Pathogenesis of Chronic Wasting Disease in Cervidized Transgenic Mice

Copyright © 2010 American Society for Investigative Pathology American Journal of Pathology, doi:10.2353/ajpath.2010.090710

Accepted for publication February 18, 2010.

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Regular Article

Pathogenesis of Chronic Wasting Disease in Cervidized Transgenic Mice

Davis M. Seelig*, Gary L. Mason*, Glenn C. Telling, and Edward A. Hoover*@ From the Departments of Microbiology, Immunology, and Pathology,* Colorado State University, Fort Collins, Colorado; and the Department of Microbiology, Immunology, and Molecular Genetics, University of Kentucky, Lexington, Kentucky

@ To whom correspondence should be addressed. E-mail: edward.hoover@colostate.edu.

Abstract

Chronic wasting disease (CWD) is a fatal, endemic prion disease of wild and captive cervids, including deer, elk, and moose. Typical of prion diseases, CWD is characterized by the conversion of the native, protease-sensitive protein PrPC to a protease-resistant isoform, denoted as PrPRES. Here we have studied the expression of cervid PrPC and the pathogenesis of CWD infection in transgenic mice expressing the normal cervid prion protein (Tg[CerPrP] mice). Using tissue-based in situ immunohistochemistry protocols, we first identified cervid PrPC expression in the lymphoid, nervous, hemopoietic, endocrine, and certain epithelial tissues of Tg[CerPrP] mice. Tg[CerPrP] mice were then inoculated with CWD via one of four routes (intracerebral, intravenous, intraperitoneal, or oral); all groups developed spongiform encephalopathy, although the oral route required a larger infecting dose. Incubation periods were 184 ± 13, 218 ± 15, 200 ± 7, and 350 ± 27 days after inoculation, respectively. In longitudinal studies, we tracked the appearance of PrPRES in the brain, spleen, Peyer's patches, lymph nodes, pancreatic islets of Langerhans, bone marrow, and salivary glands of preclinical and terminal mice. In addition, we documented horizontal transmission of CWD from inoculated mice and to un-inoculated cohabitant cage-mates. This work documents the multiroute susceptibility, pathogenesis, and lateral transmission of CWD infection in Tg[CerPrP] mice, affirming this model as a robust system to study this cervid transmissible spongiform encephalopathy.

http://ajp.amjpathol.org/cgi/content/abstract/ajpath.2010.090710v1



>>> In addition, we documented horizontal transmission of CWD from inoculated mice and to un-inoculated cohabitant cage-mates. <<<


disturbing. ...TSS


Tuesday, February 09, 2010


Chronic Wasting Disease: Surveillance Update North America: February 2010


http://chronic-wasting-disease.blogspot.com/2010/02/chronic-wasting-disease-surveillance.html



http://chronic-wasting-disease.blogspot.com/