Cited by 58Liver physiology and pathologyCancer-related Molecular PathwaysDrug-Induced Hepatotoxicity and Protection

Switch from Mnt‐Max to Myc‐Max induces p53 and cyclin D1 expression and apoptosis during cholestasis in mouse and human hepatocytes†

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Yang, Heping, Li, Tony W. H., Ko, Kwang Suk, Xia, Meng, Lu, Shelly C.·2009·Hepatology

Abstract

UNLABELLED: Toxic bile acids induce hepatocyte apoptosis, for which p53 and cyclin D1 have been implicated as underlying mediators. Both p53 and cyclin D1 are targets of c-Myc, which is also up-regulated in cholestasis. Myc and Mnt use Max as a cofactor for DNA binding. Myc-Max typically activates transcription via E-box binding. Mnt-Max also binds the E-box sequence but serves as a repressor and inhibits the enhancer activity of Myc-Max. The current work tested the hypothesis that the switch from Mnt-Max to Myc-Max is responsible for p53 and cyclin D1 up-regulation and apoptosis during cholestasis. Following common bile duct ligation or left hepatic bile duct ligation, the expression of p53, c-Myc, and cyclin D1 increased markedly, whereas Mnt expression decreased. Nuclear binding activity of Myc to the E-box element of p53 and cyclin D1 increased, whereas that of Mnt decreased in a time-dependent fashion. Lithocholic acid (LCA) treatment of primary human hepatocytes and HuH-7 cells induced a similar switch from Mnt to Myc and increased p53 and cyclin D1 promoter activity and endogenous p53 and cyclin D1 expression and apoptosis. Blocking c-Myc induction in HuH-7 cells prevented the LCA-mediated increase in p53 and cyclin D1 expression and reduced apoptosis. Lowering Mnt expression further enhanced LCA's inductive effect on p53 and cyclin D1. Bile duct-ligated mice treated with a lentivirus harboring c-myc small interfering RNA were protected from hepatic induction of p53 and cyclin D1, a switch from Mnt to Myc nuclear binding to E-box, and hepatocyte apoptosis. CONCLUSION: The switch from Mnt to Myc during bile duct ligation and in hepatocytes treated with LCA is responsible for the induction in p53 and cyclin D1 expression and contributes to apoptosis.

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  1. [19]Shackel NA McGuinness PH Abbott CA Gorrell MD McCaughan GW Identification of novel molecules and pathogenic pathways in primary biliary cirrhosis: cDNA array analysis of intrahepatic differential gene expression Gut 2001 49 565 576 11559656 PMC1728487

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Authors
Yang, H., Li, T. W. H., Ko, K. S., Xia, M., & Lu, S. C.
Affiliations
University of Southern California (US)
Corresponding author
  • Yang, Heping
  • Lu, Shelly C.
Venue
Hepatology
Published
2009-03
Volume
49
Issue
3
Pages
860-870
ISSN
0270-9139 (ISSN-L)
OpenAlex
W2070024353
Cited by
58
References
32
Citations by year
2026: 3 · 2024: 3 · 2023: 1 · 2022: 2 · 2021: 5 · 2020: 3 · 2019: 3 · 2018: 2 · 2017: 6 · 2016: 7 · 2015: 4 · 2014: 3 · 2013: 7 · 2012: 1
FWCI
1.97
Type
journal article
Language
en
Open access
Locations
  • Hepatology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (DK45334, DK51719)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK51719, R01DK045334, DK-45334, P30-DK-48522, P30DK048522, R56DK045334, R01DK051719)
Topics
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Drug-Induced Hepatotoxicity and Protection
Keywords
cholestasis, hepatocyte apoptosis, c-Myc, p53, cyclin D1, bile acids, lithocholic acid, E-box binding, bile duct ligation
MeSH terms
Animals, Base Sequence, Cells, Cultured, Cholestasis, Disease Models, Animal, Humans, Ligation, Lithocholic Acid, Male, Mice, Inbred C57BL, Repressor Proteins, Signal Transduction, Tumor Suppressor Protein p53, Proto-Oncogene Proteins c-myc, Apoptosis, Cyclin D1, Hepatocytes, Cell Line, Tumor, Mice, Basic Helix-Loop-Helix Leucine Zipper Transcription Factors

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