Bovine leukosis virus in sheep,lymphocyte modification and surface-immunoglobulin-bearing cell numbers |
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| Authors: | I Takashima C Olson |
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| Institution: | 1. Department of Veterinary Science, University of Wisconsin, Madison, WI 53706 U.S.A. |
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| Abstract: | Lymphocytes from sheep experimentally infected with bovine leukosis virus (BLV) and from non-infected normal sheep were examined for the presence of surface Ig by an immunofluorescence test. Surface Ig-bearing lymphocytes in blood from BLV-infected sheep increased when lymphocyte counts of blood were elevated in comparison with normal animals. The mitogen stimulation of cultured lymphocytes from BLV-infected sheep and from non-infected normal sheep was determined by measuring 3H-thymidine incorporation. Peripheral blood lymphocytes (PBL) from BLV-infected leukemic sheep with elevated PBL counts responded poorly to phytohemagglutinin M and concanavalin A but responded well to lipopolysaccharide compared with lymphocytes from uninfected animals. In BLV-infected preleukemic sheep with low PBL counts, stimulation indices of mitogen responses of lymphocytes with phytohemagglutinin M, concanavalin A, and pokeweed mitogen were low compared with those of lymphocytes from uninfected animals. The results indicated that B cells were affected by BLV infection in sheep as suggested by the increased number of surface Ig-bearing lymphocytes and that significant alteration of mitogen stimulation of lymphocytes occured in sheep with BLV infection. |
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