目的探讨三叶青乙酸乙酯提取物对小鼠Lewis肺癌移植瘤的抑瘤效应及其作用机制。方法采用动物移植性肿瘤实验法腋下接种Lewis肺癌细胞制备小鼠荷瘤模型。观察三叶青乙酸乙酯提取物对瘤重、抑瘤率的影响;并用TUNEL法检测肿瘤细胞凋亡,免...目的探讨三叶青乙酸乙酯提取物对小鼠Lewis肺癌移植瘤的抑瘤效应及其作用机制。方法采用动物移植性肿瘤实验法腋下接种Lewis肺癌细胞制备小鼠荷瘤模型。观察三叶青乙酸乙酯提取物对瘤重、抑瘤率的影响;并用TUNEL法检测肿瘤细胞凋亡,免疫组化法和real time RT-PCR法检测瘤组织中Bcl-2、Bax、caspase-3的表达。结果三叶青各剂量组抑瘤率和肿瘤细胞凋亡率均高于模型对照组(P<0.05或P<0.01),其效应呈浓度依赖性;各剂量组Bcl-2的蛋白和mRNA表达下降(P<0.05或P<0.01)、Bax的蛋白和mRNA表达上升(P<0.05或P<0.01)、高剂量组caspase-3的蛋白表达上升(P<0.05)。结论中药三叶青乙酸乙酯提取物能抑制小鼠Lewis肺癌细胞的生长,可能与其促进肿瘤细胞坏死及下调Bcl-2、上调Bax和caspase-3从而促进肿瘤细胞凋亡有关。展开更多
The present study investigated the chemical composition of ethylacetate extracts from an endophytic actinomycete Streptomyces sp. A0916 and its host Polygonum cuspidatum. A comparative analysis of the antimicrobial an...The present study investigated the chemical composition of ethylacetate extracts from an endophytic actinomycete Streptomyces sp. A0916 and its host Polygonum cuspidatum. A comparative analysis of the antimicrobial and antioxidant properties of the extracts was also conducted. 32 compounds of P. cuspidatum and 23 compounds of Streptomyces sp. A0916 were isolated and identified by GC/MS. Antimicrobial activities of the extracts were evaluated using eight microbial strains(3 Gram-positive bacteria, 3 Gram-negative bacteria, and 2 fungi). The Streptomyces sp. A0916 extracts showed a wide range of antimicrobial activities and presented greater antimicrobial effectiveness than the P. cuspidatum extracts. The minimum inhibitory concentration(MIC) of Streptomyces sp. A0916 extracts against the ampicillin-resistant strain Enterococcus faecium SIIA843 was 32 μg·m L-1. Furthermore, the extracts had greater antimicrobial effect against Gram-positive bacteria than Gram-negative bacteria. Finally, the antioxidant activity of the Streptomyces sp. A0916 extracts was equal to that of the P. cuspidatum extracts. In conclusion, our results suggest that the endophytic actinomycetes of the medicinal plants are an important source of bioactive substances.展开更多
AIM:Ethylacetate extract of Alpinia purpurata was evaluated for its potential in vitro antioxidant and antican-cer activity.METHODS:The antioxidant activity was evaluated by 1,1-diphenyl-2-picrylhydrazyl(DPPH) free ra...AIM:Ethylacetate extract of Alpinia purpurata was evaluated for its potential in vitro antioxidant and antican-cer activity.METHODS:The antioxidant activity was evaluated by 1,1-diphenyl-2-picrylhydrazyl(DPPH) free radical scav-enging method,hydroxyl radical activity,superoxide radical scavenging activity,nitric oxide radical scavenging activity,hy-drogen peroxide radical scavenging activity and reducing power activity.The viability of OAW42 cells was evaluated by MTT assay.RESULTS:A.purpurata exhibited potential antioxidant activity with a concentration-dependent manner.The extract showed potential anticancer activity at the 48th hour with IC50 of 130.20 μg·mL·1 and exhibited a dose-dependent decrease in cell count for all the concentrations tested.CONCLUSION:The results suggested that long term consumption of A.purpurata exhibited antioxidant and anticancer activity and could be further exploited for their anticancer properties.展开更多
文摘目的探讨三叶青乙酸乙酯提取物对小鼠Lewis肺癌移植瘤的抑瘤效应及其作用机制。方法采用动物移植性肿瘤实验法腋下接种Lewis肺癌细胞制备小鼠荷瘤模型。观察三叶青乙酸乙酯提取物对瘤重、抑瘤率的影响;并用TUNEL法检测肿瘤细胞凋亡,免疫组化法和real time RT-PCR法检测瘤组织中Bcl-2、Bax、caspase-3的表达。结果三叶青各剂量组抑瘤率和肿瘤细胞凋亡率均高于模型对照组(P<0.05或P<0.01),其效应呈浓度依赖性;各剂量组Bcl-2的蛋白和mRNA表达下降(P<0.05或P<0.01)、Bax的蛋白和mRNA表达上升(P<0.05或P<0.01)、高剂量组caspase-3的蛋白表达上升(P<0.05)。结论中药三叶青乙酸乙酯提取物能抑制小鼠Lewis肺癌细胞的生长,可能与其促进肿瘤细胞坏死及下调Bcl-2、上调Bax和caspase-3从而促进肿瘤细胞凋亡有关。
基金supported by Department of Science and Technology of Sichuan Province,China(No.2014 JY0199)
文摘The present study investigated the chemical composition of ethylacetate extracts from an endophytic actinomycete Streptomyces sp. A0916 and its host Polygonum cuspidatum. A comparative analysis of the antimicrobial and antioxidant properties of the extracts was also conducted. 32 compounds of P. cuspidatum and 23 compounds of Streptomyces sp. A0916 were isolated and identified by GC/MS. Antimicrobial activities of the extracts were evaluated using eight microbial strains(3 Gram-positive bacteria, 3 Gram-negative bacteria, and 2 fungi). The Streptomyces sp. A0916 extracts showed a wide range of antimicrobial activities and presented greater antimicrobial effectiveness than the P. cuspidatum extracts. The minimum inhibitory concentration(MIC) of Streptomyces sp. A0916 extracts against the ampicillin-resistant strain Enterococcus faecium SIIA843 was 32 μg·m L-1. Furthermore, the extracts had greater antimicrobial effect against Gram-positive bacteria than Gram-negative bacteria. Finally, the antioxidant activity of the Streptomyces sp. A0916 extracts was equal to that of the P. cuspidatum extracts. In conclusion, our results suggest that the endophytic actinomycetes of the medicinal plants are an important source of bioactive substances.
文摘AIM:Ethylacetate extract of Alpinia purpurata was evaluated for its potential in vitro antioxidant and antican-cer activity.METHODS:The antioxidant activity was evaluated by 1,1-diphenyl-2-picrylhydrazyl(DPPH) free radical scav-enging method,hydroxyl radical activity,superoxide radical scavenging activity,nitric oxide radical scavenging activity,hy-drogen peroxide radical scavenging activity and reducing power activity.The viability of OAW42 cells was evaluated by MTT assay.RESULTS:A.purpurata exhibited potential antioxidant activity with a concentration-dependent manner.The extract showed potential anticancer activity at the 48th hour with IC50 of 130.20 μg·mL·1 and exhibited a dose-dependent decrease in cell count for all the concentrations tested.CONCLUSION:The results suggested that long term consumption of A.purpurata exhibited antioxidant and anticancer activity and could be further exploited for their anticancer properties.
