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• W2032751203 abstract "Background/Aims: Hepatic stellate cells appear to be the main producers of hepatocyte growth factor of the normal liver. Insulin-like growth factors in doses over 20 ng/ml have been reported to stimulate hepatocyte growth factor production in cultured hepatic stellate cells. The aim of the present study was to investigate whether parenchymal cell conditioned medium had insulin-like growth factor-independent effects on hepatic stellate cells. Methods: Primary rat hepatic stellate cells were cultured for 1–7 days. DNA synthesis was measured by 3H-thymidine incorporation. Hepatocyte growth factor and transforming growth factor β1 immunoreactivity was quantified by ELISA. Hepatocyte growth factor mRNA levels were determined with gel RNase protection assay. Parenchymal cell conditioned medium was obtained from hepatocytes cultured for 2 days in medium without added serum or hormones. Results: Incubation of 1–7-day-old hepatic stellate cells for 2 days with parenchymal cell conditioned medium enhanced the medium content of hepatocyte growth factor. Parenchymal cell conditioned medium contained less than 5.0 ng/ml immunoreactive insulin-like growth factor-1 as measured by radio immunoassay. Parenchymal cell conditioned medium did not contain any insulin-like growth factor bioactivity measured as phosphorylation of type 1 insulin-like growth factor receptor β subunit and a protein with a size consistent with that of insulin receptor substrate-1. The stimulatory effect of parenchymal cell conditioned medium on hepatocyte growth factor was time- and dose-dependent. The effects of a high dose of parenchymal cell conditioned medium (dilution 1:2 containing less than 2.5 ng/ml insulin-like growth factor-1) were additive to that of high doses (100 ng/ml) of insulin-like growth factor-1 or des (1–3) insulin-like growth factor-1, an analogue with low affinity to insulin-like growth factor binding proteins. Neither parenchymal cell conditioned medium nor insulin-like growth factor-1 enhanced transforming growth factor β1 immunoreactivity in the medium. Both parenchymal cell conditioned medium and insulin-like growth factor-1 stimulated DNA synthesis in hepatic stellate cells, confirming previous reports. Conclusions: The present results indicate that both insulin-like growth factor-1 and insulin-like growth factor-1-independent factors from hepatocytes can stimulate hepatocyte growth factor production by hepatic stellate cells. Therefore, insulin-like growth factor-1 and other hepatocyte-derived factors may indirectly affect hepatocytes via a paracrine loop." @default.
• W2032751203 created "2016-06-24" @default.
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• W2032751203 date "1999-01-01" @default.
• W2032751203 modified "2023-10-18" @default.
• W2032751203 title "Hepatocyte-stimulated expression of hepatocyte growth factor (HGF) in cultured rat hepatic stellate cells" @default.
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• W2032751203 doi "https://doi.org/10.1016/s0168-8278(99)80015-4" @default.
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