Infection with HIV is associated with elevated IL-6 levels and production.

Area of Science:

• Immunology
• Virology

Background:

• Polyclonal B cell activation is a hallmark of Acquired Immunodeficiency Syndrome (AIDS) and Human Immunodeficiency Virus (HIV) infection.
• Interleukin-6 (IL-6), also known as B cell stimulatory factor 2, is crucial for B cell differentiation into antibody-secreting cells.
• HIV exposure induces IL-6 production in human peripheral blood mononuclear cells (PBMC).

Purpose of the Study:

• To investigate the association between HIV infection and interleukin-6 (IL-6) levels.
• To determine if IL-6 overproduction contributes to polyclonal B cell activation in HIV-infected individuals.

Main Methods:

• Quantified circulating plasma IL-6 levels in HIV-infected and healthy donors.
• Measured spontaneous IL-6 production and IL-6 mRNA expression in PBMC from both groups.
• Assessed levels of an IL-6-induced acute-phase protein.

Main Results:

• HIV-infected donors exhibited significantly elevated plasma IL-6 and IL-6 mRNA levels compared to controls.
• PBMC from HIV-infected individuals produced markedly higher amounts of IL-6 in vitro without exogenous stimulation.
• Levels of an IL-6-induced acute-phase protein were also increased in HIV-infected donors.

Conclusions:

• Elevated IL-6 is strongly associated with HIV infection.
• IL-6 overproduction is a potential mechanism contributing to the polyclonal B cell activation seen in AIDS and HIV infection.
• These findings highlight IL-6 as a key mediator in HIV-associated immune dysregulation.