1
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Zhao Y, Lin Z, Liu W, Piao M, Li J, Zhang H. Controlled Release of Growth Factor from Heparin Embedded Poly(aldehyde guluronate) Hydrogels and Its Effect on Vascularization. Gels 2023; 9:589. [PMID: 37504468 PMCID: PMC10379275 DOI: 10.3390/gels9070589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 07/04/2023] [Accepted: 07/18/2023] [Indexed: 07/29/2023] Open
Abstract
To deliver growth factors controllably for tissue regeneration, poly(aldehyde guluronate) (PAG) was obtained from alginate and covalently cross-linked with aminated gelatin (AG) to form PAG/AG hydrogel as a growth factors carrier. The prepared hydrogel exhibits a slow degradation rate and excellent cytocompatibility. Heparin was conjugated with gelatin and embedded into the hydrogel to reserve and stabilize growth factors. Basic fibroblast growth factor (bFGF) was immobilized into the hydrogel and performed sustained release as the hydrogel degraded. The bFGF loaded hydrogel can improve vascularization effectively in a rat dorsal sac model. To summarize, heparin embedded PAG/AG hydrogels would serve as a promising biodegradable vehicle for the controlled delivery of growth factors and promoting vascularization in regenerative medicine.
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Affiliation(s)
- Yilan Zhao
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Zezhong Lin
- School of Science, Tianjin University, Tianjin 300072, China
- Key Laboratory of Resource Chemistry and Eco-Environmental Protection in Tibetan Plateau of State Ethnic Affairs Commission, School of Chemistry and Chemical Engineering, Qinghai Minzu University, Xining 810007, China
| | - Wenqu Liu
- School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Mingwei Piao
- School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Junjie Li
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Key Laboratory of Resource Chemistry and Eco-Environmental Protection in Tibetan Plateau of State Ethnic Affairs Commission, School of Chemistry and Chemical Engineering, Qinghai Minzu University, Xining 810007, China
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin 300350, China
| | - Hong Zhang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin 300350, China
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2
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Li Y, Xu Z, Wang J, Pei X, Chen J, Wan Q. Alginate-based biomaterial-mediated regulation of macrophages in bone tissue engineering. Int J Biol Macromol 2023; 230:123246. [PMID: 36649862 DOI: 10.1016/j.ijbiomac.2023.123246] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 12/06/2022] [Accepted: 01/09/2023] [Indexed: 01/15/2023]
Abstract
Many studies in the bone tissue engineering field have focused on the interactions between materials and bone marrow stem cells. With the development of osteoimmunology, the immune cells' essential role in biomaterial-mediated osteogenesis has increasingly been recognized. As a promising therapeutic candidate for bone defects due to their prominent biocompatibility, tuneability, and versatility, it is necessary to develop alginate-based biomaterials that can regulate immune cells, especially macrophages. Moreover, modified alginate-based biomaterials may facilitate better regulation of macrophage phenotypes by the newly endowed physicochemical properties, including stiffness, porosity, hydrophilicity, and electrical properties. This review summarizes the role of macrophages in bone regeneration and the recent research progress related to the effects of alginate-based biomaterials on macrophages applied in bone tissue engineering. This review also emphasizes the strategies adopted by material design to regulate macrophage phenotypes, the corresponding macrophage responses, and their contribution to osteogenesis.
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Affiliation(s)
- Yuanyuan Li
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China; West China School of Stomatology, Sichuan University, Chengdu 610041, China
| | - Zhengyi Xu
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China; West China School of Stomatology, Sichuan University, Chengdu 610041, China
| | - Jian Wang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China; West China School of Stomatology, Sichuan University, Chengdu 610041, China
| | - Xibo Pei
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China; West China School of Stomatology, Sichuan University, Chengdu 610041, China
| | - Junyu Chen
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China; West China School of Stomatology, Sichuan University, Chengdu 610041, China.
| | - Qianbing Wan
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China; West China School of Stomatology, Sichuan University, Chengdu 610041, China.
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3
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Ardiles CS, Rodríguez CC. Theoretical study for determining the type of interactions between a GG block of an alginate chain with metals Cu2+, Mn2+, Ca2+ and Mg2+. ARAB J CHEM 2021. [DOI: 10.1016/j.arabjc.2021.103325] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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4
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Alginate hydrogels for bone tissue engineering, from injectables to bioprinting: A review. Carbohydr Polym 2020; 229:115514. [DOI: 10.1016/j.carbpol.2019.115514] [Citation(s) in RCA: 199] [Impact Index Per Article: 49.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 10/08/2019] [Accepted: 10/20/2019] [Indexed: 12/16/2022]
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5
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Pandit AH, Mazumdar N, Ahmad S. Periodate oxidized hyaluronic acid-based hydrogel scaffolds for tissue engineering applications. Int J Biol Macromol 2019; 137:853-869. [DOI: 10.1016/j.ijbiomac.2019.07.014] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 06/24/2019] [Accepted: 07/02/2019] [Indexed: 02/06/2023]
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6
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de Silva UK, Brown J, Lapitsky Y. Poly(allylamine)/tripolyphosphate coacervates enable high loading and multiple-month release of weakly amphiphilic anionic drugs: an in vitro study with ibuprofen. RSC Adv 2018; 8:19409-19419. [PMID: 35540986 PMCID: PMC9080659 DOI: 10.1039/c8ra02588f] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2018] [Accepted: 05/14/2018] [Indexed: 01/06/2023] Open
Abstract
When synthetic polyamines, such poly(allylamine hydrochloride) (PAH), are mixed with crosslink-forming multivalent anions, they can undergo complex coacervation. This phenomenon has recently been exploited in various applications, ranging from inorganic material synthesis, to underwater adhesion, to multiple-month release of small, water-soluble molecules. Here, using ibuprofen as a model drug molecule, we show that these coacervates may be especially effective in the long-term release of weakly amphiphilic anionic drugs. Colloidal amphiphile/polyelectrolyte complex dispersions are first prepared by mixing the amphiphilic drug (ibuprofen) with PAH. Pentavalent tripolyphosphate (TPP) ions are then added to these dispersions to form ibuprofen-loaded PAH/TPP coacervates (where the strongly-binding TPP displaces the weaker-bound ibuprofen from the PAH amine groups). The initial ibuprofen/PAH binding leads to extremely high drug loading capacities (LC-values), where the ibuprofen comprises up to roughly 30% of the coacervate mass. Conversely, the dense ionic crosslinking of PAH by TPP results in very slow release rates, where the release of ibuprofen (a small, water-soluble drug) is extended over timescales that exceed 6 months. When ibuprofen is replaced with strong anionic amphiphiles, however (i.e., sodium dodecyl sulfate and sodium dodecylbenzenesulfonate), the stronger amphiphile/polyelectrolyte binding disrupts PAH/TPP association and sharply increases the coacervate solute permeability. These findings suggest that: (1) as sustained release vehicles, PAH/TPP coacervates might be very attractive for the encapsulation and multiple-month release of weakly amphiphilic anionic payloads; and (2) strong amphiphile incorporation could be useful for tailoring PAH/TPP coacervate properties. Gel-like coacervates prepared through ionotropic gelation enable very high loading and multiple-month release of weakly amphiphilic small molecules. Conversely, strong amphiphile incorporation disrupts ionic crosslinking and strikingly alters the coacervate properties.![]()
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Affiliation(s)
| | | | - Yakov Lapitsky
- Department of Chemical Engineering
- University of Toledo
- Toledo
- USA
- School of Green Chemistry and Engineering
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7
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Synthesis of hybrid compounds composed of daunorubicin covalently linked with Cp 2 Fe and CpMn(CO) 3. MENDELEEV COMMUNICATIONS 2017. [DOI: 10.1016/j.mencom.2017.11.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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8
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Artyushin OI, Sharova EV, Vinogradova NM, Genkina GK, Moiseeva AA, Khodak AA, Brel VK. Synthesis of new daunorubicin N-derivatives by one-step reductive amination. RUSS J GEN CHEM+ 2017. [DOI: 10.1134/s1070363217060330] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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9
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Benner SW, Hall CK. Effect of Monomer Sequence and Degree of Acetylation on the Self-Assembly and Porosity of Chitosan Networks in Solution. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01063] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Steven W. Benner
- Department
of Chemical and
Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, United States
| | - Carol K. Hall
- Department
of Chemical and
Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, United States
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10
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Fawzy A. Oxidation of alginate and pectate biopolymers by cerium(IV) in perchloric and sulfuric acid solutions: A comparative kinetic and mechanistic study. Carbohydr Polym 2016; 138:356-64. [DOI: 10.1016/j.carbpol.2015.10.076] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2015] [Revised: 10/09/2015] [Accepted: 10/22/2015] [Indexed: 11/16/2022]
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11
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Lawrence PG, Patil PS, Leipzig ND, Lapitsky Y. Ionically Cross-Linked Polymer Networks for the Multiple-Month Release of Small Molecules. ACS APPLIED MATERIALS & INTERFACES 2016; 8:4323-4335. [PMID: 26811936 PMCID: PMC4768684 DOI: 10.1021/acsami.5b10070] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Accepted: 01/26/2016] [Indexed: 06/05/2023]
Abstract
Long-term (multiple-week or -month) release of small, water-soluble molecules from hydrogels remains a significant pharmaceutical challenge, which is typically overcome at the expense of more-complicated drug carrier designs. Such approaches are payload-specific and include covalent conjugation of drugs to base materials or incorporation of micro- and nanoparticles. As a simpler alternative, here we report a mild and simple method for achieving multiple-month release of small molecules from gel-like polymer networks. Densely cross-linked matrices were prepared through ionotropic gelation of poly(allylamine hydrochloride) (PAH) with either pyrophosphate (PPi) or tripolyphosphate (TPP), all of which are commonly available commercial molecules. The loading of model small molecules (Fast Green FCF and Rhodamine B dyes) within these polymer networks increases with the payload/network binding strength and with the PAH and payload concentrations used during encapsulation. Once loaded into the PAH/PPi and PAH/TPP ionic networks, only a few percent of the payload is released over multiple months. This extended release is achieved regardless of the payload/network binding strength and likely reflects the small hydrodynamic mesh size within the gel-like matrices. Furthermore, the PAH/TPP networks show promising in vitro cytocompatibility with model cells (human dermal fibroblasts), though slight cytotoxic effects were exhibited by the PAH/PPi networks. Taken together, the above findings suggest that PAH/PPi and (especially) PAH/TPP networks might be attractive materials for the multiple-month delivery of drugs and other active molecules (e.g., fragrances or disinfectants).
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Affiliation(s)
- Patrick G. Lawrence
- Department of Chemical
and Environmental Engineering, University
of Toledo, Toledo, Ohio 43606, United
States
| | - Pritam S. Patil
- Department of Chemical and Biomolecular Engineering, University of Akron, Akron, Ohio 44325, United States
| | - Nic D. Leipzig
- Department of Chemical and Biomolecular Engineering, University of Akron, Akron, Ohio 44325, United States
| | - Yakov Lapitsky
- Department of Chemical
and Environmental Engineering, University
of Toledo, Toledo, Ohio 43606, United
States
- School of Green Chemistry and Engineering, University of Toledo, Toledo, Ohio 43606, United States
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12
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Fawzy A, Altass HM. Ruthenium(III)-catalyzed oxidation of alginate and pectate biopolymers by chromic acid in aqueous perchlorate solutions: a comparative kinetic study. TRANSIT METAL CHEM 2015. [DOI: 10.1007/s11243-015-0004-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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13
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Fu C, Li H, Li N, Miao X, Xie M, Du W, Zhang LM. Conjugating an anticancer drug onto thiolated hyaluronic acid by acid liable hydrazone linkage for its gelation and dual stimuli-response release. Carbohydr Polym 2015; 128:163-70. [DOI: 10.1016/j.carbpol.2015.04.024] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Revised: 04/02/2015] [Accepted: 04/04/2015] [Indexed: 01/17/2023]
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14
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Duffy CV, David L, Crouzier T. Covalently-crosslinked mucin biopolymer hydrogels for sustained drug delivery. Acta Biomater 2015; 20:51-59. [PMID: 25818947 DOI: 10.1016/j.actbio.2015.03.024] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Revised: 02/24/2015] [Accepted: 03/21/2015] [Indexed: 12/11/2022]
Abstract
The sustained delivery of both hydrophobic and hydrophilic drugs from hydrogels has remained a challenge requiring the design and scalable production of complex multifunctional synthetic polymers. Here, we demonstrate that mucin glycoproteins, the gel-forming constituents of native mucus, are suitable for assembly into robust hydrogels capable of facilitating the sustained release of hydrophobic and hydrophilic drugs. Covalently-crosslinked mucin hydrogels were generated via exposure of methacrylated mucin to ultraviolet light in the presence of a free radical photoinitiator. The hydrogels exhibited an elastic modulus similar to that of soft mammalian tissue and were sensitive to proteolytic degradation by pronase. Paclitaxel, a hydrophobic anti-cancer drug, and polymyxin B, a positively-charged hydrophilic antibacterial drug, were retained in the hydrogels and released linearly with time over seven days. After four weeks of drug release, the hydrogels continued to release sufficient amounts of active paclitaxel to reduce HeLa cell viability and sufficient amounts of active polymyxin B to prevent bacterial proliferation. Along with previously-established anti-inflammatory, anti-viral, and hydrocarbon-solubilizing properties of mucin, the results of this study establish mucin as a readily-available, chemically-versatile, naturally-biocompatible alternative to complex multifunctional synthetic polymers as building blocks in the design of biomaterials for sustained drug delivery.
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Affiliation(s)
- Connor V Duffy
- Department of Biological Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Building 56-341C, Cambridge, MA 02139, USA
| | - Laurent David
- Ingénierie des Matériaux Polymères, Université de Lyon, Université Claude Bernard Lyon 1, UMR CNRS 5223, 15 Boulevard Latarjet, 69622 Villeurbanne Cedex, France
| | - Thomas Crouzier
- Department of Biological Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Building 56-341C, Cambridge, MA 02139, USA; Ingénierie des Matériaux Polymères, Université de Lyon, Université Claude Bernard Lyon 1, UMR CNRS 5223, 15 Boulevard Latarjet, 69622 Villeurbanne Cedex, France.
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15
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Das D, Pal S. Modified biopolymer-dextrin based crosslinked hydrogels: application in controlled drug delivery. RSC Adv 2015. [DOI: 10.1039/c4ra16103c] [Citation(s) in RCA: 98] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This review describes hydrogels and their classifications along with the synthesis and properties of biopolymer-dextrin based crosslinked hydrogels towards potential application in controlled drug delivery.
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Affiliation(s)
- Dipankar Das
- Polymer Chemistry Laboratory
- Department of Applied Chemistry
- Indian School of Mines
- Dhanbad-826004
- India
| | - Sagar Pal
- Polymer Chemistry Laboratory
- Department of Applied Chemistry
- Indian School of Mines
- Dhanbad-826004
- India
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16
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Cleavable carbamate linkers for controlled protein delivery from hydrogels. J Control Release 2014; 183:67-76. [PMID: 24680687 DOI: 10.1016/j.jconrel.2014.03.031] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 03/17/2014] [Accepted: 03/18/2014] [Indexed: 11/21/2022]
Abstract
The reversible attachment of proteins to polymers is one potential strategy to control protein release from hydrogels. In this study, we report the reversible attachment of lysozyme to poly(ethylene glycol) (PEG) by degradable carbamate linkers. Phenyl groups with different substituents were used to control the rate of carbamate hydrolysis and the resulting protein release. Sodium dodecyl sulfate polyacrylamide gel electrophoresis showed modification with 1-3 PEG chains per lysozyme molecule. Protein PEGylation and PEG chain elimination occurred without changes in secondary protein structure, as demonstrated by circular dichroism spectroscopy. The lytic activity of lysozyme was restored to 73.4±1.7%-92.5±1.2% during PEG chain elimination. Attached PEG chains were eliminated within 24h to 28days, depending on the used linker molecule. When formulated into hydrogels, a maximum of about 60% of the initial dose was released within 7days to 21days. Linker elimination occurs 'traceless', so that the protein is released in its native, unmodified form. Altogether, we believe that tethering proteins by degradable carbamate linkers is a promising strategy to control their release from hydrogels.
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17
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Using casein and oxidized hyaluronic acid to form biocompatible composite hydrogels for controlled drug release. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 36:287-93. [DOI: 10.1016/j.msec.2013.12.025] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Revised: 12/10/2013] [Accepted: 12/17/2013] [Indexed: 01/16/2023]
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18
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19
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Wang Y, Tu S, Pinchuk AN, Xiong MP. Active drug encapsulation and release kinetics from hydrogel-in-liposome nanoparticles. J Colloid Interface Sci 2013; 406:247-55. [PMID: 23809875 PMCID: PMC3717358 DOI: 10.1016/j.jcis.2013.05.081] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Revised: 05/26/2013] [Accepted: 05/30/2013] [Indexed: 10/26/2022]
Abstract
Herein, we demonstrate for the first time the use of hydrogel-in-liposome nanoparticles (lipogels) as a promising drug delivery vehicle for the active encapsulation of the anticancer drug 17-DMAPG, a geldanamycin (GA) derivative. This model drug was chosen due to its improved aqueous solubility (4.6 mg/ml) compared to the parent GA (<0.01 mg/ml), and presence of a tertiary amine which readily protonates at low pH. For the design of lipogels, a PAA hydrogel core was formed inside liposomes through UV-initiated DEAP activation and polymerization of AA and BA. We have demonstrated here that electrostatic interactions between drug and gel are critical for active encapsulation and sustained release of 17-DMAPG. We found that optimal loading conditions could be obtained (88% loading efficiency) through control of pH, temperature and incubation time. Dramatic sustained drug release from lipogels was achieved independent of the external solution pH (ca. 54 h to 50% drug release) and confirmed that the lipid bilayer was intact in the presence of the gel core. In vitro cell culture studies revealed that at the highest concentration tested, which corresponded to approximately 0.4 mg/ml of material, lipogels did not exert cytotoxicity to cells.
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Affiliation(s)
- Yan Wang
- Pharmaceutical Sciences Division, School of Pharmacy, University of Wisconsin-Madison, 777 Highland Avenue, Madison, WI 53705-2222 (U.S.A.)
| | - Sheng Tu
- Pharmaceutical Sciences Division, School of Pharmacy, University of Wisconsin-Madison, 777 Highland Avenue, Madison, WI 53705-2222 (U.S.A.)
| | - Anatoly N. Pinchuk
- Pharmaceutical Sciences Division, School of Pharmacy, University of Wisconsin-Madison, 777 Highland Avenue, Madison, WI 53705-2222 (U.S.A.)
| | - May P. Xiong
- Pharmaceutical Sciences Division, School of Pharmacy, University of Wisconsin-Madison, 777 Highland Avenue, Madison, WI 53705-2222 (U.S.A.)
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20
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Guan Y, Bian J, Peng F, Zhang XM, Sun RC. High strength of hemicelluloses based hydrogels by freeze/thaw technique. Carbohydr Polym 2013; 101:272-80. [PMID: 24299774 DOI: 10.1016/j.carbpol.2013.08.085] [Citation(s) in RCA: 100] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 08/23/2013] [Accepted: 08/25/2013] [Indexed: 11/26/2022]
Abstract
Novel hydrogels were prepared from hemicelluloses, polyvinyl alcohol (PVA), and chitin nanowhiskers through 0, 1, 3, 5, 7, and 9 times of freeze/thaw cycle. These hydrogels were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray diffraction (XRD), thermo-gravimetric analysis (TGA), swelling property, and compressive strength. The repeated freeze/thaw cycles induced physically crosslinked chains packing among these polymers, and a phase separation caused by the hydrogen bonds. Larger pores led to a high swelling degree, whereas the formation of compact structure after multiple freeze/thaw cycles resulted in high mechanical strength and thermal stability. The highest compressive strength of these hydrogels was achieved by the 9 times of freeze/thaw cycles with compressive stress of 10.5 MPa. This work provides a remarkable way for the preparation of hydrogels with good mechanical properties by physical method.
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Affiliation(s)
- Ying Guan
- Beijing Key Laboratory of Lignocellulosic Chemistry, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China
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21
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Bai X, Fang R, Zhang S, Shi X, Wang Z, Chen X, Yang J, Hou X, Nie Y, Li Y, Tian W. Self-cross-linkable hydrogels composed of partially oxidized alginate and gelatin for myocardial infarction repair. J BIOACT COMPAT POL 2013. [DOI: 10.1177/0883911512473230] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Calcium cross-linked alginate hydrogel has shown positive results for the treatment of myocardial infarction in both acute and chronic rat models. However, cross-linked alginate hydrogels possess poor mechanical properties, uncontrollable degradation, and poor cell adhesion and infiltration. In this study, covalent cross-linking of partially oxidized alginate and gelatin hydrogel was developed for myocardial infarction treatment, as compared to cross-linked alginate hydrogel and saline. Specifically, the gelation process, mechanical properties, and biodegradation of both cross-linked alginate hydrogel and oxidized alginate and gelatin hydrogel were examined in vitro and in vivo; and a rat myocardial infarction model was developed by injecting hydrogel into hearts, and postinjection, echocardiography was performed at 2, 4, and 6 weeks, respectively. Matrix metalloprotease-2/9 activity was also examined by in situ zymography on frozen slices of the treated hearts. Based on the results, that both hydrogels enhanced scar thickness and attenuated heart remodeling compared with the saline control group and that, compared to cross-linked alginate hydrogel, oxidized alginate and gelatin hydrogel exhibited the increased mechanical strength, enhanced angiogenesis, and stronger cell-recruiting capacity. It has also been illustrated that oxidized alginate and gelatin hydrogel–treated hearts have much weaker cardiac remodeling, enhanced extracellular matrix accumulation, and reduced matrix metalloprotease activity than cross-linked alginate hydrogel–treated ones. All results suggest oxidized alginate and gelatin hydrogel may be more suitable for the myocardial infarction treatment.
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Affiliation(s)
- Xiuping Bai
- Bio-X Center, School of Life Science and Technology, Harbin Institute of Technology, Harbin, P. R. China
| | - Rui Fang
- Bio-X Center, School of Life Science and Technology, Harbin Institute of Technology, Harbin, P. R. China
| | - Song Zhang
- State Key Laboratory of Cancer Biology and Xijing Hospital of Digestive Diseases, The Fourth Military Medical University, P. R. China
| | - Xinli Shi
- Center for Medical Device Evaluation, State Food and Drug Administration, Beijing, P. R. China
| | - Zeli Wang
- Bio-X Center, School of Life Science and Technology, Harbin Institute of Technology, Harbin, P. R. China
| | - Xiongbiao Chen
- Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, SK, Canada
| | - Jing Yang
- Department of Tourism Culinary, Harbin University of Commerce, Harbin, P. R. China
| | - Xiaolu Hou
- Department of cardiology, The Fourth Affiliated Hospital of Harbin Medical University, Harbin, P. R. China
| | - Yongzhan Nie
- State Key Laboratory of Cancer Biology and Xijing Hospital of Digestive Diseases, The Fourth Military Medical University, P. R. China
| | - Yu Li
- Bio-X Center, School of Life Science and Technology, Harbin Institute of Technology, Harbin, P. R. China
| | - Weiming Tian
- Bio-X Center, School of Life Science and Technology, Harbin Institute of Technology, Harbin, P. R. China
- State Key Laboratory of Cancer Biology and Xijing Hospital of Digestive Diseases, The Fourth Military Medical University, P. R. China
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22
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Fejerskov B, Smith AAA, Jensen BEB, Hussmann T, Zelikin AN. Bioresorbable surface-adhered enzymatic microreactors based on physical hydrogels of poly(vinyl alcohol). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:344-354. [PMID: 23210621 DOI: 10.1021/la3040903] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Hydrogel biomaterials based on poly(vinyl alcohol), PVA, have an extensive history of biomedical applications, yet in their current form suffer from significant shortcomings, such as a lack of mechanism of biodegradation and poor opportunities in controlled drug release. We investigate physical hydrogels of PVA as surface-adhered materials and present biodegradable matrices equipped with innovative tools in substrate-mediated drug release. Toward the final goal, PVA chains with narrow polydispersities (1.1-1.2) and molecular weights of 5, 10, and 28 kDa are synthesized via controlled radical polymerization (RAFT). These molecular weights are shown to be suitably high to afford robust hydrogel matrices and at the same time suitably low to allow gradual erosion of the hydrogels with kinetics of degradation controlled via polymer macromolecular characteristics. For opportunities in controlled drug release, hydrogels are equipped with enzymatic cargo to achieve an in situ conversion of externally added prodrug into a final product, thus giving rise to surface-adhered enzymatic microreactors. Hydrogel-mediated enzymatic activity was investigated as a function of polymer molecular weight and concentration of solution taken for assembly of hydrogels. Taken together, we present, to the best of our knowledge, the first example of bioresorbable physical hydrogel based on PVA with engineered opportunities in substrate-mediated enzymatic activity and envisioned utility in surface-mediated drug delivery and tissue engineering.
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Sivakumaran D, Maitland D, Oszustowicz T, Hoare T. Tuning drug release from smart microgel-hydrogel composites via cross-linking. J Colloid Interface Sci 2012; 392:422-430. [PMID: 23137903 DOI: 10.1016/j.jcis.2012.07.096] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2012] [Revised: 07/12/2012] [Accepted: 07/24/2012] [Indexed: 10/27/2022]
Abstract
Soft nanocomposite hydrogels consisting of thermoresponsive microgels physically entrapped or covalently cross-linked to a non-thermoresponsive hydrogel are synthesized and tested for their capacity to facilitate long-term drug release of a small molecule drug. Copolymer microgels based on N-isopropylacrylamide and acrylic acid were synthesized that exhibited ionic affinity for binding to bupivacaine, a cationic local anesthetic. These microgels were subsequently physically entrapped within an in situ-gelling carbohydrate-based hydrogel network cross-linked via hydrazide-aldehyde chemistry; alternately, hydrazide-functionalized microgels were prepared that covalently cross-linked to the bulk hydrogel phase. Both the overall rate of drug release and the magnitude of the burst release were significantly decreased when microgels were restricted from undergoing a phase transition between the preparation temperature of the nanocomposite (25°C) and the test temperature (37°C), whether deswelling was inhibited by increasing the cross-link density within the microgel itself or by cross-linking the microgel to the bulk hydrogel network. This result facilitates facile tuning of soft nanocomposite drug delivery systems to achieve targeted drug release kinetics.
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Affiliation(s)
- Daryl Sivakumaran
- Department of Chemical Engineering, McMaster University, 1280 Main St. W, Hamilton, Ontario, Canada L8S 4L7
| | - Danielle Maitland
- Department of Chemical Engineering, McMaster University, 1280 Main St. W, Hamilton, Ontario, Canada L8S 4L7
| | - Thomas Oszustowicz
- Department of Chemical Engineering, McMaster University, 1280 Main St. W, Hamilton, Ontario, Canada L8S 4L7
| | - Todd Hoare
- Department of Chemical Engineering, McMaster University, 1280 Main St. W, Hamilton, Ontario, Canada L8S 4L7.
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Hydrogels as drug-delivery platforms: physicochemical barriers and solutions. Ther Deliv 2012; 3:775-86. [DOI: 10.4155/tde.12.48] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The properties of hydrogels, in particular their high biocompatibility and water sorption uptake, make hydrogels very attractive in drug delivery and biomedical devices. These favorable features of hydrogels are compromised by certain structural limitations such as those associated with their low mechanical strength in the swollen state. This review highlights the most important challenges that may seriously affect the practical implementation of hydrogels in clinical practice and the solutions that may be applied to overcome these limitations.
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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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Aptamer-incorporated hydrogels for visual detection, controlled drug release, and targeted cancer therapy. Anal Bioanal Chem 2011; 402:187-94. [PMID: 22052153 DOI: 10.1007/s00216-011-5414-4] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2011] [Revised: 09/09/2011] [Accepted: 09/11/2011] [Indexed: 12/22/2022]
Abstract
Hydrogels are water-retainable materials, made from cross-linked polymers, that can be tailored to applications in bioanalysis and biomedicine. As technology advances, an increasing number of molecules have been used as the components of hydrogel systems. However, the shortcomings of these systems have prompted researchers to find new materials that can be incorporated into them. Among all of these emerging materials, aptamers have recently attracted substantial attention because of their unique properties, for example biocompatibility, selective binding, and molecular recognition, all of which make them promising candidates for target-responsive hydrogel engineering. In this work, we will review how aptamers have been incorporated into hydrogel systems to enable colorimetric detection, controlled drug release, and targeted cancer therapy.
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Sivakumaran D, Maitland D, Hoare T. Injectable Microgel-Hydrogel Composites for Prolonged Small-Molecule Drug Delivery. Biomacromolecules 2011; 12:4112-20. [PMID: 22007750 DOI: 10.1021/bm201170h] [Citation(s) in RCA: 151] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daryl Sivakumaran
- Department of Chemical Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario,
Canada L8S 4L7
| | - Danielle Maitland
- Department of Chemical Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario,
Canada L8S 4L7
| | - Todd Hoare
- Department of Chemical Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario,
Canada L8S 4L7
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29
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Photosensitive controlled release with polyethylene glycol–anthracene modified alginate. Eur J Pharm Biopharm 2011; 79:304-13. [DOI: 10.1016/j.ejpb.2011.03.023] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2010] [Revised: 03/23/2011] [Accepted: 03/25/2011] [Indexed: 11/20/2022]
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Yan XM, Seo MS, Hwang EJ, Cho IH, Hahn SK, Sohn UD. Improved synthesis of hyaluronic acid hydrogel and its effect on tissue augmentation. J Biomater Appl 2011; 27:179-86. [PMID: 21527495 DOI: 10.1177/0885328211398508] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
HA-HMDA hydrogels were developed by direct amide bond formation between the carboxyl groups of hyaluronic acid (HA) and hexamethylenediamine (HMDA) with an optimized carboxyl group modification in the preliminary experiment. However, these HA-HMDA hydrogels transformed into an unstable liquid form after steam sterilization, and were problematic for application to actual dermal filler. A new method to overcome the problem of the previously developed HA-HMDA hydrogels is to prepare them by adjusting the pH in this study. Not only are these improved HA-HMDA hydrogels prepared with lower amounts of cross-linking and activation agents compared to the previously developed hydrogels, but they also maintain a stable form after steam sterilization. These improved HA-HMDA hydrogels showed higher viscoelasticity and longer lasting effects than the previous ones, despite the fact that the amount of the HMDA used as a cross-linking agent as well as 1-ethyl-3-[3-(dimethylamino)propyl]carbodiimide (EDC) and 1-hydroxybenzotriazole monohydrated (HOBt) used as activation agents were substantially reduced. According to an in vivo test using a wrinkled mouse model, the improved HA-HMDA hydrogels exhibited significantly improved tissue augmentation effects compared to a positive control of Restylane, which is widely used for the tissue augmentation throughout the world. Furthermore, histological analysis revealed excellent biocompatibility and safety of the improved synthesized HA-HMDA hydrogels.
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Affiliation(s)
- Xiang Mei Yan
- Department of Pharmacology, College of Pharmacy, Chung Ang University, Seoul 156-756, Republic of Korea
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Mehrotra S, Lynam D, Liu C, Shahriari D, Lee I, Tuszynski M, Sakamoto J, Chan C. Time controlled release of arabinofuranosylcytosine (Ara-C) from agarose hydrogels using layer-by-layer assembly: an in vitro study. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2011; 23:439-63. [PMID: 21294967 PMCID: PMC3873741 DOI: 10.1163/092050610x552221] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Experimentally induced axonal regeneration is compromised by glial scar formation arising from leptomeningeal fibroblasts cells in and around the hydrogel scaffold implanted for nerve repair. Strategies are needed to prevent such fibroblastic reactive cell layer formation for enhanced axonal regeneration. Here, we implement the technique of layer-by-layer assembled degradable, hydrogen bonded multilayers on agarose hydrogels to incorporate an anti-mitotic drug (1-β-D-arabinofuranosylcytosine (Ara-C)) within the agarose hydrogels. We show controlled release of Ara-C under physiological conditions over a period of days. The concentrations of Ara-C released from agarose at the different time points were sufficient to inhibit fibroblast growth in vitro, while not adversely affecting the viability of the neuronal cells.
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Affiliation(s)
- Sumit Mehrotra
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA
| | - Daniel Lynam
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA
| | - Chun Liu
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA
| | - Dena Shahriari
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA
| | - Ilsoon Lee
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA
| | - Mark Tuszynski
- Center for Neural Repair, Department of Neurosciences, University of California, San Diego, CA 92093, USA
| | - Jeffrey Sakamoto
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA
| | - Christina Chan
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824, USA
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Tan H, Li H, Rubin JP, Marra KG. Controlled gelation and degradation rates of injectable hyaluronic acid-based hydrogels through a double crosslinking strategy. J Tissue Eng Regen Med 2011; 5:790-7. [PMID: 22002922 DOI: 10.1002/term.378] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2010] [Accepted: 09/02/2010] [Indexed: 01/10/2023]
Abstract
Various biodegradable hydrogels have been employed as injectable scaffolds for tissue engineering and drug delivery. We report a double-crosslinking strategy of biocompatible and biodegradable hydrogels derived from aminated and oxidized hyaluronic acid (HA) with genipin (GP), a compound naturally derived from the gardenia fruit. Fast gelation is attributed to the Schiff-base reaction between amino and aldehyde groups of polysaccharide derivatives, and the subsequent crosslinking with GP results in ideal biodegradability and mechanical properties. The gelation time, morphology, equilibrium swelling, compressive modulus and degradation of double-crosslinked hydrogels were examined. The double crosslinked hydrogels were examined in vivo via subcutaneous injection into a mouse model. Histological results indicated favourable biocompatility, as revealed by an absence of neutrophils and macrophages. These studies demonstrate that double-crosslinked HA hydrogels are potentially useful as injectable, biodegradable hydrogels in tissue-engineering applications.
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Affiliation(s)
- Huaping Tan
- Division of Plastic Surgery, Department of Surgery, University of Pittsburgh, Pittsburgh, PA 15261, USA
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Takei T, Sato M, Ijima H, Kawakami K. In Situ Gellable Oxidized Citrus Pectin for Localized Delivery of Anticancer Drugs and Prevention of Homotypic Cancer Cell Aggregation. Biomacromolecules 2010; 11:3525-30. [DOI: 10.1021/bm1010068] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Takayuki Takei
- Department of Chemical Engineering, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0385, Japan
| | - Mitsunobu Sato
- Department of Chemical Engineering, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0385, Japan
| | - Hiroyuki Ijima
- Department of Chemical Engineering, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0385, Japan
| | - Koei Kawakami
- Department of Chemical Engineering, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0385, Japan
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Chang SCN, Chung HY, Tai CL, Chen PKT, Lin TM, Jeng LB. Repair of large cranial defects by hBMP-2 expressing bone marrow stromal cells: comparison between alginate and collagen type I systems. J Biomed Mater Res A 2010; 94:433-41. [PMID: 20186742 DOI: 10.1002/jbm.a.32685] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Despite a wide range of available sources for bone repair, significant limitations persist. To bioengineer bone, we have previously transferred adenovirus-mediated human BMP-2 gene into autologous bone marrow stromal cells (MSC). We have successfully repaired large, full thickness, cranial defects using this approach. We report now the effectiveness of various hydrogels as the scaffold for this type of bone regeneration, comparing specifically alginate with Type I collagen. Cultured MSC of miniature swine were infected with BMP-2 or beta-gal adenovirus 7 days before implantation. These cells were mixed with alginate, ultrapure alginate, alginate-RGD, or type I collagen to fabricate the MSC/biomaterial constructs. The results of cranial bone regeneration were assessed by gross examination, histology, 3D CT, and biomechanical tests at 6 weeks and 3 months after implantation. We found that the BMP-2 MSC/collagen type I construct, but not the beta-gal control, effectively achieved nearly complete repair of the cranial defects. No bone regeneration was observed with the other hydrogels. Biomechanical testing showed that the new bone strength was very close and only slightly inferior to that of normal cranial bone. Controlling for the integration of stem cells and ex vivo gene transfer, the alginate scaffolds has a significant negative impact on the success of the construct. Our study demonstrates better bone regeneration by collagen type I over alginate. This may have therapeutic implications for tissue engineered bone repair.
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Mehrotra S, Lynam D, Maloney R, Pawelec KM, Tuszynski MH, Lee I, Chan C, Sakamoto J. Time Controlled Protein Release from Layer-by-Layer Assembled Multilayer Functionalized Agarose Hydrogels. ADVANCED FUNCTIONAL MATERIALS 2010; 20:247-258. [PMID: 20200599 PMCID: PMC2830720 DOI: 10.1002/adfm.200901172] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Axons of the adult central nervous system exhibit an extremely limited ability to regenerate after spinal cord injury. Experimentally generated patterns of axon growth are typically disorganized and randomly oriented. Support of linear axonal growth into spinal cord lesion sites has been demonstrated using arrays of uniaxial channels, templated with agarose hydrogel, and containing genetically engineered cells that secrete brain-derived neurotrophic factor (BDNF). However, immobilizing neurotrophic factors secreting cells within a scaffold is relatively cumbersome, and alternative strategies are needed to provide sustained release of BDNF from templated agarose scaffolds. Existing methods of loading the drug or protein into hydrogels cannot provide sustained release from templated agarose hydrogels. Alternatively, here it is shown that pH-responsive H-bonded poly(ethylene glycol)(PEG)/poly(acrylic acid)(PAA)/protein hybrid layer-by-layer (LbL) thin films, when prepared over agarose, provided sustained release of protein under physiological conditions for more than four weeks. Lysozyme, a protein similar in size and isoelectric point to BDNF, is released from the multilayers on the agarose and is biologically active during the earlier time points, with decreasing activity at later time points. This is the first demonstration of month-long sustained protein release from an agarose hydrogel, whereby the drug/protein is loaded separately from the agarose hydrogel fabrication process.
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Affiliation(s)
- Sumit Mehrotra
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, MI (USA)
| | - Daniel Lynam
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, MI (USA)
| | - Ryan Maloney
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, MI (USA)
| | - Kendell M. Pawelec
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, MI (USA)
| | - Mark H. Tuszynski
- Director-Center for Neural Repair, Department of Neurosciences, University of California, San Diego 92093, CA (USA)
| | - Ilsoon Lee
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, MI (USA)
| | - Christina Chan
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, MI (USA)
- Department of Biochemistry and Molecular Biology Michigan State University East Lansing, Michigan 48824, MI (USA)
| | - Jeffrey Sakamoto
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, MI (USA)
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Maiti S, Singha K, Ray S, Dey P, Sa B. Adipic acid dihydrazide treated partially oxidized alginate beads for sustained oral delivery of flurbiprofen. Pharm Dev Technol 2009; 14:461-70. [PMID: 19235554 DOI: 10.1080/10837450802712658] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
In this study, periodate oxidation of sodium alginate was controlled such that the oxidized alginate could form isolatable beads with Ca(+2) ions. The beads of oxidized alginate having a degree of oxidation 1 mol%, entrapped 89% flurbiprofen and released almost all of its content within 1.5 h in pH 7.2 phosphate buffer solution. The beads were covalently crosslinked with adipic dihydrazide (ADH) in addition to ionic crosslinks and were characterized. Scanning electron microscopy revealed that the beads were spherical having smooth surfaces. The drug entrapment efficiency decreased (90-86%) with increasing concentration of ADH (2-6% w/v) in the gelation medium. However, the beads prolonged the drug release in alkaline dissolution medium up to 8 h depending upon the concentration of ADH. The beads prepared with 2% ADH swelled more rapidly and led to faster drug release in either pH 1.2 HCl solution or pH 7.2 phosphate buffer solution. The swelling tendencies were reduced and the drug release became slower with higher concentrations in either fluid. The drug diffusion from the beads followed super case II transport mechanism. FTIR spectroscopy indicated stable nature of flurbiprofen in the beads and therefore had potential as sustained oral delivery system for the drug.
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Affiliation(s)
- Sabyasachi Maiti
- Gupta College of Technological Sciences, Ashram More, T Road, Asansol-713301, Asansol, India.
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Gao C, Liu M, Chen J, Zhang X. Preparation and controlled degradation of oxidized sodium alginate hydrogel. Polym Degrad Stab 2009. [DOI: 10.1016/j.polymdegradstab.2009.05.011] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Preparation of oxidized sodium alginate-graft-poly((2-dimethylamino) ethyl methacrylate) gel beads and in vitro controlled release behavior of BSA. Int J Pharm 2009; 371:16-24. [DOI: 10.1016/j.ijpharm.2008.12.013] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2008] [Revised: 11/07/2008] [Accepted: 12/11/2008] [Indexed: 11/18/2022]
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Tan H, Chu CR, Payne KA, Marra KG. Injectable in situ forming biodegradable chitosan-hyaluronic acid based hydrogels for cartilage tissue engineering. Biomaterials 2009; 30:2499-506. [PMID: 19167750 DOI: 10.1016/j.biomaterials.2008.12.080] [Citation(s) in RCA: 632] [Impact Index Per Article: 42.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2008] [Accepted: 12/29/2008] [Indexed: 12/20/2022]
Abstract
Injectable, biodegradable scaffolds are important biomaterials for tissue engineering and drug delivery. Hydrogels derived from natural polysaccharides are ideal scaffolds as they resemble the extracellular matrices of tissues comprised of various glycosaminoglycans (GAGs). Here, we report a new class of biocompatible and biodegradable composite hydrogels derived from water-soluble chitosan and oxidized hyaluronic acid upon mixing, without the addition of a chemical crosslinking agent. The gelation is attributed to the Schiff base reaction between amino and aldehyde groups of polysaccharide derivatives. In the current work, N-succinyl-chitosan (S-CS) and aldehyde hyaluronic acid (A-HA) were synthesized for preparation of the composite hydrogels. The polysaccharide derivatives and composite hydrogels were characterized by FTIR spectroscopy. The effect of the ratio of S-CS and A-HA on the gelation time, microstructure, surface morphology, equilibrium swelling, compressive modulus, and in vitro degradation of composite hydrogels was examined. The potential of the composite hydrogel as an injectable scaffold was demonstrated by the encapsulation of bovine articular chondrocytes within the composite hydrogel matrix in vitro. The results demonstrated that the composite hydrogel supported cell survival and the cells retained chondrocytic morphology. These characteristics provide a potential opportunity to use the injectable, composite hydrogels in tissue engineering applications.
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Affiliation(s)
- Huaping Tan
- Division of Plastic Surgery, Department of Surgery, University of Pittsburgh, Pittsburgh, PA 15261, USA
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Núñez C, Bastida R, Macías A, Mato-Iglesias M, Platas-Iglesias C, Valencia L. A hexaaza macrocyclic ligand containing acetohydrazide pendants for Ln(iii) complexation in aqueous solution. Solid-state and solution structures and DFT calculations. Dalton Trans 2008:3841-50. [DOI: 10.1039/b800953h] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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42
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Fischbach C, Mooney DJ. Polymers for pro- and anti-angiogenic therapy. Biomaterials 2007; 28:2069-76. [PMID: 17254631 DOI: 10.1016/j.biomaterials.2006.12.029] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2006] [Accepted: 12/07/2006] [Indexed: 02/01/2023]
Abstract
Dysregulated growth factor signaling is traditionally targeted via bolus injections of therapeutic molecules, but this approach may not recreate necessary qualitative and quantitative aspects of biologic growth factor delivery systems. Polymeric delivery systems may, instead, mimic certain sequestration and binding characteristics of the extracellular matrix and lead to the provision of therapeutic molecules at therapeutically efficient local concentrations [V], in the form of spatial gradients (d[V]/dx) and temporal gradients (d[V]/dt), and in combination with other morphogenetic cues. Both physicochemical and biological attributes dictate their design, and they may be fabricated from synthetic and natural polymers. General concepts for manipulating growth factor signaling with these systems are discussed in the context of angiogenesis with vascular endothelial growth factor (VEGF), and these strategies may be broadly adapted to a multitude of other morphogens and growth factors.
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Affiliation(s)
- Claudia Fischbach
- Division of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, MA 02138, USA
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Frullano L, Tejerina B, Meade TJ. Synthesis and Characterization of a Doxorubicin−Gd(III) Contrast Agent Conjugate: A New Approach toward Prodrug−Procontrast Complexes. Inorg Chem 2006; 45:8489-91. [PMID: 17029358 DOI: 10.1021/ic0612045] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have prepared the first MRI prodrug-procontrast complex by conjugating doxorubicin to a Gd(III) chelate using an acid-labile linker. The relaxometric properties of the adduct and pH activation are reported.
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Affiliation(s)
- Luca Frullano
- Department of Chemistry, Biochemistry and Molecular and Cell Biology, Neurobiology and Physiology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA
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Abstract
[Image: see text] Alginate hydrogels are proving to have a wide applicability as biomaterials. They have been used as scaffolds for tissue engineering, as delivery vehicles for drugs, and as model extracellular matrices for basic biological studies. These applications require tight control of a number of material properties including mechanical stiffness, swelling, degradation, cell attachment, and binding or release of bioactive molecules. Control over these properties can be achieved by chemical or physical modifications of the polysaccharide itself or the gels formed from alginate. The utility of these modified alginate gels as biomaterials has been demonstrated in a number of in vitro and in vivo studies.Micro-CT images of bone-like constructs that result from transplantation of osteoblasts on gels that degrade over a time frame of several months leading to improved bone formation.
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Affiliation(s)
- Alexander D Augst
- Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA.
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Nuttelman CR, Tripodi MC, Anseth KS. Dexamethasone-functionalized gels induce osteogenic differentiation of encapsulated hMSCs. J Biomed Mater Res A 2006; 76:183-95. [PMID: 16265650 DOI: 10.1002/jbm.a.30537] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Synthetic hydrogels represent highly controlled environments for three-dimensional culture of human mesenchymal stem cells (hMSCs). Encapsulated hMSCs are presented with a "blank" environment, and this environment can be closely controlled in order to elicit an osteogenic response. In vitro, dexamethasone is an efficient and reliable factor that leads to the osteogenic differentiation of human mesenchymal stem cells (hMSCs). The aim of this work was to develop a dexamethasone-releasing poly(ethylene glycol) (PEG)-based hydrogel scaffold to deliver dexamethasone to encapsulated cells in a sustained manner. To accomplish this goal, dexamethasone was covalently linked to a photoreactive mono-acrylated PEG molecule through a degradable lactide bond, and this molecule was covalently incorporated into the PEG hydrogel during photopolymerization. Over time, hydrolysis of the ester bonds resulted in dexamethasone release from the gel. The biological activity of the released dexamethasone was verified in monolayer cell culture and in three-dimensional culture (i.e., in the gel) by the ability of hMSCs to express osteogenic genes, including alkaline phosphatase, osteopontin, and core binding factor alpha 1, as measured using real-time reverse transcription polymerase chain reaction (RT-PCR). These studies indicate that encapsulated hMSCs are capable of osteogenic differentiation in response to released dexamethasone.
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Affiliation(s)
- Charles R Nuttelman
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309-0424, USA
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Dulong V, Cerf DL, Picton L, Muller G. Carboxymethylpullulan hydrogels with a ionic and/or amphiphilic behavior: Swelling properties and entrapment of cationic and/or hydrophobic molecules. Colloids Surf A Physicochem Eng Asp 2006. [DOI: 10.1016/j.colsurfa.2005.08.045] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Schoenmakers RG, van de Wetering P, Elbert DL, Hubbell JA. The effect of the linker on the hydrolysis rate of drug-linked ester bonds. J Control Release 2004; 95:291-300. [PMID: 14980777 DOI: 10.1016/j.jconrel.2003.12.009] [Citation(s) in RCA: 139] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2003] [Revised: 11/30/2003] [Accepted: 12/09/2003] [Indexed: 11/25/2022]
Abstract
Tailoring the length of a sulfide containing linker adjusts the hydrolysis of a drug-linked ester bond to values appropriate for once-a-week administrations. A model drug of paclitaxel was coupled using a hydrolyzable linker to a poly(ethylene glycol) macromonomer, via a conjugate addition reaction between a thiol and an acrylamide. The macromonomers were synthesized in three steps with an average overall yield of 70%. By changing the length of the linker from 3-sulfanylpropionyl to 4-sulfanylbutyryl, the half-life time of the release of the drug could be increased from 4.2+/-0.1 to 14.0+/-0.2 days. Drug-containing hydrogels were prepared by radical photopolymerization of these macromonomers with either the 3-sulfanylpropionyl or the 4-sulfanylbutyryl linker. The release of the drug from these hydrogels followed similar trends as the release of the drug from the soluble polymer-drug conjugates. The synthetic methodology employed does not involve the use of coupling reagents in the final conjugation between the drug and the polymer, excluding the presence of potential toxic residuals. The conjugation method is relatively simple and is applicable to nearly any hydroxyl-containing drugs.
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Affiliation(s)
- Ronald G Schoenmakers
- Institute for Biomedical Engineering, ETH and University of Zurich, Moussonstrasse 18, CH-8044 Zurich, Switzerland.
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Alsberg E, Kong HJ, Hirano Y, Smith MK, Albeiruti A, Mooney DJ. Regulating bone formation via controlled scaffold degradation. J Dent Res 2003; 82:903-8. [PMID: 14578503 DOI: 10.1177/154405910308201111] [Citation(s) in RCA: 231] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
It is widely assumed that coupling the degradation rate of polymers used as cell transplantation carriers to the growth rate of the developing tissue will improve its quantity or quality. To test this hypothesis, we developed alginate hydrogels with a range of degradation rates by gamma-irradiating high-molecular-weight alginate to yield polymers of various molecular weights and structures. Decreasing the size of the polymer chains increased the degradation rate in vivo, as measured by implant retrieval rates, masses, and elastic moduli. Rapidly and slowly degrading alginates, covalently modified with RGD-containing peptides to control cell behavior, were then used to investigate the effect of biodegradation rate on bone tissue development in vivo. The more rapidly degrading gels led to dramatic increases in the extent and quality of bone formation. These results indicate that biomaterial degradability is a critical design criterion for achieving optimal tissue regeneration with cell transplantation.
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Affiliation(s)
- E Alsberg
- Department of Biomedical Engineering, University of Michigan, Ann Arbor 48109-1078, USA
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Abstract
There is a tremendous need for organs and tissues to replace those lost due to diseases or trauma. In theory, transplanting cells on biomaterial matrices can create functional tissue. A critical question, however, is how to supply cells embedded within large cell-polymer constructs with sufficient oxygen and nutrients to sustain their survival and proliferation, and allow for the integration of the developing tissue with the surrounding tissue. A rapid and high level of vascularization of transplanted polymer-cell matrices is essential in tissue engineering approaches to meet these challenges. This review summarizes the current approaches and materials under development in our laboratory to promote angiogenesis in engineered tissues.
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Affiliation(s)
- K H Bouhadir
- Department of Chemistry, American University of Beirut, Lebanon
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Abstract
Hydrogels are presently under investigation as matrices for the controlled release of bioactive molecules, in particular pharmaceutical proteins, and for the encapsulation of living cells. For these applications, it is often required that the gels degrade under physiological conditions. This means that the originally three-dimensional structure has to disintegrate preferably in harmless products to ensure a good biocompatibility of the hydrogel. In this overview, different chemical and physical crosslinking methods used for the design of biodegradable hydrogels are summarized and discussed. Chemical crosslinking is a highly versatile method to create hydrogels with good mechanical stability. However, the crosslinking agents used are often toxic compounds, which have been extracted from the gels before they can be applied. Moreover, crosslinking agents can give unwanted reactions with the bioactive substances present in the hydrogel matrix. Such adverse effects are avoided with the use of physically crosslinked gels.
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Affiliation(s)
- W E Hennink
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80.082, 3508 TB Utrecht, The Netherlands.
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