secretion. NERP-2 significantly augmented GSIS after intravenous administration to anesthetized rats or intraperitoneal injection to conscious mice. We detected NERP-2 in pancreatic islets, where it co-localized extensively with insulin. Calcium-imaging analysis demonstrated that NERP-2 increased the calcium influx in MIN6 cells. These findings reveal that NERP-2 regulates GSIS by elevating intracellular calcium concentrations.
一种新型神经内分泌基因产物:内分泌和神经元群体中 VGF8a 基因的选择性表达和 VGF 蛋白的免疫定位。
DOI: --
发表时间: 1992
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期刊: Endocrinology.
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