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Increased Urinary Angiotensin-Converting Enzyme 2 in Renal Transplant Patients with Diabetes
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Increased Urinary Angiotensin-Converting Enzyme 2 in Renal Transplant Patients with Diabetes
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Journal Article
Increased Urinary Angiotensin-Converting Enzyme 2 in Renal Transplant Patients with Diabetes
2012
Overview
Angiotensin-converting enzyme 2 (ACE2) is expressed in the kidney and may be a renoprotective enzyme, since it converts angiotensin (Ang) II to Ang-(1-7). ACE2 has been detected in urine from patients with chronic kidney disease. We measured urinary ACE2 activity and protein levels in renal transplant patients (age 54 yrs, 65% male, 38% diabetes, n = 100) and healthy controls (age 45 yrs, 26% male, n = 50), and determined factors associated with elevated urinary ACE2 in the patients. Urine from transplant subjects was also assayed for ACE mRNA and protein. No subjects were taking inhibitors of the renin-angiotensin system. Urinary ACE2 levels were significantly higher in transplant patients compared to controls (p = 0.003 for ACE2 activity, and p≤0.001 for ACE2 protein by ELISA or western analysis). Transplant patients with diabetes mellitus had significantly increased urinary ACE2 activity and protein levels compared to non-diabetics (p<0.001), while ACE2 mRNA levels did not differ. Urinary ACE activity and protein were significantly increased in diabetic transplant subjects, while ACE mRNA levels did not differ from non-diabetic subjects. After adjusting for confounding variables, diabetes was significantly associated with urinary ACE2 activity (p = 0.003) and protein levels (p<0.001), while female gender was associated with urinary mRNA levels for both ACE2 and ACE. These data indicate that urinary ACE2 is increased in renal transplant recipients with diabetes, possibly due to increased shedding from tubular cells. Urinary ACE2 could be a marker of renal renin-angiotensin system activation in these patients.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Adult
/ Aged
/ Angiotensin converting enzyme inhibitors
/ Angiotensin-converting enzyme 2
/ Biology
/ Diabetes
/ Enzyme-linked immunosorbent assay
/ Enzymes
/ Female
/ Humans
/ Kidneys
/ Kinases
/ Male
/ Medicine
/ mRNA
/ Patients
/ Peptidyl-Dipeptidase A - urine
/ Proteins
/ Renin
/ Renin-Angiotensin System - physiology
/ RNA
/ Rodents
/ Shedding
/ Studies
/ Urine
