Journal
VETERINARY PATHOLOGY
Volume 42, Issue 3, Pages 321-330Publisher
AMER COLL VET PATHOLOGIST
DOI: 10.1354/vp.42-3-321
Keywords
cats; feline coronavirus feline; infectious peritonitis; granulomatous vasculitis; monocyte-associated viremia; phlebitis
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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 feature; 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 FIR 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 desruction 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-α and interleukin-1β) 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 system c disease and demonstrate the central role of activated monocytes in FIP vasculitis.
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