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Clinico-Pathological Importance of TGF-?/Phospho-Smad Signaling during Human Hepatic Fibrocarcinogenesis #MMPMID29874844
Yoshida K; Matsuzaki K; Murata M; Yamaguchi T; Suwa K; Okazaki K
Cancers (Basel) 2018[Jun]; 10 (6): ä PMID29874844show ga
Chronic viral hepatitis is a global public health problem, with approximately 570 million persons chronically infected. Hepatitis B and C viruses increase the risk of morbidity and mortality from liver cirrhosis, hepatocellular carcinoma (HCC), and extrahepatic complications that develop. Hepatitis virus infection induces transforming growth factor (TGF)-?, which influences microenvironments within the infected liver. TGF-? promotes liver fibrosis by up-regulating extracellular matrix production by hepatic stellate cells. TGF-? is also up-regulated in patients with HCC, in whom it contributes importantly to bringing about a favorable microenvironment for tumor growth. Thus, TGF-? is thought to be a major factor regulating liver fibrosis and carcinogenesis. Since TGF-? carries out regulatory signaling by influencing the phosphorylation of Smads, we have generated several kinds of phospho-specific antibodies to Smad2/3. Using these, we have identified three types of phospohorylated forms: COOH-terminally phosphorylated Smad2/3 (pSmad2C and pSmad3C), linker phosphorylated Smad2/3 (pSmad2L and pSmad3L), and dually phosphorylated Smad3 (pSmad2L/C and pSmad3L/C). TGF-?-mediated pSmad2/3C signaling terminates cell proliferation; on the other hand, cytokine-induced pSmad3L signaling accelerates cell proliferation and promotes fibrogenesis. This review addresses TGF-?/Smad signal transduction in chronic liver injuries and carcinogenic processes. We also discuss the reversibility of Smad signaling after antiviral therapy.