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Macitentan and bosentan were supplied by Actelion Pharmaceuticals Ltd. Gelatin 7.5%, administered at 5?mL/kg, was used as vehicle for oral administration of the compounds by gavage. All results are presented as mean?��?SEM. Area between the mean arterial pressure vs. time curves (ABC) is expressed in mm?Hg?h, MAP or MPAP in mm?Hg, and HR in bpm. Differences between groups were analyzed using an unpaired Student t-test. Statistical significance http://www.selleckchem.com/products/Neratinib(HKI-272).html was defined as P ? 0.05. DSS rats developed an increase in MAP up to approximately 180?mm?Hg. MAP and HR baseline values were similar between the different experimental groups. After acute oral administration, macitentan dose-dependently decreased MAP in DSS rats. The maximal effective dose of macitentan was 30?mg/kg; this dose decreased MAP by 30?��?5?mm?Hg (Table?1). The maximal effect was reached at about 24?h after administration (Tmax). Acute oral administration of bosentan dose-dependently decreased MAP in DSS rats. At the maximal effective dose of 100?mg/kg, bosentan decreased MAP by 15?��?2?mm?Hg ( Table?1), with a Tmax at 6?h. No effect on HR was observed. Based on these data, the maximal effective doses of 30?mg/kg of macitentan and 100?mg/kg of bosentan were selected for the add-on study. Tmax was determined to be 6?h for bosentan and 24?h for macitentan. The use of maximal effective doses of macitentan and bosentan was confirmed using the add-on protocol: macitentan 30?mg/kg administered on top of macitentan 30?mg/kg did not cause an additional MAP decrease as compared to vehicle on top of macitentan (??29?��?2 and http://www.selleckchem.com/products/Roscovitine.html ??28?��?5?mm?Hg). Bosentan 100?mg/kg, administered when the maximal effect of bosentan 100?mg/kg was reached, did not induce an additional MAP decrease compared to vehicle on top of bosentan (??13?��?2 and ??14?��?3?mm?Hg, respectively; Fig.?2). Oral administration of macitentan 30?mg/kg, when the maximal effect of bosentan 100?mg/kg had been reached, decreased MAP by an additional 19?mm?Hg compared to vehicle (p? https://en.wikipedia.org/wiki/Quinapyramine by macitentan was 33?��?4?mm?Hg ( Fig.?2). Conversely, bosentan, administered orally at 100?mg/kg, when the maximal effect of macitentan 30?mg/kg had been reached, did not induce an additional MAP decrease compared to vehicle administered on top of macitentan 30?mg/kg ( Fig.?3). Bleomycin-treated rats developed an increase in MPAP of approximately 13?mm?Hg vs. saline-instilled rats. MPAP and HR baseline values were similar between the different experimental groups. Acute oral administration of macitentan and bosentan dose-dependently decreased MPAP in bleomycin rats (Table?1) without affecting HR (data not shown). At a dose of 30?mg/kg macitentan, the maximal decrease in MPAP was 12?��?3?mm?Hg, about 24?h after administration (Tmax). At the maximal effective dose of 300?mg/kg, bosentan decreased MPAP by 7?��?2?mm?Hg ( Table?1), with a Tmax around 6?h.