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Mitsuhashi K, Inagaki NF, Ito T. Moldable Tissue-Sealant Hydrogels Composed of In Situ Cross-Linkable Polyethylene Glycol via Thiol-Michael Addition and Carbomers. ACS Biomater Sci Eng 2024; 10:3343-3354. [PMID: 38695560 DOI: 10.1021/acsbiomaterials.3c01755] [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] [Indexed: 05/14/2024]
Abstract
Moldable tissue-sealant hydrogels were developed herein by combining the yield stress fluidity of a Carbomer and in situ cross-linking of 3-arm PEG-thiol (PEG-SH) and 4-arm PEG-acrylate (PEG-AC). The Carbomer was mixed with each PEG oligomer to form two aqueous precursors: Carbomer/PEG-SH and Carbomer/PEG-AC. The two hydrogel precursors exhibited sufficient yield stress (>100 Pa) to prevent dripping from their placement on the tissue surface. Moreover, these hydrogel precursors exhibited rapid restructuring when the shear strain was repeatedly changed. These rheological properties contribute to the moldability of these hydrogel precursors. After mixing these two precursors, they were converted from yield-stress fluids to chemically cross-linked hydrogels, Carbomer/PEG hydrogel, via thiol-Michael addition. The gelation time was 5.0 and 11.2 min at 37 and 25 °C, respectively. In addition, the Carbomer/PEG hydrogels exhibited higher cellular viability than the pure Carbomer. They also showed stable adhesiveness and burst pressure resistance to various tissues, such as the skin, stomach, colon, and cecum of pigs. The hydrogels showed excellent tissue sealing in a cecum ligation and puncture model in mice and improved the survival rate due to their tissue adhesiveness and biocompatibility. The Carbomer/PEG hydrogel is a potential biocompatible tissue sealant that surgeons can mold. It was revealed that the combination of in situ cross-linkable PEG oligomers and yield stress fluid such as Carbomer is effective for developing the moldable tissue sealant without dripping of its hydrogel precursors.
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Affiliation(s)
- Kento Mitsuhashi
- Center for Disease Biology and Integrative Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Natsuko F Inagaki
- Center for Disease Biology and Integrative Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Taichi Ito
- Center for Disease Biology and Integrative Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Zhao L, Zhou Y, Zhang J, Liang H, Chen X, Tan H. Natural Polymer-Based Hydrogels: From Polymer to Biomedical Applications. Pharmaceutics 2023; 15:2514. [PMID: 37896274 PMCID: PMC10610124 DOI: 10.3390/pharmaceutics15102514] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 10/13/2023] [Accepted: 10/19/2023] [Indexed: 10/29/2023] Open
Abstract
Hydrogels prepared from natural polymer have attracted extensive attention in biomedical fields such as drug delivery, wound healing, and regenerative medicine due to their good biocompatibility, degradability, and flexibility. This review outlines the commonly used natural polymer in hydrogel preparation, including cellulose, chitosan, collagen/gelatin, alginate, hyaluronic acid, starch, guar gum, agarose, and dextran. The polymeric structure and process/synthesis of natural polymers are illustrated, and natural polymer-based hydrogels including the hydrogel formation and properties are elaborated. Subsequently, the biomedical applications of hydrogels based on natural polymer in drug delivery, tissue regeneration, wound healing, and other biomedical fields are summarized. Finally, the future perspectives of natural polymers and hydrogels based on them are discussed. For natural polymers, novel technologies such as enzymatic and biological methods have been developed to improve their structural properties, and the development of new natural-based polymers or natural polymer derivatives with high performance is still very important and challenging. For natural polymer-based hydrogels, novel hydrogel materials, like double-network hydrogel, multifunctional composite hydrogels, and hydrogel microrobots have been designed to meet the advanced requirements in biomedical applications, and new strategies such as dual-cross-linking, microfluidic chip, micropatterning, and 3D/4D bioprinting have been explored to fabricate advanced hydrogel materials with designed properties for biomedical applications. Overall, natural polymeric hydrogels have attracted increasing interest in biomedical applications, and the development of novel natural polymer-based materials and new strategies/methods for hydrogel fabrication are highly desirable and still challenging.
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Affiliation(s)
- Lingling Zhao
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Yifan Zhou
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Jiaying Zhang
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
- Center for Child Care and Mental Health (CCCMH), Shenzhen Children’s Hospital, Shenzhen 518038, China
| | - Hongze Liang
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Xianwu Chen
- The Affiliated Hospital of Medical School, Ningbo University, Ningbo 315211, China
| | - Hui Tan
- Center for Child Care and Mental Health (CCCMH), Shenzhen Children’s Hospital, Shenzhen 518038, China
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Pan Q, Tsuji Y, Sreedevi Madhavikutty A, Ohta S, Fujisawa A, Inagaki NF, Fujishiro M, Ito T. Prevention of esophageal stenosis via in situ cross-linkable alginate/gelatin powder in a new submucosal exfoliation model in rats. Biomater Sci 2023; 11:6781-6789. [PMID: 37614197 DOI: 10.1039/d3bm00887h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Abstract
Endoscopic submucosal dissection (ESD) for the treatment of esophageal mucosal lesions often leads to postoperative stenosis, causing difficulty in swallowing, known as dysphagia. In this study, we developed an in situ cross-linkable powder composed of alginate, gelatin, transglutaminase (TG), and calcium chloride ions (Ca2+), which can be administered through a 1.5 m-long and 3.2 mm-diameter endoscopic instrument channel. The powdered mixture of alginate and gelatin quickly formed a hydrogel by absorbing body fluids and was cross-linked by TG and Ca2+, which adhered ex vivo to porcine submucosal layers for over 2 weeks. In addition, we developed a new submucosal exfoliation model in rats that induced severe stenosis, similar to the ESD-induced stenosis models in clinical practice. When administered to the new rat model, the powder system effectively reduced the severity of esophageal stenosis based on body weight change monitoring, anatomical findings, and histological analysis. The body weight of the rats was maintained at the initial weight on postoperative day 14 (POD14), and epithelialization on POD7 and 14 improved to almost 100%. Additionally, collagen accumulation and the number of α-SMA-positive cells decreased due to powder administration. Therefore, these findings indicate that the in situ cross-linkable powder can prevent esophageal stenosis after ESD.
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Affiliation(s)
- Qi Pan
- Center for Disease Biology and Integrative Medicine, School of Medicine, the University of Tokyo, Japan.
| | - Yosuke Tsuji
- Department of Gastroenterology, School of Medicine, the University of Tokyo, Japan
| | | | - Seiichi Ohta
- Center for Disease Biology and Integrative Medicine, School of Medicine, the University of Tokyo, Japan.
- Institute of Engineering Innovation, School of Engineering, the University of Tokyo, Japan
- Department of Bioengineering, School of Engineering, the University of Tokyo, Japan
| | - Ayano Fujisawa
- Department of Bioengineering, School of Engineering, the University of Tokyo, Japan
| | - Natsuko F Inagaki
- Center for Disease Biology and Integrative Medicine, School of Medicine, the University of Tokyo, Japan.
| | - Mitsuhiro Fujishiro
- Department of Gastroenterology, School of Medicine, the University of Tokyo, Japan
| | - Taichi Ito
- Center for Disease Biology and Integrative Medicine, School of Medicine, the University of Tokyo, Japan.
- Department of Chemical System Engineering, School of Engineering, the University of Tokyo, Japan
- Department of Bioengineering, School of Engineering, the University of Tokyo, Japan
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Li W, Wu Y, Zhang X, Wu T, Huang K, Wang B, Liao J. Self-healing hydrogels for bone defect repair. RSC Adv 2023; 13:16773-16788. [PMID: 37283866 PMCID: PMC10240173 DOI: 10.1039/d3ra01700a] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Accepted: 05/24/2023] [Indexed: 06/08/2023] Open
Abstract
Severe bone defects can be caused by various factors, such as tumor resection, severe trauma, and infection. However, bone regeneration capacity is limited up to a critical-size defect, and further intervention is required. Currently, the most common clinical method to repair bone defects is bone grafting, where autografts are the "gold standard." However, the disadvantages of autografts, including inflammation, secondary trauma and chronic disease, limit their application. Bone tissue engineering (BTE) is an attractive strategy for repairing bone defects and has been widely researched. In particular, hydrogels with a three-dimensional network can be used as scaffolds for BTE owing to their hydrophilicity, biocompatibility, and large porosity. Self-healing hydrogels respond rapidly, autonomously, and repeatedly to induced damage and can maintain their original properties (i.e., mechanical properties, fluidity, and biocompatibility) following self-healing. This review focuses on self-healing hydrogels and their applications in bone defect repair. Moreover, we discussed the recent progress in this research field. Despite the significant existing research achievements, there are still challenges that need to be addressed to promote clinical research of self-healing hydrogels in bone defect repair and increase the market penetration.
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Affiliation(s)
- Weiwei Li
- State Key Laboratory of Oral Diseases, National Clinical Research Centre for Oral Diseases, West China Hospital of Stomatology, Sichuan University Chengdu 610041 China
| | - Yanting Wu
- State Key Laboratory of Oral Diseases, National Clinical Research Centre for Oral Diseases, West China Hospital of Stomatology, Sichuan University Chengdu 610041 China
| | - Xu Zhang
- State Key Laboratory of Oral Diseases, National Clinical Research Centre for Oral Diseases, West China Hospital of Stomatology, Sichuan University Chengdu 610041 China
| | - Tingkui Wu
- Department of Orthopedics, Orthopedic Research Institute, West China Hospital, Sichuan University Chengdu 610041 China
| | - Kangkang Huang
- Department of Orthopedics, Orthopedic Research Institute, West China Hospital, Sichuan University Chengdu 610041 China
| | - Beiyu Wang
- Department of Orthopedics, Orthopedic Research Institute, West China Hospital, Sichuan University Chengdu 610041 China
| | - Jinfeng Liao
- State Key Laboratory of Oral Diseases, National Clinical Research Centre for Oral Diseases, West China Hospital of Stomatology, Sichuan University Chengdu 610041 China
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