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Polymorphonuclear leucocytes in the specific antigen-induced inhibition of the in vitro migration of human peripheral leucocytes.

. Antigen-induced inhibition of cell migration, a good in vitro parameter for cellular hypersensitivity, occurs only when the tested cell population contains both lymphocytes and cells with phagocytic properties. Leucocyte migration studies are presented of non-separated leucocytes, isolated polymorphonuclear leucocytes, isolated mononuclear leucocytes, a mixture of preseparated polymorphonuclear and mononuclear leucocytes, and a mixture of preseparated polymorphonuclear leucocytes and lymphocytes from brucella-positive and brucella-negative persons. Isolated polymorphonuclear leucocytes and isolated mononuclear leucocytes from brucella-positive persons did not show antigen-induced inhibition of migration. A mixture of preseparated polymorphonuclear and mononuclear leucocytes and a mixture of preseparated polymorphonuclear leucocytes and lymphocytes showed antigen-induced inhibition of migration to the same degree as non-separated leucocytes. The studies indicate that inhibition of leucocyte migration is dependent on the presence of both lymphocytes and polymorphonuclear leucocytes, whereas the monocyte scarcely plays any decisive part in the leucocyte migration test.