Immobilized thrombin on X-ray radiopaque polyvinyl alcohol/chitosan embolic microspheres for precise localization and topical blood coagulation  

作　　者：Xiaohong Li Xiongfa Ji Kun Chen Muhammad Wajid Ullah Basen Li Jiameng Cao Lin Xiao Jun Xiao Guang Yang 

机构地区：[1]Department of Biomedical Engineering,College of Life Science and Technology,Huazhong University of Science and Technology,Wuhan,430074,China [2]Department of Orthopedics,Guangdong Provincial People’s Hospital,Guangdong Academy of Medical Sciences,Guangzhou,510080,China [3]Department of Radiology,Tongji Hospital,Tongji Medical College,Huazhong University of Science and Technology,Wuhan,430030,China [4]School of Biomedical Engineering,Sun Yat-sen University,Guangzhou,510006,China [5]Department of Orthopaedics,Tongji Hospital,Tongji Medical College,Huazhong University of Science and Technology,Wuhan,430030,China

出　　处：《Bioactive Materials》2021年第7期2105-2119,共15页生物活性材料（英文）

基　　金：This work was financially supported by the National Natural Science Foundation of China(51803067,21774039,51973076);National Key Research and Development Program of China(2018YFE0123700).

摘　　要：Trans-catheter arterial embolization(TAE)plays an important role in treating various diseases.The available embolic agents lack X-ray visibility and do not prevent the reflux phenomenon,thus hindering their application for TAE therapy.Herein,we aim to develop a multifunctional embolic agent that combines the X-ray radiopacity with local procoagulant activity.The barium sulfate nanoparticles(BaSO4 NPs)were synthesized and loaded into the polyvinyl alcohol/chitosan(PVA/CS)to prepare the radiopaque BaSO4/PVA/CS microspheres(MS).Thereafter,thrombin was immobilized onto the BaSO4/PVA/CS MS to obtain the thrombin@BaSO4/PVA/CS MS.The prepared BaSO4/PVA/CS MS were highly spherical with diameters ranging from 100 to 300μm.In vitro CT imaging showed increased X-ray visibility of BaSO4/PVA/CS MS with the increased content of BaSO4 NPs in the PVA/CS MS.The biocompatibility assessments demonstrated that the MS were non-cytotoxic and possessed permissible hemolysis rate.The biofunctionalized thrombin@BaSO4/PVA/CS MS showed improved hemostatic capacity and facilitated hemostasis in vitro.Additionally,in vivo study performed on a rabbit ear embolization model confirmed the excellent X-ray radiopaque stability of the BaSO4/PVA/CS MS.Moreover,both the BaSO4/PVA/CS and thrombin@BaSO4/PVA/CS MS achieved superior embolization effects with progressive ischemic necrosis on the ear tissue and induced prominent ultrastructural changes in the endothelial cells.The findings of this study suggest that the developed MS could act as a radiopaque and hemostatic embolic agent to improve the embolization efficiency.

关 键 词：BaSO_(4) Polyvinyl alcohol/chitosan RADIOPACITY THROMBIN Coagulation EMBOLIZATION 

分 类 号：R318[医药卫生—生物医学工程]