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Effect of hypoxia on GLP-1 secretion – an in vitro study using enteroendocrine STC-1 -cells as a model.

Authors :
Sharma, Ravikant
Raza, Ghulam Shere
Sodum, Nalini
Walkowiak, Jaroslaw
Herzig, Karl-Heinz
Source :
Pflügers Archiv: European Journal of Physiology; Oct2024, Vol. 476 Issue 10, p1613-1621, 9p
Publication Year :
2024

Abstract

Glucagon-like peptide (GLP)-1 is a hormone released by enteroendocrine L-cells after food ingestion. L-cells express various receptors for nutrient sensing including G protein-coupled receptors (GPRs). Intestinal epithelial cells near the lumen have a lower O<subscript>2</subscript> tension than at the base of the crypts, which leads to hypoxia in L-cells. We hypothesized that hypoxia affects nutrient-stimulated GLP-1 secretion from the enteroendocrine cell line STC-1, the most commonly used model. In this study, we investigated the effect of hypoxia (1% O<subscript>2</subscript>) on alpha-linolenic acid (αLA) stimulated GLP-1 secretion and their receptor expressions. STC-1 cells were incubated for 12 h under hypoxia (1% O<subscript>2</subscript>) and treated with αLA to stimulate GLP-1 secretion. 12 h of hypoxia did not change basal GLP-1 secretion, but significantly reduced nutrient (αLA) stimulated GLP-1 secretion. In normoxia, αLA (12.5 μM) significantly stimulated (~ 5 times) GLP-1 secretion compared to control, but under hypoxia, GLP-1 secretion was reduced by 45% compared to normoxia. αLA upregulated GPR120, also termed free fatty acid receptor 4 (FFAR4), expressions under normoxia as well as hypoxia. Hypoxia downregulated GPR120 and GPR40 expression by 50% and 60%, respectively, compared to normoxia. These findings demonstrate that hypoxia does not affect the basal GLP-1 secretion but decreases nutrient-stimulated GLP-1 secretion. The decrease in nutrient-stimulated GLP-1 secretion was due to decreased GPR120 and GPR40 receptors expression. Changes in the gut environment and inflammation might contribute to the hypoxia of the epithelial and L-cells. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00316768
Volume :
476
Issue :
10
Database :
Complementary Index
Journal :
Pflügers Archiv: European Journal of Physiology
Publication Type :
Academic Journal
Accession number :
179536746
Full Text :
https://doi.org/10.1007/s00424-024-02996-z