The C-type Lectin Receptor CLEC12A Recognizes Plasmodial Hemozoin and Contributes to Cerebral Malaria Development

Abstract

Summary: Malaria represents a major cause of death from infectious disease. Hemozoin is a Plasmodium-derived product that contributes to progression of cerebral malaria. However, there is a gap of knowledge regarding how hemozoin is recognized by innate immunity. Myeloid C-type lectin receptors (CLRs) encompass a family of carbohydrate-binding receptors that act as pattern recognition receptors in innate immunity. In the present study, we identify the CLR CLEC12A as a receptor for hemozoin. Dendritic cell-T cell co-culture assays indicate that the CLEC12A/hemozoin interaction enhances CD8+ T cell cross-priming. Using the Plasmodium berghei Antwerpen-Kasapa (ANKA) mouse model of experimental cerebral malaria (ECM), we find that CLEC12A deficiency protects mice from ECM, illustrated by reduced ECM incidence and ameliorated clinical symptoms. In conclusion, we identify CLEC12A as an innate sensor of plasmodial hemozoin. : Raulf et al. demonstrate that CLEC12A recognizes plasmodial hemozoin and is involved in the development of experimental cerebral malaria (ECM). In vivo studies show a reduction in ECM in CLEC12A−/− mice that is accompanied by a decrease in the frequency of brain-sequestered granzyme B-expressing T cells. Keywords: cerebral malaria, C-type lectin receptor, MICL/CLEC12A, hemozoin, Plasmodium berghei