In acute ischemic stroke therapy,potent neuroprotective agents are needed that prevent neural injuries caused by reactive oxygen species(ROS)during ischemic reperfusion.Herein,a novel 2D neuroprotective agent(AFGd-LDH...In acute ischemic stroke therapy,potent neuroprotective agents are needed that prevent neural injuries caused by reactive oxygen species(ROS)during ischemic reperfusion.Herein,a novel 2D neuroprotective agent(AFGd-LDH)is reported,comprising Gd-containing layered double hydroxide nanosheets(Gd-LDH,as a drug nanocarrier/MRI contrast agent),atorvastatin(ATO,as a neuroprotective drug)and the ferritin heavy subunit(FTH,as a blood brain barrier transport agent).Experiments revealed AFGd-LDH to possess outstanding antioxidant activity,neuroprotective properties,blood‒brain barrier transit properties,and biocompatibility.In vitro studies demonstrated the ROS scavenging efficiency of AFGd‒LDH to be~90%,surpassing CeO_(2)(50%,a ROS scavenger)and edaravone(52%,a clinical neuroprotective drug).Ischemia‒reperfusion model studies in mice showed AFGd‒LDH could dramatically decrease apoptosis induced by reperfusion,reducing the infarct area by 67%and lowering the neurological deficit score from 3.2 to 0.9.AFGd-LDH also offered outstanding MRI performance,thus enabling simultaneous imaging and ischemia reperfusion therapy.展开更多
Background and purpose Previous studies have reported about inflammation processes(IPs)that play important roles in aneurysm formation and rupture,which could be driven by blood flow.IPs can be identified using aneury...Background and purpose Previous studies have reported about inflammation processes(IPs)that play important roles in aneurysm formation and rupture,which could be driven by blood flow.IPs can be identified using aneurysmal wall enhancement(AWE)on high-resolution black-blood MRI(BB-MRI)and blood flow haemodynamics can be demonstrated by four-dimensional-flow MRI(4D-flow MRI).Thus,this study investigated the associations between AWE and haemodynamics in unruptured intracranial aneurysms(IA)by combining 4D-flow MRI and high-resolution BB-MRI.Materials and methods Between April 2014 and October 2017,48 patients with 49 unruptured IA who underwent both 4D-flow MRI and high-resolution BB-MRI were retrospectively included in this study.The haemodynamic parameters demonstrated using 4D-flow MRI were compared between different AWE patterns using the Kruskal-Wallis test and ordinal regression.Results The results of Kruskal-Wallis test showed that the average wall shear stress in the IA(WSSavg-IA),maximum through-plane velocity in the adjacent parent artery,inflow jet patterns and the average vorticity in IA(vorticityavg-IA)were significantly associated with the AWE patterns.Ordinal regression analysis identified WSSavg-IA(p=0.002)and vorticityavg-IA(p=0.033)as independent predictors of AWE patterns.Conclusion A low WSS and low average vorticity were independently associated with a high AWE grade for IAs larger than 4 mm.Therefore,WSS and average vorticity could predict AWE and circumferential AWE.展开更多
基金support from National Natural Science Foundation of China(7172070,81771233,21805293,U20A20254,52072253)the Youth Innovation Promotion Association of Chinese Academy of Sciences(No.2019027)+2 种基金the Director Foundation of the Technical Institute of Physics and Chemistry,Chinese Academy of SciencesBeijing Science and Technology Plan subject:Beijing‒Tianjin‒Hebei collaborative innovation promotion project(No.Z181100009618035)National Key Research and Development Program(2018YFC1311602,2018YFC1312801,2016YF1301500).
文摘In acute ischemic stroke therapy,potent neuroprotective agents are needed that prevent neural injuries caused by reactive oxygen species(ROS)during ischemic reperfusion.Herein,a novel 2D neuroprotective agent(AFGd-LDH)is reported,comprising Gd-containing layered double hydroxide nanosheets(Gd-LDH,as a drug nanocarrier/MRI contrast agent),atorvastatin(ATO,as a neuroprotective drug)and the ferritin heavy subunit(FTH,as a blood brain barrier transport agent).Experiments revealed AFGd-LDH to possess outstanding antioxidant activity,neuroprotective properties,blood‒brain barrier transit properties,and biocompatibility.In vitro studies demonstrated the ROS scavenging efficiency of AFGd‒LDH to be~90%,surpassing CeO_(2)(50%,a ROS scavenger)and edaravone(52%,a clinical neuroprotective drug).Ischemia‒reperfusion model studies in mice showed AFGd‒LDH could dramatically decrease apoptosis induced by reperfusion,reducing the infarct area by 67%and lowering the neurological deficit score from 3.2 to 0.9.AFGd-LDH also offered outstanding MRI performance,thus enabling simultaneous imaging and ischemia reperfusion therapy.
基金supported by the Natural Science Foundation of China(number 81971604)the Natural Science Foundation of China(number 81771233)+3 种基金the Natural Science Foundation of Beijing(number L192013)the Natural Science Foundation of China(number 81901197)Specific Research Projects for Capital Health Development(2018-2-2041)Beijing Science and Technology Planning Project:Beijing-Tianjin-Hebei Collaborative Innovation Promotion Project(Z181100009618035).
文摘Background and purpose Previous studies have reported about inflammation processes(IPs)that play important roles in aneurysm formation and rupture,which could be driven by blood flow.IPs can be identified using aneurysmal wall enhancement(AWE)on high-resolution black-blood MRI(BB-MRI)and blood flow haemodynamics can be demonstrated by four-dimensional-flow MRI(4D-flow MRI).Thus,this study investigated the associations between AWE and haemodynamics in unruptured intracranial aneurysms(IA)by combining 4D-flow MRI and high-resolution BB-MRI.Materials and methods Between April 2014 and October 2017,48 patients with 49 unruptured IA who underwent both 4D-flow MRI and high-resolution BB-MRI were retrospectively included in this study.The haemodynamic parameters demonstrated using 4D-flow MRI were compared between different AWE patterns using the Kruskal-Wallis test and ordinal regression.Results The results of Kruskal-Wallis test showed that the average wall shear stress in the IA(WSSavg-IA),maximum through-plane velocity in the adjacent parent artery,inflow jet patterns and the average vorticity in IA(vorticityavg-IA)were significantly associated with the AWE patterns.Ordinal regression analysis identified WSSavg-IA(p=0.002)and vorticityavg-IA(p=0.033)as independent predictors of AWE patterns.Conclusion A low WSS and low average vorticity were independently associated with a high AWE grade for IAs larger than 4 mm.Therefore,WSS and average vorticity could predict AWE and circumferential AWE.