Reduced CD4 T Cell Activation and Susceptibility to HIV-1 in Central African Exposed Uninfected Individuals
Author Information
Author(s): Bégaud Evélyne, Chartier Loïc, Marechal Valéry, Ipero Julienne, Léal Josianne, Versmisse Pierre, Breton Guillaume, Fontanet Arnaud, Capoulade-Metay Corinne, Fleury Hervé, Barré-Sinoussi Françoise, Scott-Algara Daniel, Pancino Gianfranco
Primary Institution: Institut Pasteur, Bangui, CAR
Hypothesis
Are lower levels of CD4 T cell activation and reduced susceptibility to HIV-1 infection related to resistance in exposed uninfected individuals?
Conclusion
The study found low levels of CD4 T cell activation and reduced susceptibility to HIV-1 infection in Central African exposed uninfected individuals.
Supporting Evidence
- Exposed uninfected individuals had lower levels of HLA-DR+CD4 T cells compared to low-risk controls.
- CCR5 expression on CD4 T cells was significantly lower in exposed uninfected individuals.
- PBMC from exposed uninfected individuals showed reduced susceptibility to HIV-1 infection in vitro.
- Levels of MIP-1β were higher in exposed uninfected individuals than in low-risk controls.
Takeaway
Some people in Central Africa can have unprotected sex with HIV-infected partners and not get infected themselves because their immune system is less activated.
Methodology
The study analyzed immune activation markers and susceptibility to HIV-1 infection in exposed uninfected individuals compared to low-risk blood donors.
Limitations
The study did not examine immune activation or HIV-specific responses in other lymphoid compartments, such as the genital mucosa.
Participant Demographics
{"exposed_uninfected":{"male_percentage":45,"female_percentage":55,"median_age":35,"common_life_years":8,"never_using_condom_percentage":84.2,"sti_antecedents_percentage":5.6,"circumcised_men_percentage":81.6},"unexposed_controls":{"male_percentage":73,"female_percentage":27,"median_age":24}}
Statistical Information
P-Value
{"CD4_activation":"p = 0.0001","CCR5_expression":"p = 0.0001","PBMC_infection_X4":"p = 0.02","PBMC_infection_R5":"p = 0.05","MIP-1β":"p = 0.007"}
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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