背景:溶质载体家族1成员5(solute carrier family 1 member 5,SLC1A5)在多种疾病中发挥了潜在作用,但确切作用机制尚不清楚。构建稳定的SLC1A5过表达和敲低细胞模型可为深入研究SLC1A5在疾病中的确切作用机制以及发现潜在治疗靶点提供...背景:溶质载体家族1成员5(solute carrier family 1 member 5,SLC1A5)在多种疾病中发挥了潜在作用,但确切作用机制尚不清楚。构建稳定的SLC1A5过表达和敲低细胞模型可为深入研究SLC1A5在疾病中的确切作用机制以及发现潜在治疗靶点提供有力的实验工具。目的:构建小鼠SLC1A5过表达和敲低的慢病毒载体,以建立稳定转染的RAW264.7细胞株,为深入探讨SLC1A5在炎症中的作用提供实验基础。方法:根据SLC1A5基因序列设计合成引物并使用聚合酶链反应扩增该基因片段。将目的基因定向接入经Age I/Nhe I酶切的载体质粒GV492中构建重组慢病毒质粒,对阳性克隆进一步筛选后测序比对结果;pHelper1.0质粒载体、pHelper2.0质粒载体、目的质粒载体与293T细胞共同培养并转染,获得慢病毒原液进行包装和滴度测定;在此基础上,通过体外培养RAW264.7细胞,确定嘌呤霉素工作质量浓度;不同滴度的慢病毒分别与RAW264.7细胞共同培养,根据荧光强度确定转染效率;用嘌呤霉素挑选出稳定转染细胞,实时荧光定量聚合酶链反应和蛋白免疫印迹方法检测稳定转染细胞株的SLC1A5基因和蛋白表达水平。结果与结论:(1)测序序列与目的序列一致提示重组慢病毒载体构建成功;(2)过表达SLC1A5慢病毒的滴度为1×10~9 TU/mL,敲低SLC1A5慢病毒的滴度为3×10~9 TU/mL;(3)确定RAW264.7细胞嘌呤霉素工作质量浓度为3μg/mL;(4)过表达/敲低SLC1A5慢病毒转染RAW264.7细胞的最佳条件皆为HiTransG P转染增强液且感染复数值等于50;(5)过表达SLC1A5稳转细胞株中SLC1A5基因和蛋白的表达量明显上调,而敲低SLC1A5稳转细胞株中SLC1A5基因和蛋白的表达量显著下调。结果表明,成功构建了小鼠SLC1A5过表达和敲低的慢病毒载体并获得稳定转染的RAW264.7细胞株。展开更多
In patients with Alzheimer’s disease,gamma-glutamyl transferase 5(GGT5)expression has been observed to be downregulated in cerebrovascular endothelial cells.However,the functional role of GGT5 in the development of A...In patients with Alzheimer’s disease,gamma-glutamyl transferase 5(GGT5)expression has been observed to be downregulated in cerebrovascular endothelial cells.However,the functional role of GGT5 in the development of Alzheimer’s disease remains unclear.This study aimed to explore the effect of GGT5 on cognitive function and brain pathology in an APP/PS1 mouse model of Alzheimer’s disease,as well as the underlying mechanism.We observed a significant reduction in GGT5 expression in two in vitro models of Alzheimer’s disease(Aβ_(1-42)-treated hCMEC/D3 and bEnd.3 cells),as well as in the APP/PS1 mouse model.Additionally,injection of APP/PS1 mice with an adeno-associated virus encoding GGT5 enhanced hippocampal synaptic plasticity and mitigated cognitive deficits.Interestingly,increasing GGT5 expression in cerebrovascular endothelial cells reduced levels of both soluble and insoluble amyloid-βin the brains of APP/PS1 mice.This effect may be attributable to inhibition of the expression ofβ-site APP cleaving enzyme 1,which is mediated by nuclear factor-kappa B.Our findings demonstrate that GGT5 expression in cerebrovascular endothelial cells is inversely associated with Alzheimer’s disease pathogenesis,and that GGT5 upregulation mitigates cognitive deficits in APP/PS1 mice.These findings suggest that GGT5 expression in cerebrovascular endothelial cells is a potential therapeutic target and biomarker for Alzheimer’s disease.展开更多
目的研究1型糖尿病患儿血清分泌型卷曲相关蛋白5(Secreted frizzled-related protein 5,SFRP5)的水平与糖脂代谢指标及和微血管并发症的关系。方法以2022年1月-2023年12月于山西省儿童医院就诊的96例1型糖尿病患儿为糖尿病组,选择同时...目的研究1型糖尿病患儿血清分泌型卷曲相关蛋白5(Secreted frizzled-related protein 5,SFRP5)的水平与糖脂代谢指标及和微血管并发症的关系。方法以2022年1月-2023年12月于山西省儿童医院就诊的96例1型糖尿病患儿为糖尿病组,选择同时期在本院接受健康体检的100名正常儿童作为健康组。分别测定两组血清SFRP5水平、空腹血糖(Fasting blood glucose,FBG)、总胆固醇(Total cholesterol,TC)、高密度脂蛋白胆固醇(High density lipoprotein cholesterol,HDL-C)、低密度脂蛋白胆固醇(Low density lipoprotein cholesterin,LDL-C)、三酰甘油(Triacylglycerol,TG)水平以及糖化血红蛋白(Glycosylated hemoglobin,HbA1c),对糖尿病组患儿是否患有微血管并发症进行评估。采用Pearson相关性分析评估血清SFRP5水平与糖脂代谢指标间的相关性。采用受试者工作特征(Receiver operating characteristic,ROC)曲线评估血清SFRP5水平对1型糖尿病合并微血管并发症的诊断效能。结果与健康组比较,糖尿病组FBG、HbA1c、LDL-C和TG水平升高,HDL-C水平降低,差异有统计学意义(P<0.05)。糖尿病组血清SFRP5水平为(352.53±53.69)pg/mL,低于健康组[(424.49±63.54)pg/mL],差异有统计学意义(t=5.453,P<0.05)。糖尿病组血清SFRP5水平与FBG、HbA1c和TG水平呈负相关关系(P<0.05)。1型糖尿病合并微血管并发症儿童的HbA1c和LDL-C水平高于未合并微血管并发症儿童,差异有统计学意义(P<0.05)。与未合并微血管并发症患儿血清SFRP5水平[(363.43±57.24)pg/mL]比较,1型糖尿病合并微血管并发症患儿血清SFRP5水平(315.87±42.35)pg/mL降低,差异有统计学意义(t=4.042,P<0.001)。血清SFRP5水平对1型糖尿病合并微血管并发症诊断效能的曲线下面积为0.838(0.755~0.921),灵敏度为86.4%,特异度为73.0%。结论1型糖尿病患儿血清SFRP5水平低于健康儿童,血清SFRP5水平与血清FBG、HbA1c和TG含量呈负相关,合并微血管并发症的糖尿病患儿血清SFRP5水平低于未合并者。展开更多
基金supported by STI2030-Major Projects,No.2021ZD 0201801(to JG)Shanxi Province Basic Research Program,No.20210302123429(to QS).
文摘In patients with Alzheimer’s disease,gamma-glutamyl transferase 5(GGT5)expression has been observed to be downregulated in cerebrovascular endothelial cells.However,the functional role of GGT5 in the development of Alzheimer’s disease remains unclear.This study aimed to explore the effect of GGT5 on cognitive function and brain pathology in an APP/PS1 mouse model of Alzheimer’s disease,as well as the underlying mechanism.We observed a significant reduction in GGT5 expression in two in vitro models of Alzheimer’s disease(Aβ_(1-42)-treated hCMEC/D3 and bEnd.3 cells),as well as in the APP/PS1 mouse model.Additionally,injection of APP/PS1 mice with an adeno-associated virus encoding GGT5 enhanced hippocampal synaptic plasticity and mitigated cognitive deficits.Interestingly,increasing GGT5 expression in cerebrovascular endothelial cells reduced levels of both soluble and insoluble amyloid-βin the brains of APP/PS1 mice.This effect may be attributable to inhibition of the expression ofβ-site APP cleaving enzyme 1,which is mediated by nuclear factor-kappa B.Our findings demonstrate that GGT5 expression in cerebrovascular endothelial cells is inversely associated with Alzheimer’s disease pathogenesis,and that GGT5 upregulation mitigates cognitive deficits in APP/PS1 mice.These findings suggest that GGT5 expression in cerebrovascular endothelial cells is a potential therapeutic target and biomarker for Alzheimer’s disease.
