76
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Kobayashi Y, Zheng Y, Takashima Y, Yamaguchi H, Harada A. Physical and Adhesion Properties of Supramolecular Hydrogels Cross-linked by Movable Cross-linking Molecule and Host-guest Interactions. CHEM LETT 2018. [DOI: 10.1246/cl.180646] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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77
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Takashima Y, Shojima Y, Sekine T, Osaki M, Kobayashi Y, Yamaguchi H, Sekito T, Hatano K, Nakajima K, Harada A. Adhesion of Dissimilar Materials through Host-Guest Interactions and Its Re-adhesion Properties. CHEM LETT 2018. [DOI: 10.1246/cl.180528] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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78
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Takashima Y, Otani K, Kobayashi Y, Aramoto H, Nakahata M, Yamaguchi H, Harada A. Mechanical Properties of Supramolecular Polymeric Materials Formed by Cyclodextrins as Host Molecules and Cationic Alkyl Guest Molecules on the Polymer Side Chain. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b01410] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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79
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Kobayashi Y, Nakamitsu Y, Zheng Y, Takashima Y, Yamaguchi H, Harada A. Control of the threading ratio of cyclic molecules in polyrotaxanes consisting of poly(ethylene glycol) and α-cyclodextrins. Chem Commun (Camb) 2018; 54:7066-7069. [PMID: 29876543 DOI: 10.1039/c8cc01776j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We demonstrated a feasible method for providing polyrotaxanes (PRxs) with a controlled threading ratio of cyclic molecules and chain length of linear polymers by extending the linear polymers in the pseudo-PRx. This method gave PRxs with a lower threading ratio and a higher mobility of cyclic molecules compared to usual methods used previously with a high threading ratio. In addition, our PRx improved the thermal stability of the linear polymers in PRx despite the low threading ratio.
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80
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Takashima Y, Hayashi Y, Osaki M, Kaneko F, Yamaguchi H, Harada A. A Photoresponsive Polymeric Actuator Topologically Cross-Linked by Movable Units Based on a [2]Rotaxane. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00939] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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81
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Zheng Y, Kobayashi Y, Sekine T, Takashima Y, Hashidzume A, Yamaguchi H, Harada A. Visible chiral discrimination via macroscopic selective assembly. Commun Chem 2018. [DOI: 10.1038/s42004-017-0003-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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82
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Nomimura S, Osaki M, Takashima Y, Yamaguchi H, Harada A. Formation of Inclusion Complexes of Poly(hexafluoropropyl ether)s with Cyclodextrins. CHEM LETT 2018. [DOI: 10.1246/cl.171112] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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83
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Shimizu S, Takashima Y, Hotta M, Ito E, Moriuchi R. Inflammatory disseminated superficial porokeratosis successfully controlled with a combination of topical diclofenac gel and systemic etretinate. J Eur Acad Dermatol Venereol 2017; 32:e201-e202. [PMID: 29194784 DOI: 10.1111/jdv.14727] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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84
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Yakushiji Y, Wilson D, Ambler G, Charidimou A, Hara H, Imaizumi T, Kohara K, Kwon H, Launer L, Mok V, Romero J, Srikanth V, Takashima Y, Tsushima Y, Wolf P, Yamaguchi S, Werring D. Differences in the distribution of cerebral microbleeds in multiple eastern and western populations (dicom): Global individual participant data meta-analysis. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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85
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Hörning M, Nakahata M, Linke P, Yamamoto A, Veschgini M, Kaufmann S, Takashima Y, Harada A, Tanaka M. Dynamic Mechano-Regulation of Myoblast Cells on Supramolecular Hydrogels Cross-Linked by Reversible Host-Guest Interactions. Sci Rep 2017; 7:7660. [PMID: 28794475 PMCID: PMC5550483 DOI: 10.1038/s41598-017-07934-x] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Accepted: 07/05/2017] [Indexed: 01/09/2023] Open
Abstract
A new class of supramolecular hydrogels, cross-linked by host-guest interactions between β-cyclodextrin (βCD) and adamantane, were designed for the dynamic regulation of cell-substrate interactions. The initial substrate elasticity can be optimized by selecting the molar fraction of host- and guest monomers for the target cells. Moreover, owing to the reversible nature of host-guest interactions, the magnitude of softening and stiffening of the substrate can be modulated by varying the concentrations of free, competing host molecules (βCD) in solutions. By changing the substrate elasticity at a desired time point, it is possible to switch the micromechanical environments of cells. We demonstrated that the Young's modulus of our "host-guest gels", 4-11 kPa, lies in an optimal range not only for static (ex situ) but also for dynamic (in situ) regulation of cell morphology and cytoskeletal ordering of myoblasts. Compared to other stimulus-responsive materials that can either change the elasticity only in one direction or rely on less biocompatible stimuli such as UV light and temperature change, our supramolecular hydrogel enables to reversibly apply mechanical cues to various cell types in vitro without interfering cell viability.
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86
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Koyanagi K, Takashima Y, Yamaguchi H, Harada A. Movable Cross-Linked Polymeric Materials from Bulk Polymerization of Reactive Polyrotaxane Cross-Linker with Acrylate Monomers. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00797] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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87
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Takashima Y, Yonekura K, Koyanagi K, Iwaso K, Nakahata M, Yamaguchi H, Harada A. Multifunctional Stimuli-Responsive Supramolecular Materials with Stretching, Coloring, and Self-Healing Properties Functionalized via Host–Guest Interactions. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00875] [Citation(s) in RCA: 83] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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88
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Takashima Y, Harada A. Stimuli-responsive polymeric materials functioning via host–guest interactions. J INCL PHENOM MACRO 2017. [DOI: 10.1007/s10847-017-0714-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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89
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Takashima Y, Sawa Y, Iwaso K, Nakahata M, Yamaguchi H, Harada A. Supramolecular Materials Cross-Linked by Host–Guest Inclusion Complexes: The Effect of Side Chain Molecules on Mechanical Properties. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00266] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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90
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Katoh M, Fujimoto M, Kawaguchi H, Tsuchiya K, Ohmi K, Kaneyasu T, Taira Y, Hosaka M, Mochihashi A, Takashima Y. Angular Momentum of Twisted Radiation from an Electron in Spiral Motion. PHYSICAL REVIEW LETTERS 2017; 118:094801. [PMID: 28306317 DOI: 10.1103/physrevlett.118.094801] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Indexed: 06/06/2023]
Abstract
We theoretically demonstrate for the first time that a single free electron in circular or spiral motion emits twisted photons carrying well-defined orbital angular momentum along the axis of the electron circulation, in adding to spin angular momentum. We show that, when the electron velocity is relativistic, the radiation field contains harmonic components and the photons of lth harmonic carry lℏ total angular momentum for each. This work indicates that twisted photons are naturally emitted by free electrons and are more ubiquitous in laboratories and in nature than ever thought.
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91
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Nakahata M, Takashima Y, Harada A. Supramolecular Polymeric Materials Containing Cyclodextrins. Chem Pharm Bull (Tokyo) 2017; 65:330-335. [DOI: 10.1248/cpb.c16-00778] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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92
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Koyanagi K, Takashima Y, Nakamura T, Yamaguchi H, Harada A. Radical polymerization by a supramolecular catalyst: cyclodextrin with a RAFT reagent. Beilstein J Org Chem 2016; 12:2495-2502. [PMID: 28144318 PMCID: PMC5238571 DOI: 10.3762/bjoc.12.244] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Accepted: 11/08/2016] [Indexed: 11/23/2022] Open
Abstract
Supramolecular catalysts have received a great deal of attention because they improve the selectivity and efficiency of reactions. Catalysts with host molecules exhibit specific reaction properties and recognize substrates via host-guest interactions. Here, we examined radical polymerization reactions with a chain transfer agent (CTA) that has α-cyclodextrin (α-CD) as a host molecule (α-CD-CTA). Prior to the polymerization of N,N-dimethylacrylamide (DMA), we investigated the complex formation of α-CD with DMA. Single X-ray analysis demonstrated that α-CD includes DMA inside its cavity. When DMA was polymerized in the presence of α-CD-CTA using 2,2'-azobis[2-(2-imidazolin-2-yl)propane dihydrochloride (VA-044) as an initiator in an aqueous solution, poly(DMA) was obtained in good yield and with narrow molecular weight distribution. In contrast, the polymerization of DMA without α-CD-CTA produced more widely distributed polymers. In the presence of 1,6-hexanediol (C6 diol) which works as a competitive molecule by being included in the α-CD cavity, the reaction yield was lower than that without C6 diol.
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93
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Sekine T, Takashima Y, Yamaguchi H, Harada A. Direct Adhesion of Dissimilar Materials Using Sonogashira Cross-coupling Reaction. CHEM LETT 2016. [DOI: 10.1246/cl.160637] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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94
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Naka S, Nomura R, Takashima Y, Okawa R, Ooshima T, Nakano K. A specific Streptococcus mutans strain aggravates non-alcoholic fatty liver disease. Oral Dis 2016; 20:700-6. [PMID: 25360469 DOI: 10.1111/odi.12191] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
OBJECTIVE Streptococcus mutans, a major dental caries pathogen, has shown to be associated with the aggravation of cerebral hemorrhage and inflammatory bowel diseases. In this study, we evaluated the effects ofS. mutans on the development of non-alcoholic steatohepatitis (NASH) in a mouse model. MATERIALS AND METHODS Streptococcus mutans oral strain MT8148 (serotype c) and a blood isolate TW871 (k) were used. C57BL/6J mice (6 weeks old)were fed a high-fat diet for 4 weeks; the test strains or phosphate-buffered saline was then intravenously administered. Mice were euthanized after 8 or 12 weeks. Whole body, extirpated liver, and visceral fat weights were determined, and histopathological evaluations of the liver specimens were performed. RESULTS Mice infected with TW871 showed significantly greater body and liver weights than those administered MT8148 or phosphate-buffered saline. Histopathological analyses revealed prominent infiltration of inflammatory cells and adipocellular deposition in livers extirpated 8 weeks after an infection with TW871; fibrosis was also observed in livers extirpated after 12 weeks. CONCLUSION These results suggest that a specific strain of S. mutans could induce NASH.
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Kobayashi Y, Takashima Y, Hashidzume A, Yamaguchi H, Harada A. Manual control of catalytic reactions: Reactions by an apoenzyme gel and a cofactor gel. Sci Rep 2015; 5:16254. [PMID: 26537172 PMCID: PMC4633677 DOI: 10.1038/srep16254] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Accepted: 10/12/2015] [Indexed: 11/11/2022] Open
Abstract
Enzymes play a vital role in catalysing almost all chemical reactions that occur in biological systems. Some enzymes must form complexes with non-protein molecules called cofactors to express catalytic activities. Although the control of catalytic reactions via apoenzyme–cofactor complexes has attracted significant attention, the reports have been limited to the microscale. Here, we report a system to express catalytic activity by adhesion of an apoenzyme gel and a cofactor gel. The apoenzyme and cofactor gels act as catalysts when they form a gel assembly, but they lose catalytic ability upon manual dissociation. We successfully construct a system with switchable catalytic activity via adhesion and separation of the apoenzyme gel with the cofactor gel. We expect that this methodology can be applied to regulate the functional activities of enzymes that bear cofactors in their active sites, such as the oxygen transport of haemoglobin or myoglobin and the electron transport of cytochromes.
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Nakahata M, Takashima Y, Harada A. Highly Flexible, Tough, and Self-Healing Supramolecular Polymeric Materials Using Host-Guest Interaction. Macromol Rapid Commun 2015; 37:86-92. [DOI: 10.1002/marc.201500473] [Citation(s) in RCA: 178] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 09/01/2015] [Indexed: 11/08/2022]
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97
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Takashima Y, Fujita K, Ardin A, Nagayama K, Nomura R, Nakano K, Matsumoto-Nakano M. Characterization of the dextran-binding domain in the glucan-binding protein C of Streptococcus mutans. J Appl Microbiol 2015; 119:1148-57. [DOI: 10.1111/jam.12895] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 05/22/2015] [Accepted: 06/09/2015] [Indexed: 11/30/2022]
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98
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Takashima Y, Shimada T, Yokozawa T. Corrigendum to: Clinical benefit of measuring both haemoglobin and transferrin concentrations in faeces: demonstration during a large-scale colorectal cancer screening trial in Japan. Diagnosis (Berl) 2015. [DOI: 10.1515/dx-2015-0011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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99
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Miyamae K, Nakahata M, Takashima Y, Harada A. Self-Healing, Expansion-Contraction, and Shape-Memory Properties of a Preorganized Supramolecular Hydrogel through Host-Guest Interactions. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201502957] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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100
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Miyamae K, Nakahata M, Takashima Y, Harada A. Self-Healing, Expansion-Contraction, and Shape-Memory Properties of a Preorganized Supramolecular Hydrogel through Host-Guest Interactions. Angew Chem Int Ed Engl 2015; 54:8984-7. [DOI: 10.1002/anie.201502957] [Citation(s) in RCA: 396] [Impact Index Per Article: 44.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2015] [Indexed: 11/12/2022]
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