Figueiredo EL, Magalhães CA, Belli KC, Mandil A, Garcia JCF, Araújo RA, Figueiredo AFDS, Pellanda LC. Human Tissue Kallikrein Activity in Angiographically Documented Chronic Stable Coronary Artery Disease.
Arq Bras Cardiol 2015;
105:457-565. [PMID:
26351984 PMCID:
PMC4651403 DOI:
10.5935/abc.20150109]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Accepted: 05/15/2015] [Indexed: 01/22/2023] Open
Abstract
Background
Human tissue kallikrein (hK1) is a key enzyme in the kallikrein–kinin system
(KKS). hK1-specific amidase activity is reduced in urine samples from hypertensive
and heart failure (HF) patients. The pathophysiologic role of hK1 in coronary
artery disease (CAD) remains unclear.
Objective
To evaluate hK1-specific amidase activity in the urine of CAD patients
Methods
Sixty-five individuals (18–75 years) who underwent cardiac catheterism (CATH) were
included. Random midstream urine samples were collected immediately before CATH.
Patients were classified in two groups according to the presence of coronary
lesions: CAD (43 patients) and non-CAD (22 patients). hK1 amidase activity was
estimated using the chromogenic substrate D-Val-Leu-Arg-Nan. Creatinine was
determined using Jaffé’s method. Urinary hK1-specific amidase activity was
expressed as µM/(min · mg creatinine) to correct for differences
in urine flow rates.
Results
Urinary hK1-specific amidase activity levels were similar between CAD [0.146
µM/(min ·mg creatinine)] and non-CAD [0.189
µM/(min . mg creatinine)] patients (p = 0.803) and remained
similar to values previously reported for hypertensive patients [0.210
µM/(min . mg creatinine)] and HF patients [0.104
µM/(min . mg creatinine)]. CAD severity and hypertension were
not observed to significantly affect urinary hK1-specific amidase activity.
Conclusion
CAD patients had low levels of urinary hK1-specific amidase activity, suggesting
that renal KKS activity may be reduced in patients with this disease.
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