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Human Cerebral Malaria^*

Possible factors contributing to the development of cerebral malaria were discussed based on pathological changes in Burmese patients who died of cerebral malaria. Blockage of cerebral capillaries by Plasmodium falciparum infected erythrocytes appeared to be the principal cause of cerebral malaria. From electron microscopic results, it was concluded that knobs on infected erythrocytes acted as focal junctions which mediated adhesion to endothelial cells. The knobs are, therefore, important contributors to the blockage of the capillary lumen and ensuing pathological changes in cerebral tissues. Host cell molecules such as OKM5 and thrombospondin may function as endothelial cell surface receptors for the attachment of knobs of P. falciparum infected erythrocytes. Immunological events might also play a role in the pathogenesis of cerebral malaria. This was suggested by the presence of IgG, IgM, P. falciparum antigens, and knob proteins in the cerebral capillaries of the people with cerebral malaria. It will be important to assess the candidate malaria vaccines now in development not only for their efficacy in reducing parasitemia but for effects they may have on the sequestration of infected erythrocytes in the brain.

^* Keynote speech delivered before the American Society of Tropical Medicine and Hygiene, Los Angeles, California, 30 November 1987.

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