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HLA class II involvement in HIV-associated Toxoplasmic encephalitis development
Alicia Habegger de Sorrentino1, Roxana López, Patricia Motta
1Servicio de Histocompatibilidad e Inmunogenética, Servicio de Inmunología y Servicio de Infectología. Hospital Julio C. Perrando, Resistencia, Chaco, Argentina. sorro@arnet.com.ar
Clinical Immunology (Orlando, Fla.)
|May 12, 2005
Summary
Certain human leukocyte antigen (HLA) alleles, specifically HLA-DQB*0402 and DRB1*08, significantly increase the risk of developing opportunistic neurological infections like Toxoplasmic encephalitis in individuals with HIV-1.
Area of Science:
- Immunogenetics
- Infectious Diseases
- Neuroscience
Background:
- Human Immunodeficiency Virus (HIV) infection compromises the immune system, increasing susceptibility to opportunistic infections.
- Neurological complications, such as Toxoplasmic encephalitis (TE), are significant causes of morbidity and mortality in HIV-1-infected individuals.
- Genetic factors, particularly Human Leukocyte Antigen (HLA) alleles, may influence an individual's susceptibility to specific infections and disease progression.
Purpose of the Study:
- To investigate the association between specific HLA-DR and HLA-DQ alleles and the risk of developing opportunistic neurological infections in HIV-1-infected patients.
- To identify genetic markers that predict susceptibility to Toxoplasmic encephalitis in the context of HIV-1 infection.
Main Methods:
- Genotyping of HLA-DR and HLA-DQ loci was performed on 220 individuals, including 112 HIV-seronegative controls and 108 HIV-1-infected patients (categorized as AIDS with TE, AIDS without TE, and asymptomatic).
- Molecular biology techniques were employed for genotyping.
- Statistical analysis was conducted using Fisher's Exact test to determine the significance of associations.
Main Results:
- The HLA-DQB*0402 allele was strongly associated with an increased risk of developing Toxoplasmic encephalitis in HIV-1-infected individuals compared to healthy controls (Odds Ratio [OR] = 20.43) and asymptomatic patients (OR = 61.50).
- Similarly, the HLA-DRB1*08 allele showed a significant association with a higher risk of Toxoplasmic encephalitis in HIV-1-infected patients (OR = 11 compared to healthy controls, OR = 19.38 compared to asymptomatic patients).
- These associations remained significant even when compared to HIV-1 patients without neurological involvement.
Conclusions:
- The presence of HLA-DQB*0402 and DRB1*08 alleles in HIV-1-positive patients is identified as a significant risk factor for the development of neurological opportunistic infections.
- Toxoplasmic encephalitis is highlighted as the primary neurological opportunistic infection associated with these specific HLA alleles in the studied HIV-1 population.