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IDENTIFICATION ET CARACTÉRISATION D'UN NOUVEAU MÉCANISME DE RÉSISTANCE AU GEFITINIB DANS LE CANCER DU POUMON NON-À PETITES CELLULES : ROLE DE L'AMPHIRÉGULINE

Abstract : Non-small cell lung cancer (NSCLC) accounts for 80% of lung cancers and is associated with a very poor prognosis, with a 5-year survival rate remaining below 15%. Gefitinib is a molecule that belongs to Epidermal Growth Factor Receptor-Tyrosine Kinase inhibitors (EGFR-TKI) family and has shown potent antiproliferative effects in NSCLC. A high variability in clinical responses to this treatment lead to investigate new predictive markers to discriminate gefitinib-responders from non-responders. Patients that are resistant to gefitinib have high seric amphiregulin (AREG) levels, suggesting a role of this growth factor in gefitinib resistance. We investigated whether AREG was involved in gefitinib resistance and we characterized the molecular pathway initiated by AREG. This work shows that AREG allows resistance to gefitinib-induced apoptosis in vitro and in vivo, through the inactivation of Bax proapoptotic protein. AREG induces the decrease of Bax expression level as well as an increased interaction between Bax and Ku70, through an acetylation-dependant mechanism. Therefore we describe an original pathway of gefitinib resistance, dependant of acetylation, and controlled by the growth factor AREG. Lung cancer is a major health problem and NSCLC resistance to treatments represents a worrying phenomenon for clinicians. This work suggests both diagnostic and therapeutic solutions to improve NSCLC care. Effectively, we demonstrated the major role of AREG in NSCLC resistance to gefitinib, and validated its use as a predictive biomarker of non responsiveness to this treatment. Moreover, we suggest the association of EGFR-TKI with histone deacetylase inhibitors, especially for NSCLC patients that are resistant to EGFR-TKI.
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https://tel.archives-ouvertes.fr/tel-00446892
Contributor : Benoit Busser <>
Submitted on : Tuesday, December 7, 2010 - 6:51:24 PM
Last modification on : Friday, November 6, 2020 - 3:52:39 AM
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Benoit Busser. IDENTIFICATION ET CARACTÉRISATION D'UN NOUVEAU MÉCANISME DE RÉSISTANCE AU GEFITINIB DANS LE CANCER DU POUMON NON-À PETITES CELLULES : ROLE DE L'AMPHIRÉGULINE. Biologie cellulaire. Université Joseph-Fourier - Grenoble I, 2009. Français. ⟨tel-00446892v2⟩

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