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Kato N, Nagayoshi K, Takayama Y, Nasuno E. Structuring of multiple parallel pectin gel filaments by applied shear. Int J Biol Macromol 2019; 128:304-313. [PMID: 30684582 DOI: 10.1016/j.ijbiomac.2019.01.109] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2018] [Revised: 01/06/2019] [Accepted: 01/22/2019] [Indexed: 10/27/2022]
Abstract
The bundled structure of micron-sized pectin gel filaments was formed by quick shear-induced gelation of the filamentous domains of pectin-polyethylene glycol (PEG) assemblies. Highly concentrated pectin with PEG in a separated pectin-rich phase under aqueous two-phase separation in the pectin/PEG/NaCl system enabled the formation of the pectin-PEG assembly, which was elongated in the flow direction, resulting in the generation of filamentous domains using a microfluidic device. The pectin gel filaments were formed by crosslinking with Ca2+ in the presence of shear-responsive PEG assemblies formed in the PEG-rich phase, because the filamentous PEG assemblies prevented fusion of the pectin filaments to form the seamless cylindrical gel. The shear-dependent elongation applied to the pectin-PEG assembly under the aqueous two-phase separation condition enabled the formation of the biomimetic bundled filamentous structure using bio-safe PEG as a sacrificial polymer, without the requirement of a multi-hole nozzle. Potential applications for gel filaments possessing a bundled structure are matrices in the biomedical field, such as a biodegradable scaffold for cell engineering.
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Affiliation(s)
- Norihiro Kato
- Department of Material and Environmental Chemistry, Graduate School of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan.
| | - Keisyu Nagayoshi
- Department of Material and Environmental Chemistry, Graduate School of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan
| | - Yuriko Takayama
- Department of Material and Environmental Chemistry, Graduate School of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan
| | - Eri Nasuno
- Department of Material and Environmental Chemistry, Graduate School of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan
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Tachizawa S, Takahashi H, Kim YJ, Odawara A, Pauty J, Ikeuchi Y, Suzuki I, Kikuchi A, Matsunaga YT. Bundle Gel Fibers with a Tunable Microenvironment for in Vitro Neuron Cell Guiding. ACS APPLIED MATERIALS & INTERFACES 2017; 9:43250-43257. [PMID: 29086563 DOI: 10.1021/acsami.7b14585] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
As scaffolds for neuron cell guiding in vitro, gel fibers with a bundle structure, comprising multiple microfibrils, were fabricated using a microfluidic device system by casting a phase-separating polymer blend solution comprising hydroxypropyl cellulose (HPC) and sodium alginate (Na-Alg). The topology and stiffness of the obtained bundle gel fibers depended on their microstructure derived by the polymer blend ratio of HPC and Na-Alg. High concentrations of Na-Alg led to the formation of small microfibrils in a one-bundle gel fiber and stiff characteristics. These bundle gel fibers permitted for the elongation of the neuron cells along their axon orientation with the long axis of fibers. In addition, human-induced pluripotent-stem-cell-derived dopaminergic neuron progenitor cells were differentiated into neuronal cells on the bundle gels. The bundle gel fibers demonstrated an enormous potential as cell culture scaffold materials with an optimal microenvironment for guiding neuron cells.
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Affiliation(s)
- Sayaka Tachizawa
- Institute of Industrial Science, The University of Tokyo , 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
- Department of Materials Science and Technology, Graduate School of Industrial Science and Technology, Tokyo University of Science , 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
| | - Haruko Takahashi
- Institute of Industrial Science, The University of Tokyo , 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Young-Jin Kim
- Institute of Industrial Science, The University of Tokyo , 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Aoi Odawara
- Department of Electronics, Graduate School of Engineering, Tohoku Institute of Technology , 35-1 Yagiyama, Kasumicho, Taihaku-ku, Sendai, Miyagi 982-8577, Japan
- Research Institute of Electrical Communication, Tohoku University , 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan
| | - Joris Pauty
- Institute of Industrial Science, The University of Tokyo , 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
- LIMMS/CNRS-IIS UMI 2820; SMMiL-E project, Institute of Industrial Science, The University of Tokyo , 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Yoshiho Ikeuchi
- Institute of Industrial Science, The University of Tokyo , 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Ikuro Suzuki
- Department of Electronics, Graduate School of Engineering, Tohoku Institute of Technology , 35-1 Yagiyama, Kasumicho, Taihaku-ku, Sendai, Miyagi 982-8577, Japan
| | - Akihiko Kikuchi
- Department of Materials Science and Technology, Graduate School of Industrial Science and Technology, Tokyo University of Science , 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
| | - Yukiko T Matsunaga
- Institute of Industrial Science, The University of Tokyo , 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
- LIMMS/CNRS-IIS UMI 2820; SMMiL-E project, Institute of Industrial Science, The University of Tokyo , 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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Ita K. Dermal/transdermal delivery of small interfering RNA and antisense oligonucleotides- advances and hurdles. Biomed Pharmacother 2017; 87:311-320. [PMID: 28064104 DOI: 10.1016/j.biopha.2016.12.118] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2016] [Revised: 12/26/2016] [Accepted: 12/27/2016] [Indexed: 10/20/2022] Open
Abstract
A diverse array of nucleic acids has been studied by several researchers for the management of several diseases. Among these compounds, small interfering RNA and antisense oligonucleotides have attracted considerable attention. Antisense oligonucleotides are synthetic single stranded strings of nucleic acids that bind to RNA and thereby alter or reduce expression of the target RNA while siRNAs, on the other hand, are double-stranded RNA molecules which can hybridize with a specific mRNA sequence and block the translation of numerous genes. One of the main obstacles in the dermal or transdermal delivery of these compounds is their low skin permeability. In this review, various techniques used to enhance the delivery of these molecules into or across the skin are described and in some cases, the correlation between enhanced dermal/transdermal delivery and therapeutic efficacy is highlighted.
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Affiliation(s)
- Kevin Ita
- College of Pharmacy, Touro University, Mare Island-Vallejo, CA 94592, USA.
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Kim YJ, Matsunaga YT. Thermo-responsive polymers and their application as smart biomaterials. J Mater Chem B 2017; 5:4307-4321. [DOI: 10.1039/c7tb00157f] [Citation(s) in RCA: 324] [Impact Index Per Article: 46.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
This review summarises smart thermo-responsive polymeric materials with reversible and ‘on–off’ remotely switchable properties for a wide range of biomedical and biomaterials applications.
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Affiliation(s)
- Young-Jin Kim
- Center for International Research on Integrative Biomedical Systems (CIBiS)
- The University of Tokyo
- Tokyo 153-8505
- Japan
- Bioengineering Laboratory
| | - Yukiko T. Matsunaga
- Center for International Research on Integrative Biomedical Systems (CIBiS)
- The University of Tokyo
- Tokyo 153-8505
- Japan
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