ArticleJournal of veterinary internal medicine2026
Characterization of the myocardial and renal renin-angiotensin system in normal cats and cats with hypertrophic cardiomyopathy.
Article in Journal of veterinary internal medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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7 authors.
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Abstract
backgroundThe tissue renin-angiotensin system (RAS) has not been characterized in cats. HYPOTHESIS/
objectivesTo quantify RAS enzyme activity and angiotensin peptide (AP) concentrations in myocardial and renal tissue obtained at necropsy from healthy cats and cats with hypertrophic cardiomyopathy (HCM). ANIMALS: A convenience sample of 17 adult purpose-bred cats, euthanized under other study protocols, with echocardiographically normal hearts (n = 8) or American College of Veterinary Internal Medicine stage B1 (n = 6) or C (n = 3) HCM.
methodsProspective study. Tissues were incubated with spiked angiotensin I (AngI) or II (AngII) under control and inhibitor conditions to assess relative enzyme contributions to AngII or angiotensin 1-7 (Ang1-7) formation. Freezing was delayed for 3 h in paired samples from 7 cats. Angiotensin peptides were also directly quantified in homogenized tissues.
resultsRenin-angiotensin system enzyme activity was present in necropsy tissues, which formed AngII and Ang1-7 when incubated with AP precursors. The median contribution of angiotensin-converting enzyme to AngII formation exceeded 85% in all tissues. The 90% confidence limits of the geometric mean of the ratio of the angiotensin production of paired samples met the equivalence requirement in 1/13 experiments. The AP concentrations were quantifiable and did not differ between cats with echocardiographically normal hearts and cats with HCM (myocardial AngI P = .11 and AngII P = .37; kidney AngI P = .84, AngII P = .73, and Ang 1-7 P = .84). CONCLUSIONS AND CLINICAL IMPORTANCE: Necropsy tissue RAS enzyme activity and some AP concentrations were quantifiable in this cohort. Renin-angiotensin system enzyme activity changed during a short (3 h) postmortem period.
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