Apoptotic death of lymphocytes in murine acquired immunodeficiency syndrome: Involvement of Fas‐Fas ligand interaction

Murine acquired immunodeficiency syndrome (MAIDS) is caused by a defective murine leukemia virus. The disease is characterized by abnormal lymphoproliferation, impaired T and B cell function and aberrant regulation of cytokines. Both T and B lymphocytes show activated phenotypes, but undergo apoptotic death with characteristic DNA fragmentation. These results indicate the presence of a continuous activation death pathway of the lymphocytes in MAIDS. Overexpression of the bcl‐2 transgene in lymphocytes showed no effect on the apoptotic cell death or on the development of the disease. In contrast, mice carrying mutations in either Fas or Fas ligand exhibited accelerated progression of the disease upon infection with MAIDS virus. These results suggest the involvement of Fas‐Fas ligand system in the pathogenesis of MAIDS.

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