Abstract
The cellular site of action of SIRS, a soluble immune response suppressor released by Con A-activated spleen cells which suppresses antibody responses to heterologous erythrocytes by murine spleen cells in vitro, was investigated. Exposure of spleen cells to SIRS for 2 hr at 37 degrees C or 1 hr at 4 degrees C was sufficient to suppress 5-day antibody responses in vitro. Similar exposure of splenic or peritoneal exudate macrophages to SIRS also suppressed antibody responses by untreated splenic lymphoid cells; exposure of splenic lymphoid cells to SIRS was without effect. SIRS did not act via T cells which might have contaminated the macrophage preparations. SIRS-mediated suppression could be partially overcome by an excess of normal peritoneal exudate macrophages, but not by an excess of T or B cells. These data indicate that the target cell of SIRS activity is the macrophage. The results are discussed in the context of macrophage functions that could be affected by SIRS.
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