Abstract
When porcine blood monocytes differentiate in vitro into macrophages, their morphology, as well as side scatter and forward scatter measured by flow cytometry, changed in a manner similar to that with human cells. During this differentiation, the initial high expression of CD molecules on porcine monocytes was down-regulated, with one exception—SWC9. Freshly isolated blood monocytes were SWC9 −, but after culture the cells had become SWC9 +. Thus, porcine monocytes were characterised as SWC3 +SWC9 −CD14 high; macrophages were SWC3 +SWC9 +CD14 low, the latter also displaying a down-regulation of CD11a 18 , and, to a lesser degree, CD44. Both SWC9 −CD14 high monocytes and SWC9 +CD14 low macrophages were identifiable in freshly prepared monocytic cells from the spleen. Alveolar macrophages, on the other hand, were dominated by SWC9 +CD14 low cells, similar in phenotype to in vitro monocyte-derived macrophages. The consequences which these results have for studies on virus infections of porcine monocytic cells are discussed.
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