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Journal of Virology, July 2006, p. 6621-6628, Vol. 80, No. 13
0022-538X/06/$08.00+0     doi:10.1128/JVI.02571-05
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Severe Papillomavirus Infection Progressing to Metastatic Squamous Cell Carcinoma in Bone Marrow-Transplanted X-Linked SCID Dogs

Michael H. Goldschmidt,1 Jeffrey S. Kennedy,2 Douglas R. Kennedy,2 Hang Yuan,3 David E. Holt,2 Margret L. Casal,2 Anne M. Traas,2 Elizabeth A. Mauldin,1,2 Peter F. Moore,4 Paula S. Henthorn,2 Brian J. Hartnett,2 Kenneth I. Weinberg,5 Richard Schlegel,3 and Peter J. Felsburg2*

Department of Pathobiology,1 Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104,2 Department of Pathology, School of Medicine, Georgetown University, Washington, D.C. 20057,3 Department of Veterinary Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, California 95616,4 Division of Research Immunology/Bone Marrow Transplantation, Childrens Hospital Los Angeles, Los Angeles, California 900275

Received 9 December 2005/ Accepted 30 March 2006

Canine X-linked severe combined immunodeficiency (XSCID) is due to mutations in the common gamma chain ({gamma}c) gene and is identical clinically and immunologically to human XSCID, making it a true homologue of the human disease. Bone marrow-transplanted (BMT) XSCID dogs not only engraft donor T cells and reconstitute normal T-cell function but, in contrast to the majority of transplanted human XSCID patients, also engraft donor B cells and reconstitute normal humoral immune function. Shortly after our initial report of successful BMT of XSCID dogs, it soon became evident that transplanted XSCID dogs developed late-onset severe chronic cutaneous infections containing a newly described canine papillomavirus. This is analogous to the late-onset cutaneous papillomavirus infection recently described for human XSCID patients following BMT. Of 24 transplanted XSCID dogs followed for at least 1 year post-BMT, 71% developed chronic canine papillomavirus infection. Six of the transplanted dogs that developed cutaneous papillomas were maintained for >3 1/2 years post-BMT for use as breeders. Four of these six dogs (67%) developed invasive squamous cell carcinoma (SCC), with three of the dogs (75%) eventually developing metastatic SCC, an extremely rare consequence of SCC in the dog. This finding raises the question of whether SCC will develop in transplanted human XSCID patients later in life. Canine XSCID therefore provides an ideal animal model with which to study the role of the {gamma}c-dependent signaling pathway in the response to papillomavirus infections and the progression of these viral infections to metastatic SCC.

* Corresponding author. Mailing address: Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, 3900 Delancey St., Philadelphia, PA 19104. Phone: (215) 898-3527. Fax: (215) 898-3662. E-mail: felsburg{at}mail.vet.upenn.edu.

Journal of Virology, July 2006, p. 6621-6628, Vol. 80, No. 13
0022-538X/06/$08.00+0     doi:10.1128/JVI.02571-05
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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