Inhibition of PI3-kinase sensitises HL60 human ...

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Title Inhibition of PI3-kinase sensitises HL60 human leukaemia cells to both chemotherapeutic drug- and Fas-induced apoptosis by a JNK independent pathway
Author(s) D. M. O'Gorman, Shawn L. McKenna, A. J. McGahon, T. G. Cotter
Journal Leukemia Research
Date 2001
Volume 25
Issue 9
Start page 801
End page 811
Abstract Increasing resistance to chemotherapeutic regimes remains a serious problem in the treatment of acute myeloid leukaemia. We have shown that phosphatidylinositol (PI) 3-kinase inhibition significantly sensitises the AML derived cell line, HL60 to chemotherapeutic drug- and Fas-induced apoptosis. PI3-kinase inhibition significantly potentiates cytotoxic drug-induced c-jun N-terminal kinase (JNK) activation, reported to be a requirement for apoptosis. However, JNK inhibition does not enhance cell viability following treatment with drug and inhibitor. Furthermore, PI3-kinase inhibition significantly increases sensitivity to apoptosis mediated by an exogenous receptor agonist, again by a JNK independent mechanism. These results suggest that PI3-kinase inhibitors could be of significant therapeutic importance, lowering the threshold for apoptosis induced by both chemotherapy and cell-mediated immune response.

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