Simultaneous blockade of the cyclooxygenase and L-arginine-nitric oxide pathways prevents the antiarrhythmic effects of classical preconditioning (part 16)

classical preconditioning (part 16)

Indeed, inhibition of the generation of these substances before short preconditioning occlusions made preconditioning almost impossible. However, when preconditioning was performed in the absence of L-NAME and meclofenamate, and thus the protection was allowed to develop, and when the two inhibitors were then administered only before the prolonged occlusion, antiarrhythmic protection was largely preserved. The effects of complete reversal of the antiarrhythmic effect of preconditioning by the simultaneous inhibition of these two mediators were similar to those seen when the effects of bradykinin were inhibited with an antagonist (icati-bant) at bradykinin (B2) receptors . When icatibant was given before preconditioning, only 50% of the dogs survived the preconditioning procedure. CONCLUSIONS
Simultaneous protection of the generation of both nitric oxide and prostacyclin in anesthetized dogs completely abolished the antiarrhythmic effects of preconditioning. The results suggest that both nitric oxide and prostacyclin are generated during the preconditioning procedure, probably as a result of early bradykinin release. Released nitric oxide and prostacyclin, generated in endothelial cells, may diffuse to the cardiac myocytes (and platelets) and trigger signal transduction mechanisms that ultimately lead to antiarrhythmic protection. Visit the best pharmacy that thousands of international customers already chose to be their favorite one and see how easy it can be for you to get that proventil inhaler in the amount required for your treatment spending a lot less money than otherwise.

Category: Cardiology

Tags: Cyclooxygenase pathway, Ischemic preconditioning, L-arginine-nitric oxide pathway

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