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从 茎中获得的 种的粗次生代谢产物提取物的抗菌活性及其对两种癌细胞系的影响。

Antibacterial Activities of Crude Secondary Metabolite Extracts from Species Obtained from the Stem of and Their Effects on Two Cancer Cell Lines.

机构信息

Department of Biotechnology and Food Technology, Faculty of Science, University of Johannesburg, PO Box 17011, Doornfontein, Johannesburg 2028, South Africa.

Department of Chemical Engineering, Faculty of Engineering and the Built Environment, University of Johannesburg, PO Box 17011, Doornfontein, Johannesburg 2028, South Africa.

出版信息

Int J Environ Res Public Health. 2019 Feb 19;16(4):602. doi: 10.3390/ijerph16040602.

Abstract

Endophytes are microorganisms that are perceived as non-pathogenic symbionts found inside plants since they cause no symptoms of disease on the host plant. Soil conditions and geography among other factors contribute to the type(s) of endophytes isolated from plants. Our research interest is the antibacterial activity of secondary metabolite crude extracts from the medicinal plant and its bacterial endophytes. Fresh, healthy stems of were collected, washed, surface sterilized, macerated in PBS, inoculated in the nutrient agar plates, and incubated for 5 days at 30 °C. Amplification and sequencing of the rRNA gene was applied to identify the isolated bacterial endophytes. These endophytes were then grown in nutrient broth for 7⁻14 days, after which sterilized Amberlite XAD7HP 20⁻60 mesh (Merck KGaA, Darmstadt, Germany) resin was added to each culture to adsorb the secondary metabolites, which were later extracted using ethyl acetate. Concentrated crude extracts from each bacterial endophyte were tested for antibacterial activity against 11 pathogenic bacteria and two human cancer cell lines. In this study, a total of three bacterial endophytes of the genus were identified from the stem of . The antibacterial test showed that crude secondary metabolites of the endophytes and stem of possessed antibacterial properties against pathogenic microbes such as and , with concentrations showing inhibition ranging from 0.0625 to 8.0000 mg/mL. The anticancer analysis showed an increase in cell proliferation when A549 lung carcinoma and UMG87 glioblastoma cell lines were treated with both the plant and endophytes' crude extracts. As far as we know, this is the first study of its kind on in South Africa showing endophytes having activity against some of the common human pathogenic organisms.

摘要

内生菌被视为非致病共生体,存在于植物内部,因为它们在宿主植物上不会引起疾病症状。土壤条件和地理等因素影响从植物中分离出的内生菌类型。我们的研究兴趣是药用植物及其细菌内生菌的次生代谢物粗提物的抗菌活性。采集新鲜、健康的 茎,洗净,表面消毒,在 PBS 中捣碎,接种于营养琼脂平板,在 30°C 下孵育 5 天。应用 16S rRNA 基因扩增和测序来鉴定分离的细菌内生菌。然后将这些内生菌在营养肉汤中培养 7-14 天,之后向每个培养物中加入灭菌 Amberlite XAD7HP 20-60 目(默克股份公司,达姆施塔特,德国)树脂以吸附次生代谢物,然后用乙酸乙酯提取。对每种细菌内生菌的浓缩粗提物进行抗菌活性测试,以检测其对 11 种致病菌和两种人癌细胞系的抑制作用。在这项研究中,从 茎中总共鉴定出三种 属的细菌内生菌。抗菌试验表明,内生菌和 茎的次生代谢物粗提物具有抗菌活性,可抑制 和 等致病微生物,浓度范围为 0.0625 至 8.0000mg/mL。抗癌分析表明,当用植物和内生菌的粗提取物处理 A549 肺癌和 UMG87 胶质母细胞瘤细胞系时,细胞增殖增加。据我们所知,这是南非首次对 进行的此类研究,表明 内生菌对一些常见的人类致病生物具有活性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5982/6406648/61d77a736d7a/ijerph-16-00602-g001.jpg

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