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Zhang S, Qiu J, Guo Y, Gao Q, Guo Z. Naturally derived double-network hydrogels with application as flexible adhesive sensors. Int J Biol Macromol 2024; 277:134131. [PMID: 39074703 DOI: 10.1016/j.ijbiomac.2024.134131] [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: 05/16/2024] [Revised: 07/17/2024] [Accepted: 07/22/2024] [Indexed: 07/31/2024]
Abstract
Hydrogels have been widely used in the biomedical field, including wearable sensors and biological adhesives. However, achieving a balance between various functionalities, such as wet adhesion, stable conductivity, and biocompatibility, in one customized hydrogel has been a challenging issue. In this study, we developed a multifunctional hydrogel comprising recombinant human collagen (RHC) and aldehyde-modified sodium alginate (Ald-alginate), which was primarily crosslinked through a Schiff-base reaction and metal chelation. Due to the combination of a dynamic covalent crosslinking network (imine linkage between RHC and Ald-alginate) and a dynamic ionic crosslinking network (ionic bonding between Ca2+ and Ald-alginate), the hydrogel exhibited excellent self-healing and injectable behaviors. Benefiting from the high Ca2+ content, the hydrogel also attained antifreezing and conductivity properties. In addition to its excellent conductivity and biocompatibility, the hydrogel exhibited strong wet tissue adhesion ability and could adhere rapidly and strongly to the surfaces of various objects or biological tissues, forming a good sealing environment. Moreover, the hydrogel could be directly adhered to a tissue surface as a flexible sensor to accurately detect physiological signals. The versatility of this multifunctional hydrogel will open new avenues for biomedical applications, such as bioadhesives and biosensing.
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Affiliation(s)
- Shiqiang Zhang
- School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Jingjiang Qiu
- School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Yilin Guo
- School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Qiulei Gao
- School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Zhongwei Guo
- School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China.
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2
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Tan J, Luo Y, Guo Y, Zhou Y, Liao X, Li D, Lai X, Liu Y. Development of alginate-based hydrogels: Crosslinking strategies and biomedical applications. Int J Biol Macromol 2023; 239:124275. [PMID: 37011751 DOI: 10.1016/j.ijbiomac.2023.124275] [Citation(s) in RCA: 30] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 02/10/2023] [Accepted: 03/28/2023] [Indexed: 04/03/2023]
Abstract
Natural polysaccharide-based hydrogels have drawn much concern in the biomedical fields. Among them, alginate, a natural polyanionic polysaccharide, has become one of the research hotspots, because of its abundant source, biodegradability, biocompatibility, solubility, modification flexibility, and other characteristics or physiological functions. Recently, through adopting various physical or chemical crosslinking strategies, selecting suitable crosslinking or modification reagents, precisely controlling the reaction conditions, or introducing organic or inorganic functional materials, a variety of alginate-based hydrogels with excellent performance have been continuously developed, considerably expanding the breadth and depth of their applications. Here, various crosslinking strategies in the preparation of alginate-based hydrogels are comprehensively introduced. The representative application progress of alginate-based hydrogels in drug carrier, wound dressing and tissue engineering is also summarized. Meanwhile, the application prospects, challenges and development trends of alginate-based hydrogels are discussed. It is expected to provide guidance and reference for the further development of alginate-based hydrogels.
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3
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Agles AA, Bourg IC. Structure-Thermodynamic Relationship of a Polysaccharide Gel (Alginate) as a Function of Water Content and Counterion Type (Na vs Ca). J Phys Chem B 2023; 127:1828-1841. [PMID: 36791328 PMCID: PMC10159261 DOI: 10.1021/acs.jpcb.2c07129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
Biofilms are the predominant mode of microbial life on Earth, and so a deep understanding of microbial communities─and their impacts on environmental processes─requires a firm understanding of biofilm properties. Because of the importance of biofilms to their microbial inhabitants, microbes have evolved different ways of engineering and reconfiguring the matrix of extracellular polymeric substances (EPS) that constitute the main non-living component of biofilms. This ability makes it difficult to distinguish between the biotic and abiotic origins of biofilm properties. An important route toward establishing this distinction has been the study of simplified models of the EPS matrix. This study builds on such efforts by using atomistic simulations to predict the nanoscale (≤10 nm scale) structure of a model EPS matrix and the sensitivity of this structure to interpolymer interactions and water content. To accomplish this, we use replica exchange molecular dynamics (REMD) simulations to generate all-atom configurations of ten 3.4 kDa alginate polymers at a range of water contents and Ca-Na ratios. Simulated systems are solvated with explicitly modeled water molecules, which allows us to capture the discrete structure of the hydrating water and to examine the thermodynamic stability of water in the gels as they are progressively dehydrated. Our primary findings are that (i) the structure of the hydrogels is highly sensitive to the identity of the charge-compensating cations, (ii) the thermodynamics of water within the gels (specific enthalpy and free energy) are, surprisingly, only weakly sensitive to cation identity, and (iii) predictions of the differential enthalpy and free energy of hydration include a short-ranged enthalpic term that promotes hydration and a longer-ranged (presumably entropic) term that promotes dehydration, where short and long ranges refer to distances shorter or longer than ∼0.6 nm between alginate strands.
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Affiliation(s)
- Avery A Agles
- Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, United States
| | - Ian C Bourg
- Department of Civil and Environmental Engineering and High Meadows Environmental Institute, Princeton University, Princeton, New Jersey 08544, United States
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4
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Xia S, Yin F, Xu L, Zhao B, Wu W, Ma Y, Lin JM, Liu Y, Zhao M, Hu Q. Paper-Based Distance Sensor for the Detection of Lipase via a Phase Separation-Induced Viscosity Change. Anal Chem 2022; 94:17055-17062. [PMID: 36455011 DOI: 10.1021/acs.analchem.2c03019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
Human pancreatic lipase is a symbolic biomarker for the diagnosis of acute pancreatitis, which has profound significance for clinical detection and disease treatment. Herein, we first demonstrate a paper-based lipase sensor via a phase separation-induced viscosity change. Lipase catalyzes triolein to produce oleic acid and glycerol. Adding an excess of Ca2+ produces calcium oleate. The remaining Ca2+ binds with sodium alginate, triggering hydrogelation with an "egg-box" structure. The viscosity change of the aqueous solution induced by the phase separation process can be quantified by measuring the solution flow distance on a pH test paper. The paper-based lipase sensor has high sensitivity with a detection limit of 0.052 U/mL and also shows excellent specificity. Additionally, it is also utilized for quantitative lipase analysis in human serum samples to exhibit its potency in acute pancreatitis detection. This method overcomes the drawbacks of low sensitivity, slow response, and poor reproducibility caused by the nonuniform distribution of the highly viscous hydrogel on the sensing interface in existing approaches. In conclusion, thanks to the prominent characteristics of high portability, low cost, and easy operation, it is prospective for simple quantitative detection of lipase and has great potential for commercialization.
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Affiliation(s)
- Shuang Xia
- School of Pharmaceutical Sciences, Qilu University of Technology (Shandong Academy of Sciences), Shandong Analysis and Test Center, Jinan250014, China.,Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan250014, China
| | - Fangchao Yin
- School of Pharmaceutical Sciences, Qilu University of Technology (Shandong Academy of Sciences), Shandong Analysis and Test Center, Jinan250014, China.,Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan250014, China
| | - Lulu Xu
- Department of Laboratory Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan250021, China
| | - Binglu Zhao
- School of Pharmaceutical Sciences, Qilu University of Technology (Shandong Academy of Sciences), Shandong Analysis and Test Center, Jinan250014, China.,Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan250014, China
| | - Wenli Wu
- School of Pharmaceutical Sciences, Qilu University of Technology (Shandong Academy of Sciences), Shandong Analysis and Test Center, Jinan250014, China.,Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan250014, China
| | - Yaohong Ma
- Key Laboratory for Biosensors of Shandong Province, Biology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan250353, China
| | - Jin-Ming Lin
- Beijing Key Laboratory of Microanalytical Methods and Instrumentation, MOE Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Department of Chemistry, Tsinghua University, Beijing100084, China
| | - Yulin Liu
- Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan250014, China.,Department of General Surgery, The First Affiliated Hospital of Shandong First Medical University, Jinan250014, China
| | - Mei Zhao
- School of Pharmaceutical Sciences, Qilu University of Technology (Shandong Academy of Sciences), Shandong Analysis and Test Center, Jinan250014, China.,Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan250014, China
| | - Qiongzheng Hu
- School of Pharmaceutical Sciences, Qilu University of Technology (Shandong Academy of Sciences), Shandong Analysis and Test Center, Jinan250014, China.,Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan250014, China
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5
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Shen KH, Yeh YY, Chiu TH, Wang R, Yeh YC. Dual Dynamic Covalently Crosslinked Alginate Hydrogels with Tunable Properties and Multiple Stimuli-Responsiveness. ACS Biomater Sci Eng 2022; 8:4249-4261. [PMID: 36173708 DOI: 10.1021/acsbiomaterials.2c00571] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Alginate is a biopolymer that can be crosslinked with calcium ions to fabricate cytocompatible hydrogels. However, using calcium ions to crosslink alginate provides limited properties and functions to alginate hydrogels, restricting their biomedical applications. Here, phenylboronic acid-functionalized polyethyleneimine (PBA-PEI) was developed to introduce two orthogonal dynamic covalent crosslinks in the alginate hydrogels, where PBA-PEI was used to crosslink alginate dialdehyde (ADA) through imine bonds and boronate ester bonds. The grafting degree of PBA in the PEI structure was applied to fine-tune the properties of PBA-PEI/ADA hydrogels, including the rheological property, mechanical strength, swelling behavior, and antibacterial activity. In particular, the highly sensitive boronate ester bonds in the network enabled PBA-PEI/ADA hydrogels to be responsive to several stimuli, such as glucose, fructose, and hydrogen peroxide. Taken together, PBA-PEI/ADA hydrogels with tunable properties and multiple stimuli-responsiveness have been demonstrated as smart biomaterials for advanced biomedical applications.
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Affiliation(s)
- Ke-Han Shen
- Institute of Polymer Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Ying-Yu Yeh
- Institute of Polymer Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Ting-Hsiang Chiu
- Institute of Polymer Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Reuben Wang
- Institute of Food Safety and Health, National Taiwan University, Taipei 10055, Taiwan
| | - Yi-Cheun Yeh
- Institute of Polymer Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
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6
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Zhou J, Wu Y, Tang Z, Zou K, Chen J, Lei Z, Wan X, Liu Y, Zhang H, Wang Y, Blesch A, Lei T, Liu S. Alginate hydrogel cross-linked by Ca2+ to promote spinal cord neural stem/progenitor cell differentiation and functional recovery after a spinal cord injury. Regen Biomater 2022; 9:rbac057. [PMID: 36072264 PMCID: PMC9438746 DOI: 10.1093/rb/rbac057] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2022] [Revised: 07/26/2022] [Accepted: 08/07/2022] [Indexed: 12/04/2022] Open
Abstract
Alginate capillary hydrogels seeded with differentiated cells can fill the lesion cavity and promote axonal regeneration after grafting into the injured spinal cord. Neural stem/progenitor cells (NSPCs) can potentially repair the spinal cord; however, effects of alginate hydrogels (AHs) on NSPCs remain unknown. In this study, we fabricated AHs cross-linked by Ca2+ and seeded hydrogels with rat embryonic day 14 NSPCs. Immunocytochemistry and electron microscopy show that NSPCs survive, proliferate and differentiate into neurons in vitro within the capillaries. After transplantation into an acute T8 complete spinal cord transection site in adult rats, approximately one-third (38.3%) of grafted cells survive and differentiate into neurons (40.7%), astrocytes (26.6%) and oligodendrocytes (28.4%) at 8 weeks post-grafting. NSPCs promote the growth of host axons within the capillaries in a time-dependent manner. Host axons make synapse-like contacts with NSPC-derived neurons within the hydrogel channels, and graft-derived axons extend into the host white and gray matter making putative synapses. This is paralleled by improved electrophysiological conductivity across the lesion and partial hindlimb locomotor recovery.
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Affiliation(s)
- Jun Zhou
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology Department of Neurosurgery, , Wuhan, P.R. China
| | - Yaqi Wu
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology Department of Neurosurgery, , Wuhan, P.R. China
| | - Zhijian Tang
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology Department of Neurosurgery, , Wuhan, P.R. China
| | - Kaipeng Zou
- Chongqing University Affiliated Jiangjin Hospital (Jiangjin Central Hospital) Department of Anus-intestines, , Chongqing, P.R. China
| | - Juan Chen
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology Department of Neurosurgery, , Wuhan, P.R. China
| | - Zuowei Lei
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology Department of Orthopedics, , Wuhan, P.R. China
| | - Xueyan Wan
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology Department of Neurosurgery, , Wuhan, P.R. China
| | - Yanchao Liu
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology Department of Neurosurgery, , Wuhan, P.R. China
| | - Huaqiu Zhang
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology Department of Neurosurgery, , Wuhan, P.R. China
| | - Yu Wang
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology Department of Neurosurgery, , Wuhan, P.R. China
| | - Armin Blesch
- University of California San Diego Department of Neurosciences, , LaJolla, CA, USA
- Veterans Affairs San Diego Healthcare System , La Jolla, CA, USA
| | - Ting Lei
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology Department of Neurosurgery, , Wuhan, P.R. China
| | - Shengwen Liu
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology Department of Neurosurgery, , Wuhan, P.R. China
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7
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Papadimitriou P, Andriotis EG, Fatouros D, Tzetzis D. Design and Prototype Fabrication of a Cost-Effective Microneedle Drug Delivery Apparatus Using Fused Filament Fabrication, Liquid Crystal Display and Semi-Solid Extrusion 3D Printing Technologies. MICROMACHINES 2022; 13:1319. [PMID: 36014241 PMCID: PMC9415897 DOI: 10.3390/mi13081319] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 08/10/2022] [Accepted: 08/13/2022] [Indexed: 06/15/2023]
Abstract
The current study describes the design of a cost-effective drug delivery apparatus that can be manufactured, assembled, and utilized as easily and quickly as possible, minimizing the time and expense of the supply chain. This apparatus could become a realistic alternative method of providing a vaccine or drug in harsh circumstances, including humanitarian disasters or a lack of medical and nursing staff, conditions that are frequently observed in developing countries. Simultaneously, with the use of microneedles (MNs), the apparatus can benefit from the numerous advantages offered by them during administration. The hollow microneedles in particular are internally perforated and are capable of delivering the active substance to the skin. The apparatus was designed with appropriate details in computer aided design software, and various 3D printing technologies were utilized in order to fabricate the prototype. The parts that required minimum accuracy, such as the main body of the apparatus, were fabricated with fused filament fabrication. The internal parts and the hollow microneedles were fabricated with liquid crystal display, and the substance for the drug loading carrier, which was an alginate gel cylinder, was fabricated with semi-solid extrusion 3D printing.
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Affiliation(s)
- Petros Papadimitriou
- Digital Manufacturing and Materials Characterization Laboratory, School of Science and Technology, International Hellenic University, GR-57001 Thessaloniki, Greece
| | - Eleftherios G. Andriotis
- Laboratory of Pharmaceutical Technology, Department of Pharmaceutical Sciences, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece
| | - Dimitrios Fatouros
- Laboratory of Pharmaceutical Technology, Department of Pharmaceutical Sciences, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece
| | - Dimitrios Tzetzis
- Digital Manufacturing and Materials Characterization Laboratory, School of Science and Technology, International Hellenic University, GR-57001 Thessaloniki, Greece
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8
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Moon SH, Choi HN, Yang YJ. Natural/Synthetic Polymer Materials for Bioink Development. BIOTECHNOL BIOPROC E 2022. [DOI: 10.1007/s12257-021-0418-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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9
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Hu X, Zhang L, Yan L, Tang L. Recent Advances in Polysaccharide-Based Physical Hydrogels and Their Potential Applications for Biomedical and Wastewater Treatment. Macromol Biosci 2022; 22:e2200153. [PMID: 35584011 DOI: 10.1002/mabi.202200153] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 05/10/2022] [Indexed: 11/06/2022]
Abstract
Polysaccharides have been widely employed to fabricate hydrogels owing to their intrinsic properties including biocompatibility, biodegradability, sustainability, and easy modification. However, a considerable amount of polysaccharide-based hydrogels are prepared by chemical crosslinking method using organic solvents or toxic crosslinkers. The presence of reaction by-products and residual toxic substances in the obtained materials cause a potential secondary pollution risk and thus severely limited their practical applications. In contrast, polysaccharide-based physical hydrogels are preferred over chemically derived hydrogels and can be used to address existing drawbacks of chemical hydrogels. The polysaccharide chains of such hydrogel are typically crosslinked by dynamic non-covalent bonds, and the co-existence of multiple physical interactions stabilize the hydrogel network. This review focuses on providing a detailed outlook for the design strategies and formation mechanisms of polysaccharide-based physical hydrogels as well as their specific applications in tissue engineering, drug delivery, wound healing, and wastewater treatment. The main preparation principles, future challenges, and potential improvements are also outlined. The authors hope that this review could provide valuable information for the rational fabrication of polysaccharide-based physical hydrogel. The specific research works listed in the review will provide a systematic and solid research basis for the reliable development of polysaccharide-based physical hydrogel. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Xinyu Hu
- Institute of Chemical Industry of Forest Products, CAF, Key Lab. of Biomass Energy and Material, Jiangsu Province, National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing, 210042, China.,Research Institute of Forestry New Technology, CAF, Beijing, 100091, China
| | - Liangliang Zhang
- Institute of Chemical Industry of Forest Products, CAF, Key Lab. of Biomass Energy and Material, Jiangsu Province, National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing, 210042, China
| | - Linlin Yan
- Institute of Chemical Industry of Forest Products, CAF, Key Lab. of Biomass Energy and Material, Jiangsu Province, National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing, 210042, China.,Research Institute of Forestry New Technology, CAF, Beijing, 100091, China
| | - Lihua Tang
- Institute of Chemical Industry of Forest Products, CAF, Key Lab. of Biomass Energy and Material, Jiangsu Province, National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing, 210042, China
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10
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Jiang T, Yang T, Bao Q, Sun W, Yang M, Mao C. Construction of tissue-customized hydrogels from cross-linkable materials for effective tissue regeneration. J Mater Chem B 2021; 10:4741-4758. [PMID: 34812829 DOI: 10.1039/d1tb01935j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Hydrogels are prevalent scaffolds for tissue regeneration because of their hierarchical architectures along with outstanding biocompatibility and unique rheological and mechanical properties. For decades, researchers have found that many materials (natural, synthetic, or hybrid) can form hydrogels using different cross-linking strategies. Traditional strategies for fabricating hydrogels include physical, chemical, and enzymatical cross-linking methods. However, due to the diverse characteristics of different tissues/organs to be regenerated, tissue-customized hydrogels need to be developed through precisely controlled processes, making the manufacture of hydrogels reliant on novel cross-linking strategies. Thus, hybrid cross-linkable materials are proposed to tackle this challenge through hybrid cross-linking strategies. Here, different cross-linkable materials and their associated cross-linking strategies are summarized. From the perspective of the major characteristics of the target tissues/organs, we critically analyze how different cross-linking strategies are tailored to fit the regeneration of such tissues and organs. To further advance this field, more appropriate cross-linkable materials and cross-linking strategies should be investigated. In addition, some innovative technologies, such as 3D bioprinting, the internet of medical things (IoMT), and artificial intelligence (AI), are also proposed to improve the development of hydrogels for more efficient tissue regeneration.
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Affiliation(s)
- Tongmeng Jiang
- School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, P. R. China
| | - Tao Yang
- School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, P. R. China
| | - Qing Bao
- School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, P. R. China
| | - Weilian Sun
- Department of Periodontology, The Second Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, 310009, P. R. China.
| | - Mingying Yang
- Institute of Applied Bioresource Research, College of Animal Science, Zhejiang University, Yuhangtang Road 866, Hangzhou, Zhejiang 310058, P. R. China.
| | - Chuanbin Mao
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK 73019, USA.
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11
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Egg-box model-based gelation of alginate and pectin: A review. Carbohydr Polym 2020; 242:116389. [PMID: 32564839 DOI: 10.1016/j.carbpol.2020.116389] [Citation(s) in RCA: 272] [Impact Index Per Article: 68.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 04/24/2020] [Accepted: 04/24/2020] [Indexed: 01/08/2023]
Abstract
Alginate and pectin are emblematic natural polyuronates that have been widely used in food, cosmetics and medicine. Ca-dependent gelation is one of their most important functional properties. The gelation mechanisms of alginate and pectin, known as egg-box model, were believed to be basically the same, because their Ca-binding sites show a mirror symmetric conformation. However, studies have found that the formation and the structure of egg-box dimmers between alginate and pectin were different. Very few studies have reviewed those differences. Therefore, this study was proposed to first summarize the intrinsic and extrinsic factors that can influence the gelation of alginate and pectin. The differences in the effect of these factors on the gelation of alginate and pectin were then discussed. Meanwhile, the similarity and difference in their gelation mechanism was also summarized. The knowledge gained in this review would provide useful information for the practical applications of alginate and pectin.
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12
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Electrophysiologic Effects of Growth Hormone Post-Myocardial Infarction. Int J Mol Sci 2020; 21:ijms21030918. [PMID: 32019245 PMCID: PMC7037853 DOI: 10.3390/ijms21030918] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 01/26/2020] [Accepted: 01/28/2020] [Indexed: 02/05/2023] Open
Abstract
Myocardial infarction remains a major health-related problem with significant acute and long-term consequences. Acute coronary occlusion results in marked electrophysiologic alterations that can induce ventricular tachyarrhythmias such as ventricular tachycardia or ventricular fibrillation, often heralding sudden cardiac death. During the infarct-healing stage, hemodynamic and structural changes can lead to left ventricular dilatation and dysfunction, whereas the accompanying fibrosis forms the substrate for re-entrant circuits that can sustain ventricular tachyarrhythmias. A substantial proportion of such patients present clinically with overt heart failure, a common disease-entity associated with high morbidity and mortality. Several lines of evidence point toward a key role of the growth hormone/insulin-like growth factor-1 axis in the pathophysiology of post-infarction structural and electrophysiologic remodeling. Based on this rationale, experimental studies in animal models have demonstrated attenuated dilatation and improved systolic function after growth hormone administration. In addition to ameliorating wall-stress and preserving the peri-infarct myocardium, antiarrhythmic actions were also evident after such treatment, but the precise underlying mechanisms remain poorly understood. The present article summarizes the acute and chronic actions of systemic and local growth hormone administration in the post-infarction setting, placing emphasis on the electrophysiologic effects. Experimental and clinical data are reviewed, and hypotheses on potential mechanisms of action are discussed. Such information may prove useful in formulating new research questions and designing new studies that are expected to increase the translational value of growth hormone therapy after acute myocardial infarction.
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