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Drozdov A, deClaville Christiansen J. A simplified model for equilibrium and transient swelling of thermo-responsive gels. J Mech Behav Biomed Mater 2017; 75:20-32. [DOI: 10.1016/j.jmbbm.2017.06.034] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 06/26/2017] [Indexed: 11/25/2022]
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Zhuang M, Liu T, Song K, Ge D, Li X. Thermo-responsive poly(N-isopropylacrylamide)-grafted hollow fiber membranes for osteoblasts culture and non-invasive harvest. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 55:410-9. [PMID: 26117772 DOI: 10.1016/j.msec.2015.05.040] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Revised: 04/21/2015] [Accepted: 05/08/2015] [Indexed: 12/29/2022]
Abstract
Hollow fiber membrane (HFM) culture system is one of the most important bioreactors for the large-scale culture and expansion of therapeutic cells. However, enzymatic and mechanical treatments are traditionally applied to harvest the expanded cells from HFMs, which inevitably causes harm to the cells. In this study, thermo-responsive cellulose acetate HFMs for cell culture and non-invasive harvest were prepared for the first time via free radical polymerization in the presence of cerium (IV). ATR-FTIR and elemental analysis results indicated that the poly(N-isopropylacrylamide) (PNIPAAm) was covalently grafted on HFMs successfully. Dynamic contact angle measurements at different temperatures revealed that the magnitude of volume phase transition was decreased with increasing grafted amount of PNIPAAm. And the amount of serum protein adsorbed on HFMs surface also displayed the same pattern. Meanwhile osteoblasts adhered and spread well on the surface of PNIPAAm-grafted HFMs at 37 °C. And Calcein-AM/PI staining, AB assay, ALP activity and OCN protein expression level all showed that PNIPAAm-grafted HFMs had good cell compatibility. After incubation at 20 °C for 120 min, the adhering cells on PNIPAAm-grafted HFMs turned to be round and detached after being gently pipetted. These results suggest that thermo-responsive HFMs are attractive cell culture substrates which enable cell culture, expansion and the recovery without proteolytic enzyme treatment for the application in tissue engineering and regenerative medicine.
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Affiliation(s)
- Meiling Zhuang
- Dalian R&D Center for Stem Cell and Tissue Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China.
| | - Tianqing Liu
- Dalian R&D Center for Stem Cell and Tissue Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China.
| | - Kedong Song
- Dalian R&D Center for Stem Cell and Tissue Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China.
| | - Dan Ge
- Dalian R&D Center for Stem Cell and Tissue Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China.
| | - Xiangqin Li
- Dalian R&D Center for Stem Cell and Tissue Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China.
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Vermonden T, Jena SS, Barriet D, Censi R, van der Gucht J, Hennink WE, Siegel RA. Macromolecular Diffusion in Self-Assembling Biodegradable Thermosensitive Hydrogels. Macromolecules 2010; 43:782-789. [PMID: 20885989 PMCID: PMC2946210 DOI: 10.1021/ma902186e] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Hydrogel formation triggered by a change in temperature is an attractive mechanism for in situ gelling biomaterials for pharmaceutical applications such as the delivery of therapeutic proteins. In this study, hydrogels were prepared from ABA triblock polymers having thermosensitive poly(N-(2-hydroxypropyl) methacrylamide lactate) flanking A-blocks and hydrophilic poly(ethylene glycol) B-blocks. Polymers with fixed length A blocks (~22 kDA) but differing PEG-midblock lengths (2, 4 and 10 kDa) were synthesized and dissolved in water with dilute fluorescein isothiocyanate (FITC)-labeled dextrans (70 and 500 kDA). Hydrogels encapsulating the dextrans were formed by raising the temperature. Fluorescence recovery after photobleaching (FRAP) studies showed that diffusion coefficients and mobile fractions of the dextran dyes decreased upon elevating temperatures above 25 °C. Confocal laser scanning microscopy and cryo-SEM demonstrated that hydrogel structure depended on PEG block length. Phase separation into polymer-rich and water-rich domains occurred to a larger extent for polymers with small PEG blocks compared to polymers with a larger PEG block. By changing the PEG block length and thereby the hydrogel structure, mobility of FITC-dextran could be tailored. At physiological pH the hydrogels degraded over time by ester hydrolysis, resulting in increased mobility of the encapsulated dye. Since diffusion can be controlled according to polymer design and concentration, plus temperature, these biocompatible hydrogels are attractive as potential in situ gelling biodegradable materials for macromolecular drug delivery.
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Affiliation(s)
- Tina Vermonden
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, P.O. Box 80082, 3508 TB, Utrecht, The Netherlands
- Department of Pharmaceutics, University of Minnesota, Minneapolis, MN 55455, USA
| | - Sidhartha S. Jena
- Department of Pharmaceutics, University of Minnesota, Minneapolis, MN 55455, USA
- Department of Physics, National Institute of Technology, Rourkela, Rourkela 769008, Orissa, India
| | - David Barriet
- Department of Pharmaceutics, University of Minnesota, Minneapolis, MN 55455, USA
| | - Roberta Censi
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, P.O. Box 80082, 3508 TB, Utrecht, The Netherlands
| | - Jasper van der Gucht
- Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6703 HB Wageningen, The Netherlands
| | - Wim E. Hennink
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, P.O. Box 80082, 3508 TB, Utrecht, The Netherlands
| | - Ronald A. Siegel
- Department of Pharmaceutics, University of Minnesota, Minneapolis, MN 55455, USA
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN 55455, USA
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Banet P, Griesmar P, Serfaty S, Vidal F, Jaouen V, Le Huerou JY. One-shot synthesis of a poly(N-isopropylacrylamide)/silica hybrid gel. J Phys Chem B 2010; 113:14914-9. [PMID: 19888763 DOI: 10.1021/jp906229n] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Class I hybrid poly(N-isopropylacrylamide)/silica hydrogels, PNIPAM/SiO2, were prepared by a new one shot synthesis. In this approach, the free-radical polymerization of vinyl groups of N-isopropylacrylamide (NIPAM) and the hydrolysis-condensation of alkoxy groups of tetramethoxysilane (TMOS) are performed concomitantly using sodium persulfate and 3-(dimethylamino)-propionitrile, a well-known couple to initiate the organic polymerization. The cross-linker is N,N-methylenebisacrylamide. The kinetic study of mechanical properties from the sol-to-gel state for different ratios of TMOS/NIPAM was investigated by rheological ultrasonic measurements. The thermoresponse of hybrid materials was investigated by differential scanning calorimetry and the measurements showed that hybrid gels present a lower critical solution temperature, which is similar with one of single organic hydrogel.
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Affiliation(s)
- P Banet
- Université de Cergy-Pontoise, ENSEA, ECIME, F-95000 Cergy-Pontoise, France.
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Ru G, Wang N, Huang S, Feng J. 1H HRMAS NMR Study on Phase Transition of Poly(N-isopropylacrylamide) Gels with and without Grafted Comb-Type Chains. Macromolecules 2009. [DOI: 10.1021/ma802780d] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Geying Ru
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Science, Wuhan 430071, P. R. China, and Graduate School, Chinese Academy of Science, Beijing 100029, P. R. China
| | - Nian Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Science, Wuhan 430071, P. R. China, and Graduate School, Chinese Academy of Science, Beijing 100029, P. R. China
| | - Shaohua Huang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Science, Wuhan 430071, P. R. China, and Graduate School, Chinese Academy of Science, Beijing 100029, P. R. China
| | - Jiwen Feng
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Science, Wuhan 430071, P. R. China, and Graduate School, Chinese Academy of Science, Beijing 100029, P. R. China
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Chen X, Tsujii K. A Novel Hydrogel Showing Super-Rapid Shrinking but Slow Swelling Behavior. Macromolecules 2006. [DOI: 10.1021/ma061799n] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xinjiang Chen
- Nanotechnology Research Center, Research Institute for Electronic Science, Hokkaido University, N-21, W-10, Kita-ku, Sapporo 001-0021, Japan; Graduate School of Science, Hokkaido University, N-10, W-8, Kita-ku, Sapporo 060-0810, Japan; and JST, CREST
| | - Kaoru Tsujii
- Nanotechnology Research Center, Research Institute for Electronic Science, Hokkaido University, N-21, W-10, Kita-ku, Sapporo 001-0021, Japan; Graduate School of Science, Hokkaido University, N-10, W-8, Kita-ku, Sapporo 060-0810, Japan; and JST, CREST
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