<p>BCBL-1 +/− rapamycin 12 nM were induced with CoCl<sub>2</sub>, TPA, or VPA. Five days post-induction, virus was concentrated from supernatants. HeLa cells were then infected with concentrated virus in the presence of polybrene. Viral titers were determined by staining HeLa cells for punctate intranuclear LANA dots and analyzing via multispectral imaging flow cytometry. (A) Images show representative nuclear staining with DRAQ5 (Nuc.), LANA antibody stain, and the overlay (Comb.). Upper panel shows three representative HeLa cells infected with inoculum from untreated VPA-induced BCBL-1. Lower panel shows representative HeLas infected with inoculum from rapamycin-treated VPA-induced cells. (B) Graph of viral titers untreated (black bars) or treated with rapamycin (gray bars) for each indicated inducting agent. Representative experiment, n = 2. (C) Inhibition of cell-to-cell virus transmission from spontaneously lytic BCBL-1 was assessed by culture of BCBL-1 in the presence of 12 nM rapamycin for 2 days. Cells were then harvested, placed in fresh media without rapamycin and co-cultured with HeLa cells for 24 h. BCBL-1 cells were removed, HeLa cells washed x 2 to remove non-adherent BCBL-1 cells, and cultured an additional 24 h before harvest. Adherent HeLa cells were trypsinized, fixed and stained for intranuclear LANA dots. LANA<sup>+</sup> HeLa cells were analyzed by MIFC. Graph shows percentage (mean ± s.d.) of infected cells from triplicate cultures for HeLa cells co-cultured with either rapamycin-treated (gray) or DMSO-treated (black) BCBL-1. ** p<0.01.</p
