目的:探讨三七总皂苷(PNS)在槟榔碱(ANE)诱导的口腔黏膜下纤维化中的抗纤维化作用,并分析PNS对核因子E2相关因子2(Nrf2)/谷氨酸-半胱氨酸连接酶催化亚基(GCLC)信号通路的影响.方法:采用CCK-8法评估不同浓度的PNS和ANE对人永生化角质形成细胞系HaCaT活力的影响,根据CCK-8结果选择75 mg/L的ANE及25、50和100 mg/L的PNS作为后续实验浓度;细胞设为空白对照组、模型组和PNS低、中、高剂量(25、50和100 mg/L)组,采用Western blot和RT-qPCR法检测各组细胞中I型胶原(COL-I)、上皮钙黏素(E-cadherin)、Nrf2、GCLC和谷胱甘肽还原酶(GR)的蛋白及mRNA表达情况;采用免疫荧光法检测Nrf2入核情况;采用生化试剂盒检测各组细胞中谷胱甘肽(GSH)、还原型烟酰胺腺嘌呤二核苷酸磷酸(NADPH)和丙二醛(MDA)含量及超氧化物歧化酶(SOD)活性;采用DCFH-DA荧光探针检测细胞内活性氧(ROS)含量.结果:与空白对照组相比,模型组细胞中COL-I蛋白及mRNA表达上调,E-cadherin、Nrf2、GCLC、核Nrf2和GR的蛋白及mRNA表达下调,细胞中NADPH、MDA和ROS含量升高,GSH含量和SOD活性明显减弱;与模型组相比,PNS 50和100 mg/L组细胞中COL-I蛋白及mRNA表达下调,E-cadherin、Nrf2、GCLC、核Nrf2和GR的蛋白及mRNA表达上调,细胞中NADPH、MDA和ROS含量下降,GSH含量和SOD活性明显增强(P<0.05,P<0.01).结论:PNS具有抗HaCaT细胞纤维化作用,其作用机制可能与激活Nrf2/GCLC信号通路,进而抗氧化应激改善口腔黏膜下纤维化有关.
AIM:To investigate the anti-fibrotic effect of Panax notoginseng saponins(PNS)in arecoline(ANE)-induced oral submucous fibrosis,and to analyze the effect of PNS on nuclear factor E2-related factor 2(Nrf2)/glu-tamate-cysteine ligase catalytic subunit(GCLC)signaling pathway.METHODS:CCK-8 assay was used to evaluate the effects of different concentrations of PNS and arecoline on the survival rate of human immortalized keratinocyte cell line Ha-CaT.The results of CCK-8 were used to select 75 mg/L arecoline,and 25,50 and 100 mg/L PNS as subsequent experi-mental concentrations.The cells were set as blank control group,model group,and low,medium and high doses(25,50 and 100 mg/L)of PNS groups.The protein and mRNA expressions of collagen type I(COL-I),E-cadherin,Nrf2,GCLC and glutathione reductase(GR)in each group were detected by Western blot and RT-qPCR.Immunofluorescence method was used to detect the entry of Nrf2 into the nucleus.Biochemical kits were used to detect the content of glutathione(GSH),nicotinamide adenine dinucleotide phosphate(NADPH)and malondialdehyde(MDA),and superoxide dis-mutase(SOD)activity in each group of cells.DCFH-DA fluorescent probe was used to detect the content of intracellular reactive oxygen species(ROS).RESULTS:Compared with the blank control group,the protein and mRNA expression of COL-I in the model group was up-regulated,and the protein and mRNA levels of E-cadherin,Nrf2,GCLC,nuclear Nrf2 and GR were down-regulated.The content of NADPH,MDA and ROS in the cells increased,and the content of GSH and the activity of SOD was significantly reduced.Compared with the model group,the protein and mRNA expression of COL-I was down-regulated,and the protein and mRNA expression of E-cadherin,Nrf2,GCLC,nuclear Nrf2 and GR were up-regulated in PNS 50 and 100 mg/L groups.Compared with the model group,the content of NADPH,MDA and ROS in cells decreased,and the content of GSH and the activity of SOD was significantly enhanced(P<0.05 or P<0.01).CON-CLUSION:Panax notoginseng saponins have anti-fibrosis effects in HaCaT cells,and their mechanism may be related to the activation of Nrf2/GCLC signaling pathway,thereby resisting oxidative stress and improving oral submucosal fibrosis.
邹红;祁硕;邓芳萍;张馨月;符舒欣;郭梦琪;肖雨锋;唐群
湖南中医药大学医学院,湖南 长沙 410208
口腔医学
口腔黏膜下纤维化;Nrf2/GCLC信号通路;氧化应激;三七总皂苷;槟榔碱
oral submucous fibrosis;Nrf2/GCLC signaling pathway;oxidative stress;Panax notoginseng sa-ponins;arecoline
《中国病理生理杂志》 2024 (005)
908-916 / 9
湖南省自然科学基金资助项目(No.2021JJ30506);湖南省教育厅重点项目(No.21A0242);湖南省大学生创新创业训练计划-省级项目(No.S202210541130);湖南中医药大学2023年本科生科研创新基金(No.2023-67)
10.3969/j.issn.1000-4718.2024.05.016
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