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Jixuan W, Chunxia Z, Yunchao L, Yuntao L, Zhangmei S, Dong X, Hui L. A simple and green strategy for preparing poly(vinyl alcohol)/phosphate cellulose aerogel with enhanced
flame‐retardant
properties. POLYM ENG SCI 2021. [DOI: 10.1002/pen.25609] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Wei Jixuan
- School of New Energy and Materials Southwest Petroleum University Chengdu China
| | - Zhao Chunxia
- School of New Energy and Materials Southwest Petroleum University Chengdu China
| | - Li Yunchao
- School of New Energy and Materials Southwest Petroleum University Chengdu China
| | - Li Yuntao
- School of New Energy and Materials Southwest Petroleum University Chengdu China
- State key laboratory Southwest Petroleum University Chengdu China
| | - Sun Zhangmei
- School of New Energy and Materials Southwest Petroleum University Chengdu China
| | - Xiang Dong
- School of New Energy and Materials Southwest Petroleum University Chengdu China
| | - Li Hui
- School of New Energy and Materials Southwest Petroleum University Chengdu China
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Kim SM, Ueki M, Ren X, Akimoto J, Sakai Y, Ito Y. Micropatterned nanolayers immobilized with nerve growth factor for neurite formation of PC12 cells. Int J Nanomedicine 2019; 14:7683-7694. [PMID: 31571871 PMCID: PMC6756831 DOI: 10.2147/ijn.s217416] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Accepted: 08/08/2019] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Nerve regeneration is important for the treatment of degenerative diseases and neurons injured by accidents. Nerve growth factor (NGF) has been previously conjugated to materials for promotion of neurogenesis. MATERIALS AND METHODS Photoreactive gelatin was prepared by chemical coupling of gelatin with azidobenzoic acid (P-gel), and then NGF was immobilized on substrates in the presence or absence of micropatterned photomasks. UV irradiation induced crosslinking reactions of P-gel with itself, NGF, and the plate for immobilization. RESULTS By adjustment of the P-gel concentration, the nanometer-order height of micropatterns was controlled. NGF was quantitatively immobilized with increasing amounts of P-gel. Immobilized NGF induced neurite outgrowth of PC12 cells, a cell line derived from a pheochromocytoma of the rat adrenal medulla, at the same level as soluble NGF. The immobilized NGF showed higher thermal stability than the soluble NGF and was repeatedly used without loss of biological activity. The 3D structure (height of the formed micropattern) regulated the behavior of neurite guidance. As a result, the orientation of neurites was regulated by the stripe pattern width. CONCLUSION The micropattern-immobilized NGF nanolayer biochemically and topologically regulated neurite formation.
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Affiliation(s)
- Seong Min Kim
- Nano Medical Engineering Laboratory, RIKEN Cluster for Pioneering Research, Wako, Saitama351-0198, Japan
- Department of Bioengineering, School of Engineering, The University of Tokyo, Tokyo113-8656, Japan
| | - Masashi Ueki
- Nano Medical Engineering Laboratory, RIKEN Cluster for Pioneering Research, Wako, Saitama351-0198, Japan
| | - Xueli Ren
- Emergent Bioengineering Materials Research Team, RIKEN Center for Emergent Matter Science, Wako, Saitama351-0198, Japan
| | - Jun Akimoto
- Nano Medical Engineering Laboratory, RIKEN Cluster for Pioneering Research, Wako, Saitama351-0198, Japan
| | - Yasuyuki Sakai
- Department of Bioengineering, School of Engineering, The University of Tokyo, Tokyo113-8656, Japan
| | - Yoshihiro Ito
- Nano Medical Engineering Laboratory, RIKEN Cluster for Pioneering Research, Wako, Saitama351-0198, Japan
- Emergent Bioengineering Materials Research Team, RIKEN Center for Emergent Matter Science, Wako, Saitama351-0198, Japan
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4
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Affiliation(s)
- Yoshihiro Ito
- Nano Medical Engineering Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Emergent Bioengineering Materials Research Team, RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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Gao T, Jiang M, Liu X, You G, Wang W, Sun Z, Ma A, Chen J. Patterned Polyvinyl Alcohol Hydrogel Dressings with Stem Cells Seeded for Wound Healing. Polymers (Basel) 2019; 11:E171. [PMID: 30960155 PMCID: PMC6401986 DOI: 10.3390/polym11010171] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2018] [Revised: 01/15/2019] [Accepted: 01/15/2019] [Indexed: 12/11/2022] Open
Abstract
Polyvinyl alcohol (PVA) hydrogel and stem cell therapy have been widely used in wound healing. However, the lack of bioactivity for PVA and security of stem therapy limited their application. In this study, an adipose-derived stem cells (ADSCs)-seeded PVA dressing (ADSCs/PVA) was prepared for wound healing. One side of the PVA dressing was modified with photo-reactive gelatin (Az-Gel) via ultraviolet (UV) irradiation (Az-Gel@PVA), and thus ADSCs could adhere, proliferate on the PVA dressings and keep the other side of the dressings without adhering to the wound. The structure and mechanics of Az-Gel@PVA were determined by scanning electron microscopy (SEM) and material testing instruments. Then, the adhesion and proliferation of ADSCs were observed via cell counts and live-dead staining. Finally, in vitro and in vivo experiments were utilized to confirm the effect of ADSCs/PVA dressing for wound healing. The results showed that Az-Gel was immobilized on the PVA and showed little effect on the mechanical properties of PVA hydrogels. The surface-modified PVA could facilitate ADSCs adhesion and proliferation. Protein released tests indicated that the bioactive factors secreted from ADSCs could penetrated to the wound. Finally, in vitro and in vivo experiments both suggested the ADSCs/PVA could promote the wound healing via secreting bioactive factors from ADSCs. It was speculated that the ADSCs/PVA dressing could not only promote the wound healing, but also provide a new way for the safe application of stem cells, which would be of great potential for skin tissue engineering.
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Affiliation(s)
- Tianlin Gao
- The College of Medical, Qingdao University, Qingdao 266021, China.
| | - Menghui Jiang
- The College of Medical, Qingdao University, Qingdao 266021, China.
| | - Xiaoqian Liu
- The College of Medical, Qingdao University, Qingdao 266021, China.
| | - Guoju You
- The College of Medical, Qingdao University, Qingdao 266021, China.
| | - Wenyu Wang
- The College of Medical, Qingdao University, Qingdao 266021, China.
| | - Zhaohui Sun
- The College of Medical, Qingdao University, Qingdao 266021, China.
| | - Aiguo Ma
- The College of Medical, Qingdao University, Qingdao 266021, China.
| | - Jie Chen
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
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6
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Visible and UV-curable chitosan derivatives for immobilization of biomolecules. Int J Biol Macromol 2017; 104:1611-1619. [DOI: 10.1016/j.ijbiomac.2017.04.115] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 03/13/2017] [Accepted: 04/30/2017] [Indexed: 11/20/2022]
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7
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Mao H, Kim SM, Ueki M, Ito Y. Serum-free culturing of human mesenchymal stem cells with immobilized growth factors. J Mater Chem B 2017; 5:928-934. [DOI: 10.1039/c6tb02867e] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Growth factors were immobilized with photo-reactive gelatin and used for serum-free human mesenchymal stem cell (hMSC) culturing.
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Affiliation(s)
- Hongli Mao
- Nano Medical Engineering Laboratory
- RIKEN
- Wako
- Japan
| | | | - Masashi Ueki
- Nano Medical Engineering Laboratory
- RIKEN
- Wako
- Japan
| | - Yoshihiro Ito
- Nano Medical Engineering Laboratory
- RIKEN
- Wako
- Japan
- Emergent Bioengineering Materials Research Team
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8
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Photo-immobilization of bone morphogenetic protein-2 using azidophenyl gelatin on a collagen sheet enhances osteogenesis in a rat calvarial defect model. J IND ENG CHEM 2016. [DOI: 10.1016/j.jiec.2016.06.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Heo Y, Kim EH, Kobatake E, Nah JW, Ito Y, Son TI. Preparation of phosphonated gelatin-coated titanium containing rhBMP-2 by UV irradiation for improved osteoinduction and function. J IND ENG CHEM 2016. [DOI: 10.1016/j.jiec.2016.01.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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10
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Gao T, Cui W, Wang Z, Wang Y, Liu Y, Malliappan PS, Ito Y, Zhang P. Photo-immobilization of bone morphogenic protein 2 on PLGA/HA nanocomposites to enhance the osteogenesis of adipose-derived stem cells. RSC Adv 2016. [DOI: 10.1039/c5ra27914c] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Poly(lactide-co-glycolide) and nano-hydroxyapatite composites are surface-modified with BMP-2 via photo-reactive gelatin to make the composites exhibit excellent bioactivities for the adhesion, proliferation and osteogenic differentiation of ADSCs.
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Affiliation(s)
- Tianlin Gao
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- China
| | - Weiwei Cui
- School of Public Health
- Jilin University
- Changchun
- P. R. China
| | - Zongliang Wang
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- China
| | - Yu Wang
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- China
| | - Ya Liu
- School of Public Health
- Jilin University
- Changchun
- P. R. China
| | | | - Yoshihiro Ito
- Nano Medical Engineering Laboratory
- RIKEN
- Saitama 351-0198
- Japan
- Emergent Bioengineering Materials Research Team
| | - Peibiao Zhang
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- China
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Zhou X, Park SH, Mao H, Isoshima T, Wang Y, Ito Y. Nanolayer formation on titanium by phosphonated gelatin for cell adhesion and growth enhancement. Int J Nanomedicine 2015; 10:5597-607. [PMID: 26366080 PMCID: PMC4562736 DOI: 10.2147/ijn.s82166] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Phosphonated gelatin was prepared for surface modification of titanium to stimulate cell functions. The modified gelatin was synthesized by coupling with 3-aminopropylphosphonic acid using water-soluble carbodiimide and characterized by (31)P nuclear magnetic resonance and gel permeation chromatography. Circular dichroism revealed no differences in the conformations of unmodified and phosphonated gelatin. However, the gelation temperature was changed by the modification. Even a high concentration of modified gelatin did not form a gel at room temperature. Time-of-flight secondary ion mass spectrometry showed direct bonding between the phosphonated gelatin and the titanium surface after binding. The binding behavior of phosphonated gelatin on the titanium surface was quantitatively analyzed by a quartz crystal microbalance. Ellipsometry showed the formation of a several nanometer layer of gelatin on the surface. Contact angle measurement indicated that the modified titanium surface was hydrophobic. Enhancement of the attachment and spreading of MC-3T3L1 osteoblastic cells was observed on the phosphonated gelatin-modified titanium. These effects on cell adhesion also led to growth enhancement. Phosphonation of gelatin was effective for preparation of a cell-stimulating titanium surface.
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Affiliation(s)
- Xiaoyue Zhou
- Nano Medical Engineering Laboratory, RIKEN, Wako, Saitama, Japan
- Department of Regenerative Medicine, School of Pharmaceutical Sciences, Jilin University, Changchun, Jilin, People’s Republic of China
| | - Shin-Hye Park
- Nano Medical Engineering Laboratory, RIKEN, Wako, Saitama, Japan
| | - Hongli Mao
- Emergent Bioengineering Materials Research Team, RIKEN Center for Emergent Matter Science, Wako, Saitama, Japan
| | - Takashi Isoshima
- Nano Medical Engineering Laboratory, RIKEN, Wako, Saitama, Japan
| | - Yi Wang
- Department of Regenerative Medicine, School of Pharmaceutical Sciences, Jilin University, Changchun, Jilin, People’s Republic of China
| | - Yoshihiro Ito
- Nano Medical Engineering Laboratory, RIKEN, Wako, Saitama, Japan
- Emergent Bioengineering Materials Research Team, RIKEN Center for Emergent Matter Science, Wako, Saitama, Japan
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12
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Immobilization effect of bone morphogenetic protein-2 on collagen membrane via photoreactive gelatin derivatives: Biocompatibility and preservability of osteoinductive activity. Macromol Res 2015. [DOI: 10.1007/s13233-015-3068-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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13
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Chen HB, Liu B, Huang W, Wang JS, Zeng G, Wu WH, Schiraldi DA. Fabrication and properties of irradiation-cross-linked poly(vinyl alcohol)/clay aerogel composites. ACS APPLIED MATERIALS & INTERFACES 2014; 6:16227-16236. [PMID: 25164075 DOI: 10.1021/am504418w] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Poly(vinyl alcohol) (PVOH)/clay aerogel composites were fabricated by an environmentally friendly freeze-drying of the aqueous precursor suspensions, followed by cross-linking induced by gamma irradiation without chemical additives. The influences of cross-linking conditions, i.e., absorbed dose and polymer loading as well as density on the aerogel structure and properties, were investigated. The absorbed dose of 30 kGy was found to be the optimum dose for fabricating strong PVOH composites; the compressive modulus of an aerogel prepared from an aqueous suspension containing 2 wt % PVOH/8 wt % clay increased 10-fold, and that containing 1 wt % PVOH/9 wt % clay increased 12 times upon cross-linking with a dose of 30 kGy. Increasing the solids concentration led to an increase in the mechanical strength, in accordance with the changes in microstructure from layered structure to network structure. The increase of absorbed dose also led to decreased porous size of the network structure. Cross-linking and the increase of the PVOH lead to decreased thermal stability. The strengthened PVOH/clay aerogels possess very low flammability, as measured by cone calorimetry, with heat, smoke, and volatile products release value decreasing as increasing clay content. The mechanism of flame retardation in these materials was investigated with weight loss, FTIR, WAXD, and SEM of the burned residues. The proposed mechanism is that with decreasing fuel content (increasing clay content), increased heat and mass transport barriers are developed; simultaneously low levels of thermal conductivity are maintained during the burning.
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Affiliation(s)
- Hong-Bing Chen
- Institute of Nuclear Physics and Chemistry, Chinese Academy of Engineering Physics , Mianyang, Sichuan 621000, China
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The immobilization of bone morphogenetic protein-2 via photo curable azidophenyl hyaluronic acid on a titanium surface and providing effect for cell differentiation. Macromol Res 2014. [DOI: 10.1007/s13233-014-2032-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Park SH, Zhu L, Tada S, Obuse S, Yoshida Y, Nakamura M, Son TI, Tsuneda S, Ito Y. Phosphorylated gelatin to enhance cell adhesion to titanium. POLYM INT 2013. [DOI: 10.1002/pi.4647] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Shin-Hye Park
- Nano Medical Engineering Laboratory; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
- Department of Life Science and Medical Bio-Science, Waseda University; 2-2 Wakamatsu-cho; Shinjuku-ku Tokyo 162-8480 Japan
| | - Liping Zhu
- Nano Medical Engineering Laboratory; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
| | - Seiichi Tada
- Nano Medical Engineering Laboratory; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
| | - Sei Obuse
- Nano Medical Engineering Laboratory; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
| | - Yasuhiro Yoshida
- Nano Medical Engineering Laboratory; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
- Department of Biomaterials, Okayama University Graduate School of Medicine; Dentistry and Pharmaceutical Sciences; 2-5-1 Shikata-Cho Kikta-Ku, Okayama 700-8558 Japan
| | - Mariko Nakamura
- Nano Medical Engineering Laboratory; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
- Dental Hygiene Program; Kibi International College; 8 Iga-cho, Takahashi Okayama 716-8508 Japan
| | - Tae Il Son
- Nano Medical Engineering Laboratory; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
- Department of Bioscience and Biotechnology; Chung-Ang University; 40-1 San, Nae-Ri, Daeduck-myun Ansung-si Kyungki-do 456-756 Korea
| | - Satoshi Tsuneda
- Nano Medical Engineering Laboratory; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
- Department of Life Science and Medical Bio-Science, Waseda University; 2-2 Wakamatsu-cho; Shinjuku-ku Tokyo 162-8480 Japan
| | - Yoshihiro Ito
- Nano Medical Engineering Laboratory; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
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Sivakumar PM, Zhou D, Son TI, Ito Y. Design and Synthesis of Photoreactive Polymers for Biomedical Applications. Biomimetics (Basel) 2013. [DOI: 10.1002/9781118810408.ch11] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
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18
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Guan YQ, Li Z, Yang A, Huang Z, Zheng Z, Zhang L, Li L, Liu JM. Cell cycle arrest and apoptosis of OVCAR-3 and MCF-7 cells induced by co-immobilized TNF-α plus IFN-γ on polystyrene and the role of p53 activation. Biomaterials 2012; 33:6162-71. [PMID: 22682938 DOI: 10.1016/j.biomaterials.2012.05.037] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Accepted: 05/17/2012] [Indexed: 01/24/2023]
Abstract
The aim of this study is to reveal the biological mechanism for high anti-cancer efficiency of co-immobilized TNF-α plus IFN-γ polymeric drug (co-immobilized drug) in mediating two gynecologic cancer cell lines: MCF-7 and OVCAR-3. The co-immobilized drug is prepared by mixing 10 ng/ml TNF-α plus 10 ng/ml IFN-γ which are then photo-immobilized onto cell culture polystyrene plates. The drug compositions and microstructures are characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. The MCF-7 and OVCAR-3 cell cycle arrest and programmed cell death are checked by flow cytometry, and the expression of p53 is probed by immunofluorescence staining. The phosphorylation sites of the p53 regulation and the apoptosis key protein expressions of caspase 3, 8 and 9 are detected by western blot assay. Our data show that, in case of short treatment time (48 h) at low cytokine concentrations (20 ng/ml), the co-immobilized drug demonstrates visible effects in comparison with the treatment using TNF-α plus IFN-γ freely attached on the polymeric plate (free drug). It is revealed that the co-immobilized drug leads to significant cell arrest in the S phase or G(1) and G(2) phase and offer high efficiency in mediating a caspase-dependent apoptosis via p53 transcriptional regulation. Moreover, upon the treatment by the co-immobilized drug, the two gynecologic cancer cell lines show different phosphorylation sites of p53 and then different caspase-dependent apoptosis pathways. The present work sheds deep insights into the p53 regulation mechanism responsible for the high anti-cancer efficiency of the co-immobilized TNF-α plus IFN-γ polymeric drug against MCF-7 and OVCAR-3.
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Affiliation(s)
- Yan-Qing Guan
- School of Life Science and Institute for Advanced Materials, South China Normal University, Guangzhou 510631, China
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Guan YQ, Zheng Z, Liang L, Li Z, Zhang L, Du J, Liu JM. The apoptosis of OVCAR-3 induced by TNF-α plus IFN-γ co-immobilized polylactic acid copolymers. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm31972a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Kitajima T, Obuse S, Adachi T, Tomita M, Ito Y. Recombinant human gelatin substitute with photoreactive properties for cell culture and tissue engineering. Biotechnol Bioeng 2011; 108:2468-76. [PMID: 21538336 DOI: 10.1002/bit.23192] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2011] [Revised: 04/06/2011] [Accepted: 04/15/2011] [Indexed: 11/07/2022]
Abstract
The human recombinant collagen I α1 chain monomer (rh-gelatin) was modified by the incorporation of an azidophenyl group to prepare photoreactive human gelatin (Az-rh-gelatin), with approximately 90% of the lysine residues conjugated with azidobenzoic acid. Slight changes in conformation (circular dichroism spectra) and thermal properties (gelation and melting points) were noticed after modification. Ultraviolet (UV) irradiation could immobilize the Az-rh-gelatin on polymer surfaces, such as polystyrene and polytetrafluoroethylene. Az-rh-gelatin was stably retained on the polymer surfaces, while unmodified gelatin was mostly lost by brief washing. Human mesenchymal cells grew more efficiently on the immobilized surface than on the coated surface. The immobilized Az-rh-gelatin on the polymer surfaces was able to capture engineered growth factors with collagen affinity, and the bound growth factors stimulated the growth of cells dose-dependently. It was also possible to immobilize Az-rh-gelatin in micropatterns (stripe, grid, and so on) using photomasks, and the cells grew according to the patterns. These results suggest that the photoreactive human gelatin, in combination with collagen-binding growth factors, will be clinically useful for surface modification of synthetic materials for cell culture systems and tissue engineering.
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Affiliation(s)
- Takashi Kitajima
- Nano Medical Engineering Laboratory, RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako-shi, Saitama 351-0198 Japan
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Guan YQ, Li Z, Chen J, Tao H, Wang W, Zheng Z, Li L, Liu JM. Pathway of programmed cell death in HeLa cells induced by polymeric anti-cancer drugs. Biomaterials 2011; 32:3637-46. [DOI: 10.1016/j.biomaterials.2011.01.060] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2011] [Accepted: 01/20/2011] [Indexed: 02/02/2023]
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Guan YQ, Chen JM, Li ZB, Feng QL, Liu JM. Immobilisation of bifenthrin for termite control. PEST MANAGEMENT SCIENCE 2011; 67:244-251. [PMID: 21104824 DOI: 10.1002/ps.2065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
BACKGROUND Termites are worldwide pests causing considerable damage to agriculture, forestry and buildings. While various approaches have been tried to eliminate termite populations, the relevant toxicants are associated with certain risks to the environment and human health. RESULTS In this study, to combine the merits of effective chemical control by bifenthrin and a drug photoimmobilisation technique, silk fibroin was used as a carrier to embed bifenthrin, which was then photoactively immobilised by ultraviolet treatment on the surface of wood (cellulose). The immobilised bifenthrin embedded in the photoactive silk fibroin was characterised by Fourier transform infrared spectroscopy (FTIR), ultraviolet absorption spectroscopy (UV), fluorescence measurement and CHN analysis. The surface structures and biological activity were examined by scanning electron microscopy (SEM), atomic force microscopy (AFM), electron spectroscopy for chemical analysis (ESCA) and bioassays respectively. CONCLUSIONS The results indicate that the embedded and immobilised bifenthrin has been very well protected from free release and has a long-term stability allowing slow release with a high efficiency against termites at a low dose of 1.25 µg cm(-2). This study provides a novel and environmentally benign technique for termite control by photoimmobilising silk-fibroin-embedded bifenthrin on the surface of materials that are otherwise easily attacked by termites.
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Affiliation(s)
- Yan-Qing Guan
- School of Life Science and MOE Key Laboratory of Laser Life Science, South China Normal University, Guangzhou 510631, China
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Na HN, Kim KI, Han JH, Lee JG, Son TI, Han DK, Ito Y, Song KS, Jang EC. Synthesis of O-carboxylated low molecular chitosan with azido phenyl group: Its application for adhesion prevention. Macromol Res 2010. [DOI: 10.1007/s13233-010-1007-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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24
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Son TI, Sakuragi M, Takahashi S, Obuse S, Kang J, Fujishiro M, Matsushita H, Gong J, Shimizu S, Tajima Y, Yoshida Y, Suzuki K, Yamamoto T, Nakamura M, Ito Y. Visible light-induced crosslinkable gelatin. Acta Biomater 2010; 6:4005-10. [PMID: 20580950 DOI: 10.1016/j.actbio.2010.05.018] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2009] [Revised: 05/14/2010] [Accepted: 05/19/2010] [Indexed: 11/17/2022]
Abstract
A novel visible light-crosslinkable porcine gelatin was prepared for gelation and micropatterning. The preparation employed a photo-oxidation-induced crosslinking mechanism. First, furfuryl groups were incorporated into the gelatin. Second, the modified gelatin was mixed in water with Rose Bengal, which is a visible light sensitizer. Irradiation by visible light solidified the aqueous solution. In addition, when the solution was cast on a plate, dried and photo-irradiated in the presence of a photomask a micropattern was formed that matched the micropattern on the photomask. The gelatin-immobilized regions enhanced cell adhesion. It was also confirmed that the gelatin incorporating furfuryl and Rose Bengal have no significant toxicity. The photo-crosslinkable gelatin was employed as a direct pulp capping material in the dental field. Considering these results, this system could be useful as a new type of visible light-induced crosslinkable biosealant.
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Affiliation(s)
- Tae Il Son
- RIKEN Advanced Science Institute, Wako-shi, Saitama, Japan
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Kim KI, Lee JW, Ito Y, Kang JH, Song KS, Jang EC, Son TI. Preparation of photo-reactive azidophenyl chitosan derivative for immobilization of growth factors. J Appl Polym Sci 2010. [DOI: 10.1002/app.32179] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Novak MT, Bryers JD, Reichert WM. Biomimetic strategies based on viruses and bacteria for the development of immune evasive biomaterials. Biomaterials 2009; 30:1989-2005. [PMID: 19185345 PMCID: PMC2673477 DOI: 10.1016/j.biomaterials.2008.11.025] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2008] [Accepted: 11/26/2008] [Indexed: 12/30/2022]
Abstract
The field of biomaterials has begun to focus upon materials strategies for modulating the immune response. While certain approaches appear promising, they are currently limited to isolated facets of inflammation process. It is well documented that both bacteria and viruses have highly developed methods for evading the immune system, providing inspiration for a more biomimetic approach to materials design. This review presents the immune evasive tactics employed by viruses and bacteria, and offers suggestions for future directions that apply these principles to design of immune evasive biomaterials.
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Affiliation(s)
- Matthew T. Novak
- Department of Biomedical Engineering, Duke University, 136 Hudson Hall, Box 90281, Durham, NC, 27708
| | - James D. Bryers
- Department of Bioengineering, University of Washington, PO Box 355061, 1705 NE Pacific Street, Seattle, WA, 98195
| | - William M. Reichert
- Department of Biomedical Engineering, Duke University, 136 Hudson Hall, Box 90281, Durham, NC, 27708
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Hatanaka Y, Tomohiro T, Tachi N, Azuma Y. Hydrophilic Diazirine Polymer for One-Step Photo-Fabrication of Proteins on Polypropylene Surface. HETEROCYCLES 2009. [DOI: 10.3987/com-08-s(d)60] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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28
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Leclerc C, Brose C, Nouzé C, Leonard F, Majlessi L, Becker S, von Briesen H, Lo-Man R. Immobilized cytokines as biomaterials for manufacturing immune cell based vaccines. J Biomed Mater Res A 2008; 86:1033-40. [PMID: 18067172 DOI: 10.1002/jbm.a.31751] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Manufacturing of bioactive cell culture substrates represents a major challenge for the development of cell therapy for tissue repair and immune treatment of cancers, infectious diseases, or immunodeficiencies. In this context, we evaluated the capacity of several differentiation factors, including Granulocyte Macrophage Colony Stimulating Factor (GM-CSF) and Macrophage Colony Stimulating Factor (M-CSF), to drive differentiation of primary cell cultures, once immobilized on surfaces. We show that covalently immobilized signal factors fully retain their biological properties and efficiently promote differentiation of mouse and/or human precursor cells leading to the production of dendritic cells and macrophages. For GM-CSF, we also show that the efficiency of receptor signaling is comparable using either soluble or tethered molecules. Such artificial bioactive interfaces are suitable for the development and automated production of cell-based vaccines and therapies.
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Affiliation(s)
- Claude Leclerc
- Institut Pasteur, Unité de Régulation Immunitaire et Vaccinologie, F-75015 Paris, France
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29
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ITO Y. Creation of Functional Surfaces by Nano Interface Technology. KOBUNSHI RONBUNSHU 2008. [DOI: 10.1295/koron.65.6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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30
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Ito Y. Covalently immobilized biosignal molecule materials for tissue engineering. SOFT MATTER 2007; 4:46-56. [PMID: 32907083 DOI: 10.1039/b708359a] [Citation(s) in RCA: 153] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Immobilization of biosignal molecules including growth factors and cytokines is important for developing biologically active materials which can contribute to tissue engineering as a component. The immobilization has more meanings than only immobilization of the enzyme in a bioreactor or ligand-receptor interactions, because the immobilized biosignal molecules work on cells which have very complex structures and functions. This review discusses recent progress in immobilization of biosignal molecules, including the mechanisms and design concepts.
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Affiliation(s)
- Yoshihiro Ito
- Nano Medical Engineering Laboratory, RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, JAPAN
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31
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Ito Y, Hasuda H, Sakuragi M, Tsuzuki S. Surface modification of plastic, glass and titanium by photoimmobilization of polyethylene glycol for antibiofouling. Acta Biomater 2007; 3:1024-32. [PMID: 17644500 DOI: 10.1016/j.actbio.2007.05.010] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2006] [Revised: 05/19/2007] [Accepted: 05/21/2007] [Indexed: 10/23/2022]
Abstract
Photoreactive poly(ethylene glycol) (PEG) was prepared and the polymer was photoimmobilized on organic, inorganic and metal surfaces to reduce their interaction with proteins and cells. The photoreactive PEG was synthesized by co-polymerization of methacrylate-PEG and acryloyl 4-azidobenzene. Surface modification was carried in the presence and the absence of a micropatterned photomask. It was then straightforward to confirm the immobilization using the micropatterning. Using the micropatterning method, immobilization of the photoreactive PEG on plastic (Thermanox), glass and titanium was confirmed by time-of-flight secondary ion mass spectroscopy and atomic force microscopy observations. The contact angle on an unpatterned surface was measured. Although the original surfaces have different contact angles, the contact angle on PEG-immobilized surfaces was the same on all surfaces. This result demonstrated that the surface was completely covered with PEG by the photoimmobilization. To assess non-specific protein adsorption on the micropatterned surface, horseradish peroxidase (HRP)-conjugated proteins were adsorbed. Reduced protein adsorption was confirmed by vanishingly small staining of HRP substrates on the immobilized regions. COS-7 cells were cultured on the micropatterned surface. The cells did not adhere to the PEG-coated regions. In conclusion, photoreactive PEG was immobilized on various surfaces and tended to reduce interactions with proteins and cells.
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Affiliation(s)
- Yoshihiro Ito
- Kanagawa Academy of Science and Technology, KSP East 309, 3-2-1 Sakado, Takatsu-ku, Kawasaki 213-0012, Japan.
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Cetinkaya G, Türkoğlu H, Arat S, Odaman H, Onur MA, Gümüşderelioğlu M, Tümer A. LIF-immobilized nonwoven polyester fabrics for cultivation of murine embryonic stem cells. J Biomed Mater Res A 2007; 81:911-9. [PMID: 17243152 DOI: 10.1002/jbm.a.31107] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Embryonic stem (ES) cells have a great interest for tissue engineering because of their pluripotent nature and proliferative capacity. The objective of this study is to constitute a synthetic microenvironment to support the in vitro propagation of murine ES cells in an undifferentiated state. That is why we used a three-dimensional matrix, nonwoven polyester fabric (NWPF), which was formed from poly(ethylene terephthalate) (PET) fibers. NWPF discs were partially hydrolyzed, and then the carboxyl groups were coupled with leukemia inhibitory factor (LIF) in the presence of water-soluble carbodiimide. The effectiveness of immobilization process was checked with ATR-FTIR spectroscopy, fluorimetry, and cell culture studies. ES cell colony morphology, alkaline phosphatase (AP) activity, stage-specific embryonic antigen-1 (SSEA-1) immunoreactivity, and SEM analysis following a 72 - 96-h culture period upon hydrolyzed and LIF-immobilized surfaces were assessed to determine the pluripotent status of ES cells. Results revealed that LIF was active in immobilized form; undifferentiated colonies had not only a significant AP and SSEA-1 immunoreactivity, but also a higher undifferentiated colony ratio on LIF-immobilized surfaces than that of hydrolyzed surfaces. The immobilized LIF protein might be a good model to provide a feeder-free system, but the physical properties of the scaffold is more convenient for differentiation studies.
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Affiliation(s)
- Gaye Cetinkaya
- Department of Biology, Hacettepe University, Beytepe, Ankara, Turkey
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Heydari M, Hasuda H, Sakuragi M, Yoshida Y, Suzuki K, Ito Y. Modification of the titan surface with photoreactive gelatin to regulate cell attachment. J Biomed Mater Res A 2007; 83:906-914. [PMID: 17567853 DOI: 10.1002/jbm.a.31368] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Titan (TiO2) was modified with photoreactive gelatin in order to regulate the attachment of cells. Photoreactive gelatin, which was synthesized by the coupling reaction of gelatin with N-(4-azidobenzoyloxy) succinimide, was immobilized onto the n-octadecyltrimethoxysilane (ODS)-TiO2 or TiO2 surface by ultraviolet irradiation both in the absence and presence of a photo mask. In the absence of a photo mask, the modified titan surface was analyzed by measuring water contact angles and X-ray photoelectron spectroscopy (XPS). The result showed that ODS hydrophobilized the titan surface, and that the immobilization of gelatin affected the surface's hydrophilicity. XPS shows that titan was covered with organic material, including ODS and gelatin. With the photo mask in place, micropatterning of the gelatin was performed. This pattern was confirmed by optical microscopy and time-of-flight secondary ion-mass spectroscopy (TOF-SIMS). Monkey COS-7 epithelial cells were cultured on the unpattern- and pattern-immobilized plate. A significantly higher degree of cell attachment was found on the photoreactive gelatin-immobilized regions than on those that were not immobilized. It was concluded that the cellular pattern on titan was regulated by immobilized photoreactive gelatin.
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Affiliation(s)
- Mojgan Heydari
- Regenerative Medical Bioreactor Project, Kanagawa Academy of Science and Technology, KSP East 309, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa 213-0012, Japan
| | - Hirokazu Hasuda
- Regenerative Medical Bioreactor Project, Kanagawa Academy of Science and Technology, KSP East 309, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa 213-0012, Japan
| | - Makoto Sakuragi
- Regenerative Medical Bioreactor Project, Kanagawa Academy of Science and Technology, KSP East 309, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa 213-0012, Japan
| | - Yasuhiro Yoshida
- Department of Biomaterials, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences 2-5-1 Shikata-cho, Okayama 700-8525, Japan
| | - Kazuomi Suzuki
- Department of Biomaterials, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences 2-5-1 Shikata-cho, Okayama 700-8525, Japan
| | - Yoshihiro Ito
- Regenerative Medical Bioreactor Project, Kanagawa Academy of Science and Technology, KSP East 309, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa 213-0012, Japan
- Nano Medical Engineering Laboratory, RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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Kim DH, Smith JT, Chilkoti A, Reichert WM. The effect of covalently immobilized rhIL-1ra-ELP fusion protein on the inflammatory profile of LPS-stimulated human monocytes. Biomaterials 2007; 28:3369-77. [PMID: 17482260 PMCID: PMC2680615 DOI: 10.1016/j.biomaterials.2007.04.010] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2007] [Accepted: 04/02/2007] [Indexed: 12/19/2022]
Abstract
The objective of this research was to investigate whether immobilized anti-inflammatory cytokines will signal changes in the inflammatory profile of cultured monocytes. A fusion protein of recombinant human IL-1 receptor antagonist and elastin-like peptide (IL-1ra-ELP) was expressed in Escherichia coli. THP-1 human monocytes were cultured on either carboxyl-terminated self-assembled monolayers (SAMs), or SAMs with either covalently immobilized or soluble IL-1ra-ELP. LPS-stimulated monocytes exposed to either soluble or immobilized IL-1ra-ELP were prevented from cell differentiation, showed attenuated expression of pro-inflammatory cytokines, and had increased production of anti-inflammatory and pro-wound healing cytokines. These results suggest that immobilized anti-inflammatory cytokines have the potential to be immunomodulatory biomaterials.
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Affiliation(s)
- Dong-Hwan Kim
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
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35
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Ito Y, Hasauda H, Kitajima T, Kiyono T. Ex vivo expansion of human cord blood hematopoietic progenitor cells using glutaraldehyde-fixed human bone marrow stromal cells. J Biosci Bioeng 2007; 102:467-9. [PMID: 17189177 DOI: 10.1263/jbb.102.467] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2006] [Accepted: 08/08/2006] [Indexed: 12/20/2022]
Abstract
Human stromal cells were immortalized and fixed with glutaraldehyde to support an ex vivo expansion of human cord blood hematopoietic progenitor cells. In addition, this enabled glutaraldehyde-fixed stromal cells to be stored at 4 degrees C. Although freeze-dried glutaraldehyde-fixed stromal cells did not increase the number of the progenitor cells, the percent decrease in the number of CD34(+) cells in the presence of freeze-dried glutaraldehyde-fixed stromal cells was less than that in the absence of the stromal cells. Thus, glutaraldehyde-fixed stromal cells can serve as a stabilizing device for hematopoietic cell expansion.
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Affiliation(s)
- Yoshihiro Ito
- Regenerative Medical Bioreactor Project, Kanagawa Academy of Science and Technology, KSP East 309, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa 213-0012, Japan.
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36
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Konno T, Kawazoe N, Chen G, Ito Y. Culture of mouse embryonic stem cells on photoimmobilized polymers. J Biosci Bioeng 2006; 102:304-10. [PMID: 17116576 DOI: 10.1263/jbb.102.304] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2006] [Accepted: 07/03/2006] [Indexed: 11/17/2022]
Abstract
Mouse embryonic stem (ES) cells were cultured on four types of polymer with different surface properties. The polymers were poly(acrylic acid), polyallylamine, gelatin, and poly(2-methacryloyloxyethyl phosphorylcholine-co-methacrylic acid) (PMAc50), and were coupled with azidophenyl groups and photoimmobilized on conventional polystyrene cell-culture dishes. Mouse ES cells were cultured on the immobilized polymer surfaces, and cell morphology, cell growth, staining for alkaline phosphatase, activation of the transcription factor stat3, and expression of the octamer-binding protein 3/4 (Oct3/4) transcription factor and the zinc finger-containing transcription factor (GATA4) were observed. Morphology and growth rate were significantly affected by the polymer surface properties. The ES cells attached to gelatin or polyallylamine surfaces; however, colonies formed on the former but not the latter. In addition, significant enhancement of growth was observed on the gelatin surface. In contrast, ES cells aggregated to form an embryoid body on the photoimmobilized poly(acrylic acid) surface and the PMAc50 surface, although cell growth was reduced. Significant enhancement of aggregation of ES cells on the PMAc50 surface was observed in morphology and gene expression analyses.
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Affiliation(s)
- Tomohiro Konno
- Regenerative Medical Bioreactor Project, Kanagawa Academy of Science and Technology, KSP East 309, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa 213-0012, Japan
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37
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Ogiwara K, Nagaoka M, Cho CS, Akaike T. Effect of photo-immobilization of epidermal growth factor on the cellular behaviors. Biochem Biophys Res Commun 2006; 345:255-9. [PMID: 16678132 DOI: 10.1016/j.bbrc.2006.04.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2006] [Accepted: 04/03/2006] [Indexed: 10/24/2022]
Abstract
We constructed photo-reactive epidermal growth factor (EGF) bearing p-azido phenylalanine at the C-terminal (HEGFP) by genetic engineering to investigate the possibility of immobilized EGF as a novel artificial extracellular matrix (ECM). The constructed recombinant protein was immobilized to glass surface by ultraviolet irradiation. A431 cells adhered both to HEGFP-immobilized and collagen-coated surfaces. Interaction between immobilized HEGFP and EGF receptors in the A431 cells was independent of Mg(2+) although integrin-mediated cell adhesion to natural ECMs is dependent on Mg(2+). Phosphorylation of EGF receptors in A431 cells was induced by immobilized HEGFP as same as soluble EGF. DNA uptake of hepatocytes decreased by immobilized HEGFP whereas it increased by soluble EGF. Liver-specific functions of hepatocytes were maintained for 3 days by immobilized HEGFP whereas they were not maintained by soluble EGF, indicating that immobilized HEGFP follows different signal transduction pathway from soluble EGF.
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Affiliation(s)
- Kazutaka Ogiwara
- Department of Biomolecular Engineering, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama 226-8501, Japan
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Ito Y, Hasuda H, Terai H, Kitajima T. Culture of human umbilical vein endothelial cells on immobilized vascular endothelial growth factor. J Biomed Mater Res A 2005; 74:659-65. [PMID: 16035066 DOI: 10.1002/jbm.a.30360] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Vascular endothelial growth factor (VEGF) was immobilized on substrata in photoreactive gelatin to control the adhesion and growth of vascular endothelial cells. The gelatin and VEGF were mixed in water and cast on a polystyrene dish or a silane-coated glass plate. The surface was then photoirradiated in the presence or absence of a photomask and washed. Toughness of the immobilized material was confirmed by ethanol treatment. Human umbilical vein endothelial cells (HUVECs) grew on the immobilized VEGF but not on a nontreated surface. Growth of HUVEC increased significantly with an increase in the amount of immobilized VEGF, and the effects were inhibited by treatment with anti-VEGF antibody. Thus, immobilized VEGF specifically interacted with HUVECs to permit growth in culture. Micropatterning of HUVEC cultures was also achieved using micropattern-immobilized VEGF. This patterning technique may be useful for the formation of blood vessel networks in vitro.
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Affiliation(s)
- Yoshihiro Ito
- Kanagawa Academy of Science and Technology, KSP East 309, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa, 213-0012, Japan.
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Hasuda H, Kwon OH, Kang IK, Ito Y. Synthesis of photoreactive pullulan for surface modification. Biomaterials 2005; 26:2401-6. [PMID: 15585243 DOI: 10.1016/j.biomaterials.2004.07.065] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2004] [Accepted: 07/27/2004] [Indexed: 11/25/2022]
Abstract
Photoreactive pullulan was prepared, the polymer was photoimmobilized on polymeric or organic surfaces, and its interactions with a protein and a cell type were investigated. The photoreactive pullulan was synthesized by a coupling reaction with 4-azidobenzonic acid. Surface modification was carried out in the presence or absence of a micropatterned photomask containing 100 microm transparent stripes with 150 microm gaps, making it easy to confirm the immobilization. By the micropatterning method, immobilization of the photoreactive pullulan on polystyrene, polyethylene, and silane-coupled glass was confirmed. Contact angles were measured on the unpatterned surfaces. Although the original surfaces have different contact angles, the contact angle on Az-pullulan-immobilized surface was the same on all surfaces. This result demonstrated that photoimmobilization completely covered the surface with Az-pullulan. Protein adsorption was investigated using fluorescently labeled albumin applied to the micropatterned surface: fluorescence microscopy demonstrated that adsorption was reduced on the pullulan-immobilized regions. Culture of RAW264 cells, derived from mouse leukemic monocytes, on the micropatterned surface for 22 h showed that cells did not adhere to the immobilized pullulan regions. In conclusion, photoreactive pullulan was covalently immobilized on various surfaces and tended to reduce interactions with proteins and cells.
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Affiliation(s)
- Hirokazu Hasuda
- Regenerative Medical Bioreactor Project, Kanagwa Academy of Science and Technology, KSP East 309, 3-2-1 Sakado, Takatsu-ku, Kawasaki, 213-0012, Japan
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Abstract
Deoxyribozyme (DNAzyme) carrying peroxidase activity was immobilized on two types of particles and the enzymatic activity was measured. The DNA recognizing porphyrin were prepared according to Travascio et al. ([1998] Chem Biol 5:505-517) and the interactions with hemin were investigated by ultraviolet absorbance and circular dichroism spectroscopies. The DNA interacted with hemin and significant conformational change was induced by the interaction. Therefore, the end of this DNA was modified with a thiol group and it was immobilized on thiol-containing polysaccharide beads or on gold particles. The DNA immobilized on the gold particle showed activity catalyzing the peroxidation reaction. No significant reduction of activity was observed even after immobilization. The immobilized DNAzyme could be repeatedly utilized without significant loss of activity. In addition, heat treatment did not reduce the activity, although a protein enzyme, horseradish peroxidase, lost its activity after the heat treatment. The repertoire of DNAzyme is still currently limited. However, in the future the utilization of DNAzyme in the field of biotechnology will be important with the increase of discoveries of new functional DNAzymes.
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Affiliation(s)
- Yoshihiro Ito
- Kanagawa Academy of Science and Technology, KSP East 309, 3-2-1 Sakado, Takatsu-ku, Kawasaki 213-0012, Japan
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Makino H, Hasuda H, Ito Y. Immobilization of leukemia inhibitory factor (LIF) to culture murine embryonic stem cells. J Biosci Bioeng 2004; 98:374-9. [PMID: 16233722 DOI: 10.1016/s1389-1723(04)00298-1] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2004] [Accepted: 08/30/2004] [Indexed: 11/25/2022]
Abstract
Murine embryonic stem (ES) cells were cultured on a material containing immobilized leukemia inhibitory factor (LIF). To immobilize LIF, we synthesized photoreactive gelatin mixed with LIF and cast the mixture on a polystyrene plate, which was then dried. LIF was immobilized by photoirradiation in the presence or absence of a photo mask. The plate was washed until LIF was no longer released. Murine ES cells were cultured on the immobilized LIF. Activation of STAT3 was maintained on the immobilized LIF for 6 d even after removing soluble LIF. Oct-3/4 was also expressed in the cells cultured on the immobilized LIF. As a result, the mouse ES cells were cultured without differentiating on the immobilized LIF for 6 d. It was possible to culture murine ES cells without adding soluble LIF at each medium change. We conclude that our material containing immobilized LIF might be useful in the culture of murine ES cells.
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Affiliation(s)
- Hiroshi Makino
- Kanagawa Academy of Science and Technology, KSP East 309, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa 213-0012, Japan
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