Title: Effects of growth hormone-releasing hormone agonistic analog MR-409 on insulin-secreting cells under cyclopiazonic acid-induced endoplasmic reticulum stress
Author: Amaral, Maria Esméria C.; Ribeiro, Rosane A.; Vanzela, Emerielle C.; Barbosa-sampaio, Helena C.
Is part of: International Journal of Experimental Pathology (Print), v. n/a, p. n/a - n/a
Citation: Amaral, Maria Esméria C.; Ribeiro, Rosane A.; Vanzela, Emerielle C.; Barbosa-sampaio, Helena C.; Effects of growth hormone-releasing hormone agonistic analog MR-409 on insulin-secreting cells under cyclopiazonic acid-induced endoplasmic reticulum stress. International Journal of Experimental Pathology (Print), v.n/a, p. n/a-n/a, 2016
Abstract: The endoplasmic reticulum (ER) stress is one of the mechanisms related to decreased insulin secretion and beta cell death, contributing to the progress of type 2 diabetes mellitus (T2D). Thus, investigating agents that can influence this process would help prevent the development of T2D. Recently, the growth-hormone-releasing hormone (GHRH) action has been demonstrated in INS-1E cells, in which it increases cell proliferation and insulin secretion. As the effects of GHRH and its agonists have not been fully elucidated in the beta cell, we proposed to investigate them by evaluating the role of the GHRH agonist, MR-409, in cells under ER stress. Our results show that the agonist was unable to ameliorate or prevent ER stress. However, cells exposed to the agonist showed less oxidative stress and greater survival even under ER stress. The mechanisms by which GHRH agonist, MR-409, leads to these outcomes require further investigation.
Funding: This work was supported by Sao Paulo Research Foundation FAPESP (http://www.fapesp.br/, grant Nos. 2018/00665-6, 2018/06363-1 and 2015/12611-0) and National Council for Scientific and Technological Development - CNPq for financial support (http://cnpq.br/) in Brazil. The work on GHRH agonist, in Miami, was supported by the Medical Research Service of the Department of Veterans Affairs and by the University of Miami Miller School of Medicine.