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EFFECT OF RABBIT ANTILYMPHOCYTE γ‐GLOBULIN IN MICE TOLERANT OR SENSITIZED TO NORMAL RABBIT γ‐GLOBULIN

The effect of rabbit antimouse lymphocyte γ-globulin (ALγ) on prolonging first- and second-set skin allografts was studied in mice previously rendered tolerant or sensitized to normal rabbit γ-globulin (NRγ). Tolerance to Nγ was induced by the injection of newborn (CBA/Rij X C57BL/Rij) F1 mice with NRγ. A state of sensitization was produced in adult F1 mice by two methods. Mice were injected with either NRγ emulsified with Freund's adjuvant or alum-precipitated NRγ. The effect of ALγ on both first- and second-set allografts was enhanced in mice who were tolerant to NRγ. Circulating antibody to rabbit IγG was detected only in mice sensitized with alum-precipitated NRγ and a diminution of the effect of ALγ on allografts was seen only in these mice. A primary course of ALγ also diminished the effect of a second course of ALγ 1 month later on prolonging allograft survival.