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- Title
Production and metabolic clearance of calcitriol in acute renal failure.
- Authors
Hsu, Chen H.; Patel, Sanjeev; Young, Eric W.; Simpson, Robert U.
- Abstract
Metabolic clearance rate (MCR) and production rate (PR) of calcitriol were studied three and seven days after ischemic acute tubular necrosis (ATN). Creatinine clearance was decreased three days after clamping the renal arteries (0.42 ± 0.03 ml/min/100 g, N = 6 in ATN vs. 0.68 ± 0.09, N = 7 m sham controls; P < 0.001). Plasma concentrations (24.1 ± 1.9 pg/ml) and PR of calcitriol (9.8 ± 0.91 ng/kg/day) were significantly lower m ATN rats three days after ischemic insult when compared to sham control rats, respectively (76.6 ± 7.3 pg/ml, and 29.6 ± 3.3 ng/kg/day, both P < 0.01). The MCRs of calcitriol were not different between ATN (0.28 ± 0.02 ml/min/kg).and sham control rats (0.27 ± 0.01). By the seventh day after ischemic injury, when creatinine clearance of ATN rats returned to normal, both the PR and plasma concentrations of calcitriol also returned to normal values in these animals. In order to assess the effect of uremia on calcitriol metabolism, MCR and PR of calcitriol were measured in rats with reinfusion of their urines for 24 hours. The PR of calcitriol was significantly decreased (9.42 ± 1.21; vs. controls, 20.5 ± 2.9 ng/kg/day, P < 0.001) in uremic animals, rats decreased PR of calcitriol was also accompanied by decreased MCR of calcitriol, plasma concentrations of calcitriol of the uremic rats with intact kidneys remained within normal values. We conclude that the PR of calcitriol is decreased early in ATN rats. Although the MCR was not decreased in mild ATN rats, it may decrease in severe acute renal failure.
- Subjects
DRUG metabolism; ACUTE kidney failure; KIDNEY diseases; NECROSIS; CREATININE; RENAL artery; METABOLISM
- Publication
Kidney International, 1988, Vol 33, Issue 2, p530
- ISSN
0085-2538
- Publication type
Article
- DOI
10.1038/ki.1988.30