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

Patricia C. Borck, Thiago M. Batista, Jean F. Vettorazzi, Gabriela M. Soares, Camila Lubaczeuski, Dongyin Guan, Antonio C. Boschero, Elaine Vieira, Mitchell A. Lazar, Everardo M. Carneiro

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Objective: 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. Results: 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. Conclusion: 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.

Original languageEnglish (US)
Pages (from-to)250-258
Number of pages9
JournalMetabolism: clinical and experimental
Volume85
DOIs
StatePublished - Aug 2018
Externally publishedYes

Keywords

  • Clock genes
  • De novo lipogenesis
  • Exposure to artificial light at night
  • Hepatic steatosis
  • microRNAs

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

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