Transcriptional regulation of IRS5/DOK4 expression in non-small-cell lung cancer cells.

Abstract:

:The insulin-receptor substrate family plays important roles in cellular growth, signaling, and survival. Two new members of this family have recently been isolated: IRS5/Dok4 and IRS6/Dok5. This study examines the expression of IRS5/DOK4 in a panel of lung cancer cell lines and tumor specimens. The results demonstrate that expression of IRS5/DOK4 is frequently altered with both elevated and decreased expression in non-small-cell lung cancer (NSCLC) tumor specimens. The altered expression of IRS5/DOK4 observed in tumor samples is not due to aberrant methylation. In vitro cell culture studies demonstrate that treatment of NSCLC cell lines with the histone deacetylase inhibitor trichostatin A (TSA) upregulates IRS5/DOK4. This finding indicates that expression is regulated epigenetically at the level of chromatin remodeling. Chromatin immunoprecipitation experiments confirm that the IRS5/DOK4 promoter has enhanced histone hyperacetylation following treatments with TSA. Finally, hypoxia was demonstrated to downregulate IRS5/DOK4 expression. This expression was restored by TSA. The clinical relevance of altered IRS5/DOK4 expression in NSCLC requires further evaluation.

journal_name

Clin Lung Cancer

journal_title

Clinical lung cancer

authors

Gray SG,Al-Sarraf N,Baird AM,Gately K,McGovern E,O'Byrne KJ

doi

10.3816/CLC.2008.n.053

subject

Has Abstract

pub_date

2008-11-01 00:00:00

pages

367-74

issue

6

eissn

1525-7304

issn

1938-0690

pii

S1525-7304(11)70242-X

journal_volume

9

pub_type

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