1
|
Lin L, Ba Z, Tian H, Qin H, Chen X, Zhou X, Zhao S, Li L, Xue F, Li H, He L, Li X, Du J, Zhou Z, Zeng W. Ultrasound-responsive theranostic platform for the timely monitoring and efficient thrombolysis in thrombi of tPA resistance. Nat Commun 2024; 15:6610. [PMID: 39098904 PMCID: PMC11298549 DOI: 10.1038/s41467-024-50741-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 07/08/2024] [Indexed: 08/06/2024] Open
Abstract
There is no effective and noninvasive solution for thrombolysis because the mechanism by which certain thrombi become tissue plasminogen activator (tPA)-resistant remains obscure. Endovascular thrombectomy is the last option for these tPA-resistant thrombi, thus a new noninvasive strategy is urgently needed. Through an examination of thrombi retrieved from stroke patients, we found that neutrophil extracellular traps (NETs), ε-(γ-glutamyl) lysine isopeptide bonds and fibrin scaffolds jointly comprise the key chain in tPA resistance. A theranostic platform is designed to combine sonodynamic and mechanical thrombolysis under the guidance of ultrasonic imaging. Breakdown of the key chain leads to a recanalization rate of more than 90% in male rat tPA-resistant occlusion model. Vascular reconstruction is observed one month after recanalization, during which there was no thrombosis recurrence. The system also demonstrates noninvasive theranostic capabilities in managing pigs' long thrombi (>8 mm) and in revascularizing thrombosis-susceptible tissue-engineered vascular grafts, indicating its potential for clinical application. Overall, this noninvasive theranostic platform provides a new strategy for treating tPA-resistant thrombi.
Collapse
Affiliation(s)
- Lin Lin
- Department of Cell Biology, Third Military Medical University, Chongqing, China
- School of Medicine, Chongqing University, Chongqing, China
- Chongqing Institute of Advanced Pathology, Jinfeng Laboratory, Chongqing, China
| | - Zhaojing Ba
- Department of Cell Biology, Third Military Medical University, Chongqing, China
| | - Hao Tian
- Department of Cell Biology, Third Military Medical University, Chongqing, China
| | - Haoxiang Qin
- Department of Cell Biology, Third Military Medical University, Chongqing, China
| | - Xi Chen
- Department of Neurology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | - Xin Zhou
- Department of Cell Biology, Third Military Medical University, Chongqing, China
| | - Shanlan Zhao
- Department of Cell Biology, Third Military Medical University, Chongqing, China
| | - Lang Li
- Department of Cell Biology, Third Military Medical University, Chongqing, China
| | - Fangchao Xue
- Department of Cell Biology, Third Military Medical University, Chongqing, China
| | - Hong Li
- Department of Anesthesiology, Xinqiao Hospital, Third Military Medical University, Chongqing, China
| | - Lang He
- Department of Cell Biology, Third Military Medical University, Chongqing, China
- Chongqing Institute of Advanced Pathology, Jinfeng Laboratory, Chongqing, China
| | - Xiaochen Li
- Department of Cell Biology, Third Military Medical University, Chongqing, China
| | - Jiahui Du
- Department of Cell Biology, Third Military Medical University, Chongqing, China
| | - Zhenhua Zhou
- Department of Neurology, Southwest Hospital, Third Military Medical University, Chongqing, China.
| | - Wen Zeng
- Department of Cell Biology, Third Military Medical University, Chongqing, China.
- Chongqing Institute of Advanced Pathology, Jinfeng Laboratory, Chongqing, China.
- State Key Laboratory of Trauma, Burn and Combined Injury, Southwest Hospital, Third Military Medical University, Chongqing, China.
| |
Collapse
|
2
|
Fan Y, Pei J, Qin Y, Du H, Qu X, Li W, Huang B, Tan J, Liu Y, Li G, Ke M, Xu Y, Zhu C. Construction of tissue-engineered vascular grafts with enhanced patency by integrating heparin, cell-adhesive peptide, and carbon monoxide nanogenerators into acellular blood vessels. Bioact Mater 2024; 34:221-236. [PMID: 38235307 PMCID: PMC10792202 DOI: 10.1016/j.bioactmat.2023.12.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 12/11/2023] [Accepted: 12/21/2023] [Indexed: 01/19/2024] Open
Abstract
Small-diameter tissue-engineered vascular grafts (sdTEVGs) have garnered significant attention as a potential treatment modality for vascular bypass grafting and replacement therapy. However, the intimal hyperplasia and thrombosis are two major complications that impair graft patency during transplantation. To address this issue, we fabricated the covalent-organic framework (COF)-based carbon monoxide (CO) nanogenerator-and co-immobilized with LXW-7 peptide and heparin to establish a multifunctional surface on TEVGs constructed from acellular blood vessels for preventing thrombosis and stenosis. The cell-adhesive peptide LXW-7 could capture endothelial-forming cells (EFCs) to promote endothelialization, while the antithrombotic molecule heparin prevented thrombus formation. The reactive oxygen species (ROS)-triggered CO release suppressed the adhesion and activation of macrophages, leading to the reduction of ROS and inflammatory factors. As a result, the endothelial-to-mesenchymal transition (EndMT) triggered by inflammation was restricted, facilitating the maintenance of the homeostasis of the neo-endothelium and preventing pathological remodeling in TEVGs. When transplanted in vivo, these vascular grafts exhibited negligible intimal hyperplasia and remained patent for 3 months. This achievement provided a novel approach for constructing antithrombotic and anti-hyperplastic TEVGs.
Collapse
Affiliation(s)
- Yonghong Fan
- Department of Anatomy, Engineering Research Center for Organ Intelligent Biological Manufacturing of Chongqing, Key Lab for Biomechanics and Tissue Engineering of Chongqing, Third Military Medical University, Chongqing, 400038, China
- Laboratory of Basic Medicine, The General Hospital of Western Theater Command, Chengdu, 610083, China
- Engineering Research Center of Tissue and Organ Regeneration and Manufacturing, Ministry of Education, Chongqing, 400038, China
| | - Juan Pei
- Department of Anatomy, Engineering Research Center for Organ Intelligent Biological Manufacturing of Chongqing, Key Lab for Biomechanics and Tissue Engineering of Chongqing, Third Military Medical University, Chongqing, 400038, China
| | - Yinhua Qin
- Department of Anatomy, Engineering Research Center for Organ Intelligent Biological Manufacturing of Chongqing, Key Lab for Biomechanics and Tissue Engineering of Chongqing, Third Military Medical University, Chongqing, 400038, China
| | - Huifang Du
- Department of Anatomy, Engineering Research Center for Organ Intelligent Biological Manufacturing of Chongqing, Key Lab for Biomechanics and Tissue Engineering of Chongqing, Third Military Medical University, Chongqing, 400038, China
| | - Xiaohang Qu
- Department of Anatomy, Engineering Research Center for Organ Intelligent Biological Manufacturing of Chongqing, Key Lab for Biomechanics and Tissue Engineering of Chongqing, Third Military Medical University, Chongqing, 400038, China
| | - Wenya Li
- Department of Anatomy, Engineering Research Center for Organ Intelligent Biological Manufacturing of Chongqing, Key Lab for Biomechanics and Tissue Engineering of Chongqing, Third Military Medical University, Chongqing, 400038, China
| | - Boyue Huang
- Department of Anatomy, Engineering Research Center for Organ Intelligent Biological Manufacturing of Chongqing, Key Lab for Biomechanics and Tissue Engineering of Chongqing, Third Military Medical University, Chongqing, 400038, China
| | - Ju Tan
- Department of Anatomy, Engineering Research Center for Organ Intelligent Biological Manufacturing of Chongqing, Key Lab for Biomechanics and Tissue Engineering of Chongqing, Third Military Medical University, Chongqing, 400038, China
| | - Yong Liu
- Department of Anatomy, Engineering Research Center for Organ Intelligent Biological Manufacturing of Chongqing, Key Lab for Biomechanics and Tissue Engineering of Chongqing, Third Military Medical University, Chongqing, 400038, China
| | - Gang Li
- Department of Anatomy, Engineering Research Center for Organ Intelligent Biological Manufacturing of Chongqing, Key Lab for Biomechanics and Tissue Engineering of Chongqing, Third Military Medical University, Chongqing, 400038, China
| | - Ming Ke
- Department of Anatomy, Engineering Research Center for Organ Intelligent Biological Manufacturing of Chongqing, Key Lab for Biomechanics and Tissue Engineering of Chongqing, Third Military Medical University, Chongqing, 400038, China
- Engineering Research Center of Tissue and Organ Regeneration and Manufacturing, Ministry of Education, Chongqing, 400038, China
| | - Youqian Xu
- Department of Anatomy, Engineering Research Center for Organ Intelligent Biological Manufacturing of Chongqing, Key Lab for Biomechanics and Tissue Engineering of Chongqing, Third Military Medical University, Chongqing, 400038, China
- Engineering Research Center of Tissue and Organ Regeneration and Manufacturing, Ministry of Education, Chongqing, 400038, China
| | - Chuhong Zhu
- Department of Anatomy, Engineering Research Center for Organ Intelligent Biological Manufacturing of Chongqing, Key Lab for Biomechanics and Tissue Engineering of Chongqing, Third Military Medical University, Chongqing, 400038, China
- Engineering Research Center of Tissue and Organ Regeneration and Manufacturing, Ministry of Education, Chongqing, 400038, China
- State Key Laboratory of Trauma and Chemical Poisoning, Chongqing, 400038, China
- Department of Plastic and Aesthetic Surgery, Southwest Hospital, Third Military Medical University, Chongqing, 400038, China
| |
Collapse
|
3
|
Yao L, Liu Q, Lei Z, Sun T. Development and challenges of antimicrobial peptide delivery strategies in bacterial therapy: A review. Int J Biol Macromol 2023; 253:126819. [PMID: 37709236 DOI: 10.1016/j.ijbiomac.2023.126819] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 09/06/2023] [Accepted: 09/07/2023] [Indexed: 09/16/2023]
Abstract
The escalating global prevalence of antimicrobial resistance poses a critical threat, prompting concerns about its impact on public health. This predicament is exacerbated by the acute shortage of novel antimicrobial agents, a scarcity attributed to the rapid surge in bacterial resistance. This review delves into the realm of antimicrobial peptides, a diverse class of compounds ubiquitously present in plants and animals across various natural organisms. Renowned for their intrinsic antibacterial activity, these peptides provide a promising avenue to tackle the intricate challenge of bacterial resistance. However, the clinical utility of peptide-based drugs is hindered by limited bioavailability and susceptibility to rapid degradation, constraining efforts to enhance the efficacy of bacterial infection treatments. The emergence of nanocarriers marks a transformative approach poised to revolutionize peptide delivery strategies. This review elucidates a promising framework involving nanocarriers within the realm of antimicrobial peptides. This paradigm enables meticulous and controlled peptide release at infection sites by detecting dynamic shifts in microenvironmental factors, including pH, ROS, GSH, and reactive enzymes. Furthermore, a glimpse into the future reveals the potential of targeted delivery mechanisms, harnessing inflammatory responses and intricate signaling pathways, including adenosine triphosphate, macrophage receptors, and pathogenic nucleic acid entities. This approach holds promise in fortifying immunity, thereby amplifying the potency of peptide-based treatments. In summary, this review spotlights peptide nanosystems as prospective solutions for combating bacterial infections. By bridging antimicrobial peptides with advanced nanomedicine, a new therapeutic era emerges, poised to confront the formidable challenge of antimicrobial resistance head-on.
Collapse
Affiliation(s)
- Longfukang Yao
- School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China; Hubei Key Laboratory of Nanomedicine for Neurodegenerative Diseases, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China
| | - Qianying Liu
- School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Zhixin Lei
- School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China; Hubei Key Laboratory of Nanomedicine for Neurodegenerative Diseases, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China.
| | - Taolei Sun
- School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China; Hubei Key Laboratory of Nanomedicine for Neurodegenerative Diseases, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China.
| |
Collapse
|
4
|
Yan J, Xiao H, Zhou X, Li Y, Zhao S, Zhao X, Liu Y, Liu M, Xue F, Zhang Q, Zhao W, Li L, Su Y, Zeng W. Engineered exosomes reprogram Gli1 + cells in vivo to prevent calcification of vascular grafts and autologous pathological vessels. SCIENCE ADVANCES 2023; 9:eadf7858. [PMID: 37478186 PMCID: PMC10361604 DOI: 10.1126/sciadv.adf7858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Accepted: 06/20/2023] [Indexed: 07/23/2023]
Abstract
Calcification of autologous pathological vessels and tissue engineering blood vessels (TEBVs) is a thorny problem in clinic. However, there is no effective and noninvasive treatment that is available against the calcification of TEBVs and autologous pathological vessels. Gli1+ cells are progenitors of smooth muscle cells (SMCs) and can differentiate into osteoblast-like cells, leading to vascular calcification. Our results showed that the spatiotemporal distribution of Gli1+ cells in TEBVs was positively correlated with the degree of TEBV calcification. An anticalcification approach was designed consisting of exosomes derived from mesenchymal stem cells delivering lncRNA-ANCR to construct the engineered exosome-Ancr/E7-EXO. The results showed that Ancr/E7-EXO effectively targeted Gli1+ cells, promoting rapid SMC reconstruction and markedly inhibiting Gli1+ cell differentiation into osteoblast-like cells. Moreover, Ancr/E7-EXO significantly inhibited vascular calcification caused by chronic kidney disease. Therefore, Ancr/E7-EXO reprogrammed Gli1+ cells to prevent calcification of vascular graft and autologous pathological vessel, providing unique insights for an effective anticalcification.
Collapse
Affiliation(s)
- Juan Yan
- Department of Cell Biology, Third Military Army Medical University, Chongqing 400038, China
| | - Haoran Xiao
- Department of Cell Biology, Third Military Army Medical University, Chongqing 400038, China
| | - Xin Zhou
- Department of Cell Biology, Third Military Army Medical University, Chongqing 400038, China
| | - Yanzhao Li
- Department of Anatomy, National and Regional Engineering Laboratory of Tissue Engineering, State and Local Joint Engineering Laboratory for Vascular Implants, Key Lab for Biomechanics and Tissue Engineering of Chongqing, Third Military Medical University, Chongqing 400038, China
| | - Shanlan Zhao
- Department of Cell Biology, Third Military Army Medical University, Chongqing 400038, China
| | - Xingli Zhao
- Department of Cell Biology, Third Military Army Medical University, Chongqing 400038, China
| | - Yong Liu
- Department of Anatomy, National and Regional Engineering Laboratory of Tissue Engineering, State and Local Joint Engineering Laboratory for Vascular Implants, Key Lab for Biomechanics and Tissue Engineering of Chongqing, Third Military Medical University, Chongqing 400038, China
| | - Min Liu
- Department of Cell Biology, Third Military Army Medical University, Chongqing 400038, China
| | - Fangchao Xue
- Department of Cell Biology, Third Military Army Medical University, Chongqing 400038, China
| | - Qiao Zhang
- Department of Cell Biology, Third Military Army Medical University, Chongqing 400038, China
| | - Wenyan Zhao
- Department of Cell Biology, Third Military Army Medical University, Chongqing 400038, China
| | - Lang Li
- Department of Cell Biology, Third Military Army Medical University, Chongqing 400038, China
| | - Yang Su
- Department of Cell Biology, Third Military Army Medical University, Chongqing 400038, China
| | - Wen Zeng
- Department of Cell Biology, Third Military Army Medical University, Chongqing 400038, China
- State Key Laboratory of Trauma, Burn and Combined Injury, Chongqing, China
- Jinfeng Laboratory, Chongqing 401329, China
| |
Collapse
|
5
|
Brown TK, Alharbi S, Ho KJ, Jiang B. Prosthetic vascular grafts engineered to combat calcification: Progress and future directions. Biotechnol Bioeng 2023; 120:953-969. [PMID: 36544433 PMCID: PMC10023339 DOI: 10.1002/bit.28316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 12/16/2022] [Accepted: 12/19/2022] [Indexed: 12/24/2022]
Abstract
Calcification in prosthetic vascular conduits is a major challenge in cardiac and vascular surgery that compromises the long-term performance of these devices. Significant research efforts have been made to understand the etiology of calcification in the cardiovascular system and to combat calcification in various cardiovascular devices. Novel biomaterial design and tissue engineering strategies have shown promise in preventing or delaying calcification in prosthetic vascular grafts. In this review, we highlight recent advancements in the development of acellular prosthetic vascular grafts with preclinical success in attenuating calcification through advanced biomaterial design. We also discuss the mechanisms of action involved in the designs that will contribute to the further understanding of cardiovascular calcification. Lastly, recent insights into the etiology of vascular calcification will guide the design of future prosthetic vascular grafts with greater potential for translational success.
Collapse
Affiliation(s)
- Taylor K. Brown
- Department of Biomedical Engineering, Northwestern University, Chicago, IL
| | - Sara Alharbi
- Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL
| | - Karen J. Ho
- Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL
| | - Bin Jiang
- Department of Biomedical Engineering, Northwestern University, Chicago, IL
- Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL
| |
Collapse
|
6
|
Huang N, Wang D, Zhu TT, Ge XY, Liu H, Yao MZ, Guo YZ, Peng J, Wang Q, Zhang Z, Hu CP. Plasma exosomes confer hypoxic pulmonary hypertension by transferring LOX-1 cargo to trigger phenotypic switching of pulmonary artery smooth muscle cells. Biochem Pharmacol 2023; 207:115350. [PMID: 36435201 DOI: 10.1016/j.bcp.2022.115350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 10/05/2022] [Accepted: 11/10/2022] [Indexed: 11/24/2022]
Abstract
The pulmonary vascular remodeling (PVR), the pathological basis of pulmonary hypertension (PH), entails pulmonary artery smooth muscle cells (PASMCs) phenotypic switching, but appreciation of the underlying mechanisms is incomplete. Exosomes, a novel transfer machinery enabling delivery of its cargos to recipient cells, have been recently implicated in cardiovascular diseases including PH. The two critical questions of whether plasma-derived exosomes drive PASMCs phenotypic switching and what cargo the exosomes transport, however, remain unclear. Herein, by means of transmission electron microscopy and protein detection, we for the first time, characterized lectin like oxidized low-density lipoprotein receptor-1 (LOX-1) as a novel cargo of plasma-derived exosomes in PH. With LOX-1 knockout (Olr1-/-) rats-derived exosomes, we demonstrated that exosomal LOX-1 could be transferred into PASMCs and thus elicited cell phenotypic switching. Of importance, Olr1-/- rats exhibited no cell phenotypic switching and developed less severe PH, but administration of wild type rather than Olr1-/- exosomes to Olr1-/- rats recapitulated the phenotype of PH with robust PASMCs phenotypic switching. We also revealed that exosomal LOX-1 triggered PASMCs phenotypic switching, PVR and ultimately PH via ERK1/2-KLF4 signaling axis. This study has generated proof that plasma-derived exosomes confer PH by delivering LOX-1 into PASMCs. Hence, exosomal LOX-1 represents a novel exploitable target for PH prevention and treatment.
Collapse
Affiliation(s)
- Ning Huang
- Department of Pharmacology, Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, Hunan 410078, China; Department of Pharmacy, The First Affiliated Hospital of Zhengzhou University, Zhengzhou Henan 450052, China
| | - Di Wang
- Department of Pharmacology, Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, Hunan 410078, China
| | - Tian-Tian Zhu
- College of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453000, China; Henan International Joint Laboratory of Cardiovascular Remodeling and Drug Intervention, Xinxiang, Henan 453000, China
| | - Xiao-Yue Ge
- Department of Pharmacology, Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, Hunan 410078, China
| | - Hong Liu
- Department of Pharmacology, Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, Hunan 410078, China
| | - Mao-Zhong Yao
- Department of Pharmacology, Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, Hunan 410078, China
| | - Yan-Zi Guo
- Department of Pharmacology, Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, Hunan 410078, China
| | - Jun Peng
- Department of Pharmacology, Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, Hunan 410078, China; Hunan Provincial Key Laboratory of Cardiovascular Research, Central South University, Changsha, Hunan 410078, China
| | - Qing Wang
- The Interventional Radiology & Vascular Surgery Department, Hunan Provincial People's Hospital, The First Affiliated Hospital of Hunan Normal University, China
| | - Zheng Zhang
- Department of Pharmacology, Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, Hunan 410078, China; Hunan Provincial Key Laboratory of Cardiovascular Research, Central South University, Changsha, Hunan 410078, China.
| | - Chang-Ping Hu
- Department of Pharmacology, Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, Hunan 410078, China; Hunan Provincial Key Laboratory of Cardiovascular Research, Central South University, Changsha, Hunan 410078, China.
| |
Collapse
|
7
|
A dual crosslinked hydrogel-mediated integrated peptides and BMSC therapy for myocardial regeneration. J Control Release 2022; 347:127-142. [PMID: 35460706 DOI: 10.1016/j.jconrel.2022.04.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 03/07/2022] [Accepted: 04/08/2022] [Indexed: 12/27/2022]
Abstract
The efficacy of myocardial regeneration strategies for myocardial infarction (MI) is significantly compromised by the complex structure and microenvironment of the myocardium. Although tissue engineering strategies based on cell therapy and/or pro-angiogenesis can somewhat improve cardiac function, the lack of proper myocardial materials that can withstand sustained deformability and adaptable mechanical properties severely affects myocardial wall integrity, systolic-diastolic cycles, and regeneration. Herein, we developed an integrated single "all-in-one" in situ dual crosslinking conductive hydrogel with favorable treatment properties termed as MaHA/B-G-SH/Fe3+ by ionic interactions and chemical covalency based on modified hyaluronic acid (HA), gelatin (G), and Fe3+. The resulting dual crosslinking dynamic hydrogel not only provides self-healing and mechanical properties adapted to the myocardial systolic-diastolic cycle with simultaneous electrical signal transmission to fibrous islands and normal tissue, but also leads to significant increase of the myocardial wall thickness very close to that of normal myocardium upon one single injection with complete degradation within 28 days. Notably, the hydrogel covalently conjugated with a tailored peptide sequence of GGR-KLT and encapsulated with bone mesenchymal stem cells (BMSCs) was further used for in situ injection in a rat MI model, which exhibited (i) efficient inhibition of excessive matrix degradation dependent on early MMP-2 expression, (ii) triggered on-demand release of KLT for at least 14 days and significant promotion of angiogenesis, and (iii) synergistic BMSCs considerably enhanced myocardial regeneration within 28 days. Taken together, the dual crosslinking conductive hydrogel-mediated synergistic peptide and cell therapy provides comprehensive recovery and regeneration of the structure and function of the injured myocardium, thus demonstrating great potential for clinical translations.
Collapse
|