目的:探讨皱皮木瓜总黄酮(FLC)松弛胃肠平滑肌作用机制及其与Ca^(2+)的关系.方法:采用家兔离体空肠、回肠和结肠带生物测定法,在离体标本灌流槽中以Tyrode's液平衡家兔空肠、回肠和结肠带,分别观察FLC对空肠自律性收缩、对Ach诱导...目的:探讨皱皮木瓜总黄酮(FLC)松弛胃肠平滑肌作用机制及其与Ca^(2+)的关系.方法:采用家兔离体空肠、回肠和结肠带生物测定法,在离体标本灌流槽中以Tyrode's液平衡家兔空肠、回肠和结肠带,分别观察FLC对空肠自律性收缩、对Ach诱导空肠收缩、对高钾所致结肠带收缩、以及CaCl2诱导回肠平滑肌收缩的影响.结果:FLC和Ver对高K^+去极化所致结肠带收缩呈剂量依赖性松弛作用,压低最大效应(Emax);FLC(8g/L)对空肠自律性收缩(频率:5.83±2.64 vs 12.52±0.41,P<0.01;张力:0.76±0.26 g vs 2.13±0.21g,P<0.01)和Ach诱导的收缩反应(频率:7.00±2.44 vs 13.10±0.90,P<0.01;张力:0.87±0.34 g vs 3.47±0.57g,P<0.01)均具抑制作用;FLC剂量依赖性抑制Ca^(2+)诱导回肠收缩作用,4、8 g/L时收缩幅度显著低于对照组(2.53±0.45,1.35±0.57 mm vs 5.41±0.64mm,P<0.01).结论:FLC抑制胃肠平滑肌的功能与阻断电压依赖性的钙通道有关.展开更多
In this study, the target bioactive compounds （e.g., alkaloids, flavonoids, saponins and other polar compounds） in Vietnamese Caricapapaya leaves were extracted. The cytotoxic activities of the papaya leaves extract...In this study, the target bioactive compounds （e.g., alkaloids, flavonoids, saponins and other polar compounds） in Vietnamese Caricapapaya leaves were extracted. The cytotoxic activities of the papaya leaves extracts on the selected tumor cell lines, such as lung cancer cell line LU-1, carcinoma cell line KB, breast cancer cells MCF7 and leukemia cell line HL-60, were examined. Preliminary findings showed a high inhibitive activity of papaya leave extracts against the four tested tumor cell lines at the concentration of 100 μg/mL. Out of the bioactive compounds in papaya leaves extract, alkaloids showed the highest inhibitive activity （105.95% on MCF7 and 91.86% on LU-1）, followed by polar compounds （62.88% on LU-1 and 21.80% on KB）, and saponins （59.74% on MCF7 and 25.25% on LU-1）. Flavonoids has the lowest inhibitive activity on cell lines （e.g., 45.51% on MCF7 and 20.32% on LU-1）. Taken together, the results suggest that alkaloids have a relatively high inhibitive activity on the selected tumor cell lines and their stimulated concentration at 50% （IC50） values for on MCF7 and KB were 24.67 μg/mL and 33.56 μg/mL, respectively. However, the result pointed out the immunostimulatory ability of only polar compounds and saponins which could stimulate the growth of in vitro lymphocytes but not flavonoids and alkaloids. The SC50 （stimulated concentration at 50%） values of polar compounds and saponins were 287.87μg/mL and 192.99 μg/mL, respectively.展开更多
文摘目的:探讨皱皮木瓜总黄酮(FLC)松弛胃肠平滑肌作用机制及其与Ca^(2+)的关系.方法:采用家兔离体空肠、回肠和结肠带生物测定法,在离体标本灌流槽中以Tyrode's液平衡家兔空肠、回肠和结肠带,分别观察FLC对空肠自律性收缩、对Ach诱导空肠收缩、对高钾所致结肠带收缩、以及CaCl2诱导回肠平滑肌收缩的影响.结果:FLC和Ver对高K^+去极化所致结肠带收缩呈剂量依赖性松弛作用,压低最大效应(Emax);FLC(8g/L)对空肠自律性收缩(频率:5.83±2.64 vs 12.52±0.41,P<0.01;张力:0.76±0.26 g vs 2.13±0.21g,P<0.01)和Ach诱导的收缩反应(频率:7.00±2.44 vs 13.10±0.90,P<0.01;张力:0.87±0.34 g vs 3.47±0.57g,P<0.01)均具抑制作用;FLC剂量依赖性抑制Ca^(2+)诱导回肠收缩作用,4、8 g/L时收缩幅度显著低于对照组(2.53±0.45,1.35±0.57 mm vs 5.41±0.64mm,P<0.01).结论:FLC抑制胃肠平滑肌的功能与阻断电压依赖性的钙通道有关.
文摘In this study, the target bioactive compounds （e.g., alkaloids, flavonoids, saponins and other polar compounds） in Vietnamese Caricapapaya leaves were extracted. The cytotoxic activities of the papaya leaves extracts on the selected tumor cell lines, such as lung cancer cell line LU-1, carcinoma cell line KB, breast cancer cells MCF7 and leukemia cell line HL-60, were examined. Preliminary findings showed a high inhibitive activity of papaya leave extracts against the four tested tumor cell lines at the concentration of 100 μg/mL. Out of the bioactive compounds in papaya leaves extract, alkaloids showed the highest inhibitive activity （105.95% on MCF7 and 91.86% on LU-1）, followed by polar compounds （62.88% on LU-1 and 21.80% on KB）, and saponins （59.74% on MCF7 and 25.25% on LU-1）. Flavonoids has the lowest inhibitive activity on cell lines （e.g., 45.51% on MCF7 and 20.32% on LU-1）. Taken together, the results suggest that alkaloids have a relatively high inhibitive activity on the selected tumor cell lines and their stimulated concentration at 50% （IC50） values for on MCF7 and KB were 24.67 μg/mL and 33.56 μg/mL, respectively. However, the result pointed out the immunostimulatory ability of only polar compounds and saponins which could stimulate the growth of in vitro lymphocytes but not flavonoids and alkaloids. The SC50 （stimulated concentration at 50%） values of polar compounds and saponins were 287.87μg/mL and 192.99 μg/mL, respectively.
