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Vertical transmission of human immunodeficiency virus type 1 (HIV-1) is the primary cause of infection by this retrovirus in infants. In this study, we report for the first time that there is a correlation between endocytic uptake of HIV-1 and virus gene expression in polarized trophoblasts. To shed light on the relationship between endocytosis and the fate of HIV-1 in polarized trophoblasts, the step-by-step movements of HIV-1 within the endocytic compartments were tracked by confocal imaging. Incoming virions were initially located in early endosomes. As time progressed, virions accumulated in late endosomes. HIV-1 was also found in apical recycling endosomes and at the basolateral pole. Experiments performed with indicator cells revealed that HIV-1 is recycled and transcytosed. These data indicate that the intracellular trafficking of HIV-1 upon entry into polarized human trophoblasts is a complex process which requires the active participation of the endocytic host cell machinery.

journal of virology

Endocytic Host Cell Machinery Plays a Dominant Role in Intracellular Trafficking of Incoming Human Immunodeficiency Virus Type 1 in Human Placental Trophoblasts