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Intracellular parasites use various strategies to invade cellsand to subvert cellular signaling pathways and, thus, to gaina foothold against host defenses. Efficient cell entry, abilityto exploit intracellular niches, and persistence make theseparasites treacherous pathogens. Most intracellular parasitesgain entry via host-mediated processes, but apicomplexans usea system of adhesion-based motility called "gliding" to activelypenetrate host cells. Actin polymerizationdependent motilityfacilitates parasite migration across cellular barriers, enablesdissemination within tissues, and powers invasion of host cells.Efficient invasion has brought widespread success to this group,which includes Toxoplasma, Plasmodium, and Cryptosporidium.
Department of Molecular Microbiology, Center for Infectious Diseases, Washington University School of Medicine, St. Louis, MO 63110, USA.
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