Ontology type: schema:ScholarlyArticle Open Access: True
2010-09-02
AUTHORSC C Jiang, F Lai, K H Tay, A Croft, H Rizos, T M Becker, F Yang, H Liu, R F Thorne, P Hersey, X D Zhang
ABSTRACTBim is known to be critical in killing of melanoma cells by inhibition of the RAF/MEK/ERK pathway. However, the potential role of the most potent apoptosis-inducing isoform of Bim, BimS, remains largely unappreciated. Here, we show that inhibition of the mutant B-RAFV600E triggers preferential splicing to produce BimS, which is particularly important in induction of apoptosis in B-RAFV600E melanoma cells. Although the specific B-RAFV600E inhibitor PLX4720 upregulates all three major isoforms of Bim, BimEL, BimL, and BimS, at the protein and mRNA levels in B-RAFV600E melanoma cells, the increase in the ratios of BimS mRNA to BimEL and BimL mRNA indicates that it favours BimS splicing. Consistently, enforced expression of B-RAFV600E in wild-type B-RAF melanoma cells and melanocytes inhibits BimS expression. The splicing factor SRp55 appears necessary for the increase in BimS splicing, as SRp55 is upregulated, and its inhibition by small interfering RNA blocks induction of BimS and apoptosis induced by PLX4720. The PLX4720-induced, SRp55-mediated increase in BimS splicing is also mirrored in freshly isolated B-RAFV600E melanoma cells. These results identify a key mechanism for induction of apoptosis by PLX4720, and are instructive for sensitizing melanoma cells to B-RAFV600E inhibitors. More... »
PAGESe69-e69
http://scigraph.springernature.com/pub.10.1038/cddis.2010.48
DOIhttp://dx.doi.org/10.1038/cddis.2010.48
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/21364673
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