FIG. 6.
Enhancement of HIV-1-induced syncytium formation by the activated state of LFA-1 is also seen with monocytoid cells acutely infected with HIV-1. Untreated or NKI-L16-pretreated 1G5 cells were incubated for 12 or 24 h with an equal number of monocytoid U937 cells acutely infected with HIV-1. After lysis, the samples were measured for luciferase activity with a Dynex luminometer. The results are shown as the mean ± SD for samples studied in triplicate.