目的探讨血清微小RNA(miRNA)-106a和miRNA-20a水平与新生儿呼吸窘迫综合征(NRDS)严重程度及预后的相关性。方法选取2021年3月至2024年4月在西安交通大学附属红会医院就诊的156例NRDS患儿为NRDS组,其中男77例,女79例,出生胎龄(33.87±...目的探讨血清微小RNA(miRNA)-106a和miRNA-20a水平与新生儿呼吸窘迫综合征(NRDS)严重程度及预后的相关性。方法选取2021年3月至2024年4月在西安交通大学附属红会医院就诊的156例NRDS患儿为NRDS组,其中男77例,女79例,出生胎龄(33.87±2.01)周。根据NRDS患儿胸部影像检查结果将其分为轻度组(50例)、中度组(74例)和重度组(32例)。根据NRDS患儿结局将其分为预后良好组132例和预后不良组24例。另选取同期在西安交通大学附属红会医院体检的健康早产儿150例作为对照组,其中男77例,女73例,出生胎龄(34.05±1.83)周。采用定量聚合酶链式反应(qPCR)测定血清miRNA-106a和miRNA-20a水平;采用Pearson相关分析NRDS患儿血清miRNA-106a和miRNA-20a水平与新生儿急性生理评分(SNAPPE-Ⅱ)、1 min Apgar评分的相关性;采用受试者操作特征曲线(ROC)评价血清miRNA-106a和miRNA-20a水平预测NRDS患儿预后的价值。采用t检验、χ^(2)检验。结果NRDS组患儿血清miRNA-106a和miRNA-20a水平低于对照组[(0.97±0.30)比(1.70±0.53)、(0.88±0.32)比(1.57±0.55)],差异均有统计学意义(t=14.750、13.346,均P<0.05)。重度组、中度组、轻度组血清miRNA-106a和miRNA-20a水平及1 min Apgar评分比较,差异均有统计学意义(均P<0.05)。预后不良组NRDS患儿血清miRNA-106a和miRNA-20a水平低于预后良好组[(0.40±0.19)比(1.07±0.36)、(0.39±0.17)比(0.97±0.34)],SNAPPE-Ⅱ评分高于预后良好组[(34.25±6.50)分比(18.10±3.58)分],差异均有统计学意义(t=13.438、12.718、11.850,均P<0.05)。血清miRNA-106a和miRNA-20a水平与SNAPPE-Ⅱ评分呈负相关(均P<0.05),与1 min Apgar评分呈正相关(均P<0.05)。miRNA-106a、miRNA-20a预测NRDS患儿预后不良的灵敏度分别为95.8%、91.7%,特异度分别为93.2%、89.4%,曲线下面积(AUC)分别为0.961(95%CI 0.929~0.992)、0.938(95%CI 0.900~0.976),表明这些生物标志物预测NRDS患儿预后准确度较高。miRNA-106a联合miRNA-20a的灵敏度和特异度分别为91.7%、97.7%,AUC为0.984(95%CI 0.967~1.000),表明联合检测具有更高的预测效能。结论血清miRNA-106a和miRNA-20a水平在NRDS患儿中降低,且其水平随NRDS患儿严重程度加重而逐渐降低,二者在预测NRDS患儿预后中具有重要价值。展开更多
基于试验数据,利用扩展有限元方法(extended finite element method,XFEM)和内聚力模型(cohesive zone model,CZM),对20Cr2Ni3钢顶头表面氧化膜的断裂行为进行了数值分析,研究了氧化膜受力方向和孔洞对裂纹生长行为的影响。结果表明:氧...基于试验数据,利用扩展有限元方法(extended finite element method,XFEM)和内聚力模型(cohesive zone model,CZM),对20Cr2Ni3钢顶头表面氧化膜的断裂行为进行了数值分析,研究了氧化膜受力方向和孔洞对裂纹生长行为的影响。结果表明:氧化膜受力方向影响裂纹扩展路径,外层氧化膜裂纹尖端的J积分和应力强度因子K_I随着θ角(受力方向与氧化膜的夹角)的增大而减小,当θ角增大到90°时裂纹停止生长;外层氧化膜上孔洞使得裂纹尖端的J积分和应力强度因子K_I减小。同时,孔洞的存在使得外力传递到内层氧化膜时产生应力集中和偏移,导致内层裂纹受力不均,减小了受力方向对内层裂纹生长的影响。展开更多
Traumatic brain injury is a severe health problem leading to autophagy and apoptosis in the brain.3,6-Dibromo-beta-fluoro-N-(3-methoxyphenyl)-9H-carbazole-9-propanamine(P7C3-A20)can be neuroprotective in various disea...Traumatic brain injury is a severe health problem leading to autophagy and apoptosis in the brain.3,6-Dibromo-beta-fluoro-N-(3-methoxyphenyl)-9H-carbazole-9-propanamine(P7C3-A20)can be neuroprotective in various diseases,including ischemic stroke and neurodegenerative diseases.However,whether P7C3-A20 has a therapeutic effect on traumatic brain injury and its possible molecular mechanisms are unclear.Therefore,in the present study,we investigated the therapeutic effects of P7C3-A20 on traumatic brain injury and explored the putative underlying molecular mechanisms.We established a traumatic brain injury rat model using a modified weight drop method.P7C3-A20 or vehicle was injected intraperitoneally after traumatic brain injury.Severe neurological deficits were found in rats after traumatic brain injury,with deterioration in balance,walking function,and learning memory.Furthermore,hematoxylin and eosin staining showed significant neuronal cell damage,while terminal deoxynucleotidyl transferase mediated dUTP nick end labeling staining indicated a high rate of apoptosis.The presence of autolysosomes was observed using transmission electron microscope.P7C3-A20 treatment reversed these pathological features.Western blotting showed that P7C3-A20 treatment reduced microtubule-associated protein 1 light chain 3-Ⅱ(LC3-Ⅱ)autophagy protein,apoptosis-related proteins(namely,Bcl-2/adenovirus E1B 19-kDa-interacting protein 3[BNIP3],and Bcl-2 associated x protein[Bax]),and elevated ubiquitin-binding protein p62(p62)autophagy protein expression.Thus,P7C3-A20 can treat traumatic brain injury in rats by inhibiting excessive autophagy and apoptosis.展开更多
文摘目的探讨血清微小RNA(miRNA)-106a和miRNA-20a水平与新生儿呼吸窘迫综合征(NRDS)严重程度及预后的相关性。方法选取2021年3月至2024年4月在西安交通大学附属红会医院就诊的156例NRDS患儿为NRDS组,其中男77例,女79例,出生胎龄(33.87±2.01)周。根据NRDS患儿胸部影像检查结果将其分为轻度组(50例)、中度组(74例)和重度组(32例)。根据NRDS患儿结局将其分为预后良好组132例和预后不良组24例。另选取同期在西安交通大学附属红会医院体检的健康早产儿150例作为对照组,其中男77例,女73例,出生胎龄(34.05±1.83)周。采用定量聚合酶链式反应(qPCR)测定血清miRNA-106a和miRNA-20a水平;采用Pearson相关分析NRDS患儿血清miRNA-106a和miRNA-20a水平与新生儿急性生理评分(SNAPPE-Ⅱ)、1 min Apgar评分的相关性;采用受试者操作特征曲线(ROC)评价血清miRNA-106a和miRNA-20a水平预测NRDS患儿预后的价值。采用t检验、χ^(2)检验。结果NRDS组患儿血清miRNA-106a和miRNA-20a水平低于对照组[(0.97±0.30)比(1.70±0.53)、(0.88±0.32)比(1.57±0.55)],差异均有统计学意义(t=14.750、13.346,均P<0.05)。重度组、中度组、轻度组血清miRNA-106a和miRNA-20a水平及1 min Apgar评分比较,差异均有统计学意义(均P<0.05)。预后不良组NRDS患儿血清miRNA-106a和miRNA-20a水平低于预后良好组[(0.40±0.19)比(1.07±0.36)、(0.39±0.17)比(0.97±0.34)],SNAPPE-Ⅱ评分高于预后良好组[(34.25±6.50)分比(18.10±3.58)分],差异均有统计学意义(t=13.438、12.718、11.850,均P<0.05)。血清miRNA-106a和miRNA-20a水平与SNAPPE-Ⅱ评分呈负相关(均P<0.05),与1 min Apgar评分呈正相关(均P<0.05)。miRNA-106a、miRNA-20a预测NRDS患儿预后不良的灵敏度分别为95.8%、91.7%,特异度分别为93.2%、89.4%,曲线下面积(AUC)分别为0.961(95%CI 0.929~0.992)、0.938(95%CI 0.900~0.976),表明这些生物标志物预测NRDS患儿预后准确度较高。miRNA-106a联合miRNA-20a的灵敏度和特异度分别为91.7%、97.7%,AUC为0.984(95%CI 0.967~1.000),表明联合检测具有更高的预测效能。结论血清miRNA-106a和miRNA-20a水平在NRDS患儿中降低,且其水平随NRDS患儿严重程度加重而逐渐降低,二者在预测NRDS患儿预后中具有重要价值。
文摘基于试验数据,利用扩展有限元方法(extended finite element method,XFEM)和内聚力模型(cohesive zone model,CZM),对20Cr2Ni3钢顶头表面氧化膜的断裂行为进行了数值分析,研究了氧化膜受力方向和孔洞对裂纹生长行为的影响。结果表明:氧化膜受力方向影响裂纹扩展路径,外层氧化膜裂纹尖端的J积分和应力强度因子K_I随着θ角(受力方向与氧化膜的夹角)的增大而减小,当θ角增大到90°时裂纹停止生长;外层氧化膜上孔洞使得裂纹尖端的J积分和应力强度因子K_I减小。同时,孔洞的存在使得外力传递到内层氧化膜时产生应力集中和偏移,导致内层裂纹受力不均,减小了受力方向对内层裂纹生长的影响。
基金supported by National Natural Science Foundation of China,No.32102745(to XL).
文摘Traumatic brain injury is a severe health problem leading to autophagy and apoptosis in the brain.3,6-Dibromo-beta-fluoro-N-(3-methoxyphenyl)-9H-carbazole-9-propanamine(P7C3-A20)can be neuroprotective in various diseases,including ischemic stroke and neurodegenerative diseases.However,whether P7C3-A20 has a therapeutic effect on traumatic brain injury and its possible molecular mechanisms are unclear.Therefore,in the present study,we investigated the therapeutic effects of P7C3-A20 on traumatic brain injury and explored the putative underlying molecular mechanisms.We established a traumatic brain injury rat model using a modified weight drop method.P7C3-A20 or vehicle was injected intraperitoneally after traumatic brain injury.Severe neurological deficits were found in rats after traumatic brain injury,with deterioration in balance,walking function,and learning memory.Furthermore,hematoxylin and eosin staining showed significant neuronal cell damage,while terminal deoxynucleotidyl transferase mediated dUTP nick end labeling staining indicated a high rate of apoptosis.The presence of autolysosomes was observed using transmission electron microscope.P7C3-A20 treatment reversed these pathological features.Western blotting showed that P7C3-A20 treatment reduced microtubule-associated protein 1 light chain 3-Ⅱ(LC3-Ⅱ)autophagy protein,apoptosis-related proteins(namely,Bcl-2/adenovirus E1B 19-kDa-interacting protein 3[BNIP3],and Bcl-2 associated x protein[Bax]),and elevated ubiquitin-binding protein p62(p62)autophagy protein expression.Thus,P7C3-A20 can treat traumatic brain injury in rats by inhibiting excessive autophagy and apoptosis.
