Journal
CELL REPORTS
Volume 14, Issue 2, Pages 234-242Publisher
CELL PRESS
DOI: 10.1016/j.celrep.2015.12.023
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Funding
- Israel Science Foundation
- I-Core Foundation
- Israeli Ministry of Health
- TEVA NNE program
- ESFD
- ERC: European Research Council
- European Foundation for the Study of Diabetes [MSD 2014_1] Funding Source: researchfish
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Mice overexpressing the longevity protein SIRT6 or deficient for the liver's most prevalent microRNA miR-122 display a similar set of phenotypes, including improved lipid profile and protection against damage linked to obesity. Here, we show that miR-122 and SIRT6 negatively regulate each other's expression. SIRT6 downregulates miR-122 by deacetylating H3K56 in the promoter region. MiR-122 binds to three sites on the SIRT6 3' UTR and reduces its levels. The interplay between SIRT6 and miR-122 is manifested in two physiologically relevant ways in the liver. First, they oppositely regulate a similar set of metabolic genes and fatty acid beta-oxidation. Second, in hepatocellular carcinoma patients, loss of a negative correlation between SIRT6 and miR-122 expression is significantly associated with better prognosis. These findings show that SIRT6 and miR-122 negatively regulate each other to control various aspects of liver physiology and SIRT6-miR-122 correlation may serve as a biomarker for hepatocarcinoma prognosis.
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