Mangiferin relieves Staphylococcus aureus-induced pneumonia by inhibiting the NF-κB signalling pathway
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摘要:
目的 探究芒果苷对金黄色葡萄球菌诱导的肺炎的影响及对NF-κB信号通路的作用。 方法 将50只Balb/c雄性小鼠采用随机数字法分为5组,每组10只:分别为对照组、金黄色葡萄球菌组、芒果苷(15、30、60 mg/kg)组。金黄色葡萄球菌诱导造模1 h后,芒果苷组给予腹腔注射芒果苷。12 h后,收集各组肺泡灌洗液、小鼠肺组织。测定各组肺泡灌洗液TNF-α和IL-1β水平,各组肺组织湿干比(W/D)和肺髓过氧化物酶(MPO)活性,肺组织p65水平。 结果 相比于模型组,低、中、高剂量芒果苷能有效降低TNF-α、IL-1β、W/D、MPO水平(均P < 0.05),并呈计量依赖性。高剂量组TNF-α、IL-1β、W/D、MPO分别为(3.25±0.52)ng/mL、(3.53±0.65)ng/mL、7.16±0.34、(3.15±0.61)U/g,显著低于模型组的(5.28±0.93)ng/mL、(6.63±0.85)ng/mL、10.55±0.92、(6.74±0.85)U/g(t=6.025,P < 0.001;t=9.161,P < 0.001;t=10.930,P < 0.001;t=10.850,P < 0.001)。机理研究显示芒果苷可有效下调金黄色葡萄球菌诱导的p-p65。 结论 芒果苷可通过抑制NF-κB信号通路改善金黄色葡萄球菌诱导的小鼠肺炎。 Abstract:Objective This study aimed to investigate the effect of mangiferin on Staphylococcus aureus-induced pneumonia and on the NF-κB signalling pathway. Methods Fifty Balb/c male mice were randomly divided into five groups by the random number method, with 10 mice in each group: control group, S. aureus group and mangiferin (15, 30 and 60 mg/kg) group. After 1 h of S. aureus-induced modelling, the mangiferin group was given intraperitoneal injection of mangiferin. After 12 h, the alveolar lavage fluid and lung tissues of each group were collected. The TNF-α and IL-1β levels of alveolar lavage fluid, wet-to-dry ratio (W/D), activity of pulmonary myeloperoxidase (MPO) and the p65 level of lung tissue were measured. Results Compared with the model group, low, middle and high dose of mangiferin could effectively reduce TNF-α, IL-1β, W/D and MPO in a quantitative manner (all P < 0.05). The TNF-α, IL-1β, W/D and MPO of the high-dose mangiferin group were (3.25±0.52) ng/mL, (3.53±0.65) ng/mL, 7.16±0.34 and (3.15±0.61) U/g, respectively, which were significantly lower than those of the model group[(5.28±0.93) ng/mL, (6.63±0.85) ng/mL, 10.55±0.92, (6.74±0.85) U/g, t=6.025, P < 0.001; t=9.161, P < 0.001; t=10.930, P < 0.001; t=10.850, P < 0.001]. Mechanism research showed that mangiferin could effectively down-regulate p-p65 induced by S. aureus. Conclusion Mangiferin could improve S. aureus-induced pneumonia in mice by inhibiting the NF-κB signalling pathway. -
Key words:
- Mangiferin /
- Pneumonia /
- Staphylococcus aureus /
- Pulmonary myeloperoxidase /
- Nuclear factor-κB
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表 1 各组小鼠TNF-α和IL-1β比较(x ±s, ng/mL)
组别 只数 TNF-α 1L-1β 对照组 10 0.22±0.07a 0.12±0.03a 模型组 10 5.28±0.93 6.63±0.85 芒果苷低剂量 10 4.10±0.87ab 5.12±0.93ab 芒果苷中剂量 10 3.81±0.72ab 4.13±0.72ab 芒果苷高剂量 10 3.25±0.52ab 3.53±0.65ab F值 74.020 115.700 P值 < 0.001 < 0.001 注:与模型组比较,aP < 0.05;与对照组比较,bP < 0.05。 表 2 各组小鼠W/D比较(x ±s)
组别 只数 W/D 对照组 10 5.51±0.54a 模型组 10 10.55±0.92 芒果苷低剂量 10 8.72±0.83ab 芒果苷中剂量 10 7.53±0.72ab 芒果苷高剂量 10 7.16±0.34ab F值 71.580 P值 < 0.001 注:与模型组比较,aP < 0.05;与对照组比较,bP < 0.05。 表 3 各组小鼠MPO比较(x ±s, U/g)
组别 只数 MPO 对照组 10 0.32±0.05a 模型组 10 6.74±0.85 芒果苷低剂量 10 5.33±0.93ab 芒果苷中剂量 10 3.74±0.52ab 芒果苷高剂量 10 3.15±0.61ab F值 132.300 P值 < 0.001 注:与模型组比较,aP < 0.05;与对照组比较,bP < 0.05。 -
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