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投稿时间:2024-01-18
投稿时间:2024-01-18
中文摘要: 以芒果核多酚提取物和鞣花酸为原料,建立脂多糖(lipopolysaccharide,LPS)诱导RAW264.7 体外炎症模型,从分子水平探究芒果核多酚提取物(polyphenol extract,PO)及鞣花酸(ellagic acid,EA)抑制核因子激活的B 细胞的κ-轻链增强(nuclear factor-κB, NF-κB)信号通路的抗炎作用。采用噻唑蓝[3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide,MTT]法检测PO 和EA 对小鼠腹腔巨噬细胞活力的影响,采用酶联免疫吸附试验(enzyme-linked immunosorbent assay,ELISA)法和实时荧光定量聚合酶链式反应(quantitative real-time polymerase chain reaction,realtime qPCR)法分析LPS 诱导的小鼠腹腔巨噬细胞炎症因子及炎症介质肿瘤坏死因子-α(tumor necrosisf actor-α,TNF-α)、白细胞介素-1β(interleukin-1β,IL-1β)、白细胞介素-6(interleukin 6,IL-6)、白细胞介素-10(interleukin 10,IL-10)、环氧化酶-2(cyclooxygenase-2,COX-2)等的分泌及mRNA 表达水平的影响。结果显示:芒果核多酚提取物(PO)和鞣花酸(EA)分别在12.5~100.0 μg/mL 和1.25~20.00 μg/mL 对 LPS 诱导的 RAW264.7 细胞存活率均有显著的抑制作用,且TNF-α、IL-6、IL-10、IL-1β、COX-2 的分泌明显受到PO、EA 的抑制,随着PO 和EA 的浓度增加,抑制效果明显。从分子水平探究PO 及EA 抑制NF-κB 信号通路的抗炎作用发现,经过LPS 刺激后,PO 和EA 均可显著降低细胞上清液中上述炎性因子的mRNA 表达。PO 和EA 对大肠杆菌、金黄色葡萄球菌均有较好抑制作用,最小抑菌浓度分别为1.56 mg/mL 和0.78 mg/mL。
Abstract:The anti-inflammatory effects of the polyphenol extract (PO) and ellagic acid (EA) from mango seeds on the nuclear factor-κB(NF-κB) signaling pathway were studied with a RAW264.7 cell model of inflammation induced by lipopolysaccharide (LPS). The methyl thiazolyl tetrazolium (MTT) assay was employed to measure the cell viability. The enzyme-linked immunosorbent assay and real-time qPCR were employed to determine the secretion and mRNA levels, respectively, of tumor necrosis factor (TNF)-α, interleukin (IL)-1β, IL-6, IL-10, and cyclooxygenase-2 (COX-2). The results showed that PO at 12.5-100.0 μg/mL and EA at 1.25-20.00 μg/mL reduced the survival rate of RAW264.7 cells treated with LPS. PO and EA inhibited the secretion of TNF-α, IL-6, IL-10, IL-1β, and COX-2 in a concentration-dependent manner. Furthermore, PO and EA significantly down-regulated the mRNA levels of the aforementioned inflammatory cytokines in the supernatant of the cells treated with LPS. Finally, PO and EA had inhibitory effects on Escherichia coli and Staphylococcus aureus, with the minimum inhibitory concentrations(MICs) of 1.56 mg/mL and 0.78 mg/mL,respectively.
文章编号:202507005 中图分类号: 文献标志码:
基金项目:广西自然科学基金项目(2019GXNSFBA245058、2020GXNSFAA297006);广西科技计划项目(桂科AB25069305)
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