Nighttime light exposure enhances Rev-erbα-targeting microRNAs and contributes to hepatic steatosis

Metabolism: Clinical and Experimental
Patricia Cristine BorckEverardo Magalhães Carneiro

Abstract

The exposure to artificial light at night (ALAN) disrupts the biological rhythms and has been associated with the development of metabolic syndrome. MicroRNAs (miRNAs) display a critical role in fine-tuning the circadian system and energy metabolism. In this study, we aimed to assess whether altered miRNAs expression in the liver underlies metabolic disorders caused by disrupted biological rhythms. We found that C3H/HePas mice exposed to ALAN developed obesity, and hepatic steatosis, which was paralleled by decreased expression of Rev-erbα and up-regulation of its lipogenic targets ACL and FAS in liver. Furthermore, the expression of Rev-erbα-targeting miRNAs, miR-140-5p, 185-5p, 326-5p and 328-5p were increased in this group. Consistently, overexpression of these miRNAs in primary hepatocytes reduced Rev-erbα expression at the mRNA and protein levels. Importantly, overexpression of Rev-erbα-targeting miRNAs increased mRNA levels of Acly and Fasn. Thus, altered miRNAs profile is an important mechanism underlying the disruption of the peripheral clock caused by exposure to ALAN, which could lead to hepatic steatosis.

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Citations

Jan 24, 2020·Clinical Science·Sneha RajuKathryn L Howe
Sep 25, 2020·International Journal of Molecular Sciences·Monika OkuliarovaMichal Zeman
Aug 6, 2020·International Journal of Molecular Sciences·Valentina S RumanovaMichal Zeman
Jan 27, 2021·Biochimica Et Biophysica Acta. Molecular Basis of Disease·Jianguo WuLi Wang
Mar 21, 2021·Developmental Biology·Nelson R Cabej
Aug 3, 2021·The Journal of Clinical Investigation·Dongyin Guan, Mitchell A Lazar

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