IC50: 0.09 μM human platelets
BAY 41-8543 is a soluble guanylate cyclase (sGC) stimulator.
Soluble guanylate cyclase (sGC) has been identified as the primary cellular receptor for nitric oxide (NO). NO can bind and activate a heme group in sGC, initiating the conversion of GTP to the second messenger cyclic GMP (cGMP).
In vitro: Previous study found that BAY 41-8543 could concentration-dependently stimulate the recombinant sGC up to 92-fold. Moreover, BAY 41-8543 and NO had synergistic effects over a wide range of concentrations. Similar results were shown that BAY 41-8543 stimulated the sGC directly and further made the enzyme more sensitive to its endogenous activator NO. In addition, BAY 41-8543 was found to be a potent relaxing agent of aortas, saphenous arteries, coronary arteries and veins with IC50-values in the nm range [1].
In vivo: In anaesthetized dogs, i.v. injections of BAY 41-8543 could cause a dose-dependent decrease in blood pressure and cardiac oxygen consumption as well as an increase in coronary blood flow and heart rate. In anaesthetized normotensive rats, BAY 41-8543 produced a dose-dependent and long-lasting blood pressure lowering effect. Moreover, a dose-dependent and long-lasting decrease in blood pressure was also observed in conscious spontaneously hypertensive rats with a threshold dose of 0.1 mg/kg p.o. [2].
Clinical trial: So far, no clinical study has been conducted.
References:
1. Stasch, J.P.,Alonso-Alija, C.,Apeler, H., et al. Pharmacological actions of a novel NO-independent guanylyl cyclase stimulator, BAY 41-8543: In vitro studies. British Journal of Pharmacology 135, 333-343 (2002).
2. Stasch, J.P.,Dembowsky, K.,Perzborn, E., et al. Cardiovascular actions of a novel NO-independent guanylyl cyclase stimulator, BAY 41-8543: in vivo studies. British Journal of Pharmacology 135, 344-355 (2002).