Characterization of CD8+ T‐cell responses in HIV‐1‐exposed seronegative commercial sex workers from Nairobi, Kenya

JB Alimonti, J Kimani, L Matu, C Wachihi… - Immunology and cell …, 2006 - Wiley Online Library
JB Alimonti, J Kimani, L Matu, C Wachihi, R Kaul, FA Plummer, KR Fowke
Immunology and cell biology, 2006Wiley Online Library
CD8+ T‐lymphocyte responses are crucial to the control of HIV‐1; therefore, studying the
CD8+ immune response in a naturally resistant population could provide valuable insights
into an effective anti‐HIV response in healthy uninfected individuals. Approximately 5–10%
of the women in the Pumwani Commercial Sex Worker cohort in Nairobi, Kenya, have been
highly exposed to HIV‐1 yet remain HIV‐IgG‐seronegative and HIV‐PCR negative (HIVES).
As IFN‐γ production correlates to cytotoxic function, the CD8+ T‐lymphocyte IFN‐γ response …
CD8+ T‐lymphocyte responses are crucial to the control of HIV‐1; therefore, studying the CD8+ immune response in a naturally resistant population could provide valuable insights into an effective anti‐HIV response in healthy uninfected individuals. Approximately 5–10% of the women in the Pumwani Commercial Sex Worker cohort in Nairobi, Kenya, have been highly exposed to HIV‐1 yet remain HIV‐IgG‐seronegative and HIV‐PCR negative (HIVES). As IFN‐γ production correlates to cytotoxic function, the CD8+ T‐lymphocyte IFN‐γ response to HIV p24 peptides was compared in HIVES and HIV‐infected (HIV+) individuals. Almost 40% of the HIVES had a CD8+ IFN‐γ+ response that was five times lower in magnitude than that of the HIV+ group. The breadth of the response in HIVES was very narrow and focused primarily on one peptide that is similar to the protective KK10 peptide. In the HIV+ group, low peripheral CD4+ counts negatively influenced the number of CD8+ cells producing IFN‐γ, which may undermine the ability to control HIV. Overall, many of the HIVES women possess a HIV‐1 p24‐specific CD8+ IFN‐γ response, providing evidence to the specificity needed for an effective HIV vaccine.
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