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- W2000620003 abstract "SUMMARY 1. Medullary blood flow (MBF) is important in the long‐term control of arterial pressure. However, it is unclear which vascular elements regulate MBF. 2. Exogenous endothelin (ET)‐1 decreases cortical more than medullary blood flow. We hypothesized that ET‐1 would therefore constrict afferent (AA) and efferent arterioles (EA) of juxtamedullary glomeruli less than those of cortical glomeruli. 3. Mean arterial pressure, renal blood flow and cortical (CBF) and medullary (MBF) blood flow, via laser‐Doppler flowmetry, were measured before and after intrarenal ET‐1 (2 ng/kg per min; n = 6) or vehicle ( n = 6) in anaesthetized rabbits. Kidneys were perfusion fixed, vascular casts formed, lumen diameters measured via scanning electron microscopy and relative resistance calculated. 4. Mean arterial pressure was not significantly affected by ET‐1 infusion. Cortical glomerular arteriole lumen diameters were significantly reduced in the ET‐1‐infused group (AA approximately 30%, EA approximately 18%; P A < 0.01), compatible with the decrease in CBF (42 ± 3%; P GT < 0.01). Juxtamedullary arteriole lumen diameters were also significantly reduced in the ET‐1‐infused group (AA approximately 34%, EA approximately 21%; P A < 0.01); however, MBF did not decrease. 5. In conclusion, our data suggest that juxtamedullary arterioles are not of primary importance in the regulation of MBF because, despite reductions in juxtamedullary arteriole diameters in response to ET‐1, MBF was not decreased." @default.
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- W2000620003 date "2004-08-01" @default.
- W2000620003 modified "2023-10-15" @default.
- W2000620003 title "EFFECT OF ENDOTHELIN-1 ON REGIONAL KIDNEY BLOOD FLOW AND RENAL ARTERIOLE CALIBRE IN RABBITS" @default.
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- W2000620003 doi "https://doi.org/10.1111/j.1440-1681.2004.04036.x" @default.
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