Endoplasmic reticulum stress induces up-regulation of hepatic β-Klotho expression through ATF4 signaling pathway

Biochemical and Biophysical Research Communications
Kun DongWeiping Jia

Abstract

Fibroblast growth factor 21 (FGF21) plays critical roles in regulating glucose and lipid metabolism. β-Klotho is the co-receptor for mediating FGF21 signaling, and the mRNA levels of this receptor are increased in the liver of human subjects with obesity. However, the molecular mechanisms underlying the regulation of β-klotho expression remain poorly defined. Here, we report that elevation of β-klotho protein expression in diet-induced obese mice and human patients is associated with increased endoplasmic reticulum (ER) stress. In vivo study indicates that administration of the ER stressor tunicamycin in mice led to increased expression of β-klotho in the liver. In addition, we show that ER stress is sufficient to potentiate FGF21 signaling in HepG2 cell and ATF4 signaling pathway is essential for mediating the effect of ER stress on β-klotho expression. These findings demonstrate a link of ER stress with up-regulation of hepatic β-klotho expression and the molecular mechanism underlying ER stress-regulated FGF21 signaling.

References

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Citations

Mar 31, 2018·Hepatology Research : the Official Journal of the Japan Society of Hepatology·Nian TanPing Zhang
Mar 18, 2019·Reviews in Endocrine & Metabolic Disorders·Farzane Shanebandpour TabariBahman Yousefi
Nov 17, 2019·Apoptosis : an International Journal on Programmed Cell Death·Jennifer MytychMarek Koziorowski
Apr 18, 2018·Frontiers in Physiology·Gianluigi MazzoccoliTommaso Mazza

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