Abstract:
BACKGROUND:Malignant Pleural Mesothelioma (MPM) is an aggressive tumor arising from mesothelial cells lining the pleural cavities characterized by resistance to standard therapies. Most of the molecular steps responsible for pleural transformation remain unclear; however, several growth factor signaling cascades are known to be altered during MPM onset and progression. Transducers of these pathways, such as PIK3CA-mTOR-AKT, MAPK, and ezrin/radixin/moesin (ERM) could therefore be exploited as possible targets for pharmacological intervention. This study aimed to identify 'druggable' pathways in MPM and to formulate a targeted approach based on the use of commercially available molecules, such as the multikinase inhibitor sorafenib and the mTOR inhibitor everolimus. METHODS:We planned a triple approach based on: i) analysis of immunophenotypes and mutational profiles in a cohort of thoracoscopic MPM samples, ii) in vitro pharmacological assays, ii) in vivo therapeutic approaches on MPM xenografts. No mutations were found in 'hot spot' regions of the mTOR upstream genes (e.g. EGFR, KRAS and PIK3CA). RESULTS:Phosphorylated mTOR and ERM were specifically overexpressed in the analyzed MPM samples. Sorafenib and everolimus combination was effective in mTOR and ERM blockade; exerted synergistic effects on the inhibition of MPM cell proliferation; triggered ROS production and consequent AMPK-p38 mediated-apoptosis. The antitumor activity was displayed when orally administered to MPM-bearing NOD/SCID mice. CONCLUSIONS:ERM and mTOR pathways are activated in MPM and 'druggable' by a combination of sorafenib and everolimus. Combination therapy is a promising therapeutic strategy against MPM.
journal_name
BMC Cancerjournal_title
BMC cancerauthors
Pignochino Y,Dell'Aglio C,Inghilleri S,Zorzetto M,Basiricò M,Capozzi F,Canta M,Piloni D,Cemmi F,Sangiolo D,Gammaitoni L,Soster M,Marchiò S,Pozzi E,Morbini P,Luisetti M,Aglietta M,Grignani G,Stella GMdoi
10.1186/s12885-015-1363-1subject
Has Abstractpub_date
2015-05-08 00:00:00pages
374issn
1471-2407pii
10.1186/s12885-015-1363-1journal_volume
15pub_type
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