Sisquella Xavier, Nebl Thomas, Thompson Jennifer K, Whitehead Lachlan, Malpede Brian M, Salinas Nichole D, Rogers Kelly, Tolia Niraj H, Fleig Andrea, O'Neill Joseph, Tham Wai-Hong, David Horgen F, Cowman Alan F
The Walter and Eliza Hall Institute of Medical Research, Parkville, Australia.
Molecular Microbiology and Microbial Pathogenesis, Washington University School of Medicine, St. Louis, United States.
Elife. 2017 Feb 22;6:e21083. doi: 10.7554/eLife.21083.
The most lethal form of malaria in humans is caused by . These parasites invade erythrocytes, a complex process involving multiple ligand-receptor interactions. The parasite makes initial contact with the erythrocyte followed by dramatic deformations linked to the function of the Erythrocyte binding antigen family and reticulocyte binding-like families. We show EBA-175 mediates substantial changes in the deformability of erythrocytes by binding to glycophorin A and activating a phosphorylation cascade that includes erythrocyte cytoskeletal proteins resulting in changes in the viscoelastic properties of the host cell. TRPM7 kinase inhibitors FTY720 and waixenicin A block the changes in the deformability of erythrocytes and inhibit merozoite invasion by directly inhibiting the phosphorylation cascade. Therefore, binding of parasites to the erythrocyte directly activate a signaling pathway through a phosphorylation cascade and this alters the viscoelastic properties of the host membrane conditioning it for successful invasion.
人类疟疾最致命的形式是由……引起的。这些寄生虫侵入红细胞,这是一个涉及多种配体-受体相互作用的复杂过程。寄生虫首先与红细胞接触,随后发生与红细胞结合抗原家族和类网织红细胞结合家族功能相关的剧烈变形。我们发现EBA-175通过与血型糖蛋白A结合并激活包括红细胞细胞骨架蛋白在内的磷酸化级联反应,介导红细胞变形性的显著变化,从而导致宿主细胞粘弹性特性的改变。TRPM7激酶抑制剂FTY720和外切霉素A通过直接抑制磷酸化级联反应,阻断红细胞变形性的变化并抑制裂殖子入侵。因此,寄生虫与红细胞的结合通过磷酸化级联反应直接激活信号通路,这改变了宿主膜的粘弹性特性,使其适合成功入侵。