The ERK1/2 pathway modulates nuclear PTEN-mediated cell cycle arrest by cyclin D1 transcriptional regulation.

Abstract:

:PTEN, a tumor suppressor phosphatase that dephosphorylates both protein and lipid substrates, is mutated in both heritable and sporadic breast cancer. Until recently, PTEN-mediated cell cycle arrest and apoptosis were thought to occur through its well-documented cytoplasmic activities. We have shown that PTEN localizes to the nucleus coincident with the G0-G1 phases of the cell cycle and that compartmentalization may regulate cell cycle progression dependent upon the down-regulation of cyclin D1. However, the mechanism for cyclin D1-dependent growth suppression by nuclear PTEN has remained largely undefined. Utilizing MCF-7 Tet-Off breast cancer cell lines stably expressing two different nuclear localization defective PTEN mutants, as well as wild-type PTEN and empty vector control cells, we demonstrate that nuclear PTEN down-regulates cyclin D1 transcription and this event is mediated by the down-regulation of MAPK specifically by nuclear localized PTEN. These results provide further evidence that nuclear PTEN plays a role through cell cycle suppression functions in regulating carcinogenesis.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Chung JH,Ostrowski MC,Romigh T,Minaguchi T,Waite KA,Eng C

doi

10.1093/hmg/ddl177

subject

Has Abstract

pub_date

2006-09-01 00:00:00

pages

2553-9

issue

17

eissn

0964-6906

issn

1460-2083

pii

ddl177

journal_volume

15

pub_type

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