Abstract
Nonimmunogenic peptic fragments of bovine serum albumin (BSA), Fraction Ia, suppressed immune response to BSA in mice. Splenic T lymphocytes from mice treated with these fragments suppressed the anti-DNP response in irradiated mice reconstituted with DNP-BSA-primed cells, indicating carrier-specific suppression. The conjugate of Fraction Ia with mouse γ-globulin (MGG) was found to be an effective suppressive substance but it did not induce suppressor T cells. B cells from mice given Ia-MGG were unresponsive to BSA when transferred to irradiated recipients along with either normal or BSA-primed T cells. Thus, unresponsiveness to BSA was mediated by either T or B lymphocytes, depending whether the inducing substance was a free fragment of the antigen or fragments conjugated to homologous γ-globulin.
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