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  • Title: Angiotensin converting enzyme inhibitor therapy in children with Alport syndrome: effect on urinary albumin, TGF-beta, and nitrite excretion.
    Author: Adler L, Mathew R, Futterweit S, Frank R, Gauthier BG, Kashtan CE, Trachtman H.
    Journal: BMC Nephrol; 2002 Feb 14; 3():2. PubMed ID: 11869456.
    Abstract:
    BACKGROUND: Angiotensin converting enzyme inhibitors are routinely prescribed to patients with chronic kidney disease because of their known renoprotective effects. We evaluated the effect of short-term therapy with the angiotensin converting enzyme inhibitor, enalapril, in early Alport syndrome, defined as disease duration less than 10 years and a normal glomerular filtration rate. METHODS: 11 children with early Alport syndrome were investigated. Two consecutive early morning urine specimens were collected at the start of the study for measurement of urinary creatinine, total protein, albumin, TGF-beta, and nitrite excretion. Patients were treated with enalapril, congruent with 0.2 mg/kg/day, once a day for 14 days. Two early morning urine specimens were collected on days 13 and 14 of enalapril treatment and two weeks later for measurement of urinary creatinine, total protein, albumin, TGF-beta, and nitrite excretion. RESULTS: Prior to treatment, urinary excretion of transforming growth factor-beta and nitrite, the major metabolite of nitric oxide, was within normal limits in all patients. Administration of enalapril for 2 weeks did not alter urinary albumin, transforming growth factor-beta, or nitrite excretion. CONCLUSION: These findings suggest that early Alport syndrome represents a disease involving exclusively intrinsic glomerular barrier dysfunction. At this stage of the illness, there is no evidence of angiotensin II-mediated proteinuria or increased production of transforming growth factor-beta and, therefore, routine treatment with an angiotensin converting enzyme inhibitor may not be warranted.
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