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Zhao Y, Cao Z, Zhang J, Tian J, Cai H. Thermo-responsible PNIPAM-grafted polystyrene microspheres for mesenchymal stem cells culture and detachment. Biomed Mater 2024; 19:065023. [PMID: 39312938 DOI: 10.1088/1748-605x/ad7e6e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2024] [Accepted: 09/23/2024] [Indexed: 09/25/2024]
Abstract
The preparation of cells is a critical step in cell therapy. To ensure the effectiveness of cells used for clinical treatments, it is essential to harvest adherent cells from the culture media in a way that preserves their high viability and full functionality. In this study, we developed temperature-responsive poly(N-isopropylacrylamide) (PNIPAM)-grafted polystyrene (PS) microspheres using reversible addition-fragmentation chain transfer polymerization. These microspheres allow for the non-destructive harvesting of cultured cells through temperature changes. The composition and physicochemical properties of the PNIPAM-grafted PS microspheres were confirmed using infrared spectroscopy, elemental analysis, dynamic light scattering, and thermogravimetric analysis.In vitroexperiments demonstrated that these microspheres exhibit excellent biocompatibility, supporting the adhesion and proliferation of various cells. Moreover, the microspheres showed good temperature responsiveness in thermosensitive detachment experiments with GFP-HepG2cells and umbilical cord mesenchymal stem cells (UC-MSCs). Additionally, through orthogonal experiments, we identified a cell detachment aid mixture that significantly improved the dispersibility of cells detached from the microspheres, enhancing the efficiency of thermosensitive cell detachment by approximately 40%. The harvested UC-MSCs retained their capacity for re-proliferation and trilineage differentiation. Consequently, the temperature-responsive microspheres developed in this study, combined with the cell detachment aid mixtures, hold great potential for large-scale culture and harvesting of therapeutic cells in clinical applications.
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Affiliation(s)
- Yuanyuan Zhao
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People's Republic of China
| | - Zida Cao
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People's Republic of China
| | - Jingwei Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People's Republic of China
| | - Jia Tian
- Shanghai Key Laboratory of Functional Materials Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People's Republic of China
| | - Haibo Cai
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People's Republic of China
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2
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Dhawan V, Martin PN, Hu X, Cui XT. Investigation of a chondroitin sulfate-based bioactive coating for neural interface applications. J Mater Chem B 2024; 12:5535-5550. [PMID: 38747002 PMCID: PMC11152038 DOI: 10.1039/d4tb00501e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Accepted: 05/09/2024] [Indexed: 06/06/2024]
Abstract
Invasive neural implants allow for high-resolution bidirectional communication with the nervous tissue and have demonstrated the ability to record neural activity, stimulate neurons, and sense neurochemical species with high spatial selectivity and resolution. However, upon implantation, they are exposed to a foreign body response which can disrupt the seamless integration of the device with the native tissue and lead to deterioration in device functionality for chronic implantation. Modifying the device surface by incorporating bioactive coatings has been a promising approach to camouflage the device and improve integration while maintaining device performance. In this work, we explored the novel application of a chondroitin sulfate (CS) based hydrophilic coating, with anti-fouling and neurite-growth promoting properties for neural recording electrodes. CS-coated samples exhibited significantly reduced protein-fouling in vitro which was maintained for up to 4-weeks. Cell culture studies revealed a significant increase in neurite attachment and outgrowth and a significant decrease in microglia attachment and activation for the CS group as compared to the control. After 1-week of in vivo implantation in the mouse cortex, the coated probes demonstrated significantly lower biofouling as compared to uncoated controls. Like the in vitro results, increased neuronal population (neuronal nuclei and neurofilament) and decreased microglial activation were observed. To assess the coating's effect on the recording performance of silicon microelectrodes, we implanted coated and uncoated electrodes in the mouse striatum for 1 week and performed impedance and recording measurements. We observed significantly lower impedance in the coated group, likely due to the increased wettability of the coated surface. The peak-to-peak amplitude and the noise floor levels were both lower in the CS group compared to the controls, which led to a comparable signal-to-noise ratio between the two groups. The overall single unit yield (% channels recording a single unit) was 74% for the CS and 67% for the control group on day 1. Taken together, this study demonstrates the effectiveness of the polysaccharide-based coating in reducing biofouling and improving biocompatibility for neural electrode devices.
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Affiliation(s)
- Vaishnavi Dhawan
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA.
- Center for Neural Basis of Cognition, Pittsburgh, PA, USA
| | - Paige Nicole Martin
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA.
| | - Xiaoming Hu
- Department of Neurology, University of Pittsburgh, PA, USA
| | - Xinyan Tracy Cui
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA.
- Center for Neural Basis of Cognition, Pittsburgh, PA, USA
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3
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Imashiro C, Mei J, Friend J, Takemura K. Quantifying cell adhesion through forces generated by acoustic streaming. ULTRASONICS SONOCHEMISTRY 2022; 90:106204. [PMID: 36257212 PMCID: PMC9583098 DOI: 10.1016/j.ultsonch.2022.106204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 09/01/2022] [Accepted: 10/12/2022] [Indexed: 06/16/2023]
Abstract
The strength of cell adhesion is important in understanding the cell's health and in culturing them. Quantitative measurement of cell adhesion strength is a significant challenge in bioengineering research. For this, the present study describes a system that can measure cell adhesion strength using acoustic streaming induced by Lamb waves. Cells are cultured on an ultrasound transducer using a range of preculture and incubation times with phosphate-buffered saline (PBS) just before the measurement. Acoustic streaming is then induced using several Lamb wave intensities, exposing the cells to shear flows and eventually detaching them. By relying upon a median detachment rate of 50 %, the corresponding detachment force, or force of cell adhesion, was determined to be on the order of several nN, consistent with previous reports. The stronger the induced shear flow, the more cells were detached. Further, we employed a preculture time of 8 to 24 h and a PBS incubation time of 0 to 60 min, producing cell adhesion forces that varied from 1.2 to 13 nN. Hence, the developed system can quantify cell adhesion strength over a wide range, possibly offering a fundamental tool for cell-based bioengineering.
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Affiliation(s)
- Chikahiro Imashiro
- Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666, Japan; Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan.
| | - Jiyang Mei
- Medically Advanced Devices Laboratory, Center for Medical Devices, Department of Mechanical and Aerospace Engineering, Jacobs School of Engineering and Department of Surgery, School of Medicine, University of California, San Diego, CA 92093, USA
| | - James Friend
- Medically Advanced Devices Laboratory, Center for Medical Devices, Department of Mechanical and Aerospace Engineering, Jacobs School of Engineering and Department of Surgery, School of Medicine, University of California, San Diego, CA 92093, USA
| | - Kenjiro Takemura
- Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
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Hong HJ, Cho JM, Yoon YJ, Choi D, Lee S, Lee H, Ahn S, Koh WG, Lim JY. Thermoresponsive fiber-based microwells capable of formation and retrieval of salivary gland stem cell spheroids for the regeneration of irradiation-damaged salivary glands. J Tissue Eng 2022; 13:20417314221085645. [PMID: 35422983 PMCID: PMC9003645 DOI: 10.1177/20417314221085645] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Accepted: 02/19/2022] [Indexed: 11/16/2022] Open
Abstract
Three-dimensional spheroid culture enhances cell-to-cell interactions among stem cells and promotes the expression of stem cell properties; however, subsequent retrieval and delivery of these cells remain a challenge. We fabricated a thermoresponsive fiber-based microwell scaffold by combining electrospinning and hydrogel micropatterning. The resultant scaffold appeared to facilitate the formation of cellular spheroids of uniform size and enabled the expression of more stem cell-secreting growth factor genes (EGF, IGF-1, FGF1, FGF2, and HGF), pluripotent stem cell-related genes (SOX2 and NANOG), and adult epithelial stem cell-related genes (LGR4, LGR5, and LGR6) than salivary gland stem cells in a monolayer culture (SGSCmonolayer). The spheroids could be retrieved efficiently by decreasing temperature. SGSC-derived spheroid (SGSCspheroid) cells were then implanted into the submandibular glands of mice at 2 weeks after fractionated X-ray irradiation at a dose of 7.5 Gy/day. At 16 weeks post-irradiation, restoration of salivary function was detected only in SGSCspheroid-implanted mice. The production of submandibular acini specific mucin increased in SGSCspheroid-implanted mice, compared with PBS control. More MIST1+ mature acinar cells were preserved in the SGSCspheroid-implanted group than in the PBS control group. Intriguingly, SGSCspheroid-implanted mice exhibited greater amelioration of tissue damage and preservation of KRT7+ terminally differentiated luminal ductal cells than SGSCmonolayer-implanted mice. The SGSCspheroid-implanted mice also showed less DNA damage and apoptotic cell death than the SGSCmonolayer-implanted mice at 2 weeks post-implantation. Additionally, a significant increase in Ki67+AQP5+ proliferative acinar cells was noted only in SGSCspheroid-implanted mice. Our results suggest that a thermoresponsive fiber-based scaffold could be of use to facilitate the production of function-enhanced SGSCspheroid cells and their subsequent retrieval and delivery to damaged salivary glands to alleviate radiation-induced apoptotic cell death and promote salivary gland regeneration.
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Affiliation(s)
- Hye Jin Hong
- Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, Republic of Korea
| | - Jae-Min Cho
- Department of Otorhinolaryngology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Yeo-Jun Yoon
- Department of Otorhinolaryngology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - DoJin Choi
- Department of Otorhinolaryngology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Soohyun Lee
- Department of Otorhinolaryngology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Hwajung Lee
- Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, Republic of Korea
| | - Sujeong Ahn
- Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, Republic of Korea
| | - Won-Gun Koh
- Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, Republic of Korea
| | - Jae-Yol Lim
- Department of Otorhinolaryngology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
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5
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Fukuma Y, Inui T, Imashiro C, Kurashina Y, Takemura K. Homogenization of initial cell distribution by secondary flow of medium improves cell culture efficiency. PLoS One 2020; 15:e0235827. [PMID: 32667933 PMCID: PMC7983807 DOI: 10.1371/journal.pone.0235827] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Accepted: 06/23/2020] [Indexed: 11/30/2022] Open
Abstract
Homogenization of the initial cell distribution is essential for effective cell
development. However, there are few previous reports on efficient cell seeding
methods, even though the initial cell distribution has a large effect on cell
proliferation. Dense cell regions have an inverse impact on cell development,
known as contact inhibition. In this study, we developed a method to homogenize
the cell seeding density using secondary flow, or Ekman transportation, induced
by orbital movement of the culture dish. We developed an orbital shaker device
that can stir the medium in a 35-mm culture dish by shaking the dish along a
circular orbit with 2 mm of eccentricity. The distribution of cells in the
culture dish can be controlled by the rotational speed of the orbital shaker,
enabling dispersion of the initial cell distribution. The experimental results
indicated that the cell density became most homogeneous at 61 rpm. We further
evaluated the cell proliferation after homogenization of the initial cell
density at 61 rpm. The results revealed 36% higher proliferation for the stirred
samples compared with the non-stirred control samples. The present findings
indicate that homogenization of the initial cell density by Ekman transportation
contributes to the achievement of higher cell proliferation.
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Affiliation(s)
- Yuki Fukuma
- School of Science for Open and Environmental Systems, Graduate School of
Science and Technology, Keio University, Yokohama, Kanagawa,
Japan
| | - Takumi Inui
- School of Science for Open and Environmental Systems, Graduate School of
Science and Technology, Keio University, Yokohama, Kanagawa,
Japan
| | - Chikahiro Imashiro
- Department of Mechanical Engineering, Faculty of Science and Technology,
Keio University, Yokohama, Kanagawa, Japan
- Institute of Advanced Biomedical Engineering and Science, Tokyo Women’s
Medical University, Tokyo, Japan
| | - Yuta Kurashina
- Department of Materials Science and Engineering, School of Materials and
Chemical Technology, Tokyo institute of Technology, Yokohama, Kanagawa,
Japan
| | - Kenjiro Takemura
- Department of Mechanical Engineering, Faculty of Science and Technology,
Keio University, Yokohama, Kanagawa, Japan
- * E-mail:
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6
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Koo MA, Lee MH, Park JC. Recent Advances in ROS-Responsive Cell Sheet Techniques for Tissue Engineering. Int J Mol Sci 2019; 20:ijms20225656. [PMID: 31726692 PMCID: PMC6888384 DOI: 10.3390/ijms20225656] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Revised: 11/06/2019] [Accepted: 11/08/2019] [Indexed: 12/12/2022] Open
Abstract
Cell sheet engineering has evolved rapidly in recent years as a new approach for cell-based therapy. Cell sheet harvest technology is important for producing viable, transplantable cell sheets and applying them to tissue engineering. To date, most cell sheet studies use thermo-responsive systems to detach cell sheets. However, other approaches have been reported. This review provides the progress in cell sheet detachment techniques, particularly reactive oxygen species (ROS)-responsive strategies. Therefore, we present a comprehensive introduction to ROS, their application in regenerative medicine, and considerations on how to use ROS in cell detachment. The review also discusses current limitations and challenges for clarifying the mechanism of the ROS-responsive cell sheet detachment.
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Affiliation(s)
- Min-Ah Koo
- Department of Medical Engineering, Yonsei University College of Medicine, Seoul 03722, Korea
- Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul 03722, Korea
| | - Mi Hee Lee
- Department of Medical Engineering, Yonsei University College of Medicine, Seoul 03722, Korea
| | - Jong-Chul Park
- Department of Medical Engineering, Yonsei University College of Medicine, Seoul 03722, Korea
- Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul 03722, Korea
- Correspondence: ; Tel.: +82-2-2228-1917
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7
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Aladdad AM, Amer MH, Sidney L, Hopkinson A, White LJ, Alexander C, Rose FR. A thermoresponsive three-dimensional fibrous cell culture platform for enzyme-free expansion of mammalian cells. Acta Biomater 2019; 95:427-438. [PMID: 30669005 DOI: 10.1016/j.actbio.2019.01.037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 01/03/2019] [Accepted: 01/17/2019] [Indexed: 12/13/2022]
Abstract
A three-dimensional thermoresponsive fibrous scaffold system for the subsequent extended culture and enzyme-free passaging of a range of mammalian cell types is presented. Poly(PEGMA188) was incorporated with poly(ethylene terephthalate) (PET) via blend-electrospinning to render the fibre thermoresponsive. Using primary human corneal stromal stem cells as an therapeutically relevant exemplar, cell adhesion, viability, proliferation and phenotype on this fibrous culture system over numerous thermal enzyme-free passages is described. We also illustrate the versatility of this system with respect to fabricating thermoresponsive fibres from biodegradable polymers and for the culture of diverse mammalian cell types including mesenchymal stem cells, colon adenocarcinoma cells and NIH-3T3 fibroblasts. This thermoresponsive scaffold system combines the advantages of providing a physiologically relevant environment to maintain a desirable cell phenotype, allowing routine enzyme-free passaging and expansion of cultured cells, whilst offering mechanical support for cell growth. The system described in this study presents a versatile platform for biomedical applications and more specifically for the expansion of mammalian cells destined for the clinic. STATEMENT OF SIGNIFICANCE: The lack of three-dimensional (3D) cell culture environments significantly impacts mammalian cell morphology, proliferation and phenotype in vitro. A versatile, 3D fibrous scaffold system for the extended culture and passaging of a range of clinically-relevant cell types is presented herein. This methodology can be used to fabricate thermoresponsive fibres from polymer blends of any polymer amenable to electrospinning and with a thermoresponsive component. A variety of mammalian cells cultured on the thermoresponsive system were detached from the surface solely by lowering the temperature whilst retaining high viability, a desirable cell phenotype, and supported long-term cell proliferation over numerous thermal enzyme-free passages. This is a significant advance for in vitro expansion of diverse cell types destined for the clinic.
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8
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Sponchioni M, Capasso Palmiero U, Moscatelli D. Thermo-responsive polymers: Applications of smart materials in drug delivery and tissue engineering. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 102:589-605. [PMID: 31147031 DOI: 10.1016/j.msec.2019.04.069] [Citation(s) in RCA: 173] [Impact Index Per Article: 34.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 04/02/2019] [Accepted: 04/22/2019] [Indexed: 01/01/2023]
Abstract
Synthetic polymers are attracting great attention in the last decades for their use in the biomedical field as nanovectors for controlled drug delivery, hydrogels and scaffolds enabling cell growth. Among them, polymers able to respond to environmental stimuli have been recently under growing consideration to impart a "smart" behavior to the final product, which is highly desirable to provide it with a specific dynamic and an advanced function. In particular, thermo-responsive polymers, materials able to undergo a discontinuous phase transition or morphological change in response to a temperature variation, are among the most studied. The development of the so-called controlled radical polymerization techniques has paved the way to a high degree of engineering for the polymer architecture and properties, which in turn brought to a plethora of sophisticated behaviors for these polymers by simply switching the external temperature. These can be exploited in many different fields, from separation to advanced optics and biosensors. The aim of this review is to critically discuss the latest advances in the development of thermo-responsive materials for biomedical applications, including a highly controlled drug delivery, mediation of cell growth and bioseparation. The focus is on the structural and design aspects that are required to exploit such materials for cutting-edge applications in the biomedical field.
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Affiliation(s)
- Mattia Sponchioni
- Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, Via Mancinelli 7, 20131 Milano, Italy; Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland.
| | - Umberto Capasso Palmiero
- Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - Davide Moscatelli
- Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, Via Mancinelli 7, 20131 Milano, Italy
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Tauchi H, Imashiro C, Kuribara T, Fujii G, Kurashina Y, Totani K, Takemura K. Effective and Intact Cell Detachment from a Clinically Ubiquitous Culture Flask by Combining Ultrasonic Wave Exposure and Diluted Trypsin. BIOTECHNOL BIOPROC E 2019. [DOI: 10.1007/s12257-018-0491-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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10
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Gola A, Sacharczuk M, Musiał W. Synthesis of AMPSA Polymeric Derivatives Monitored by Electrical Conductivity and Evaluation of Thermosensitive Properties of Resulting Microspheres. Molecules 2019; 24:molecules24061164. [PMID: 30909617 PMCID: PMC6470677 DOI: 10.3390/molecules24061164] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 03/19/2019] [Accepted: 03/21/2019] [Indexed: 12/11/2022] Open
Abstract
Four stimuli-responsive polymers of N-isopropylacrylamide (NIPA) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPSA) and crosslinked derivatives by N,N′-methylene bisacrylamide (MBA) were synthesized: PNA, PAMPSA, PNAM, PAMPSAM. The effect of the cross-linker and methyl sulphonic acid (-CH3-SO3H) group on particle size, aggregation and volume phase transition temperature (VPTT) was investigated. Polymeric particles were synthesized via the surfactant free precipitation polymerization (SFPP) at 70 °C in the presence of cationic initiator 2,2′-azobis[2-methylpropionamidine] dihydrochloride (AMP) system. Chemical composition and morphology of investigated samples were evaluated using ATR-FTIR spectroscopy, 1H-NMR spectrometry and SEM-EDS techniques. The hydrodynamic diameters (HD), zeta potential (ZP), and polydispersity index (PDI) in aqueous dispersions were assessed by dynamic light scattering (DLS) between 18–42 °C. HD values at 18 °C for PNA, PAMPSA, PNAM, PAMPSAM polymers were approx. 32, 730, 715, 665 nm, and ZP values were −1.36, −0.01, 8.90, −0.09 mV, respectively. The VPTT range was observed between 29 and 41 °C. PDI’s for PNA and PNAM were low and varied between 0.276 and 0.460, and between 0.119 and 0.056, respectively. PAMPSA and PAMPSAM were characterized by higher PDI in the range 0.728–0.959 and 0.658–0.836, respectively. The results confirmed the thermal sensitivity of the synthesized polymers and indicated a significant polydispersity and aggregation tendency of the resulting molecules. The conductivity results were applied for the interpretation of the polymerization process.
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Affiliation(s)
- Agnieszka Gola
- Department of Physical Chemistry, Pharmaceutical Faculty, Wroclaw Medical University Borowska 211, 50-556 Wroclaw, Poland.
| | - Magdalena Sacharczuk
- Department of Physical Chemistry, Pharmaceutical Faculty, Wroclaw Medical University Borowska 211, 50-556 Wroclaw, Poland.
| | - Witold Musiał
- Department of Physical Chemistry, Pharmaceutical Faculty, Wroclaw Medical University Borowska 211, 50-556 Wroclaw, Poland.
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11
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Alternating electric field application induced non-contact and enzyme-free cell detachment. Cytotechnology 2019; 71:583-597. [PMID: 30783819 DOI: 10.1007/s10616-019-00307-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Accepted: 02/11/2019] [Indexed: 12/11/2022] Open
Abstract
Low intensity (< 2 Vpp/cm (peak to peak voltage/cm)), high frequency (10-30 MHz), and 10 min alternating electric fields (sine wave with no DC component) induce non-contact and enzyme-free cell detachment of anchorage-dependent cells directly from commercially available cell culture flasks and stack plates. 0.25 Vpp/cm, 20 MHz alternating electric field for 10 min at room temperature (RT) induced maximum detachment and separated 99.5 ± 0.1% (mean ± SEM, n = 6) of CHO-K1 and 99.8 ± 0.2% of BALB/3T3 cells from the culture flasks. Both vertical and lateral alternating electric field applications for 10 min at RT detach the CHO-K1 cells from 25 cm2 culture flasks. The alternating electric field application induced cell detachment is almost noncytotoxic, and over 90% of the detached cells remained alive. The alternating electric field applied CHO-K1 cells for 90 min showed little or no lag phase and immediately enter exponential phase in cell growth. Combination of the 20 MHz alternating electric field and enzymatic treatment for 4 min at 37 °C showed synergetic effect and quickly detached human induced pluripotent stem cells from a laminin-coated culture flask compared with the only enzymatic treatment. These results indicate that the rapid cell detachment with both the electric field application and the enzymatic treatment could be applied to subcultures of cells that are susceptible to prolonged enzymatic digestion damage for mass culture of sustainable clinical use.
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12
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Kurashina Y, Hirano M, Imashiro C, Totani K, Komotori J, Takemura K. Enzyme-free cell detachment mediated by resonance vibration with temperature modulation. Biotechnol Bioeng 2017. [PMID: 28627736 DOI: 10.1002/bit.26361] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Cell detachment is an essential process in adherent cell culture. However, trypsinization, which is the most popular detachment technique used in culture, damages cellular membranes. Reducing cellular membrane damage during detachment should improve the quality of cell culture. In this article, we propose an enzyme-free cell detachment method based on resonance vibration with temperature modulation. We developed a culture device that can excite a resonance vibration and control temperature. We then evaluated the cell detachment ratio and the growth response, observed the morphology, and analyzed the cellular protein of the collected cells-mouse myoblast cell line (C2C12). With the temperature of 10°C and the maximum vibration amplitude of 2 μm, 77.9% of cells in number were successfully detached compared with traditional trypsinization. The 72-h proliferation ratio of the reseeded cells was similar to that with trypsinization, whereas the proliferation ratio of proposed method was 12.6% greater than that of trypsinization after freezing and thawing. Moreover, the cells can be collected relatively intact and both intracellular and cell surface proteins in the proposed method were less damaged than in trypsinization. These results show that this method has definite advantages over trypsinization, which indicates that it could be applied to subcultures of cells that are more susceptible to trypsin damage for mass culture of sustainable clinical use. Biotechnol. Bioeng. 2017;114: 2279-2288. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Yuta Kurashina
- School of Science for Open and Environmental Systems, Graduate School of Science and Technology, Keio University, Yokohama, Japan
| | - Makoto Hirano
- Department of Materials and Life Science, Faculty of Science and Technology, Seikei University, Tokyo, Japan.,Department of Pharmacy, Yasuda Women's University, Hiroshima, Japan
| | - Chikahiro Imashiro
- School of Science for Open and Environmental Systems, Graduate School of Science and Technology, Keio University, Yokohama, Japan
| | - Kiichiro Totani
- Department of Materials and Life Science, Faculty of Science and Technology, Seikei University, Tokyo, Japan
| | - Jun Komotori
- Department of Mechanical Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Kenjiro Takemura
- Department of Mechanical Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
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13
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Nakao M, Kurashina Y, Imashiro C, Takemura K. A Method for Collecting Single Cell Suspensions Using an Ultrasonic Pump. IEEE Trans Biomed Eng 2017; 65:224-231. [PMID: 28463184 DOI: 10.1109/tbme.2017.2699291] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The presence of cell aggregates in cell suspensions may reduce cell culture efficiency because they can induce apoptosis and inhibit proliferation. To avoid this problem, this study proposes a novel method for collecting single cell suspensions from culture chambers for subculture using an ultrasonic pump driven by the squeeze film effect. First, we developed a cell culture device consisting of a cell culture substrate with a piezoelectric ceramic disk glued to the back, so that we can elicit resonance vibration of the substrate. A glass pipe is then placed vertically against the cell culture substrate with a slight gap (corresponding to cell diameter) between the pipe and the substrate. By exciting an out-of-plane resonance vibration of the cell culture substrate, we can collect a cell suspension from the cell culture chamber. Since the gap distance between the glass pipe and the cell culture substrate corresponds to cell diameter, the collected cell suspension only contains single cells. We evaluated the capability of the developed cell suspension pumping system and the proliferation of the collected cells with C2C12 myoblast cells. The ratio of single cells in the cell suspension was improved by up to 9.6% compared with that of suspensions collected by the control method (traditional pipetting). Moreover, after cultivating the collected cells for 72 hr, the cells collected by our method proliferated 13.6% more than those collected by the control method. These results suggest that the proposed method has great potential for improving the cultivation efficiency of adhesive cell culture.
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Microglia derived from the axotomized adult rat facial nucleus uptake glutamate and metabolize it to glutamine in vitro. Neurochem Int 2016; 102:1-12. [PMID: 27816478 DOI: 10.1016/j.neuint.2016.10.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 09/12/2016] [Accepted: 10/31/2016] [Indexed: 11/22/2022]
Abstract
Microglia in the axotomized adult rat facial nucleus (axoFN) have been shown to highly express a glutamate transporter (GLT-1). The microglia appear to serve as glutamate (Glu) scavengers in the axoFN. However, there is no evidence that the microglia actually have the ability to uptake Glu and convert it to Gln. In this study, we investigated whether axoFN-derived microglia (axoFN-microglia) can uptake Glu and metabolize it to Gln. Microglia obtained by explant culture of axoFN on poly(N-isopropylacrylamide)-grafted dishes were non-invasively sub-cultured onto dishes or wells. Immunoblotting and Glu-uptake experiments revealed that the axoFN-microglia uptake 14C-Glu mainly by GLT-1 activity. Immunoblotting and immunocytochemical methods clarified that axoFN-microglia express the Gln synthetase (GS) protein in the same manner as newborn rat brain-derived primary microglia (NRB-microglia). Biochemical analysis demonstrated that the specific activity of GS of axoFN-microglia is similar to that of NRB-microglia, suggesting that these microglia play equivalent roles in the metabolic conversion of Glu to Gln. Nuclear magnetic resonance analysis clarified that NRB-microglia metabolize [13C]Glu to [13C]Gln depending on the incubation time, inferring the similar potential of axoFN-microglia. Taken together, these results demonstrate that axoFN-microglia express functional GLT-1 and GS proteins, and are strongly suggested to serve as Glu scavengers in vivo.
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Kurashina Y, Takemura K, Friend J, Miyata S, Komotori J. Efficient Subculture Process for Adherent Cells by Selective Collection Using Cultivation Substrate Vibration. IEEE Trans Biomed Eng 2016; 64:580-587. [PMID: 27187942 DOI: 10.1109/tbme.2016.2567647] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Cell detachment and reseeding are typical operations in cell culturing, often using trypsin exposure and pipetting, even though this process is known to damage the cells. Reducing the number of detachment and reseeding steps might consequently improve the overall quality of the culture, but to date this has not been an option. This study proposes the use of resonant vibration in the cell cultivation substrate to selectively release adherent calf chondrocyte cells: Some were released from the substrate and collected while others were left upon the substrate to grow to confluence as a subculture-without requiring reseeding. An out-of-plane vibration mode with a single nodal circle was used in the custom culture substrate. At a maximum vibration amplitude of 0.6 µm, 84.9% of the cells adhering to the substrate were released after 3 min exposure, leaving a sufficient number of cells for passage and long-term cell culture, with the greatest cell concentration along the nodal circle where the vibration was relatively quiescent. The 72-h proliferation of the unreleased cells was 20% greater in number than cells handled using the traditional method of trypsin-EDTA (0.050%) release, pipette collection, and reseeding. Due to the vibration, it was possible to reduce the trypsin-EDTA used for selective release to only 0.025%, and in doing so the cell number after 72 h of proliferation was 42% greater in number than the traditional technique.
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Abstract
Organ and tissue loss through disease and injury motivate the development of therapies that can regenerate tissues and decrease reliance on transplantations. Regenerative medicine, an interdisciplinary field that applies engineering and life science principles to promote regeneration, can potentially restore diseased and injured tissues and whole organs. Since the inception of the field several decades ago, a number of regenerative medicine therapies, including those designed for wound healing and orthopedics applications, have received Food and Drug Administration (FDA) approval and are now commercially available. These therapies and other regenerative medicine approaches currently being studied in preclinical and clinical settings will be covered in this review. Specifically, developments in fabricating sophisticated grafts and tissue mimics and technologies for integrating grafts with host vasculature will be discussed. Enhancing the intrinsic regenerative capacity of the host by altering its environment, whether with cell injections or immune modulation, will be addressed, as well as methods for exploiting recently developed cell sources. Finally, we propose directions for current and future regenerative medicine therapies.
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Affiliation(s)
- Angelo S Mao
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138; Wyss Institute for Biologically Inspired Engineering at Harvard University, Cambridge, MA 02138
| | - David J Mooney
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138; Wyss Institute for Biologically Inspired Engineering at Harvard University, Cambridge, MA 02138
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Kurashina Y, Takemura K, Miyata S, Komotori J, Koyama T. Effective cell collection method using collagenase and ultrasonic vibration. BIOMICROFLUIDICS 2014; 8:054118. [PMID: 25584115 PMCID: PMC4290568 DOI: 10.1063/1.4899054] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Accepted: 10/10/2014] [Indexed: 06/04/2023]
Abstract
This study proposes a novel cell collection method based on collagenase treatment and ultrasonic vibration. The method collects calf chondrocytes from a reusable metal cell culture substrate. To develop our concept, we calculated the natural vibration modes of the cell culture substrate by a finite element method, and conducted eigenvalue and piezoelectric-structural analyses. Selecting the first out-of-plane vibration mode of the substrate, which has a single nodal circle, we designed and fabricated the cell collection device. The excited vibration mode properly realized our intentions. We then evaluated the cell collection ratio and the growth response, and observed the morphology of the collected cells. The collagenase and ultrasonic vibration treatment collected comparable numbers of cells to conventional trypsin and pipetting treatment, but improved the proliferating cell statistics. Morphological observations revealed that the membranes of cells collected by the proposed method remain intact; consequently, the cells are larger and rougher than cells collected by the conventional method. Therefore, we present a promising cell collection method for adhesive cell culturing process.
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Affiliation(s)
- Y Kurashina
- School of Science for Open and Environmental Systems, Graduate School of Science and Technology, Keio University , Yokohama 223-8522, Japan
| | - K Takemura
- Department of Mechanical Engineering, Faculty of Science and Technology, Keio University , Yokohama 223-8522, Japan
| | - S Miyata
- Department of Mechanical Engineering, Faculty of Science and Technology, Keio University , Yokohama 223-8522, Japan
| | - J Komotori
- Department of Mechanical Engineering, Faculty of Science and Technology, Keio University , Yokohama 223-8522, Japan
| | - T Koyama
- Medicalscience Co. Ltd. , Yokohama 231-0033, Japan
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Higuchi A, Ling QD, Kumar SS, Chang Y, Kao TC, Munusamy MA, Alarfaj AA, Hsu ST, Umezawa A. External stimulus-responsive biomaterials designed for the culture and differentiation of ES, iPS, and adult stem cells. Prog Polym Sci 2014. [DOI: 10.1016/j.progpolymsci.2014.05.001] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Ai Y, Nie J, Wu G, Yang D. The DOPA-functionalized bioadhesive with properties of photocrosslinked and thermoresponsive. J Appl Polym Sci 2014. [DOI: 10.1002/app.41102] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Yufei Ai
- State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education; Beijing University of Chemical Technology; Beijing 100029 China
- Beijing Laboratory of Biomedical Materials; Beijing University of Chemical Technology; Beijing 100029 People's Republic of China
| | - Jun Nie
- State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education; Beijing University of Chemical Technology; Beijing 100029 China
- Beijing Laboratory of Biomedical Materials; Beijing University of Chemical Technology; Beijing 100029 People's Republic of China
| | - Gang Wu
- Department of Orthopedics, Beijing Tongren Hospital; Capital Medical University; Beijing China
| | - Dongzhi Yang
- State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education; Beijing University of Chemical Technology; Beijing 100029 China
- Beijing Laboratory of Biomedical Materials; Beijing University of Chemical Technology; Beijing 100029 People's Republic of China
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Chen JK, Chang CJ. Fabrications and Applications of Stimulus-Responsive Polymer Films and Patterns on Surfaces: A Review. MATERIALS (BASEL, SWITZERLAND) 2014; 7:805-875. [PMID: 28788489 PMCID: PMC5453090 DOI: 10.3390/ma7020805] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Revised: 01/10/2014] [Accepted: 01/16/2014] [Indexed: 11/17/2022]
Abstract
In the past two decades, we have witnessed significant progress in developing high performance stimuli-responsive polymeric materials. This review focuses on recent developments in the preparation and application of patterned stimuli-responsive polymers, including thermoresponsive layers, pH/ionic-responsive hydrogels, photo-responsive film, magnetically-responsive composites, electroactive composites, and solvent-responsive composites. Many important new applications for stimuli-responsive polymers lie in the field of nano- and micro-fabrication, where stimuli-responsive polymers are being established as important manipulation tools. Some techniques have been developed to selectively position organic molecules and then to obtain well-defined patterned substrates at the micrometer or submicrometer scale. Methods for patterning of stimuli-responsive hydrogels, including photolithography, electron beam lithography, scanning probe writing, and printing techniques (microcontact printing, ink-jet printing) were surveyed. We also surveyed the applications of nanostructured stimuli-responsive hydrogels, such as biotechnology (biological interfaces and purification of biomacromoles), switchable wettability, sensors (optical sensors, biosensors, chemical sensors), and actuators.
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Affiliation(s)
- Jem-Kun Chen
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, 43, Section 4, Keelung Road, Taipei 106, Taiwan.
| | - Chi-Jung Chang
- Department of Chemical Engineering, Feng Chia University, 100 Wenhwa Road, Seatwen, Taichung 40724, Taiwan.
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Iwata T, Washio K, Yoshida T, Ishikawa I, Ando T, Yamato M, Okano T. Cell sheet engineering and its application for periodontal regeneration. J Tissue Eng Regen Med 2013; 9:343-56. [DOI: 10.1002/term.1785] [Citation(s) in RCA: 111] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2012] [Revised: 05/01/2013] [Accepted: 05/06/2013] [Indexed: 01/01/2023]
Affiliation(s)
- Takanori Iwata
- Institute of Advanced Biomedical Engineering and Science; Tokyo Women's Medical University; Shinjuku-ku Tokyo Japan
- Department of Oral and Maxillofacial Surgery; Tokyo Women's Medical University; Shinjuku-ku Tokyo Japan
| | - Kaoru Washio
- Institute of Advanced Biomedical Engineering and Science; Tokyo Women's Medical University; Shinjuku-ku Tokyo Japan
| | - Toshiyuki Yoshida
- Institute of Advanced Biomedical Engineering and Science; Tokyo Women's Medical University; Shinjuku-ku Tokyo Japan
| | - Isao Ishikawa
- Institute of Advanced Biomedical Engineering and Science; Tokyo Women's Medical University; Shinjuku-ku Tokyo Japan
| | - Tomohiro Ando
- Department of Oral and Maxillofacial Surgery; Tokyo Women's Medical University; Shinjuku-ku Tokyo Japan
| | - Masayuki Yamato
- Institute of Advanced Biomedical Engineering and Science; Tokyo Women's Medical University; Shinjuku-ku Tokyo Japan
| | - Teruo Okano
- Institute of Advanced Biomedical Engineering and Science; Tokyo Women's Medical University; Shinjuku-ku Tokyo Japan
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Abstract
Cell sheet engineering has been progressing rapidly during the past few years and has emerged as a novel approach for cell based therapy. Cell sheet harvest technology enables fabrication of viable, transplantable cell sheets for various tissue engineering applications. Currently, the majority of cell sheet studies use thermo-responsive systems for cell sheet detachment. However, other responsive systems began showing their potentials for cell sheet harvest. This review provides an overview of current techniques in creating cell sheets using different types of responsive systems including thermo-responsive, electro-responsive, photo-responsive, pH-responsive and magnetic systems. Their mechanism, approach, as well as applications for cell detachment have been introduced. Further development of these responsive systems will allow efficient cell sheet harvesting and patterning of cells to reconstruct complex tissue for broad clinical applications.
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Affiliation(s)
- Nikul G Patel
- Department of Biomedical Engineering, The University of Akron, Akron, OH, USA
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Silva AKA, Richard C, Ducouret G, Bessodes M, Scherman D, Merten OW. Xyloglucan-Derivatized Films for the Culture of Adherent Cells and Their Thermocontrolled Detachment: A Promising Alternative to Cells Sensitive to Protease Treatment. Biomacromolecules 2013; 14:512-9. [DOI: 10.1021/bm3017737] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Amanda K. A. Silva
- Unité de
Pharmacologie Chimique et Génétique et d’Imagerie; CNRS, UMR 8151, Paris, F-75270 cedex
France; Inserm, U1022, Paris, F-75270 cedex
France; Faculté des Sciences Pharmaceutiques et
Biologiques, Université Paris Descartes, Sorbonne Paris Cité, Paris, F-75270 cedex France; and ENSCP, Paris, F-75231 cedex France, Chimie Paritech,
France
- Genethon, 1 bis rue de l’Internationale, BP 60, 91002 Evry cedex,
France
| | - Cyrille Richard
- Unité de
Pharmacologie Chimique et Génétique et d’Imagerie; CNRS, UMR 8151, Paris, F-75270 cedex
France; Inserm, U1022, Paris, F-75270 cedex
France; Faculté des Sciences Pharmaceutiques et
Biologiques, Université Paris Descartes, Sorbonne Paris Cité, Paris, F-75270 cedex France; and ENSCP, Paris, F-75231 cedex France, Chimie Paritech,
France
| | - Guylaine Ducouret
- Physico-chimie
des
Polymères et des Milieux Dispersés, UMR
7615, UPMC−CNRS-ESPCI, 10 rue Vauquelin,
75231 Paris cedex 05, France
| | - Michel Bessodes
- Unité de
Pharmacologie Chimique et Génétique et d’Imagerie; CNRS, UMR 8151, Paris, F-75270 cedex
France; Inserm, U1022, Paris, F-75270 cedex
France; Faculté des Sciences Pharmaceutiques et
Biologiques, Université Paris Descartes, Sorbonne Paris Cité, Paris, F-75270 cedex France; and ENSCP, Paris, F-75231 cedex France, Chimie Paritech,
France
| | - Daniel Scherman
- Unité de
Pharmacologie Chimique et Génétique et d’Imagerie; CNRS, UMR 8151, Paris, F-75270 cedex
France; Inserm, U1022, Paris, F-75270 cedex
France; Faculté des Sciences Pharmaceutiques et
Biologiques, Université Paris Descartes, Sorbonne Paris Cité, Paris, F-75270 cedex France; and ENSCP, Paris, F-75231 cedex France, Chimie Paritech,
France
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Abstract
In vitro fabrication of tissues and the regeneration of internal organs are no longer regarded as science fiction but as potential remedies for individuals suffering from chronic degenerative diseases. Tissue engineering has generated much interest from researchers in many fields, including cell and molecular biology, biomedical engineering, transplant medicine, and organic chemistry. Attempts to build tissues or organs in vitro have utilized both scaffold and scaffold-free approaches. Despite considerable progress, fabrication of three-dimensional tissue constructs in vitro remains a challenge. In this chapter, we introduce and discus current concepts of tissue engineering with particular focus on future clinical application.
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Brun-Graeppi AKAS, Richard C, Bessodes M, Scherman D, Merten OW. Cell microcarriers and microcapsules of stimuli-responsive polymers. J Control Release 2011; 149:209-24. [DOI: 10.1016/j.jconrel.2010.09.023] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2010] [Accepted: 09/21/2010] [Indexed: 12/22/2022]
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26
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Don TM, Chou SC, Cheng LP, Tai HY. Cellular compatibility of copolymer hydrogels based on site-selectively-modified chitosan with poly(N-isopropyl acrylamide). J Appl Polym Sci 2010. [DOI: 10.1002/app.32806] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Fukumori K, Akiyama Y, Kumashiro Y, Kobayashi J, Yamato M, Sakai K, Okano T. Characterization of Ultra-Thin Temperature-Responsive Polymer Layer and Its Polymer Thickness Dependency on Cell Attachment/Detachment Properties. Macromol Biosci 2010; 10:1117-29. [DOI: 10.1002/mabi.201000043] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Wei J, He P, Liu A, Chen X, Wang X, Jing X. Surface Modification of Hydroxyapatite Nanoparticles with Thermal-Responsive PNIPAM by ATRP. Macromol Biosci 2009; 9:1237-46. [DOI: 10.1002/mabi.200900256] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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da Silva RM, López-Pérez PM, Elvira C, Mano JF, Román JS, Reis RL. Poly(N-isopropylacrylamide) surface-grafted chitosan membranes as a new substrate for cell sheet engineering and manipulation. Biotechnol Bioeng 2008; 101:1321-31. [DOI: 10.1002/bit.22004] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Leung BK, Biran R, Underwood CJ, Tresco PA. Characterization of microglial attachment and cytokine release on biomaterials of differing surface chemistry. Biomaterials 2008; 29:3289-97. [PMID: 18485471 DOI: 10.1016/j.biomaterials.2008.03.045] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2008] [Accepted: 03/26/2008] [Indexed: 11/16/2022]
Abstract
The clinical usefulness of central nervous system recording electrodes is currently limited by inconsistent long-term performance that is believed to be governed by the brain tissue response to the implant. In this study, we observed persistent macrophage biomarker expression at the biotic-abiotic interface surrounding implanted electrodes over a 12-week indwelling period. Using the cell type-specific marker CD11b to examine the cells attached to electrodes retrieved over the indwelling period, we found that most of the cells were activated microglia, the resident macrophage of brain tissue, indicating that the implanted electrodes behave as a persistent inflammatory stimulus. To determine the potential usefulness of different materials as coatings for implanted electrodes, we examined brain-derived microglial cell attachment and cytokine release on a number of medically relevant materials. Our results suggest that activated microglia attach to many of the materials used as external coatings for electrode manufacture, and likely serve as a source of pro-inflammatory and neurotoxic cytokines that may be responsible for reducing the biocompatibility of such implants. Our results also indicate that low protein-binding coatings may be useful in reducing microglial attachment upon implantation in brain tissue and may provide a means of improving electrode biocompatibility.
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Affiliation(s)
- Braden K Leung
- The Keck Center for Tissue Engineering, Department of Bioengineering, College of Engineering, University of Utah, Salt Lake City, UT 84112, USA
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da Silva RM, Mano JF, Reis RL. Smart thermoresponsive coatings and surfaces for tissue engineering: switching cell-material boundaries. Trends Biotechnol 2007; 25:577-83. [DOI: 10.1016/j.tibtech.2007.08.014] [Citation(s) in RCA: 258] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2007] [Revised: 08/15/2007] [Accepted: 08/28/2007] [Indexed: 11/27/2022]
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Yamato M, Akiyama Y, Kobayashi J, Yang J, Kikuchi A, Okano T. Temperature-responsive cell culture surfaces for regenerative medicine with cell sheet engineering. Prog Polym Sci 2007. [DOI: 10.1016/j.progpolymsci.2007.06.002] [Citation(s) in RCA: 152] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Yang J, Yamato M, Nishida K, Hayashida Y, Shimizu T, Kikuchi A, Tano Y, Okano T. Corneal epithelial stem cell delivery using cell sheet engineering: not lost in transplantation. J Drug Target 2007; 14:471-82. [PMID: 17062394 DOI: 10.1080/10611860600847997] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Cell-based therapies have now generated significant interest as novel drug delivery systems, with various adult cell types used in treating a wide range of diseases. To overcome the limits that restrict treatments for corneal surface dysfunction, corneal epithelial stem cells expanded ex vivo have been applied as an alternative approach. While previous studies used various carrier substrates, we present a novel method using cell sheet engineering with temperature-responsive culture dishes to create carrier-free corneal epithelial stem cell sheets that can be transplanted without sutures. Results from clinical trials reveal successful transplantation with the recovery of lost visual acuity in all cases. Cell sheet engineering, therefore, presents a novel method for the delivery of corneal epithelial stem cells, and can also be applied for other approaches of cellular therapeutics.
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Affiliation(s)
- Joseph Yang
- Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University, Tokyo, Japan
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Kubota A, Nishida K, Yamato M, Yang J, Kikuchi A, Okano T, Tano Y. Transplantable retinal pigment epithelial cell sheets for tissue engineering. Biomaterials 2006; 27:3639-44. [PMID: 16545450 DOI: 10.1016/j.biomaterials.2006.02.018] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2005] [Accepted: 02/14/2006] [Indexed: 11/27/2022]
Abstract
The native retinal pigment epithelium (RPE) exists as a monolayer structure and is critically involved in the maintenance of photoreceptors. Damage or destruction of the RPE due to a variety of diseases therefore often results in loss of vision. With regenerative purposes in mind, we have examined various culture conditions such as the initial cell density and the addition of various supplements in an effort to produce transplantable RPE cell sheets that can be harvested without defects. We demonstrate that the cell density in cultured RPE sheets increased linearly with the number of seeded cells and that RPE sheets were harvested without defects and limited contraction due to cytoskeletal reorganization, when TGF-beta2 was added to the growth medium. Results from histological analysis and the measurement of trans-epithelial resistance also demonstrates that these RPE cell sheets exist as monolayer structure, similar to the native RPE, with intact cell-to-cell junctions. Therefore, these methods provide significant insight into the fabrication of transplantable RPE cell sheets that can be applied to RPE regenerative therapies to restore lost vision.
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Affiliation(s)
- Akira Kubota
- Department of Ophthalmology, Osaka University Medical School, Room E7, 2-2 Yamadaoka, Suita, Osaka 565-0871, JAPAN
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Zhang H, Iwama M, Akaike T, Urry DW, Pattanaik A, Parker TM, Konishi I, Nikaido T. Human Amniotic Cell Sheet Harvest Using a Novel Temperature-Responsive Culture Surface Coated with Protein-Based Polymer. ACTA ACUST UNITED AC 2006; 12:391-401. [PMID: 16548697 DOI: 10.1089/ten.2006.12.391] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Human amniotic epithelial (hAE) and mesenchymal (hAM) cells are believed to have the potential to differentiate into various functional cells, such as neurons, hepatocytes, cardiomyocytes, and pancreatic beta cells. However, cell transplantation has been performed by injection of cell suspensions, and thus it is difficult to control shape, size, location, and functions of differentiated cells. To overcome these problems, we developed a novel temperature-responsive culture surface coated with elastic protein-based polymer. By reducing the temperature using a polyvinylidene difluoride (PVDF) membrane, the primary hAE and hAM cell sheet can detach from the coated surface. The recovered cell sheet can be transferred and can re-adhere and re-proliferate on another surface. This represents the first report of harvesting of primary hAE and hAM cell sheets using the novel temperature- responsive polymer. These findings suggest that this new technique of cell sheet detachment from noncytotoxic, highly biocompatible protein-based polymer-coated surfaces may be useful in tissue engineering, as well as in the investigation of hAE and hAM cell sheets for transplantation.
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Affiliation(s)
- Helin Zhang
- Department of Organ Regeneration, Institute of Organ Transplants, Reconstructive Medicine and Tissue Engineering, Shinshu University Graduate School of Medicine, Matsumoto, Japan
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SHIRAISHI K, OHDAN M, MAEDA K, SUGIYAMA K, SUZUKI K, HOSOYA H. Preparation of Thermo-sensitive Polymer-grafted Poly (ethyleneterephthalate) Films by Ar Plasma Irradiation-post Polymerization Technique and Thermal Stimuli-exfoliation of HeLa Cells on Their Films. KOBUNSHI RONBUNSHU 2006. [DOI: 10.1295/koron.63.613] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Daoud G, Simoneau L, Masse A, Rassart E, Lafond J. Expression of cFABP and PPAR in trophoblast cells: effect of PPAR ligands on linoleic acid uptake and differentiation. Biochim Biophys Acta Mol Cell Biol Lipids 2005; 1687:181-94. [PMID: 15708366 DOI: 10.1016/j.bbalip.2004.11.017] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2004] [Revised: 11/19/2004] [Accepted: 11/23/2004] [Indexed: 11/29/2022]
Abstract
Throughout gestation, fetal growth depends, in part, on placental transfer of maternal essential fatty acid (EFA) and long-chain polyunsaturated fatty acid. All fatty acid (FA) can cross lipid bilayer by simple diffusion, such as those in the syncytiotrophoblasts, the multinucleated, terminally differentiated trophoblast cells. The trophoblasts differentiation process is accompanied by an increase of human chorionic gonadotropin (hCG) secretion and an inhibition of Human Achaete-Scute Homologue-2 expression (Hash-2). Furthermore, a number of FA-binding proteins (FABPs) have been identified in membrane and cytoplasm of mammalian cells, which are thought to facilitate the transfer of FA across membranes and their intracellular channeling. Thus, the aim of this study was to investigate the implication of cFABPs in linoleic acid (LA) uptake by human trophoblast cells according to differentiation. Moreover, since peroxisome proliferator-activated receptor (PPARs) regulate the expression of cFABP and play an important role in trophoblast cells differentiation, the effects of PPARs ligands are verified on cFABP expression and differentiation. Herein, we reported the increase of the expression of liver and heart FABP (L- and H-FABP) upon differentiation of trophoblast cells, an inhibition of PPAR alpha and beta, while PPAR gamma levels remains unchanged. The nonselective peroxisome-proliferating agents, bezafibrate and LA, impaired trophoblast differentiation, and reduced L- and H-FABP expression. Furthermore, cobalt, a chemical agent known to mimic hypoxia, inhibits trophoblast cells differentiation and diminishes H-, L-FABP and PPARs expression. Finally, both treatments show no influence on LA uptake by trophoblast cells. In conclusion, this study showed that there is no correlation between the expression of H- and L-FABP and LA uptake by trophoblast cells and that bezafibrate and LA greatly impaired trophoblast cells differentiation.
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Affiliation(s)
- Georges Daoud
- Laboratoire de Physiologie materno-fonetale, Département des Sciences Biologiques, Université du Québec à Montréal, Succursale Centre-ville, Montréal, Québec, Canada H3C 3P8
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Kikuchi A, Okano T. Nanostructured designs of biomedical materials: applications of cell sheet engineering to functional regenerative tissues and organs. J Control Release 2005; 101:69-84. [PMID: 15588895 DOI: 10.1016/j.jconrel.2004.08.026] [Citation(s) in RCA: 171] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2004] [Accepted: 08/30/2004] [Indexed: 11/28/2022]
Abstract
Biomaterials surface design is critical for control of cell-materials interactions. Materials surface characteristics important to cell-materials interactions are the following: (a) nonfouling surfaces where cells cannot interact; (b) surfaces that interact with cells but do not alter cell morphology or metabolism (passive adhesion processes); and (c) surfaces that strongly interact with cells and cell-surface receptors to alter cell shape after metabolic interactions (active adhesion). In this paper, we briefly discuss the relationship between materials surface characteristics and cells for biomaterials designs in these categories. We have extensively investigated the thermoresponsive polymer, poly(N-isopropylacrylamide) (PIPAAm), as grafted surfaces allowing recovery of confluent cell monolayers as contiguous living cell sheets for tissue engineering applications. Cellular interactions with PIPAAm-grafted surfaces can be regulated vertically using the thickness of the PIPAAm-grafted layers in nanometer-scale levels, as well as laterally (spatially) using nano-patterned PIPAAm chemistry on various other surface chemistries. PIPAAm-grafted surfaces with 15-20-nm thick layers exhibit temperature-dependent cell adhesion/detachment control, while surfaces with PIPAAm layer thicknesses of more than 30 nm do not support cell adhesion. These changes in cell adhesion are explained by the limited mobility of the surface grafted polymer chains as a function of grafting, hydration, and temperature.
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Affiliation(s)
- Akihiko Kikuchi
- Institute of Advanced Biomedical Engineering and Science, Center of Excellence (COE) Program for the 21st Century, Tokyo Women's Medical University, 8-1 Kawadacho, Shinjuku, Tokyo 162-8666, Japan.
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Cheng X, Wang Y, Hanein Y, Böhringer KF, Ratner BD. Novel cell patterning using microheater-controlled thermoresponsive plasma films. J Biomed Mater Res A 2004; 70:159-68. [PMID: 15227660 DOI: 10.1002/jbm.a.30053] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A novel approach is reported for cell patterning based on addressable microheaters and a poly(N-isopropyl acrylamide) (pNIPAM) themoresponsive coating. This thermoresponsive coating is created by a radio frequency NIPAM plasma and is denoted as plasma polymerized NIPAM (ppNIPAM). Films of ppNIPAM with a good retention of monomer side-chain functionality are produced using low-power continuous plasma deposition. Cell adhesion and cell detachment tests indicate that the surface switches between adhesive and nonadhesive behaviors as a function of temperature. The use of a photolithographically fabricated microheater array allows the ppNIPAM transition to occur spatially under the control of individual heaters. This localized change in the surface adhesive behavior is used to direct site-specific cell attachment. Patterned adhesion of two types of cells has been visualized on the array through fluorescent markers. Applications for diagnostic devices, cell-based sensors, tissue engineering, and cell transfection are envisioned.
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Affiliation(s)
- Xuanhong Cheng
- Bioengineering Department, University of Washington Engineered Biomaterials, Seattle, Washington 98195, USA
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Abstract
Myocardial tissue engineering has now emerged as one of the most promising treatments for the patients suffering from severe heart failure. Tissue engineering has currently been based on the technology using three-dimensional (3-D) biodegradable scaffolds as alternatives for extracellular matrix. According to this most popular technique, several types of 3-D myocardial tissues have been successfully engineered by seeding cardiomyocytes into poly(glycolic acid), gelatin, alginate or collagen scaffolds. However, insufficient cell migration into the scaffolds and inflammatory reaction due to scaffold biodegradation remain problems to be solved. In contrast to these technologies, we now propose novel tissue engineering methodology layering cell sheets to construct 3-D functional tissues without any artificial scaffolds. Confluent cells on temperature-responsive culture surfaces can be harvested as a viable contiguous cell sheet only by lowering temperature without any enzymatic digestions. Electrical communications are established between layered cardiomyocyte sheets, resulting in simultaneous beating 3-D myocardial tissues. Layered cardiomyocyte sheets in vivo present long survival, macroscopic pulsation and characteristic structures of native heart tissue. Cell sheet engineering should have enormous potential for fabricating clinically applicable myocardial tissues and should promote tissue engineering research fields.
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Affiliation(s)
- Tatsuya Shimizu
- Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666, Japan
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Serizawa T, Wakita K, Akashi M. Rapid Deswelling of Porous Poly(N-isopropylacrylamide) Hydrogels Prepared by Incorporation of Silica Particles. Macromolecules 2002. [DOI: 10.1021/ma011362+] [Citation(s) in RCA: 187] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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