HLA-Cw*0602 and HIV-associated psoriasis

Area of Science:

• Immunology
• Genetics
• Dermatology

Background:

• Psoriasis aetiopathogenesis is unclear, with potential genetic and environmental factors.
• The immunological basis of psoriasis, including T lymphocyte roles (CD4 vs. CD8), is debated.
• Psoriasis is linked to HLA-Cw6/Cw7 and specifically HLA-Cw*0602, but its behavior in HIV infection is complex.

Purpose of the Study:

• To investigate the prevalence of HLA-C alleles in HIV-infected individuals with type 1 psoriasis.
• To determine if the association between HLA-Cw*0602 and psoriasis is stronger in the context of HIV infection.

Main Methods:

• A case-control study involving 14 men with HIV and type 1 psoriasis, and 147 HIV-infected controls without psoriasis.
• Human Leukocyte Antigen (HLA) typing was performed using polymerase chain reaction (PCR) with sequence-specific amplification primers.

Main Results:

• Eleven of 14 patients (79%) with psoriasis carried the HLA-Cw*0602 allele, versus 24.5% in controls (odds ratio = 11.31, P = 0.0001).
• Two patients without HLA-Cw*0602 carried the related HLA-Cw*0401/3 allele.
• The association of HLA-Cw*0602 with psoriasis appears stronger in HIV-associated cases, though larger studies are needed.

Conclusions:

• The study confirms the association between HLA-Cw*0602 and type 1 psoriasis.
• HIV-associated immune dysregulation may trigger psoriasis in genetically predisposed individuals (HLA-Cw*0602).
• The strong HLA class I association supports a significant role for CD8+ T lymphocytes in HIV-associated psoriasis immunopathogenesis.