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Liu S, Dicker KT, Jia X. Modular and orthogonal synthesis of hybrid polymers and networks. Chem Commun (Camb) 2015; 51:5218-37. [PMID: 25572255 PMCID: PMC4359094 DOI: 10.1039/c4cc09568e] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Biomaterials scientists strive to develop polymeric materials with distinct chemical make-up, complex molecular architectures, robust mechanical properties and defined biological functions by drawing inspirations from biological systems. Salient features of biological designs include (1) repetitive presentation of basic motifs; and (2) efficient integration of diverse building blocks. Thus, an appealing approach to biomaterials synthesis is to combine synthetic and natural building blocks in a modular fashion employing novel chemical methods. Over the past decade, orthogonal chemistries have become powerful enabling tools for the modular synthesis of advanced biomaterials. These reactions require building blocks with complementary functionalities, occur under mild conditions in the presence of biological molecules and living cells and proceed with high yield and exceptional selectivity. These chemistries have facilitated the construction of complex polymers and networks in a step-growth fashion, allowing facile modulation of materials properties by simple variations of the building blocks. In this review, we first summarize features of several types of orthogonal chemistries. We then discuss recent progress in the synthesis of step growth linear polymers, dendrimers and networks that find application in drug delivery, 3D cell culture and tissue engineering. Overall, orthogonal reactions and modulular synthesis have not only minimized the steps needed for the desired chemical transformations but also maximized the diversity and functionality of the final products. The modular nature of the design, combined with the potential synergistic effect of the hybrid system, will likely result in novel hydrogel matrices with robust structures and defined functions.
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Affiliation(s)
- Shuang Liu
- Department of Materials Science and Engineering, University of Delaware, 201 DuPont Hall, Newark, DE 19716, USA.
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Monteiro IP, Gabriel D, Timko BP, Hashimoto M, Karajanagi S, Tong R, Marques AP, Reis RL, Kohane DS. A two-component pre-seeded dermal-epidermal scaffold. Acta Biomater 2014; 10:4928-4938. [PMID: 25192821 PMCID: PMC4254066 DOI: 10.1016/j.actbio.2014.08.029] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2014] [Revised: 08/18/2014] [Accepted: 08/25/2014] [Indexed: 12/14/2022]
Abstract
We have developed a bilayered dermal-epidermal scaffold for application in the treatment of full-thickness skin defects. The dermal component gels in situ and adapts to the lesion shape, delivering human dermal fibroblasts in a matrix of fibrin and cross-linked hyaluronic acid modified with a cell adhesion-promoting peptide. Fibroblasts were able to form a tridimensional matrix due to material features such as tailored mechanical properties, presence of protease-degradable elements and cell-binding ligands. The epidermal component is a robust membrane containing cross-linked hyaluronic acid and poly-l-lysine, on which keratinocytes were able to attach and to form a monolayer. Amine-aldehyde bonding at the interface between the two components allows the formation of a tightly bound composite scaffold. Both parts of the scaffold were designed to provide cell-type-specific cues to allow for cell proliferation and form a construct that mimics the skin environment.
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Affiliation(s)
- I P Monteiro
- Laboratory for Biomaterials and Drug Delivery, Department of Anesthesiology, Division of Critical Care Medicine, Children's Hospital Boston, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA; Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA; 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, 4806-909 Taipas, Guimarães, Portugal; ICVS/3B's - PT Government Associate Laboratory University of Minho, Braga/Guimarães, Portugal
| | - D Gabriel
- Laboratory for Biomaterials and Drug Delivery, Department of Anesthesiology, Division of Critical Care Medicine, Children's Hospital Boston, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA; Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - B P Timko
- Laboratory for Biomaterials and Drug Delivery, Department of Anesthesiology, Division of Critical Care Medicine, Children's Hospital Boston, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA; Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - M Hashimoto
- Laboratory for Biomaterials and Drug Delivery, Department of Anesthesiology, Division of Critical Care Medicine, Children's Hospital Boston, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA; Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - S Karajanagi
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA; Department of Surgery, Massachusetts General Hospital, Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA
| | - R Tong
- Laboratory for Biomaterials and Drug Delivery, Department of Anesthesiology, Division of Critical Care Medicine, Children's Hospital Boston, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA; Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - A P Marques
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, 4806-909 Taipas, Guimarães, Portugal; ICVS/3B's - PT Government Associate Laboratory University of Minho, Braga/Guimarães, Portugal
| | - R L Reis
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, 4806-909 Taipas, Guimarães, Portugal; ICVS/3B's - PT Government Associate Laboratory University of Minho, Braga/Guimarães, Portugal
| | - D S Kohane
- Laboratory for Biomaterials and Drug Delivery, Department of Anesthesiology, Division of Critical Care Medicine, Children's Hospital Boston, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA; Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
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53
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Lan S, Jou I, Wu P, Wu C, Chen S. Investigation into the safety of perineural application of 1,4‐butanediol diglycidyl ether‐crosslinked hyaluronan in a rat model. J Biomed Mater Res B Appl Biomater 2014; 103:718-26. [DOI: 10.1002/jbm.b.33251] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2013] [Revised: 05/25/2014] [Accepted: 06/20/2014] [Indexed: 01/23/2023]
Affiliation(s)
- Sheng‐Min Lan
- Institute of Clinical MedicineNational Cheng Kung University No.1, University Road, Tainan 70101 Taiwan
| | - I‐Ming Jou
- Department of OrthopaedicsCollege of Medicine, National Cheng‐Kung University Tainan70428 Taiwan
| | - Po‐Ting Wu
- Department of OrthopaedicsCollege of Medicine, National Cheng‐Kung University Tainan70428 Taiwan
| | - Cheng‐Yi Wu
- Department of OrthopaedicsChia Yi Christian Hospital Chia Yi Taiwan
| | - Sung‐Ching Chen
- R&D DivisionDirection Maxigen Biotech Inc., Wugu District New Taipei City248 Taiwan
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Monteiro IP, Shukla A, Marques AP, Reis RL, Hammond PT. Spray-assisted layer-by-layer assembly on hyaluronic acid scaffolds for skin tissue engineering. J Biomed Mater Res A 2014; 103:330-40. [PMID: 24659574 DOI: 10.1002/jbm.a.35178] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Revised: 03/11/2014] [Accepted: 03/19/2014] [Indexed: 01/12/2023]
Abstract
Tissue engineering approaches for the development of a single epidermal-dermal scaffold to treat full-thickness skin defects have been limited by difficulties in the fabrication of a bilayer scaffold combining the specific properties of the epidermis and the dermis. Here we present an innovative approach to developing a scaffold that holds promise for skin tissue engineering. We utilize the spray-assisted layer-by-layer assembly technique to deposit a polyelectrolyte multilayer film composed of hyaluronic acid and poly-L-lysine (the epidermal component) on a porous hyaluronic acid scaffold (the dermal component), in a rapid and controlled manner. The multilayer film promotes cell adhesion, contributing to regeneration of the epidermal barrier functions of skin. While human keratinocytes attached and proliferated on the coated porous scaffolds, they did not invade the porous dermal component, thus leaving room for seeding of relevant fibroblast cell types in this scaffold. This scaffold therefore holds promise for co-culture of different cells, which may be useful for treatment of full-thickness skin defects as well as other tissue engineering applications.
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Affiliation(s)
- Isa P Monteiro
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts, 02139; 3B's Research Group, Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, 4806-909 Caldas das Taipas, Guimarães, Portugal; ICVS/3B's, PT Government Associate Laboratory, Braga/Guimarães, Portugal
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Stenfelt S, Hulsart-Billström G, Gedda L, Bergman K, Hilborn J, Larsson S, Bowden T. Pre-incubation of chemically crosslinked hyaluronan-based hydrogels, loaded with BMP-2 and hydroxyapatite, and its effect on ectopic bone formation. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2014; 25:1013-1023. [PMID: 24477873 DOI: 10.1007/s10856-014-5147-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Accepted: 01/10/2014] [Indexed: 06/03/2023]
Abstract
The effects of pre-incubation of hyaluronan hydrogels, for different lengths of time after the initiation of chemical crosslinking and prior to injection, were explored both by investigating the in vitro BMP-2 release kinetics from the hydrogel and by studying the ectopic bone formation in rats. From the curing profile, obtained from rheological analysis, appropriate pre-incubation times (1 min, 5 h and 3 days) were selected, to prepare slightly, moderately and fully cured hydrogels. Comparable release profiles were observed for all three test groups in vitro. Furthermore, radiography, pQCT and histology of the explanted grafts showed cancellous bone formation in all groups after 5 weeks in vivo. However, longer pre-incubation times gave rise to an increase in bone volume, but a decrease in bone density. Moreover, the 5 h and the 3 days grafts appeared to be more ordered and resistant to deformation from the surrounding tissue than the 1 min grafts. The observed variations in mechanical and biological properties could potentially be used to adapt the treatment for a specific indication.
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Affiliation(s)
- Sonya Stenfelt
- Department of Chemistry - Ångström Laboratory, Uppsala University, Box 538, 751 21, Uppsala, Sweden
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Jiang Y, Chen J, Deng C, Suuronen EJ, Zhong Z. Click hydrogels, microgels and nanogels: emerging platforms for drug delivery and tissue engineering. Biomaterials 2014; 35:4969-85. [PMID: 24674460 DOI: 10.1016/j.biomaterials.2014.03.001] [Citation(s) in RCA: 476] [Impact Index Per Article: 47.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Accepted: 03/03/2014] [Indexed: 02/06/2023]
Abstract
Hydrogels, microgels and nanogels have emerged as versatile and viable platforms for sustained protein release, targeted drug delivery, and tissue engineering due to excellent biocompatibility, a microporous structure with tunable porosity and pore size, and dimensions spanning from human organs, cells to viruses. In the past decade, remarkable advances in hydrogels, microgels and nanogels have been achieved with click chemistry. It is a most promising strategy to prepare gels with varying dimensions owing to its high reactivity, superb selectivity, and mild reaction conditions. In particular, the recent development of copper-free click chemistry such as strain-promoted azide-alkyne cycloaddition, radical mediated thiol-ene chemistry, Diels-Alder reaction, tetrazole-alkene photo-click chemistry, and oxime reaction renders it possible to form hydrogels, microgels and nanogels without the use of potentially toxic catalysts or immunogenic enzymes that are commonly required. Notably, unlike other chemical approaches, click chemistry owing to its unique bioorthogonal feature does not interfere with encapsulated bioactives such as living cells, proteins and drugs and furthermore allows versatile preparation of micropatterned biomimetic hydrogels, functional microgels and nanogels. In this review, recent exciting developments in click hydrogels, microgels and nanogels, as well as their biomedical applications such as controlled protein and drug release, tissue engineering, and regenerative medicine are presented and discussed.
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Affiliation(s)
- Yanjiao Jiang
- Biomedical Polymers Laboratory, and Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People's Republic of China
| | - Jing Chen
- Biomedical Polymers Laboratory, and Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People's Republic of China
| | - Chao Deng
- Biomedical Polymers Laboratory, and Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People's Republic of China.
| | - Erik J Suuronen
- Division of Cardiac Surgery, University of Ottawa Heart Institute, Ottawa K1Y 4W7, Canada
| | - Zhiyuan Zhong
- Biomedical Polymers Laboratory, and Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People's Republic of China.
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Multivesicular liposomal bupivacaine at the sciatic nerve. Biomaterials 2014; 35:4557-64. [PMID: 24612918 DOI: 10.1016/j.biomaterials.2014.02.015] [Citation(s) in RCA: 90] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Accepted: 02/09/2014] [Indexed: 11/21/2022]
Abstract
Clinical translation of sustained release formulations for local anesthetics has been limited by adverse tissue reaction. Exparel™ (DepoFoam bupivacaine) is a new liposomal local anesthetic formulation whose biocompatibility near nerve tissue is not well characterized. Exparel™ injection caused sciatic nerve blockade in rats lasting 240 min compared to 120 min for 0.5% (w/v) bupivacaine HCl and 210 min for 1.31% (w/v) bupivacaine HCl (same bupivacaine content as Exparel™). On histologic sections four days after injection, median inflammation scores in the Exparel™ group (2.5 of 4) were slightly higher than in groups treated with bupivacaine solutions (score 2). Myotoxicity scores in the Exparel™ group (2.5 of 6) were similar to in the 0.5% (w/v) bupivacaine HCl group (3), but significantly less than in the 1.31% (w/v) bupivacaine HCl group (5). After two weeks, inflammation from Exparel™ (score 2 of 6) was greater than from 0.5% (w/v) bupivacaine HCl (1) and similar to that from 1.31% (w/v) bupivacaine HCl (1). Myotoxicity in all three groups was not statistically significantly different. No neurotoxicity was detected in any group. Tissue reaction to Exparel™ was similar to that of 0.5% (w/v) bupivacaine HCl. Surveillance for local tissue injury will be important during future clinical evaluation.
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Chen P, Zhu S, Wang Y, Mu Q, Wu Y, Xia Q, Zhang X, Sun H, Tao J, Hu H, Lu P, Ouyang H. The amelioration of cartilage degeneration by ADAMTS-5 inhibitor delivered in a hyaluronic acid hydrogel. Biomaterials 2014; 35:2827-36. [PMID: 24424207 DOI: 10.1016/j.biomaterials.2013.12.076] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Accepted: 12/20/2013] [Indexed: 12/19/2022]
Abstract
Degradation of proteoglycan is the key early event in the development of osteoarthritis (OA). The aggrecanase ADAMTS-5 has been identified as the major enzyme responsible for the degradation and thus is an attractive therapeutic target for OA. However, currently there is no report on using an ADAMTS-5 inhibition strategy for OA treatment. The present study aimed to investigate the synergic effect of combining an ADAMTS-5 inhibitor (114810) with a hyaluronic acid hydrogel (HAX) for OA therapeutics. Two OA models were induced by surgically creating an osteochondral defect or removing the anterior cruciate ligament (ACL) in Sprague-Dawley rats. Human OA cartilage was obtained from total joint replacement patients. Both human and rat OA cartilage showed marked proteoglycan loss with significantly increased ADAMTS-5 expression. The effectiveness of ADAMTS-5 inhibition by 114810 was confirmed by a cartilage explants assay in vitro, which showed that the 114810 halted the aggrecanase-mediated (374)ARGS neoepitope released from aggrecan induced by IL-1β stimulation. The in vivo effect of ADAMTS-5 inhibition was assessed by the articular injection of HAX with 114810 into OA knee joints. Evaluated eight weeks after injection, 114810 with HAX significantly promoted the in vivo cartilage healing in the osteochondral defect model, and prevented the progression of degenerative changes in the ACL model. Our results confirmed that ADAMTS-5 is an effective target for OA treatment, and the intra-articular injection of an ADAMTS-5 inhibitor within HAX gel could be a promising strategy for OA treatment.
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Affiliation(s)
- Pengfei Chen
- Center for Stem Cell and Tissue Engineering, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Lab for Tissue Engineering and Regenerative Medicine, Hangzhou, China
| | - Shouan Zhu
- Center for Stem Cell and Tissue Engineering, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Lab for Tissue Engineering and Regenerative Medicine, Hangzhou, China
| | - Yanyan Wang
- Center for Stem Cell and Tissue Engineering, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Lab for Tissue Engineering and Regenerative Medicine, Hangzhou, China
| | - Qin Mu
- Center for Stem Cell and Tissue Engineering, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Lab for Tissue Engineering and Regenerative Medicine, Hangzhou, China
| | - Yan Wu
- Center for Stem Cell and Tissue Engineering, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Lab for Tissue Engineering and Regenerative Medicine, Hangzhou, China
| | - Qingqing Xia
- Center for Stem Cell and Tissue Engineering, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Lab for Tissue Engineering and Regenerative Medicine, Hangzhou, China
| | - Xiaolei Zhang
- Center for Stem Cell and Tissue Engineering, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Lab for Tissue Engineering and Regenerative Medicine, Hangzhou, China
| | - Heng Sun
- Center for Stem Cell and Tissue Engineering, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Lab for Tissue Engineering and Regenerative Medicine, Hangzhou, China
| | - Jiadong Tao
- Center for Stem Cell and Tissue Engineering, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Lab for Tissue Engineering and Regenerative Medicine, Hangzhou, China
| | - Hu Hu
- Department of Pathology and Pathophysiology, School of Medicine, Zhejiang University, Hangzhou, China
| | - Ping Lu
- Center for Stem Cell and Tissue Engineering, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Lab for Tissue Engineering and Regenerative Medicine, Hangzhou, China.
| | - Hongwei Ouyang
- Center for Stem Cell and Tissue Engineering, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Lab for Tissue Engineering and Regenerative Medicine, Hangzhou, China.
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Thiele J, Ma Y, Bruekers SMC, Ma S, Huck WTS. 25th anniversary article: Designer hydrogels for cell cultures: a materials selection guide. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2014; 26:125-47. [PMID: 24227691 DOI: 10.1002/adma.201302958] [Citation(s) in RCA: 290] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Revised: 07/31/2013] [Indexed: 05/25/2023]
Abstract
Cell culturing, whether for tissue engineering or cell biology studies, always involves placing cells in a non-natural environment and no material currently exist that can mimic the entire complexity of natural tissues and variety of cell-matrix interactions that is found in vivo. Here, we review the vast range of hydrogels, composed of natural or synthetic polymers that provide a route to tailored microenvironments.
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Affiliation(s)
- Julian Thiele
- Institute for Molecules and Materials, Heyendaalseweg 135, 6525, AJ, Nijmegen, The Netherlands
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60
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McAlvin JB, Kohane DS. Prolonged Duration Local Anesthesia. ADVANCES IN DELIVERY SCIENCE AND TECHNOLOGY 2014. [DOI: 10.1007/978-1-4614-9434-8_28] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Cohen B, Shefy-Peleg A, Zilberman M. Novel gelatin/alginate soft tissue adhesives loaded with drugs for pain management: structure and properties. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2013; 25:224-40. [DOI: 10.1080/09205063.2013.849904] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Bio-inspired encapsulation and functionalization of living cells with artificial shells. Colloids Surf B Biointerfaces 2013; 113:483-500. [PMID: 24120320 DOI: 10.1016/j.colsurfb.2013.09.024] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Revised: 09/11/2013] [Accepted: 09/13/2013] [Indexed: 12/25/2022]
Abstract
In nature, most single cells do not have structured shells to provide extensive protection apart from diatoms and radiolarians. Fabrication of biomimetic structures based on living cells encapsulated with artificial shells has a great impact on the area of cell-based sensors and devices as well as fundamental studies in cell biology. The past decade has witnessed a rapid increase of research concerning the new fabrication strategies, functionalization and applications of this kind of encapsulated cells. In this review, the latest fabrication strategies on how to encapsulate living cells with functional shells based on the diversity of artificial shells are discussed: hydrogel matrix shells, sol-gel shells, polymeric shells, and induced mineral shells. Classical different types of artificial shells are introduced and their advantages and disadvantages are compared and explained. The biomedical applications of encapsulated cells with particular emphasis on cell implant protection, cell separation, biosensors, cell therapy and tissue engineering are also described and a recap of this review and the future perspectives on these active areas is given finally.
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Takahashi A, Suzuki Y, Suhara T, Omichi K, Shimizu A, Hasegawa K, Kokudo N, Ohta S, Ito T. In Situ Cross-Linkable Hydrogel of Hyaluronan Produced via Copper-Free Click Chemistry. Biomacromolecules 2013; 14:3581-8. [DOI: 10.1021/bm4009606] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Akira Takahashi
- Department
of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Yukimitsu Suzuki
- Department
of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Takashi Suhara
- Department
of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | | | | | | | | | | | - Taichi Ito
- Department
of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Lu L, Zhang W, Wu X, Wang X, Zhang M, Zhu Q, Ding X, Xu Z, Gao S, Gao J. A novel ropivacaine-loaded in situ forming implant prolongs the effect of local analgesia in rats. Arch Med Sci 2013; 9:614-21. [PMID: 24049519 PMCID: PMC3776163 DOI: 10.5114/aoms.2012.30829] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2011] [Revised: 01/25/2012] [Accepted: 02/20/2012] [Indexed: 11/25/2022] Open
Abstract
INTRODUCTION Prolonged postoperative analgesia cannot be achieved by a single injection of local anesthetic solution. The objective of this study was to optimize the formulation of a ropivacaine hydrochloride (Ropi-HCl) loaded in situ forming implant (ISI) by addition of different co-solvents, and evaluate the in vitro release of Ropi-HCl, and the analgesic effect and toxicity of the optimized formulation in rats. MATERIAL AND METHODS Triacetin (TA), benzyl benzoate (BB) and polyethylene glycol 400 (PEG 400) were used as additives and added to the solvent of N-methyl-2-pyrrolidone (NMP). Drug release to the surface and inner structural properties of the formed implant were evaluated by scanning electron microscopy (SEM). The analgesic effect was determined by injection near the rat sciatic nerve. RESULTS The solvent system added with TA or BB significantly decreased the burst release, whereas PEG 400 increased the Ropi-HCl burst release from the formulation. Over 70% of the incorporated Ropi-HCl was released from all formulations in 14 days in the in vitro assay. The SEM showed that the surface of NMP-BB formulation was less porous and more homogeneous, compared with the other formulations. Compared with Ropi-HCl injection, the optimized formulation (NMP-BB) significantly prolonged the analgesic effect in 48 h (p < 0.05), with a mild degree of motor block from 3 h to 12 h. Histological evaluation of the injection site revealed only mild inflammatory infiltration without obvious pathological nerve alterations. CONCLUSIONS The biodegradable Ropi-HCl-loaded ISI system with NMP-BB may prove to be an attractive and safe alternative for the delivery of parenteral local anesthetics to prolong pain relief.
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Affiliation(s)
- Lei Lu
- Department of Pharmaceutics, Changhai Hospital, Second Military Medical University, Shanghai, PR China
- Department of Pharmaceutics, PLA No. 323 Hospital, Xi'an, Shaanxi, PR China
| | - Wei Zhang
- Department of Pharmaceutics, Changhai Hospital, Second Military Medical University, Shanghai, PR China
- Department of Pharmaceutics, PLA No. 522 Hospital, Luoyang, Henan, PR China
| | - Xin Wu
- Department of Pharmaceutics, Changhai Hospital, Second Military Medical University, Shanghai, PR China
| | - Xiaoyu Wang
- Department of Pharmaceutics, Changhai Hospital, Second Military Medical University, Shanghai, PR China
| | - Min Zhang
- Department of Pharmaceutics, Changhai Hospital, Second Military Medical University, Shanghai, PR China
| | - Quangang Zhu
- Department of Pharmaceutics, Changhai Hospital, Second Military Medical University, Shanghai, PR China
| | - Xueying Ding
- Department of Pharmaceutics, School of Pharmacy, Second Military Medical University, Shanghai, PR China
| | - Zhiyun Xu
- Department of Thoracic-Cardio Surgery, Changhai Hospital, Second Military Medical University, Shanghai, PR China
| | - Shen Gao
- Department of Pharmaceutics, Changhai Hospital, Second Military Medical University, Shanghai, PR China
| | - Jing Gao
- Department of Pharmaceutics, School of Pharmacy, Second Military Medical University, Shanghai, PR China
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66
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Emoto S, Yamaguchi H, Kamei T, Ishigami H, Suhara T, Suzuki Y, Ito T, Kitayama J, Watanabe T. Intraperitoneal administration of cisplatin via an in situ cross-linkable hyaluronic acid-based hydrogel for peritoneal dissemination of gastric cancer. Surg Today 2013; 44:919-26. [PMID: 23887848 DOI: 10.1007/s00595-013-0674-6] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Accepted: 03/04/2013] [Indexed: 12/11/2022]
Abstract
PURPOSE To develop a drug-delivery system for the prolonged retention of intraperitoneally (i.p.) administered cisplatin (CDDP) to deliver intraperitoneal chemotherapy against peritoneal carcinomatosis effectively. METHODS CDDP was encapsulated inside an in situ cross-linkable hyaluronic acid (HA)-based hydrogel. The gelation and degradation kinetics of the hydrogel and the release kinetics of CDDP were investigated in vitro, and the antitumor effect was investigated in a mouse model of peritoneal dissemination of human gastric cancer. RESULTS The gelation time varied according to the concentration of two polymers: HA-adipic dihydrazide and HA-aldehyde. CDDP was released from the hydrogel for more than 4 days. A cell proliferation assay showed that the polymers themselves were not cytotoxic toward MKN45P, a human gastric cancer cell line. By mixing the two polymers in the peritoneum, in situ gelation was achieved. The weight of peritoneal nodules decreased in the hydrogel-conjugated CDDP group, whereas no significant antitumor effect was observed in the free CDDP group. CONCLUSIONS In situ cross-linkable HA hydrogels represent a promising biomaterial to prolong the retention and sustain the release of intraperitoneally administered CDDP in the peritoneal cavity and to enhance its antitumor effects against peritoneal dissemination.
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Affiliation(s)
- Shigenobu Emoto
- Department of Surgical Oncology, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan,
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Sestak J, Mullins M, Northrup L, Thati S, Siahaan T, Berkland C. Single-step grafting of aminooxy-peptides to hyaluronan: a simple approach to multifunctional therapeutics for experimental autoimmune encephalomyelitis. J Control Release 2013; 168:334-40. [PMID: 23541930 PMCID: PMC3672265 DOI: 10.1016/j.jconrel.2013.03.015] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Accepted: 03/19/2013] [Indexed: 01/19/2023]
Abstract
The immune response to antigens is directed in part by the presence or absence of costimulatory signals. The ability to coincidently present both antigen and, for example, a peptide that inhibits or activates the costimulatory pathway, would be a valuable tool for tolerization or immunization, respectively. A simple reaction scheme utilizing oxime chemistry was identified as a means to efficiently conjugate different peptide species to hyaluronan. Peptides synthesized with an aminooxy N-terminus reacted directly to hyaluronan under slightly acidic aqueous conditions without the need for a catalyst. The resulting oxime bond was found to rapidly hydrolyze at pH2 releasing peptide, but was stable at higher pH values (5.5 and 7). Two different peptide species, a multiple sclerosis antigen (PLP) and an ICAM-1 ligand (LABL) known to block immune cell stimulation, were functionalized with the aminooxy end group. These peptides showed similar reactivity to hyaluronan and were conjugated in an equimolar ratio. The resulting hyaluronan with grafted PLP and LABL significantly inhibited disease in mice with experimental autoimmune encephalomyelitis, a model of multiple sclerosis. Aminooxy-peptides facilitate simple synthesis of multifunctional hyaluronan graft polymers, thus enabling novel approaches to antigen-specific immune modulation.
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Affiliation(s)
- Joshua. Sestak
- Department of Pharmaceutical Chemistry, University of Kansas, 2030 Becker Dr, Lawrence, KS 66047
| | - Meagan Mullins
- Department of Pharmaceutical Chemistry, University of Kansas, 2030 Becker Dr, Lawrence, KS 66047
| | - Laura Northrup
- Department of Pharmaceutical Chemistry, University of Kansas, 2030 Becker Dr, Lawrence, KS 66047
| | - Shara Thati
- Department of Pharmaceutical Chemistry, University of Kansas, 2030 Becker Dr, Lawrence, KS 66047
| | - Teruna Siahaan
- Department of Pharmaceutical Chemistry, University of Kansas, 2030 Becker Dr, Lawrence, KS 66047
| | - Cory Berkland
- Department of Pharmaceutical Chemistry, University of Kansas, 2030 Becker Dr, Lawrence, KS 66047
- Department of Chemical and Petroleum Engineering, University of Kansas, 1530 W 15th, Rm 4132 Learned Hall, Lawrence, KS, 66045
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Hulsart-Billström G, Piskounova S, Gedda L, Andersson BM, Bergman K, Hilborn J, Larsson S, Bowden T. Morphological differences in BMP-2-induced ectopic bone between solid and crushed hyaluronan hydrogel templates. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2013; 24:1201-9. [PMID: 23392969 DOI: 10.1007/s10856-013-4877-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Accepted: 01/22/2013] [Indexed: 05/16/2023]
Abstract
The possibility to affect bone formation by using crushed versus solid hydrogels as carriers for bone morphogenetic protein 2 (BMP-2) was studied. Hydrogels, based on chemical crosslinking between hyaluronic acid and poly(vinyl alcohol) derivatives, were loaded with BMP-2 and hydroxyapatite. Crushed and solid forms of the gels were analyzed both in vitro via a release study using ¹²⁵I radioactive labeling of BMP-2, and in vivo in a subcutaneous ectopic bone model in rats. Dramatically different morphologies were observed for the ectopic bone formed in vivo in the two types of gels, even though virtually identical release profiles were observed in vitro. Solid hydrogels induced formation of a dense bone shell around non-degraded hydrogel, while crushed hydrogels demonstrated a uniform bone formation throughout the entire sample. These results suggest that by crushing the hydrogel, the construct's three-dimensional network becomes disrupted. This could expose unreacted functional groups, making the fragment's surfaces reactive and enable limited chemical fusion between the crushed hydrogel fragments, leading to similar in vitro release profiles. However, in vivo these interactions could be broken by enzymatic activity, creating a macroporous structure that allows easier cell infiltration, thus, facilitating bone formation.
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New hepatectomy-induced postoperative adhesion model in rats, and evaluation of the efficacy of anti-adhesion materials. Surg Today 2013; 44:314-23. [PMID: 23504003 DOI: 10.1007/s00595-013-0530-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Accepted: 11/15/2012] [Indexed: 12/19/2022]
Abstract
PURPOSE Repeated hepatic resections are not uncommon during the surgical management of liver tumors. Postoperative adhesions induced by hepatectomies can have a significant negative impact on subsequent surgeries. We recently developed a new hepatectomy-induced postoperative adhesion animal model to evaluate the anti-adhesion efficacy of commercially available sheet materials (Seprafilm(®) and Interceed(®)) and the recently reported hyaluronan-based in situ cross-linkable hydrogels. METHODS The median lobe (ML) and the left lateral lobe (LLL) of the liver (approximately 70 % of the total liver) of 43 male Sprague-Dawley rats were resected based on the classical procedure; anti-adhesion materials were then applied. A relaparotomy was performed 1 week later to evaluate the adhesions and histopathological findings. RESULTS The rats without the application of anti-adhesion materials (n = 14) showed the most severe adhesions (grade 3) between the cut surface of the liver and the small bowel or omentum. All the barrier materials produced slight anti-adhesion effects. Adhesions between the liver surface and the diaphragm and adhesions around the hepatic hilum were less severe, but were not remarkably reduced, by the anti-adhesion materials. CONCLUSION We successfully established a new hepatectomy-induced animal adhesion model, which may be useful for the development of new anti-adhesion materials.
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McAlvin JB, Reznor G, Shankarappa SA, Stefanescu CF, Kohane DS. Local toxicity from local anesthetic polymeric microparticles. Anesth Analg 2013; 116:794-803. [PMID: 23460564 DOI: 10.1213/ane.0b013e31828174a7] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Local tissue injury from sustained-release formulations for local anesthetics can be severe. There is considerable variability in reporting of that injury. We investigated the influence of the intrinsic myotoxicity of the encapsulated local anesthetic (lidocaine, low; bupivacaine, high) on tissue reaction in rats. METHODS Cytotoxicity from a range of lidocaine and bupivacaine concentrations was measured in C2C12 myotubes over 6 days. Rats were given sciatic nerve blocks with 4 microparticulate formulations of lidocaine and bupivacaine: 10% (w/w) lidocaine poly(lactic-co-glycolic) acid (PLGA), 10% (w/w) bupivacaine PLGA, 50% (w/w) lidocaine PLGA, and 50% (w/w) bupivacaine PLGA. Effectiveness of nerve blockade was assessed by a modified hotplate test and weightbearing measurements. Myotoxicity was scored in histologic sections of injection sites. Bupivacaine and lidocaine release kinetics from the particles were measured. RESULTS Median sensory blockade duration for 50% (w/w) lidocaine was 255 (90-540) minutes versus 840 (277-1215) minutes for 50% (w/w) bupivacaine (P = 0.056). All microparticulate formulations resulted in myotoxicity. The choice of local anesthetic did not influence the severity of myotoxicity. Median myotoxicity scores for 50% (w/w) lidocaine compared with 50% (w/w) bupivacaine at 4 days were 3.4 (2.1-4.2) vs 3.3 (2.9-3.5) (P = 0.44) and at 14 days 1.9 (1.8-2.4) vs 1.7 (1.3-1.9) (P = 0.23), respectively. CONCLUSIONS Lidocaine and bupivacaine PLGA microspheres resulted in similar degrees of myotoxicity, irrespective of drug loading. Intrinsic myotoxicity did not predict tissue injury from sustained release of these anesthetics. Caution is warranted in the use of such devices near muscle and nerve.
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Affiliation(s)
- J Brian McAlvin
- Department of Medicine, Medicine Critical Care Program, Children’s Hospital Boston, Harvard Medical School, Boston, MA 02115, USA
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Binauld S, Stenzel MH. Acid-degradable polymers for drug delivery: a decade of innovation. Chem Commun (Camb) 2013; 49:2082-102. [DOI: 10.1039/c2cc36589h] [Citation(s) in RCA: 312] [Impact Index Per Article: 28.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Hulsart-Billström G, Bergman K, Andersson B, Hilborn J, Larsson S, Jonsson KB. A uni-cortical femoral defect model in the rat: evaluation using injectable hyaluronan hydrogel as a carrier for bone morphogenetic protein-2. J Tissue Eng Regen Med 2012; 9:799-807. [PMID: 23225778 DOI: 10.1002/term.1655] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2012] [Revised: 08/10/2012] [Accepted: 10/21/2012] [Indexed: 11/10/2022]
Abstract
The development of biomaterial for bone regeneration requires animal models that are reliable and designed to mimic clinically relevant situations. We have previously investigated hydrogels comprised of modified hyaluronic acid and polyvinyl alcohol in models of ectopic bone formation. This hydrogel induces bone regeneration when loaded with bone morphogenetic proteins (BMPs). To allow further optimization of hydrogels, we developed a new, femoral, non-critical-sized cortical defect model. In the rat femur, we drilled standardized, elongated unilateral cortical defects that did not require stabilization and that could be created bilaterally to allow paired comparisons of biomaterials. After optimizing the defect size, subsequent stress fractures occurred in only 8% and the defect healed partially over the 40 day study period. In a time-course experiment, we treated bone defects with the previously studied hyaluronan hydrogel loaded with 10 µg hydroxyapatite and 6 µg BMP-2. The shape of the defect allowed controlled containment of the material within the defect. The defect in the right leg was left untreated, while the left defect was filled with 40 µl of the BMP hydrogel. As determined by pQCT analysis, the treated defects had a higher bone mineral content, bone area and bone density than control defects. The relative difference was greatest between the groups at 10 and 20 days and diminished as the defect healed in the untreated legs. We conclude that this animal model allows facile and rapid screening of biomaterials for bone regeneration in cortical femoral defects without requiring external fixation.
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Affiliation(s)
- Gry Hulsart-Billström
- Department of Surgical Sciences, Unit of Orthopaedics, Uppsala University, Uppsala, Sweden
| | - Kristoffer Bergman
- Department of Materials Chemistry, Ångström Laboratory Uppsala University, Uppsala, Sweden
| | - Brittmarie Andersson
- Department of Surgical Sciences, Unit of Orthopaedics, Uppsala University, Uppsala, Sweden
| | - Jöns Hilborn
- Department of Materials Chemistry, Ångström Laboratory Uppsala University, Uppsala, Sweden
| | - Sune Larsson
- Department of Surgical Sciences, Unit of Orthopaedics, Uppsala University, Uppsala, Sweden
| | - Kenneth B Jonsson
- Department of Surgical Sciences, Unit of Orthopaedics, Uppsala University, Uppsala, Sweden
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Wang P, Wei ZY, Cheng J, Liu L. Preparation and characterization of a novel hybrid copolymer hydrogel with poly(ethylene glycol) dimethacrylate, 2-hydroxyethyl methacrylate and layered double hydroxides. ACTA ACUST UNITED AC 2012. [DOI: 10.1007/s12204-012-1351-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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74
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Hyaluronan (HA) interacting proteins RHAMM and hyaluronidase impact prostate cancer cell behavior and invadopodia formation in 3D HA-based hydrogels. PLoS One 2012; 7:e50075. [PMID: 23166824 PMCID: PMC3500332 DOI: 10.1371/journal.pone.0050075] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Accepted: 10/15/2012] [Indexed: 11/19/2022] Open
Abstract
To study the individual functions of hyaluronan interacting proteins in prostate cancer (PCa) motility through connective tissues, we developed a novel three-dimensional (3D) hyaluronic acid (HA) hydrogel assay that provides a flexible, quantifiable, and physiologically relevant alternative to current methods. Invasion in this system reflects the prevalence of HA in connective tissues and its role in the promotion of cancer cell motility and tissue invasion, making the system ideal to study invasion through bone marrow or other HA-rich connective tissues. The bio-compatible cross-linking process we used allows for direct encapsulation of cancer cells within the gel where they adopt a distinct, cluster-like morphology. Metastatic PCa cells in these hydrogels develop fingerlike structures, “invadopodia”, consistent with their invasive properties. The number of invadopodia, as well as cluster size, shape, and convergence, can provide a quantifiable measure of invasive potential. Among candidate hyaluronan interacting proteins that could be responsible for the behavior we observed, we found that culture in the HA hydrogel triggers invasive PCa cells to differentially express and localize receptor for hyaluronan mediated motility (RHAMM)/CD168 which, in the absence of CD44, appears to contribute to PCa motility and invasion by interacting with the HA hydrogel components. PCa cell invasion through the HA hydrogel also was found to depend on the activity of hyaluronidases. Studies shown here reveal that while hyaluronidase activity is necessary for invadopodia and inter-connecting cluster formation, activity alone is not sufficient for acquisition of invasiveness to occur. We therefore suggest that development of invasive behavior in 3D HA-based systems requires development of additional cellular features, such as activation of motility associated pathways that regulate formation of invadopodia. Thus, we report development of a 3D system amenable to dissection of biological processes associated with cancer cell motility through HA-rich connective tissues.
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75
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Hoare T, Young S, Lawlor MW, Kohane DS. Thermoresponsive nanogels for prolonged duration local anesthesia. Acta Biomater 2012; 8:3596-605. [PMID: 22732383 DOI: 10.1016/j.actbio.2012.06.013] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Revised: 06/08/2012] [Accepted: 06/08/2012] [Indexed: 11/16/2022]
Abstract
Nanogels based on poly(N-isopropylacrylamide) are attractive vehicles for prolonged duration local anesthesia because of their tunable size, number of functional groups, thermoresponsiveness and anionic charge. Nerve block durations of up to 9h were achieved using acrylic acid-loaded nanogels loaded with bupivacaine. Increasing the anionic charge density of the nanogels or (for more highly acid-functionalized nanogels) decreasing the nanogel size facilitated longer duration of anesthetic release. Small (<300 nm diameter) nanogels formed dense aggregates upon injection in vivo and induced only mild inflammatory responses, while large (>500 nm diameter) nanogels typically remained as liquid-like residues in vivo and induced more severe inflammatory reactions.
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Affiliation(s)
- Todd Hoare
- Department of Chemical Engineering, McMaster University, Hamilton, Ontario, Canada
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76
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Tao Y, Ai L, Bai H, Liu X. Synthesis of pH-responsive photocrosslinked hyaluronic acid-based hydrogels for drug delivery. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/pola.26159] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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77
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Weiniger CF, Golovanevski L, Domb AJ, Ickowicz D. Extended release formulations for local anaesthetic agents. Anaesthesia 2012; 67:906-16. [PMID: 22607613 DOI: 10.1111/j.1365-2044.2012.07168.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Systemic toxicity through overdose of local anaesthetic agents is a real concern. By encapsulating local anaesthetics in biodegradable carriers to produce a system for prolonged release, their duration of action can be extended. This encapsulation should also improve the safety profile of the local anaesthetic as it is released at a slower rate. Work with naturally occurring local anaestheticss has also shown promise in the area of reducing systemic and neurotoxicity. Extended duration local anaesthetic formulations in current development or clinical use include liposomes, hydrophobic based polymer particles such as Poly(lactic-co-glycolic acid) microspheres, pasty injectable and solid polymers like Poly(sebacic-co-ricinoleic acid) P(SA:RA) and their combination with synthetic and natural local anaesthetic. Their duration of action, rationale and limitations are reviewed. Direct comparison of the different agents is limited by their chemical properties, the drug doses encapsulated and the details of in vivo models described.
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Affiliation(s)
- C F Weiniger
- Department of Anesthesiology and Critical Care Medicine, Hadassah Hebrew University Medical Centre, Jerusalem, Israel.
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Wang LS, Chung JE, Kurisawa M. Controlling Fibroblast Proliferation with Dimensionality-Specific Response by Stiffness of Injectable Gelatin Hydrogels. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 23:1793-806. [DOI: 10.1163/156856211x598193] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Li-Shan Wang
- a Institute of Bioengineering and Nanotechnology , 31 Biopolis Way, The Nanos , 138669 , Singapore
| | - Joo Eun Chung
- a Institute of Bioengineering and Nanotechnology , 31 Biopolis Way, The Nanos , 138669 , Singapore
| | - Motoichi Kurisawa
- a Institute of Bioengineering and Nanotechnology , 31 Biopolis Way, The Nanos , 138669 , Singapore
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Li Y, Rodrigues J, Tomás H. Injectable and biodegradable hydrogels: gelation, biodegradation and biomedical applications. Chem Soc Rev 2012; 41:2193-221. [PMID: 22116474 DOI: 10.1039/c1cs15203c] [Citation(s) in RCA: 942] [Impact Index Per Article: 78.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Injectable hydrogels with biodegradability have in situ formability which in vitro/in vivo allows an effective and homogeneous encapsulation of drugs/cells, and convenient in vivo surgical operation in a minimally invasive way, causing smaller scar size and less pain for patients. Therefore, they have found a variety of biomedical applications, such as drug delivery, cell encapsulation, and tissue engineering. This critical review systematically summarizes the recent progresses on biodegradable and injectable hydrogels fabricated from natural polymers (chitosan, hyaluronic acid, alginates, gelatin, heparin, chondroitin sulfate, etc.) and biodegradable synthetic polymers (polypeptides, polyesters, polyphosphazenes, etc.). The review includes the novel naturally based hydrogels with high potential for biomedical applications developed in the past five years which integrate the excellent biocompatibility of natural polymers/synthetic polypeptides with structural controllability via chemical modification. The gelation and biodegradation which are two key factors to affect the cell fate or drug delivery are highlighted. A brief outlook on the future of injectable and biodegradable hydrogels is also presented (326 references).
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Affiliation(s)
- Yulin Li
- CQM-Centro de Química da Madeira, MMRG, Universidade da Madeira, Campus da Penteada 9020-105 Funchal, Portugal.
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Krishna UM, Martinez AW, Caves JM, Chaikof EL. Hydrazone self-crosslinking of multiphase elastin-like block copolymer networks. Acta Biomater 2012; 8:988-97. [PMID: 22154858 DOI: 10.1016/j.actbio.2011.11.024] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2011] [Revised: 11/12/2011] [Accepted: 11/21/2011] [Indexed: 11/29/2022]
Abstract
Biosynthetic strategies for the production of recombinant elastin-like protein (ELP) triblock copolymers have resulted in elastomeric protein hydrogels, formed through rapid physical crosslinking upon warming of concentrated solutions. However, the strength of physically crosslinked networks can be limited, and options for non-toxic chemical crosslinking of these networks are not optimal. In this report, we modify two recombinant elastin-like proteins with aldehyde and hydrazide functionalities. When combined, these modified recombinant proteins self-crosslink through hydrazone bonding without requiring initiators or producing by-products. Crosslinked materials are evaluated for water content and swelling upon hydration, and subject to tensile and compressive mechanical tests. Hydrazone crosslinking is a viable method for increasing the mechanical strength of elastin-like protein polymers, in a manner that is likely to lend itself to the biocompatible in situ formation of chemically and physically crosslinked ELP hydrogels.
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81
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Shichor I, Shomron N, Lawlor MW, Bae SA, Zoldan J, Langer R, Kohane DS. Toxicogenomic analysis of a sustained release local anesthetic delivery system. Biomaterials 2012; 33:3586-93. [PMID: 22341215 DOI: 10.1016/j.biomaterials.2012.01.043] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Accepted: 01/23/2012] [Indexed: 01/24/2023]
Abstract
Concerns over neurotoxicity have impeded the development of sustained release formulations providing prolonged duration local anesthesia (PDLA) from a single injection, for which there is an urgent clinical need. Here, we have used toxicogenomics to investigate whether nerve injury occurred during week-long continuous sciatic nerve blockade by microspheres containing bupivacaine, tetrodotoxin, and dexamethasone (TBD). Animals treated with amitriptyline solution (our positive control for local anesthetic-associated nerve injury) developed irreversible nerve blockade, had severely abnormal nerve histology, and the expression of hundreds of genes was altered in the dorsal root ganglia at 4 and 7 days after injection. In marked contrast, TBD-treated nerves reverted to normal function, were normal histologically and there were changes in the expression of a small number of genes. Toxicogenomic studies have great potential in delineating patterns of gene expression associated with specific patterns of tissue injury (e.g. amitriptyline neurotoxicity), and in identifying related changes in gene expression upon exposure to a drug, biomaterial, or drug delivery system.
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Affiliation(s)
- Iris Shichor
- Laboratory for Biomaterials and Drug Delivery, Department of Anesthesiology, Division of Critical Care Medicine, Children's Hospital, Harvard Medical School, Boston, MA 02115, USA
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Xu X, Jha AK, Harrington DA, Farach-Carson MC, Jia X. Hyaluronic Acid-Based Hydrogels: from a Natural Polysaccharide to Complex Networks. SOFT MATTER 2012; 8:3280-3294. [PMID: 22419946 PMCID: PMC3299088 DOI: 10.1039/c2sm06463d] [Citation(s) in RCA: 360] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Hyaluronic acid (HA) is one of nature's most versatile and fascinating macromolecules. Being an essential component of the natural extracellular matrix (ECM), HA plays an important role in a variety of biological processes. Inherently biocompatible, biodegradable and non-immunogenic, HA is an attractive starting material for the construction of hydrogels with desired morphology, stiffness and bioactivity. While the interconnected network extends to the macroscopic level in HA bulk gels, HA hydrogel particles (HGPs, microgels or nanogels) confine the network to microscopic dimensions. Taking advantage of various scaffold fabrication techniques, HA hydrogels with complex architecture, unique anisotropy, tunable viscoelasticity and desired biologic outcomes have been synthesized and characterized. Physical entrapment and covalent integration of hydrogel particles in a secondary HA network give rise to hybrid networks that are hierarchically structured and mechanically robust, capable of mediating cellular activities through the spatial and temporal presentation of biological cues. This review highlights recent efforts in converting a naturally occurring polysaccharide to drug releasing hydrogel particles, and finally, complex and instructive macroscopic networks. HA-based hydrogels are promising materials for tissue repair and regeneration.
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Affiliation(s)
- Xian Xu
- Department of Materials Science and Engineering, Delaware Biotechnology Institute, University of Delaware, Newark, DE 19716
| | - Amit K. Jha
- Department of Materials Science and Engineering, Delaware Biotechnology Institute, University of Delaware, Newark, DE 19716
| | | | | | - Xinqiao Jia
- Department of Materials Science and Engineering, Delaware Biotechnology Institute, University of Delaware, Newark, DE 19716
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Möller L, Krause A, Bartsch I, Kirschning A, Witte F, Dräger G. Preparation and In Vivo Imaging of Lucifer Yellow Tagged Hydrogels. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/masy.201100045] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Yang JA, Park K, Jung H, Kim H, Hong SW, Yoon SK, Hahn SK. Target specific hyaluronic acid–interferon alpha conjugate for the treatment of hepatitis C virus infection. Biomaterials 2011; 32:8722-9. [DOI: 10.1016/j.biomaterials.2011.07.088] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Accepted: 07/30/2011] [Indexed: 11/27/2022]
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85
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Polymer and Water Dynamics in Poly(vinyl alcohol)/Poly(methacrylate) Networks. A Molecular Dynamics Simulation and Incoherent Neutron Scattering Investigation. Polymers (Basel) 2011. [DOI: 10.3390/polym3041805] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
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Hulsart-Billström G, Hu Q, Bergman K, Jonsson KB, Åberg J, Tang R, Larsson S, Hilborn J. Calcium phosphates compounds in conjunction with hydrogel as carrier for BMP-2: a study on ectopic bone formation in rats. Acta Biomater 2011; 7:3042-9. [PMID: 21569871 DOI: 10.1016/j.actbio.2011.04.021] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2011] [Revised: 03/25/2011] [Accepted: 04/24/2011] [Indexed: 11/29/2022]
Abstract
Current treatment of fractures often involves the use of bone graft or bone morphogenetic proteins (BMP) to induce fracture healing, especially in patients with a compromised healing capacity. BMP has to be delivered in conjunction with a carrier. Unfortunately, there are drawbacks and limitations with current carriers, including their bovine origin which carries the risk of an immunological response. The physical properties also limit the use to open surgical procedures, as it cannot be injected. New carriers with improved properties are therefore needed. The aim of this study was to assess the ectopic bone forming capability of various calcium phosphate compounds when used in conjunction with a hydrogel as the carrier for BMP-2. Five different ceramic additives were tested, including β-tricalcium phosphate and four types of hydroxyapatite (HAP) (nanoHAP, HAP, clods of HAP >100 μm, and the biomimetic HAP Ostim35®). The compounds were injected into the thigh muscle of rats, where it formed a gel in situ. After 4 weeks bone formation was evaluated by peripheral quantitative computed tomography and histology. The major finding was that the 20 nm nanoHAP yielded a higher bone density than the other additives (P=0.0008, ANOVA with Tukey's multiple comparison test). We hypothesize that the higher bone density induced by nanoHAP might be due to nanocrystals of calcium phosphate acting as direct building blocks for biomineralization.
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87
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Schanté CE, Zuber G, Herlin C, Vandamme TF. Chemical modifications of hyaluronic acid for the synthesis of derivatives for a broad range of biomedical applications. Carbohydr Polym 2011. [DOI: 10.1016/j.carbpol.2011.03.019] [Citation(s) in RCA: 434] [Impact Index Per Article: 33.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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88
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Tan H, Rubin JP, Marra KG. Injectable in situ forming biodegradable chitosan-hyaluronic acid based hydrogels for adipose tissue regeneration. Organogenesis 2011; 6:173-80. [PMID: 21197220 DOI: 10.4161/org.6.3.12037] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2010] [Accepted: 04/12/2010] [Indexed: 12/22/2022] Open
Abstract
An injectable, biodegradable and glucose-responsive hydrogel derived from natural polysaccharide derivatives was synthesized to deliver adipogenic factor of insulin in vitro for adipose tissue engineering. The biodegradable hydrogel based N-succinyl-chitosan (SCS) and aldehyde hyaluronic acid (AHA) with covalently conjugated glucose oxidase and catalase. The gelation is attributed to the Schiff-base reaction between amino and aldehyde groups of SCS and AHA, respectively. The morphologies and compressive modulus of the freeze-dried hydrogels demonstrated that the incorporated insulin and enzymes results in the formation of a tighter network structure in composite hydrogels. The immobilized enzymes triggered conversion of glucose reduces the pH value of the microenvironment, and results in hydrolysis and increasing swelling of the network basing on Schiff-base cross-linking. The pH inside the hydrogel, kept in PBS solution at pH 7.4 and 37°C, linearly dropped from 7.40 to 7.17 during 4 h of initial period, then slowly increased to 7.36 after 24 h. Correspondingly, the swelling ratio increased from 20.8 to 28.6 at 37°C in PBS with 500 mg/dL glucose. In PBS buffer with 500 mg/dL glucose, about 10.8% of insulin was released from the hydrogel after 8 h of incubation while upon observation. The results demonstrated that the adipogenic factor of insulin would be released from this biodegradable hydrogel device into the local microenvironment in a controlled fashion by the swelling of hydrogel network. These preliminary studies indicate that the biodegradable and glucose-responsive hydrogel may have potential uses in adipose tissue engineering applications.
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Affiliation(s)
- Huaping Tan
- Division of Plastic Surgery, Department of Surgery, University of Pittsburgh, Pittsburgh, PA, USA
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89
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Choh SY, Cross D, Wang C. Facile Synthesis and Characterization of Disulfide-Cross-Linked Hyaluronic Acid Hydrogels for Protein Delivery and Cell Encapsulation. Biomacromolecules 2011; 12:1126-36. [DOI: 10.1021/bm101451k] [Citation(s) in RCA: 165] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Sun-Young Choh
- Department of Biomedical Engineering, University of Minnesota, 7-105 Hasselmo Hall, 312 Church Street South East, Minneapolis, Minnesota 55455, United States
| | - Daisy Cross
- Department of Biomedical Engineering, University of Minnesota, 7-105 Hasselmo Hall, 312 Church Street South East, Minneapolis, Minnesota 55455, United States
| | - Chun Wang
- Department of Biomedical Engineering, University of Minnesota, 7-105 Hasselmo Hall, 312 Church Street South East, Minneapolis, Minnesota 55455, United States
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90
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Comparison of Neosaxitoxin Versus Bupivacaine via Port Infiltration for Postoperative Analgesia Following Laparoscopic Cholecystectomy. Reg Anesth Pain Med 2011; 36:103-9. [DOI: 10.1097/aap.0b013e3182030662] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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91
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Martínez-Sanz E, Ossipov DA, Hilborn J, Larsson S, Jonsson KB, Varghese OP. Bone reservoir: Injectable hyaluronic acid hydrogel for minimal invasive bone augmentation. J Control Release 2011; 152:232-40. [PMID: 21315118 DOI: 10.1016/j.jconrel.2011.02.003] [Citation(s) in RCA: 153] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2010] [Revised: 01/31/2011] [Accepted: 02/01/2011] [Indexed: 11/28/2022]
Abstract
A strategy has been designed to develop hyaluronic acid (HA) hydrogel for in vivo bone augmentation using minimal invasive technique. A mild synthetic procedure was developed to prepare aldehyde modified HA by incorporating an amino-glycerol side chain via amidation reaction and selective oxidation of the pendent group. This modification, upon mixing with hydrazide modified HA formed hydrazone-crosslinked hydrogel within 30s that was stable at physiological pH. In vitro experiments showed no cytotoxicity of hydrogel with the controlled release of active bone morphogenic protein-2 (BMP-2). In vivo evaluation of this gel as a BMP-2 carrier was performed by injecting gels over the rat calvarium and showed bone formation in 8 weeks in correlation with the amount of BMP-2 loaded (0, 1 and 30μg) within the gel. Furthermore, hydrogels with 30μg of BMP-2 induced less bone formation upon subcutaneous injection in comparison with subperiosteal implantation. Histological examination showed newly formed bone with a high expression of osteocalcin, osteopontin and with angiogenic bone marrow when higher BMP-2 concentration was employed. Our result suggests that novel HA hydrogels could be used as a BMP-2 carrier and can promote bone augmentation for potential orthopedic applications.
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Affiliation(s)
- Elena Martínez-Sanz
- Departamento de Anatomía y Embriología Humana I, Facultad de Medicina, Universidad Complutense de Madrid, 28040 Madrid, Spain
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92
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Rizzo A, Spedicato M, Mutinati M, Minoia G, Angioni S, Jirillo F, Pantaleo M, Sciorsci RL. Peritoneal adhesions in human and veterinary medicine: from pathogenesis to therapy. A review. Immunopharmacol Immunotoxicol 2010; 32:481-94. [PMID: 20128633 DOI: 10.3109/08923970903524367] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Any peritoneal inflammatory process consequent to infections or surgical injuries may induce abdominal adhesion formation. Peritoneal adhesions are connective laciniae that develop among abdomino-pelvic organs that limit physiologic visceral motion. Consequently, fertility may be impaired, and intestinal obstruction and pelvic pain may develop, mainly in subjects that had undergone gynaecological surgery. This review illustrates the pathogenic steps of adhesiogenesis and the therapeutic scenario that evolved over the years to tackle the threat of peritoneal adhesions, both in domestic animals and in women.
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Affiliation(s)
- Annalisa Rizzo
- Department of Animal Production, Faculty of Veterinary Medicine, University of Bari, Bari, Italy
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93
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Zheng Y, He C, Huynh CT, Lee DS. Biodegradable pH- and temperature-sensitive multiblock copolymer hydrogels based on poly(amino-ester urethane)s. Macromol Res 2010. [DOI: 10.1007/s13233-010-1002-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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94
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Weiniger CF, Golovanevski M, Sokolsky-Papkov M, Domb AJ. Review of prolonged local anesthetic action. Expert Opin Drug Deliv 2010; 7:737-52. [PMID: 20408748 DOI: 10.1517/17425241003767383] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
IMPORTANCE OF THE FIELD Pain following surgery is often treated by local anesthetic agents. Duration of the analgesia can be extended safely following administration of encapsulated large doses of local anesthetic agents. AREAS COVERED IN THIS REVIEW This review considers formulations used for encapsulation of local anesthetic agents for prolonged anesthesia effect. All studies describing encapsulation of a commercial local anesthetic agent for providing prolonged analgesia were considered using the NCBI Medline site. of local anesthetic, prolonged anesthesia, polymers and liposomes were entered in order to retrieve appropriate articles and reviews from 1966 to 2010, with emphasis on the last 10 years. Reference pages were searched manually for other relevant articles. The topics covered include an overview of local anesthetic agents and a review of local anesthetic carrier agents, with emphasis on liposomes and polymer carriers. Articles were limited to the English language. WHAT THE READER WILL GAIN The current research areas for prolongation of local anesthetic effect are evaluated, along with their limitations. Each topic has been summarized, and the review has attempted to cover all current laboratory and clinical studies in a simple manner that should also be useful for readers without a pharmacology background. The direction of research is promising and exciting, and this review should be a useful up-to-date reference. TAKE HOME MESSAGE Many formulations including polymer and liposome carriers have facilitated prolonged local anesthetic action for several days, although few clinical studies have been performed. This field promises a safe way to deliver local anesthetics for effect far beyond that of commercially available agents, with potential cost and health benefits for patients suffering chronic or postoperative pain.
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Affiliation(s)
- Carolyn F Weiniger
- Hadassah Hebrew University Medical Center, Department of Anesthesiology and Critical Care Medicine, Jerusalem, POB 12000, Israel.
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95
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Farran AJE, Teller SS, Jha AK, Jiao T, Hule RA, Clifton RJ, Pochan DP, Duncan RL, Jia X. Effects of matrix composition, microstructure, and viscoelasticity on the behaviors of vocal fold fibroblasts cultured in three-dimensional hydrogel networks. Tissue Eng Part A 2010; 16:1247-61. [PMID: 20064012 DOI: 10.1089/ten.tea.2009.0344] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Vocal fold diseases and disorders are difficult to treat surgically or therapeutically. Tissue engineering offers an alternative strategy for the restoration of functional vocal folds. As a first step toward vocal fold tissue engineering, we investigated the responses of primary vocal fold fibroblasts (PVFFs) to two types of collagen and hyaluronic acid (HA)-based hydrogels that are compositionally similar, but structurally variable and mechanically different. Type A hydrogels were composed of mature collagen fibers reinforced by oxidized HA, whereas type B hydrogels contained immature collagen fibrils interpenetrated in an amorphous, covalently cross-linked HA matrix. PVFFs encapsulated in either matrix adopted a fibroblastic morphology and expressed genes related to important extracellular matrix proteins. DNA analysis indicated a linear growth profile for cells encapsulated in type B gels from day 0 to 21, in contrast to an initial dormant, nonproliferative period from day 0 to 3 experienced by cells in type A gels. At the end of the culture, similar DNA content was detected in both types of constructs. A reduction in collagen content was observed for both types of constructs after 28 days of culture, with type A constructs generally retaining higher amounts of collagen than type B constructs. The HA content in the constructs decreased steadily throughout the culture, with type A constructs consistently exhibiting less HA than type B constructs. Using the torsional wave analysis, we found that the elastic moduli for type A constructs decreased sharply during the first week of culture, followed by 2 weeks of matrix stabilization without significant changes in matrix stiffness. Conversely, the elastic modulus for type B constructs increased moderately over time. It is postulated that PVFFs residing in gels alter the matrix organization, chemical compositions, and viscoelasticity through cell-mediated remodeling processes.
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Affiliation(s)
- Alexandra J E Farran
- Department of Materials Science and Engineering, University of Delaware , Newark, Delaware, USA
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96
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Luo Y, Kobler JB, Heaton JT, Jia X, Zeitels SM, Langer R. Injectable hyaluronic acid-dextran hydrogels and effects of implantation in ferret vocal fold. J Biomed Mater Res B Appl Biomater 2010; 93:386-93. [PMID: 20151459 DOI: 10.1002/jbm.b.31593] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Injectable hydrogels may potentially be used for augmentation/regeneration of the lamina propria of vocal fold tissue. In this study, hyaluronic acid (HA) and dextran were chemically modified and subsequently crosslinked via formation of hydrazone bonds in phosphate buffer. Swelling ratios, degradation, and compressive moduli of the resulting hydrogels were investigated. It was found that the properties of HA-dextran hydrogels were variable and the trend of variation could be correlated with the hydrogel composition. The biocompatibility of three injectable HA-dextran hydrogels with different crosslinking density was assessed in the vocal fold region using a ferret model. It was found that HA-dextran hydrogels implanted for three weeks stimulated mild foreign-body reactions. Distinct tissue-material interactions were also observed for hydrogels made from different formulations: the hydrogel with the lowest crosslinking density was completely degraded in vivo; while material residues were visible for other types of hydrogel injections, with or without cell penetration into the implantation depending on the hydrogel composition. The in vivo results suggest that the HA-dextran hydrogel matrices can be further developed for applications of vocal fold tissue restoration.
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Affiliation(s)
- Ying Luo
- Department of Biomedical Engineering, College of Engineering, Peking University, Haidian District, Beijing, China.
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97
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Wang ZC, Xu XD, Chen CS, Yun L, Song JC, Zhang XZ, Zhuo RX. In situ formation of thermosensitive PNIPAAm-based hydrogels by Michael-type addition reaction. ACS APPLIED MATERIALS & INTERFACES 2010; 2:1009-1018. [PMID: 20423120 DOI: 10.1021/am900712e] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
To investigate the possibility of in situ thermosensitive hydrogel formation via Michael-type addition reaction, we designed and prepared thiol- and vinyl-modified poly(N-isopropylacrylamide) (PNIPAAm)-based copolymers. When the solutions of these two kinds of PNIPAAm-based copolymers were mixed at physiological temperature (37 degrees C), a physical gelation resulting from the hydrophobic aggregation of PNIPAAm based copolymers and chemical cross-linking between thiol and vinyl functional groups or so-called chemical gelation occurred, resulting in the formation of a three-dimensional hydrogel. Because all the gelations were performed at a high temperature (above LCSTs of the PNIPAAm based copolymers), these in situ formed hydrogels presented heterogeneous network structures, resulting in an improved thermosensitivity in comparison with the conventional one.
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Affiliation(s)
- Zong-Chun Wang
- Department of Chemistry, Wuhan University, Wuhan 430072, People's Republic of China
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98
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Epstein-Barash H, Orbey G, Polat BE, Ewoldt RH, Feshitan J, Langer R, Borden MA, Kohane DS. A microcomposite hydrogel for repeated on-demand ultrasound-triggered drug delivery. Biomaterials 2010; 31:5208-17. [PMID: 20347484 DOI: 10.1016/j.biomaterials.2010.03.008] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2010] [Accepted: 03/03/2010] [Indexed: 10/19/2022]
Abstract
Here we develop an injectable composite system based for repeated ultrasound-triggered on-demand drug delivery. An in situ-cross-linking hydrogel maintains model drug (dye)-containing liposomes in close proximity to gas-filled microbubbles that serve to enhance release events induced by ultrasound application. Dye release is tunable by varying the proportions of the liposomal and microbubble components, as well as the duration and intensity of the ultrasound pulses in vitro. Dye is minimal at baseline. The composite shows minimal cytotoxicity in vitro, and benign tissue reaction after subcutaneous injection in rats. Ultrasound application also triggers drug release for two weeks after injection in vivo.
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Affiliation(s)
- Hila Epstein-Barash
- Laboratory for Biomaterials and Drug Delivery, Department of Anesthesiology, Division of Critical Care Medicine, Children's Hospital, Harvard Medical School, 300 Longwood Ave., Boston, MA 02115, USA
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99
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Hoare T, Bellas E, Zurakowski D, Kohane DS. Rheological blends for drug delivery. II. Prolongation of nerve blockade, biocompatibility, and in vitro-in vivo correlations. J Biomed Mater Res A 2010; 92:586-95. [PMID: 19280629 DOI: 10.1002/jbm.a.32420] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Rheological polymer blends of hyaluronic acid (HA) and hydroxypropylmethyl cellulose (HPMC) were evaluated as prolonged duration delivery vehicles for local anesthetics using a rat sciatic nerve blockade model. HA-HPMC blends extended the duration of sensory block approximately threefold compared to that achieved using a bupivacaine solution. Blending HA and HPMC facilitated the injection of higher polymer concentration delivery vehicles and reduced the rate of polymer hydration compared to HA solutions, enabling prolonged drug release. The duration of effective nerve block was correlated with each of the zero shear viscosity, polymer concentration, yield stress, and gel point frequency of the blends, while a two-parameter model correlating duration of nerve block with zero shear viscosity and humectancy provided improved fits to the in vivo data compared to any single variable alone. The blends exhibited no cytotoxicity and induced only a mild short-term inflammatory reaction in vivo at the site of injection, with all blends largely resorbed 4 days postinjection.
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Affiliation(s)
- Todd Hoare
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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100
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Liu P, Sun J, Huang J, Peng R, Tang J, Ding J. Fabrication of micropatterns of nanoarrays on a polymeric gel surface. NANOSCALE 2010; 2:122-7. [PMID: 20648373 DOI: 10.1039/b9nr00124g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Micro-nano patterns of gold on the surface of poly(ethylene glycol) (PEG) hydrogels were prepared. The approach combines the technique of conventional photolithography (a top-down method for micropatterns), block copolymer micelle nanolithography (a bottom-up method for gold nanopatterns), and a linker-assistant technique to transfer a pattern on a hard surface to a polymeric surface. Hybrid micro-nano patterns on hydrogels were characterized using scanning electron microscopy, atomic force microscopy and X-ray photoelectron spectroscopy. The patterned Au nanoparticles were further modified by a peptide containing arginine-glycine-aspatate (RGD). The cell-adhesion contrast of the patterned hydrogel surface was confirmed by preliminary cell experiments.
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Affiliation(s)
- Peng Liu
- Key Laboratory of Molecular Engineering of Polymers of Ministry of Education, Department of Macromolecular Science, Laboratory of Advanced Materials, Fudan University, Shanghai, China
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