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Suppressor cells for delayed footpad reaction (DFR) against syngeneic testicular cells (TC) were detected in the spleen cells of donor mice immunized intravenously (iv) with viable syngeneic TC. Cyclophosphamide (CY)-pretreated recipients were given spleen cells from donors iv, immunized subcutaneously (sc) with syngeneic TC, and the footpad reaction at 24 hr was elicited with syngeneic TC 6 days after immunization. DFR in the recipients was suppressed by the transfer of spleen suppressor cells. The suppressor cells induced were Thy-1+, CY-sensitive, adult thymectomy (ATx)-resistant and act only at the induction stage. They directly suppress the generation of effector T cells for delayed-type hypersensitivity (DTH). When mice pretreated with CY were actively immunized with syngeneic TC, DFR could be provoked to a measurable level only when they were immunized sc. However, peritoneal exudate cells of those tolerant mice immunized sc without CY pretreatment or immunized iv with CY pretreatment also passively transferred DFR locally, suggesting the existence of effector T cells for DTH even in tolerant mice.
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