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- W2016998503 abstract "To explore the mechanisms by which Cryptosporidium parvum infects epithelial cells, we performed a detailed morphological study by serial electron microscopy to assess attachment to and internalization of biliary epithelial cells by C. parvum in an in vitro model of human biliary cryptosporidiosis. When C. parvum sporozoites initially attach to the host cell membrane, the rhoptry of the sporozoite extends to the attachment site; both micronemes and dense granules are recruited to the apical complex region of the attached parasite. During internalization, numerous vacuoles covered by the parasite's plasma membrane are formed and cluster together to establish a preparasitophorous vacuole. This preparasitophorous vacuole comes in contact with host cell membrane to form a host cell-parasite membrane interface, beneath which an electron-dense band begins to appear within the host cell cytoplasm. Simultaneously, host cells display membrane protrusion along the edge of the host cell-parasite membrane interface, resulting in the formation of a mature parasitophorous vacuole that completely covers the parasite. During internalization, vacuole-like structures appear in the apical complex region of the attached sporozoite, which bud out into host cells. A tunnel directly connecting the parasite to the host cell cytoplasm forms during internalization and remains when the parasite is totally internalized. Immunoelectron microscopy showed that sporozoite-associated proteins were localized along the dense band and at the parasitophorous vacuole membrane. These morphological observations provide evidence that secretion of parasite apical organelles and protrusion of host cell membrane play an important role in the attachment and internalization of host epithelial cells by C. parvum." @default.
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- W2016998503 date "2004-04-01" @default.
- W2016998503 modified "2023-10-15" @default.
- W2016998503 title "CRYPTOSPORIDIUM PARVUM ATTACHMENT TO AND INTERNALIZATION BY HUMAN BILIARY EPITHELIA IN VITRO: A MORPHOLOGIC STUDY" @default.
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- W2016998503 doi "https://doi.org/10.1645/ge-3204" @default.
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