Manumycin inhibits cell proliferation and the Ras signal transduction pathway in human hepatocellular carcinoma cells.

Abstract:

:Manumycin was reported to have inhibitory effect on farnesyltransferase by competing with the farnesyl pyrophosphate substrate. It exhibited different antiproliferative activity in human hepatocellular carcinoma HepG2 cells, primary cultured human cardiac muscle cells and human liver cells (CLC). HepG2 cells overexpressing ras gene were more sensitive to manumycin than the other cells. The difference might be related to Ras protein levels in these cell lines. Manumycin reduced the amount of functional ras localized at the cytoplasmic membrane, resulting in blocked C-raf-1 assocation with Ras. Manumycin inhibited ERK1/2 phosphorylation in HepG2 cells without reduced expression of ERK1/2 protein. The levels of protein MKP-1 were significantly up-regulated. Our study also demonstrated that manumycin inhibited p85/PI3K and Akt phosphorylation without reduced expression of p85/PI3K and Akt, and interfered with the association of p85/PI3K and Ras. These findings indicated that manumycin interfered with Ras membrane localization, shut down the downstream pathways of Ras and inhibited cell proliferation in HepG2 cells.

journal_name

Int J Mol Med

authors

Zhou JM,Zhu XF,Pan QC,Liao DF,Li ZM,Liu ZC

subject

Has Abstract

pub_date

2003-06-01 00:00:00

pages

767-71

issue

6

eissn

1107-3756

issn

1791-244X

journal_volume

11

pub_type

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