Cited by 232Liver physiology and pathologyOrgan Transplantation Techniques and OutcomesCongenital heart defects research

c-Jun/AP-1 controls liver regeneration by repressing p53/p21 and p38 MAPK activity

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Stepniak, Ewa, Ricci, Romeo, Eferl, Robert, Sumara, Grzegorz, Sumara, Izabela, Rath, Martina, Hui, Lijian, Wagner, Erwin F.·2006·Genes & Development

Abstract

The AP-1 transcription factor c-Jun is a key regulator of hepatocyte proliferation. Mice lacking c-Jun in the liver ( c-jun Δli* ) display impaired liver regeneration after partial hepatectomy (PH). This phenotype correlates with increased protein levels of the cdk-inhibitor p21 in the liver. We performed PH experiments in several double-knockout mouse models to genetically identify the signaling events regulated by c-Jun. Inactivation of p53 in c-jun Δli* mice abrogated both hepatocyte cell cycle block and increased p21 protein expression. Consistently, liver regeneration was rescued in c-jun Δli* p21 −/− double-mutant mice. This indicated that c-Jun controls hepatocyte proliferation by a p53/p21-dependent mechanism. Analyses of p21 mRNA and protein expression in livers of c-jun Δli* mice after PH revealed that the accumulation of p21 protein is due to a post-transcriptional/post-translational mechanism. We have investigated several candidate pathways implicated in the regulation of p21 expression, and observed increased activity of the stress kinase p38 in regenerating livers of c-jun Δli* mice. Importantly, conditional deletion of p38 α in livers of c-jun Δli* mice fully restored hepatocyte proliferation and attenuated increased p21 protein levels after PH. These data demonstrate that c-Jun/AP-1 regulates liver regeneration through a novel molecular pathway that involves p53, p21, and the stress kinase p38α.

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Authors
Stepniak, E., Ricci, R., Eferl, R., Sumara, G., Sumara, I., Rath, M., Hui, L., & Wagner, E. F.
Affiliations
Research Institute of Molecular Pathology (AT)
Corresponding author
Wagner, Erwin F.
Venue
Genes & Development
Published
2006-08-15
Volume
20
Issue
16
Pages
2306-2314
ISSN
  • 0890-9369 (ISSN-L)
  • 1549-5477
OpenAlex
W2166342119
Cited by
232
References
43
Citations by year
2026: 8 · 2025: 9 · 2024: 7 · 2023: 9 · 2022: 13 · 2021: 15 · 2020: 8 · 2019: 15 · 2018: 7 · 2017: 15 · 2016: 8 · 2015: 13 · 2014: 11 · 2013: 9 · 2012: 14
Type
posted content
Language
en
Open access
Locations
  • Genes & Development (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
Funders
Marie Curie (CT 2001-01)
Topics
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
  • Health Sciences › Medicine › Surgery › Organ Transplantation Techniques and Outcomes
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Congenital heart defects research
Keywords
c-Jun, AP-1 transcription factor, liver regeneration, partial hepatectomy, hepatocyte proliferation, p53, p21, p38 MAPK, p38α, cyclin-dependent kinase inhibitors, post-transcriptional regulation, conditional knockout mice, cell cycle arrest
MeSH terms
Animals, Female, Hepatectomy, Liver, Liver Regeneration, Male, Phosphorylation, Protein Processing, Post-Translational, RNA Processing, Post-Transcriptional, Signal Transduction, Genes, p53, Tumor Suppressor Protein p53, Proto-Oncogene Proteins c-jun, Genes, jun, Gene Deletion, Mice, Knockout, Transcription Factor AP-1, Hepatocytes, p38 Mitogen-Activated Protein Kinases, Cyclin-Dependent Kinase Inhibitor p21, Mice

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