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CD20-induced Lymphoma Cell Death Is Independent of Both Caspases and Its Redistribution into Triton X-100 Insoluble Membrane Rafts¹

Tenovus Research Laboratory, Cancer Sciences Division, School of Medicine, General Hospital, Tremona Road, Southampton, SO16 6YD United Kingdom [H. T. C., D. H., R. R. F., A. L. T., C. A. W., M. J. G., M. S. C.], and Genmab, Utrecht, the Netherlands [J. L. T.]

Rituximab is routinely used for the treatment of neoplasia, although the mechanism of action remains uncertain. In the current study, CD20-induced apoptosis was investigated with a panel of anti-CD20 monoclonal antibodies (mAb) in a wide range of cell lines. A hierarchy of mAb activity was apparent, with the B1 mAb generally the most potent. Apoptosis through CD20 was dependent on the nature of mAb binding and correlated with the extent of homotypic cell adhesion induced. However, using anti-CD20 mAb, which vary in the extent to which they redistribute wild-type and mutant CD20 molecules to membrane rafts, we showed that CD20-induced apoptosis was independent of translocation to TX-100 insoluble rafts. Using crmA-transfected cells and caspase inhibitors, we showed that phosphatidylserine translocation and mitochondrial permeability transition evoked during CD20-induced apoptosis appeared caspase independent. Furthermore, in cytoplasts which lack mitochondria and in Bcl₂-transfected cells, phosphatidylserine was still translocated to the cell surface after CD20 stimulation. Together, these data imply that CD20 can evoke apoptosis without the involvement of mitochondria and caspases and irrespective of redistribution into TX-100 insoluble membrane rafts.

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