Title : EGF- and CPA-induced mitogenic stimuli are differentially down-regulated by TGF-beta1 in cultured rat hepatocytes.

Pub. Date : 1997 May

PMID : 9163675






5 Functional Relationships(s)
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1 EGF- and CPA-induced mitogenic stimuli are differentially down-regulated by TGF-beta1 in cultured rat hepatocytes. Cyproterone Acetate transforming growth factor, beta 1 Rattus norvegicus
2 The corresponding down-regulation of CPA-induced PCNA expression required a 3- to 5-fold higher TGF-beta1 concentration than for EGF-induced expression. Cyproterone Acetate transforming growth factor, beta 1 Rattus norvegicus
3 In contrast, CPA-exposed hepatocytes become vulnerable to and EGF-exposed cells protected against the apoptosis-inducing activity of TGF-beta1 (>0.1 ng/ml). Cyproterone Acetate transforming growth factor, beta 1 Rattus norvegicus
4 It is concluded that EGF and CPA induce their growth stimuli preferentially in the periportal area of the liver but in different hepatocyte sub-populations, which differ in their down-regulation of premitotic events by TGF-beta1. Cyproterone Acetate transforming growth factor, beta 1 Rattus norvegicus
5 At low TGF-beta1 concentrations, EGF-stimulated cells shift back into a resting cell cycle phase, whereas CPA-treated hepatocytes are eliminated by apoptosis at higher TGF-beta1 concentrations. Cyproterone Acetate transforming growth factor, beta 1 Rattus norvegicus