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• W2019076541 abstract "Long-term renal effects of unilateral ureteral obstruction and the role of endothelin.BackgroundAngiotensin II (Ang II) and endothelin (ET) are involved in the alteration of renal function in unilateral ureteral obstruction (UUO). The renal response to Ang II following the reversal of a 24-hour UUO and the effect of ET blockade by bosentan during the time of obstruction were investigated.MethodsFollowing blockade of the endogenous production of Ang II by captopril, the renal response to Ang II was studied in rats 15 to 18 days after a 24-hour UUO (N = 10) or a sham operation (N = 9) both with (N = 10) and without (N = 8) bosentan treatment in the periobstruction period. Similar studies were performed in another group (N = 9) two months following the reversal of obstruction.ResultsIn the sham-operated group, Ang II reduced renal blood flow (RBF) by 42 ± 9% (P < 0.01), glomerular filtration rate (GFR) by 30 ± 8% (P < 0.01), urine volume (UV) by 44 ± 9% (P < 0.001), and absolute (UNaV) and fractional sodium excretion (FENa) by 52 ± 9% (P < 0.001) and 33 ± 9% (P = 0.054), respectively. In the previously obstructed kidney, Ang II did not change RBF but increased GFR by 106 ± 40% (P < 0.01), UV by 75 ± 21% (P < 0.001), UNaV by 190 ± 60% (P < 0.001), and FENa by 40 ± 13% (P < 0.05). Bosentan treatment in the obstructed group prevented these Ang II-induced effects and did not have any effect on the sham-operated kidney. Two months following reversal of the obstruction, the response of the kidney was similar to that of the control kidney.ConclusionTwenty-four–hour UUO results in a temporary abnormality in the renal response to Ang II, which is due, in part, to the actions of ET at the time of obstruction. Long-term renal effects of unilateral ureteral obstruction and the role of endothelin. Angiotensin II (Ang II) and endothelin (ET) are involved in the alteration of renal function in unilateral ureteral obstruction (UUO). The renal response to Ang II following the reversal of a 24-hour UUO and the effect of ET blockade by bosentan during the time of obstruction were investigated. Following blockade of the endogenous production of Ang II by captopril, the renal response to Ang II was studied in rats 15 to 18 days after a 24-hour UUO (N = 10) or a sham operation (N = 9) both with (N = 10) and without (N = 8) bosentan treatment in the periobstruction period. Similar studies were performed in another group (N = 9) two months following the reversal of obstruction. In the sham-operated group, Ang II reduced renal blood flow (RBF) by 42 ± 9% (P < 0.01), glomerular filtration rate (GFR) by 30 ± 8% (P < 0.01), urine volume (UV) by 44 ± 9% (P < 0.001), and absolute (UNaV) and fractional sodium excretion (FENa) by 52 ± 9% (P < 0.001) and 33 ± 9% (P = 0.054), respectively. In the previously obstructed kidney, Ang II did not change RBF but increased GFR by 106 ± 40% (P < 0.01), UV by 75 ± 21% (P < 0.001), UNaV by 190 ± 60% (P < 0.001), and FENa by 40 ± 13% (P < 0.05). Bosentan treatment in the obstructed group prevented these Ang II-induced effects and did not have any effect on the sham-operated kidney. Two months following reversal of the obstruction, the response of the kidney was similar to that of the control kidney. Twenty-four–hour UUO results in a temporary abnormality in the renal response to Ang II, which is due, in part, to the actions of ET at the time of obstruction." @default.
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• W2019076541 title "Long-term renal effects of unilateral ureteral obstruction and the role of endothelin" @default.
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