It is urgently demanded to develop biomaterials with balanced hemostatic/antibacterial ability and facile preparation methods.In this work,cationic starch microparticles(MSQP),prepared by the facile grafting of microp...It is urgently demanded to develop biomaterials with balanced hemostatic/antibacterial ability and facile preparation methods.In this work,cationic starch microparticles(MSQP),prepared by the facile grafting of microporous starch particles(MS)with tunable quaternized polyethyleneimine,were readily constructed as promising hemostatic materials for integrated antibacterial and hemostatic performance.The cationic grafts not only endowed MSQP with good antibacterial ability,but also benefited from biocompatible MS to achieve favorable biocompatibility.Moreover,in vitro results confirmed the superior hemostatic property of MSQP2(with the medium content of cationic grafts)among three MSQP and pristine MS.After investigating the bloodmaterial interactions of MSQP/MS,the procoagulant mechanism of MSQP2 was revealed that the optimal amount of cationic grafts achieves highly balanced plasma-protein adhesion,platelet adhesion and blood coagulation system.In vivo artery-injury model further demonstrated the superior hemostatic performance of MSQP2 for potential severe hemorrhage.This work sheds light on the design of cationic polymer-based biomaterials for balanced antibacterial and hemostatic functions.展开更多
Immunotherapy brings new hope for tumor treatment by inducing immunogenic cell death(ICD)of tumor cells.However,insufficient immunogenicity and low immune response rate greatly limit antitumor immunity.Herein,by optim...Immunotherapy brings new hope for tumor treatment by inducing immunogenic cell death(ICD)of tumor cells.However,insufficient immunogenicity and low immune response rate greatly limit antitumor immunity.Herein,by optimizing the composition and morphology,the rational design of Janus nanoparticles composed of Fe_(3)O_(4) nanospheres and SiO_(2)nanorods was realized for enhanced cancer immunotherapy through amplified ICD.After glucose oxidase(GOx)was loaded by the Janus nanoparticles,the resultant M-FS-GOx consumes glucose at tumor sites to generate gluconic acid and hydrogen peroxide(H_(2)O_(2))for starvation therapy while the H_(2)O_(2)supply promotes the production of highly toxic·OH to achieve effective chemodynamic therapy(CDT).Under a 1064 nm light irradiation,the photothermal effect of M-FS-GOx enhances the enzyme activity of GOx for improved starvation therapy.Furthermore,both tumor-associated antigens released during the process of ICD and the intrinsic immunoadjuvant property of M-FS-GOx stimulate dendritic cell maturation to activate antitumor immune responses.This work provides a promising strategy for the construction of Janus nanoparticles to achieve enhanced cancer immunotherapy through combination therapy-amplified ICD.展开更多
Metal-organic frameworks(MOFs)composed of functional metal ions/clusters and suitable bridging ligands are highly designable,which have shown excellent catalytic activity as nanozymes and are promising for antibacteri...Metal-organic frameworks(MOFs)composed of functional metal ions/clusters and suitable bridging ligands are highly designable,which have shown excellent catalytic activity as nanozymes and are promising for antibacterial therapy.Herein,twodimensional(2D)copper MOF nanosheets(Cu-MOF NSs)as effective antibacterial agents were prepared through a simple onestep method.The 2D Cu-MOF NSs displayed a peroxidase-like activity toward H_(2)O_(2)decomposition into highly cytotoxic hydroxyl radicals(·OH).Notably,the 2D morphology of Cu-MOF NSs provides a high density of Cu^(2+)/Cu^(+)surface active sites,which could efficiently oxidize the proteins and lipids on the bacterial surface and induce the death of bacteria.It is found that the as-prepared 2D Cu-MOF NSs exhibited antibacterial properties against Staphylococcus aureus(S.aureus)and could efficiently eradicate the biofilm of S.aureus.Up to 99.9%bacteria were killed at a Cu-MOF concentration of 4μg/m L.This study opens a new avenue for the design of MOF-based antibacterial agents to combat pathogenic bacterial infections.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.52173114,52221006,and 82202452)Beijing Outstanding Young Scientist Program(Grant No.BJJWZYJH012019100-10024).
文摘It is urgently demanded to develop biomaterials with balanced hemostatic/antibacterial ability and facile preparation methods.In this work,cationic starch microparticles(MSQP),prepared by the facile grafting of microporous starch particles(MS)with tunable quaternized polyethyleneimine,were readily constructed as promising hemostatic materials for integrated antibacterial and hemostatic performance.The cationic grafts not only endowed MSQP with good antibacterial ability,but also benefited from biocompatible MS to achieve favorable biocompatibility.Moreover,in vitro results confirmed the superior hemostatic property of MSQP2(with the medium content of cationic grafts)among three MSQP and pristine MS.After investigating the bloodmaterial interactions of MSQP/MS,the procoagulant mechanism of MSQP2 was revealed that the optimal amount of cationic grafts achieves highly balanced plasma-protein adhesion,platelet adhesion and blood coagulation system.In vivo artery-injury model further demonstrated the superior hemostatic performance of MSQP2 for potential severe hemorrhage.This work sheds light on the design of cationic polymer-based biomaterials for balanced antibacterial and hemostatic functions.
基金This work was supported by the National Natural Science Foundation of China(Grant Nos.52173271,52221006,and 51922022)Beijing Outstanding Young Scientist Program(Grant No.BJJWZYJH0120191001-0024)the Fundamental Research Funds for the Central Universities(Grant No.BHYC1705A).
文摘Immunotherapy brings new hope for tumor treatment by inducing immunogenic cell death(ICD)of tumor cells.However,insufficient immunogenicity and low immune response rate greatly limit antitumor immunity.Herein,by optimizing the composition and morphology,the rational design of Janus nanoparticles composed of Fe_(3)O_(4) nanospheres and SiO_(2)nanorods was realized for enhanced cancer immunotherapy through amplified ICD.After glucose oxidase(GOx)was loaded by the Janus nanoparticles,the resultant M-FS-GOx consumes glucose at tumor sites to generate gluconic acid and hydrogen peroxide(H_(2)O_(2))for starvation therapy while the H_(2)O_(2)supply promotes the production of highly toxic·OH to achieve effective chemodynamic therapy(CDT).Under a 1064 nm light irradiation,the photothermal effect of M-FS-GOx enhances the enzyme activity of GOx for improved starvation therapy.Furthermore,both tumor-associated antigens released during the process of ICD and the intrinsic immunoadjuvant property of M-FS-GOx stimulate dendritic cell maturation to activate antitumor immune responses.This work provides a promising strategy for the construction of Janus nanoparticles to achieve enhanced cancer immunotherapy through combination therapy-amplified ICD.
基金supported by the National Natural Science Foundation of China(Grant Nos.52173271,51922022 and 51773013)the Beijing Outstanding Young Scientist Program(Grant No.BJJWZYJH01201910010024)+3 种基金the China Postdoctoral Science Foundation(Grant Nos.2021T140044 and 2020M670110)the Beijing Municipal Natural Science Foundation(Grant No.2214074)the Beijing Municipal Science and Technology Project(Grant No.Z191100006619099)the Fundamental Research Funds for the Central Universities(Grant Nos.BHYC1705A and XK1802-2)。
文摘Metal-organic frameworks(MOFs)composed of functional metal ions/clusters and suitable bridging ligands are highly designable,which have shown excellent catalytic activity as nanozymes and are promising for antibacterial therapy.Herein,twodimensional(2D)copper MOF nanosheets(Cu-MOF NSs)as effective antibacterial agents were prepared through a simple onestep method.The 2D Cu-MOF NSs displayed a peroxidase-like activity toward H_(2)O_(2)decomposition into highly cytotoxic hydroxyl radicals(·OH).Notably,the 2D morphology of Cu-MOF NSs provides a high density of Cu^(2+)/Cu^(+)surface active sites,which could efficiently oxidize the proteins and lipids on the bacterial surface and induce the death of bacteria.It is found that the as-prepared 2D Cu-MOF NSs exhibited antibacterial properties against Staphylococcus aureus(S.aureus)and could efficiently eradicate the biofilm of S.aureus.Up to 99.9%bacteria were killed at a Cu-MOF concentration of 4μg/m L.This study opens a new avenue for the design of MOF-based antibacterial agents to combat pathogenic bacterial infections.
