HIV-1 inhibits CD1d surface expression in DCs. (A-B) Human immature DCs were infected with HIV-1 BaL, stained for CD1d surface expression and intracellular expression of p24 at day 7 after infection, and analyzed by flow cytometry. CD1d MFI was calculated for infected (p24⁺; dashed black line) and uninfected (p24⁻; solid black line) cells in the culture, and for MOCK-infected cells (gray solid line). The vertical line in the dot plot indicates CD1d MFI of the p24⁻ DC population. Data in panel B show 10 experiments with DCs from different donors. ***P < .001.