OBJECTIVE: To analyse the role of the apoptosis-inducing Fas receptor in the depletion of CD4+ and CD8+ T cells in HIV-infected individuals. METHODS: Peripheral blood lymphocytes (PBL) obtained from HIV-infected subjects of all 1993 Centers for Disease Control and Prevention (CDC) stages and from non-infected controls were examined. A two-colour cytofluorometry was employed using monoclonal antibodies against Fas receptor (CD95) in combination with the surface markers CD4, CD8, CD28, CD26 and CD45RO. CD4+ and CD8+ T-cell-enriched PBL were used as target cells to assess their susceptibility to lysis by CD4+ cytotoxic T lymphocytes (CTL) which kill via the Fas pathway. RESULTS: Fas+PBL are more elevated in HIV-infected individuals than in HIV-negative controls and increase significantly from CDC stages A to C. Whereas Fas+CD4+ and Fas-CD4+ T-cell populations decline in parallel with the progression of HIV infection, the Fas+CD8+, but not of the Fas-CD8+ fraction, significantly increases. The Fas+CD8+ lymphocytes are susceptible to Fas-mediated lysis as they are efficiently killed by Fas-ligand+CD4+CTL. CONCLUSION: The Fas receptor may contribute, but not as a unique cause, to the decline of CD4+ T cells in HIV-infected individuals. This and the significant increase of the number of Fas+ CD8+ T cells indicates that Fas-mediated immune regulation is disturbed.
OBJECTIVE: To analyse the role of the apoptosis-inducing Fas receptor in the depletion of CD4+ and CD8+ T cells in HIV-infected individuals. METHODS: Peripheral blood lymphocytes (PBL) obtained from HIV-infected subjects of all 1993 Centers for Disease Control and Prevention (CDC) stages and from non-infected controls were examined. A two-colour cytofluorometry was employed using monoclonal antibodies against Fas receptor (CD95) in combination with the surface markers CD4, CD8, CD28, CD26 and CD45RO. CD4+ and CD8+ T-cell-enriched PBL were used as target cells to assess their susceptibility to lysis by CD4+ cytotoxic T lymphocytes (CTL) which kill via the Fas pathway. RESULTS:Fas+PBL are more elevated in HIV-infected individuals than in HIV-negative controls and increase significantly from CDC stages A to C. Whereas Fas+CD4+ and Fas-CD4+ T-cell populations decline in parallel with the progression of HIV infection, the Fas+CD8+, but not of the Fas-CD8+ fraction, significantly increases. The Fas+CD8+ lymphocytes are susceptible to Fas-mediated lysis as they are efficiently killed by Fas-ligand+CD4+CTL. CONCLUSION: The Fas receptor may contribute, but not as a unique cause, to the decline of CD4+ T cells in HIV-infected individuals. This and the significant increase of the number of Fas+ CD8+ T cells indicates that Fas-mediated immune regulation is disturbed.
Authors: Y Sasaki; Y Ami; T Nakasone; K Shinohara; E Takahashi; S Ando; K Someya; Y Suzaki; M Honda Journal: Clin Exp Immunol Date: 2000-12 Impact factor: 4.330
Authors: P J Blair; L H Boise; S P Perfetto; B L Levine; G McCrary; K F Wagner; D C St Louis; C B Thompson; J N Siegel; C H June Journal: J Clin Immunol Date: 1997-05 Impact factor: 8.317
Authors: Emmanouil Papasavvas; Elizabeth C Moore; Junwei Sun; Livio Azzoni; Maxwell Pistilli; Karam Mounzer; Jane Shull; Jay R Kostman; Luis J Montaner Journal: AIDS Res Hum Retroviruses Date: 2008-09 Impact factor: 2.205
Authors: P G Conaldi; L Biancone; A Bottelli; A Wade-Evans; L C Racusen; M Boccellino; V Orlandi; C Serra; G Camussi; A Toniolo Journal: J Clin Invest Date: 1998-12-15 Impact factor: 14.808