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

Autor: Sharma R; Research Unit of Biomedicine and Internal Medicine, Biocenter of Oulu, Medical Research Center, University of Oulu, Aapistie 5, 90220, Oulu, Finland., Raza GS; Research Unit of Biomedicine and Internal Medicine, Biocenter of Oulu, Medical Research Center, University of Oulu, Aapistie 5, 90220, Oulu, Finland., Sodum N; Research Unit of Biomedicine and Internal Medicine, Biocenter of Oulu, Medical Research Center, University of Oulu, Aapistie 5, 90220, Oulu, Finland., Walkowiak J; Department of Gastroenterology and Metabolism, Poznan University of Medical Sciences, 60572, Poznań, Poland., Herzig KH; Research Unit of Biomedicine and Internal Medicine, Biocenter of Oulu, Medical Research Center, University of Oulu, Aapistie 5, 90220, Oulu, Finland. karl-heinz.herzig@oulu.fi.; Department of Gastroenterology and Metabolism, Poznan University of Medical Sciences, 60572, Poznań, Poland. karl-heinz.herzig@oulu.fi.
Jazyk: angličtina
Zdroj: Pflugers Archiv : European journal of physiology [Pflugers Arch] 2024 Oct; Vol. 476 (10), pp. 1613-1621. Date of Electronic Publication: 2024 Jul 29.
DOI: 10.1007/s00424-024-02996-z
Abstrakt: 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 2 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 2 ) 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 2 ) 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.
(© 2024. The Author(s).)
Databáze: MEDLINE
Externí odkaz: