Abstract
The lambda interferons (IL-28a, 28b, and IL-29) inhibit the replication of many viruses, but their role in the inhibition of HIV-1 infection remains unclear. During this study, we monitored IL-29 production in HIV-1 infected individuals and analyzed the in vitro and in vivo inhibition of HIV-1 production. Prior treatment with IL-28a or IL-29 induced an antiviral state in cultured primary T-cells, which suppressed HIV-1 integration and post-transcriptional events. The antiviral factors MxA, OAS, and PKR were up-regulated. In HIV-1 infected patients, IL-29 level was increased along with the depletion of CD4⁺ T-cells in peripheral blood, while the elevated IL-29 did not show a significantly negative correlation with viral load. Further analysis of HIV-1 infected individuals showed that IL-29 was positively correlated with IFN-β and anti-inflammatory cytokine IL-10, and was negatively correlated with IFN-γ, which might suggest that IFN-λ participates in modulating antiviral immune responses during HIV-1 infection in vivo. Together, although IFN-λ impeded HIV-1 infection of T-cells in vitro, IFN-λ showed only limited in vivo repression of viral production. The modulation of IFN-λ on inflammatory factors might be worthy for further c...Continue Reading
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