Langerhans cells and HIV infection

Area of Science:

• Immunology
• Virology
• Dermatology

Background:

• Epidermal Langerhans cells (LCs) are immune cells found in the skin.
• Human immunodeficiency virus type 1 (HIV-1) establishes infection in various immune cells.
• The role of LCs in HIV-1 pathogenesis, particularly in early transmission, requires further elucidation.

Purpose of the Study:

• To investigate the susceptibility of epidermal Langerhans cells (LCs) to HIV-1 infection.
• To explore the potential role of LCs in the sexual transmission of HIV-1.
• To determine if LCs can act as a reservoir for HIV-1 and contribute to T-cell infection.

Main Methods:

• Isolation and characterization of epidermal Langerhans cells (LCs) from HIV-1 infected individuals.
• In vitro infection of normal LCs with HIV.
• Analysis of HIV-1 proviral DNA and RNA within infected LCs.
• Assessment of HIV antigen presentation by LCs to helper T cells.

Main Results:

• Epidermal LCs from HIV-1 infected individuals harbor viral DNA and RNA, indicating productive infection in vivo.
• Normal LCs can be infected by HIV in vitro.
• Infected LCs can present HIV antigens to T cells, potentially initiating an immune response.
• LCs in genital mucosa may be early targets of HIV following sexual contact.

Conclusions:

• Epidermal Langerhans cells (LCs) are productively infected by HIV-1 in vivo.
• LCs play a potential role in the sexual transmission of HIV-1 by infecting T cells.
• LCs may serve as a viral reservoir, facilitating sustained T-cell infection and immune priming to HIV antigens.