Sepsis-associated encephalopathy(SAE)is a severe neurological syndrome marked by widespread brain dysfunctions due to sepsis,yet the underlying mechanisms remain elusive.The current study,using a Lipopolysaccharide(LP...Sepsis-associated encephalopathy(SAE)is a severe neurological syndrome marked by widespread brain dysfunctions due to sepsis,yet the underlying mechanisms remain elusive.The current study,using a Lipopolysaccharide(LPS)-induced septic rat model,revealed the hyperphosphorylation of tau and cognitive impairments,accompanied by the release of inflammatory cytokines and activation of glial cells in the hippocampal dentate gyrus region of septic rats.Proteomic and bioinformatic analyses identified C-X-C motif chemokine ligand 10(CXCL10)as a central regulator of neuroinflammation.LPS triggered CXCL10 secretion in astrocytes,and astrocyte-conditioned medium from LPS-treated astrocytes induced tau hyperphosphorylation and synaptic deficits.Recombinant CXCL10 recapitulated these effects in vitro and in vivo.Blocking CXCL10–CXCR3 interaction reversed tau phosphorylation,synaptic impairment,and cognitive decline.Mechanistically,CXCL10–CXCR3 interaction activated CaMKII,driving tau hyperphosphorylation,while CaMKII inhibition restored synaptic protein levels.These findings establish CXCL10 as a key driver of tau pathology in SAE and suggest CXCL10–CXCR3 as a therapeutic target for sepsis-induced cognitive impairments.展开更多
目的探索敲低CXCL8对宫颈鳞状细胞癌紫杉醇化疗疗效的影响,并深入探究其潜在的作用机制。方法采用宫颈癌Hela细胞系,通过慢病毒介导的RNA干扰(RNAi)技术特异性地抑制CXCL8基因的表达。以HitransG P、复感染指数(multiplicity of infecti...目的探索敲低CXCL8对宫颈鳞状细胞癌紫杉醇化疗疗效的影响,并深入探究其潜在的作用机制。方法采用宫颈癌Hela细胞系,通过慢病毒介导的RNA干扰(RNAi)技术特异性地抑制CXCL8基因的表达。以HitransG P、复感染指数(multiplicity of infection,MOI)=100为最佳转染条件,CCK-8实验筛选嘌呤霉素最佳干预浓度为1.5μg/mL;按最佳转染条件将LV-CXCL8-RNAi(3靶点)和阴性对照慢病毒转染至Hela细胞中,并设置空白对照组,qRT-PCR实验选定sh-CXCL8-13组慢病毒为后续实验的干预序列及病毒。实验分为空白对照组、阴性对照组、sh-CXCL8组、紫杉醇组以及sh-CXCL8+紫杉醇组。通过CCK-8实验和细胞侵袭实验评估Hela细胞的增殖活性及侵袭能力,利用qRT-PCR和Western blot实验检测CXCL8、Bcl2、Bax及β-actin的表达水平。结果与其余四组相比,sh-CXCL8+紫杉醇组Hela细胞活性及侵袭性显著降低,差异有统计学意义(P<0.05)。qRT-PCR结果显示,sh-CXCL8+紫杉醇组中CXCL8、Bcl2、PIK3CB以及Akt1基因的表达量显著降低,Bax基因表达量明显上升,组间差异有统计学意义(P<0.05)。Western blot实验结果显示,sh-CXCL8+紫杉醇组中CXCL8、PIK3CB和p-Akt1蛋白的表达量降低(P<0.05)。结论敲低CXCL8可以降低Hela细胞增殖与侵袭能力,可能是通过影响PI3K/Akt通路来影响Hela细胞对紫杉醇的药物敏感性。展开更多
基金supported by Grants from the National Natural Science Foundation of China(82330041 and 82201326)the China Postdoctoral Research Foundation(GZC20230898)the Science and Technology Innovation Team Project to Xiaochuan Wang from the Department of Science and Technology of Hubei Province(2022-72-18).
文摘Sepsis-associated encephalopathy(SAE)is a severe neurological syndrome marked by widespread brain dysfunctions due to sepsis,yet the underlying mechanisms remain elusive.The current study,using a Lipopolysaccharide(LPS)-induced septic rat model,revealed the hyperphosphorylation of tau and cognitive impairments,accompanied by the release of inflammatory cytokines and activation of glial cells in the hippocampal dentate gyrus region of septic rats.Proteomic and bioinformatic analyses identified C-X-C motif chemokine ligand 10(CXCL10)as a central regulator of neuroinflammation.LPS triggered CXCL10 secretion in astrocytes,and astrocyte-conditioned medium from LPS-treated astrocytes induced tau hyperphosphorylation and synaptic deficits.Recombinant CXCL10 recapitulated these effects in vitro and in vivo.Blocking CXCL10–CXCR3 interaction reversed tau phosphorylation,synaptic impairment,and cognitive decline.Mechanistically,CXCL10–CXCR3 interaction activated CaMKII,driving tau hyperphosphorylation,while CaMKII inhibition restored synaptic protein levels.These findings establish CXCL10 as a key driver of tau pathology in SAE and suggest CXCL10–CXCR3 as a therapeutic target for sepsis-induced cognitive impairments.
