Abstract:
:The interaction of cancer cells with extracellular matrix (ECM) is important in metastasization. Here we identified the molecules of the ECM expressed by sarcomatous malignant mesothelioma, and their effect on adhesion and spreading. In addition, by analyzing the relationship between translation and attachment to matrix, we found that mesothelioma cells rely on continuing translation to efficiently attach to matrix, and rapamycin inhibition affects spreading and migration of cancer cells. Specifically, we found that sarcomatous cells produce high amounts of fibronectin, able to support the spreading of mesothelioma cells. Spreading of cancer cells on fibronectin does not require de novo transcription but is sensitive to cycloheximide, an inhibitor of protein synthesis. Next, we analyzed the involvement of the mammalian target of rapamycin (mTOR) pathway, a major pathway controlling translation. Cancer cells have a constitutively active mTOR pathway; surprisingly, inhibition of mTOR complex 1 (mTORC1) by rapamycin barely affects the global rate of translation and of initiation of translation, but deeply inhibits mesothelioma spreading on ECM. The effects of rapamycin and cycloheximide on spreading were observed in several mesothelioma cell lines, although with different magnitude. Overall, data suggest that adhesion and spreading of mesothelioma cells on ECM require the translation of pre-synthesized mRNAs, and mTORC1 activity. We speculate that mTORC1 activity is required either for the translation of specific mRNAs or for the direct modulation of cytoskeletal remodeling.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Ranzato E,Grosso S,Patrone M,Betta PG,Viarengo A,Biffo Sdoi
10.1002/jcb.22316subject
Has Abstractpub_date
2009-11-01 00:00:00pages
867-76issue
4eissn
0730-2312issn
1097-4644journal_volume
108pub_type
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