Lymphocyte transformation test in fixed drug eruption.

Area of Science:

• Immunology
• Dermatology
• Pharmacology

Background:

• Fixed drug eruption (FDE) is a specific type of adverse drug reaction.
• The immunological mechanisms underlying FDE are not fully understood.

Purpose of the Study:

• To investigate the role of serum factors and lymphocyte response in fixed drug eruptions.

Main Methods:

• Lymphocyte transformation test (LTT) was performed on 21 patients with FDE.
• Cultures included lymphocytes, the causative drug, and autologous serum from different clinical stages.

Main Results:

• Direct addition of the drug to lymphocytes did not induce blast transformation.
• Autologous serum from the acute phase of FDE induced lymphocyte blast transformation.
• The causative drug significantly enhanced this transformation in the presence of acute-phase serum.
• Serum from remission phases showed minimal or no response.

Conclusions:

• A transient serum factor appears during FDE, promoting lymphocyte transformation.
• This factor's activity is potentiated by the causative drug.
• The factor diminishes post-exacerbation, suggesting a role in FDE pathogenesis.