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氯通道阻断剂对大鼠主动脉环收缩和舒张反应的影响 被引量:1

Effects of chloride channel blockers on the contractile and relaxative responses in rat aorta rings
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摘要 目的 观察氯通道阻断剂DIDS和呋塞米(furosemide)对苯肾上腺素 (phenylephrine,PHE)引起的收缩反应和ATP引起的内皮依赖性舒张效应的影响。方法 采用内皮完整和去内皮的大鼠离体主动脉环 ,进行等长张力实验。结果 DIDS(1~ 30 0 μmol·L-1)和furosemide(10~ 32 0μmol·L-1)均浓度依赖性抑制PHE引起的收缩反应 ,但对内皮完整的血管环抑制率和去内皮的血管环抑制率不同 ,DIDS的IC50 分别为 (12 0± 8 0 ) μmol·L-1和 (2 8 3± 7 3)μmol·L-1;furosemide的IC50 分别为 (17 9± 6 6 ) μmol·L-1和 (41 0± 15 6 ) μmol·L-1。DIDS(10 0 μmol·L-1)对 10μmol·L-1和 10 0 μmol·L-1的ATP舒张无影响 ,但可增加 1mmol·L-1ATP引起的舒张效应 (P <0 0 5 ) ;furosemide(2 0 0μmol·L-1)对 10 μmol·L-1的ATP舒张无影响 ,但可使 10 0μmol·L-1ATP和 1mmol·L-1ATP引起的舒张效应增强 (P<0 0 5 )。结论 DIDS和furosemide可抑制PHE引起的收缩 ,且对带内皮血管环的抑制率均大于去内皮血管环的抑制率 ,并可增加ATP引起的内皮依赖性舒张。 AIM To study the effects of DIDS and furosemide on the contraction induced by phenylephrine and the endothelium-dependent relexation induced by ATP. METHODS Measurement of isometric force of rat thoracic aortae rings with and without endothelium. RESULTS DIDS(1~300 μmol·L -1 ) and furosemide(10~320 μmol·L -1 ) inhibited the contractile response induced by phenylephrine in a concentration-dependent manner. The inhibitory rate was different between aortic ring endothelium-intact and that endothelium-denuded. The values of IC_ 50 for DIDS were (12.0±8.0) μmol·L -1 and (28.3±7.3) μmol·L -1 respectively,while the values of IC_ 50 for furosemide were (17.9±6.6) μmol·L -1 and (41.0±15.6) μmol·L -1 respectively. DIDS(10 μmol·L -1 ) did not chang ATP-induced vasodilative effect at the concentrations of 10 μmol·L -1 and 100 μmol·L -1 , but enhanced the relaxation induced by 1 mmol·L -1 ATP. Furosemide (20 μmol·L -1 ) had no effect on the relaxation induced by ATP(10 μmol·L -1 ), but prolonged the relaxation when the concentration of ATP added to 100 μmol·L -1 and 1 mmol·L -1 ( P< 0.01). CONCLUSION Both DIDS and furosemide could inhibit the contraction induced by phenylephrine. The inhibitory rate in the aortic ring with endothelium was higher than that of no endothelium. These chloride channel blockers could increased the endothelium-dependent vasodilative response to ATP.
出处 《中国药理学通报》 CAS CSCD 北大核心 2003年第5期565-568,共4页 Chinese Pharmacological Bulletin
基金 广东省卫生厅科学基金资助课题 NoB2 0 0 0 0 68
关键词 Cl^-通道阻断剂 胸主动脉 苯肾上腺素 ATP chloride channel blockers thoracic aorta phenylephrine(PHE) ATP
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参考文献13

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共引文献6

同被引文献22

  • 1钱健,朱建华.参麦注射液对大鼠离体胸主动脉血管收缩反应的影响[J].浙江临床医学,2004,6(8):646-647. 被引量:7
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