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Vet Pathol 42:321-330 (2005)
© 2005 American College of Veterinary Pathologists

Morphologic Features and Development of Granulomatous Vasculitis in Feline Infectious Peritonitis

A. Kipar, H. May, S. Menger, M. Weber, W. Leukert and M. Reinacher

Institut für Veterinär-Pathologie, Justus-Liebig-Universität Giessen, Giessen, Germany (AK, HM, MR); Institut für Veterinär-Pathologie, Universität Leipzig, Leipzig, Germany (SM, MW); Tierärztliche Praxis, Kochstraße 42, Leipzig, Germany (WL)

Feline infectious peritonitis (FIP) is a fatal, coronavirus (CoV)-induced systemic disease in cats, characterized by granulomas in organs and granulomatous vasculitis. This study describes the morphologic features of granulomatous vasculitis in FIP as well as its development in the course of monocyte-associated feline CoV (FCoV) viremia in five naturally infected Domestic Shorthair cats with FIP. Monocyte-associated FCoV viremia was demonstrated by immunohistology, RNA in situ hybridization, and electron micropscopy. Granulomatous phlebitis at different stages of development was observed. Vasculitic processes ranged from attachment and emigration of FCoV-infected monocytes to vascular/perivascular granulomatous infiltrates with destruction of the vascular basal lamina. Monocytes as well as perivascular macrophages were activated because they were strongly positive for CD18 and expressed cytokines (tumor necrosis factor-{alpha} and interleukin-1ß) and matrix metalloproteinase-9. In addition, general activation of endothelial cells, represented by major histocompatibility complex II upregulation, was observed in all cases. These results confirm FIP as a monocyte-triggered systemic disease and demonstrate the central role of activated monocytes in FIP vasculitis.

Key words: Cats; feline coronavirus; feline infectious peritonitis; granulomatous vasculitis; monocyte-associated viremia; phlebitis.

Request reprints from Dr. A. Kipar, Department of Veterinary Pathology, Faculty of Veterinary Science, University of Liverpool, Crown Street, Liverpool L69 7ZJ (UK). E-mail: akipar{at}liverpool.ac.uk




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