新型肽类化合物对内皮素受体的拮抗作用及其心血管药理活性的评价

目的评价新型肽类化合物的内皮素受体拮抗活性及其心血管药理活性。方法离体血管环实验及在体心功能实验。结果该类化合物能剂量依赖性地抑制内皮素诱发的大鼠主动脉血管条的收缩,对正常血压大鼠的血压、心率及心功能无显著影响。在脑卒中易感型自发性高血压大鼠上40,43和44号化合物po引起血压显著下降。结论该类化合物具有拮抗内皮素的药理学作用,对正常血压大鼠的血压、心率及心功能均无显著影响,部分化合物可使脑卒中易感型自发性高血压大鼠血压下降,在心脑血管疾病中可能有潜在的应用价值。

ANTAGONIZING EFFECTS OF NOVEL MULTIPEPTID ANALOGUES ON ENDOTHELIN RECEPTORS AND THEIR PHARMACOLOGICAL CHARACTERISTICS IN CARDIOVASCULAR SYSTEM

AIM: To investigate the antagonistic effects of the novel compounds on vasoconstriction induced by ET-1 and the effect on the blood pressure of stroke-prone spontaneously hypertensive rats. METHODS: Organ bath experiment and whole cardiac function experiment were used. RESULTS: The analogues of o-CPhe-D-Trp-D-Phe(-X)-OH showed good ability against endothelin biological effects. When X was displaced by 3-F, 3-Cl or 4-Cl, the novel compounds inhibit the vascular constriction induced by ET-1 in a concentration-dependent manner, the IC50 +/- L95 were (0.09 +/- 0.05), (0.15 +/- 0.06) or (0.11 +/- 0.03) mumol.L-1 respectively. The blood pressure of stroke-prone spontaneously hypertensive rats was decreased. No significant effect on cardiac function of rats was discovered. CONCLUSION: The results demonstrate that among the six kinds of compounds, those with o-CPhe-D-Trp-D-Phe (-X)-OH configuration showed good biological effects.