Bosentan Hydrate是一种内皮素(ET)受体拮抗剂，靶点有ET-A和ET-B，Ki分别为4.7 nM和95 nM。Bosentan竞争性拮抗[125I]标记的ET-1与人平滑肌细胞(ET-A受体)和人体胎盘素 (ET-B 受体)的特异性结合。Bosentan还可以抑制选择性的ET-B 配体与猪气管结合。离体大鼠主动脉(ET-A)中ET-1诱导的收缩以及大鼠气管中选择性ET-B激动剂sarafotoxin S6C诱导的收缩可以被Bosentan竞争性抑制(pA2分别为7.2 和6.0), 兔肠系膜上动脉中sarafotoxin S6C引起的血管内皮依赖性舒张也会被抑制(pA2= 6.7)。
Store at -20℃ for one year（Powder）；Store at 2-4℃ for two weeks；Store at -20℃ for six months after dissolution.
Ethanol ：2 mg/mL (3.51 mM)
DMSO ：93 mg/mL (163.3 mM)
Bosentan competitively antagonizes the specific binding of -labeled ET-1 on human smooth muscle cells (ET-A receptors)human placenta (ET-B receptors). Bosentan also inhibits the binding of selective ET-B ligands on porcine trachea. Contractions induced by ET-1 in isolated rat aorta (ET-A) and by the selective ET-B agonist sarafotoxin S6C in rat trachea are competitively inhibited by Bosentan (pA2= 7.2 and 6.0, respectively), as is the endothelium-dependent relaxation to sarafotoxin S6C in rabbit superior mesenteric artery (pA2= 6.7). The binding of 40 other peptides, prostaglandins, ions and neurotransmitters is not significantly affected by Bosentan, which shows its specificity for ET receptors.
Bosentan inhibits the presser response to big ET-1 both after i.v. and oral administration, with a long duration of action and no intrinsic agonist activity. Bosentan also inhibits the depressor and presser effect of ET-1 and sarafotoxin S6C. Its pharmacological profile makes Bosentan a potentially useful drug in the management of clinical disorders associated with vasoconstriction. Bosentan is the first oral non-peptide mixed ETA/B-receptor antagonist. Long-term treatment with Bosentan has markedly increased the survival, hemodynamics, and cardiac remodeling in rats with CHF. Bosentan decreases arterial BP to a similar degree as an angiotensin-converting enzyme (ACE) inhibitor. Administration of Bosentan in rats with CHF after acute MI significantly decreases arterial BP and has additive effect to that of an ACE inhibitor. Acute and chronical treatment with Bosentan also improves the systemic and pulmonary hemodynamics by a decrease in peripheral and pulmonary vascular resistance, and increase of cardiac output in patients with CHF.
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