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Inhibition of endothelial derived relaxing factor (EDRF) aggravates ischemic acute renal failure in anesthetized rats

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Summary

The relative importance of endothelial derived relaxing factor (EDRF)/nitric oxide (NO) in maintaining kidney function in normal condition and in acute renal failure (ARF) were evaluated in inactin anesthetized rats. ARF was induced by unilateral occlusion of the left renal artery (40 min) followed by reperfusion, with the contralateral kidney serving as normal control. This protocol resulted in marked reductions in renal plasma flow (RPF), glomerular filtration rate (GFR) and increases in fractional sodium excretion (FENa) and urinary protein excretion in the post-ischemic kidney in comparison to the contralateral normal kidney. Administration of the nitric oxide (NO) synthase inhibitor NG — monomethyl-L-arginine (0.25 mg/kg per min, L-NMMA) exacerbated the ischemia-induced changes in renal functions as reflected by further reductions in urine flow (V), GFR, marked sodium wasting and renal edema. Pretreatment of the animals with NO precursor L-arginine (2.5 mg/kg per min, L-Arg) abolished the detrimental effects of L-NMMA in ARE In contrast, D-Arginine (2.5 mg/kg per min, DArg) failed to reverse the detrimental effects of L-NMMA. Infusion of L-Arg alone also resulted in improvements in RPF and GFR in the ischemic kidney. The results of the present study suggest that the function of the ischemic kidney is sustained by EDRF/NO and is thus more sensitive to NO synthase inhibition.

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Authors and Affiliations

  1. Schering-Plough Research Institute, 2015 Galloping Hill Road, 07033-0539, Kenilworth, NJ, USA

    Madhu S. Chintala, Peter J.S. Chin, Subbarao Vemulapalli, Robert W. Watkins & Edmund J. Sybertz

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  1. Madhu S. Chintala
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  2. Peter J.S. Chin
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  3. Subbarao Vemulapalli
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  4. Robert W. Watkins
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  5. Edmund J. Sybertz
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Correspondence to M. S. Chintala at the above address

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Chintala, M.S., Chin, P.J., Vemulapalli, S. et al. Inhibition of endothelial derived relaxing factor (EDRF) aggravates ischemic acute renal failure in anesthetized rats. Naunyn-Schmiedeberg's Arch Pharmacol 348, 305–310 (1993). https://doi.org/10.1007/BF00169160

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  • DOI: https://doi.org/10.1007/BF00169160

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