The first merogony of Eimeria bovis takes place in lymphatic endothelial cells of the ileum, resulting in the formation of macromeronts up to 250 microm. In this study, we investigated the host cell cytoskeleton (actin filaments, microtubules, spectrin, vimentin intermediate filaments) associated with parasitic development in vitro by confocal laser scanning microscopy (CLSM) using primary bovine umbilical vein endothelial cells (BUVEC) and bovine spleen lymphatic endothelial cells (BSLEC) as host cells. No prominent changes in the host cell cytoskeleton were detected 1-3 days after E. bovis sporozoite invasion. With ongoing meront maturation a significant increase in microtubules and actin filaments close to the parasitophorous vacuole (PV) was found. Mature macromeronts within the PV were completely enclosed by these cytoskeletal elements. Our findings suggest, that in order to guarantee the survival of the host cell on the enlargement of macromeronts, E. bovis needs not only to augment but also to rearrange its cytoskeletal system.
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