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Bovine peripheral blood leukocytes (PBL) and cells collected from the bovine mammary gland were assayed for antibody-dependent cell-mediated cytotoxicity (ADCC) against chicken erythrocyte (CRBC) and bovine herpesvirus-infected bovine kidney cell targets. Bovine antisera were used to sensitize target cells. Both PBL and mammary leukocytes expressed ADCC, with the latter cell population having greater activity against both target cells. Only the CRBC target cells were killed by nonadherent PBL and phagocyte-depleted PBL. Nonadherent mammary leukocytes, rich in monocytes and macrophages, did kill virus-infected target cells. Carbonyl iron-treated mammary leukocytes failed to kill virus-infected targets but could destroy CRBC targets. Antimacrophage serum inhibited lysis of both CRBC and virus-infected targets, but antilymphocyte serum only inhibited CRBC killing. These observations indicated that at least two kinds of cells could mediate ADCC against CRBC but only cells of the mononuclear phagocytic series could kill virus-infected target cells. The herpesvirus-infected target cells became susceptible to ADCC 9 h after virus infection. A case is made for investigating the phenomenon of ADCC using in vitro systems that closely mimic the in vivo situation. The possible role of the ADCC mechanism as instrumental in causing recovery from herpesvirus infections is discussed.

infection and immunity

Antibody-dependent cell-mediated cytotoxicity in cows: comparison of effector cell activity against heterologous erthrocyte and herpesvirus-infected bovine target cells