Xenorhabdus bacterium has been used as a biological control agent against Luciaphorus sp., a mushroom mite endemic in Thailand. To develop an effective formulation ofXenorhabdus stokiae, treatments using different par...Xenorhabdus bacterium has been used as a biological control agent against Luciaphorus sp., a mushroom mite endemic in Thailand. To develop an effective formulation ofXenorhabdus stokiae, treatments using different parts of X. stokiae isolate PB09 culture, including whole cell suspension, cell-free supernatant, and crude cell extract, were performed. The results show that different parts ofX. stokiae isolate PB09 culture could induce variable effects on mite mortality and fecundity. Application with cell-free supernatant of X. stokiae culture resulted in both the highest mite mortality rate [（89.00＋3.60）%] and the lowest mite fecundity [（41.33_＋23.69） eggs/gravid female]. Whole cell suspen- sion of X. stokiae isolate PB09 culture was found to be slightly less effective than its cell-free supernatant, suggesting that X. stokiae was more likely to release its metabolites with acaricidal activities to the surrounding culture media. Crude cell extract of X. stokiae was not effective against mites. Cell-free supematant of X. stokiae isolate PB09 was the most effective biological control agent and it could be conveniently used in future formulations instead of live bacteria.展开更多
目的:比较葛根素(standard of purepuerarin,SP)和葛根粗提物(pueraria crude extract,CP)对小细胞肺癌H446生长的影响.方法:运用MTT法、流式细胞术、细胞免疫化学方法观察SP和CP对H446细胞生长、凋亡、细胞周期分布以及对PCNA基因表达...目的:比较葛根素(standard of purepuerarin,SP)和葛根粗提物(pueraria crude extract,CP)对小细胞肺癌H446生长的影响.方法:运用MTT法、流式细胞术、细胞免疫化学方法观察SP和CP对H446细胞生长、凋亡、细胞周期分布以及对PCNA基因表达的影响.结果:CP组和SP组细胞凋亡率分别为14.71%和2.61%,差异具有统计学意义(P<0.05);G0/G1期细胞构成比分别为79.20%和72.20%,G2/M期细胞构成比分别为8.94%和10.50%,与对照组相比,差异均具有统计学意义(P<0.05);CP作用于H446细胞后,PCNA蛋白表达量减少,与对照组相比,差异有统计学意义(P<0.05).结论:CP和SP均可抑制H446细胞增殖,且CP强于SP;SP和CP可诱导细胞凋亡,其机制可能与其导致细胞G0/G1期阻滞、PCNA表达下调有关.展开更多
基金Project (No. RTA 4880006)supported by the Thailand Research Fund,Kasetsart University and Mahasarakham University
文摘Xenorhabdus bacterium has been used as a biological control agent against Luciaphorus sp., a mushroom mite endemic in Thailand. To develop an effective formulation ofXenorhabdus stokiae, treatments using different parts of X. stokiae isolate PB09 culture, including whole cell suspension, cell-free supernatant, and crude cell extract, were performed. The results show that different parts ofX. stokiae isolate PB09 culture could induce variable effects on mite mortality and fecundity. Application with cell-free supernatant of X. stokiae culture resulted in both the highest mite mortality rate [（89.00＋3.60）%] and the lowest mite fecundity [（41.33_＋23.69） eggs/gravid female]. Whole cell suspen- sion of X. stokiae isolate PB09 culture was found to be slightly less effective than its cell-free supernatant, suggesting that X. stokiae was more likely to release its metabolites with acaricidal activities to the surrounding culture media. Crude cell extract of X. stokiae was not effective against mites. Cell-free supematant of X. stokiae isolate PB09 was the most effective biological control agent and it could be conveniently used in future formulations instead of live bacteria.
文摘目的:比较葛根素(standard of purepuerarin,SP)和葛根粗提物(pueraria crude extract,CP)对小细胞肺癌H446生长的影响.方法:运用MTT法、流式细胞术、细胞免疫化学方法观察SP和CP对H446细胞生长、凋亡、细胞周期分布以及对PCNA基因表达的影响.结果:CP组和SP组细胞凋亡率分别为14.71%和2.61%,差异具有统计学意义(P<0.05);G0/G1期细胞构成比分别为79.20%和72.20%,G2/M期细胞构成比分别为8.94%和10.50%,与对照组相比,差异均具有统计学意义(P<0.05);CP作用于H446细胞后,PCNA蛋白表达量减少,与对照组相比,差异有统计学意义(P<0.05).结论:CP和SP均可抑制H446细胞增殖,且CP强于SP;SP和CP可诱导细胞凋亡,其机制可能与其导致细胞G0/G1期阻滞、PCNA表达下调有关.
