Co-culture of HIV Gag-iGFP infected primary CD4 T cells or MT4 cells with primary renal tubular epithelial cells results in transfer of viral materials into the epithelial cell. Transfer of fluorescence virus into (A) MS114 primary epithelial cells from a HIVAN patient, (B) Primary HRCEpC, and (C) Hpt1b renal tubular cells. (D) MS114 cells were imaged by confocal microscope after virus transfer (DAPI, blue; HIV Gag-iGFP, green; CMTMR, red).