Hwl. Zieglerheitbrock et al., THE ANTIBODY MY4 RECOGNIZES CD14 ON PORCINE MONOCYTES AND MACROPHAGES, Scandinavian journal of immunology, 40(5), 1994, pp. 509-514
Several monoclonal antibodies directed against the human CD14 antigen
have been established. We now report that the antibody My4, but not Le
uM3, reacts with porcine monocytes. Among porcine peripheral blood mon
onuclear cells (PBMC), 14.6% of the cells stain with the CD14 antibody
My4, which is similar to the percentage obtained with the antiporcine
monocyte antibody 74-22-15. Two-colour immunofluorescence reveals tha
t My4 and 74-22-15 antigens are coexpressed on the same cells, and cel
l sorter-purified My4(+) cells exhibit the morphology of monocytes. Wh
ole blood analysis (which also shows staining of granulocytes) reveals
that the average percentage of My4 + monocytes amongst all leucocytes
is 5.8% with 580 cells/mu 1. Furthermore, porcine peritoneal macropha
ges (PM) and alveolar macrophages (AM), both stain for My4, with a fou
r-fold lower level on AM. Treatment of cells with phosphatidylinositol
-specific phospholipase C decreases My4 staining, but does not affect
staining with antibody 74-22-15. Immunoprecipitation with the My4 anti
body from surface labelled pig mononuclear cells demonstrates a 54 kDa
band similar to human CD14, and Western blotting with pig serum demon
strates two bands similar to the alpha and beta forms of human soluble
CD14. Finally, the My4 antibody is capable of blocking lipopolysaccha
ride- (LPS)-induced interleukin-6 production in isolated PBMC. These d
ata show that the My4 antibody recognizes genuine CD14 on porcine mono
cytes and macrophages.