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Immune mechanisms in Marek's disease.
Authors:J M Sharma  B R Burmester
Institution:United States Department of Agriculture, Agriculture Research Service, Regional Poultry Research Laboratory, 3606 East Mount Hope Road, East Lansing, Michigan 48823, U.S.A.
Abstract:Resistance to progressive tumor development in MD is either naturally inherited or can be induced by vaccination with apathogenic or attenuated MDV or with HVT. Studies on the effects of immunosuppression on resistance have shown that natural and vaccine induced resistance may be mediated through immune responses. Cell-mediated immune responses rather than humoral responses appear to be of principal importance. The antigen(s) against which protective cell-mediated immunity is elicited are not yet clearly delineated. Both virus-related and tumor antigens may be involved. Progress in the understanding of cell-mediated immunity in MD has been slow because of lack of reproducible in vitro tests to measure this response in infected chickens. The development of lymphoblastoid cell lines from MD lymphomas, however, has enabled the development of an in vitro cytotoxicity test. In this test, which utilizes MSB-1 cells as the target cells, a specific cell-mediated immune response, presumably against the tumor antigen, MATSA, was detected in chickens infected with MDV. Further studies using similar in vitro tests will facilitate a better understanding of the role cell-mediated immune responses might play in development of MD.
Keywords:Marek's disease  immunity  mechanisms  resistance  Maladie de Marek  immunité  mécanismes  résistance
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