Para-Phenylenediamine Sensitization and Polysensitization: TNF-α, CXCL11, and Immune-Regulatory Gene Polymorphisms
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Background: Para-phenylenediamine (PPD) is a major hair dye allergen and often heralds broader contact allergy risk, yet the links among PPD sensitization, polysensitization (PS) and host genetics remain understudied. Objective: To quantify the association between PPD sensitization and PS in Korean patch test patients and to explore whether single nucleotide polymorphisms (SNPs) in selected immuno- regulatory genes modulate this relationship. Methods: We retrospectively analysed 647 Korean patients patch tested with the Korean Stan- dard Series. PS was defined as reactivity to ≥3 unrelated allergens; simultaneous positives to nickel, cobalt or chromate were counted as one event. Independent predictors of PPD sensitiza- tion were determined by multivariable logistic regression, and allergen networks were visualised with heatmaps. Seventeen patients were genotyped for SNPs in tumor necrosis factor-alpha, CXCL11, interleukin (IL)-10, IL-16 and STAT6. Results: PPD sensitization was confirmed in 38 patients (5.9%) and remained independently associated with PS (adjusted odds ratio [OR], 2.72; 95% confidence interval, 1.11–6.67). Addi- tional chemical predictors were mercury ammonium chloride (OR, 3.68; p=0.018) and fragrance mix I (OR, 3.18; p=0.013). Heatmaps revealed dense preservative and rubber allergen clusters in PPD positive and particularly PS positive subsets. Exploratory genotyping showed numerical differences in CXCL11 variant frequency in PPD+/PS+ patients (85.7%) compared to expected population frequencies (about 50% in East Asians), though the small sample size (n=17) pre- cluded statistical significance testing. Conclusion: PPD sensitization identifies patients at increased risk for PS and reactivity to mer- cury compounds and fragrance-related substances. Preliminary genetic observations require validation in larger studies to determine potential immunogenetic contributions.
Abstract
Background: Para-phenylenediamine (PPD) is a major hair dye allergen and often heralds broader contact allergy risk, yet the links among PPD sensitization, polysensitization (PS) and host genetics remain understudied. Objective: To quantify the association between PPD sensitization and PS in Korean patch test patients and to explore whether single nucleotide polymorphisms (SNPs) in selected immuno- regulatory genes modulate this relationship. Methods: We retrospectively analysed 647 Korean patients patch tested with the Korean Stan- dard Series. PS was defined as reactivity to ≥3 unrelated allergens; simultaneous positives to nickel, cobalt or chromate were counted as one event. Independent predictors of PPD sensitiza- tion were determined by multivariable logistic regression, and allergen networks were visualised with heatmaps. Seventeen patients were genotyped for SNPs in tumor necrosis factor-alpha, CXCL11, interleukin (IL)-10, IL-16 and STAT6. Results: PPD sensitization was confirmed in 38 patients (5.9%) and remained independently associated with PS (adjusted odds ratio [OR], 2.72; 95% confidence interval, 1.11–6.67). Addi- tional chemical predictors were mercury ammonium chloride (OR, 3.68; p=0.018) and fragrance mix I (OR, 3.18; p=0.013). Heatmaps revealed dense preservative and rubber allergen clusters in PPD positive and particularly PS positive subsets. Exploratory genotyping showed numerical differences in CXCL11 variant frequency in PPD+/PS+ patients (85.7%) compared to expected population frequencies (about 50% in East Asians), though the small sample size (n=17) pre- cluded statistical significance testing. Conclusion: PPD sensitization identifies patients at increased risk for PS and reactivity to mer- cury compounds and fragrance-related substances. Preliminary genetic observations require validation in larger studies to determine potential immunogenetic contributions.