Abstract
In the study reported here, we used RT-PCR with primers specific for interleukin-1 (IL-1), IL-6, IL-10, tumor necrosis factor-alpha (TNF-alpha), and nitric oxide synthase (iNOS) to assess the cytokine mRNA expression associated with bovine blood monocytes during their differentiation to macrophages cultured on plastic (1 week). In addition, we used RT-PCR to assess the contribution of gammadelta T cells as a source of interferon-gamma (IFN-gamma), the induction signal for iNOS. Further, we evaluated cytocentrifuge preparations from the cultures for the production of IL-10 using specific antibody. We previously demonstrated that iNOS can be induced in cultured bovine monocytes in response to IFN-gamma and TNF-alpha but lose this capability in a short period of time. However, we demonstrate here that iNOS induction from monocytes cultured with IFN-gamma secreting gammadelta T cells is prolonged, suggesting that this source of IFN-gamma primes the monocytes before exogenous stimulation. Based on mRNA expression, placement of monocytes in culture resulted in activation, followed by quiescence. By 6 days in culture, the iNOS message was reduced below the basal level. In addition, the TNF-alpha message was substantially reduced, and ...Continue Reading
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