HuR regulates beta-tubulin isotype expression in ovarian cancer.

Abstract:

:The supply of oxygen and nutrients to solid tumors is inefficient because cancer tissues have an inadequate number of microvessels, thus inducing the selective growth of the most aggressive cancer cells. This explains why many of the factors underlying a poor prognosis are induced in hypoxic/hypoglycemic conditions. Among these factors, a prominent role in several solid tumors is played by the class III beta-tubulin gene (TUBB3). The study described here reveals that glucose deprivation enhances TUBB3 expression at both the gene and protein levels in A2780 ovarian cancer cells. In silico analysis of TUBB3 mRNA sequence predicted a putative binding site for the RNA-binding protein Hu antigen (HuR) in the 3' flanking untranslated region. A hypoglycemic-dependent engagement of this site was shown using RNA pull-down and ribonucleoimmunoprecipitation techniques. Thereafter, HuR gene silencing revealed that TUBB3 translation is HuR dependent in hypoglycemia because HuR silencing inhibited the entry of TUBB3 mRNA into cytoskeletal and free polysomes. Finally, the clinical value of this finding was assessed in a clinical cohort of 46 ovarian cancer patients in whom it was found that HuR cytoplasmic staining was associated with high levels of TUBB3 and poor survival.

journal_name

Cancer Res

journal_title

Cancer research

authors

Raspaglio G,De Maria I,Filippetti F,Martinelli E,Zannoni GF,Prislei S,Ferrandina G,Shahabi S,Scambia G,Ferlini C

doi

10.1158/0008-5472.CAN-09-4656

subject

Has Abstract

pub_date

2010-07-15 00:00:00

pages

5891-900

issue

14

eissn

0008-5472

issn

1538-7445

pii

0008-5472.CAN-09-4656

journal_volume

70

pub_type

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