Proliferation-correlated expression
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA580446 | ENA |
REPOSITORIES: ENA
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Project description:Mueller2015 - Hepatocyte proliferation, T160
phosphorylation of CDK2
This model is described in the article:
T160-phosphorylated CDK2
defines threshold for HGF-dependent proliferation in primary
hepatocytes.
Mueller S, Huard J, Waldow K, Huang
X, D'Alessandro LA, Bohl S, Börner K, Grimm D, Klamt S,
Klingmüller U, Schilling M.
Mol. Syst. Biol. 2015; 11(3): 795
Abstract:
Liver regeneration is a tightly controlled process mainly
achieved by proliferation of usually quiescent hepatocytes. The
specific molecular mechanisms ensuring cell division only in
response to proliferative signals such as hepatocyte growth
factor (HGF) are not fully understood. Here, we combined
quantitative time-resolved analysis of primary mouse hepatocyte
proliferation at the single cell and at the population level
with mathematical modeling. We showed that numerous G1/S
transition components are activated upon hepatocyte isolation
whereas DNA replication only occurs upon additional HGF
stimulation. In response to HGF, Cyclin:CDK complex formation
was increased, p21 rather than p27 was regulated, and Rb
expression was enhanced. Quantification of protein levels at
the restriction point showed an excess of CDK2 over CDK4 and
limiting amounts of the transcription factor E2F-1. Analysis
with our mathematical model revealed that T160 phosphorylation
of CDK2 correlated best with growth factor-dependent
proliferation, which we validated experimentally on both the
population and the single cell level. In conclusion, we
identified CDK2 phosphorylation as a gate-keeping mechanism to
maintain hepatocyte quiescence in the absence of HGF.
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