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  • Title: Elevated urinary prostaglandin excretion and the effect of indomethacin on renal function in incipient diabetic nephropathy.
    Author: Mathiesen ER, Hommel E, Olsen UB, Parving HH.
    Journal: Diabet Med; 1988 Mar; 5(2):145-9. PubMed ID: 2964980.
    Abstract:
    We investigated whether the glomerular synthesis of prostaglandins modulates the glomerular filtration rate and urinary albumin excretion in incipient diabetic nephropathy (defined as urinary albumin excretion between 30 and 300 mg/24 h (microalbuminuria) in two out of three sterile ketone-free 24-h urine collections in patients having insulin-dependent diabetes mellitus (IDDM) without hypertension or other kidney disease). The urinary excretion of prostaglandin E2 was significantly elevated in 8 insulin-dependent diabetic patients with incipient nephropathy as compared with 9 normoalbuminuric IDDM patients and 11 healthy controls: 317 (182-1273); 95 (67-225); 132 (54-263) pg/min, respectively (2p less than 0.01). Glomerular filtration rate (single bolus 51Cr-EDTA technique) and albuminuria (radioimmunoassay) were measured twice within 2 weeks in 8 females having IDDM with incipient nephropathy. The study design was a randomized double-blind trial with the patients receiving either indomethacin (150 mg/day) or placebo for 3 days prior to the kidney function studies. Indomethacin treatment induced a significant reduction in urinary prostaglandin E2 excretion (73%) (2p less than 0.01), urinary albumin excretion rate diminished from 207 (63-253) to 87 (49-147) mg/24 h (2p less than 0.01), fractional clearance of albumin declined (70%) (2p less than 0.01). Glomerular filtration rate remained stable (108 (88-133) versus 110 (95-142) ml/min). Blood glucose and blood pressure were comparable during the placebo and indomethacin treatment (12.6 +/- 3 versus 13.4 +/- 5 mmol/l and 122/79 +/- 3/9 versus 122/82 +/- 4/10 mmHg, respectively). Our results suggest that enhanced glomerular synthesis of vasodilating prostaglandins may accelerate microalbuminuria in incipient diabetic nephropathy.
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