In vitro antibody-mediated macrophage activity on Breinlia macropi microfilariae. II. Ultrastructural and video recording investigations of adherence and cytotoxicity.
Video recordings and ultrastructural studies have revealed an intricate sequence of antibody-mediated cytotoxic activity by quokka peritoneal macrophages on Breinlia macropi microfilariae. The microfilaricidal activity was effected by at least two types of macrophages measuring 17 micrometers and 8 micrometers in diameter respectively. The relatively large macrophages were responsible for trapping, encircling and eventually degrading the highly motile microfilariae in a sequence of events in which the participating macrophages may interdigitate. The smaller macrophages adhered transiently to a number of adjacent sites on the surface of a trapped microfilaria, resulting in a series of damaged spots. This activity of the small macrophages was interpreted as responsible for killing the microfilaria. Thus the microfilaricidal activity was interpreted to be accomplished by the co-operative functions of the relatively large and small macrophages.
D000818:Animals; D000920:Antibody-Dependent Cell Cytotoxicity; D002448:Cell Adhesion; D005370:Filarioidea / Q000276:immunology*; D008264:Macrophages / Q000276:immunology*; D007614:Macropodidae / Q000276:immunology*; D008394:Marsupialia / Q000276:immunology*; D008842:Microfilariae / Q000276:immunology*; D008854:Microscopy, Electron; D008855:Microscopy, Electron, Scanning; D009040:Motion Pictures