PDF
Full
Outline
Objective To study protective effects of total polyphenols from Nymphaea candida (NCTP) on lipopolysaccharide (LPS) induced inflammatory injury in A549 cells. Methods Polyphenol content in NCTP was determined by Folin-Ciocalte method, and its characteristic components were detected by high performance liquid chromatography (HPLC). A549 cells were treated with 1.0 μg/mL LPS for 12 h to induce inflammatory damage model, and cell counting kit-8 (CCK-8) method was used to screen out the optimal intervention concentration of NCTP. The experiment was divided into control group, lipopolysaccharide model group, dexamethasone (DXM 0.039 μg/mL) group, and NCTP (6.0, 15.0, 30.0 μg/mL) groups. The levels of nitric oxide (NO), prostaglandin E2 (PGE2), malondialdehyde (MDA), superoxide dismutase (SOD) and glutathione (GSH) were detected by biochemical method. Enzyme-linked immunosorbent assay (ELISA) was used to detect the expression of interleukin-1β (IL-1β), interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α) in A549 cells. The expression of related proteins [Kelch-like ECH-associating protein 1 (Keap1), nuclear factor erythroid 2-related factor 2 (Nrf2), heme oxygenase-1 (HO-1)] in nuclear factor erythroid-2-related factor 2/heme oxygenase 1 (Nrf2/HO-1) signaling pathway was detected by Western Blot. Results The content of total polyphenols in NCTP was (90.15±0.17)%, and the content of isostrictiniin, ellagic acid and nicotiflorin was (28.05±0.02)%, (2.15±0.03)% and (3.50±0.01)%, respectively. The mass concentrations of NCTP screened by CCK-8 were 6.0, 15.0, 30.0 μg/mL. After LPS stimulation of A549 cells, the expressions of intracellular inflammatory mediators NO, PGE2 and inflammatory factors IL-1β, IL-6 and TNF-α were significantly increased (P<0.01), indicating that the inflammatory damage model of A549 cells was successfully constructed. Compared with the model group, NCTP significantly inhibited the expression of NO, PGE2, IL-1β, IL-6, TNF-α and MDA and increased the activities of SOD and GSH in LPS-induced A549 cells. Compared with the model group, NCTP also significantly increased the expression of Nrf2 and HO-1 proteins in the damaged cells, and decreased the expression level of Keap1 proteins. Conclusion NCTP has the better protective effect on LPS-induced inflammatory injury in A549 cells, and its mechanism is relative to the regulation of the Nrf2/HO-1 signal pathway. The results of this study can provide a basis for the research and development of functional foods with this effective part to prevent respiratory diseases.
PDF
289
134
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
