目的探讨牙龈卟啉单胞菌(Porphyromonas gingivalis,P.gingivalis)的代谢产物通过激活炎症小体(NOD-,LRR-and pyrin domain-containing protein 3,NLRP3)促进神经炎症反应的作用及机制。方法使用P.gingivalis上清处理小胶质细胞HMC3,采...目的探讨牙龈卟啉单胞菌(Porphyromonas gingivalis,P.gingivalis)的代谢产物通过激活炎症小体(NOD-,LRR-and pyrin domain-containing protein 3,NLRP3)促进神经炎症反应的作用及机制。方法使用P.gingivalis上清处理小胶质细胞HMC3,采用CCK8、实时荧光定量PCR、Western Blot等方法分别检测P.gingivalis上清对小胶质细胞HMC3的细胞活力、细胞NLRP3信号通路激活以及线粒体功能验证。结果P.gingivalis上清在5%时,显著激活小胶质细胞HMC3的NLRP3,增加相关凋亡相关斑点样蛋白(apoptosis-associated spotlike protein containing a CARD,ASC)、胱天蛋白酶1(Caspase1)、炎症因子(IL-1β)(P<0.05);且线粒体功能相关蛋白表达和线粒体膜电位降低。加入NLRP3的抑制剂(MCC950)后,10nM MCC950显著增强细胞活力,抑制相关胱天蛋白酶1(Caspase1)、凋亡相关斑点样蛋白(ASC)、炎症因子(IL-1β)(P<0.05)的表达;同时恢复了线粒体功能。结论P.gingivalis通过激活NLRP3促进小胶质细胞炎症反应发生,其机制可能与线粒体功能有关。展开更多
Failures due to high-cycle fatigue have led to a high cost in aerospace engineering over the past few decades.In this paper,the experimental results of the fatigue behavior of compressor blade specimen subjected to re...Failures due to high-cycle fatigue have led to a high cost in aerospace engineering over the past few decades.In this paper,the experimental results of the fatigue behavior of compressor blade specimen subjected to resonance and the effects of a damping hard coating on relieving the fatigue progress are presented.The crack initiation and propagation processes were observed under resonance of the first bending mode by using the resonant frequencies as the indicator.Significant nonlinear features were observed in the spectrum of the blade with a fatigue crack.The finite element model considering the breathing crack was established with nonlinear contact based on the crack localization and size,which was obtained by ultrasonic phased array technology.The simulation results of the vibration behavior of the cracked blade were obtained and consistent with the experimental results.A NiCrAlY coating was deposited on the blade,and increases in the fatigue life were observed under the same condition.The results of this paper can help to better understand the fatigue of a compressor blade subjected to resonance and provide a preference for the application of a damping hard coating on compressor blades.展开更多
文摘目的探讨牙龈卟啉单胞菌(Porphyromonas gingivalis,P.gingivalis)的代谢产物通过激活炎症小体(NOD-,LRR-and pyrin domain-containing protein 3,NLRP3)促进神经炎症反应的作用及机制。方法使用P.gingivalis上清处理小胶质细胞HMC3,采用CCK8、实时荧光定量PCR、Western Blot等方法分别检测P.gingivalis上清对小胶质细胞HMC3的细胞活力、细胞NLRP3信号通路激活以及线粒体功能验证。结果P.gingivalis上清在5%时,显著激活小胶质细胞HMC3的NLRP3,增加相关凋亡相关斑点样蛋白(apoptosis-associated spotlike protein containing a CARD,ASC)、胱天蛋白酶1(Caspase1)、炎症因子(IL-1β)(P<0.05);且线粒体功能相关蛋白表达和线粒体膜电位降低。加入NLRP3的抑制剂(MCC950)后,10nM MCC950显著增强细胞活力,抑制相关胱天蛋白酶1(Caspase1)、凋亡相关斑点样蛋白(ASC)、炎症因子(IL-1β)(P<0.05)的表达;同时恢复了线粒体功能。结论P.gingivalis通过激活NLRP3促进小胶质细胞炎症反应发生,其机制可能与线粒体功能有关。
基金Project(DUT20RC(3)014)supported by the Fundamental Research Funds for the Central Universities,China,Project(VCAME201801)supported by Key Laboratory of Vibration and Control of Aero-Propulsion System(Ministry of Education),ChinaProject(11472068)supported by the National Natural Science Foundation of China。
文摘Failures due to high-cycle fatigue have led to a high cost in aerospace engineering over the past few decades.In this paper,the experimental results of the fatigue behavior of compressor blade specimen subjected to resonance and the effects of a damping hard coating on relieving the fatigue progress are presented.The crack initiation and propagation processes were observed under resonance of the first bending mode by using the resonant frequencies as the indicator.Significant nonlinear features were observed in the spectrum of the blade with a fatigue crack.The finite element model considering the breathing crack was established with nonlinear contact based on the crack localization and size,which was obtained by ultrasonic phased array technology.The simulation results of the vibration behavior of the cracked blade were obtained and consistent with the experimental results.A NiCrAlY coating was deposited on the blade,and increases in the fatigue life were observed under the same condition.The results of this paper can help to better understand the fatigue of a compressor blade subjected to resonance and provide a preference for the application of a damping hard coating on compressor blades.