Anti-HIV adaptive immunity: determinants for viral persistence

Area of Science:

• Immunology
• Virology
• Vaccinology

Background:

• Primary control of human immunodeficiency virus (HIV) and simian immunodeficiency virus (SIV) by adaptive immunity is challenging.
• CD8+ cytotoxic T lymphocytes (CTLs) are vital for controlling viremia but often limited in natural HIV/SIV infections.
• Genetic factors in hosts and viruses influence CTL repertoire and efficacy.

Purpose of the Study:

• To discuss current insights into CTLs and neutralizing antibodies (NAbs) in HIV/SIV infection.
• To explore the potential protective mechanisms of CTLs and NAbs against persistent HIV/SIV infection.
• To contribute to the development of an effective AIDS vaccine by understanding immune responses.

Main Methods:

• Review of existing literature on CTLs and NAbs in HIV/SIV infection.
• Analysis of macaque models for SIV infection.
• Examination of human cohorts with controlled HIV infection.

Main Results:

• HIV/SIV infections often lack early neutralizing antibodies (NAbs).
• Absence of NAbs may diminish virus-specific CD4+ T-cell responses, impairing viral control.
• Numerous factors required for viral control have been identified through macaque models and human cohort studies.

Conclusions:

• Optimal coordination of CTLs and NAbs is essential for controlling persistent HIV/SIV infection.
• Further understanding of these immune components may lead to novel therapeutic strategies.
• Insights gained are critical for designing effective AIDS vaccines.