The specific suppression of contact sensitivity.

Area of Science:

• Immunology
• Cellular immunology
• Immunoregulation

Background:

• Contact sensitivity (CS) is an immune response mediated by T cells.
• Regulatory cells play a crucial role in modulating immune responses.
• Understanding suppressor mechanisms is key to controlling immune hypersensitivity.

Purpose of the Study:

• To investigate the role of 2,4,6 trinitrobenzenesulfonic acid (TNBS)-induced regulatory cells in contact sensitivity (CS) to picryl chloride.
• To characterize the suppressor factors released by these regulatory cells.
• To determine the specificity and genetic coding of these suppressor factors.

Main Methods:

• Induction of regulatory cells using 2,4,6 trinitrobenzenesulfonic acid (TNBS).
• Assessment of contact sensitivity (CS) modulation.
• Analysis of suppressor factors in cell supernatants.
• Investigation of hapten-coupled membrane products for tolerance induction.
• Characterization of suppressor factor specificity (hapten and H2-coded).

Main Results:

• TNBS-induced regulatory cells were confirmed to modulate CS generation.
• Suppressor factors released by these cells were shown to limit CS.
• Hapten-coupled membrane products induced tolerance to picryl chloride (PCl).
• Suppressor factors demonstrated hapten specificity.
• Suppressor factors were found to bear H2-coded specificities.

Conclusions:

• Regulatory cells and their secreted factors effectively suppress contact sensitivity (CS).
• Tolerance to picryl chloride (PCl) can be induced via hapten-coupled products.
• The identified suppressor factors are specific for haptens and possess H2-coded traits, suggesting a role for MHC in their function.