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Kudo R, Samitsu S, Mori H. Self-healing amino acid-bearing acrylamides/ n-butyl acrylate copolymers via multiple noncovalent bonds. RSC Adv 2024; 14:7850-7857. [PMID: 38449826 PMCID: PMC10915467 DOI: 10.1039/d4ra00800f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Accepted: 02/19/2024] [Indexed: 03/08/2024] Open
Abstract
Four amino acid-bearing acrylamides, N-acryloyl-l-threonine (AThrOH), N-acryloyl-l-glutamic acid (AGluOH), N-acryloyl-l-phenylalanine (APheOH), and N-acryloyl-l, l-diphenylalanine (APhePheOH), were selected for copolymerization with n-butyl acrylate (nBA) to develop amino acid-based self-healable copolymers. A series of copolymers comprising amino acid-bearing acrylamides and nBA with tunable comonomer compositions and molecular weights were synthesized by free radical and reversible addition-fragmentation chain-transfer copolymerization. Self-healing and mechanical properties originated from the noncovalent bonds between the carboxyl, hydroxyl, and amide groups, and π-π stacking interactions among the amino acid residues in the side chains were evaluated. Among these copolymers, P(nBA-co-AGluOH) with suitable comonomer compositions and molecular weights (nBA : AGluOH = 82 : 18, Mn = 18 300, Mw/Mn = 2.58) exhibited good mechanical properties (modulus of toughness = 17.3 MJ m-3) and self-healing under ambient conditions. The multiple noncovalent bonds of P(nBA-co-AGluOH)s were also efficient in improving the optical properties with an enhanced refractive index and good transparency.
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Affiliation(s)
- Ryo Kudo
- Department of Organic Material Science, Graduate School of Organic Materials Science, Yamagata University 4-3-16, Jonan Yonezawa City Yamagata Prefecture 992-8510 Japan
| | - Sadaki Samitsu
- National Institute for Materials Science 1-2-1, Sengen Tsukuba 305-0047 Japan
| | - Hideharu Mori
- Department of Organic Material Science, Graduate School of Organic Materials Science, Yamagata University 4-3-16, Jonan Yonezawa City Yamagata Prefecture 992-8510 Japan
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2
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Sekimori T, Fukunaga K, Oizumi H, Baba T, Totsune T, Takeda A, Sasaki T, Kawahata I. FABP2 is Involved in Intestinal α-Synuclein Pathologies. J Integr Neurosci 2024; 23:44. [PMID: 38419457 DOI: 10.31083/j.jin2302044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 12/25/2023] [Accepted: 01/03/2024] [Indexed: 03/02/2024] Open
Abstract
BACKGROUND Recently, the hypothesis that pathological α-Synuclein propagates from the gut to the brain has gained attention. Although results from animal studies support this hypothesis, the specific mechanism remains unclear. This study focused on the intestinal fatty acid-binding protein (FABP2), which is one of the subtypes of fatty acid binding proteins localizing in the gut, with the hypothesis that FABP2 is involved in the gut-to-brain propagation of α-synuclein. The aim of this study was to clarify the pathological significance of FABP2 in the pathogenesis and progression of synucleinopathy. METHODS We examined the relationship between FABP2 and α-Synuclein in the uptake of α-Synuclein into enteric neurons using primary cultured neurons derived from mouse small intestinal myenteric plexus. We also quantified disease-related protein concentrations in the plasma of patients with synucleinopathy and related diseases, and analyzed the relationship between plasma FABP2 level and progression of the disease. RESULTS Experiments on α-Synuclein uptake in primary cultured enteric neurons showed that following uptake, α-Synuclein was concentrated in areas where FABP2 was localized. Moreover, analysis of the plasma protein levels of patients with Parkinson's disease revealed that the plasma FABP2 and α-Synuclein levels fluctuate with disease duration. The FABP2/α-Synuclein ratio fluctuated more markedly than either FABP2 or α-Synuclein alone, depending on the duration of disease, indicating a higher discriminant ability of early Parkinson's disease patients from healthy patients. CONCLUSIONS These results suggest that FABP2 potentially contributes to the pathogenesis and progression of α-synucleinopathies. Thus, FABP2 is an important molecule that has the potential to elucidate the consistent mechanisms that lead from the prodromal phase to the onset and subsequent progression of synucleinopathies.
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Affiliation(s)
- Tomoki Sekimori
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Tohoku University, 980-8578 Sendai, Japan
| | - Kohji Fukunaga
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Tohoku University, 980-8578 Sendai, Japan
| | - Hideki Oizumi
- Department of Neurology, National Hospital Organization Sendai Nishitaga Hospital, 982-0805 Sendai, Japan
| | - Toru Baba
- Department of Neurology, National Hospital Organization Sendai Nishitaga Hospital, 982-0805 Sendai, Japan
| | - Tomoko Totsune
- Department of Neurology, National Hospital Organization Sendai Nishitaga Hospital, 982-0805 Sendai, Japan
| | - Atsushi Takeda
- Department of Neurology, National Hospital Organization Sendai Nishitaga Hospital, 982-0805 Sendai, Japan
| | - Takuya Sasaki
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Tohoku University, 980-8578 Sendai, Japan
| | - Ichiro Kawahata
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Tohoku University, 980-8578 Sendai, Japan
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3
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Kato Y, Iwata S, Nasu Y, Obata A, Nagata K, Campbell RE, Mizuno T. Construction of the lactate-sensing fibremats by confining sensor fluorescent protein of lactate inside nanofibers of the poly(HPMA/DAMA)/ADH-nylon 6 core-shell fibremat. RSC Adv 2023; 13:29584-29593. [PMID: 37822650 PMCID: PMC10562976 DOI: 10.1039/d3ra06108f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Accepted: 10/03/2023] [Indexed: 10/13/2023] Open
Abstract
The development of a new materials platform capable of sustaining the functionality of proteinous sensor molecules over an extended period without being affected by biological contaminants in living systems, such as proteases, is highly demanded. In this study, our primary focus was on fabricating new core-shell fibremats using unique polymer materials, capable of functionalizing encapsulated sensor proteins while resisting the effects of proteases. The core-fibre parts of core-shell fibremats were made using a newly developed post-crosslinkable water-soluble copolymer, poly(2-hydroxypropyl methacrylamide)-co-poly(diacetone methacrylamide), and the bifunctional crosslinking agent, adipic dihydrazide, while the shell layer of the nanofibers was made of nylon 6. Upon encapsulating the lactate-sensor protein eLACCO1.1 at the core-fibre part, the fibremat exhibited a distinct concentration-dependent fluorescence response, with a dynamic range of fluorescence alteration exceeding 1000% over the lactate concentration range of 0 to 100 mM. The estimated dissociation constant from the titration data was comparable to that estimated in a buffer solution. The response remained stable even after 5 cycles and in the presence of proteases. These results indicates that our core-shell fibremat platform could serve as effective immobilizing substrates for various sensor proteins, facilitating continuous and quantitative monitoring of various low-molecular-weight metabolites and catabolites in a variety of biological samples.
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Affiliation(s)
- Yuna Kato
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology Gokiso-cho, Showa-ku Nagoya Aichi 466-8555 Japan
| | - Shuichi Iwata
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology Gokiso-cho, Showa-ku Nagoya Aichi 466-8555 Japan
| | - Yusuke Nasu
- Department of Chemistry, School of Science, The University of Tokyo Bunkyo-ku Tokyo 113-0033 Japan
| | - Akiko Obata
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology Gokiso-cho, Showa-ku Nagoya Aichi 466-8555 Japan
| | - Kenji Nagata
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology Gokiso-cho, Showa-ku Nagoya Aichi 466-8555 Japan
| | - Robert E Campbell
- Department of Chemistry, School of Science, The University of Tokyo Bunkyo-ku Tokyo 113-0033 Japan
| | - Toshihisa Mizuno
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology Gokiso-cho, Showa-ku Nagoya Aichi 466-8555 Japan
- Department of Nanopharmaceutical Sciences, Graduate School of Engineering, Nagoya Institute of Technology Gokiso-cho, Showa-ku Nagoya Aichi 466-8555 Japan
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4
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Imato K, Ishii A, Kaneda N, Hidaka T, Sasaki A, Imae I, Ooyama Y. Thermally Stable Photomechanical Molecular Hinge: Sterically Hindered Stiff-Stilbene Photoswitch Mechanically Isomerizes. JACS Au 2023; 3:2458-2466. [PMID: 37772185 PMCID: PMC10523368 DOI: 10.1021/jacsau.3c00213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 07/12/2023] [Accepted: 07/13/2023] [Indexed: 09/30/2023]
Abstract
Molecular photoswitches are extensively used as molecular machines because of the small structures, simple motions, and advantages of light including high spatiotemporal resolution. Applications of photoswitches depend on the mechanical responses, in other words, whether they can generate motions against mechanical forces as actuators or can be activated and controlled by mechanical forces as mechanophores. Sterically hindered stiff stilbene (HSS) is a promising photoswitch offering large hinge-like motions in the E/Z isomerization, high thermal stability of the Z isomer, which is relatively unstable compared to the E isomer, with a half-life of ca. 1000 years at room temperature, and near-quantitative two-way photoisomerization. However, its mechanical response is entirely unexplored. Here, we elucidate the mechanochemical reactivity of HSS by incorporating one Z or E isomer into the center of polymer chains, ultrasonicating the polymer solutions, and stretching the polymer films to apply elongational forces to the embedded HSS. The present study demonstrated that HSS mechanically isomerizes only in the Z to E direction and reversibly isomerizes in combination with UV light, i.e., works as a photomechanical hinge. The photomechanically inducible but thermally irreversible hinge-like motions render HSS unique and promise unconventional applications differently from existing photoswitches, mechanophores, and hinges.
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Affiliation(s)
- Keiichi Imato
- Applied Chemistry
Program,
Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashihiroshima 739-8527, Japan
| | - Akira Ishii
- Applied Chemistry
Program,
Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashihiroshima 739-8527, Japan
| | - Naoki Kaneda
- Applied Chemistry
Program,
Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashihiroshima 739-8527, Japan
| | - Taichi Hidaka
- Applied Chemistry
Program,
Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashihiroshima 739-8527, Japan
| | - Ayane Sasaki
- Applied Chemistry
Program,
Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashihiroshima 739-8527, Japan
| | - Ichiro Imae
- Applied Chemistry
Program,
Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashihiroshima 739-8527, Japan
| | - Yousuke Ooyama
- Applied Chemistry
Program,
Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashihiroshima 739-8527, Japan
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5
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Muramatsu T, Shimizu S, Clough JM, Weder C, Sagara Y. Force-Induced Shuttling of Rotaxanes Controls Fluorescence Resonance Energy Transfer in Polymer Hydrogels. ACS Appl Mater Interfaces 2023; 15:8502-8509. [PMID: 36732315 PMCID: PMC9940108 DOI: 10.1021/acsami.2c20904] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Accepted: 01/24/2023] [Indexed: 06/18/2023]
Abstract
The molecular shuttling function of rotaxanes can be exploited to design mechanoresponsive reporter molecules. Here, we report a new approach to such rotaxane-based mechanophores, in which the fluorescence resonance energy transfer (FRET) between a donor-acceptor pair is mechanically controlled. A cyclic molecule containing a green-light-emitting FRET donor connected to a red-light-emitting FRET acceptor was threaded onto an axle equipped with a quencher at its center and two stoppers in the peripheral positions. In the force-free state, the green emitter is located near the quencher so that charge transfer interactions or photo-induced electron transfer between the two moieties suppress green emission and prevent the FRET from the green to the red emitter. The mechanophore was covalently incorporated into a linear polyurethane-urea (PUU), and stretchable hydrogels were prepared by swelling this polymer with water. Upon deformation of the PUU hydrogels and under an excitation light that selectively excites the donor, the intensity of the red fluorescence increases, as a result of a force-induced separation of the green emitter from the quencher, which enables the FRET. The switching contrast is much more pronounced in the gels than in dry films, which is due to increased molecular mobility and hydrophobic effects in the hydrogel, which both promote the formation of inclusion complexes between the ring containing the green emitter and the quencher.
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Affiliation(s)
- Tatsuya Muramatsu
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, Meguro-ku, Tokyo 152-8552, Japan
| | - Shohei Shimizu
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, Meguro-ku, Tokyo 152-8552, Japan
| | - Jessica M. Clough
- Adolphe
Merkle Institute, University of Fribourg, Chemin des Verdiers 4, Fribourg CH-1700, Switzerland
| | - Christoph Weder
- Adolphe
Merkle Institute, University of Fribourg, Chemin des Verdiers 4, Fribourg CH-1700, Switzerland
| | - Yoshimitsu Sagara
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, Meguro-ku, Tokyo 152-8552, Japan
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6
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Watanabe S, Hayashida T, Iwai M, Inomata Y, Kunitake M, Kida T. Single Crystallization of Cs 4PbBr 6 Perovskite from Supersaturated Organic Solutions Optimized Through Solubility Studies. ACS Omega 2023; 8:2455-2461. [PMID: 36687048 PMCID: PMC9850476 DOI: 10.1021/acsomega.2c06945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Accepted: 12/21/2022] [Indexed: 06/17/2023]
Abstract
We demonstrate the fabrication of millimeter-sized single crystals of 0D-Cs4PbBr6 grown in a supersaturated solution consisting of organic solvents without HBr (aq). One of the precursors, CsBr, was dissolved in ethylene glycol (EG) mixed with dimethyl sulfoxide, which is a good solvent for the other precursor, PbBr2. At a solvent ratio of 20 vol % EG, the solubility of cesium bromide decreased and the title compound, Cs4PbBr6, was selectively formed, whereas, with an EG ratio of 80 vol %, 3D-CsPbBr3 was formed. A phase diagram (solubility curve) of Cs4PbBr6 in the mixed solvent containing 20 vol % EG was obtained by visually observing dissolution and crystal precipitation while changing the temperature. Because the solubility was proportional to the temperature, the solubility curve demonstrated an upper critical solution phenomenon. The solubility near the boiling point of the solution (150 °C) was approximately 0.14 M. A single crystal of Cs4PbBr6 was formed by growing a seed crystal in a supersaturated solution on the low-temperature side of the solubility curve. X-ray analysis established the crystal structure; a fluorescence emission at 520 nm with a full width at half maximum of 20 nm confirms the composition of the single crystal to be Cs4PbBr6.
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Affiliation(s)
- Satoshi Watanabe
- Faculty
of Advanced Science and Technology, Kumamoto
University, 2-39-1 Kurokami, Chuo-ku, Kumamoto City, Kumamoto 860-8555, Japan
| | - Taiki Hayashida
- Faculty
of Advanced Science and Technology, Kumamoto
University, 2-39-1 Kurokami, Chuo-ku, Kumamoto City, Kumamoto 860-8555, Japan
| | - Masaru Iwai
- Faculty
of Advanced Science and Technology, Kumamoto
University, 2-39-1 Kurokami, Chuo-ku, Kumamoto City, Kumamoto 860-8555, Japan
| | - Yusuke Inomata
- Faculty
of Advanced Science and Technology, Kumamoto
University, 2-39-1 Kurokami, Chuo-ku, Kumamoto City, Kumamoto 860-8555, Japan
| | - Masashi Kunitake
- Institute
of Industrial Nanomaterials, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto City, Kumamoto 860-8555, Japan
| | - Tetsuya Kida
- Institute
of Industrial Nanomaterials, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto City, Kumamoto 860-8555, Japan
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