학술논문
茉莉花提取物的舒血管作用 / Vasodilation Effect of Extract of Jasminum samba
Document Type
Academic Journal
Author
Source
医药导报 / Herald of Medicine. (6):737-741
Subject
Language
Chinese
ISSN
1004-0781
Abstract
目的：观察中药茉莉花提取物(EJs)对大鼠离体胸主动脉环的舒血管作用并探讨其作用机制。方法采用离体血管环灌流装置,观察 EJs 对苯肾上腺素(PE)或氯化钾(KCl)预收缩血管的影响。检测左旋硝基精氨酸甲酯(L-NAME)和氯化钡(BaCl2),格列本脲(Gli)对0.5,1,2,4,8 g·L-1 EJs 舒血管作用的影响；观察 EJs 对氯化钙(CaCl2)及 PE在无钙液中收缩影响；激光扫描共聚焦显微镜技术检测血管平滑肌细胞内钙浓度。结果在内皮完整血管上,EJs 依赖性地降低 PE 或 KCl 预收缩血管的张力,最大舒张幅度分别为(105.0±3.2)%,(78.0±6.5)%； L-NAME 明显削弱对 EJs的舒血管作用(P<0.01),最大舒张幅度为(58.0±6.9)%；BaCl2,Gli 均能明显削弱 EJs 的舒血管作用(P <0.01),最大舒张幅度分别为(37.0±5.2)%,(78.0±10.0)%；在无钙环境下,EJs 能抑制 PE 引起去内皮主动脉环短暂收缩(P <0.01),最大收缩幅度(70.0±6.3)%,EJs 能抑制0.5~8 mmol·L-1 CaCl2引起的收缩(P <0.01),血管收缩幅度降低(65.0±3.2)%。4,8 g·L-1 Ejs 钙 Fmax / F0分别为(2.0±0.2)和(1.5±0.2)。结论 EJs 能够浓度依赖性舒张大鼠胸主动脉,其作用机制可能与促进一氧化氮释放、激活多个 K+通道,减少细胞内钙离子浓度有关。
Objective To observe the vasodilation effect of extract of Jasminum samba (EJs), a kind of traditional Chinese medicine, on ex vivo rat thoracic aortic rings, and to investigate its mechanism. Methods On ex vivo aortic ring perfusion device, influence of EJs on contraction of the aorta induced by phenylephrine (PE) or potassium chloride (KCl) was observed. Influence of N-nitro-L-arginine-methylester ( L-NAME ), barium chloride ( BaCl2 ), glibenclamide ( Gli ) on vasodilating effect of EJs (0. 5, 1, 2, 4, 8 g·L-1 ) was detected. Effect of EJs on the contraction of calcium chloride (CaCl2 ) and PE in Ca2+-free medium was detected. [ Ca2+ ] i in vascular smooth muscle cells was determined by using laser scanning confocal microscope (LSCM). Results In blood vessels with intact endothelium, EJs concentration-dependently decreased PE- or KCl-induced vasoconstriction, the maximum dilating effect being (105. 0±3. 2)% and (78. 0±6. 5)% , respectively; L-NAME affected the vasodilatory effect of EJs on thoracic aorta rings ( P<0. 01), the maximum dilatory effect being (58. 0 ± 6. 9)% . BaCl2 and Gli had significant influence on vasodilation of EJs, and the contraction was obviously attenuated (P<0. 01), the maximum dilatory effect being (37. 0±5. 2)% and (78. 0±10. 0)% , respectively. EJs significantly inhibited contracting effect of PE on thoracic aorta rings in Ca2+-free medium (P<0. 01). The maximum contraction effect was (70. 0±6. 3)% . EJs inhibited CaCl2-induced vasoconstriction (0. 5-8 mmol·L-1 ), and vasoconstriction was decreased by (65. 0±3. 2)% . LSCM recorded that Fmax / F0 of 4 and 8 g·L-1 EJs was (2. 0±0. 2) and (1. 5±0. 2), respectively. Conclusion EJs exerted a dose-dependent vasodilating effect on rat isolated aorta rings. The mechanism might be related to promoting NO release, activating K+channels and decreasing the concentration of cytoplasmic Ca2+.
Objective To observe the vasodilation effect of extract of Jasminum samba (EJs), a kind of traditional Chinese medicine, on ex vivo rat thoracic aortic rings, and to investigate its mechanism. Methods On ex vivo aortic ring perfusion device, influence of EJs on contraction of the aorta induced by phenylephrine (PE) or potassium chloride (KCl) was observed. Influence of N-nitro-L-arginine-methylester ( L-NAME ), barium chloride ( BaCl2 ), glibenclamide ( Gli ) on vasodilating effect of EJs (0. 5, 1, 2, 4, 8 g·L-1 ) was detected. Effect of EJs on the contraction of calcium chloride (CaCl2 ) and PE in Ca2+-free medium was detected. [ Ca2+ ] i in vascular smooth muscle cells was determined by using laser scanning confocal microscope (LSCM). Results In blood vessels with intact endothelium, EJs concentration-dependently decreased PE- or KCl-induced vasoconstriction, the maximum dilating effect being (105. 0±3. 2)% and (78. 0±6. 5)% , respectively; L-NAME affected the vasodilatory effect of EJs on thoracic aorta rings ( P<0. 01), the maximum dilatory effect being (58. 0 ± 6. 9)% . BaCl2 and Gli had significant influence on vasodilation of EJs, and the contraction was obviously attenuated (P<0. 01), the maximum dilatory effect being (37. 0±5. 2)% and (78. 0±10. 0)% , respectively. EJs significantly inhibited contracting effect of PE on thoracic aorta rings in Ca2+-free medium (P<0. 01). The maximum contraction effect was (70. 0±6. 3)% . EJs inhibited CaCl2-induced vasoconstriction (0. 5-8 mmol·L-1 ), and vasoconstriction was decreased by (65. 0±3. 2)% . LSCM recorded that Fmax / F0 of 4 and 8 g·L-1 EJs was (2. 0±0. 2) and (1. 5±0. 2), respectively. Conclusion EJs exerted a dose-dependent vasodilating effect on rat isolated aorta rings. The mechanism might be related to promoting NO release, activating K+channels and decreasing the concentration of cytoplasmic Ca2+.