α-Macroglobulin Can Crosslink Multiple Erythrocyte Membrane Protein 1 (PfEMP1) Molecules and May Facilitate Adhesion of Parasitized Erythrocytes
Erythrocytes infected by parasites causing severe P. falciparum malaria often form rosettes by binding a number of uninfected erythrocytes. Several of the parasite proteins involved are known, whereas the identity of the corresponding host receptor(s) on the surrounding erythrocytes is not. Although formation of rosettes often depends on non-immune IgM also binding to the infected erythrocytes, that does not by itself lead to formation of rosettes. Here, we report that the serum protein α2-macroglobulin (α2M) is able to induce rosetting in several in vitro and ex vivo parasite isolates. In contrast to IgM, α2M supports rosetting on its own, while presence of IgM markedly lowers the concentration of α2M required. These findings are explainable by the ability of α2M to crosslink at least four individual PfEMP1 molecules, indicating that the role of α2M in rosetting is to align multiple parasite adhesion proteins, thereby increasing their combined avidity for carbohydrate receptors on surrounding erythrocytes. Our study suggests a new mechanism whereby P. falciparum exploits soluble host proteins to avoid immune destruction, by using them to facilitate adhesion of infected erythrocytes to low-affinity carbohydrate receptors, and points to new strategies to interfere with a major pathogenic mechanism of this devastating parasite.
Vyšlo v časopise:
α-Macroglobulin Can Crosslink Multiple Erythrocyte Membrane Protein 1 (PfEMP1) Molecules and May Facilitate Adhesion of Parasitized Erythrocytes. PLoS Pathog 11(7): e32767. doi:10.1371/journal.ppat.1005022
Kategorie:
Research Article
prolekare.web.journal.doi_sk:
https://doi.org/10.1371/journal.ppat.1005022
Souhrn
Erythrocytes infected by parasites causing severe P. falciparum malaria often form rosettes by binding a number of uninfected erythrocytes. Several of the parasite proteins involved are known, whereas the identity of the corresponding host receptor(s) on the surrounding erythrocytes is not. Although formation of rosettes often depends on non-immune IgM also binding to the infected erythrocytes, that does not by itself lead to formation of rosettes. Here, we report that the serum protein α2-macroglobulin (α2M) is able to induce rosetting in several in vitro and ex vivo parasite isolates. In contrast to IgM, α2M supports rosetting on its own, while presence of IgM markedly lowers the concentration of α2M required. These findings are explainable by the ability of α2M to crosslink at least four individual PfEMP1 molecules, indicating that the role of α2M in rosetting is to align multiple parasite adhesion proteins, thereby increasing their combined avidity for carbohydrate receptors on surrounding erythrocytes. Our study suggests a new mechanism whereby P. falciparum exploits soluble host proteins to avoid immune destruction, by using them to facilitate adhesion of infected erythrocytes to low-affinity carbohydrate receptors, and points to new strategies to interfere with a major pathogenic mechanism of this devastating parasite.
Zdroje
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