Regulatory T Cell Counts and Development of Malignancy in Patients with HIV Infection

Area of Science:

• Immunology
• Virology
• Oncology

Background:

• T-regulatory cells (Tregs) are crucial for immune homeostasis, modulating T-cell receptor (TCR) stimulation and immune cell function.
• In Human Immunodeficiency Virus (HIV) infection, Tregs present a dual role: potentially beneficial by reducing T-cell activation or detrimental by suppressing anti-HIV immunity.
• Imbalances in Tregs and effector T-cells can impair anti-tumor immunity and promote inflammatory diseases.

Purpose of the Study:

• To investigate the correlation between T-regulatory cell (Treg) concentration and Human Immunodeficiency Virus (HIV) infection parameters.
• To explore the relationship between Treg levels and the incidence of hematological and solid malignancies in HIV-infected individuals.

Main Methods:

• A longitudinal prospective study involving ex vivo phenotyping of peripheral blood mononuclear cells from patients with primary HIV infection.
• Patients were monitored every 3 months for the development of solid or hematological malignancies over a median follow-up of 64 months.
• Analysis included Treg counts, viral load, antiretroviral treatment (ART) status, CD4 (+) T-cell counts, and neoplasia development.

Main Results:

• Treg counts were significantly elevated in males, patients with high viral load (>350 copies/ml), and those experiencing virological failure to ART.
• Linear regression revealed a significant negative correlation between Treg levels and CD4 (+) T-cell counts.
• Patients diagnosed with neoplasia exhibited lower Treg levels; increasing Treg levels showed a negative correlation with neoplasia development.

Conclusions:

• In HIV-infected patients, elevated Treg levels are associated with disease progression.
• Low baseline Treg levels in HIV-infected individuals are linked to a higher probability of developing neoplasia.