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Comparison of gene expression profiles of Pten, Keap1 and Nrf2 knockout mouse livers.

ABSTRACT: Whole livers were collected from mice at the age of day 15 (P15). Total RNA was purified using Isogen.

ORGANISM(S): Mus musculus

PROVIDER: GSE50575 | GEO | 2013/12/31

SECONDARY ACCESSION(S): PRJNA217968

REPOSITORIES: GEO

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Comparison of gene expression profiles of Pten, Keap1 and Nrf2 knockout mouse livers.

Project description:Whole livers were collected from mice at the age of day 15 (P15). Total RNA was purified using Isogen. Gene expression was measured in livers at the age of 15 days (P15).

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Nrf2 enhances cholangiocyte expansion in Pten-deficient livers.

Project description:Keap1-Nrf2 system plays a central role in the stress response. While Keap1 ubiquitinates Nrf2 for degradation under unstressed conditions, this Keap1 activity is abrogated in response to oxidative or electrophilic stresses, leading to Nrf2 stabilization and coordinated activation of cytoprotective genes. We recently found that nuclear accumulation of Nrf2 is significantly increased by simultaneous deletion of Pten and Keap1, resulting in the stronger activation of Nrf2 target genes. To clarify the impact of the cross talk between the Keap1-Nrf2 and Pten-phosphatidylinositide 3-kinase-Akt pathways on the liver pathophysiology, in this study we have conducted closer analysis of liver-specific Pten::Keap1 double-mutant mice (Pten::Keap1-Alb mice). The Pten::Keap1-Alb mice were lethal by 1 month after birth and displayed severe hepatomegaly with abnormal expansion of ductal structures comprising cholangiocytes in a Nrf2-dependent manner. Long-term observation of Pten::Keap1-Alb::Nrf2(+/-) mice revealed that the Nrf2-heterozygous mice survived beyond 1 month but developed polycystic liver fibrosis by 6 months. Gsk3 directing the Keap1-independent degradation of Nrf2 was heavily phosphorylated and consequently inactivated by the double deletion of Pten and Keap1 genes. Thus, liver-specific disruption of Keap1 and Pten augments Nrf2 activity through inactivation of Keap1-dependent and -independent degradation of Nrf2 and establishes the Nrf2-dependent molecular network promoting the hepatomegaly and cholangiocyte expansion.

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