HER2 signaling enhances 5'UTR-mediated translation of c-Myc mRNA.

Abstract:

:The increased levels of c-Myc protein observed previously in an ovarian carcinoma cell line stably transfected to express HER2 has suggested a role for the HER2 pathway in c-Myc expression. Analysis of HER2-transfected cells stimulated with heregulin beta1 (HRG) revealed increased c-Myc protein levels but not a corresponding increase in c-Myc mRNA expression or any change in c-Myc protein half-life. Transfection of HER2-overexpressing cells with a construct containing the 5' untranslated region (5'UTR) of c-Myc mRNA originated from the P2 promoter and placed upstream of the Renilla luciferase gene, enhanced reporter expression upon stimulation with HRG. The HRG-mediated increase in reporter activity correlated with the HRG-mediated induction observed for c-Myc protein, identifying the P2-derived leader (P2L) of c-Myc mRNA as the cis-element involved in c-Myc translational induction. Both the increase in c-Myc protein levels and P2L-enhanced translational activity were inhibited by the PI3K inhibitor wortmannin. Together, these results demonstrate that HRG stimulation of HER2 overexpressing cells leads to enhanced c-Myc protein synthesis through activation of the PI3K/Akt/mTOR pathway and that the P2L of c-Myc mRNA is the element responsible for induction of c-Myc translation.

journal_name

J Cell Physiol

authors

Galmozzi E,Casalini P,Iorio MV,Casati B,Olgiati C,Ménard S

doi

10.1002/jcp.20012

keywords:

subject

Has Abstract

pub_date

2004-07-01 00:00:00

pages

82-8

issue

1

eissn

0021-9541

issn

1097-4652

journal_volume

200

pub_type

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