Sebola Tendani E, Uche-Okereafor Nkemdinma C, Mekuto Lukhanyo, Makatini Maya Mellisa, Green Ezekiel, Mavumengwana Vuyo
Department of Biotechnology and Food Technology, Faculty of Science, University of Johannesburg, Doornfontein Campus, Johannesburg, South Africa.
Department of Chemical Engineering, Faculty of Engineering and the Built Environment, University of Johannesburg, Doornfontein Campus, Johannesburg, South Africa.
Int J Microbiol. 2020 Dec 10;2020:8839490. doi: 10.1155/2020/8839490. eCollection 2020.
This study isolated and identified endophytic bacteria from the leaves of and investigated the potential of the bacterial endophyte extracts as antibacterial and anticancer agents and their subsequent secondary metabolites. Ethyl acetate extracts from the endophytes and the leaves (methanol: dichloromethane (1 : 1)) were used for antibacterial activity against selected pathogenic bacterial strains by using the broth microdilution method. The anticancer activity against the U87MG glioblastoma and A549 lung carcinoma cells was determined by the MTS (3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxy-phenyl)-2-(4-sulfophenyl)-2H-tetrazolium) assay. Bacterial endophytes that were successfully isolated from leaves include , , sp., , , , , , and . exhibited broad antibacterial activity against both Gram-negative and Gram-positive pathogenic bacteria while displayed the least MIC of 0.0625 mg/mL. crude extracts were the only sample that showed notable cell reduction of 50% against A549 lung carcinoma cells at a concentration of 100 g/mL. Metabolite profiling of , , and crude extracts revealed the presence of known antibacterial and/or anticancer agents such as lycorine (1), angustine (2), crinamidine (3), vasicinol (4), and powelline. It can be concluded that the crude bacterial endophyte extracts obtained from leaves can biosynthesize bioactive compounds and can be bioprospected for medical application into antibacterial and anticancer agents.
本研究从[植物名称]叶片中分离并鉴定了内生细菌,并研究了细菌内生菌提取物作为抗菌和抗癌剂及其后续次生代谢产物的潜力。通过肉汤微量稀释法,使用内生菌和叶片(甲醇:二氯甲烷(1∶1))的乙酸乙酯提取物对选定的致病细菌菌株进行抗菌活性测试。通过MTS(3-(4,5-二甲基噻唑-2-基)-5-(3-羧甲氧基苯基)-2-(4-磺基苯基)-2H-四唑)分析法测定对U87MG胶质母细胞瘤和A549肺癌细胞的抗癌活性。从[植物名称]叶片中成功分离出的细菌内生菌包括[细菌名称1]、[细菌名称2]、[细菌名称3]菌属、[细菌名称4]、[细菌名称5]、[细菌名称6]、[细菌名称7]、[细菌名称8]、[细菌名称9]。[细菌名称1]对革兰氏阴性和革兰氏阳性致病细菌均表现出广泛的抗菌活性,而[细菌名称2]的最低抑菌浓度(MIC)为0.0625 mg/mL,是最低的。[细菌名称3]粗提物是唯一在浓度为100 μg/mL时对A549肺癌细胞显示出显著50%细胞减少的样品。[细菌名称1]、[细菌名称2]和[细菌名称3]粗提物的代谢产物谱分析显示存在已知的抗菌和/或抗癌剂,如石蒜碱(1)、安格因(2)、克林米定(3)、瓦西西诺(4)和鲍威林。可以得出结论,从[植物名称]叶片中获得粗细菌内生菌提取物可以生物合成生物活性化合物,并可作为抗菌和抗癌剂进行医学应用的生物勘探。