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OKM5 antigen and thrombospondin are currently under investigation as potential receptors on the surface of human monocytes, endothelial cells, and melanomas responsible for the cytoadherence of Plasmodium falciparum-infected erythrocytes. We have studies the binding capacity of six human melanoma cell lines and related this property to the cytoplasmic and surface expression of the OKM5 antigen and thrombospondin by using indirect immunofluorescence assays on methanol-fixed and nonfixed melanomas. The presence of OKM5 antigen was detectable only in the melanoma lines which bound P. falciparum-infected erythrocytes. Thrombospondin was present in the cytoplasm of all the melanoma lines but was not detectable on the surface of any cells. Our work demonstrates a direct correlation between surface OKM5 antigen and cytoadherence in vitro. While our results do not exclude thrombospondin as a mediator of cytoadherence to endothelial cells in vivo, they showed no correlation between the presence of thrombospondin and the ability of melanoma cell lines to cytoadhere in vitro.

Cytoadherence of Plasmodium falciparum-infected erythrocytes to human melanoma cell lines correlates with surface OKM5 antigen