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Renal involvement in feline immunodeficiency virus infection: a clinicopathological study
Insights
Feline immunodeficiency virus (FIV) infection frequently causes kidney abnormalities in cats, including glomerulosclerosis and tubulointerstitial lesions. These findings highlight FIV-infected cats as a potential model for studying human immunodeficiency virus (HIV) associated nephropathy.
Area of Science:
- Veterinary Pathology
- Immunovirology
- Nephrology
Background:
- Feline immunodeficiency virus (FIV) is an established lentivirus affecting domestic cats worldwide.
- Renal complications are increasingly recognized in FIV-infected animals, but their pathogenesis remains incompletely understood.
- Human immunodeficiency virus (HIV)-associated nephropathy (HIVAN) shares pathological similarities with other lentiviral kidney diseases.
Purpose of the Study:
- To investigate the prevalence and characteristics of renal lesions in naturally FIV-infected cats.
- To correlate histopathological findings with clinical parameters of renal function and proteinuria.
- To evaluate FIV-infected cats as a potential animal model for HIVAN.
Main Methods:
- Histopathological examination of renal tissues from 15 FIV-infected cats.
- Immunohistochemical analysis for immunoglobulin and complement deposition (IgM, C3, IgG).
- Ultrastructural evaluation of glomerular and tubular changes.
- Assessment of serum urea nitrogen, creatinine, and urinary protein levels.
Main Results:
- Kidney abnormalities were detected in 12 of 15 (80%) FIV-infected cats.
- Common lesions included mesangial widening, glomerulosclerosis, and tubulointerstitial inflammation.
- Immunohistochemistry revealed IgM and C3 deposition in the mesangium, with occasional IgG.
- Severe lesions in 6 cats correlated with elevated blood urea nitrogen, creatinine, and heavy nonselective proteinuria.
- Histopathological features resembled those observed in human HIVAN.
Conclusions:
- Renal involvement is a frequent complication of natural FIV infection in cats.
- FIV-associated nephropathy exhibits pathological similarities to HIVAN.
- FIV-infected cats serve as a valuable preclinical model for investigating HIV-associated kidney disease mechanisms and potential therapies.
Abstract:
Renal tissues from 15 cats naturally infected with feline immunodeficiency virus (FIV) were examined histologically, immunohistochemically and ultrastructurally. Renal function and urinary proteins were also studied. Kidney abnormalities were found in 12 cats and were characterized by mesangial widening with segmental to diffuse glomerulosclerosis and presence of IgM and C3, and scanty IgG deposits in the mesangium. Tubulointerstitial lesions were also present. In 6 cats the lesions were severe enough to cause marked increase in blood urea nitrogen and creatinine, and heavy glomerular nonselective proteinuria. These findings suggest that a renal involvement is a frequent occurrence in FIV-infected cats. As the histopathological features observed were similar to those described in HIV-infected patients, FIV-infected cats may represent a valuable model for a better understanding of HIV-associated nephropathy in humans.