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Cell Growth & Differentiation, Vol 8, Issue 10 1049-1059, Copyright © 1997 by American Association of Cancer Research
ARTICLES |
M Arsura, MJ FitzGerald, N Fausto and GE Sonenshein
Department of Biochemistry, Boston University School of Medicine, Massachusetts 02118-2394, USA.
Treatment of hepatocytes with transforming growth factor beta1 (TGF-beta1) induces growth arrest, which is followed by extensive cell death by apoptosis. Previously, we found that TGF-beta1 down-modulates nuclear factor (NF)-kappaB/Rel activity in murine B cell lymphomas, inducing apoptosis. Furthermore, p65 (RelA)-deficient mice died during gestation due to apoptosis of liver cells. Here we have explored the effects of TGF-beta1 on hepatocytes, using two untransformed murine hepatocyte cell lines, AML-12 and NMH, which constitutively express classical NF-kappaB. TGF-beta1 treatment caused increased NF-kappaB binding that was followed by a dramatic decrease in NF-kappaB levels that preceded apoptosis. Ectopic c-Rel expression ablated apoptosis induced by TGF-beta1. The down-regulation in NF-kappaB activity correlated with elevated IkappaB-alpha expression due to hypophosphorylation and increased IkappaB-alpha protein stability. Thus, NF-kappaB factor expression acts directly to promote liver cell survival. Furthermore, these findings characterize a novel signaling pathway for TGF-beta1 in epithelial cells involving down-regulation of NF-kappaB/Rel factors activity through posttranslational modification of IkappaB-alpha protein.
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