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. 1995 Mar;114(6):1149–1158. doi: 10.1111/j.1476-5381.1995.tb13327.x

Modulation by stereoselective inhibition of cyclo-oxygenase of electromechanical coupling in the guinea-pig isolated renal pelvis.

P Santicioli 1, G Carganico 1, S Meini 1, S Giuliani 1, A Giachetti 1, C A Maggi 1
PMCID: PMC1510368  PMID: 7620704

Abstract

1. The effects of the (S)- and (R)-enantiomers of the cyclo-oxygenase (COX) inhibitor, ketoprofen, have been investigated on the spontaneous activity of the guinea-pig isolated renal pelvis and on electrical field stimulation-(EFS) induced contractions of the guinea-pig ureter in comparison with the effects of the achiral COX inhibitor, indomethacin. 2. (S)-ketoprofen (0.1-100 microM) produced a concentration- and time-dependent inhibition of the spontaneous myogenic activity of the renal pelvis. The maximal inhibitory effect (% inhibition of motility index) averaged 29, 42, 47 and 56% inhibition of control values at 0.1, 1, 10 and 100 microM. The (R)-enantiomer was ineffective up to 10 microM. 3. Indomethacin (0.1-100 microM) likewise produced a concentration- and time-dependent inhibition of spontaneous motility of the isolated renal pelvis: its maximal inhibitory effect was larger than that produced by (S)-ketoprofen and averaged 21, 40, 69 and 95% inhibition of motility index at 0.1, 1, 10 and 100 microM respectively. In the presence of a maximally effective (100 microM) concentration of (S)-ketoprofen, 100 microM indomethacin produced > 90% inhibition of residual motility. 4. In the guinea-pig isolated ureter, phasic contractions were induced by EFS (5 ms pulse width, 60 V): (S)-ketoprofen (100-500 microM) had no effect on the EFS-evoked contractions. Indomethacin (100-500 microM) produced a concentration-dependent inhibition and/or suppression of the EFS-evoked contractions. When contraction of the ureter was evoked by 80 mM KCl, indomethacin produced about 30 and 80% inhibition at 100 and 300 microM, respectively, while (S)-ketoprofen (300 microM) was ineffective. 5. The effect of (S)-ketoprofen or indomethacin (10 microM each) on the propagation of myogenic impulses along the ureter was determined by use of a three chamber organ bath. The renal end of the ureter was electrically stimulated while recording the mechanical activity of the renal and bladder ends of the ureter: addition of either (S)-ketoprofen or indomethacin (10 microM) did not effect propagation of impulses from the renal to the bladder end of the ureter, while nifedipine (10 microM) promptly blocked the propagated contractions. 6. In sucrose gap experiments, (S)-ketoprofen (10-100 microM) produced a time-dependent shortening of spontaneous action potentials of the guinea-pig renal pelvis and reduced the amplitude and duration of the accompanying phasic contractions. Indomethacin (10 microM) produced comparable effects on the same parameters and significantly reduced the maximal amplitude of depolarization of the pacemaker potential.(ABSTRACT TRUNCATED AT 400 WORDS)

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Selected References

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