目的:探讨膜肾方对特发性膜性肾病大鼠血浆诱导损伤足细胞的干预作用及其机制。方法:建立特发性膜性肾病大鼠模型,用肝素钠作为抗凝剂收集其血浆样品并诱导足细胞损伤,分对照组、模型组、膜肾方组、膜肾方+C3a受体(C3aR)拮抗剂组、C3aR...目的:探讨膜肾方对特发性膜性肾病大鼠血浆诱导损伤足细胞的干预作用及其机制。方法:建立特发性膜性肾病大鼠模型,用肝素钠作为抗凝剂收集其血浆样品并诱导足细胞损伤,分对照组、模型组、膜肾方组、膜肾方+C3a受体(C3aR)拮抗剂组、C3aR拮抗剂组。采用Western blotting检测各组足细胞C3aR、磷脂酶A2受体(PLA2R)、磷酸化细胞外信号调节激酶1/2(p-ERK1/2)、磷酸化细胞浆型磷脂酶A2(p-cPLA2)蛋白表达水平;酶联免疫吸附试验(ELISA)检测上清液C3a表达水平;Real-time PCR测定Synaptopodin mRNA、C3aR m RNA、PLA2R mRNA表达水平;细胞计数试剂盒-8(CCK-8)检测各组足细胞活力。结果:与对照组比较,模型组足细胞C3aR、PLA2R、p-ERK1/2、p-cPLA2表达水平均升高,上清液C3a水平升高,Synaptopodin m RNA水平下降,C3aR mRNA、PLA2R mRNA水平升高,足细胞活力下降,差异均有统计学意义(P<0.01);与模型组比较,膜肾方组足细胞C3aR、PLA2R、p-ERK1/2、p-cPLA2表达水平均下降,上清液C3a水平下降,Synaptopodin m RNA水平升高,C3aR mRNA、PLA2R mRNA水平下降,足细胞活力改善,差异均有统计学意义(P<0.01);与膜肾方组比较,膜肾方+C3aR拮抗剂组及C3aR拮抗剂组足细胞C3aR、PLA2R、p-ERK1/2、p-cPLA2表达水平均下降,上清液C3a水平下降,Synaptopodin mRNA水平升高,C3aR m RNA、PLA2R mRNA水平下降,足细胞活力改善,膜肾方+C3aR拮抗剂组更明显,差异均有统计学意义(P<0.01)。结论:膜肾方可能通过调控C3a/C3aR通路,下调PLA2R水平,稳定足细胞骨架,改善足细胞活力,从而发挥对足细胞的保护作用。展开更多
Objective:Breast cancer is the most common malignancy in women and is characterized by a high recurrence rate that severely impacts patient survival.Regulatory T cells(Tregs)in the tumor microenvironment(TME)promote i...Objective:Breast cancer is the most common malignancy in women and is characterized by a high recurrence rate that severely impacts patient survival.Regulatory T cells(Tregs)in the tumor microenvironment(TME)promote immune evasion and metastasis,increasing recurrence risk.This study determined how the epigenetic regulators,DNMT3A and METTL7A,modulate Treg infiltration via the DDR1/STAT3/CXCL5 axis and influence breast cancer recurrence and prognosis.Methods:RNA sequencing(RNA-seq)was used to identify differentially expressed genes(DEGs),followed by Gene Ontology(GO)and Kyoto Encyclopedia of Genes and Genomes(KEGG)enrichment.Machine learning algorithms,including least absolute shrinkage and selection operator(LASSO),supported vector machine-recursive feature elimination(SVM-RFE)and ElasticNet identified DDR1 as a key gene.Validation included RT-qPCR,western blot,MSP,MeRIP-qPCR,and Co-IP to assess epigenetic regulation.Functional assays(CCK-8,Transwell,and Treg differentiation/chemotaxis)and xenograft models evaluated the role of DDR1 in tumor progression and recurrence.Results:DNMT3A upregulated DDR1 via DNA methylation,while METTL7A enhanced DDR1 mRNA stability via m6A modification.Co-regulation activated the DDR1/STAT3/CXCL5 axis,which boosted cancer cell proliferation,migration,and invasion.CXCL5 secretion increased Treg infiltration and accelerated tumor growth in vivo.DDR1 silencing reversed these effects,confirming that DDR1 has a pivotal role in breast cancer recurrence.Conclusion:DNMT3A and METTL7A were shown to cooperatively regulate DDR1 via DNA/m6A methylation,which drives Tregmediated immune suppression and recurrence.This study provided novel insights and therapeutic targets for breast cancer prognosis and treatment.展开更多
目的基于受试者工作特征(receiver operating characteristic,ROC)曲线和决策曲线分析(decision curve analysis,DCA)探讨血清Wnt家庭成员3A(WNT family member 3A,Wnt3A)、血清尿酸与肌酐比值(serum uric acid/creatinine ratio,SUA/S...目的基于受试者工作特征(receiver operating characteristic,ROC)曲线和决策曲线分析(decision curve analysis,DCA)探讨血清Wnt家庭成员3A(WNT family member 3A,Wnt3A)、血清尿酸与肌酐比值(serum uric acid/creatinine ratio,SUA/Scr)、能量平衡相关蛋白(adropin)对血液透析患者预后的预测价值。方法前瞻性选取2022年9月—2024年9月中国人民解放军第三〇五医院血液透析的患者为研究组,根据预后分为预后不良和预后良好组。另选取同期非血液透析慢性肾脏病(chronic kidney disease,CKD)患者为对照组。酶联免疫吸附法检测血清Wnt3A、adropin水平,全自动生化分析仪检测SUA和Scr水平,并计算SUA/Scr。多因素Logistic分析预后的影响因素;ROC曲线分析Wnt3A、SUA/Scr、adropin对预后的预测价值;DCA评估预测模型的临床应用价值。结果研究组、对照组分别纳入204例患者,研究组Wnt3A高于对照组,SUA/Scr、adropin低于对照组(t/Z=8.377、14.621、12.759,均P<0.001);根据1年随访结果,将研究组患者分为预后良好组(n=141)和预后不良组(n=63),其中预后不良组患者Wnt3A、SUA/Scr高于预后良好组,adropin水平低于预后良好组(t/Z=8.138、6.934、10.811,均P<0.001);多因素Logistic分析结果显示:年龄、透析龄、全段甲状旁腺激素、Wnt3A、SUA/Scr和Adropin是血液透析患者预后不良的影响因素[OR=1.261(95%CI:1.049~1.516)、1.762(95%CI:1.177~2.638)、1.553(95%CI:1.171~2.059)、1.892(95%CI:1.319~2.714)、1.942(95%CI:1.310~2.880)、0.449(95%CI:0.270~0.746),P=0.014、0.006、0.002、0.001、0.001、0.002];ROC表明Wnt3A、SUA/Scr、adropin联合预测预后不良的曲线下面积(area under the curve,AUC)为0.953(95%CI:0.928~0.979),大于单独预测[Wnt3A:AUC=0.803、SUA/Scr:AUC=0.822,SUA/Scr:AUC=0.837(ZWnt3A、SUA/Scr、adropin=4.121、3.693、3.650,均P<0.001)],DCA结果提示联合预测预后在高风险阈值为0.04~0.95时,净获益率高于单独预测。结论血液透析预后不良患者血清Wnt3A、SUA/Scr水平升高,adropin水平降低,三者联合检测对预后预测价值较高。展开更多
Activation of spinal cord neural stem cells(NSCs)and subsequent neurogenesis holds a promising alternative for spinal cord injury(SCI)repair.Our previous study demonstrated that complement C3a,derived from reactive as...Activation of spinal cord neural stem cells(NSCs)and subsequent neurogenesis holds a promising alternative for spinal cord injury(SCI)repair.Our previous study demonstrated that complement C3a,derived from reactive astrocytes,inhibits NSC proliferation by suppressing protein aggregate clearance through the deubiquitinating enzyme ubiquitin carboxy-terminal hydrolase L1(UCHL1)-proteasome system post-SCI.However,the potential molecular mechanism by which C3a modulates NSC activation via this pathway remains unclear.Here,we revealed that C3a/C3a receptor(C3aR)signaling activated NF-κB p65,which in turn inhibited Nrf2 activity and UCHL1 expression,resulting in diminished proteasome activity and the accumulation of protein aggregates,and ultimately impaired NSC activation.Both knockdown of NF-κB p65 and Nrf2 upregulation restored UCHL1 expression and proteasome activity in vitro,promoting NSC activation by enhancing protein aggregate clearance.Mechanistically,we found that NF-κB p65 regulated Nrf2 activity through a dual mechanism:(1)promoting Keap1-dependent ubiquitination and proteasome degradation of Nrf2;(2)inhibiting protein kinase C-mediated Nrf2 phosphorylation and nuclear translocation.Using the dual-luciferase reporter assay and chromatin immunoprecipitation(ChIP)analysis,we further identified UCHL1 as a direct transcriptional target of Nrf2.Importantly,in vivo experiments using SCI mice confirmed that either C3aR blockade,NF-κB p65 knockdown,or Nrf2 overexpression could rescue SCI-induced UCHL1 downregulation.Together,this study uncovers the C3a-NF-κB p65-Nrf2-UCHL1-proteasome axis as a critical regulator of NSC activation after SCI.This may provide novel molecular targets and intervention strategies for SCI repair.展开更多
摘要目的:探讨膜肾方对特发性膜性肾病大鼠血浆诱导损伤足细胞的干预作用及其机制。方法:建立特发性膜性肾病大鼠模型,用肝素钠作为抗凝剂收集其血浆样品并诱导足细胞损伤,分对照组、模型组、膜肾方组、膜肾方+C3a受体(C3aR)拮抗剂组、C3aR拮抗剂组。采用Western blotting检测各组足细胞C3aR、磷脂酶A2受体(PLA2R)、磷酸化细胞外信号调节激酶1/2(p-ERK1/2)、磷酸化细胞浆型磷脂酶A2(p-cPLA2)蛋白表达水平;酶联免疫吸附试验(ELISA)检测上清液C3a表达水平;Real-time PCR测定Synaptopodin mRNA、C3aR m RNA、PLA2R mRNA表达水平;细胞计数试剂盒-8(CCK-8)检测各组足细胞活力。结果:与对照组比较,模型组足细胞C3aR、PLA2R、p-ERK1/2、p-cPLA2表达水平均升高,上清液C3a水平升高,Synaptopodin m RNA水平下降,C3aR mRNA、PLA2R mRNA水平升高,足细胞活力下降,差异均有统计学意义(P<0.01);与模型组比较,膜肾方组足细胞C3aR、PLA2R、p-ERK1/2、p-cPLA2表达水平均下降,上清液C3a水平下降,Synaptopodin m RNA水平升高,C3aR mRNA、PLA2R mRNA水平下降,足细胞活力改善,差异均有统计学意义(P<0.01);与膜肾方组比较,膜肾方+C3aR拮抗剂组及C3aR拮抗剂组足细胞C3aR、PLA2R、p-ERK1/2、p-cPLA2表达水平均下降,上清液C3a水平下降,Synaptopodin mRNA水平升高,C3aR m RNA、PLA2R mRNA水平下降,足细胞活力改善,膜肾方+C3aR拮抗剂组更明显,差异均有统计学意义(P<0.01)。结论:膜肾方可能通过调控C3a/C3aR通路,下调PLA2R水平,稳定足细胞骨架,改善足细胞活力,从而发挥对足细胞的保护作用。
基金supported by the National Natural Science Foundation of China(Grant No.82060479)Key Research and Development Program of Ningxia Hui Autonomous Region(Grant No.2021BEG03062)Ningxia Natural Science Fund Key Project(Grant No.2024AAC02080).
摘要Objective:Breast cancer is the most common malignancy in women and is characterized by a high recurrence rate that severely impacts patient survival.Regulatory T cells(Tregs)in the tumor microenvironment(TME)promote immune evasion and metastasis,increasing recurrence risk.This study determined how the epigenetic regulators,DNMT3A and METTL7A,modulate Treg infiltration via the DDR1/STAT3/CXCL5 axis and influence breast cancer recurrence and prognosis.Methods:RNA sequencing(RNA-seq)was used to identify differentially expressed genes(DEGs),followed by Gene Ontology(GO)and Kyoto Encyclopedia of Genes and Genomes(KEGG)enrichment.Machine learning algorithms,including least absolute shrinkage and selection operator(LASSO),supported vector machine-recursive feature elimination(SVM-RFE)and ElasticNet identified DDR1 as a key gene.Validation included RT-qPCR,western blot,MSP,MeRIP-qPCR,and Co-IP to assess epigenetic regulation.Functional assays(CCK-8,Transwell,and Treg differentiation/chemotaxis)and xenograft models evaluated the role of DDR1 in tumor progression and recurrence.Results:DNMT3A upregulated DDR1 via DNA methylation,while METTL7A enhanced DDR1 mRNA stability via m6A modification.Co-regulation activated the DDR1/STAT3/CXCL5 axis,which boosted cancer cell proliferation,migration,and invasion.CXCL5 secretion increased Treg infiltration and accelerated tumor growth in vivo.DDR1 silencing reversed these effects,confirming that DDR1 has a pivotal role in breast cancer recurrence.Conclusion:DNMT3A and METTL7A were shown to cooperatively regulate DDR1 via DNA/m6A methylation,which drives Tregmediated immune suppression and recurrence.This study provided novel insights and therapeutic targets for breast cancer prognosis and treatment.
摘要目的基于受试者工作特征(receiver operating characteristic,ROC)曲线和决策曲线分析(decision curve analysis,DCA)探讨血清Wnt家庭成员3A(WNT family member 3A,Wnt3A)、血清尿酸与肌酐比值(serum uric acid/creatinine ratio,SUA/Scr)、能量平衡相关蛋白(adropin)对血液透析患者预后的预测价值。方法前瞻性选取2022年9月—2024年9月中国人民解放军第三〇五医院血液透析的患者为研究组,根据预后分为预后不良和预后良好组。另选取同期非血液透析慢性肾脏病(chronic kidney disease,CKD)患者为对照组。酶联免疫吸附法检测血清Wnt3A、adropin水平,全自动生化分析仪检测SUA和Scr水平,并计算SUA/Scr。多因素Logistic分析预后的影响因素;ROC曲线分析Wnt3A、SUA/Scr、adropin对预后的预测价值;DCA评估预测模型的临床应用价值。结果研究组、对照组分别纳入204例患者,研究组Wnt3A高于对照组,SUA/Scr、adropin低于对照组(t/Z=8.377、14.621、12.759,均P<0.001);根据1年随访结果,将研究组患者分为预后良好组(n=141)和预后不良组(n=63),其中预后不良组患者Wnt3A、SUA/Scr高于预后良好组,adropin水平低于预后良好组(t/Z=8.138、6.934、10.811,均P<0.001);多因素Logistic分析结果显示:年龄、透析龄、全段甲状旁腺激素、Wnt3A、SUA/Scr和Adropin是血液透析患者预后不良的影响因素[OR=1.261(95%CI:1.049~1.516)、1.762(95%CI:1.177~2.638)、1.553(95%CI:1.171~2.059)、1.892(95%CI:1.319~2.714)、1.942(95%CI:1.310~2.880)、0.449(95%CI:0.270~0.746),P=0.014、0.006、0.002、0.001、0.001、0.002];ROC表明Wnt3A、SUA/Scr、adropin联合预测预后不良的曲线下面积(area under the curve,AUC)为0.953(95%CI:0.928~0.979),大于单独预测[Wnt3A:AUC=0.803、SUA/Scr:AUC=0.822,SUA/Scr:AUC=0.837(ZWnt3A、SUA/Scr、adropin=4.121、3.693、3.650,均P<0.001)],DCA结果提示联合预测预后在高风险阈值为0.04~0.95时,净获益率高于单独预测。结论血液透析预后不良患者血清Wnt3A、SUA/Scr水平升高,adropin水平降低,三者联合检测对预后预测价值较高。
基金supported by the National Natural Science Foundation of China(82071362 and 82270669)Key Project of the Regional Joint Fund of Guangdong Province(2023B1515120077)+3 种基金Basic Research Program of Shenzhen Science and Technology Innovation Commission(JCYJ20210324123001003 and JCYJ20220530144801003)Shenzhen Key Laboratory of Bone Tissue Repair and Translational Research(ZDSYS20230626091402006)the Innovation and Entrepreneurship Training Program for College Students,Sun Yat-sen University(20242150)the Leading Innovation and Entrepreneurship Team Program of Zhejiang Province,China(2023R01005).
摘要Activation of spinal cord neural stem cells(NSCs)and subsequent neurogenesis holds a promising alternative for spinal cord injury(SCI)repair.Our previous study demonstrated that complement C3a,derived from reactive astrocytes,inhibits NSC proliferation by suppressing protein aggregate clearance through the deubiquitinating enzyme ubiquitin carboxy-terminal hydrolase L1(UCHL1)-proteasome system post-SCI.However,the potential molecular mechanism by which C3a modulates NSC activation via this pathway remains unclear.Here,we revealed that C3a/C3a receptor(C3aR)signaling activated NF-κB p65,which in turn inhibited Nrf2 activity and UCHL1 expression,resulting in diminished proteasome activity and the accumulation of protein aggregates,and ultimately impaired NSC activation.Both knockdown of NF-κB p65 and Nrf2 upregulation restored UCHL1 expression and proteasome activity in vitro,promoting NSC activation by enhancing protein aggregate clearance.Mechanistically,we found that NF-κB p65 regulated Nrf2 activity through a dual mechanism:(1)promoting Keap1-dependent ubiquitination and proteasome degradation of Nrf2;(2)inhibiting protein kinase C-mediated Nrf2 phosphorylation and nuclear translocation.Using the dual-luciferase reporter assay and chromatin immunoprecipitation(ChIP)analysis,we further identified UCHL1 as a direct transcriptional target of Nrf2.Importantly,in vivo experiments using SCI mice confirmed that either C3aR blockade,NF-κB p65 knockdown,or Nrf2 overexpression could rescue SCI-induced UCHL1 downregulation.Together,this study uncovers the C3a-NF-κB p65-Nrf2-UCHL1-proteasome axis as a critical regulator of NSC activation after SCI.This may provide novel molecular targets and intervention strategies for SCI repair.