目的:探讨昼夜节律因子基因——核受体亚家族1 D组成员1和2(nuclear receptor subfamily 1group D members 1 and 2,NR1D1和NR1D2;分别编码REV-ERBα和REV-ERBβ蛋白)在自然衰老小鼠血管中的表达变化及对血管重塑的影响。方法:(1)将6月...目的:探讨昼夜节律因子基因——核受体亚家族1 D组成员1和2(nuclear receptor subfamily 1group D members 1 and 2,NR1D1和NR1D2;分别编码REV-ERBα和REV-ERBβ蛋白)在自然衰老小鼠血管中的表达变化及对血管重塑的影响。方法:(1)将6月龄小鼠设为青年组,24月龄小鼠设为老年组,每组各6只。称取腓肠肌、脾和胸腺重量并计算相应指数;苏木精-伊红、Masson、油红O、衰老相关β-半乳糖苷酶(senescence-associatedβ-galactosidase,SA-β-Gal)和二氢乙啶染色观察血管病理改变;采用RT-qPCR和Western blot方法检测血管组织中衰老标志物、昼夜节律因子和核因子κB(nuclear factor-κB.NF-κB)/核苷酸结合寡聚化结构域样受体蛋白3(nucleotide-binding oligomerization domain-like receptor protein 3,NLPR3)通路关键因子的表达水平。(2)体外培养人脐静脉内皮细胞(human umbilical vein endothelial cells,HUVEC),用过氧化氢(hydrogen peroxide,H_(2)O_(2))诱导建立衰老细胞模型,并用REV-ERBs激动剂SR9009干预,检测衰老标志物、REV-ERBs及NF-κB/NLPR3通路关键因子的表达。结果:与青年组相比,老年组小鼠体重显著升高,骨骼肌、脾、胸腺重量及其指数显著下降(P<0.05)。老年组小鼠血管中膜厚度增加,纤维化面积、脂质沉积、SA-β-Gal阳性面积、活性氧(reactive oxygen species,ROS)含量和CD68表达均显著升高(P<0.05);老年组小鼠血管组织REV-ERBs的mRNA和蛋白水平显著上调(P<0.05),磷酸化NF-κB和NLRP3蛋白水平,以及白细胞介素1β(interleukin-1β,IL-1β)、IL-6和肿瘤坏死因子α的mRNA表达水平也显著升高(P<0.05)。H_(2)O_(2)可诱导HUVEC衰老,SR9009能显著降低衰老细胞SA-β-Gal阳性率和ROS含量,抑制NF-κB/NLRP3炎症通路相关因子表达(P<0.05)。结论:REV-ERBs可能通过调控NF-κB/NLRP3炎症通路激活,促进血管内皮细胞炎症,进而参与衰老小鼠血管重塑过程。展开更多
Genomic destabilization and defective DNA repair are the most prominent features of tumour cells and are exploited by various chemotherapy drugs for cancer therapy.Long non-coding RNA(lncR-NAs)have emerged as powerful...Genomic destabilization and defective DNA repair are the most prominent features of tumour cells and are exploited by various chemotherapy drugs for cancer therapy.Long non-coding RNA(lncR-NAs)have emerged as powerful regulators of gene expression and are thus involved in diverse biological processes.Recent studies have demonstrated that several lncRNAs play critical roles in DNA repair.Nonetheless,the relationship between DNA damage-responsive lncRNAs and chemoresistance remains poorly defined.In this study,we established four different DNA damage models triggered by cisplatin(DDP),H2O2,neocarzinostatin(NCS)or ultraviolet(UV)irradiation and identified a specific upregu-lated lncRNA(lnc-DUSP6)involved in the cisplatin-induced DNA damage response.Furthermore,loss-or gain-of-function experiments confirmed that lnc-DUSP6 enhanced DNA repair and cell survival under cisplatin treatment,thus promoting cisplatin resistance.Mechanistically,an RNA immunoprecipitation(RIP)assay revealed that lnc-DUSP6 directly interacts with DUSP6(Dual Specificity Phosphatase 6),which is closely associated with cisplatin sensitivity.Additionally,overexpression of DUSP6 significantly rescued the effects of lnc-DUSP6 silencing on DNA repair and cell survival under cisplatin treatment.O-verall,our results show the effect and underlying mechanism of lnc-DUSP6 in cisplatin resistance:lnc-DUSP6 promotes cisplatin-induced DNA damage repair and cisplatin resistance by stabilizing DUSP6,which is highly clinically important for enhancing the efficacy of cisplatin for cancers.展开更多
目的:探究牛结核分枝杆菌减毒株卡介苗(bacillus Calmette-Guérin,BCG)感染人单核-巨噬细胞THP-1后,S100钙结合蛋白A4(S100 calcium-binding protein A4,S100A4)通过磷脂酰肌醇3-激酶(phosphatidylinositol 3-kinase,PI3K)/蛋白激...目的:探究牛结核分枝杆菌减毒株卡介苗(bacillus Calmette-Guérin,BCG)感染人单核-巨噬细胞THP-1后,S100钙结合蛋白A4(S100 calcium-binding protein A4,S100A4)通过磷脂酰肌醇3-激酶(phosphatidylinositol 3-kinase,PI3K)/蛋白激酶B(protein kinase B,PKB/AKT)/哺乳动物雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)信号通路对BCG诱导的巨噬细胞自噬的调控作用。方法:采用S100A4小干扰RNA(S100A4 small interfering RNA,si-S100A4)转染或PI3K抑制剂LY294002预处理THP-1巨噬细胞,并经BCG感染,设置不同处理组和对照组,通过Western blot方法检测PI3K/AKT/mTOR信号通路相关蛋白和自噬相关蛋白[微管相关蛋白1轻链3-II(microtubule-associated protein 1 light chain 3-II,LC3-II)、自噬相关蛋白7(autophagy-related protein 7,Atg7)和beclin-1]的表达,mRFP-GFP-LC3自噬双标腺病毒方法检测自噬流,透射电子显微镜观察细胞中自噬体和自噬溶酶体数量变化。结果:与未感染组相比,BCG感染组中p-PI3K、p-AKT和p-mTOR蛋白水平显著降低(P<0.05)。与BCG感染组相比,si-S100A4+BCG组上述磷酸化蛋白水平显著升高(P<0.05),LC3-II、Atg7和beclin-1蛋白水平显著降低(P<0.01);LY294003+BCG组上述磷酸化蛋白水平显著降低(P<0.01),LC3-II、Atg7和beclin-1蛋白水平显著升高(P<0.05),自噬体和自噬溶酶体数量显著增多(P<0.01)。与si-S100A4+BCG组相比,si-S100A4+LY294002+BCG组中p-PI3K、p-AKT和p-mTOR蛋白水平显著降低(P<0.01),LC3-II、Atg7和beclin-1蛋白水平显著升高(P<0.01),自噬体和自噬溶酶体数量显著增多(P<0.01),胞内菌载量显著减少(P<0.01)。结论:干扰S100A4经由PI3K/AKT/mTOR信号通路对BCG诱导的巨噬细胞自噬具有抑制作用。展开更多
目的·探讨磷脂酰乙醇胺(phosphatidylethanolamine,PE)对巨噬细胞衰老及其衰老相关分泌表型的影响和分子机制,以及PE在肝损伤中的病理生理学意义。方法·利用阿霉素建立巨噬细胞衰老模型,并给予PE处理。通过腹腔联合注射PE和...目的·探讨磷脂酰乙醇胺(phosphatidylethanolamine,PE)对巨噬细胞衰老及其衰老相关分泌表型的影响和分子机制,以及PE在肝损伤中的病理生理学意义。方法·利用阿霉素建立巨噬细胞衰老模型,并给予PE处理。通过腹腔联合注射PE和脂多糖构建小鼠肝损伤模型,观察PE对肝损伤的影响。采用衰老相关β-半乳糖苷酶(senescence-associatedβ-galactosidase,SA-β-gal)染色,结合实时荧光定量PCR、Western blotting等检测细胞周期抑制蛋白p21、肿瘤坏死因子-α(tumor necrosis factor-α,TNF-α)和白介素-6(interleukin-6,IL-6)等衰老标志物及衰老相关分泌表型生物活性因子的表达水平。通过RNA测序结合基因本体论(Gene Ontology,GO)细胞组分富集分析、京都基因与基因组百科全书(Kyoto Encyclopedia of Genes and Genomes,KEGG)通路富集分析、基因集变异分析(Gene Set Variation Analysis,GSVA)和基因集富集分析(Gene Set Enrichment Analysis,GSEA)筛选PE促进巨噬细胞衰老的信号通路及分子机制。通过体内和体外实验检测内质网应激相关通路中肌醇需求酶1α(inositol requiring enzyme 1α,IRE1α)、剪接型X盒结合蛋白1(spliced X box binding protein 1,XBP1s)、转录激活因子6(activating transcription factor 6,ATF6)、ATF4、C/EBP同源蛋白(C/EBP homologous protein,CHOP)的表达。结果·PE显著促进巨噬细胞衰老标志物SA-β-gal、p21、p16及衰老相关分泌表型生物活性因子的表达。RNA测序分析显示内质网应激参与PE促进衰老相关分泌表型表达的作用。进一步的实验表明,PE通过激活巨噬细胞内质网应激信号通路促进巨噬细胞衰老及衰老相关分泌表型表达。体内实验证实PE通过内质网应激加剧脂多糖诱导的小鼠肝损伤。结论·PE通过激活内质网应激信号通路,促进巨噬细胞衰老及衰老相关分泌表型生物活性因子分泌,进而加重脂多糖诱导的肝损伤。展开更多
基金Supported by the National Natural Science Foundation of China(No.82071571)the Natural Science Foundation of Guangdong Province(No.2021A1515010601)+3 种基金Guangdong Provincial Basic and Applied Basic Research Foundation-Dongguan Joint Fund(No.2024A1515140121)the“Climbing”Program of Guangdong Province(No.pdjh2021b0226)the Innovation and Entrepreneurship Program for College Students(No.GDMU2022038,202310571038,ZZDC002,S202510571041)Guangdong Medical University Undergraduate Innovation and Entrepreneurship Education Base Project(No.JDXM2024039,JDXM2025046)。
文摘Genomic destabilization and defective DNA repair are the most prominent features of tumour cells and are exploited by various chemotherapy drugs for cancer therapy.Long non-coding RNA(lncR-NAs)have emerged as powerful regulators of gene expression and are thus involved in diverse biological processes.Recent studies have demonstrated that several lncRNAs play critical roles in DNA repair.Nonetheless,the relationship between DNA damage-responsive lncRNAs and chemoresistance remains poorly defined.In this study,we established four different DNA damage models triggered by cisplatin(DDP),H2O2,neocarzinostatin(NCS)or ultraviolet(UV)irradiation and identified a specific upregu-lated lncRNA(lnc-DUSP6)involved in the cisplatin-induced DNA damage response.Furthermore,loss-or gain-of-function experiments confirmed that lnc-DUSP6 enhanced DNA repair and cell survival under cisplatin treatment,thus promoting cisplatin resistance.Mechanistically,an RNA immunoprecipitation(RIP)assay revealed that lnc-DUSP6 directly interacts with DUSP6(Dual Specificity Phosphatase 6),which is closely associated with cisplatin sensitivity.Additionally,overexpression of DUSP6 significantly rescued the effects of lnc-DUSP6 silencing on DNA repair and cell survival under cisplatin treatment.O-verall,our results show the effect and underlying mechanism of lnc-DUSP6 in cisplatin resistance:lnc-DUSP6 promotes cisplatin-induced DNA damage repair and cisplatin resistance by stabilizing DUSP6,which is highly clinically important for enhancing the efficacy of cisplatin for cancers.
文摘目的:探究牛结核分枝杆菌减毒株卡介苗(bacillus Calmette-Guérin,BCG)感染人单核-巨噬细胞THP-1后,S100钙结合蛋白A4(S100 calcium-binding protein A4,S100A4)通过磷脂酰肌醇3-激酶(phosphatidylinositol 3-kinase,PI3K)/蛋白激酶B(protein kinase B,PKB/AKT)/哺乳动物雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)信号通路对BCG诱导的巨噬细胞自噬的调控作用。方法:采用S100A4小干扰RNA(S100A4 small interfering RNA,si-S100A4)转染或PI3K抑制剂LY294002预处理THP-1巨噬细胞,并经BCG感染,设置不同处理组和对照组,通过Western blot方法检测PI3K/AKT/mTOR信号通路相关蛋白和自噬相关蛋白[微管相关蛋白1轻链3-II(microtubule-associated protein 1 light chain 3-II,LC3-II)、自噬相关蛋白7(autophagy-related protein 7,Atg7)和beclin-1]的表达,mRFP-GFP-LC3自噬双标腺病毒方法检测自噬流,透射电子显微镜观察细胞中自噬体和自噬溶酶体数量变化。结果:与未感染组相比,BCG感染组中p-PI3K、p-AKT和p-mTOR蛋白水平显著降低(P<0.05)。与BCG感染组相比,si-S100A4+BCG组上述磷酸化蛋白水平显著升高(P<0.05),LC3-II、Atg7和beclin-1蛋白水平显著降低(P<0.01);LY294003+BCG组上述磷酸化蛋白水平显著降低(P<0.01),LC3-II、Atg7和beclin-1蛋白水平显著升高(P<0.05),自噬体和自噬溶酶体数量显著增多(P<0.01)。与si-S100A4+BCG组相比,si-S100A4+LY294002+BCG组中p-PI3K、p-AKT和p-mTOR蛋白水平显著降低(P<0.01),LC3-II、Atg7和beclin-1蛋白水平显著升高(P<0.01),自噬体和自噬溶酶体数量显著增多(P<0.01),胞内菌载量显著减少(P<0.01)。结论:干扰S100A4经由PI3K/AKT/mTOR信号通路对BCG诱导的巨噬细胞自噬具有抑制作用。
文摘目的·探讨磷脂酰乙醇胺(phosphatidylethanolamine,PE)对巨噬细胞衰老及其衰老相关分泌表型的影响和分子机制,以及PE在肝损伤中的病理生理学意义。方法·利用阿霉素建立巨噬细胞衰老模型,并给予PE处理。通过腹腔联合注射PE和脂多糖构建小鼠肝损伤模型,观察PE对肝损伤的影响。采用衰老相关β-半乳糖苷酶(senescence-associatedβ-galactosidase,SA-β-gal)染色,结合实时荧光定量PCR、Western blotting等检测细胞周期抑制蛋白p21、肿瘤坏死因子-α(tumor necrosis factor-α,TNF-α)和白介素-6(interleukin-6,IL-6)等衰老标志物及衰老相关分泌表型生物活性因子的表达水平。通过RNA测序结合基因本体论(Gene Ontology,GO)细胞组分富集分析、京都基因与基因组百科全书(Kyoto Encyclopedia of Genes and Genomes,KEGG)通路富集分析、基因集变异分析(Gene Set Variation Analysis,GSVA)和基因集富集分析(Gene Set Enrichment Analysis,GSEA)筛选PE促进巨噬细胞衰老的信号通路及分子机制。通过体内和体外实验检测内质网应激相关通路中肌醇需求酶1α(inositol requiring enzyme 1α,IRE1α)、剪接型X盒结合蛋白1(spliced X box binding protein 1,XBP1s)、转录激活因子6(activating transcription factor 6,ATF6)、ATF4、C/EBP同源蛋白(C/EBP homologous protein,CHOP)的表达。结果·PE显著促进巨噬细胞衰老标志物SA-β-gal、p21、p16及衰老相关分泌表型生物活性因子的表达。RNA测序分析显示内质网应激参与PE促进衰老相关分泌表型表达的作用。进一步的实验表明,PE通过激活巨噬细胞内质网应激信号通路促进巨噬细胞衰老及衰老相关分泌表型表达。体内实验证实PE通过内质网应激加剧脂多糖诱导的小鼠肝损伤。结论·PE通过激活内质网应激信号通路,促进巨噬细胞衰老及衰老相关分泌表型生物活性因子分泌,进而加重脂多糖诱导的肝损伤。
