Figure 4.
Inhibition of transcytosis of infectious HIV-1 by human anti-HIV-1 env IgM monoclonal antibodies. The in vitro neutralizing Human anti-HIV-1 IgM MO101, MO97, and MO99 and the control non-neutralizing MO6 with or without 5 µg/mL rgp160 were added together with HIV-1 SI 6794 infected PBMC during 24 h on the apical side to assess inhibition of HIV-1 transmission/transcytosis from the apical side to the basolateral side across the human epithelial cell line Caco-2-pIgR+. The inhibition of HIV transcytosis was assessed intracellularly in the cells and in the basolateral supernatant by p24 ELISA. (A) The in vitro neutralizing Human anti-HIV-1 IgM MO101 and the control non-neutralizing MO6 with or without rgp160 (p < 0.01), (B) the in vitro neutralizing anti-HIV-1 IgM MO99 (p < 0.01) and MO97 (p = 0.05) with or without rgp160. Mann Whitney U test was used to determine if the samples were significantly different than the negative control (**p < 0.01.and *p < 0.05). The bars represent the median percent and range inhibited HIV-1 p24 antigen in vitro from two to three repeated experiments. Comparisons of inhibited HIV-1 p24 were performed between control IgM (MO6) and the anti-HIV-1 neutralizing IgM MoAbs.