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research
Effects of rapamycin on cultured hepatocyte proliferation and gene expression
Authors
A Azzarone
BI Carr
+4 more
G Carrieri
A Francavilla
TE Starzl
Q‐ Zeng
Publication date
1 January 1992
Publisher
'Wiley'
Doi
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PubMed
Abstract
Rapamycin, a potent immunosuppressive drug that disrupts normal signal‐transduction processes, inhibited hepatocyte proliferation without evidence of inherent cytotoxicity in rat hepatocytes cultured in conventional medium or in a medium enriched with epidermal growth factor. The antiproliferative effect was dose dependent, uninfluenced by the concentration of epidermal growth factor in the medium and long lasting after a brief exposure. The effect of rapamycin was unaltered by the concomitant presence of FK 506 in the medium, suggesting that different binding affinities of these two drugs or even a separate rapamycin binding site may exist. Hepatocytes harvested 12 and 24 hr after partial hepatectomy were progressively less responsive to the antiproliferative effect of rapamycin. The gene expression of transforming growth factor‐β was reduced under in vivo rapamycin treatment, but at the same time the gene expression of albumin and glyceraldehyde‐3‐phosphate dehydrogenase was unchanged or increased. The experiments confirm that rapamycin has inherent growth‐control qualities, and they strengthen the hypothesis that the recently defined immunophilin network is central to many aspects of cellular growth control. (HEPATOLOGY 1992;15:871–877). Copyright © 1992 American Association for the Study of Liver Disease
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