IGF-1 induces Pin1 expression in promoting cell cycle S-phase entry.

Abstract:

:Insulin-like growth factor I (IGF-1) is a well-established mitogen to many different cell types and is implicated in progression of a number of human cancers, notably breast cancer. The prolyl isomerase Pin1 plays an important role in cell cycle regulation through its specific interaction with proteins that are phosphorylated at Ser/Thr-Pro motifs. Pin1 knockout mice appear to have relatively normal development yet the Pin1(-/-)mouse embryo fibroblast (MEF) cells are defective in re-entering cell cycle in response to serum stimulation after G0 arrest. Here, we report that Pin1(-/-) MEF cells display a delayed cell cycle S-phase entry in response to IGF stimulation and that IGF-1 induces Pin1 protein expression which correlates with the induction of cyclin D1 and RB phosphorylation in human breast cancer cells. The induction of Pin1 by IGF-1 is mediated via the phosphatidylinositol 3-kinase as well as the MAP kinase pathways. Treatment of PI3K inhibitor LY294002 and the MAP kinase inhibitor PD098059, but not p38 inhibitor SB203580, effectively blocks IGF-1-induced upregulation of Pin1, cyclin D1 and RB phosphorylation. Furthermore, we found that Cyclin D1 expression and RB phosphorylation are dramatically decreased in Pin1(-/-) MEF cells. Reintroducing a recombinant adenovirus encoding Pin1 into Pin1(-/-) MEF cells restores the expression of cyclin D1 and RB phosphorylation. Thus, these data suggest that the mitogenic function of IGF-1 is at least partially linked to the induction of Pin1, which in turn stimulates cyclin D1 expression and RB phosphorylation, therefore contributing to G0/G1-S transition.

journal_name

J Cell Biochem

authors

You H,Zheng H,Murray SA,Yu Q,Uchida T,Fan D,Xiao ZX

doi

10.1002/jcb.10037

subject

Has Abstract

pub_date

2002-01-01 00:00:00

pages

211-6

issue

2

eissn

0730-2312

issn

1097-4644

pii

10.1002/jcb.10037

journal_volume

84

pub_type

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