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We eliminated type β transforming growth factor (TGF-β) signaling by adenovirus-mediated local expression of a dominant-negative type II TGF-β receptor (AdCATβ-TR) in the liver of rats treated with dimethylnitrosamine, a model of persistent liver fibrosis. In rats that received a single application of AdCATβ-TR via the portal vein, liver fibrosis as assessed by histology and hydroxyproline content was markedly attenuated. All AdCATβ-TR-treated rats remained alive, and their serum levels of hyaluronic acid and transaminases remained at low levels, whereas all the AdCATβ-TR-untreated rats died of liver dysfunction. The results demonstrate that TGF-β does play a central role in liver fibrogenesis and indicate clearly in a persistent fibrosis model that prevention of fibrosis by anti-TGF-β intervention could be therapeutically useful.

Blockade of type β transforming growth factor signaling prevents liver fibrosis and dysfunction in the rat