Abstract
S.c. or oral administration of the polyunsaturated fatty acid linoleic acid prolonged survival of skin allografts in mice. Mice fed on a diet deficient in polyunsaturated fatty acids showed a relative immunopotentiation, as indicated by accelerated skin allograft rejection and decreased incidence and rate of development of methylcholanthrene-induced tumors. Polyunsaturated fatty acids apparently take part in immunoregulatory mechanisms.