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 Resjournal_title
Cancer researchauthors
Raspaglio G,De Maria I,Filippetti F,Martinelli E,Zannoni GF,Prislei S,Ferrandina G,Shahabi S,Scambia G,Ferlini Cdoi
10.1158/0008-5472.CAN-09-4656subject
Has Abstractpub_date
2010-07-15 00:00:00pages
5891-900issue
14eissn
0008-5472issn
1538-7445pii
0008-5472.CAN-09-4656journal_volume
70pub_type
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