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Zhonghua Gan Zang Bing Za Zhi. 2008 Jun;16(6):449-52.

[Effects of lipid rafts on signal transmembrane transduction mediated by c-Met].

[Article in Chinese]

Author information

1
Department of Biochemistry and Molecular Biology, Dalian Medical University, Dalian 116044, China.

Abstract

OBJECTIVE:

To study the effects of lipid rafts on cell signal transmembrane transduction mediated by c-Met.

METHODS:

After HepG2Cells were treated with MbCD to disrupt the lipid rafts and were treated with artificial recombination hepatocyte growth factor to activate c-Met, the activities of PLCr1/PKC, PI3K/Akt and MAPK signaling pathways in HepG2 cells were analyzed using Western blot.

RESULTS:

(1) After disruption of lipid rafts with MbCD, phosphorylation of PLCr1 decreased by 35% (P = 0.022); the content of PLCr in the cytoplasm increased by 1.75 fold (P = 0.017); PLCr1 conjugated with membrane decreased by 30% (P = 0.037). (2) The content of PKB in the cytosol decreased by 38% (P = 0.028), and the phosphorylation level of PKB conjugated with membrane decreased by 14% (P = 0.041). At the same time, PDK translocation from cytosol to the plasma membrane and its activation were inhibited by treatment with MbCD. (3) Treatment with MbCD had no significant effect on ErK/MAPK, p38/MAPK and JNK/MAPK signaling pathways.

CONCLUSION:

Disruption of lipid rafts with MbCD inhibits the activation of PLCr1/PKC and PI3K/PKB signaling pathways by HGF/cMet, but has no effect on MAPK signaling pathway.

PMID:
18578997
[Indexed for MEDLINE]

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