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- W2074920579 abstract "1. To determine whether differential release of products of arachidonic acid metabolism, via the cyclo-oxygenase pathway, underlies the diversity of responses of regional kidney perfusion to vasoactive agents, we tested the effects of intravenous indomethacin on responses to renal arterial bolus doses of vasoactive agents in pentobarbitone-anaesthetized rabbits. 2. Total renal blood flow (RBF) and regional kidney perfusion were determined by transit time ultrasound flowmetry and laser-Doppler flowmetry, respectively. 3. Responses of regional kidney blood flow to vasoactive agents were diverse: noradrenaline reduced cortical but not medullary perfusion, [Phe 2,Ile 3,Orn 8]-vasopressin reduced medullary perfusion more than cortical perfusion, endothelin-1 and angiotensin II increased medullary perfusion in the face of reduced cortical perfusion, while acetylcholine, bradykinin and the nitric oxide donor methylamine hexamethylene methylamine (MAHMA) NONOate all increased both cortical and medullary perfusion. 4. Indomethacin administration was followed by reductions in total RBF (17 +/- 6%), cortical perfusion (13 +/- 5%) and medullary perfusion (40 +/- 8%). Angiotensin II- and endothelin-1-induced increases in medullary perfusion were abolished by indomethacin, but indomethacin had no significant effects on responses of regional kidney perfusion to acetylcholine, bradykinin, MAHMA NONOate, noradrenaline and [Phe 2,Ile 3,Orn 8]-vasopressin. 5. Our results suggest that vasodilator cyclo-oxygenase products contribute to the maintenance of resting renal vascular tone, particularly in vascular elements controlling medullary perfusion. Cyclo-oxygenase products also appear to mediate endothelin-1- and angiotensin II-induced increases in medullary perfusion. However, regionally specific engagement of cyclo-oxygenase-dependent arachidonic acid metabolism does not appear to contribute to the differential effects of noradrenaline and [Phe 2,Ile 3,Orn 8]-vasopressin on cortical and medullary perfusion." @default.
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- W2074920579 date "2002-10-01" @default.
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- W2074920579 title "Effects of indomethacin on responses of regional kidney perfusion to vasoactive agents in rabbits" @default.
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- W2074920579 doi "https://doi.org/10.1046/j.1440-1681.2002.03742.x" @default.
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