摘要
目的:探讨大黄素调节高迁移率族蛋白B1(HMGB1)/Toll样受体4(TLR4)信号通路对脂多糖(LPS)诱导的人牙髓成纤维细胞(HDPFs)焦亡的影响。方法:分离培养HDPFs,筛选大黄素最佳浓度,随机将HDPFs分成control组(正常培养)、LPS组、大黄素低、中、高剂量组、pcDNA组(转染pcDNA3.1)和pcDNA-HMGB1组(转染pcDNA3.1-HMGB1),qRT-PCR检测细胞中HMGB1 mRNA表达水平,MTT法、平板克隆实验、流式细胞仪分别检测细胞增殖和焦亡;ELISA检测细胞上清中IL-18、IL-1β、TNF-α水平;Western blot检测细胞中焦亡蛋白Nod样受体蛋白3(NLRP3)、剪切的半胱天冬氨酸蛋白酶-1(cleaved Caspase-1)、消皮素D(GSDMD)及HMGB1、TLR4蛋白表达。结果:与control组比较,LPS组细胞HMGB1 mRNA水平、焦亡率、IL-18、IL-1β、TNF-α水平、NLRP3、cleaved Caspase-1、GSDMD、HMGB1、TLR4蛋白水平显著升高,A 490值、集落形成数显著降低(P<0.05);与LPS组比较,大黄素低、中、高剂量组细胞中以上各项指标水平显著降低,A 490值、集落形成数显著升高,其中大黄素高剂量组变化更显著(P<0.05);过表达HMGB1减弱了大黄素对LPS诱导的HDPFs细胞焦亡和炎症的抑制作用,及对细胞增殖的促进作用(P<0.05)。结论:大黄素通过抑制HMGB1/TLR4通路,抑制NLRP3炎症体活化,从而减轻LPS诱导的HDPFs细胞焦亡。
Objective:To investigate the effects of emodin on lipopolysaccharide(LPS)induced pyroptosis of human dental pulp fibroblasts(HDPFs)by regulating the high mobility group protein B1(HMGB1)/Toll-like receptor 4(TLR4)signaling pathway.Methods:HDPFs were in vitro cultured and grouped into control(normal culture),LPS with low,medium and high dose emodin groups,pcDNA(transfected with pcDNA3.1)and pcDNA-HMGB1 groups(transfected with pcDNA3.1 HMMGB1).qRT-PCR was applied to detect the expression level of HMGB1 mRNA in cells,MTT assay,plate cloning assay and flow cytometry were applied to detect cell proliferation and pyrotosis,respectively.ELISA was applied to detect levels of IL-18,IL-1βand TNF-αin cell supernatant.Western blot was applied to detect the expression of pyroptosis protein Nod-like receptor protein 3(NLRP3),cleaved caspase-1,GSDMD,HMGB1 and TLR4 proteins in the cells.Results:Compared with the control group,the HMGB1 mRNA level,pyrotosis rate,IL-18,IL-1β,TNF-αlevels,NLRP3,cleaved Caspase-1,GSDMD,HMGB1,TLR4 protein levels in the LPS group obviously increased,the A 490 value and colony formation obviously decreased(P<0.05).Compared with the LPS group,the above indicators in the low,medium,and high dose emodin groups decreased,the A 490 value and colony formation increased,the high-dose emodin group showed more obvious changes(P<0.05);overexpression of HMGB1 attenuated the inhibitory effects of emodin on LPS-induced pyroptosis and inflammation of HDPFs,and promoted cell proliferation(P<0.05).Conclusion:Emodin inhibit the activation of NLRP3 inflammasome by inhibiting the HMGB1/TLR4 pathway,thereby reduces LPS induced pyroptosis of HDPFs.
作者
付广丽
宋利娟
涂玲
FU Guangli;SONG Lijuan;TU Ling(Department of Paediatric Dentistry,Southwest Medical University Affiliated Stomatological Hospital,China,646000 Luzhou)
出处
《实用口腔医学杂志》
CAS
CSCD
北大核心
2024年第5期631-637,共7页
Journal of Practical Stomatology
