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• W1578312269 startingPage "863" @default.
• W1578312269 abstract "The decline in CD4/CD8 ratios in lymph nodes (LNs) of SIV macaques and HIV-infected individuals occurs later than that in blood. In a previous study, long-term SIV-infected macaques were delineated into two groups: (1) those whose LNs had normal CD4/CD8 ratios and (2) those whose LNs had low CD4/CD8 ratios. In the present investigation, LNs, spleens, and blood from these groups have been further analyzed to ascertain the cellular and virological events, particularly those involving CD8+ cells, that occur concomitantly with LN CD4% decline. An increase in the percent of CD69-, IL-2R(p75)-, CD45RA1o CD8+ cells was the most constant event observed in lymphoid tissue from mid- to late-stage SIV-infected monkeys. Such cells were sometimes observed in LNs prior to any other immunological or morphological changes. However, decline in LN CD4/CD8 ratios and the associated degeneration of follicular dendritic cells (FDCs) in the germinal centers (GCs) of these nodes were observed only when both CD8+ cell infiltration of GCs and accumulation of viral antigens within the FDC network could be demonstrated. These dramatic changes were also associated with significantly reduced responsiveness to mitogens throughout the lymphoid compartment. In terms of viral burden, immunological and structural collapse of LNs was not always associated with increased viral DNA levels. Despite the CD4+ cell decline in blood during HIV and SIV infections, the immunological and architectural collapse of the lymphoid compartment, which comprises the bulk of the lymphocytes in the body, appears to be a critical event leading to the onset of AIDS. The present findings suggest that increased CD8+ cell activity as well as decrease in CD4+ cell function both contribute to this process." @default.
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• W1578312269 date "1994-07-01" @default.
• W1578312269 modified "2023-09-25" @default.
• W1578312269 title "Immunological and Virological Changes Associated with Decline in CD4/CD8 Ratios in Lymphoid Organs of SIV-Infected Macaques" @default.
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• W1578312269 doi "https://doi.org/10.1089/aid.1994.10.863" @default.
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