Cellular requirements for simulation by the purified streptococcal antigen DSR

Area of Science:

• Immunology
• Cell Biology

Background:

• The delayed skin reaction (DSR) is a key indicator of cellular immune response.
• Streptokinase-streptodornase (SKSD) is an antigen used to elicit DSR.
• Understanding the specific immune cell populations involved in DSR is crucial for immunological studies.

Purpose of the Study:

• To investigate the role of different peripheral blood mononuclear cell subsets in the delayed skin reaction (DSR) induced by streptokinase-streptodornase (SKSD).
• To determine whether T cells, B cells, or monocytes are essential for the DSR response.

Main Methods:

• Peripheral blood mononuclear cells (PBMCs) were isolated using Ficoll-Hypaque density gradient centrifugation.
• Cell populations were depleted of T cells (via sheep erythrocyte rosette formation), B cells (via nylon-wool column adsorption), and monocytes (via adherence and iron uptake).
• The proliferative response to DSR antigen was measured by tritiated thymidine incorporation into DNA.

Main Results:

• Depletion of T lymphocytes significantly diminished the DSR response.
• Removal of B lymphocytes did not affect the DSR response.
• Monocyte-depleted cells showed reduced tritiated thymidine incorporation in both antigen-stimulated and control conditions, but the stimulation index remained unchanged.

Conclusions:

• T lymphocytes are critical for mediating the delayed skin reaction to streptokinase-streptodornase.
• B lymphocytes do not play a significant role in this specific DSR.
• Monocytes contribute to the overall cellular proliferation but do not alter the antigen-specific stimulation index in this context.