Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Isotyping of Immunoglobulin G Responses of Ruminants and Mice to Live and Inactivated Antigens of Cowdria ruminantium the Causative Agent of Cowdriosis in Ruminants

  • Kibor, A.C. (Department of Animal Health, Egerton University) ;
  • Sumption, K.J. (Centre for Tropical Veterinary Medicine, University of Edinburgh) ;
  • Paxton, E.A. (Centre for Tropical Veterinary Medicine, University of Edinburgh)
  • Received : 2002.03.05
  • Accepted : 2002.07.22
  • Published : 2003.04.01
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Abstract

The Immunoglobulin $IgG_1$ and $IgG_2$ isotype immune responses of domestic ruminants and mice to Cowdria. ruminantium live infection or by immunization with inactivated organisms were determined by the enzyme linked immunosorbent assay and Western blotting. Immunization of goats with inactivated elementary bodies (IEBs) led to a predominant $IgG_1$ isotype response. This indicated that a Th2 response was induced. After challenge, the IgG isotype responses were mixed whereby both $IgG_1$ and $IgG_2$ antibodies were detected. Two goats that survived virulent challenge had a predominant $IgG_2$ isotype response. In cattle live infection by natur l challenge or experiment led to a predominant $IgG_1$ isotype response. Immunization of cattle with IEBs however led to mixed IgG responses characterized by similar $IgG_1$ and $IgG_2$ ratios. In the mouse live infection led to a predominant $IgG_2$ isotype response. This indicated the mouse developed a true Th1 type cell mediated immune response when inoculated with live organisms. Immunization with inactivated organisms on the other hand led to a dominant $IgG_1$ response. It is evident from this work that the immune responses of ruminants and mice to C. ruminantium are different and that using mice as the experimental model for immune responses to Cowdria ruminantium. is not the appropriate.

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References

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