Gli family transcription factors are drivers of patupilone resistance in ovarian cancer.

Abstract:

:Epothilones constitute a novel class of antitubulin agents that are active in patients who relapse after treatment with other chemotherapeutics. This study investigated the molecular mechanisms leading to the onset of epothilone-B (patupilone) resistance in ovarian cancer. Results demonstrated that the Gli family of transcription factors was overexpressed in resistant cells and that treatment with a specific Gli1 inhibitor (GANT58) made cells more susceptible to treatment, partially reversing drug resistance. We also demonstrated that Gli1 knockdown halted growth in resistant cells that were exposed to patupilone, confirming that Gli1 is capable of directly mediating epothilone-B resistance. Another observation from our research was that patupilone-resistant cells produced HGF and acquired characteristics of a mesenchymal phenotype. However, HGF silencing alone was not capable of converting the drug-resistant phenotype to a susceptible one, and in this case we demonstrated that Gli1 overexpression led to an increase in HGF, establishing a functional link between Gli1 and HGF. These results demonstrated that Gli1 played a key role in driving resistance to patupilone, suggesting that the combination of epothilones and Gli1-targeted agents could be exploited to improve outcomes in ovarian cancer patients resistant to standard treatments.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Mozzetti S,Martinelli E,Raspaglio G,Prislei S,De Donato M,Filippetti F,Shahabi S,Scambia G,Ferlini C

doi

10.1016/j.bcp.2012.08.019

subject

Has Abstract

pub_date

2012-12-01 00:00:00

pages

1409-18

issue

11

eissn

0006-2952

issn

1873-2968

pii

S0006-2952(12)00575-8

journal_volume

84

pub_type

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