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Abstract

Alterations in renal structure and function in a rat model of cyclosporine nephrotoxicity.

N M Jackson, C H Hsu, G E Visscher, M A Venkatachalam and H D Humes
Journal of Pharmacology and Experimental Therapeutics August 1987, 242 (2) 749-756;
N M Jackson
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C H Hsu
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G E Visscher
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M A Venkatachalam
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H D Humes
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Abstract

Adult male Sprague-Dawley rats maintained on a low sodium diet were administered 100 mg of cyclosporine per kg b.wt. per day s.c. for 4 to 10 days. Serum urea nitrogen was significantly elevated by day 4 and continued to rise, whereas serum creatinine was not elevated above control until day 10. Morphologic examination of perfusion-fixed kidneys from cyclosporine-treated rats revealed focal areas of tubular atrophy and interstitial fibrosis in the outer cortex and a generalized increase in interstitial cells in the outer medulla. No areas of acute tubular necrosis were identified. The effect of this dose of cyclosporine on renal hemodynamics was examined in conscious restrained rats. Renal blood flow, measured by microsphere injection, was 70% of control after four daily doses and remained near this level after eight daily doses. The glomerular filtration rate, measured by iodothalamate clearance, was 70% of control after four doses but fell to 34% of control after eight doses. [3H]Thymidine incorporation into renal DNA was used as a sensitive index of renal cell proliferation after cyclosporine administration (100 mg/kg/day). [3H]Thymidine incorporation was increased over control 3-fold in the outer cortex, 7-fold in the inner cortex and 11-fold in the medullary-papillary regions of the kidney after eight daily doses of cyclosporine. Histoautoradiographic examination of renal sections revealed an increase in the number of labeled nuclei in all three regions of the kidney from rats treated with cyclosporine. Morphometric analysis demonstrated that the majority of proliferating cells were located in the interstitium and not in renal tubules.(ABSTRACT TRUNCATED AT 250 WORDS)

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Journal of Pharmacology and Experimental Therapeutics
Vol. 242, Issue 2
1 Aug 1987
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Abstract

Alterations in renal structure and function in a rat model of cyclosporine nephrotoxicity.

N M Jackson, C H Hsu, G E Visscher, M A Venkatachalam and H D Humes
Journal of Pharmacology and Experimental Therapeutics August 1, 1987, 242 (2) 749-756;

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Abstract

Alterations in renal structure and function in a rat model of cyclosporine nephrotoxicity.

N M Jackson, C H Hsu, G E Visscher, M A Venkatachalam and H D Humes
Journal of Pharmacology and Experimental Therapeutics August 1, 1987, 242 (2) 749-756;
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