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Chronic effects of neuroendocrine regulatory peptide (NERP-1 and -2) on insulin secretion and gene expression in pancreatic β-cells

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Author(s)
박재형송대규
Alternative Author(s)
Park, Jae HyungSong, Dae Kyu
Publication Year
2015
Abstract
Neuroendocrine regulatory peptides (NERP-1 and -2) are novel amidated peptides derived from VGF, a polypeptide secreted from neurons and endocrine cells through a regulated pathway. Dr. Nakazato Masamitsu reported that NERP-1 and -2 may have a local modulator function on the human endocrine system, and clearly showed expression of NERP-1 and -2 in human pancreas islets. Based on these data, we investigated the alteration of insulin secretion, insulin granule-related protein, and pancreas-specific transcription factors in response to NERPs expression. We confirmed the expression of NERP-1 and -2 in the pancreas of a human diabetes patient, in addition to diabetic animal models. When INS1 cells and primary rat islets were incubated with 10 nM NERPs for 3 days, glucose-stimulated insulin secretion levels were blunted by NERP-1 and -2. The number of insulin granules released from the readily releasable pool, which is associated with the first phase of glucose-stimulated insulin release, was decreased by NERP-1 and -2. Insulin granule-related proteins and mRNAs were down-regulated by NERP-2 treatment. NERP-2 decreased the expression of BETA2/NeuroD and insulin and controlled the nucleo-cytoplasmic translocation of FOXO1 and Pdx-1. We observed that NERP-2 levels were dramatically increased in diabetic pancreas. In conclusion, NERP-2 may play an important role in insulin secretion through the regulation of insulin secretory granules and β-cell transcription factors. In addition, NERP-2 expression is increased in diabetic conditions. Therefore, we suggest that NERPs may be potent endogenous suppressors of glucose-dependent insulin secretion.

Keywords
Neuroendocrine regulatory peptides (NERPs);
Insulin secretory granules (ISG);
Secretogranin (SCG);
Glucose-stimulated insulin secretion (GSIS);
β-Cell E-box transcription factor (BETA2);
Pancreatic duodenal homeobox-1 (Pdx-1)
Department
Dept. of Physiology (생리학)
Publisher
School of Medicine
Citation
Biochemical and Biophysical Research Communications, Vol.457(2) : 148-153, 2015
Type
Article
ISSN
0006-291X
DOI
10.1016/j.bbrc.2014.12.067
URI
http://kumel.medlib.dsmc.or.kr/handle/2015.oak/35156
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