Ion distribution between the extracellular, cytoplasmic, and organellar spaces creates membrane potentials which drive many of life's processes. This bioelectric membrane potential, driven by ion channel and pump activity, can be harnessed to allow or prevent entry of signaling mediators like Ca2+ into the cytoplasm. Several HIV proteins have been reported to function as ion channels or alter ion channel activity. This activity likely influences cell fate including activation and apoptosis.
HIV depolarizes the plasma membrane and alters intracellular calcium levels. Changing the polarization of the plasma membrane would alter the levels of HIV infection.
HIV infected cells were identified using anti-Env antibody PG9-AF647. Membrane potential measurements were done by flow cytometry using the DiBAC4(3) dye as previously reported. Intracellular Ca2+ measurements were also done by flow cytometry using the Fluo-4 dye. Ionomycin and PMA were used to show the contrast in intracellular Ca2+ levels between infected and uninfected cells. To assess the effects of membrane potential changes on HIV replication, 200µM diazoxide was added to cells during infections.
HIV infected cells consistently had depolarized membrane potentials in both primary cells and cell lines. Additional depolarization increased infection. Membrane depolarization was accompanied by increased intracellular Ca2+. Ionomycin induced a drastic difference in Ca2+ flow between uninfected and HIV-infected cells. In uninfected cells, ionomycin induced an influx of Ca2+ while PMA had little effect. In contrast, both ionomycin and PMA induced a large efflux of Ca2+ from HIV infected cells.
The George Washington University