An association between cutaneous sensitivity to histamine and HLA phenotype

Area of Science:

• Immunogenetics
• Dermatology
• Histamine Biology

Background:

• The major histocompatibility complex (MHC) plays a crucial role in immune responses.
• Cutaneous sensitivity to histamine can vary among individuals.
• Understanding genetic influences on histamine response is important for dermatological and immunological research.

Purpose of the Study:

• To investigate the association between human leukocyte antigen (HLA) types and cutaneous sensitivity to histamine.
• To determine if genes within the MHC influence histamine-induced skin reactions.

Main Methods:

• Human leukocyte antigen (HLA) typing was performed on 420 healthy subjects.
• Cutaneous sensitivity to histamine was assessed using prick testing with five different histamine concentrations.
• Statistical analysis was used to evaluate the correlation between HLA types and histamine response.

Main Results:

• 41% of subjects exhibited positive skin responses to 10(-1) mg/ml histamine.
• Subjects with the HLA-B7 antigen showed a significantly higher prevalence of positive histamine responses (55%).
• A statistically significant association (p < 0.005) was observed between HLA-B7 and histamine sensitivity.

Conclusions:

• Genes located within the major histocompatibility complex influence the skin's response to histamine.
• The HLA-B7 antigen is specifically associated with increased cutaneous sensitivity to histamine.
• These findings suggest a genetic component to histamine-mediated skin reactions.