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Effects of Ursolic Acid on Contractile Activity of Gastric Smooth Muscles

机译:熊果酸对胃平滑肌收缩活性的影响

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Ursolic acid (UA) in concentrations of 1x10(-7) mol/L - 5x10(-5) mol/L induced relaxation in gastric smooth muscle (SM) tissues, in a concentration-dependent manner. The relaxation did not change membrane potential and slow wave contraction patterns. A significant decrease in amplitude and frequency of spike-potentials was observed. UA-induced reactivity was removed when SM preparations were treated with nifedipine (1x10(-6) mol/L). Ca2+-induced contractions of the depolarized SM preparations (42 mmol/L K+; Ca2+-free Krebs solution) were substantially reduced in the presence of UA. It was determined that, in certain concentrations, UA influenced L - type Ca2+ channels, and reduced the Ca2+ influx.
机译:浓度为1x10(-7)mol / L-5x10(-5)mol / L的熊果酸(UA)引起胃平滑肌(SM)组织中的松弛,其浓度依赖性。松弛并没有改变膜电位和慢波收缩模式。观察到尖峰电位的幅度和频率显着下降。当SM制剂用硝苯地平(1x10(-6)mol / L)处理时,UA诱导的反应性被消除。在UA存在下,Ca2 +引起的去极化SM制剂(42 mmol / L K +;不含Ca2 +的克雷布斯溶液)的收缩显着降低。已确定,在一定浓度下,UA影响了L-型Ca2 +通道,并减少了Ca2 +的流入。

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