Cited by 187Sirtuins and Resveratrol in MedicineLiver Disease Diagnosis and TreatmentNuclear Receptors and Signaling

Sirtuin 1 (SIRT1) protein degradation in response to persistent c-Jun N-terminal kinase 1 (JNK1) activation contributes to hepatic steatosis in obesity

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Gao, Zhanguo, Zhang, Jin, Kheterpal, Indu, Kennedy, Norm, Davis, Roger J., Ye, Jianping·2011·Journal of Biological Chemistry

Abstract

SIRT1 is involved in the pathogenesis of obesity, diabetes, and aging. However, it is not clear how SIRT1 activity is regulated by intracellular kinases in cells. In this study, we investigated SIRT1 phosphorylation and protein degradation in response to JNK1 activation in obese mice. Mouse SIRT1 is phosphorylated by JNK1 at Ser-46 (Ser-47 in human SIRT1), which is one of the four potential residues targeted by JNK1. The phosphorylation induces a brief activation of SIRT1 function and degradation of SIRT1 thereafter by the proteasome. Ubiquitination occurs in SIRT1 protein after the phosphorylation. Mutation of Ser-46 to alanine prevents the phosphorylation, ubiquitination, and degradation. In vivo, SIRT1 undergoes an extensive degradation in hepatocytes in obesity as a consequence of persistent activation of JNK1. The degradation leads to inhibition of SIRT1 function, which contributes to development of hepatic steatosis. The degradation disappears in obesity when JNK1 is inactivated in mice. JNK2 exhibits an opposite activity in the regulation of SIRT1 degradation. The JNK1-SIRT1 pathway provides a new molecular mechanism for the pathogenesis of hepatic steatosis in obesity.

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Authors
Gao, Z., Zhang, J., Kheterpal, I., Kennedy, N., Davis, R. J., & Ye, J.
Affiliations
  • Pennington Biomedical Research Center (US)
  • Howard Hughes Medical Institute (US)
Corresponding author
Ye, Jianping
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2011-06
Volume
286
Issue
25
Pages
22227-22234
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2001428385
Cited by
187
References
46
Citations by year
2026: 6 · 2025: 4 · 2024: 7 · 2023: 5 · 2022: 6 · 2021: 15 · 2020: 12 · 2019: 15 · 2018: 16 · 2017: 16 · 2016: 17 · 2015: 20 · 2014: 13 · 2013: 21 · 2012: 13
FWCI
7.31
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • The Journal of the American Medical Association (JAMA) Network (American Medical Association) (submittedVersion)
Funders
  • National Institutes of Health (DK085495)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK-085495, R56DK068036, R01DK085495, R01DK068036, DK068036, P30DK072476)
Topics
  • Health Sciences › Medicine › Geriatrics and Gerontology › Sirtuins and Resveratrol in Medicine
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Nuclear Receptors and Signaling
Keywords
SIRT1, JNK1, JNK2, protein degradation, ubiquitination, proteasome, hepatic steatosis, obesity, hepatocytes
MeSH terms
Animals, Cell Line, Dietary Fats, Enzyme Activation, Fatty Liver, Histone Deacetylases, Humans, Male, Mice, Inbred C57BL, Obesity, Phosphorylation, Mitogen-Activated Protein Kinase 8, Mice, Rats, Ubiquitination, Gene Knockout Techniques, Sirtuin 1

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