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• W2015599978 abstract "Transforming growth factor-α and hepatocyte growth factor are important stimulators of hepatocyte proliferation. In this series of experiments we sought to measure the expression of transforming growth factor-α mRNA by hepatocytes in response to toxic liver injury produced by carbon tetrachloride or galactosamine and to perform a more detailed analysis of transforming growth factor-α expression after partial hepatectomy. We also explored the interactions of transforming growth factor-α and hepatocyte growth factor in their effects on hepatocytes in vitro and tested the ability of these factors to stimulate endogenous transforming growth factor-α production by hepatocytes. In previous work we have used oligonucleotide probes to measure transforming growth factor-α mRNA expression after partial hepatectomy. In this study we used a rat transforming growth factor-α cDNA probe and found that the level of liver transforming growth factor-α mRNA increases 4 hr after partial hepatectomy, shows peak expression at 18 hr and returns to the normal level by 36 to 48 hr. Measurement of the corresponding peptide in the liver by means of radioimmunoassay shows that the level of transforming growth factor-α rises by 12 hr, peaks at 24 hr and remains significantly increased at 48 hr compared with the levels in sham-operated rats. Carbon tetrachloride and galactosamine are known to produce different patterns of acute liver injury, with maximal hepatocyte DNA synthesis at 48 hr and 5 days, respectively. After carbon tetrachloride administration the profiles of the transforming growth factor-α and hepatocyte growth factor mRNA expression are similar, each showing two peaks: the first at 12 hr and the second at 48 hr. In contrast, after galactosamineinduced liver injury the expression patterns of transforming growth factor-α and hepatocyte growth factor mRNAs differ: hepatocyte growth factor shows a major peak at 24 hr, with a smaller increase at 5 days, whereas transforming growth factor-α begins to increase after 2 days, with a single peak occurring at 5 days. In primary hepatocyte cultures, transforming growth factor-α and hepatocyte growth factor appear to have complementary effects. The maximal hepatocyte nuclear labeling index induced by hepatocyte growth factor was 42%; the addition of transforming growth factor-α increased this to 74%. Exogenous transforming growth factor-α, but not hepatocyte growth factor, stimulates the production of the transforming growth factor-α peptide by hepatocytes. However, when hepatocyte growth factor is added to cultures already containing transforming growth factor-α it further increases the amount of transforming growth factor-α-stimulated transforming growth factor-α synthesis by approximately 40%. These results strengthen the view that transforming growth factor-α is an important physiological stimulator of hepatocyte replication in liver growth induced by partial hepatectomy and toxic injury and that hepatocyte growth factor may modulate hepatocyte transforming growth factor-α secretion. (HEPATOLOGY 1993;18:1422–1431.)" @default.
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• W2015599978 date "1993-12-01" @default.
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• W2015599978 title "Transforming growth factor-α expression during liver regeneration after partial hepatectomy and toxic injury, and potential interactions between transforming growth factor-α and hepatocyte growth factor" @default.
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• W2015599978 doi "https://doi.org/10.1002/hep.1840180622" @default.
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