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Ectopic and IFN-induced expression of Fas overcomes resistance to Fas-mediated apoptosis in multiple myeloma cells.
Uppsala universitet, Medicinska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi. Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär cellbiologi.
Uppsala universitet, Medicinska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi. Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär cellbiologi.
Uppsala universitet, Medicinska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi. Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär cellbiologi.
Uppsala universitet, Medicinska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi. Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär cellbiologi.
Vise andre og tillknytning
2005 (engelsk)Inngår i: Blood, ISSN 0006-4971Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

sted, utgiver, år, opplag, sider
2005.
Emneord [en]
Neoplasi, Multipelt Myelom, Interferon, Stat, Fas, Apoptos
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-73137DOI: doi:10.1182/blood-2004-04-1322PubMedID: 15860671OAI: oai:DiVA.org:uu-73137DiVA, id: diva2:101048
Tilgjengelig fra: 2007-04-13 Laget: 2007-04-13 Sist oppdatert: 2018-01-14

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