小檗碱对大鼠再灌心律失常及钙调节的作用

小檗碱（Ｂｅｒ，１０ｍｇ·ｋｇ－１）使缺血／再灌后ＶＴ发生率明显降低，持续时间明显缩短，无１例发生ＶＦ及死亡，与对照组比较差异有显著性。离体实验表明：小檗碱（３０μｍｏｌ·Ｌ－１），能抑制高钙条件下Ｃａ２＋内流，而增加低钙条件下的Ｃａ２＋内流。结果表明：小檗碱具有预防再灌心律失常作用；不同Ｃａ２＋浓度能够影响心肌４５Ｃａ内流；小檗碱对心肌Ｃａ２＋内流有双向调节作用，尤其在高Ｃａ２＋条件下，降低４５Ｃａ内流可能是其抗心律失常作用机制之一。

甲状旁腺素和降钙素对痛觉的中枢调节作用及其机理探讨

本文观察了脑室内注射甲状旁腺素(PTH)和降钙素(CT)对小鼠痛阈及对脑突触小体^(45)Ca摄取的彩响。结果表明,PTH(0.1U、0.4U、0.8U)均使小鼠痛阈明显降低,与此相反,CT(0.5U、1.0U、2.0U)则使小鼠痛阈显著上升,并有很好的量效关系。另外,PTH(0.5U、1.0U)明显促进脑突触小体对^(45)Ca的摄取,CT(1.0U、2.0U)则明显抑制^(45)Ca的摄取。结果提示,这两种激素可能通过影响中枢神经细胞Ca^(2+)的摄取,参与中枢的痛觉调节机制。

Calcium antagonistic effects of Bambusa Rigida investigated by ^(45)Ca and its protection on myocardial ischemia of rats

An investigation was conducted using ^(45)Ca as a radioactive tracer to evaluate calcium antagonistic effects of several extracts from Bambusa Rigida in living rats.The relationship between the flavonoid and saccharide contents of Bambusa Rigida and calcium antagonistic effects were also analyzed.The protective effects of the alkali extracts of Bambusa Rigida on myocardial ischemia were investigated in living rats.The results indicated that the alkali extracts of Bambusa Rigida had a prominent influence on Ca^(2+) influx and efflux in the isolated rat aorta and heart,as they could obviously block ^(45)Ca entering into cells and stimulate efflux of intracellular Ca^(2+).Moreover,the alkali extracts of Bambusa Rigida had favorable protective effects on myocardial ischemia induced either by isoproterenoi injection (ISO) or by the ligation of coronary artery.These results implied that the Bambusa Rigida had attractive potential for the treatment of heart,cerebrovascular and other diseases.However,the conclusion that whether the flavonoid or saccharide in Bambusa Rigida affected the calcium antagonistic effects and Ca^(2+) channels or not was hard to make within the results of the investigation.