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. 1996 Dec;70(12):8758–8764. doi: 10.1128/jvi.70.12.8758-8764.1996

Macrophages and CD4+ T lymphocytes from two multiply exposed, uninfected individuals resist infection with primary non-syncytium-inducing isolates of human immunodeficiency virus type 1.

R I Connor 1, W A Paxton 1, K E Sheridan 1, R A Koup 1
PMCID: PMC190972  PMID: 8971004

Abstract

Despite multiple, high-risk sexual exposures, some individuals remain uninfected with human immunodeficiency virus type 1 (HIV-1). CD4+ lymphocytes from these individuals are less susceptible to infection in vitro with some strains of HIV-1, suggesting that the phenotype of the virus may influence its ability to interact with certain CD4+ cells. In the present study, we examined the susceptibility of CD4+ T lymphocytes and macrophages from two exposed uninfected individuals (EU2 and EU3) to infection with a panel of biologically cloned isolates of HIV-1 having either a non-syncytium-inducing (NSI) or a syncytium-inducing (SI) phenotype. Our results indicate that CD4+ T lymphocytes from EU2 and EU3 are resistant to infection with NSI isolates of HIV-1 but are susceptible to infection with primary SI isolates. In addition, we found that macrophages from EU2 and EU3 are resistant to infection with both NSI and SI isolates. The latter finding was confirmed by using several uncloned NSI and SI isolates obtained from patients during acute HIV-1 infection. In further experiments, env clones encoding glycoproteins characteristic of NSI or SI viruses were used in single-cycle infectivity assays to evaluate infection of CD4+ lymphocytes and macrophages from EU2 and EU3. Consistent with our previous results, we found that macrophages from these individuals are resistant to infection with NSI and SI env-pseudotyped viruses, while CD4+ T lymphocytes are resistant to NSI, but not SI, pseudotyped viruses. Overall, our results demonstrate that CD4+ cells from two exposed uninfected individuals resist infection in vitro with primary, macrophage-tropic, NSI isolates of HIV-1, which is the predominant viral phenotype found following HIV-1 transmission. Furthermore, infection with NSI isolates was blocked in both CD4+ T lymphocytes and macrophages from these individuals, suggesting that there may be a common mechanism for resistance in both cell types.

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Selected References

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