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Tissue Culture and Explant Approaches to Studying and Visualizing Neospora caninum and Its Interactions with the Host Cell

  • Andrew Hemphill (a1), Nathalie Vonlaufen (a1), Arunasalam Naguleswaran (a1), Nadine Keller (a1), Michele Riesen (a1), Nicole Guetg (a1), Sangeetha Srinivasan (a1) and Ferial Alaeddine (a1)...
Abstract

Neospora caninum is an apicomplexan parasite first mentioned in 1984 as a causative agent of neuromuscular disease in dogs. It is closely related to Toxoplasma gondii and Hammondia heydorni, and its subsequent description in 1988 has been, and still is, accompanied by discussions on the true phylogenetical status of the genus Neospora. N. caninum exhibits features that clearly distinguish this parasite from other members of the Apicomplexa, including distinct ultrastructural properties, genetic background, antigenic composition, host cell interactions, and the definition of the dog as a final host. Most importantly, N. caninum has a particular significance as a cause of abortion in cattle. In vitro culture has been indispensable for the isolation of this parasite and for investigations on the ultrastructural, cellular, and molecular characteristics of the different stages of N. caninum. Tissue culture systems include maintenance of N. caninum tachyzoites, which represent the rapidly proliferating stage in a large number of mammalian host cells, culture of parasites in organotypic brain slice cultures as a tool to investigate cerebral infection by N. caninum, and the use of techniques to induce the stage conversion from the tachyzoite stage to the slowly proliferating and tissue cyst-forming bradyzoite stage. This review will focus on the use of these tissue culture models as well as light- and electron-microscopical techniques for studies on N. caninum tachyzoites and bradyzoites, and on the physical interactions between parasites and host cells.

Copyright
© 2004 Microscopy Society of America
Corresponding author
Corresponding author. E-mail: andrew.hemphill@ipa.unibe.ch
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