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Träfflista för sökning "WFRF:(Öberg Fredrik) ;pers:(Osterborg Anders)"

Sökning: WFRF:(Öberg Fredrik) > Osterborg Anders

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  • Dimberg, Lina, et al. (författare)
  • Ectopic and IFN-induced expression of Fas overcomes resistance to Fas-mediated apoptosis in multiple myeloma cells.
  • 2005
  • Ingår i: Blood. - : American Society of Hematology. - 0006-4971 .- 1528-0020.
  • Tidskriftsartikel (refereegranskat)abstract
    • Multiple myeloma (MM) is an as yet incurable B cell malignancy. Increased survival in vitro is a hallmark of MM cells, implying that a therapeutic potential may lie in circumventing anti-apoptotic signals. We have previously reported that interferons (IFNs) sensitize MM cells to Fas/CD95-mediated apoptosis (1). In the present study, we explore the mechanism underlying this effect. In a wide screening of apoptosis-related genes, Apo2L/TRAIL and Fas were identified as IFN-targets. Sensitization to Fas-mediated apoptosis by IFNs was not affected by blocking Apo2L/TRAIL, suggesting that Apo2L/TRAIL is not a key mediator in this process. In contrast, we found that an elevated Fas expression was functionally linked to increased susceptibility to Fas-mediated apoptosis. This was further supported by the finding that IFN-treatment enhanced Fas-mediated caspase-8 activation, one of the earliest signaling events down-stream receptor activation. In addition, IFN treatment attenuated the IL-6 dependent activation of Stat3, interfering with a known survival-pathway in MM that has previously been linked with resistance to Fas-mediated apoptosis. Taken together, our results show that IFN-induced up-regulation of Fas sensitizes MM cells to Fas-mediated apoptosis and suggest that attenuation of Stat3 activation may be a potentially important event in this process.
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