Search

Zhijun Zhang,1,2 Tiehong Yang,2 Jingwei Wang,2 Zhe Yu,2 Youbei Qiao,2 Chaoli Wang,2 Zhenggang Yue,1 Hong Wu2 1School of Pharmacy, Shaanxi University of Chinese Medicine, Xi’an, People’s Republic of China; 2Department of Medicine Chemistry and Pharmaceutical Analysis, School of Pharmacy, Air Force Medical University, Xi’an, People’s Republic of ChinaCorrespondence: Hong Wu, Department of Medicine Chemistry and Pharmaceutical Analysis, School of Pharmacy, Air Force Medical University, Xi’an, People’s Republic of China, Tel/Fax +86 29 84776823, Email wuhong@fmmu.edu.cn Zhenggang Yue, School of Pharmacy, Shaanxi University of Chinese Medicine, Xi’an, People’s Republic of China, Tel +86 18092086211, Email liuxingjian1981@163.comPurpose: The remarkable peroxidase-like activity of single-atom nanozymes (SAzymes) allows them to catalyze the conversion of H2O2 to •OH, rendering them highly promising for antibacterial applications. However, their practical in vivo application is hindered by the near-neutral pH and insufficient H2O2 levels present in physiological systems. This study was aimed at developing a SAzyme-based nanoreactor and investigating its in vivo antibacterial activity.Methods: We developed a hollow mesoporous molybdenum single-atom nanozyme (HMMo-SAzyme) using a controlled chemical etching approach and pyrolysis strategy. The HMMo-SAzyme not only exhibited excellent catalytic activity but also served as an effective nanocarrier. By loading glucose oxidase (GOx) with HMMo-SAzyme and encapsulating it with hyaluronic acid (HA), a nanoreactor (HMMo/GOx@HA) was constructed as glucose-triggered cascade catalyst for combating bacterial infection in vivo.Results: Hyaluronidase (HAase) at the site of infection degraded HA, allowing GOx to convert glucose into gluconic acid and H2O2. An acid environment significantly enhanced the catalytic activity of HMMo-SAzyme to promote the further catalytic conversion of H2O2 to •OH for bacterial elimination. In vitro and in vivo experiments demonstrated that the nanoreactor had excellent antibacterial activity and negligible biological toxicity.Conclusion: This study represents a significant advancement in developing a cascade catalytic system with high efficiency based on hollow mesoporous SAzyme, promising the advancement of biological applications of SAzyme. Keywords: nanozyme, nanocarrier, glucose oxidase, reactive oxygen species, bacterial infection

Wanchun Cheng,1 Mohammad Mofatteh,2 José Fidel Baizabal-Carvallo,3,4 Shaohuan Lu,1 Ping Su,1 Yimin Chen,5,6 Luoming Li,1 Lizhi Qin,1 Xingmei Zuo,1 Yifeng Lan,7 Yue Huang,8 Zhihui Yu,9 Zirui Luo,10,&ast; Gang Chen10,&ast; 1Department of Neurology and National Stroke Center, The 5th People’s Hospital of Foshan City, Foshan, People’s Republic of China; 2School of Medicine, Dentistry and Biomedical Sciences, Queen’s University Belfast, Belfast, UK; 3Parkinson’s Disease Center and Movement Disorders Clinic, Department of Neurology, Baylor College of Medicine, Houston, Texas, USA; 4Department of Sciences and Engineering, University of Guanajuato, León, Mexico; 5Department of Neurology and Advanced National Stroke Center, Foshan Sanshui District People’s Hospital, Foshan, People’s Republic of China; 6Neuro International Collaboration (NIC), Foshan, People’s Republic of China; 7Department of Radiology, the 5th People’s Hospital of Foshan City, Foshan, People’s Republic of China; 8Department of Emergency, the 5th People’s Hospital of Foshan City, Foshan, People’s Republic of China; 9Department of Laboratory Medicine, the 5th People’s Hospital of Foshan City, Foshan, People’s Republic of China; 10Dean’s Office, the 5th People’s Hospital of Foshan City, Foshan, People’s Republic of China&ast;These authors contributed equally to this workCorrespondence: Zirui Luo; Gang Chen, Dean’s Office, the 5th People’s Hospital of Foshan City, Foshan, Guangdong Province, 528211, People’s Republic of China, Email ziruiluo@126.com; vikingsaga@163.comPurpose: Intravenous thrombolysis has emerged as an effective approach to improve the long-term survival and functional status of patients with ischemic stroke. The aim of this study was to assess the impact of a national stroke project on the door-to-needle-time (DNT).Patients and Methods: The patients were divided into pre-construction and construction periods. Construction Measures were performed during the construction period. The DNT and onset-to-needle time (ONT) were compared in two period groups.Results: After participating in the National Stroke Center Project and effective measurements, the thrombolysis treatment metrics were improved significantly. The DNT (IQR) was shortened from 65.0 (54.5,85.0) minutes in the Pre-Construction period to 40.0 (33.0,53.0) minutes in the Construction period (p < 0.001). Similarly, the ONT was reduced from 157.0 (IQR) (115.0,184.0) minutes to 116.0 (87.8,170.0) minutes (p = 0.035).Conclusion: The DNT time and ONT time can be shortened by National Stroke Center Construction projects. More suitable hospitals should be encouraged to participate as the National Stroke Center.Keywords: acute ischemic stroke, intravenous thrombolysis, door-to-needle time, onset-to-needle time

Hao Qin,1,&ast; Wenjun Wang,2,&ast; Longlong Hu,1 Zuozhong Yu,1 Yang Chen,1 Yuanbin Zhao,1 Yanhui Liao,1 Renqiang Yang1 1Department of Cardiovascular Medicine, the Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, 330006, People’s Republic of China; 2Department of Respiratory Diseases, the Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, 330006, People’s Republic of China&ast;These authors contributed equally to this workCorrespondence: Renqiang Yang, Department of Cardiovascular Medicine, the Second Affiliated Hospital of Nanchang University, 1 Minde Road, Nanchang, Jiangxi, 330006, People’s Republic of China, Tel +86-13979117790, Fax +86-0791-87357375, Email yangrenqiangcn@163.comBackground: Ischemic heart disease is one of the leading causes of death in the world, of which ST-segment elevation myocardial infarction (STEMI) is an important type. Inappropriate activation and accumulation of platelets typically induced thrombosis, which may result in acute vessel occlusion and STEMI. Multiple cytokines have been shown to regulate platelet activation, but the relationship between HMGB2 and platelet activation has not been elucidated.Methods: We collected peripheral blood of STEMI patients and healthy adults, and mass spectrometry analysis of platelet proteins was conducted. The “edgeR” package was used to identify the differentially expressed proteins (DEPs). The Kyoto Encyclopedia of Genes and Genomes (KEGG), Gene ontology (GO) and Gene Set Enrichment Analysis (GSEA) were used to identify the significantly changed pathways. Western blot and ELISA were used to detect the expression of a high mobility group box 2 (HMGB2). Flow cytometric analysis and platelet aggregation rate were performed to evaluate the activation of platelets.Results: We identified ALOX5, HIST1H1B, S100A11, HMGB2, and RPS15A were the top five up-regulated proteins by differential expression analysis. Western blot verified that the relative protein expression of HMGB2 in platelet was significantly higher in STEMI patients compared with control adults, and the results of ELISA indicated that the serum HMGB2 level increased and significantly correlated with neutrophil count in STEMI patients. Further investigation showed that the platelet aggregation induced by ADP, the activation of integrin αIIbβ 3 and CD62P expression on platelet surface were all enhanced by the recombinant HMGB2 (rHMGB2).Conclusion: In conclusion, HMGB2 may be the key molecule to regulate platelet activation in patients with STEMI, which may serve as a potential therapeutic target for STEMI.Keywords: ST-segment elevation myocardial infarction, STEMI, proteomics analysis, platelet, HMGB2