期刊
JOURNAL OF BIOLOGICAL RHYTHMS
卷 32, 期 3, 页码 212-221出版社
SAGE PUBLICATIONS INC
DOI: 10.1177/0748730417704534
关键词
Akt; circadian rhythms; amplitude; aorta; gene expression
资金
- NIH [R01 HL64793, R01 HL61371, P01 HL1070295, T32 GM007324]
- American Heart Association MERIT Grant
- AHA grant [15PRE21670000]
- Sarnoff Cardiovascular Research Foundation
- George M. O'Brien Kidney Center Grant from NIH [P30 DK079310]
The AKT signaling pathway is important for circadian rhythms in mammals and flies (Drosophila). However, AKT signaling in mammals is more complicated since there are 3 isoforms of AKT, each performing slightly different functions. Here we study the most ubiquitous AKT isoform, Akt1, and its role at the organismal level in the central and vascular peripheral clocks. Akt1(-/-) mice exhibit relatively normal behavioral rhythms with only minor differences in circadian gene expression in the liver and heart. However, circadian gene expression in the Akt1(-/-) aorta, compared with control aorta, follows a distinct pattern. In the Akt1(-/-) aorta, positive regulators of circadian transcription have lower amplitude rhythms and peak earlier in the day, and negative circadian regulators are expressed at higher amplitudes and peak later in the day. In endothelial cells, negative circadian regulators exhibit an increased amplitude of expression, while the positive circadian regulators are arrhythmic with a decreased amplitude of expression. This indicates that Akt1 conditions the normal circadian rhythm in the vasculature more so than in other peripheral tissues where other AKT isoforms or kinases might be important for daily rhythms.
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