Inhibition of TGFbeta1-mediated PAI-1 induction by oltipraz through selective interruption of Smad 3 activation.

Abstract:

:Transforming growth factor-beta1 (TGFbeta1) induces plasminogen activator inhibitor-1 (PAI-1) as a major target protein. PAI-1 is associated with fibrosis, thrombosis, and metabolic disorders. TGFbeta1 induces PAI-1 via phosphorylation and nuclear translocation of Smads. Oltipraz inhibits TGFbeta1 expression and also regenerates cirrhotic liver. Nevertheless, whether oltipraz modulates TGFbeta1-mediated cell signaling is unclear. First, this study examined the effect of oltipraz on PAI-1 expression in cirrhotic rat liver. The cells immunochemically stained with anti-PAI-1 antibody accumulated around and within fibrous nodules in cirrhotic liver, which was notably decreased by oltipraz treatment. Next, whether oltipraz inhibits TGFbeta1-mediated Smads activation or Smad-mediated PAI-1 induction was determined in L929 fibroblasts. Oltipraz inhibited the ability of TGFbeta1 to induce PAI-1, as indicated by repression of TGFbeta1-mediated luciferase induction from the plasmid comprising the human PAI-1 promoter and of TGFbeta1-induced Smad-DNA-binding activity. TGFbeta1 induced nuclear transport of receptor-regulated Smad 2 and Smad 3, of which oltipraz selectively inhibited the transport and phosphorylation of Smad 3, thereby reducing formation of Smad 3/4 complex in the nucleus. In summary, oltipraz inhibits PAI-1 induction via a decrease in the formation of Smad 3/4 complex due to selective interruption of Smad 3 activation, indicating that oltipraz regulates the cellular responses downstream of ligand-activated TGFbeta1 receptor.

journal_name

Cytokine

journal_title

Cytokine

authors

Cho IJ,Kim SH,Kim SG

doi

10.1016/j.cyto.2006.10.001

subject

Has Abstract

pub_date

2006-09-01 00:00:00

pages

284-94

issue

5-6

eissn

1043-4666

issn

1096-0023

pii

S1043-4666(06)00275-4

journal_volume

35

pub_type

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