Pathogenesis of human immunodeficiency virus infection

Area of Science:

• Virology
• Immunology
• Infectious Diseases

Background:

• Human immunodeficiency virus (HIV) is a lentivirus causing Acquired immunodeficiency syndrome (AIDS).
• HIV infection involves interaction with CD4 molecules and other cellular receptors, leading to virus-cell fusion and entry.
• Transmission occurs via blood, genital fluids, and mother-to-newborn, impacting diverse cell types like CD4+ lymphocytes and macrophages.

Purpose of the Study:

• To elucidate the complex mechanisms of HIV infection, replication, and host immune evasion.
• To understand factors contributing to persistent HIV infection and viral reservoirs.
• To review current and investigate future therapeutic and vaccine development strategies against HIV.

Main Methods:

• Analysis of HIV's interaction with cellular receptors (e.g., CD4) and entry mechanisms.
• Investigation of intracellular pathways governing viral gene expression and infection outcomes (productive vs. latent).
• Examination of host immune responses, including neutralizing antibodies and cellular immunity (CD8+ T cells), against heterogeneous HIV strains.

Main Results:

• HIV infection leads to CD4+ lymphocyte death and persistent macrophage infection, forming viral reservoirs.
• HIV strains exhibit heterogeneity, influencing pathogenicity and immune resistance.
• Effective host immune responses, particularly CD8+ cell activity, can suppress HIV for extended periods, especially with low-virulence strains.

Conclusions:

• Long-term HIV survival is associated with less virulent strains and strong cellular immunity.
• Significant challenges remain in preventing HIV infection and developing effective vaccines.
• Continued research is crucial to address the global HIV/AIDS epidemic.