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A simplified method for hatching and isolating Toxocara canis larvae to facilitate excretory-secretory antigen collection in vitro.

Abstract
Human toxocariasis causes several dangerous syndromes that can involve the viscera, vision and central nervous system. Diagnosing toxocariasis requires the identification of antibodies against Toxocara canis or Toxocara cati excretions and secretions (ES). To obtain ES it is necessary to collect a large number of larvae. However, since the earliest work describing the culture of Toxocara larvae, few advances in the method have been made. It has been suggested that carbon dioxide triggers molecular mechanisms that enable nematode hatching. A similar hypothesis has been made regarding Giardia excystation. To test the hypothesis we used the Giardia excystation HBSS method to hatch embryonated T. canis eggs. We found that the HBSS method was more effective than the original De Savigny method. Our results suggest that both parasites require stimulation in an acidic environment, and the abrupt change to a basic milieu in duodenum. This physiological adaptation is successful to exploit the intestinal habitat.
AuthorsMartha Ponce-Macotela, Aarón Rodríguez-Caballero, Gustavo E Peralta-Abarca, Mario N Martínez-Gordillo
JournalVeterinary parasitology (Vet Parasitol) Vol. 175 Issue 3-4 Pg. 382-5 (Feb 10 2011) ISSN: 1873-2550 [Electronic] Netherlands
PMID21074327 (Publication Type: Journal Article)
CopyrightCopyright © 2010 Elsevier B.V. All rights reserved.
Chemical References
  • Antigens, Helminth
Topics
  • Animals
  • Antigens, Helminth (isolation & purification)
  • Dog Diseases (parasitology)
  • Dogs
  • Female
  • Larva (immunology)
  • Ovum (physiology)
  • Toxocara canis (immunology, isolation & purification, physiology)
  • Toxocariasis (parasitology)

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