Microscopy and Microanalysis



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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 c1 , Nathalie  Vonlaufen  a1 , Arunasalam  Naguleswaran  a1 , Nadine  Keller  a1 , Michele  Riesen  a1 , Nicole  Guetg  a1 , Sangeetha  Srinivasan  a1 and Ferial  Alaeddine  a1
a1 Institute of Parasitology, University of Berne, Länggass-Strasse 122, CH-3012 Bern, Switzerland

Article author query
hemphill a   [PubMed][Google Scholar] 
vonlaufen n   [PubMed][Google Scholar] 
naguleswaran a   [PubMed][Google Scholar] 
keller n   [PubMed][Google Scholar] 
riesen m   [PubMed][Google Scholar] 
guetg n   [PubMed][Google Scholar] 
srinivasan s   [PubMed][Google Scholar] 
alaeddine f   [PubMed][Google Scholar] 

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.

(Received January 16 2003)
(Accepted April 8 2003)


Key Words: Neospora caninum; scanning electron microscopy; transmission electron microscopy; immuno-fluorescent labeling.

Correspondence:
c1 Corresponding author. E-mail: andrew.hemphill@ipa.unibe.ch