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Immunofluorescence staining for the detection of immunoglobulins and complement (C3) in dogs with renal disease

¹ Dipartimento di Patologia Animale, Università degli Studi di Torino, Via L da Vinci 44, 10095 Grugliasco (Torino), Italy

Renal cortical biopsies from 74 dogs with different degrees of renal failure were studied by immunofluorescence to assess the frequency and extent of the deposition of immunoglobulins G, M and A (IgG, IgM, IgA) and complement C3. The dogs were divided into two groups on the basis of their clinical signs, and standard histological and electron microscopical examinations, according to whether their disease was an immune-mediated nephropathy (IMN) or a non-immune-mediated nephropathy (NIMN). In the dogs with an IMN there was strong immunofluorescence due to IgG in the mesangium and the glomerular basement membrane and to IgM in the mesangium. The mechanism of immune complex trapping in the glomerulus also resulted in positive reactions to IgM in the dogs with an NIMN.

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