Overexpression of integrin beta1 inhibits proliferation of hepatocellular carcinoma cell SMMC-7721 through preventing Skp2-dependent degradation of p27 via PI3K pathway.

Abstract:

:Integrins may play important roles in many cellular events, such as cell proliferation, differentiation, and apoptosis. We showed previously that overexpression of integrin beta1 inhibits cell proliferation in SMMC-7721 cells. Here we reported that one of the cyclin-dependent kinase (CDK) inhibitors, p27(Kip1) was involved in proliferation-inhibition induced by overexpression of integrin beta1. Overexpression of integrin beta1 upregulated p27(Kip1) at the protein level, but not mRNA level. The knock-down of p27(Kip1) expression restored cell growth in integrin beta1-overexpressing cells. Cycloheximide (Chx) treatment and pulse-chase experiments revealed that overexpression of integrin beta1 prolonged the half-life of p27(Kip1) by inhibiting its degradation. Proteasome inhibitor (MG132) treatment of the cells indicated that proteasome mediated degradation of p27, and Skp2-dependent degradation might be prevented. Overexpression of integrin beta1 decreased Skp2 at mRNA level, which was regulated by cell adhesion and the subsequent adhesion-dependent signaling. Overexpression of integrin beta1 reduced cell adhesion, accordingly, inactivated the phosphoinositide 3-kinase (PI3K) signaling. PI3K inhibitor LY294002 upregulated p27(Kip1) at post-translational level and downregulate Skp2 at mRNA level, which could mimic the effects of integrin beta1 overexpression on p27(Kip1) and Skp2. Together, these results suggested that overexpression of integrin beta1 inhibited cell proliferation by preventing the Skp2-dependent degradation of p27(Kip1) via PI3K pathway.

journal_name

J Cell Biochem

authors

Fu Y,Fang Z,Liang Y,Zhu X,Prins P,Li Z,Wang L,Sun L,Jin J,Yang Y,Zha X

doi

10.1002/jcb.21323

subject

Has Abstract

pub_date

2007-10-15 00:00:00

pages

704-18

issue

3

eissn

0730-2312

issn

1097-4644

journal_volume

102

pub_type

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