Abstract
The value of [ 3H]-thymidine incorporation as a measurement for mitogen induced proliferation of dog peripheral blood lymphocytes (PBL) has been examined. The cells were cultured in RPMI 1640, enriched with 10% autologous plasma for 48 hours at 37°C, 5% CO 2 and 95% relative humidity. Under these conditions a great variability in [ 3H]-thymidine incorporation was observed. By analysis of CPM and number of activated cells (G 1), it was found that comparable number of G 1 cells were generated in human and dog PBL. Also, the membrane transport of thymidine was very similar for lymphocytes of the two species. Nevertheless, a low [ 3H]-thymidine incorporation by dog PBL was frequently seen, and this phenomenon could be related to a release of soluble substance(s) within the cultures. When the cultured cells were washed and resuspended in fresh medium immediately before pulsing, the expected CPM per G 1 cell could be obtained. Since it has been described in the literature that macrophages can produce cold thymidine in macrophage enriched lymphocyte cultures, the in vitro response of non-adherent dog PBL was analyzed. Mitogen stimulation of such non-adherent cells resulted in CPM per G 1 cells very similar to those obtained with washed cells. Based on these data, it is suggested that the production of cold thymidine might be one of the technical problems related to cultures of lectin stimulated dog PBL in vitro and it should be taken into consideration, if [ 3H]-thymidine incorporation is used as the only measure of lymphocyte proliferation.
Published Version
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