T cell virological synapses and HIV-1 pathogenesis.

Area of Science:

• Immunology
• Virology
• Cell Biology

Background:

• Human immunodeficiency virus type 1 (HIV-1) causes acquired immune deficiency, marked by CD4+ T cell loss.
• While plasma viremia predicts CD4+ decline, the primary drivers of HIV-1 spread remain under investigation.
• Lymphoid tissues, sites of immune responses, exhibit active viral replication and cell-cell interactions.

Purpose of the Study:

• To review the role of cell-cell interactions in HIV-1 dissemination.
• To explore T cell-T cell interactions as a key mechanism for viral spread.
• To examine how this mode of infection influences resistance to antibodies and viral genetic diversity.

Main Methods:

• Review of existing literature on HIV-1 dissemination and cell-cell interactions.
• Focus on in vitro studies of dendritic cell-T cell and T cell-T cell interactions.
• Examination of the concept of virological synapses in HIV-1 spread.

Main Results:

• Cell-cell interactions, especially between infected and uninfected CD4+ T cells, significantly enhance HIV-1 spread in vitro.
• These interactions are hypothesized to be a dominant route for viral dissemination in vivo.
• Virological synapses are proposed as the primary sites for virus transmission between T cells.

Conclusions:

• T cell-T cell interactions, forming virological synapses, are a critical factor in HIV-1 pathogenesis.
• This mode of spread may contribute to HIV-1's ability to evade neutralizing antibodies.
• Understanding virological synapses is crucial for explaining HIV-1 genetic diversity and developing effective therapies.