Interplay between Selenium, Selenoproteins and HIV-1 Replication in Human CD4 T-Lymphocytes

Area of Science:

• Immunology
• Virology
• Nutritional Science

Background:

• Human immunodeficiency virus (HIV) infection disrupts cellular processes in CD4 T-lymphocytes, including micronutrient metabolism.
• Selenium deficiency in HIV-infected individuals is linked to lower CD4 T-cell counts and reduced life expectancy.
• Selenium is crucial for antioxidant defense and redox homeostasis, primarily through selenoproteins.

Purpose of the Study:

• To investigate the interplay between selenium, selenoproteins, and HIV infection in CD4 T-lymphocytes.
• To characterize the selenoproteome's response to varying selenium levels and HIV-1 infection.

Main Methods:

• Culturing human CD4 T-lymphocyte cell lines (Jurkat, SupT1) and primary cells with different selenium concentrations.
• Analyzing selenoproteome expression in response to selenium levels and HIV-1 infection.
• Assessing the impact of selenium on HIV-1 protein production, infectivity, and the percentage of infected cells.

Main Results:

• Selenoproteome expression in T-cells is tightly regulated by extracellular selenium levels.
• Selenium supplementation did not significantly alter HIV-1 protein production or infectivity.
• Selenium slightly reduced the percentage of HIV-1 infected cells in Jurkat and primary CD4 T-cells.
• HIV-1 infection caused minor alterations in the T-cell selenoproteome.

Conclusions:

• Selenium influences the susceptibility of CD4 T-lymphocytes to HIV-1 infection.
• The selenoproteome is responsive to both selenium availability and HIV-1 infection in T-cells.
• Further research is needed to elucidate the precise mechanisms of selenium's protective effects against HIV-1.