Lymphocyte transformation test in allergic contact nickel dermatitis

Area of Science:

• Immunology
• Dermatology
• Allergy Research

Background:

• Nickel dermatitis is a common allergic contact dermatitis.
• Patch testing is the standard for diagnosing nickel allergy.
• The cellular immune response in nickel dermatitis requires further investigation.

Purpose of the Study:

• To evaluate the utility of the lymphocyte transformation test (LTT) in patients with nickel dermatitis.
• To assess the in vitro cellular immune response to varying concentrations of nickel sulfate.
• To explore potential differences in immune reactivity among patients.

Main Methods:

• Twenty-five patients with confirmed nickel dermatitis underwent LTT.
• Lymphocytes were cultured with serial dilutions of nickel sulfate (NiSO4).
• Thymidine incorporation was measured to assess lymphocyte blast transformation.

Main Results:

• No lymphocyte transformation was observed in control subjects.
• Fourteen patients showed maximal thymidine incorporation at high NiSO4 dilutions (1:50,000–1:100,000).
• Eleven patients exhibited maximal incorporation at lower NiSO4 dilutions.

Conclusions:

• The LTT can detect in vitro lymphocyte responses to nickel sulfate in patients with nickel dermatitis.
• Patient responses to nickel sulfate dilutions vary, suggesting different immune sensitivities.
• The specific antigen responsible for the observed reactions in all cases remains unidentified.