IMR Press / FBL / Volume 22 / Issue 9 / DOI: 10.2741/4556

Frontiers in Bioscience-Landmark (FBL) is published by IMR Press from Volume 26 Issue 5 (2021). Previous articles were published by another publisher on a subscription basis, and they are hosted by IMR Press on imrpress.com as a courtesy and upon agreement with Frontiers in Bioscience.

Open Access Article

Ghrelin doesn’t limit insulin release in pregnant rats fed low protein diet

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1 Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston TX 77030, USA
2 Texas Children’s Hospital, Houston TX 77030, USA
3 Department of Biochemistry, Rice University, Houston TX 77030, USA

Academic Editor: Guoyao Wu

Front. Biosci. (Landmark Ed) 2017, 22(9), 1523–1533; https://doi.org/10.2741/4556
Published: 1 March 2017
(This article belongs to the Special Issue Amino acids in nutrition, health, and disease)
Abstract

To test the hypothesis that insulin secretion in pregnant rats fed LP diet is reduced by ghrelin signaling in pancreatic islets, we investigated plasma insulin levels, expression of ghrelin and its receptor and glucose stimulated insulin secretion (GSIS) of pancreatic islets in response to ghrelin. Plasma insulin levels were lower and ghrelin receptor abundance in islets was unaltered in LP rats. In the presence of both 2.8 and 16.7 mM glucose, GSIS was lower in LP compared to CT rats. In the presence of 2.8 mM glucose, GSIS was unaltered by ghrelin and its antagonist in both CT and LP rats. In the presence of 16.7 mM glucose, GSIS in LP rats was unchanged while in CT rats was reduced by ghrelin and reversed by ghrelin antagonist. These results indicate ghrelin signaling inhibits GSIS of pancreatic islets in pregnant rats fed CT diet, but it is blunted in pregnant rats fed LP diet and thus may not contribute to the reduction of plasma insulin and GSIS of pancreatic islets in late pregnancy.

Keywords
Ghrelin
Insulin
Pancreatic Islet
Pregnancy
Low Protein Diet
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