hTERT promotes imatinib resistance in chronic myeloid leukemia cells: therapeutic implications.

Abstract:

:Imatinib mesylate has shown remarkable efficacy in the treatment of patients in the chronic phase of chronic myeloid leukemia. However, despite an overall significant hematological and cytogenetic response, imatinib therapy may favor the emergence of drug-resistant clones, ultimately leading to relapse. Some imatinib resistance mechanisms had not been fully elucidated yet. In this study we used sensitive and resistant sublines from a Bcr-Abl positive cell line to investigate the putative involvement of telomerase in the promotion of imatinib resistance. We showed that sensitivity to imatinib can be partly restored in imatinib-resistant cells by targeting telomerase expression, either by the introduction of a dominant-negative form of the catalytic protein subunit of the telomerase (hTERT) or by the treatment with all-trans-retinoic acid, a clinically used drug. Furthermore, we showed that hTERT overexpression favors the development of imatinib resistance through both its antiapoptotic and telomere maintenance functions. Therefore, combining antitelomerase strategies to imatinib treatment at the beginning of the treatment should be promoted to reduce the risk of imatinib resistance development and increase the probability of eradicating the disease.

journal_name

Mol Cancer Ther

authors

Deville L,Hillion J,Pendino F,Samy M,Nguyen E,Ségal-Bendirdjian E

doi

10.1158/1535-7163.MCT-10-0979

subject

Has Abstract

pub_date

2011-05-01 00:00:00

pages

711-9

issue

5

eissn

1535-7163

issn

1538-8514

pii

1535-7163.MCT-10-0979

journal_volume

10

pub_type

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