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Renal amyloid‐A amyloidosis in cats: Characterization of proteinuria and biomarker discovery, and associations with kidney histology

Palizzotto, Carlo; Ferri, Felippo; Callegari, Carolina; Rossi, Francesco; Manfredi, Marcello; Carcangiu, Laura; Gerardi, Gabriele; Ferro, Silvia; Cavicchioli, Laura; Müller, Elizabeth; Weiss, Marco; Vogt, Anne‐Catherine; Lavatelli, Francesca; Ricagno, Stefano; Hurley, Karyl; Zini, Eric (2024). Renal amyloid‐A amyloidosis in cats: Characterization of proteinuria and biomarker discovery, and associations with kidney histology. Journal of Veterinary Internal Medicine, 38(1):205-215.

Abstract

BackgroundAmyloid A (AA) amyloidosis is a protein misfolding disease arising from serum amyloid A (SAA). Systemic AA amyloidosis recently was shown to have a high prevalence in shelter cats in Italy and was associated with azotemia and proteinuria.ObjectivesInvestigate urine protein profiles and diagnostic biomarkers in cats with renal AA amyloidosis.AnimalsTwenty‐nine shelter cats.MethodsCase‐control study. Cats with renal proteinuria that died or were euthanized between 2018 and 2021 with available necropsy kidney, liver and spleen samples, and with surplus urine collected within 30 days before death, were included. Histology was used to characterize renal damage and amyloid amount and distribution; immunohistochemistry was used to confirm AA amyloidosis. Urine protein‐to‐creatinine (UPC) and urine amyloid A‐to‐creatinine (UAAC) ratios were calculated, and sodium dodecyl sulfate‐agarose gel electrophoresis (SDS‐AGE) and liquid chromatography‐mass spectrometry (LC‐MS) of proteins were performed.ResultsTwenty‐nine cats were included. Nineteen had AA amyloidosis with renal involvement. Cats with AA amyloidosis had a higher UPC (median, 3.9; range, 0.6‐12.7 vs 1.5; 0.6‐3.1; P = .03) and UAAC ratios (median, 7.18 × 10$^{−3}$; range, 23 × 10$^{−3}$‐21.29 × 10$^{−3}$ vs 1.26 × 10$^{−3}$; 0.21 × 10$^{−3}$‐6.33 × 10$^{−3}$; P = .04) than unaffected cats. The SDS‐AGE identified mixed‐type proteinuria in 89.4% of cats with AA amyloidosis and in 55.6% without AA amyloidosis (P = .57). The LC‐MS identified 63 potential biomarkers associated with AA amyloidosis (P < .05). Among these, urine apolipoprotein C‐III was higher in cats with AA amyloidosis (median, 1.38 × 10$^{7}$; range, 1.85 × 10$^{5}$‐5.29 × 10$^{7}$ vs 1.76 × 10$^{6}$; 0.0 × 10$^{0}$‐1.38 × 10$^{7}$; P = .01). In the kidney, AA‐amyloidosis was associated with glomerulosclerosis (P = .02) and interstitial fibrosis (P = .05).Conclusions and Clinical ImportanceRenal AA amyloidosis is associated with kidney lesions, increased proteinuria and increased urine excretion of SAA in shelter cats. Additional studies are needed to characterize the role of lipid transport proteins in the urine of affected cats.

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:05 Vetsuisse Faculty > Veterinary Clinic > Department of Small Animals
Dewey Decimal Classification:570 Life sciences; biology
630 Agriculture
Scopus Subject Areas:Health Sciences > General Veterinary
Uncontrolled Keywords:General Veterinary
Language:English
Date:1 January 2024
Deposited On:10 Jan 2024 10:54
Last Modified:30 Oct 2024 02:40
Publisher:Wiley Open Access
ISSN:0891-6640
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1111/jvim.16920
PubMed ID:37991136
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  • Language: English
  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)

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