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Deletion of Smad2 in mouse liver reveals novel functions in hepatocyte growth and differentiation.

Smad family proteins Smad2 and Smad3 are activated by transforming growth factor beta (TGF-beta)/activin/nodal receptors and mediate transcriptional regulation. Although differential functional roles of Smad2 and Smad3 are apparent in mammalian development, the relative functional roles of Smad2 and Smad3 in postnatal systems remain unclear. We used Cre/loxP-mediated gene targeting for hepatocyte-specific deletion of Smad2 (S2HeKO) in adult mice and generated hepatocyte-selective Smad2/Smad3 double knockouts by intercrossing AlbCre/Smad2(f/f) (S2HeKO) and Smad3-deficient Smad3ex8/ex8 (S3KO) mice. All strains were viable and had normal adult liver. However, necrogenic CCL4-induced hepatocyte proliferation was significantly increased in S2HeKO compared to Ctrl and S3KO livers, and transplanted S2HeKO hepatocytes repopulated recipient liver at dramatically increased rates compared to Ctrl hepatocytes in vivo. Using primary hepatocytes, we found that TGF-beta-induced G1 arrest, apoptosis, and epithelial-to-mesenchymal transition in Ctrl and S2HeKO but not in S3KO hepatocytes. Interestingly, S2HeKO cells spontaneously acquired mesenchymal features characteristic of epithelial-to-mesenchymal transition (EMT). Collectively, these results demonstrate that Smad2 suppresses hepatocyte growth and dedifferentiation independent of TGF-beta signaling. Smad2 is not required for TGF-beta-stimulated apoptosis, EMT, and growth inhibition in hepatocytes.

Pubmed ID: 16382155 RIS Download

Mesh terms: Animals | Apoptosis | Carbon Tetrachloride Poisoning | Cell Differentiation | Cell Movement | Cell Proliferation | Cells, Cultured | Chemical and Drug Induced Liver Injury | Cyclin D1 | Hepatocytes | Liver | Mesoderm | Mice | Mice, Knockout | Smad2 Protein | Smad3 Protein | Transforming Growth Factor beta

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Associated grants

  • Agency: NIH HHS, Id: P5ODK064236-01003
  • Agency: NIDDK NIH HHS, Id: R01 DK056077
  • Agency: NIDDK NIH HHS, Id: U01 DK060995
  • Agency: NIDDK NIH HHS, Id: P30 DK041296
  • Agency: NIDDK NIH HHS, Id: R01DK60043
  • Agency: NIDDK NIH HHS, Id: R01 DK073960
  • Agency: NIDDK NIH HHS, Id: 2P30DK041296-16
  • Agency: NIDDK NIH HHS, Id: R01 DK060043
  • Agency: NIDDK NIH HHS, Id: R01DK56077
  • Agency: NCI NIH HHS, Id: R24 CA095823

Mouse Genome Informatics (Data, Gene Annotation)

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