Negative reciprocal regulation between Sirt1 and Per2 modulates the circadian clock and aging.

Abstract:

:Sirtuin 1 (SIRT1) is involved in both aging and circadian-clock regulation, yet the link between the two processes in relation to SIRT1 function is not clear. Using Sirt1-deficient mice, we found that Sirt1 and Period 2 (Per2) constitute a reciprocal negative regulation loop that plays important roles in modulating hepatic circadian rhythmicity and aging. Sirt1-deficient mice exhibited profound premature aging and enhanced acetylation of histone H4 on lysine16 (H4K16) in the promoter of Per2, the latter of which leads to its overexpression; in turn, Per2 suppresses Sirt1 transcription through binding to the Sirt1 promoter at the Clock/Bmal1 site. This negative reciprocal relationship between SIRT1 and PER2 was also observed in human hepatocytes. We further demonstrated that the absence of Sirt1 or the ectopic overexpression of Per2 in the liver resulted in a dysregulated pace of the circadian rhythm. The similar circadian rhythm was also observed in aged wild type mice. The interplay between Sirt1 and Per2 modulates aging gene expression and circadian-clock maintenance.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Wang RH,Zhao T,Cui K,Hu G,Chen Q,Chen W,Wang XW,Soto-Gutierrez A,Zhao K,Deng CX

doi

10.1038/srep28633

subject

Has Abstract

pub_date

2016-06-27 00:00:00

pages

28633

issn

2045-2322

pii

srep28633

journal_volume

6

pub_type

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