目的探讨慢性阻塞性肺疾病(COPD)患者血清G蛋白偶联受体43(GPR43)、甲基转移酶3(METTL3)水平表达与肺功能和气流受限程度的相关性。方法选取2019年1月~2024年5月成都市第六人民医院收治的COPD患者150例(COPD组)和同期健康体检志愿者150...目的探讨慢性阻塞性肺疾病(COPD)患者血清G蛋白偶联受体43(GPR43)、甲基转移酶3(METTL3)水平表达与肺功能和气流受限程度的相关性。方法选取2019年1月~2024年5月成都市第六人民医院收治的COPD患者150例(COPD组)和同期健康体检志愿者150例(对照组)。根据气流受限程度将COPD患者分为轻度组(n=61)、中度组(n=46)和重度/极重度组(n=43)。检测血清GPR43、METTL3水平并测定肺功能[第1秒用力呼气容积(FEV1)/用力肺活量(FVC)、FEV1占预计值%(%pred)]。Spearman相关性分析血清GPR43、METTL3水平与肺功能指标的相关性;通过多元有序Logistic回归分析血清GPR43、METTL3水平与COPD患者气流受限程度的关系,使用受试者工作特征(ROC)曲线分析其评估效能。结果与对照组比较,COPD组血清GPR43水平(5.32±1.07ng/ml vs 7.61±1.59ng/ml),FEV1/FVC比值[54.17(43.77,63.60)%vs 80.78(76.24,88.22)%]和FEV1%pred[72.25(44.94,84.22)%vs 93.06(89.71、95.54)%]显著降低(t/Z=-14.591,-14.247,-14.108),而METTL3水平(41.73±5.27pg/ml vs 31.85±5.03pg/ml)显著升高(t=16.614),差异具有统计学意义(均P<0.001)。重度/极重度组血清GPR43水平低于轻度、中度组(4.57±0.77ng/ml vs 5.98±1.05ng/ml、5.16±0.79 ng/ml),中度组低于轻度组(t=7.474、3.598、4.391),重度/极重度组血清METTL3水平高于轻度组、中度组(45.76±5.24pg/ml vs 38.83±4.20pg/ml、41.82±4.00pg/ml),中度组高于轻度组(t=-7.474、-4.003、-3.722),差异具有统计学意义(均P<0.001)。COPD患者FEV1/FVC比值、FEV1%pred与血清GPR43水平呈正相关(r=0.762、0.768,均P<0.001),与METTL3水平呈负相关(r=-0.758、-0.778,均P<0.001)。GPR43为COPD气流受限的独立保护因素(OR=0.689,Waldχ^(2)=14.064,P<0.05),METTL3为独立危险因素(OR=1.251,Waldχ^(2)=4.500,P<0.05)。血清GPR43与METTL3联合评估COPD重度/极重度气流受限的曲线下面积(AUC)优于GPR43和METTL3单独检测,差异具有统计学意义(Z=3.231、3.374,均P<0.05)。结论COPD患者血清GPR43水平降低、METTL3水平升高,与肺功能降低和气流受限程度加重有关,血清GPR43,METTL3水平联合评估COPD患者重度/极重度气流受限的价值较高。展开更多
To investigate the effects of extrusion temperature on the microstructure and mechanical properties of WE43 magnesium alloy,extrusion experiments were conducted under 330,380,430,and 450℃,and the extrusion ratio was ...To investigate the effects of extrusion temperature on the microstructure and mechanical properties of WE43 magnesium alloy,extrusion experiments were conducted under 330,380,430,and 450℃,and the extrusion ratio was 16.The experimental results indicate that,at a low temperature of 330℃,the alloy precipitates a large amount of second phases rich in Zr elements.Moreover,the texture strength and kernel average misorientation value are the highest,with values of 27.77 and 0.71,respectively.The increase in extrusion temperature leads to a gradual decrease in texture strength and kernel average misorientation value.The strength of the alloy is the highest at an extrusion temperature of 330℃.Its tensile yield stress is 254.7 MPa and ultimate tensile strength is 302.7 MPa,respectively.As the extrusion temperature increases,the strength of the alloy gradually decreases.At an extrusion temperature of 450℃,the tensile yield stress is 181.3 MPa and ultimate tensile strength is 265.7 MPa,respectively.The elongation first increases and then decreases,with an elongation of 20.9%at an extrusion temperature of 330℃.At an extrusion temperature of 430℃,the elongation reaches its maximum value,which is 23.6%.At an extrusion temperature of 450℃,the elongation reaches its lowest value,which is 16.4%.展开更多
Amyotrophic lateral sclerosis is a devastating neurodegenerative disease marked by progressive motor neuron degeneration.Despite extensive research,effective treatments remain elusive,underscoring the need to explore ...Amyotrophic lateral sclerosis is a devastating neurodegenerative disease marked by progressive motor neuron degeneration.Despite extensive research,effective treatments remain elusive,underscoring the need to explore the molecular mechanisms driving disease progression.The amyotrophic lateral sclerosis complexity is further compounded by its large heterogeneity,encompassing both genetic and sporadic forms,diverse phenotypic presentations,and highly variable progression rates.A key pathological feature of amyotrophic lateral sclerosis is the aggregation of TAR DNA-binding protein 43,which contributes to cellular toxicity,neuroinflammation,and neuronal dysfunction.This review explores the complex interplay between TAR DNA-binding protein 43 pathology,immunity dysregulation,and the gut-brain axis,with a focus on the role of microbiome-derived metabolites in amyotrophic lateral sclerosis.Neuroinflammation,mediated by both innate and adaptive immunity,plays a central role in disease pathogenesis,with TAR DNA-binding protein 43 influencing immune signaling and exacerbating neurotoxicity.Additionally,disruptions in gut microbiota composition and intestinal barrier integrity,frequently observed in amyotrophic lateral sclerosis patients,suggest a potential role for the gut-brain axis in modulating neurodegenerative processes.By integrating evidence from emerging studies,our aim is to clarify how TAR DNA-binding protein 43 aggregation contributes to neuroinflammation and immune dysfunction while exploring the gut microbiota role as both a modulator and potential biomarker of disease.Understanding these interactions could pave the way for novel therapeutic strategies,including microbiome-targeted interventions such as probiotics,dietary modifications,or immune-modulating therapies.Finally,unraveling the TAR DNA-binding protein 43-immune system-microbiome axis may offer new avenues for personalized treatments aimed at mitigating neuroinflammation,slowing amyotrophic lateral sclerosis progression,and improving patient outcomes and life quality.展开更多
由于稀土(RE)元素在激光粉末床熔融(Laser powder bed fusion,LPBF)制备的WE43合金中具有超高的固溶度,因此本文省去固溶处理过程,直接对其进行T5时效处理,研究了T5时效处理对其微观组织、物相、缺陷以及拉伸性能的影响。结果表明:T5时...由于稀土(RE)元素在激光粉末床熔融(Laser powder bed fusion,LPBF)制备的WE43合金中具有超高的固溶度,因此本文省去固溶处理过程,直接对其进行T5时效处理,研究了T5时效处理对其微观组织、物相、缺陷以及拉伸性能的影响。结果表明:T5时效处理后,WE43合金中的椭圆形和鱼鳞纹组织消失,平均晶粒尺寸由2μm长大至8.5μm,稀土相由点状弥散分布在α-Mg晶体内转变为连续或较小间距的分布在晶界处,形状为碟状或片状、针状,整体分布均匀;T5时效处理后WE43合金的屈服强度、抗拉强度和伸长率相对于LPBF态分别下降了12.6%、10.7%和6.6%,其力学性能降低的原因可归因于以下3个方面:时效后合金的晶粒尺寸增大;时效后连续或较小间距分布于晶界处的脆性析出相破坏了晶界的连续性,以及微孔等缺陷依然存在;时效后稀土元素从α-Mg基体中析出,导致其在α-Mg基体中的固溶度降低;但稀土原子在α-Mg中的固溶度对LPBF制备的WE43合金塑性的影响程度相对较低。展开更多
文摘目的探讨慢性阻塞性肺疾病(COPD)患者血清G蛋白偶联受体43(GPR43)、甲基转移酶3(METTL3)水平表达与肺功能和气流受限程度的相关性。方法选取2019年1月~2024年5月成都市第六人民医院收治的COPD患者150例(COPD组)和同期健康体检志愿者150例(对照组)。根据气流受限程度将COPD患者分为轻度组(n=61)、中度组(n=46)和重度/极重度组(n=43)。检测血清GPR43、METTL3水平并测定肺功能[第1秒用力呼气容积(FEV1)/用力肺活量(FVC)、FEV1占预计值%(%pred)]。Spearman相关性分析血清GPR43、METTL3水平与肺功能指标的相关性;通过多元有序Logistic回归分析血清GPR43、METTL3水平与COPD患者气流受限程度的关系,使用受试者工作特征(ROC)曲线分析其评估效能。结果与对照组比较,COPD组血清GPR43水平(5.32±1.07ng/ml vs 7.61±1.59ng/ml),FEV1/FVC比值[54.17(43.77,63.60)%vs 80.78(76.24,88.22)%]和FEV1%pred[72.25(44.94,84.22)%vs 93.06(89.71、95.54)%]显著降低(t/Z=-14.591,-14.247,-14.108),而METTL3水平(41.73±5.27pg/ml vs 31.85±5.03pg/ml)显著升高(t=16.614),差异具有统计学意义(均P<0.001)。重度/极重度组血清GPR43水平低于轻度、中度组(4.57±0.77ng/ml vs 5.98±1.05ng/ml、5.16±0.79 ng/ml),中度组低于轻度组(t=7.474、3.598、4.391),重度/极重度组血清METTL3水平高于轻度组、中度组(45.76±5.24pg/ml vs 38.83±4.20pg/ml、41.82±4.00pg/ml),中度组高于轻度组(t=-7.474、-4.003、-3.722),差异具有统计学意义(均P<0.001)。COPD患者FEV1/FVC比值、FEV1%pred与血清GPR43水平呈正相关(r=0.762、0.768,均P<0.001),与METTL3水平呈负相关(r=-0.758、-0.778,均P<0.001)。GPR43为COPD气流受限的独立保护因素(OR=0.689,Waldχ^(2)=14.064,P<0.05),METTL3为独立危险因素(OR=1.251,Waldχ^(2)=4.500,P<0.05)。血清GPR43与METTL3联合评估COPD重度/极重度气流受限的曲线下面积(AUC)优于GPR43和METTL3单独检测,差异具有统计学意义(Z=3.231、3.374,均P<0.05)。结论COPD患者血清GPR43水平降低、METTL3水平升高,与肺功能降低和气流受限程度加重有关,血清GPR43,METTL3水平联合评估COPD患者重度/极重度气流受限的价值较高。
基金Funded by the Fundamental Research Program of Shanxi Province(No.202203021211191)。
文摘To investigate the effects of extrusion temperature on the microstructure and mechanical properties of WE43 magnesium alloy,extrusion experiments were conducted under 330,380,430,and 450℃,and the extrusion ratio was 16.The experimental results indicate that,at a low temperature of 330℃,the alloy precipitates a large amount of second phases rich in Zr elements.Moreover,the texture strength and kernel average misorientation value are the highest,with values of 27.77 and 0.71,respectively.The increase in extrusion temperature leads to a gradual decrease in texture strength and kernel average misorientation value.The strength of the alloy is the highest at an extrusion temperature of 330℃.Its tensile yield stress is 254.7 MPa and ultimate tensile strength is 302.7 MPa,respectively.As the extrusion temperature increases,the strength of the alloy gradually decreases.At an extrusion temperature of 450℃,the tensile yield stress is 181.3 MPa and ultimate tensile strength is 265.7 MPa,respectively.The elongation first increases and then decreases,with an elongation of 20.9%at an extrusion temperature of 330℃.At an extrusion temperature of 430℃,the elongation reaches its maximum value,which is 23.6%.At an extrusion temperature of 450℃,the elongation reaches its lowest value,which is 16.4%.
文摘Amyotrophic lateral sclerosis is a devastating neurodegenerative disease marked by progressive motor neuron degeneration.Despite extensive research,effective treatments remain elusive,underscoring the need to explore the molecular mechanisms driving disease progression.The amyotrophic lateral sclerosis complexity is further compounded by its large heterogeneity,encompassing both genetic and sporadic forms,diverse phenotypic presentations,and highly variable progression rates.A key pathological feature of amyotrophic lateral sclerosis is the aggregation of TAR DNA-binding protein 43,which contributes to cellular toxicity,neuroinflammation,and neuronal dysfunction.This review explores the complex interplay between TAR DNA-binding protein 43 pathology,immunity dysregulation,and the gut-brain axis,with a focus on the role of microbiome-derived metabolites in amyotrophic lateral sclerosis.Neuroinflammation,mediated by both innate and adaptive immunity,plays a central role in disease pathogenesis,with TAR DNA-binding protein 43 influencing immune signaling and exacerbating neurotoxicity.Additionally,disruptions in gut microbiota composition and intestinal barrier integrity,frequently observed in amyotrophic lateral sclerosis patients,suggest a potential role for the gut-brain axis in modulating neurodegenerative processes.By integrating evidence from emerging studies,our aim is to clarify how TAR DNA-binding protein 43 aggregation contributes to neuroinflammation and immune dysfunction while exploring the gut microbiota role as both a modulator and potential biomarker of disease.Understanding these interactions could pave the way for novel therapeutic strategies,including microbiome-targeted interventions such as probiotics,dietary modifications,or immune-modulating therapies.Finally,unraveling the TAR DNA-binding protein 43-immune system-microbiome axis may offer new avenues for personalized treatments aimed at mitigating neuroinflammation,slowing amyotrophic lateral sclerosis progression,and improving patient outcomes and life quality.
文摘由于稀土(RE)元素在激光粉末床熔融(Laser powder bed fusion,LPBF)制备的WE43合金中具有超高的固溶度,因此本文省去固溶处理过程,直接对其进行T5时效处理,研究了T5时效处理对其微观组织、物相、缺陷以及拉伸性能的影响。结果表明:T5时效处理后,WE43合金中的椭圆形和鱼鳞纹组织消失,平均晶粒尺寸由2μm长大至8.5μm,稀土相由点状弥散分布在α-Mg晶体内转变为连续或较小间距的分布在晶界处,形状为碟状或片状、针状,整体分布均匀;T5时效处理后WE43合金的屈服强度、抗拉强度和伸长率相对于LPBF态分别下降了12.6%、10.7%和6.6%,其力学性能降低的原因可归因于以下3个方面:时效后合金的晶粒尺寸增大;时效后连续或较小间距分布于晶界处的脆性析出相破坏了晶界的连续性,以及微孔等缺陷依然存在;时效后稀土元素从α-Mg基体中析出,导致其在α-Mg基体中的固溶度降低;但稀土原子在α-Mg中的固溶度对LPBF制备的WE43合金塑性的影响程度相对较低。
