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Polypyrimidine tract-binding protein enhances the internal ribosomal entry site-dependent translation of p27(Kip1) mRNA and modulates transition from G(1) to S phase SCIE SCOPUS

Title
Polypyrimidine tract-binding protein enhances the internal ribosomal entry site-dependent translation of p27(Kip1) mRNA and modulates transition from G(1) to S phase
Authors
Cho, SCKim, JHBack, SHJang, SK
Date Issued
2005-02
Publisher
AMER SOC MICROBIOLOGY
Abstract
The p27(KiP1) protein plays a critical role in the regulation of cell proliferation through the inhibition of cyclin-dependent kinase activity. Translation of p27(Kip1) is directed by an internal ribosomal entry site (IRES) in the 5' nontranslated region of p27(Kip1) mRNA. Here, we report that polypyrimidine tract-binding protein (PTB) specifically enhances the IRES activity of p27(Kip1) mRNA through an interaction with the IRES element. We found that addition of PTB to an in vitro translation system and overexpression of PTB in 293T cells augmented the IRES activity of p27(Kip1) mRNA but that knockdown of PTB by introduction of PTB-specific small interfering RNAs (siRNAs) diminished the IRES activity of p27(Kip1) mRNA. Moreover, the G, phase in the cell cycle (which is maintained in part by p27(KiP1)) was shortened in cells depleted of PTB by siRNA knockdown. 12-O-Tetradecanoylphorbol-13-acetate (TPA)-induced differentiation in HL60 cells was used to examine PTB-induced modulation of p27(KiP1) protein synthesis during differentiation. The IRES activity of p27(Kip1) mRNA in HL60 cells was increased by TPA treatment (with a concomitant increase in PTB protein levels), but the levels of p27(Kip1) mRNA remained unchanged. Together, these data suggest that PTB modulates cell cycle and differentiation, at least in part, by enhancing the IRES activity of p27(Kip1) mRNA.
URI
https://oasis.postech.ac.kr/handle/2014.oak/11687
DOI
10.1128/MCB.25.4.1283-1297.2005
ISSN
0270-7306
Article Type
Article
Citation
MOLECULAR AND CELLULAR BIOLOGY, vol. 25, no. 4, page. 1283 - 1297, 2005-02
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장승기JANG, SUNG KEY
Dept of Life Sciences
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