鹅不食草心菊内酯对肝星状细胞活化的抑制作用机制研究

目的研究鹅不食草心菊内酯(helenalin)对LX-2人肝星状细胞(HSCs)活化的抑制作用及其机制。方法用白细胞介素-1β(IL-1β)20 ng·mL^-1刺激LX-2细胞建立体外细胞模型,另取未刺激细胞作为正常组。将损伤细胞分为5组:模型组、阳性对照组[LY294002(磷脂酰肌醇3激酶/丝苏氨酸蛋白激酶通路抑制剂)20μmol·L^-1]和高、中、低3个剂量实验组(helenalin:2.0,1.0,0.5μmol·L^-1),均干预24 h。用四甲基偶氮唑盐法检测细胞的增殖抑制率,流式细胞术检测细胞凋亡率,实时荧光定量-PCR法检测微小RNA-21(miR-21)基因的表达,蛋白质印迹法检测α-平滑肌肌动蛋白(α-SMA)、I型胶原和Ⅲ型胶原蛋白的表达(光密度值)。结果Helenalin作用24 h时的IC₅₀为6.98μmol·L^-1,根据细胞的增殖抑制率,选择低于IC₅₀的3个浓度(2.0,1.0,0.5μmol·L^-1)作为后续实验的给药浓度。正常组、模型组和高、中、低3个剂量实验组的miR-21基因相对表达量分别为0.99±0.15,1.71±0.07,1.03±0.04,1.01±0.02和1.19±0.12;正常组、模型组、阳性对照组和高、中、低3个剂量实验组的总凋亡率分别为(1.45±0.33)%,(1.93±0.55)%,(23.33±0.49)%,(19.77±0.65)%,(10.70±0.75)%和(3.01±0.38)%;上述6组的α-SMA蛋白相对表达量分别为0.19±0.02,0.26±0.04,0.15±0.02,0.15±0.02,0.18±0.04和0.20±0.04;上述6组的I型胶原蛋白相对表达量分别为0.15±0.02,0.39±0.05,0.19±0.01,0.24±0.04,0.37±0.04和0.38±0.06;上述6组的Ⅲ型胶原蛋白相对表达量分别为0.07±0.01,0.31±0.04,0.09±0.01,0.05±0.01,0.05±0.01和0.18±0.02。上述指标:模型组与正常组相比,差异均有统计学意义(均P<0.01);3个剂量实验组与模型组相比,差异均有统计学意义(P<0.05,P<0.01)。结论Helenalin抗肝纤维化的作用机制可能与抑制肝星状细胞的增殖活化、诱导细胞凋亡和减少活化细胞内胶原的合成并下调miR-21基因的表达有关。     

Effect of Sea Cucumber Enzymolysis Fermentation Liquid on immunosuppressed mice based on metabonomics北大核心CSCD

Aim To prepare the sea cucumber enzy¬molysis fermentation liquid (SCEFL) by enzymatic hydrolysis of protease and fermentation of probiotics and to investigate the effect of SCEFL on the immunosup-pression induced by cyclophosphamide in mice and to explore its mechanism by metabomic method. Methods The immunosuppressive model was induced by in-traperitoneal injection of cyclophosphamide. C57BL/6J mice were randomly divided into normal group, model group, Levamisole group, SCEFL groups (at low, medium and high doses). The pathological changes of spleen were observed by HE staining. The proportion of CD4+and CD8+T lymphocyte subsets and the pro-portion of CD4 /CD8 T lymphocyte subsets in peripheral blood were detected by flow cytometry. The con¬tents of IL-2 ( interleukin-2 ), IgG ( immunoglobulin G) and IgM (immunoglobulin G) in serum were detected by ELISA. The changes of endogenous metabolites in mouse serum were analyzed by UPLC-Q/TOF-MS metabolomics, and the related metabolic pathways were explored. Results SCEFL could improve the pathological changes of immunosuppressed mice, in¬crease the proportion of CD4 T cells and the proportion of CD4+/CD8+T lymphocyte subsets,and increase the contents of IL-2, IgG and IgM in serum. The immune function of mice was regulated mainly through six related metabolic pathways, including glyc-erophospholipid metabolism, sphingolipid metabolism, linoleic acid metabolism, a-linoleic acid metabolism, glycophosphatidylinositol-anchored biosynthesis and arachidonic acid metabolism. Conclusion SCEFL may ameliorate the immunosuppression of mice by regulating endogenous metabolic disorder. © 2023 Publication Centre of Anhui Medical University. All rights reserved.