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Differences of the in vitro reactivity of lymphocytes from normal and persistently lymphocytotic cows to enzootic bovine leukosis tumor membrane extracts as detected with the macrophage electrophoretic mobility test


, : Differences of the in vitro reactivity of lymphocytes from normal and persistently lymphocytotic cows to enzootic bovine leukosis tumor membrane extracts as detected with the macrophage electrophoretic mobility test. Acta Biologica et Medica Germanica 41(7-8): 705-714

The response of peripheral blood lymphocytes from normal and persistently lymphocytotic cows to cell membranes and sodium cholate-extracted membrane proteins from normal and tumorous lymph nodes was tested with the macrophage electrophoretic mobility test with guinea pig peritoneal macrophages as indicator cells. Lymphocytes from 13 cows with persistent lymphocytosis (PL) showed a positive reaction with cholate extracts from tumor cell membranes. There was a negative reaction with corresponding extracts from normal lymph nodes for 11 animals. Of 10 hematologically normal cows, 4 also showed a positive reaction against tumor cell membrane extracts. One of these subsequently developed antibodies against bovine leukemia virus (BLV) glycoprotein gp 51. Using tumor cell membrane preparations as antigen, the 4 cows with PL also exhibited a positive reaction; none of 3 hematologically normal cows showed any reactivity. As efforts to detect the main antigenic proteins of BLV (gp 51, p 24) in detergent extracts of tumor cell membranes proved unsuccessful, these findings may provide evidence for the existence of a common non-viral antigen on cell membranes of bovine leukosis tumor cells.

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