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B. Aziz S, Hamsan MH, M. Nofal M, San S, Abdulwahid RT, Raza Saeed S, Brza MA, Kadir MFZ, Mohammed SJ, Al-Zangana S. From Cellulose, Shrimp and Crab Shells to Energy Storage EDLC Cells: The Study of Structural and Electrochemical Properties of Proton Conducting Chitosan-Based Biopolymer Blend Electrolytes. Polymers (Basel) 2020; 12:polym12071526. [PMID: 32660095 PMCID: PMC7407200 DOI: 10.3390/polym12071526] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 07/05/2020] [Accepted: 07/06/2020] [Indexed: 11/16/2022] Open
Abstract
In this study, solid polymer blend electrolytes (SPBEs) based on chitosan (CS) and methylcellulose (MC) incorporated with different concentrations of ammonium fluoride (NH4F) salt were synthesized using a solution cast technique. Both Fourier transformation infrared spectroscopy (FTIR) and X-ray diffraction (XRD) results confirmed a strong interaction and dispersion of the amorphous region within the CS:MC system in the presence of NH4F. To gain better insights into the electrical properties of the samples, the results of electrochemical impedance spectroscopy (EIS) were analyzed by electrical equivalent circuit (EEC) modeling. The highest conductivity of 2.96 × 10−3 S cm−1 was recorded for the sample incorporated with 40 wt.% of NH4F. Through transference number measurement (TNM) analysis, the fraction of ions was specified. The electrochemical stability of the electrolyte sample was found to be up to 2.3 V via the linear sweep voltammetry (LSV) study. The value of specific capacitance was determined to be around 58.3 F/g. The stability test showed that the electrical double layer capacitor (EDLC) system can be recharged and discharged for up to 100 cycles with an average specific capacitance of 64.1 F/g. The synthesized EDLC cell was found to exhibit high efficiency (90%). In the 1st cycle, the values of internal resistance, energy density and power density of the EDLC cell were determined to be 65 Ω, 9.3 Wh/kg and 1282 W/kg, respectively.
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Affiliation(s)
- Shujahadeen B. Aziz
- Hameed Majid Advanced Polymeric Materials Research Lab., Department of Physics, College of Science, University of Sulaimani, Qlyasan Street, Sulaimani 46001, Kurdistan Regional Government, Iraq; (R.T.A.); (M.A.B.)
- Department of Civil Engineering, College of Engineering, Komar University of Science and Technology, Sulaimani 46001, Kurdistan Regional Government, Iraq
- Correspondence:
| | - Muhamad. H. Hamsan
- Institute for Advanced Studies, University of Malaya, Kuala Lumpur 50603, Malaysia;
| | - Muaffaq M. Nofal
- Department of Mathematics and General Sciences, Prince Sultan University, P. O. Box 66833, Riyadh 11586, Saudi Arabia;
| | - Saro San
- Department of Physics and Astronomy, University of Missouri-Kansas City, MO 64110, USA;
| | - Rebar T. Abdulwahid
- Hameed Majid Advanced Polymeric Materials Research Lab., Department of Physics, College of Science, University of Sulaimani, Qlyasan Street, Sulaimani 46001, Kurdistan Regional Government, Iraq; (R.T.A.); (M.A.B.)
- Department of Physics, College of Education, University of Sulaimani, Old Campus, Sulaimani 46001, Kurdistan Regional Government, Iraq
| | - Salah Raza Saeed
- Charmo Research Center, Charmo University, Peshawa Street, Chamchamal, Sulaimani 46001, Kurdistan Regional Government, Iraq;
| | - Mohamad A. Brza
- Hameed Majid Advanced Polymeric Materials Research Lab., Department of Physics, College of Science, University of Sulaimani, Qlyasan Street, Sulaimani 46001, Kurdistan Regional Government, Iraq; (R.T.A.); (M.A.B.)
- Manufacturing and Materials Engineering Department, Faculty of Engineering, International Islamic University of Malaysia, Kuala Lumpur 50603, Gombak, Malaysia
| | - Mohd F. Z. Kadir
- Centre for Foundation Studies in Science, University of Malaya, Kuala Lumpur 50603, Malaysia;
| | - Sewara J. Mohammed
- Department of Chemistry, College of Science, University of Sulaimani, Qlyasan Street, Sulaimani 46001, Kurdistan Regional Government, Iraq;
| | - Shakhawan Al-Zangana
- Department of Physics, College of Education, University of Garmyan, Kalar 46021, Kurdistan Regional Government, Iraq;
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152
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Faghmous N, Bouzid D, Boumaza M, Touati A, Boyron O. Optimization of chitosan-coated W/O/W multiple emulsion stabilized with Span 80 and Tween 80 using Box–Behnken design. J DISPER SCI TECHNOL 2020. [DOI: 10.1080/01932691.2020.1774387] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Naima Faghmous
- Process Engineering Laboratory for Sustainable Development and Health Products, National Polytechnic School of Constantine, Constantine, Algeria
- Department of Pharmaceutical Engineering, Faculty of Process Engineering, Salah Boubnider Constantine 3 University, Constantine, Algeria
| | - Djallel Bouzid
- Process Engineering Laboratory for Sustainable Development and Health Products, National Polytechnic School of Constantine, Constantine, Algeria
- Department of Process Engineering, National Polytechnic School of Constantine Malek Bennabi, Constantine, Algeria
| | - Marwa Boumaza
- Department of Process Engineering, National Polytechnic School of Constantine Malek Bennabi, Constantine, Algeria
| | - Asma Touati
- Department of Process Engineering, National Polytechnic School of Constantine Malek Bennabi, Constantine, Algeria
| | - Olivier Boyron
- Chemistry, Catalysis, Polymers and Processes, Villeurbanne Cedex, France
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153
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Schlichter A, Kasten MM, Parnell TJ, Cairns BR. Specialization of the chromatin remodeler RSC to mobilize partially-unwrapped nucleosomes. eLife 2020; 9:e58130. [PMID: 32496195 PMCID: PMC7308085 DOI: 10.7554/elife.58130] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Accepted: 06/03/2020] [Indexed: 12/19/2022] Open
Abstract
SWI/SNF-family chromatin remodeling complexes, such as S. cerevisiae RSC, slide and eject nucleosomes to regulate transcription. Within nucleosomes, stiff DNA sequences confer spontaneous partial unwrapping, prompting whether and how SWI/SNF-family remodelers are specialized to remodel partially-unwrapped nucleosomes. RSC1 and RSC2 are orthologs of mammalian PBRM1 (polybromo) which define two separate RSC sub-complexes. Remarkably, in vitro the Rsc1-containing complex remodels partially-unwrapped nucleosomes much better than does the Rsc2-containing complex. Moreover, a rsc1Δ mutation, but not rsc2Δ, is lethal with histone mutations that confer partial unwrapping. Rsc1/2 isoforms both cooperate with the DNA-binding proteins Rsc3/30 and the HMG protein, Hmo1, to remodel partially-unwrapped nucleosomes, but show differential reliance on these factors. Notably, genetic impairment of these factors strongly reduces the expression of genes with wide nucleosome-deficient regions (e.g., ribosomal protein genes), known to harbor partially-unwrapped nucleosomes. Taken together, Rsc1/2 isoforms are specialized through composition and interactions to manage and remodel partially-unwrapped nucleosomes.
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Affiliation(s)
- Alisha Schlichter
- Howard Hughes Medical Institute (HHMI), Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah School of MedicineSalt Lake CityUnited States
| | - Margaret M Kasten
- Howard Hughes Medical Institute (HHMI), Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah School of MedicineSalt Lake CityUnited States
| | - Timothy J Parnell
- Howard Hughes Medical Institute (HHMI), Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah School of MedicineSalt Lake CityUnited States
| | - Bradley R Cairns
- Howard Hughes Medical Institute (HHMI), Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah School of MedicineSalt Lake CityUnited States
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154
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Abstract
Hydrogels are cross-linked networks of macromolecular compounds characterized by high water absorption capacity. Such materials find a wide range of biomedical applications. Several polymeric hydrogels can also be used in cosmetics. Herein, the structure, properties and selected applications of hydrogels in cosmetics are discussed in general. Detailed examples from scientific literature are also shown. In this review paper, most common biopolymers used in cosmetics are presented in detail together with issues related to skin treatment and hair conditioning. Hydrogels based on collagen, chitosan, hyaluronic acid, and other polysaccharides have been characterized. New trends in the preparation of hydrogels based on biopolymer blends as well as bigels have been shown. Moreover, biopolymer hydrogels employment in encapsulation has been mentioned.
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Affiliation(s)
- Stanisław Mitura
- President Stanisław Wojciechowski State University of Applied Sciences in Kalisz, Medical Faculty, Nowy Świat 4 st., 62-800, Kalisz, Poland
- Technical University of Liberec, Faculty of Mechanical Engineering, Department of Material Science, Liberec, Czech Republic
| | - Alina Sionkowska
- Nicolaus Copernicus University in Torun, Faculty of Chemistry, Department of Chemistry of Biomaterials and Cosmetics, Gagarin 7 street, 87-100, Torun, Poland.
| | - Amit Jaiswal
- Centre for Biomaterials Cellular and Molecular Theranostics (CBCMT) VIT, Vellore, India
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155
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Gieroba B, Sroka-Bartnicka A, Kazimierczak P, Kalisz G, Lewalska-Graczyk A, Vivcharenko V, Nowakowski R, Pieta IS, Przekora A. Spectroscopic studies on the temperature-dependent molecular arrangements in hybrid chitosan/1,3-β-D-glucan polymeric matrices. Int J Biol Macromol 2020; 159:911-921. [PMID: 32445816 DOI: 10.1016/j.ijbiomac.2020.05.155] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Revised: 05/16/2020] [Accepted: 05/18/2020] [Indexed: 12/14/2022]
Abstract
Chitosan/1,3-β-D-glucan matrices have been recently used in various biomedical applications. Within this study, the structural changes in hybrid polysaccharide chitosan/1,3-β-D-glucan matrices cross-linked at 70 °C and 80 °C were detected with Attenuated Total Reflection Fourier Transform Infrared spectroscopy (ATR FT-IR) and Raman spectroscopy enabled thorough insights into molecular structure of studied biomaterials, whereas X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) provided their surface characteristics with confirmation of their effective and non-destructive properties. There are temperature-dependent differences in the chemical interactions between 1,3-β-D-glucan units and N-glucosamine in chitosan, resulting in surface polarity changes. The second order derivatives and deconvolution revealed the alterations in the secondary structure of studied matrices, along with different sized grain-like structures revealed by AFM. Since surface physicochemical properties of biomaterials have great impact on cell behavior, abovementioned techniques may allow to optimize and modify the preparation of polymeric matrices with desired features.
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Affiliation(s)
- Barbara Gieroba
- Department of Biopharmacy, Medical University of Lublin, Chodzki 4a, 20-093 Lublin, Poland
| | - Anna Sroka-Bartnicka
- Department of Biopharmacy, Medical University of Lublin, Chodzki 4a, 20-093 Lublin, Poland; Department of Genetics and Microbiology, Maria Curie-Sklodowska University, Akademicka 19, 20-033 Lublin, Poland.
| | - Paulina Kazimierczak
- Chair and Department of Biochemistry and Biotechnology, Medical University of Lublin, Chodzki 1, 20-093 Lublin, Poland
| | - Grzegorz Kalisz
- Department of Biopharmacy, Medical University of Lublin, Chodzki 4a, 20-093 Lublin, Poland
| | - Agnieszka Lewalska-Graczyk
- Institute of Physical Chemistry Polish Academy of Sciences, ul. Marcina Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Vladyslav Vivcharenko
- Chair and Department of Biochemistry and Biotechnology, Medical University of Lublin, Chodzki 1, 20-093 Lublin, Poland
| | - Robert Nowakowski
- Institute of Physical Chemistry Polish Academy of Sciences, ul. Marcina Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Izabela S Pieta
- Institute of Physical Chemistry Polish Academy of Sciences, ul. Marcina Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Agata Przekora
- Chair and Department of Biochemistry and Biotechnology, Medical University of Lublin, Chodzki 1, 20-093 Lublin, Poland.
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156
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Liu J, Li B, Jing H, Qin Y, Wu Y, Kong D, Leng X, Wang Z. Curcumin-crosslinked acellular bovine pericardium for the application of calcification inhibition heart valves. ACTA ACUST UNITED AC 2020; 15:045002. [PMID: 31972553 DOI: 10.1088/1748-605x/ab6f46] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Glutaraldehyde (GA) crosslinked bovine or porcine pericardium tissues exhibit high cell toxicity and calcification in the construction of bioprosthetic valves, which accelerate the failure of valve leaflets and motivate the exploration for alternatives. Polyphenols, including curcumin, procyanidin and quercetin, etc, have showed great calcification inhibition potential in crosslinking collagen and elastin scaffolds. Herein, we developed an innovative phenolic fixing technique by using curcumin as the crosslinking reagent for valvular materials. X-ray photoelectron spectroscopy and Fourier transform infrared spectrometry assessments confirmed the hydrogen bond between curcumin and acellular bovine pericardium. Importantly, the calcification inhibition capability of the curcumin-crosslinked bovine pericardium was proved by the dramatically reduced Ca2+ content in the curcumin-fixed group in in vitro assay, a juvenile rat subcutaneous implants model, as well as an osteogenic differentiation model. In addition, the results showed that the curcumin-fixed bovine pericardium exhibited better performance in the areas of mechanical performance, hemocompatibility and cytocompatibility, in comparison with the GA group and the commercialized product. In summary, we demonstrated that curcumin was a feasible crosslinking reagent to fix acellular bovine pericardium, which showed great potential for biomedical applications, particularly in cardiovascular biomaterials with calcification inhibition capacity.
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Affiliation(s)
- Jing Liu
- Tianjin Key Laboratory of Biomaterial Research, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, People's Republic of China
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157
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De Gioia R, Biella F, Citterio G, Rizzo F, Abati E, Nizzardo M, Bresolin N, Comi GP, Corti S. Neural Stem Cell Transplantation for Neurodegenerative Diseases. Int J Mol Sci 2020; 21:E3103. [PMID: 32354178 PMCID: PMC7247151 DOI: 10.3390/ijms21093103] [Citation(s) in RCA: 84] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 04/24/2020] [Accepted: 04/27/2020] [Indexed: 01/19/2023] Open
Abstract
Neurodegenerative diseases are disabling and fatal neurological disorders that currently lack effective treatment. Neural stem cell (NSC) transplantation has been studied as a potential therapeutic approach and appears to exert a beneficial effect against neurodegeneration via different mechanisms, such as the production of neurotrophic factors, decreased neuroinflammation, enhanced neuronal plasticity and cell replacement. Thus, NSC transplantation may represent an effective therapeutic strategy. To exploit NSCs' potential, some of their essential biological characteristics must be thoroughly investigated, including the specific markers for NSC subpopulations, to allow profiling and selection. Another key feature is their secretome, which is responsible for the regulation of intercellular communication, neuroprotection, and immunomodulation. In addition, NSCs must properly migrate into the central nervous system (CNS) and integrate into host neuronal circuits, enhancing neuroplasticity. Understanding and modulating these aspects can allow us to further exploit the therapeutic potential of NSCs. Recent progress in gene editing and cellular engineering techniques has opened up the possibility of modifying NSCs to express select candidate molecules to further enhance their therapeutic effects. This review summarizes current knowledge regarding these aspects, promoting the development of stem cell therapies that could be applied safely and effectively in clinical settings.
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Affiliation(s)
- Roberta De Gioia
- Foundation IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Neurology Unit, Via Francesco Sforza 35, 20122 Milan, Italy
| | - Fabio Biella
- Dino Ferrari Centre, Neuroscience Section, Department of Pathophysiology and Transplantation (DEPT), University of Milan, 20122 Milan, Italy
| | - Gaia Citterio
- Dino Ferrari Centre, Neuroscience Section, Department of Pathophysiology and Transplantation (DEPT), University of Milan, 20122 Milan, Italy
| | - Federica Rizzo
- Foundation IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Neurology Unit, Via Francesco Sforza 35, 20122 Milan, Italy
- Dino Ferrari Centre, Neuroscience Section, Department of Pathophysiology and Transplantation (DEPT), University of Milan, 20122 Milan, Italy
| | - Elena Abati
- Dino Ferrari Centre, Neuroscience Section, Department of Pathophysiology and Transplantation (DEPT), University of Milan, 20122 Milan, Italy
| | - Monica Nizzardo
- Foundation IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Neurology Unit, Via Francesco Sforza 35, 20122 Milan, Italy
- Dino Ferrari Centre, Neuroscience Section, Department of Pathophysiology and Transplantation (DEPT), University of Milan, 20122 Milan, Italy
| | - Nereo Bresolin
- Foundation IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Neurology Unit, Via Francesco Sforza 35, 20122 Milan, Italy
- Dino Ferrari Centre, Neuroscience Section, Department of Pathophysiology and Transplantation (DEPT), University of Milan, 20122 Milan, Italy
| | - Giacomo Pietro Comi
- Dino Ferrari Centre, Neuroscience Section, Department of Pathophysiology and Transplantation (DEPT), University of Milan, 20122 Milan, Italy
- Foundation IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Neuromuscular and Rare Diseases Unit, Via Francesco Sforza 35, 20122 Milan, Italy
| | - Stefania Corti
- Foundation IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Neurology Unit, Via Francesco Sforza 35, 20122 Milan, Italy
- Dino Ferrari Centre, Neuroscience Section, Department of Pathophysiology and Transplantation (DEPT), University of Milan, 20122 Milan, Italy
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158
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Li T, Chang J, Zhu Y, Wu C. 3D Printing of Bioinspired Biomaterials for Tissue Regeneration. Adv Healthc Mater 2020; 9:e2000208. [PMID: 32338464 DOI: 10.1002/adhm.202000208] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 03/14/2020] [Accepted: 03/25/2020] [Indexed: 02/06/2023]
Abstract
Biological systems, which possess remarkable functions and excellent properties, are gradually becoming a source of inspiration for the fabrication of advanced tissue regeneration biomaterials due to their hierarchical structures and novel compositions. It would be meaningful to learn and transfer the characteristics of creatures to biomaterials design. However, traditional strategies cannot satisfy the design requirements of the complicated bioinspired materials for tissue regeneration. 3D printing, as a rapidly developing new technology that can accurately achieve multimaterial and multiscale fabrication, is capable of optimizing the fabrication of bioinspired materials with complex composition and structure. This review summarizes the recent developments in 3D-printed bioinspired biomaterials for multiple tissue regeneration, and especially highlights the progresses on i) traditional bioinspired designs for biomaterials fabrication, ii) biological composition inspired designs for the 3D-printed biomaterials, and iii) biological structure inspired designs for the 3D-printed biomaterials. Finally, the challenges and prospects for the development of 3D-printed bioinspired biomaterials are discussed.
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Affiliation(s)
- Tian Li
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, No. 1295 Dingxi Road, Shanghai, 200050, P. R. China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, No. 19(A) Yuquan Road, Beijing, 100049, P. R. China
| | - Jiang Chang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, No. 1295 Dingxi Road, Shanghai, 200050, P. R. China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, No. 19(A) Yuquan Road, Beijing, 100049, P. R. China
| | - Yufang Zhu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, No. 1295 Dingxi Road, Shanghai, 200050, P. R. China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, No. 19(A) Yuquan Road, Beijing, 100049, P. R. China
| | - Chengtie Wu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, No. 1295 Dingxi Road, Shanghai, 200050, P. R. China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, No. 19(A) Yuquan Road, Beijing, 100049, P. R. China
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159
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Viéitez C, Martínez-Cebrián G, Solé C, Böttcher R, Potel CM, Savitski MM, Onnebo S, Fabregat M, Shilatifard A, Posas F, de Nadal E. A genetic analysis reveals novel histone residues required for transcriptional reprogramming upon stress. Nucleic Acids Res 2020; 48:3455-3475. [PMID: 32064518 PMCID: PMC7144942 DOI: 10.1093/nar/gkaa081] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2019] [Revised: 01/27/2020] [Accepted: 01/30/2020] [Indexed: 02/06/2023] Open
Abstract
Cells have the ability to sense, respond and adapt to environmental fluctuations. Stress causes a massive reorganization of the transcriptional program. Many examples of histone post-translational modifications (PTMs) have been associated with transcriptional activation or repression under steady-state growth conditions. Comparatively less is known about the role of histone PTMs in the cellular adaptive response to stress. Here, we performed high-throughput genetic screenings that provide a novel global map of the histone residues required for transcriptional reprogramming in response to heat and osmotic stress. Of note, we observed that the histone residues needed depend on the type of gene and/or stress, thereby suggesting a 'personalized', rather than general, subset of histone requirements for each chromatin context. In addition, we identified a number of new residues that unexpectedly serve to regulate transcription. As a proof of concept, we characterized the function of the histone residues H4-S47 and H4-T30 in response to osmotic and heat stress, respectively. Our results uncover novel roles for the kinases Cla4 and Ste20, yeast homologs of the mammalian PAK2 family, and the Ste11 MAPK as regulators of H4-S47 and H4-T30, respectively. This study provides new insights into the role of histone residues in transcriptional regulation under stress conditions.
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Affiliation(s)
- Cristina Viéitez
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), E-08003 Barcelona, Spain
- European Molecular Biology Laboratory, Genome Biology Unit, 69117 Heidelberg, Germany
| | - Gerard Martínez-Cebrián
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), E-08003 Barcelona, Spain
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac 10, 08028 Barcelona, Spain
| | - Carme Solé
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), E-08003 Barcelona, Spain
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac 10, 08028 Barcelona, Spain
| | - René Böttcher
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), E-08003 Barcelona, Spain
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac 10, 08028 Barcelona, Spain
| | - Clement M Potel
- European Molecular Biology Laboratory, Genome Biology Unit, 69117 Heidelberg, Germany
| | - Mikhail M Savitski
- European Molecular Biology Laboratory, Genome Biology Unit, 69117 Heidelberg, Germany
| | - Sara Onnebo
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), E-08003 Barcelona, Spain
| | - Marc Fabregat
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), E-08003 Barcelona, Spain
| | - Ali Shilatifard
- Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, IL 60611, USA
| | - Francesc Posas
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), E-08003 Barcelona, Spain
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac 10, 08028 Barcelona, Spain
| | - Eulàlia de Nadal
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), E-08003 Barcelona, Spain
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac 10, 08028 Barcelona, Spain
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160
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Dolkhani S, Najafpour A, Mohammadi R. Fabrication and transplantation of chitosan-selenium biodegradable nanocomposite conduit on transected sciatic nerve: a novel study in rat model. Neurol Res 2020; 42:439-450. [PMID: 32223546 DOI: 10.1080/01616412.2019.1709143] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Purpose: The improvement of techniques using conduits that connects the ends of damaged nerves and guides the growth of nerve fibers between the stumps, including adoption of natural or synthetic materials still is a challenge in peripheral nerve repair. The aim of the present novel study was to fabricate and transplant chitosan-selenium biodegradable nanocomposite conduit on transected sciatic nerve in rat model.Methods: In NORMAL group, the left sciatic nerve was exposed through a gluteal muscle incision and after careful hemostasis skin was closed. In TRANSECTED group left sciatic nerve was transected and stumps were fixed in adjacent muscle. In CHITOSAN and CSBNC groups, 10-mm sciatic nerve defects were bridged using a chitosan and chitosan-selenium biodegradable nanocomposite conduits, respectively. The regenerated fibers were studied 4, 8 and 12 weeks after surgery. Assessment of nerve regeneration was based on behavioral, functional, biomechanical, histomorphometric and immunohistochemical criteria.Results: The behavioral, functional and biomechanical studies confirmed significant recovery of regenerated axons in CSBNC group (P < 0.05). Quantitative morphometric analyses of regenerated fibers showed the number and diameter of myelinated fibers in CSBNC group were significantly higher than in the CHITOSAN group (P < 0.05).Discussion: This demonstrates the potential of using CSBNC in peripheral nerve regeneration without limitations of donor-site morbidity associated with isolation autograft. It is also cost saving and may have clinical implications for the surgical management of patients after facial nerve transection.
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Affiliation(s)
- Salar Dolkhani
- Department of Clinical Sciences, Faculty of Veterinary Medicine, Urmia Branch Islamic Azad University, Urmia, Iran
| | - Alireza Najafpour
- Department of Clinical Sciences, Faculty of Veterinary Medicine, Urmia Branch Islamic Azad University, Urmia, Iran
| | - Rahim Mohammadi
- Department of Surgery and Diagnostic Imaging, Faculty of Veterinary Medicine, Urmia University, Urmia, Iran
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161
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Bu S, Yan S, Wang R, Xia P, Zhang K, Li G, Yin J. In Situ Precipitation of Cluster and Acicular Hydroxyapatite onto Porous Poly(γ-benzyl-l-glutamate) Microcarriers for Bone Tissue Engineering. ACS Appl Mater Interfaces 2020; 12:12468-12477. [PMID: 32091198 DOI: 10.1021/acsami.9b22559] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Bone tissue engineering scaffold based on microcarriers provides an effective approach for the repair of irregular bone defects. The implantation of microcarriers by injection can reduce surgical trauma and fill various irregular shaped bone defects. Microcarriers with porous structure and osteogenic properties have shown great potential in promoting the repair of bone defects. In this study, two kinds of hydroxyapatite/poly-(γ-benzyl-l-glutamate) (HA/PBLG) microcarriers were constructed by emulsion/in situ precipitation method and their structures and properties were studied. First, PBLG porous microcarriers were prepared by an emulsion method. Surface carboxylation of PBLG microcarriers was performed to promote the deposition of HA on PBLG microcarriers. Next, the modified porous PBLG microcarriers were used as the matrix, combined with the in situ precipitation method; the cluster HA and acicular HA were precipitated onto the surface of porous microcarriers in the presence of ammonia water and tri(hydroxymethyl)aminomethane (Tris) solution, respectively. The micromorphology, composition, and element distribution of the two kinds of microcarriers were characterized by TEM, SEM, and AFM. Adipose stem cells (ADSCs) were cultured on the cluster HA/PBLG and acicular HA/PBLG microcarriers, respectively. ADSCs could grow and proliferate normally on both kinds of microcarriers wherein the acicular HA/PBLG microcarriers were more favorable for early cell adhesion and showed a beneficial effect on mineralization and osteogenic differentiation of ADSCs. Successful healing of a rabbit femur defect verified the bone regeneration ability of acicular HA/PBLG microcarriers.
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Affiliation(s)
- Shuai Bu
- Department of Polymer Materials, Shanghai University, 99 Shangda Road, Shanghai 200444, People's Republic of China
| | - Shifeng Yan
- Department of Polymer Materials, Shanghai University, 99 Shangda Road, Shanghai 200444, People's Republic of China
| | - Ruanfeng Wang
- Department of Polymer Materials, Shanghai University, 99 Shangda Road, Shanghai 200444, People's Republic of China
| | - Pengfei Xia
- Department of Polymer Materials, Shanghai University, 99 Shangda Road, Shanghai 200444, People's Republic of China
| | - Kunxi Zhang
- Department of Polymer Materials, Shanghai University, 99 Shangda Road, Shanghai 200444, People's Republic of China
| | - Guifei Li
- Department of Polymer Materials, Shanghai University, 99 Shangda Road, Shanghai 200444, People's Republic of China
| | - Jingbo Yin
- Department of Polymer Materials, Shanghai University, 99 Shangda Road, Shanghai 200444, People's Republic of China
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162
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Biranje SS, Madiwale PV, Patankar KC, Chhabra R, Bangde P, Dandekar P, Adivarekar RV. Cytotoxicity and hemostatic activity of chitosan/carrageenan composite wound healing dressing for traumatic hemorrhage. Carbohydr Polym 2020; 239:116106. [PMID: 32414437 DOI: 10.1016/j.carbpol.2020.116106] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 02/07/2020] [Accepted: 03/01/2020] [Indexed: 11/22/2022]
Abstract
Hemorrhage remains a big threat to trauma patients, especially in combat fields. Therefore, we formulated a biocompatible and biopolymer based chitosan/carrageenan composite dressing. This dressing was fabricated using freeze-drying that will serve as a promising material to promote hemostasis and tissue growth required during hemorrhage. The efficacy of dressing was evaluated for its physiochemical analysis, surface morphology, and biodegradability. Further, human dermal fibroblast cells were seeded on dressing and demonstrated non-toxic effects on the cells by showing enhanced cell attachment and proliferation. In vitro hemostatic properties of the dressing were analyzed by human Thrombin-Antithrombin assay. The dressing formed showed steady blood coagulation implying red blood cells and platelet adhesion that helped in thrombin formation, which is responsible for enhancing wound healing. Thus, it is concluded that the composite dressing can be a potent combination to accelerate hemostatic activity against hemorrhage and promote tissue growth for effective wound healing.
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163
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Faraji D, Ebrahimi M, Paknezhad B, Hami Z, Jahandideh A. Regenerative Capacities of Chitosan-Nanoselenium Conduit on Transected Sciatic Nerve in Diabetic Rats: An Animal Model Study. Bull Emerg Trauma 2020; 8:10-18. [PMID: 32201697 PMCID: PMC7071936 DOI: 10.29252/beat-080103] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Objective: To assess regenerative capacities of chitosan-nanoselenium conduit on transected sciatic nerve in diabetic rats. Methods: A 10-mm sciatic nerve defect was bridged using a chitosan-nanoselenium conduit filled with phosphate buffered saline. In chitosan group, the chitosan conduit was filled with phosphate buffered saline solution. In sham-operated group, sciatic nerve was exposed and closed. In transected group, right sciatic nerve was transected and nerve cut ends were fixed in the adjacent muscle. The regenerated fibers were studied within 12 weeks after surgery. Results: The behavioral and functional and electrophysiological tests confirmed faster recovery of the regenerated axons in chitosan-nanoselenium conduit group compared to chitosan group (p=0.001). The mean ratios of gastrocnemius muscles weight were measured. There was statistically significant difference between the muscle weight ratios of chitosan-nanoselenium conduit and chitosan groups (p=0.001). Morphometric indices of regenerated fibers showed number and diameter of the myelinated fibers were significantly higher in chitosan-nanoselenium conduit group than in chitosan group. Conclusion: chitosan-nanoselenium conduit resulted in acceleration of functional recovery and quantitative morphometric indices of sciatic nerve.
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Affiliation(s)
- Darab Faraji
- Faculty of Medicine, AJA University of Medical Sciences, Tehran, Iran
| | - Mohsen Ebrahimi
- Department of Toxicology and Pharmacology, Faculty of Medicine, AJA University of Medical Sciences, Tehran, Iran
| | - Babak Paknezhad
- Department of Toxicology and Pharmacology, Faculty of Medicine, AJA University of Medical Sciences, Tehran, Iran
| | - Zahra Hami
- Department of Toxicology and Pharmacology, Faculty of Medicine, AJA University of Medical Sciences, Tehran, Iran
| | - Alireza Jahandideh
- Department of Clinical Science, Faculty of Specialized Veterinary Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran
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164
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Thakre PK, Golla U, Biswas A, Tomar RS. Identification of Histone H3 and H4 Amino Acid Residues Important for the Regulation of Arsenite Stress Signaling in Saccharomyces cerevisiae. Chem Res Toxicol 2020; 33:817-833. [PMID: 32032493 DOI: 10.1021/acs.chemrestox.9b00471] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Arsenic is an environmental carcinogen that causes many diseases in humans, including cancers and organ failures, affecting millions of people in the world. Arsenic trioxide is a drug used for the treatment of acute promyelocytic leukemia (APL). In the present study, we screened the synthetic histone H3 and H4 library in the presence of arsenite to understand the role of histone residues in arsenic toxicity. We identified residues of histone H3 and H4 crucial for arsenite stress response. The residues H3T3, H3G90, H4K5, H4G13, and H4R95 are required for the activation of Hog1 kinase in response to arsenite exposure. We showed that a reduced level of Hog1 activation increases the intracellular arsenic content in these histone mutants through the Fps1 channel. We have also noticed the reduced expression of ACR3 exporter in the mutants. The growth defect of mutants caused by arsenite exposure was suppressed in hyperosmotic conditions, in a higher concentration of glucose, and upon deletion of the FPS1 gene. The arsenite sensitive histone mutants also showed a lack of H3K4 methylation and reduced H4K16 acetylation. Altogether, we have identified the key residues in histone H3 and H4 proteins important for the regulation of Hog1 signaling, Fps1 activity, and ACR3 expression during arsenite stress.
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Affiliation(s)
- Pilendra Kumar Thakre
- Laboratory of Chromatin Biology, Department of Biological Sciences, Indian Institute of Science Education and Research Bhopal, Bhopal 462066, India
| | - Upendarrao Golla
- Division of Hematology and Oncology, Penn State College of Medicine, Hershey, Pennsylvania 17033, United States
| | - Ashis Biswas
- Environmental Geochemistry Laboratory, Department of Earth and Environmental Sciences (EES), Indian Institute of Science Education and Research Bhopal, Bhopal 462066, India
| | - Raghuvir Singh Tomar
- Laboratory of Chromatin Biology, Department of Biological Sciences, Indian Institute of Science Education and Research Bhopal, Bhopal 462066, India
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165
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Zhang J, Zhou J, Yuan Q, Zhan C, Shang Z, Gu Q, Zhang J, Fu G, Hu W. Characterization of ginsenoside compound K loaded ionically cross-linked carboxymethyl chitosan-calcium nanoparticles and its cytotoxic potential against prostate cancer cells. J Ginseng Res 2021; 45:228-35. [PMID: 33841003 DOI: 10.1016/j.jgr.2020.01.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2019] [Revised: 01/24/2020] [Accepted: 01/30/2020] [Indexed: 02/06/2023] Open
Abstract
Backgroud Ginsenoside compound K (GK) is a major metabolite of protopanaxadiol-type ginsenosides and has remarkable anticancer activities in vitro and in vivo. This work used an ionic cross-linking method to entrap GK within O-carboxymethyl chitosan (OCMC) nanoparticles (Nps) to form GK-loaded OCMC Nps (GK–OCMC Nps), which enhance the aqueous solubility and stability of GK. Methods The GK–OCMC Nps were characterized using several physicochemical techniques, including x-ray diffraction, transmission electron microscopy, zeta potential analysis, and particle size analysis via dynamic light scattering. GK was released from GK–OCMC Nps and was conducted using the dialysis bag diffusion method. The effects of GK and GK–OCMC Nps on PC3 cell viability were measured by using the 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide assay. Fluorescent technology based on Cy5.5-labeled probes was used to explore the cellular uptake of GK–OCMC Nps. Results The GK–OCMC NPs had a suitable particle size and zeta potential; they were spherical with good dispersion. In vitro drug release from GK–OCMC NPs was pH dependent. Moreover, the in vitro cytotoxicity study and cellular uptake assays indicated that the GK–OCMC Nps significantly enhanced the cytotoxicity and cellular uptake of GK toward the PC3 cells. GK–OCMC Nps also significantly promoted the activities of both caspase-3 and caspase-9. Conclusion GK–OCMC Nps are potential nanocarriers for delivering hydrophobic drugs, thereby enhancing water solubility and permeability and improving the antiproliferative effects of GK.
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166
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Thapa RK, Diep DB, Tønnesen HH. Topical antimicrobial peptide formulations for wound healing: Current developments and future prospects. Acta Biomater 2020; 103:52-67. [PMID: 31874224 DOI: 10.1016/j.actbio.2019.12.025] [Citation(s) in RCA: 176] [Impact Index Per Article: 44.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 12/16/2019] [Accepted: 12/18/2019] [Indexed: 12/20/2022]
Abstract
Antimicrobial peptides (AMPs) are the natural antibiotics recognized for their potent antibacterial and wound healing properties. Bare AMPs have limited activity following topical application attributable to their susceptibility to environment (hydrolysis, oxidation, photolysis), and wound (alkaline pH, proteolysis) related factors as well as minimal residence time. Therefore, the formulation of AMPs is essential to enhance stability, prolong delivery, and optimize effectiveness at the wound site. Different topical formulations of AMPs have been developed so far including nanoparticles, hydrogels, creams, ointments, and wafers to aid in controlling bacterial infection and enhance wound healing process in vivo. Herein, an overview is provided of the AMPs and current understanding of their formulations for topical wound healing applications along with suitable examples. Furthermore, future prospects for the development of effective combination AMP formulations are discussed. STATEMENT OF SIGNIFICANCE: Chronic wound infection and subsequent development of antibiotic resistance are serious clinical problems affecting millions of people worldwide. Antimicrobial peptides (AMPs) possess great potential in effectively killing the bacteria with minimal risk of resistance development. However, AMPs susceptibility to degradation following topical application limits their antimicrobial and wound healing effects. Therefore, development of an optimized topical formulation with high peptide stability and sustained AMP delivery is necessary to maximize the antimicrobial and wound healing effects. The present review provides an overview of the state-of-art in the field of topical AMP formulations for wound healing. Current developments in the field of topical AMP formulations are reviewed and future prospects for the development of effective combination AMP formulations are discussed.
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167
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Cembran A, Bruggeman KF, Williams RJ, Parish CL, Nisbet DR. Biomimetic Materials and Their Utility in Modeling the 3-Dimensional Neural Environment. iScience 2020; 23:100788. [PMID: 31954980 PMCID: PMC6970178 DOI: 10.1016/j.isci.2019.100788] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 10/30/2019] [Accepted: 12/13/2019] [Indexed: 02/06/2023] Open
Abstract
The brain is a complex 3-dimensional structure, the organization of which provides a local environment that directly influences the survival, proliferation, differentiation, migration, and plasticity of neurons. To probe the effects of damage and disease on these cells, a synthetic environment is needed. Three-dimensional culturing of stem cells, neural progenitors, and neurons within fabricated biomaterials has demonstrated superior biomimetic properties over conventional 2-dimensional cultureware, offering direct recapitulation of both cell-cell and cell-extracellular matrix interactions. Within this review we address the benefits of deploying biomaterials as advanced cell culture tools capable of influencing neuronal fate and as in vitro models of the native in vivo microenvironment. We highlight recent and promising biomaterials approaches toward understanding neural network and their function relevant to neurodevelopment and provide our perspective on how these materials can be engineered and programmed to study both the healthy and diseased nervous system.
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Affiliation(s)
- Arianna Cembran
- Laboratory of Advanced Biomaterials, Research School of Electrical, Energy and Materials Engineering, The Australian National University, Canberra, ACT 2600, Australia
| | - Kiara F Bruggeman
- Laboratory of Advanced Biomaterials, Research School of Electrical, Energy and Materials Engineering, The Australian National University, Canberra, ACT 2600, Australia
| | | | - Clare L Parish
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Melbourne, VIC 3010, Australia.
| | - David R Nisbet
- Laboratory of Advanced Biomaterials, Research School of Electrical, Energy and Materials Engineering, The Australian National University, Canberra, ACT 2600, Australia.
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168
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Li J, Yu F, Chen G, Liu J, Li XL, Cheng B, Mo XM, Chen C, Pan JF. Moist-Retaining, Self-Recoverable, Bioadhesive, and Transparent in Situ Forming Hydrogels To Accelerate Wound Healing. ACS Appl Mater Interfaces 2020; 12:2023-2038. [PMID: 31895528 DOI: 10.1021/acsami.9b17180] [Citation(s) in RCA: 85] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In the management of accelerating wound healing, moist environments play an important role. Compared with other scaffolds of various forms, hydrogels can maintain a moist environment in the wound area. They are cross-linked hydrophilic polymeric networks that resemble natural soft tissues and extracellular matrices. Among them, injectable hydrogels have attracted great attention in wound repair, as they can be injected into irregular-shaped skin defects and formed in situ to shape the contour of different dimensions. The excellent compliance makes hydrogels easy to adapt to the wound under different conditions of skin movement. Here, we oxidized hydroxyethyl starch (O-HES) and modified carboxymethyl chitosan (M-CMCS) to fabricate an in situ forming hydrogel with excellent self-recoverable extensibility-compressibility, biocompatibility, biodegradability, and transparency for accelerating wound healing. The oxidation degree of O-HES was 74%. The amino modification degree of M-CMCS was 63%. M-CMCS/O-HES hydrogels were formed through the Schiff base reaction. The physicochemical properties of M-CMCS/O-HES hydrogels with various ratios were investigated, and M-CMCS/O-HES hydrogel with a volume ratio of 5:5 exhibited appropriate gelation time, notable water-retaining capacity, self-recoverable conformal deformation, suitable biodegradability, and good biocompatibility for wound-healing application. Then, skin wound-healing experimental studies were carried out in Sprague-Dawley rats with full-thickness skin defects. Significant outcomes were achieved in the M-CMCS/O-HES hydrogel-treated group including higher wound closure percentage, more granulation tissue formation, faster epithelialization, and decreased collagen deposition. These findings demonstrate that using the obtained M-CMCS/O-HES hydrogels is a promising therapeutic strategy for wound healing.
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Affiliation(s)
- Jun Li
- Department of Orthopedics , Shanghai Tenth People's Hospital Affiliated to Tongji University , 301 Yanchang Road , Shanghai 200072 , China
| | - Fan Yu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Chemistry, Chemical Engineering and Biotechnology , Donghua University , 2999 North Renmin Road , Shanghai 201620 , China
| | - Gong Chen
- School of Environmental and Materials Engineering, College of Engineering , Shanghai Polytechnic University , Shanghai 201209 , China
| | - Jia Liu
- Department of Orthopedics , Shidong Hospital of Yangpu District , 999 Shiguang Road , Shanghai 200438 , China
| | - Xiao-Long Li
- Department of Orthopedics , Changhai Hospital, Naval Military Medical University , Shanghai 200433 , China
| | - Biao Cheng
- Department of Orthopedics , Shanghai Tenth People's Hospital Affiliated to Tongji University , 301 Yanchang Road , Shanghai 200072 , China
| | - Xiu-Mei Mo
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Chemistry, Chemical Engineering and Biotechnology , Donghua University , 2999 North Renmin Road , Shanghai 201620 , China
| | - Cheng Chen
- School of Environmental and Materials Engineering, College of Engineering , Shanghai Polytechnic University , Shanghai 201209 , China
| | - Jian-Feng Pan
- Department of Orthopedics , Shanghai Tenth People's Hospital Affiliated to Tongji University , 301 Yanchang Road , Shanghai 200072 , China
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169
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Abstract
Methylation of histone H3K4 is a hallmark of actively transcribed genes that depends on mono-ubiquitination of histone H2B (H2B-Ub). H3K4 methylation in yeast is catalyzed by Set1, the methyltransferase subunit of COMPASS. We report here the cryo-EM structure of a six-protein core COMPASS subcomplex, which can methylate H3K4 and be stimulated by H2B-Ub, bound to a ubiquitinated nucleosome. Our structure shows that COMPASS spans the face of the nucleosome, recognizing ubiquitin on one face of the nucleosome and methylating H3 on the opposing face. As compared to the structure of the isolated core complex, Set1 undergoes multiple structural rearrangements to cement interactions with the nucleosome and with ubiquitin. The critical Set1 RxxxRR motif adopts a helix that mediates bridging contacts between the nucleosome, ubiquitin and COMPASS. The structure provides a framework for understanding mechanisms of trans-histone cross-talk and the dynamic role of H2B ubiquitination in stimulating histone methylation.
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Affiliation(s)
- Evan J Worden
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, United States
| | - Xiangbin Zhang
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, United States
| | - Cynthia Wolberger
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, United States
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170
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Liu J, Li J, Yu F, Zhao YX, Mo XM, Pan JF. In situ forming hydrogel of natural polysaccharides through Schiff base reaction for soft tissue adhesive and hemostasis. Int J Biol Macromol 2020; 147:653-666. [PMID: 31923505 DOI: 10.1016/j.ijbiomac.2020.01.005] [Citation(s) in RCA: 69] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 12/21/2019] [Accepted: 01/02/2020] [Indexed: 01/14/2023]
Abstract
In this study, a novel injectable hydrogel with biocompatibility and biodegradability through Schiff base reaction was prepared for soft tissue adhesive and hemostasis. Aldehyde hydroxyethyl starch (AHES) was prepared by oxidizing hydroxyethyl starch to get aldehyde groups. Amino carboxymethyl chitosan (ACC) was prepared by grafting ethylenediamine onto carboxymethyl chitosan to get more amino groups. Two-component AHES/ACC hydrogel was formed through Schiff base reaction between aldehyde and amino groups. By changing the reaction conditions various contents of aldehyde and amino group were achieved. The properties of AHES/ACC hydrogel were tunable including gelation time, swelling ratio, degradation and mechanical tensile by varying the content of aldehyde and amino groups. Then biocompatibility measurements showed that AHES/ACC hydrogels supported cell viability and proliferation in vitro and exhibited good biodegradability and biocompatibility in vivo. AHES/ACC hydrogel also had effective hemostatic ability. Thus, this study provides a strategy for the design and fabrication of fast in situ forming hydrogels. Through Schiff base reaction in situ forming hydrogel derived from natural polysaccharides can be modulated and prepared for soft tissue adhesive, hemostasis or other biomedical applications in future.
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Affiliation(s)
- Jia Liu
- Department of Orthopedics, Shanghai Tenth People's Hospital affiliated to Tongji University, 301 Yanchang Road, Shanghai 200072, China; Department of Orthopedics, Shidong Hospital of Yangpu District, 999 Shiguang Road, Shanghai 200438, China
| | - Jun Li
- Department of Orthopedics, Shanghai Tenth People's Hospital affiliated to Tongji University, 301 Yanchang Road, Shanghai 200072, China
| | - Fan Yu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, 2999 North Renmin Road, Shanghai 201620, China
| | - Ya-Xin Zhao
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, 2999 North Renmin Road, Shanghai 201620, China
| | - Xiu-Mei Mo
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, 2999 North Renmin Road, Shanghai 201620, China.
| | - Jian-Feng Pan
- Department of Orthopedics, Shanghai Tenth People's Hospital affiliated to Tongji University, 301 Yanchang Road, Shanghai 200072, China.
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Pinho AC, Vieira Branquinho M, Alvites RD, Fonseca AC, Caseiro AR, Santos Pedrosa S, Luís AL, Pires I, Prada J, Muratori L, Ronchi G, Geuna S, Santos JD, Maurício AC, Serra AC, Coelho JFJ. Dextran-based tube-guides for the regeneration of the rat sciatic nerve after neurotmesis injury. Biomater Sci 2020; 8:798-811. [PMID: 31904045 DOI: 10.1039/c9bm00901a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
In this work, dextran-based nerve tube-guides were prepared, characterized and used in a standardized animal model of neurotmesis injury. Non-porous and porous transparent tube-guides were obtained by photocrosslinking of two co-macromonomers based on dextran and poly(ε-caprolactone) (PCL). Swelling capacity of the tube-guides ranged from 40-60% with no visible constriction of their inner diameter. In vitro hydrolytic degradation tests showed that the tube-guides maintained their structural integrity up to 6 months. The in vivo performance of the tube-guides was evaluated by entubulation of the rat sciatic nerve after a neurotmesis injury, with a 10 mm-gap between the nerve stumps. The results showed that the tube-guides were able to promote the regeneration of the nerve in a similar manner to what was observed with conventional techniques (nerve graft and end-to-end suture). Stereological analysis proved that nerve regeneration occurred, and both tube-guides presented fibre diameter and g-ratio closer to healthy sciatic nerves. The histomorphometric analysis of Tibialis anterior (TA) skeletal muscle showed decreased neurogenic atrophy in the porous tube-guides treated group, presenting measurements that are similar to the uninjured control.
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Affiliation(s)
- Ana Catarina Pinho
- CEMMPRE, Department of Chemical Engineering, Rua Sílvio Lima-Pólo II, 3030-790 Coimbra, Portugal.
| | - Mariana Vieira Branquinho
- Veterinary Clinics Department, Abel Salazar Biomedical Sciences Institute (ICBAS), University of Porto (UP), Rua de Jorge Viterbo Ferreira, no. 228, 4050-313 Porto, Portugal and Animal Science Study Centre (CECA), University of Porto Agroenvironment, Technologies and Sciences Institute (ICETA), Rua D. Manuel II, Apartado 55142, 4051-401 Porto, Portugal
| | - Rui Damásio Alvites
- Veterinary Clinics Department, Abel Salazar Biomedical Sciences Institute (ICBAS), University of Porto (UP), Rua de Jorge Viterbo Ferreira, no. 228, 4050-313 Porto, Portugal and Animal Science Study Centre (CECA), University of Porto Agroenvironment, Technologies and Sciences Institute (ICETA), Rua D. Manuel II, Apartado 55142, 4051-401 Porto, Portugal
| | - Ana Clotilde Fonseca
- CEMMPRE, Department of Chemical Engineering, Rua Sílvio Lima-Pólo II, 3030-790 Coimbra, Portugal.
| | - Ana Rita Caseiro
- Veterinary Clinics Department, Abel Salazar Biomedical Sciences Institute (ICBAS), University of Porto (UP), Rua de Jorge Viterbo Ferreira, no. 228, 4050-313 Porto, Portugal and Animal Science Study Centre (CECA), University of Porto Agroenvironment, Technologies and Sciences Institute (ICETA), Rua D. Manuel II, Apartado 55142, 4051-401 Porto, Portugal and Vasco da Gama University School/Escola Universitária Vasco da Gama (EUVG), Av. José R. Sousa Fernandes 197, Campus Universitário - Bloco B, Lordemão, 3020-210 Coimbra, Portugal
| | - Sílvia Santos Pedrosa
- Veterinary Clinics Department, Abel Salazar Biomedical Sciences Institute (ICBAS), University of Porto (UP), Rua de Jorge Viterbo Ferreira, no. 228, 4050-313 Porto, Portugal and Animal Science Study Centre (CECA), University of Porto Agroenvironment, Technologies and Sciences Institute (ICETA), Rua D. Manuel II, Apartado 55142, 4051-401 Porto, Portugal
| | - Ana Lúcia Luís
- Veterinary Clinics Department, Abel Salazar Biomedical Sciences Institute (ICBAS), University of Porto (UP), Rua de Jorge Viterbo Ferreira, no. 228, 4050-313 Porto, Portugal and Animal Science Study Centre (CECA), University of Porto Agroenvironment, Technologies and Sciences Institute (ICETA), Rua D. Manuel II, Apartado 55142, 4051-401 Porto, Portugal
| | - Isabel Pires
- CECAV and Department of Veterinary Sciences, University of Trás-os-Montes and Alto Douro, 5001-801 Vila Real, Portugal
| | - Justina Prada
- CECAV and Department of Veterinary Sciences, University of Trás-os-Montes and Alto Douro, 5001-801 Vila Real, Portugal
| | - Luísa Muratori
- Neuroscience Institute of the Cavalieri Ottolenghi Foundation and Department of Clinical and Biological Sciences, University of Turin, 10043 Turin, Italy
| | - Giulia Ronchi
- Neuroscience Institute of the Cavalieri Ottolenghi Foundation and Department of Clinical and Biological Sciences, University of Turin, 10043 Turin, Italy
| | - Stefano Geuna
- CECAV and Department of Veterinary Sciences, University of Trás-os-Montes and Alto Douro, 5001-801 Vila Real, Portugal
| | - José Domingos Santos
- REQUIMTE-LAQV, Department of Metallurgy and Materials, Faculty of Engineering, University of Porto, Rua Dr Roberto Frias s/n, 4200-465 Porto, Portugal
| | - Ana Colette Maurício
- Veterinary Clinics Department, Abel Salazar Biomedical Sciences Institute (ICBAS), University of Porto (UP), Rua de Jorge Viterbo Ferreira, no. 228, 4050-313 Porto, Portugal and Animal Science Study Centre (CECA), University of Porto Agroenvironment, Technologies and Sciences Institute (ICETA), Rua D. Manuel II, Apartado 55142, 4051-401 Porto, Portugal
| | - Arménio Coimbra Serra
- CEMMPRE, Department of Chemical Engineering, Rua Sílvio Lima-Pólo II, 3030-790 Coimbra, Portugal.
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Abstract
Alzheimer's disease (AD) is the most common neurodegenerative disease caused by eventually aggregated amyloid β (Aβ) plaques in degenerating neurons of the aging brain. These aggregated protein plaques mainly consist of Aβ fibrils and neurofibrillary tangles (NFTs) of phosphorylated tau protein. Even though some cholinesterase inhibitors, NMDA receptor antagonist, and monoclonal antibodies were developed to inhibit neurodegeneration or activate neural regeneration or clear off the Aβ deposits, none of the treatment is effective in improving the cognitive and memory dysfunctions of the AD patients. Thus, stem cell therapy represents a powerful tool for the treatment of AD. In addition to discussing the advents in molecular pathogenesis and animal models of this disease and the treatment approaches using small molecules and immunoglobulins against AD, we will focus on the stem cell sources for AD using neural stem cells (NSCs); embryonic stem cells (ESCs); and mesenchymal stem cells (MSCs) from bone marrow, umbilical cord, and umbilical cord blood. In particular, patient-specific-induced pluripotent stem cells (iPS cells) are proposed as a future prospective and the challenges for the treatment of AD.
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173
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Reshamwala R, Shah M, Belt L, Ekberg JAK, St John JA. Reliable cell purification and determination of cell purity: crucial aspects of olfactory ensheathing cell transplantation for spinal cord repair. Neural Regen Res 2020; 15:2016-2026. [PMID: 32394949 PMCID: PMC7716040 DOI: 10.4103/1673-5374.282218] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Transplantation of olfactory ensheathing cells, the glia of the primary olfactory nervous system, has been trialed for spinal cord injury repair with promising but variable outcomes in animals and humans. Olfactory ensheathing cells can be harvested either from the lamina propria beneath the neuroepithelium in the nasal cavity, or from the olfactory bulb in the brain. As these areas contain several other cell types, isolating and purifying olfactory ensheathing cells is a critical part of the process. It is largely unknown how contaminating cells such as fibroblasts, other glial cell types and supporting cells affect olfactory ensheathing cell function post-transplantation; these cells may also cause unwanted side-effects. It is also, however, possible that the presence of some of the contaminant cells can improve outcomes. Here, we reviewed the last decade of olfactory ensheathing cell transplantation studies in rodents, with a focus on olfactory ensheathing cell purity. We analyzed how purification methods and resultant cell purity differed between olfactory mucosa- and olfactory bulb-derived cell preparations. We analyzed how the studies reported on olfactory ensheathing cell purity and which criteria were used to define cells as olfactory ensheathing cells. Finally, we analyzed the correlation between cell purity and transplantation outcomes. We found that olfactory bulb-derived olfactory ensheathing cell preparations are typically purer than mucosa-derived preparations. We concluded that there is an association between high olfactory ensheathing cell purity and favourable outcomes, but the lack of olfactory ensheathing cell-specific markers severely hampers the field.
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Affiliation(s)
- Ronak Reshamwala
- Griffith Institute for Drug Discovery, Griffith University, Brisbane; Menzies Health Institute Queensland, Griffith University, Southport; Clem Jones Centre for Neurobiology and Stem Cell Research, Griffith University, Brisbane, QLD, Australia
| | - Megha Shah
- Menzies Health Institute Queensland, Griffith University, Southport; Clem Jones Centre for Neurobiology and Stem Cell Research, Griffith University, Brisbane, QLD, Australia
| | - Lucy Belt
- Menzies Health Institute Queensland, Griffith University, Southport; Clem Jones Centre for Neurobiology and Stem Cell Research, Griffith University, Brisbane, QLD, Australia
| | - Jenny A K Ekberg
- Griffith Institute for Drug Discovery, Griffith University, Brisbane; Menzies Health Institute Queensland, Griffith University, Southport; Clem Jones Centre for Neurobiology and Stem Cell Research, Griffith University, Brisbane, QLD, Australia
| | - James A St John
- Griffith Institute for Drug Discovery, Griffith University, Brisbane; Menzies Health Institute Queensland, Griffith University, Southport; Clem Jones Centre for Neurobiology and Stem Cell Research, Griffith University, Brisbane, QLD, Australia
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174
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Wu Y, Zhang S, Gong X, Yu Q, Zhang Y, Luo M, Zhang X, Workman JL, Yu X, Li S. Glycolysis regulates gene expression by promoting the crosstalk between H3K4 trimethylation and H3K14 acetylation in Saccharomyces cerevisiae. J Genet Genomics 2019; 46:561-574. [PMID: 32014433 DOI: 10.1016/j.jgg.2019.11.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Revised: 11/18/2019] [Accepted: 11/25/2019] [Indexed: 12/13/2022]
Abstract
Cells need to coordinate gene expression with their metabolic states to maintain cell homeostasis and growth. However, how cells transduce nutrient availability to appropriate gene expression response via histone modifications remains largely unknown. Here, we report that glucose specifically induces histone H3K4 trimethylation (H3K4me3), an evolutionarily conserved histone covalent modification associated with active gene transcription, and that glycolytic enzymes and metabolites are required for this induction. Although glycolysis supplies S-adenosylmethionine for histone methyltransferase Set1 to catalyze H3K4me3, glucose induces H3K4me3 primarily by inhibiting histone demethylase Jhd2-catalyzed H3K4 demethylation. Glycolysis provides acetyl-CoA to stimulate histone acetyltransferase Gcn5 to acetylate H3K14, which then inhibits the binding of Jhd2 to chromatin to increase H3K4me3. By repressing Jhd2-mediated H3K4 demethylation, glycolytic enzymes regulate gene expression and cell survival during chronological aging. Thus, our results elucidate how cells reprogram their gene expression programs in response to glucose availability via histone modifications.
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Affiliation(s)
- Yinsheng Wu
- State Key Laboratory of Biocatalysis and Enzyme Engineering, College of Life Sciences, Hubei University, Wuhan, Hubei, 430062, China
| | - Shihao Zhang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, College of Life Sciences, Hubei University, Wuhan, Hubei, 430062, China
| | - Xuanyunjing Gong
- State Key Laboratory of Biocatalysis and Enzyme Engineering, College of Life Sciences, Hubei University, Wuhan, Hubei, 430062, China
| | - Qi Yu
- State Key Laboratory of Biocatalysis and Enzyme Engineering, College of Life Sciences, Hubei University, Wuhan, Hubei, 430062, China
| | - Yuan Zhang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, College of Life Sciences, Hubei University, Wuhan, Hubei, 430062, China
| | - Mingdan Luo
- State Key Laboratory of Biocatalysis and Enzyme Engineering, College of Life Sciences, Hubei University, Wuhan, Hubei, 430062, China
| | - Xianhua Zhang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, College of Life Sciences, Hubei University, Wuhan, Hubei, 430062, China.
| | - Jerry L Workman
- Stowers Institute for Medical Research, 1000 E. 50th Street, Kansas City, MO, 64110, USA
| | - Xilan Yu
- State Key Laboratory of Biocatalysis and Enzyme Engineering, College of Life Sciences, Hubei University, Wuhan, Hubei, 430062, China.
| | - Shanshan Li
- State Key Laboratory of Biocatalysis and Enzyme Engineering, College of Life Sciences, Hubei University, Wuhan, Hubei, 430062, China.
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175
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Han F, Liu C, Huang J, Chen J, Wei C, Geng X, Liu Y, Han D, Li M. The application of patient-derived induced pluripotent stem cells for modeling and treatment of Alzheimer’s disease. Brain Science Advances 2019. [DOI: 10.1177/2096595819896178] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Alzheimer’s disease (AD) is the most prevalent age-related neurodegenerative disease which is mainly caused by aggregated protein plaques in degenerating neurons of the brain. These aggregated protein plaques are mainly consisting of amyloid β (Aβ) fibrils and neurofibrillary tangles (NFTs) of phosphorylated tau protein. Even though the transgenic murine models can recapitulate some of the AD phenotypes, they are not the human cell models of AD. Recent breakthrough in somatic cell reprogramming made it available to use induced pluripotent stem cells (iPSCs) for patientspecific disease modeling and autologous transplantation therapy. Human iPSCs provide alternative ways to obtain specific human brain cells of AD patients to study the molecular mechanisms and therapeutic approaches for familial and sporadic forms of AD. After differentiation into neuronal cells, iPSCs have enabled the investigation of the complex aetiology and timescale over which AD develops in human brain. Here, we first go over the pathological process of and transgenic models of AD. Then we discuss the application of iPSC for disease model and cell transplantation. At last the challenges and future applications of iPSCs for AD will be summarized to propose cell-based approaches for the treatment of this devastating disorder.
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Affiliation(s)
- Fabin Han
- The Institute for Tissue Engineering and Regenerative Medicine, Liaocheng University/Liaocheng People’s Hospital, Shandong 252000, China
- The Translational Research Lab for Stem Cells and Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, Shandong 250355, China
- These authors contributed equally to this work
| | - Chuanguo Liu
- The Translational Research Lab for Stem Cells and Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, Shandong 250355, China
- These authors contributed equally to this work
| | - Jin Huang
- Key Laboratory of Tissue Repair and Regeneration of PLA and Beijing Key Research Laboratory of Skin Injury, Repair and Regeneration, The Fourth Medical Centre of PLA General Hospital, Beijing 100048, China
- These authors contributed equally to this work
| | - Juanli Chen
- The Institute for Tissue Engineering and Regenerative Medicine, Liaocheng University/Liaocheng People’s Hospital, Shandong 252000, China
| | - Chuanfei Wei
- The Institute for Tissue Engineering and Regenerative Medicine, Liaocheng University/Liaocheng People’s Hospital, Shandong 252000, China
| | - Xiwen Geng
- The Translational Research Lab for Stem Cells and Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, Shandong 250355, China
| | - Yanming Liu
- The Institute for Tissue Engineering and Regenerative Medicine, Liaocheng University/Liaocheng People’s Hospital, Shandong 252000, China
| | - Dong Han
- Shandong Molecular Diagnostics & Cell Therapeutic Biotechnology Corporation, Ji’nan, Shandong 250001, China
| | - Mengpeng Li
- The Institute for Tissue Engineering and Regenerative Medicine, Liaocheng University/Liaocheng People’s Hospital, Shandong 252000, China
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176
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Cucinotta CE, Hildreth AE, McShane BM, Shirra MK, Arndt KM. The nucleosome acidic patch directly interacts with subunits of the Paf1 and FACT complexes and controls chromatin architecture in vivo. Nucleic Acids Res 2019; 47:8410-8423. [PMID: 31226204 PMCID: PMC6895269 DOI: 10.1093/nar/gkz549] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 06/07/2019] [Accepted: 06/11/2019] [Indexed: 12/12/2022] Open
Abstract
The nucleosome core regulates DNA-templated processes through the highly conserved nucleosome acidic patch. While structural and biochemical studies have shown that the acidic patch controls chromatin factor binding and activity, few studies have elucidated its functions in vivo. We employed site-specific crosslinking to identify proteins that directly bind the acidic patch in Saccharomyces cerevisiae and demonstrated crosslinking of histone H2A to Paf1 complex subunit Rtf1 and FACT subunit Spt16. Rtf1 bound to nucleosomes through its histone modification domain, supporting its role as a cofactor in H2B K123 ubiquitylation. An acidic patch mutant showed defects in nucleosome positioning and occupancy genome-wide. Our results provide new information on the chromatin engagement of two central players in transcription elongation and emphasize the importance of the nucleosome core as a hub for proteins that regulate chromatin during transcription.
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Affiliation(s)
- Christine E Cucinotta
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - A Elizabeth Hildreth
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Brendan M McShane
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Margaret K Shirra
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Karen M Arndt
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA
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177
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Selvam K, Rahman SA, Li S. Histone H4 H75E mutation attenuates global genomic and Rad26-independent transcription-coupled nucleotide excision repair. Nucleic Acids Res 2019; 47:7392-7401. [PMID: 31114907 PMCID: PMC6698655 DOI: 10.1093/nar/gkz453] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 05/08/2019] [Accepted: 05/10/2019] [Indexed: 01/06/2023] Open
Abstract
Nucleotide excision repair (NER) consists of global genomic NER (GG-NER) and transcription coupled NER (TC-NER) subpathways. In eukaryotic cells, genomic DNA is wrapped around histone octamers (an H3–H4 tetramer and two H2A–H2B dimers) to form nucleosomes, which are well known to profoundly inhibit the access of NER proteins. Through unbiased screening of histone H4 residues in the nucleosomal LRS (loss of ribosomal DNA-silencing) domain, we identified 24 mutations that enhance or decrease UV sensitivity of Saccharomyces cerevisiae cells. The histone H4 H75E mutation, which is largely embedded in the nucleosome and interacts with histone H2B, significantly attenuates GG-NER and Rad26-independent TC-NER but does not affect TC-NER in the presence of Rad26. All the other histone H4 mutations, except for T73F and T73Y that mildly attenuate GG-NER, do not substantially affect GG-NER or TC-NER. The attenuation of GG-NER and Rad26-independent TC-NER by the H4H75E mutation is not due to decreased chromatin accessibility, impaired methylation of histone H3 K79 that is at the center of the LRS domain, or lowered expression of NER proteins. Instead, the attenuation is at least in part due to impaired recruitment of Rad4, the key lesion recognition and verification protein, to chromatin following induction of DNA lesions.
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Affiliation(s)
- Kathiresan Selvam
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA
| | - Sheikh Arafatur Rahman
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA
| | - Shisheng Li
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA
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178
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Wang X, Chen W, Liu Q, Liu L. Genistein adsorbed mesoporous bioactive glass with enhanced osteogenesis properties. Biotechnol Lett 2019; 42:321-328. [PMID: 31776752 DOI: 10.1007/s10529-019-02773-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Accepted: 11/22/2019] [Indexed: 01/26/2023]
Abstract
OBJECTIVE Mesoporous bioactive glass (MBG) has good biocompatibility without immune reaction after implanting into tissue as biomaterial which was used in the treatment of bone defect. Genistein (G), a phytoestrogen, could be used in the treatment of osteoporosis in postmenopausal women. RESULTS Here, we report that MBG with large pores (MBG-L) and MBG-L adsorbed with G (MBG-L/G) sustained-release G could enhance osteoblast differentiation and matrix mineralization. Interestingly, we observed that MBG-L enhanced the formation of bone-like deposit and Ca deposition in vitro. In the other side, we also found that MBG-L/G substrate could promote osteoblast differentiation and matrix mineralization through Erk activated Runx2 pathway. Interestingly, the expression of osteoblast-specific marker gene Osteopontin (Opn) was also increased in MC3T3-E1 cells cultured on MBG-L/G substrate. CONCLUSIONS We conclude that MBG-L/G is a potential biomaterial for the treatment of bone defect.
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Affiliation(s)
- Xiaoyan Wang
- Department of Biology and Chemistry, College of Liberal Arts and Sciences, National University of Defense Technology, Changsha, 410073, Hunan, People's Republic of China.
| | - Wei Chen
- Shaoyang No. 11 Middle School, Shaoyang, 422000, Hunan, People's Republic of China
| | - Qianqian Liu
- Department of Biochemistry, School of Life Sciences, Central South University, Changsha, 410013, Hunan, People's Republic of China
| | - Long Liu
- Department of Biology and Chemistry, College of Liberal Arts and Sciences, National University of Defense Technology, Changsha, 410073, Hunan, People's Republic of China
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179
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Abstract
The epigenetic modifications of histones are versatile marks that are intimately connected to development and disease pathogenesis including human cancers. In this review, we will discuss the many different types of histone modifications and the biological processes with which they are involved. Specifically, we review the enzymatic machineries and modifications that are involved in cancer development and progression, and how to apply currently available small molecule inhibitors for histone modifiers as tool compounds to study the functional significance of histone modifications and their clinical implications.
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Affiliation(s)
- Zibo Zhao
- Department of Biochemistry and Molecular Genetics, Northwestern University Feinberg School of Medicine, Simpson Querrey 7th Floor 303 E. Superior Street, Chicago, IL, 60611, USA.,Simpson Querrey Center for Epigenetics, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611, USA
| | - Ali Shilatifard
- Department of Biochemistry and Molecular Genetics, Northwestern University Feinberg School of Medicine, Simpson Querrey 7th Floor 303 E. Superior Street, Chicago, IL, 60611, USA. .,Simpson Querrey Center for Epigenetics, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611, USA.
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180
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Reshamwala R, Shah M, St John J, Ekberg J. Survival and Integration of Transplanted Olfactory Ensheathing Cells are Crucial for Spinal Cord Injury Repair: Insights from the Last 10 Years of Animal Model Studies. Cell Transplant 2019; 28:132S-159S. [PMID: 31726863 PMCID: PMC7016467 DOI: 10.1177/0963689719883823] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Olfactory ensheathing cells (OECs), the glial cells of the primary olfactory nervous system, support the natural regeneration of the olfactory nerve that occurs throughout life. OECs thus exhibit unique properties supporting neuronal survival and growth. Transplantation of OECs is emerging as a promising treatment for spinal cord injury; however, outcomes in both animals and humans are variable and the method needs improvement and standardization. A major reason for the discrepancy in functional outcomes is the variability in survival and integration of the transplanted cells, key factors for successful spinal cord regeneration. Here, we review the outcomes of OEC transplantation in rodent models over the last 10 years, with a focus on survival and integration of the transplanted cells. We identify the key factors influencing OEC survival: injury type, source of transplanted cells, co-transplantation with other cell types, number and concentration of cells, method of delivery, and time of transplantation after the injury. We found that two key issues are hampering optimization and standardization of OEC transplantation: lack of (1) reliable methods for identifying transplanted cells, and (2) three-dimensional systems for OEC delivery. To develop OEC transplantation as a successful and standardized therapy for spinal cord injury, we must address these issues and increase our understanding of the complex parameters influencing OEC survival.
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Affiliation(s)
- Ronak Reshamwala
- Griffith Institute for Drug Discovery, Griffith University, Brisbane, Queensland, Australia.,Menzies Health Institute Queensland, Griffith University, Southport, Queensland, Australia.,Clem Jones Centre for Neurobiology and Stem Cell Research, Griffith University, Brisbane, Queensland, Australia
| | - Megha Shah
- Menzies Health Institute Queensland, Griffith University, Southport, Queensland, Australia.,Clem Jones Centre for Neurobiology and Stem Cell Research, Griffith University, Brisbane, Queensland, Australia
| | - James St John
- Griffith Institute for Drug Discovery, Griffith University, Brisbane, Queensland, Australia.,Menzies Health Institute Queensland, Griffith University, Southport, Queensland, Australia.,Clem Jones Centre for Neurobiology and Stem Cell Research, Griffith University, Brisbane, Queensland, Australia
| | - Jenny Ekberg
- Griffith Institute for Drug Discovery, Griffith University, Brisbane, Queensland, Australia.,Menzies Health Institute Queensland, Griffith University, Southport, Queensland, Australia.,Clem Jones Centre for Neurobiology and Stem Cell Research, Griffith University, Brisbane, Queensland, Australia
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181
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Liao CF, Chen CC, Lu YW, Yao CH, Lin JH, Way TD, Yang TY, Chen YS. Effects of endogenous inflammation signals elicited by nerve growth factor, interferon-γ, and interleukin-4 on peripheral nerve regeneration. J Biol Eng 2019; 13:86. [PMID: 31754373 PMCID: PMC6854735 DOI: 10.1186/s13036-019-0216-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Accepted: 10/21/2019] [Indexed: 12/15/2022] Open
Abstract
Background Large gap healing is a difficult issue in the recovery of peripheral nerve injury. The present study provides in vivo trials of silicone rubber chambers filled with collagen containing IFN-γ or IL-4 to bridge a 15 mm sciatic nerve defect in rats. Fillings of NGF and normal saline were used as the positive and negative controls. Neuronal electrophysiology, neuronal connectivity, macrophage infiltration, location and expression levels of calcitonin gene-related peptide and histology of the regenerated nerves were evaluated. Results At the end of 6 weeks, animals from the groups of NGF and IL-4 had dramatic higher rates of successful regeneration (100 and 80%) across the wide gap as compared to the groups of IFN-γ and saline controls (30 and 40%). In addition, the NGF group had significantly higher NCV and shorter latency compared to IFN-γ group (P < 0.05). The IL-4 group recruited significantly more macrophages in the nerves as compared to the saline controls and the NGF-treated animals (P < 0.05). Conclusions The current study demonstrated that NGF and IL-4 show potential growth-promoting capability for peripheral nerve regeneration. These fillings in the bridging conduits may modulate local inflammatory conditions affecting recovery of the nerves.
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Affiliation(s)
- Chien-Fu Liao
- 1Department of Biological Science and Technology, China Medical University, Taichung, Taiwan
| | - Chung-Chia Chen
- Linsen Chinese Medicine and Kunming Branch, Taipei City Hospital, Taipei, Taiwan
| | - Yu-Wen Lu
- 3Department of Chinese Medicine, Show Chwan Memorial Hospital, Chunaghua, Taiwan.,4Department of Chinese Medicine, Chang Bing Show Chwan Memorial Hospital, Changhua, Taiwan
| | - Chun-Hsu Yao
- 5Lab of Biomaterials, School of Chinese Medicine, China Medical University , Taichung, Taiwan.,6Biomaterials Translational Research Center, China Medical University Hospital, Taichung, Taiwan.,7Department of Bioinformatics and Medical Engineering, Asia University, Taichung, Taiwan
| | - Jia-Horng Lin
- 8Department of Fiber and Composite Materials, Feng Chia University, Taichung, Taiwan
| | - Tzong-Der Way
- 1Department of Biological Science and Technology, China Medical University, Taichung, Taiwan
| | - Tse-Yen Yang
- 9Department of Medical Research, China Medical University Hospital, Taichung, Taiwan.,10Center for General Education & Master Program of Digital Health Innovation, China Medical University, Taichung, Taiwan
| | - Yueh-Sheng Chen
- 5Lab of Biomaterials, School of Chinese Medicine, China Medical University , Taichung, Taiwan.,6Biomaterials Translational Research Center, China Medical University Hospital, Taichung, Taiwan.,7Department of Bioinformatics and Medical Engineering, Asia University, Taichung, Taiwan.,10Center for General Education & Master Program of Digital Health Innovation, China Medical University, Taichung, Taiwan.,11College of Humanities and Sciences, China Medical University, Taichung, Taiwan
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182
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Valencia-Gómez LE, Martel-Estrada SA, Vargas-Requena CL, Acevedo-Fernández JJ, Rodríguez-González CA, Hernández-Paz JF, Santos-Rodríguez E, Olivas-Armendáriz I. Characterization and evaluation of a novel O-carboxymethyl chitosan films with Mimosa tenuiflora extract for skin regeneration and wound healing. J BIOACT COMPAT POL 2019. [DOI: 10.1177/0883911519885976] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
In this study, films of O-carboxymethyl chitosan with Mimosa tenuiflora extract were manufactured, characterized, and evaluated. In this work, both the synthesis of O-carboxymethyl chitosan and the extraction of the active ingredient of Mimosa tenuiflora extract from the cortex are described. First, the extract of Mimosa tenuiflora in water was obtained by precipitation with ethanol, filtering, and concentrating. Subsequently, a study was conducted of scratch wound healing to determine the optimal concentration of extract to be used in the manufacture of films. The produced O-carboxymethyl chitosan films and the Mimosa tenuiflora extract were mixed, and their chemical composition, tensile properties, and wettability were characterized by Fourier-transform infrared spectroscopy, mechanical tests, and contact angle measurement. The antimicrobial properties of the films were tested by turbidimetry using two types of bacteria. In addition, a study of the enzymatic degradation of the films with the enzyme lysozyme was performed. Finally, in vitro studies to assess the biocompatibility and cytotoxicity of films with fibroblastic cells were carried out as well as the kinetic analysis of healing in mice. It was found that the addition of Mimosa tenuiflora extract in the polymer matrix of the films made with O-carboxymethyl chitosan improves the proliferation of fibroblast and accelerates wound healing, thus providing a novel biomaterial for skin regeneration.
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Affiliation(s)
| | | | | | | | | | | | | | - Imelda Olivas-Armendáriz
- Instituto de Ingeniería y Tecnología, Universidad Autónoma de Ciudad Juárez, Ciudad Juárez, México
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183
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Hsu PL, Shi H, Leonen C, Kang J, Chatterjee C, Zheng N. Structural Basis of H2B Ubiquitination-Dependent H3K4 Methylation by COMPASS. Mol Cell 2019; 76:712-723.e4. [PMID: 31733991 DOI: 10.1016/j.molcel.2019.10.013] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 10/03/2019] [Accepted: 10/10/2019] [Indexed: 12/20/2022]
Abstract
The COMPASS (complex of proteins associated with Set1) complex represents the prototype of the SET1/MLL family of methyltransferases that controls gene transcription by H3K4 methylation (H3K4me). Although H2B monoubiquitination (H2Bub) is well known as a prerequisite histone mark for COMPASS activity, how H2Bub activates COMPASS remains unclear. Here, we report the cryoelectron microscopy (cryo-EM) structures of an extended COMPASS catalytic module (CM) bound to the H2Bub and free nucleosome. The COMPASS CM clamps onto the nucleosome disk-face via an extensive interface to capture the flexible H3 N-terminal tail. The interface also sandwiches a critical Set1 arginine-rich motif (ARM) that autoinhibits COMPASS. Unexpectedly, without enhancing COMPASS-nucleosome interaction, H2Bub activates the enzymatic assembly by packing against Swd1 and alleviating the inhibitory effect of the Set1 ARM upon fastening it to the acidic patch. By delineating the spatial configuration of the COMPASS-H2Bub-nucleosome assembly, our studies establish the structural framework for understanding the long-studied H2Bub-H3K4me histone modification crosstalk.
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Affiliation(s)
- Peter L Hsu
- Department of Pharmacology, Box 357280, University of Washington, Seattle, WA 98195, USA; Howard Hughes Medical Institute, University of Washington, Seattle, WA 98195, USA
| | - Hui Shi
- Department of Pharmacology, Box 357280, University of Washington, Seattle, WA 98195, USA; Howard Hughes Medical Institute, University of Washington, Seattle, WA 98195, USA
| | - Calvin Leonen
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA
| | - Jianming Kang
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA
| | - Champak Chatterjee
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA.
| | - Ning Zheng
- Department of Pharmacology, Box 357280, University of Washington, Seattle, WA 98195, USA; Howard Hughes Medical Institute, University of Washington, Seattle, WA 98195, USA.
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184
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Hissae Yassue-Cordeiro P, Zandonai CH, Pereira Genesi B, Santos Lopes P, Sanchez-Lopez E, Garcia ML, Camargo Fernandes-Machado NR, Severino P, B Souto E, Ferreira da Silva C. Development of Chitosan/Silver Sulfadiazine/Zeolite Composite Films for Wound Dressing. Pharmaceutics 2019; 11:pharmaceutics11100535. [PMID: 31615120 PMCID: PMC6835377 DOI: 10.3390/pharmaceutics11100535] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 10/05/2019] [Accepted: 10/07/2019] [Indexed: 01/05/2023] Open
Abstract
Biopolymeric films with silver sulfadiazine (AgSD) are proposed as an alternative to the occlusive AgSD-containing creams and gauzes, which are commonly used in the treatment of conventional burns. While the recognized cytotoxicity of AgSD has been reported to compromise its use as an antimicrobial drug in pharmaceuticals, this limitation can be overcome by developing sustained-release formulations. Microporous materials as zeolites can be used as drug delivery systems for sustained release of AgSD. The purpose of this work was the development and characterization of chitosan/zeolite composite films to be used as wound dressings. Zeolite was impregnated with AgSD before the production of the composite films. The physicochemical properties of zeolites and the films were evaluated, as well as the antimicrobial activity of the polymeric films and the cytotoxicity of the films in fibroblasts Balb 3T3/c. Impregnated zeolite exhibited changes in FTIR spectra and XRD diffraction patterns, in comparison to non-impregnated composites, which corroborate the results obtained with EDX-SEM. The pure chitosan film was compact and without noticeable defects and macropores, while the film with zeolite was opaquer, more rigid, and efficient against Candida albicans and some gram-negative bacteria. The safety evaluation showed that although the AgSD films present cytotoxicity, they could be used in a concentration-dependent fashion.
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Affiliation(s)
- Patricia Hissae Yassue-Cordeiro
- Department of Chemical Engineering, Universidade Tecnológica Federal do Paraná, Av. dos Pioneiros, 3131, Jardim Morumbi, Londrina-PR 86036-370, Brazil.
| | - Cássio Henrique Zandonai
- Department of Chemical Engineering, Universidade Estadual de Maringá, Av. Colombo 5790 Bloco D-90, Maringá 87020-900, Brazil.
| | - Bianca Pereira Genesi
- Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, Rua São Nicolau 210, Diadema 09913-030, Brazil.
| | - Patrícia Santos Lopes
- Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, Rua São Nicolau 210, Diadema 09913-030, Brazil.
| | - Elena Sanchez-Lopez
- Department of Pharmacy, Pharmaceutical Technology and Physical Chemistry, Faculty of Pharmacy and Food Sciences, University of Barcelona, Av. Joan XXIII 27-31, 08028 Barcelona, Spain.
- Institute of Nanoscience and nanotechnology (IN2UB). Faculty of Pharmacy, University of Barcelona, 08028 Barcelona, Spain.
- CIBERNED Centros de Biomedicina en Red de Enfermedades Neurodegenerativas, Facultat de Farmàcia, Universitat de Barcelona, 08028 Barcelona, Spain.
| | - Maria Luisa Garcia
- Department of Pharmacy, Pharmaceutical Technology and Physical Chemistry, Faculty of Pharmacy and Food Sciences, University of Barcelona, Av. Joan XXIII 27-31, 08028 Barcelona, Spain.
- Institute of Nanoscience and nanotechnology (IN2UB). Faculty of Pharmacy, University of Barcelona, 08028 Barcelona, Spain.
- CIBERNED Centros de Biomedicina en Red de Enfermedades Neurodegenerativas, Facultat de Farmàcia, Universitat de Barcelona, 08028 Barcelona, Spain.
| | | | - Patrícia Severino
- Instituto de Tecnologia e Pesquisa, Universidade Tiradentes, Aracaju, Brazil.
- Tiradentes Institute, 150 Mt Vernon St, Dorchester, MA 02125, USA.
| | - Eliana B Souto
- Faculdade de Farmácia, Universidade de Coimbra, Pólo das Ciências da Saúde, Azinhaga de Santa Comba, 3000-548 Coimbra, Portugal.
- CEB-Centro de Engenharia Biológica, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
| | - Classius Ferreira da Silva
- Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, Rua São Nicolau 210, Diadema 09913-030, Brazil.
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185
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Williams DF. Specifications for Innovative, Enabling Biomaterials Based on the Principles of Biocompatibility Mechanisms. Front Bioeng Biotechnol 2019; 7:255. [PMID: 31649926 PMCID: PMC6794428 DOI: 10.3389/fbioe.2019.00255] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Accepted: 09/23/2019] [Indexed: 12/17/2022] Open
Abstract
In any engineering discipline, whenever products are designed, manufactured and ultimately utilized for the benefits of society, a series of specifications for the product are defined, and maybe refined, in order that they perform as effectively as possible, with due attention being paid to the safety, and economic aspects. These specifications are established with respect to all of the relevant properties, including those determined by mechanical, physical, chemical, manufacturing and environmental conditions, and the resulting design and materials selection reflects the optimal balance. In areas of medical technology, these specifications should be based on both functionality, which determines whether a device can actually perform as intended, and biocompatibility, which determines how the device interacts, both acutely and chronically, with the body. Unfortunately, whilst so much progress has been made with the development of superior functionality for the treatment and diagnosis of so many disease states, this is not the same for biocompatibility, where the single most-important currently adopted specification is that the device should do no harm, which falls far short of the ideal requirement. This paper addresses the profound need for biomaterials specifications to be based on the mechanisms of biocompatibility.
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Affiliation(s)
- David F. Williams
- Wake Forest Institute of Regenerative Medicine, Winston-Salem, NC, United States
- Strait Access Technologies, Cape Town, South Africa
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186
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Aziz SB, Abdulwahid RT, Hamsan MH, Brza MA, Abdullah RM, Kadir MFZ, Muzakir SK. Structural, Impedance, and EDLC Characteristics of Proton Conducting Chitosan-Based Polymer Blend Electrolytes with High Electrochemical Stability. Molecules 2019; 24:molecules24193508. [PMID: 31569650 PMCID: PMC6803927 DOI: 10.3390/molecules24193508] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 09/22/2019] [Accepted: 09/24/2019] [Indexed: 11/30/2022] Open
Abstract
In this report, a facile solution casting technique was used to fabricate polymer blend electrolytes of chitosan (CS):poly (ethylene oxide) (PEO):NH4SCN with high electrochemical stability (2.43V). Fourier transform infrared (FTIR) spectroscopy was used to investigate the polymer electrolyte formation. For the electrochemical property analysis, cyclic voltammetry (CV), linear sweep voltammetry (LSV), and electrochemical impedance spectroscopy (EIS) techniques were carried out. Referring to the FTIR spectra, a complex formation between the added salt and CS:PEO was deduced by considering the decreasing and shifting of FTIR bands intensity in terms of functional groups. The CS:PEO:NH4SCN electrolyte was found to be electrochemically stable as the applied voltage linearly swept up to 2.43V. The cyclic voltammogram has presented a wide potential window without showing any sign of redox peaks on the electrode surface. The proved mechanisms of charge storage in these fabricated systems were found to be double layer charging. The EIS analysis showed the existence of bulk resistance, wherein the semicircle diameter decreased with increasing salt concentration. The calculated maximum DC conductivity value was observed to be 2.11 × 10−4 S/cm for CS:PEO incorporated with 40 wt% of NH4SCN salt. The charged species in CS:PEO:NH4SCN electrolytes were considered to be predominantly ionic in nature. This was verified from transference number analysis (TNM), in which ion and electron transference numbers were found to be tion = 0.954 and tel = 0.045, respectively. The results obtained for both ion transference number and DC conductivity implied the possibility of fabricating electrolytes for electrochemical double layer capacitor (EDLC) device application. The specific capacitance of the fabricated EDLC was obtained from the area under the curve of the CV plot.
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Affiliation(s)
- Shujahadeen B Aziz
- Advanced Polymeric Materials Research Lab., Department of Physics, College of Science, University of Sulaimani, Qlyasan Street, Kurdistan Regional Government, Sulaimani 46001, Iraq.
- Komar Research Center (KRC), Komar University of Science and Technology, Kurdistan Regional Government, Sulaimani 46001, Iraq.
| | - Rebar T Abdulwahid
- Advanced Polymeric Materials Research Lab., Department of Physics, College of Science, University of Sulaimani, Qlyasan Street, Kurdistan Regional Government, Sulaimani 46001, Iraq.
- Department of Physics, College of Education, University of Sulaimani, Old Campus, Kurdistan Regional Government, Sulaimani 46001, Iraq.
| | - Muhamad H Hamsan
- Institute for Advanced Studies, University of Malaya, Kuala Lumpur 50603, Gombak, Malaysia.
| | - Mohamad A Brza
- Advanced Polymeric Materials Research Lab., Department of Physics, College of Science, University of Sulaimani, Qlyasan Street, Kurdistan Regional Government, Sulaimani 46001, Iraq.
- Manufacturing and Materials Engineering Department, Faculty of Engineering, International Islamic University of Malaysia, Kuala Lumpur 50603, Gombak, Malaysia.
| | - Ranjdar M Abdullah
- Advanced Polymeric Materials Research Lab., Department of Physics, College of Science, University of Sulaimani, Qlyasan Street, Kurdistan Regional Government, Sulaimani 46001, Iraq.
| | - Mohd F Z Kadir
- Centre for Foundation Studies in Science, University of Malaya, Kuala Lumpur 50603, Gombak, Malaysia.
| | - Saifful K Muzakir
- Material Technology Program, Faculty of Industrial Sciences & Technology, Universiti Malaysia Pahang, Lebuhraya Tun Razak, Gambang, Kuantan 43600, Pahang, Malaysia.
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187
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Lalzawmliana V, Anand A, Roy M, Kundu B, Nandi SK. Mesoporous bioactive glasses for bone healing and biomolecules delivery. Mater Sci Eng C Mater Biol Appl 2020; 106:110180. [PMID: 31753410 DOI: 10.1016/j.msec.2019.110180] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 08/22/2019] [Accepted: 09/09/2019] [Indexed: 01/17/2023]
Abstract
Impact of bone diseases and injury is increasing at an enormous rate during the past decades due to increase in road traffic accidents and other injuries. Bioactive glasses have excellent biocompatibility and osteoconductivity that makes it suitable for bone regeneration. Researches and studies conducted on several bioactive glasses gives an insight on the need of multi-disciplinary approaches involving various scientific fields to attain its full potential. Of late, a next generation bioactive glass called as mesoporous bioactive glass (MBG) has been developed with higher specific surface area and control over mesoporous structure that presents a new material for bone regeneration. A brief discussion and overview on the potential use of MBG as a suitable material for bone tissue regeneration and biomolecule delivery is included. Additionally, possible control of the structural and functional property based on composition and fabrication techniques are also covered. According to recent researches, MBG-implant interaction with bone forming cells for cellular growth and differentiation as well as its effect on delivery of growth factor, both in vitro and in vivo, are optimistic; yet, the complete efficacy of this material is still to be explored. Hence, in this article we will review the current development and its applications for bone tissue engineering (TE).
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188
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Kašpárková V, Jasenská D, Capáková Z, Maráková N, Stejskal J, Bober P, Lehocký M, Humpolíček P. Polyaniline colloids stabilized with bioactive polysaccharides: Non-cytotoxic antibacterial materials. Carbohydr Polym 2019; 219:423-430. [DOI: 10.1016/j.carbpol.2019.05.038] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 02/27/2019] [Accepted: 05/10/2019] [Indexed: 01/11/2023]
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189
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Liu Y, Zong S, Li J. Carboxymethyl chitosan perturbs inflammation profile and colonic microbiota balance in mice. J Food Drug Anal 2019; 28:175-182. [PMID: 31883606 DOI: 10.1016/j.jfda.2019.07.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2019] [Revised: 07/03/2019] [Accepted: 07/30/2019] [Indexed: 12/22/2022] Open
Abstract
Carboxymethyl chitosan (CMC) is widely used in food and medicine as a biodegradable polymer. However, its effects on inflammation profile and colon health are not well investigated. In the present study, CMC was given to mice to evaluate its possible effects on body weight, blood glucose level, inflammation factors, intestinal permeability and colon microbiota. Results showed that blood glucose level of CMC treated mice was relatively higher than control ones. Glucose tolerance test revealed that CMC treated mice presented higher peak glucose level and lower lag level. CMC treatment increased serum LDL-c level, decreased serum HDL-c and IL-10 level in the fat tissue. Moreover, CMC treatment downregulated the expression of tight junction protein, occludin and ZO-1, in colon as evaluated by Western blot. Colon microbiota analysis demonstrated that CMC treatment significantly decreased the OTUs and relative species abundance. The level of Enterobacteriaceae, Lachnospiraceae and several other bacteria were much higher in the colon content of CMC treated mice. The results collectively suggest that CMC treatment induces disturbance of glucose and fat metabolism, affects the inflammation profile, perturbs colon microbiota balance.
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Affiliation(s)
- Yuting Liu
- School of Food and Biological Engineering, Hefei University of Technology, Hefei 230009, China
| | - Shuai Zong
- School of Food and Biological Engineering, Hefei University of Technology, Hefei 230009, China
| | - Jinglei Li
- School of Food and Biological Engineering, Hefei University of Technology, Hefei 230009, China.
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190
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Cheng Y, Hu Z, Zhao Y, Zou Z, Lu S, Zhang B, Li S. Sponges of Carboxymethyl Chitosan Grafted with Collagen Peptides for Wound Healing. Int J Mol Sci 2019; 20:E3890. [PMID: 31404991 DOI: 10.3390/ijms20163890] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Revised: 08/07/2019] [Accepted: 08/07/2019] [Indexed: 11/19/2022] Open
Abstract
Burns are physically debilitating and potentially fatal injuries. Two marine biomaterials, carboxymethyl chitosan (CMC) and collagen peptides (COP), have emerged as promising burn dressings. In this paper, sponges of carboxymethyl chitosan grafted with collagen peptide (CMC–COP) were prepared by covalent coupling and freeze drying. Scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy were then used to characterize the prepared sponges. To evaluate the wound healing activity of the CMC–COP sponges, in vitro tests including cell viability scratch wound healing and scald wound healing experiments were performed in rabbits. Appearance studies revealed the porous nature of sponges and FTIR spectroscopy demonstrated the successful incorporation of COP into CMC. The in vitro scratch assay showed that treatment with CMC–COP sponges (at 100 μg/mL) had significant effects on scratch closure. For burn wounds treated with CMC–COP, regeneration of the epidermis and collagen fiber deposition was observed on day 7, with complete healing of the epidermis and wound on days 14 and 21, respectively. Based on the pathological examination by hematoxylin and eosinstaining, the CMC–COP group demonstrated pronounced wound healing efficiencies. These results confirmed that the CMC–COP treatment enhanced cell migration and promoted skin regeneration, thereby highlighting the potential application of these sponges in burn care.
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191
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Yang C, Dan N, You W, Huang Y, Chen Y, Yu G, Dan W, Wen H. Modification of collagen-chitosan membrane by oxidation sodium alginate and in vivo/ in vitro evaluation for wound dressing application. International Journal of Polymer Analysis and Characterization 2019. [DOI: 10.1080/1023666x.2019.1648637] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Changkai Yang
- Key Laboratory for Leather Chemistry and Engineering of the Education Ministry, Sichuan University, Chengdu, Sichuan, P. R. China
| | - Nianhua Dan
- Key Laboratory for Leather Chemistry and Engineering of the Education Ministry, Sichuan University, Chengdu, Sichuan, P. R. China
- Research Center of Biomedical Engineering, Sichuan University, Chengdu, Sichuan, P. R. China
| | - Weiting You
- Key Laboratory for Leather Chemistry and Engineering of the Education Ministry, Sichuan University, Chengdu, Sichuan, P. R. China
| | - Yanping Huang
- Key Laboratory for Leather Chemistry and Engineering of the Education Ministry, Sichuan University, Chengdu, Sichuan, P. R. China
| | - Yining Chen
- Key Laboratory for Leather Chemistry and Engineering of the Education Ministry, Sichuan University, Chengdu, Sichuan, P. R. China
| | - Guofei Yu
- Key Laboratory for Leather Chemistry and Engineering of the Education Ministry, Sichuan University, Chengdu, Sichuan, P. R. China
| | - Weihua Dan
- Key Laboratory for Leather Chemistry and Engineering of the Education Ministry, Sichuan University, Chengdu, Sichuan, P. R. China
- Research Center of Biomedical Engineering, Sichuan University, Chengdu, Sichuan, P. R. China
| | - Huitao Wen
- Key Laboratory for Leather Chemistry and Engineering of the Education Ministry, Sichuan University, Chengdu, Sichuan, P. R. China
- Fujian Key Laboratory of Green Design and Manufacture of Leather, Xingye Leather Technology Co., Ltd, Jinjiang, Fujian, P. R. China
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192
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Reyna-urrutia VA, Mata-haro V, Cauich-rodriguez JV, Herrera-kao WA, Cervantes-uc JM. Effect of two crosslinking methods on the physicochemical and biological properties of the collagen-chitosan scaffolds. Eur Polym J 2019; 117:424-33. [DOI: 10.1016/j.eurpolymj.2019.05.010] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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193
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Ren L, Xu J, Zhang Y, Zhou J, Chen D, Chang Z. Preparation and characterization of porous chitosan microspheres and adsorption performance for hexavalent chromium. Int J Biol Macromol 2019; 135:898-906. [DOI: 10.1016/j.ijbiomac.2019.06.007] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 05/30/2019] [Accepted: 06/02/2019] [Indexed: 11/16/2022]
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194
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de la Vega L, Lee C, Sharma R, Amereh M, Willerth SM. 3D bioprinting models of neural tissues: The current state of the field and future directions. Brain Res Bull 2019; 150:240-249. [DOI: 10.1016/j.brainresbull.2019.06.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2018] [Revised: 05/30/2019] [Accepted: 06/06/2019] [Indexed: 01/01/2023]
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195
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Hoveizi E, Tavakol S, Shirian S, Sanamiri K. Electrospun Nanofibers for Diabetes: Tissue Engineering and Cell-Based Therapies. Curr Stem Cell Res Ther 2019; 14:152-168. [PMID: 30338744 DOI: 10.2174/1574888x13666181018150107] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 03/11/2018] [Accepted: 09/05/2018] [Indexed: 02/08/2023]
Abstract
Diabetes mellitus is an autoimmune disease which causes loss of insulin secretion producing hyperglycemia by promoting progressive destruction of pancreatic β cells. An ideal therapeutic approach to manage diabetes mellitus is pancreatic β cells replacement. The aim of this review article was to evaluate the role of nanofibrous scaffolds and stem cells in the treatment of diabetes mellitus. Various studies have pointed out that application of electrospun biomaterials has considerably attracted researchers in the field of tissue engineering. The principles of cell therapy for diabetes have been reviewed in the first part of this article, while the usability of tissue engineering as a new therapeutic approach is discussed in the second part.
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Affiliation(s)
- Elham Hoveizi
- Department of Biology, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran.,Stem Cells and Transgenic Technology Research Center (STTRC), Shahid Chamran University of Ahvaz, Ahvaz, Iran
| | - Shima Tavakol
- Cellular and Molecular Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Sadegh Shirian
- Department of Pathology, School of Veterinary Medicine, Shahrekord University, Shahrekord, Iran.,Shiraz Molecular Research Center, Dr. Daneshbod Pathology Lab, Shiraz, Iran
| | - Khadije Sanamiri
- Department of Animal Biology, Faculty of Biological Sciences, Kharazmi University, Tehran, Iran
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196
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Pereira Dos Santos E, Nicácio PHM, Coêlho Barbosa F, Nunes da Silva H, Andrade ALS, Lia Fook MV, de Lima Silva SM, Farias Leite I. Chitosan/Essential Oils Formulations for Potential Use as Wound Dressing: Physical and Antimicrobial Properties. Materials (Basel) 2019; 12:E2223. [PMID: 31295876 PMCID: PMC6678229 DOI: 10.3390/ma12142223] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [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: 04/26/2019] [Revised: 05/17/2019] [Accepted: 05/21/2019] [Indexed: 12/22/2022]
Abstract
Film-forming emulsions and films, prepared by incorporating different concentrations of clove essential oil (CEO) and melaleuca essential oil (MEO) into chitosan (CS) were obtained and their properties were evaluated. Film-forming emulsions were characterized in terms of qualitative assessment, hydrogen potential and in vitro antibacterial activity, that was carried by the agar diffusion method, and the growth inhibition effects were tested on the Gram-positive microorganism of Staphylococcus aureus, Gram-negative microorganisms of Escherichia coli, and against isolated fungi such as Candida albicans. In order to study the impact of the incorporation of CEO and MEO into the CS matrix, the appearance and thickness of the films were evaluated. Furthermore, Fourier transform infrared spectroscopy (FTIR), contact angle measurements, a swelling test, scanning electron microscopy and a tensile test were carried out. Results showed that the film-forming emulsions had translucent aspect with cloudy milky appearance and showed antimicrobial properties. The CEO had the highest inhibition against the three strains studied. As regards the films' properties, the coloration of the films was affected by the type and concentration of bioactive used. The chitosan/CEO films showed an intense yellowish coloration while the chitosan/MEO films presented a slightly yellowish coloration, but in general, all chitosan/EOs films presented good transparency in visible light besides flexibility, mechanical resistance when touched, smaller thicknesses than the dermis and higher wettability than chitosan films, in both distilled water and phosphate-buffered saline (PBS). The interactions between the chitosan and EOs were confirmed by. The chitosan/EOs films presented morphologies with rough appearance and with EOs droplets in varying shapes and sizes, well distributed along the surface of the films, and the tensile properties were compatible to be applied as wound dressings. These results revealed that the CEO and MEO have a good potential to be incorporated into chitosan to make films for wound-healing applications.
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Affiliation(s)
| | | | - Francivandi Coêlho Barbosa
- Materials Engineering Department, Federal University of Campina Grande, Campina Grande PB 58429-140, Brazil
| | - Henrique Nunes da Silva
- Materials Engineering Department, Federal University of Campina Grande, Campina Grande PB 58429-140, Brazil
| | - André Luís Simões Andrade
- Materials Engineering Department, Federal University of Campina Grande, Campina Grande PB 58429-140, Brazil
| | - Marcus Vinícius Lia Fook
- Materials Engineering Department, Federal University of Campina Grande, Campina Grande PB 58429-140, Brazil
| | | | - Itamara Farias Leite
- Materials Engineering Department, Federal University of Paraíba, João Pessoa PB 58051-900, Brazil.
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197
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Wu C, Sun J, Lu Y, Wu T, Pang J, Hu Y. In situ self-assembly chitosan/ε-polylysine bionanocomposite film with enhanced antimicrobial properties for food packaging. Int J Biol Macromol 2019; 132:385-392. [DOI: 10.1016/j.ijbiomac.2019.03.133] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 03/12/2019] [Accepted: 03/20/2019] [Indexed: 11/17/2022]
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198
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Franceschini G. Internal surgical use of biodegradable carbohydrate polymers. Warning for a conscious and proper use of oxidized regenerated cellulose. Carbohydr Polym 2019; 216:213-6. [DOI: 10.1016/j.carbpol.2019.04.036] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 04/07/2019] [Accepted: 04/08/2019] [Indexed: 11/19/2022]
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199
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Annamalai RT, Hong X, Schott NG, Tiruchinapally G, Levi B, Stegemann JP. Injectable osteogenic microtissues containing mesenchymal stromal cells conformally fill and repair critical-size defects. Biomaterials 2019; 208:32-44. [PMID: 30991216 PMCID: PMC6500486 DOI: 10.1016/j.biomaterials.2019.04.001] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [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: 11/14/2018] [Revised: 03/28/2019] [Accepted: 04/01/2019] [Indexed: 12/18/2022]
Abstract
Repair of complex fractures with bone loss requires a potent, space-filling intervention to promote regeneration of bone. We present a biomaterials-based strategy combining mesenchymal stromal cells (MSC) with a chitosan-collagen matrix to form modular microtissues designed for delivery through a needle to conformally fill cavital defects. Implantation of microtissues into a calvarial defect in the mouse showed that osteogenically pre-differentiated MSC resulted in complete bridging of the cavity, while undifferentiated MSC produced mineralized tissue only in apposition to native bone. Decreasing the implant volume reduced bone regeneration, while increasing the MSC concentration also attenuated bone formation, suggesting that the cell-matrix ratio is important in achieving a robust response. Conformal filling of the defect with microtissues in a carrier gel resulted in complete healing. Taken together, these results show that modular microtissues can be used to augment the differentiated function of MSC and provide an extracellular environment that potentiates bone repair.
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Affiliation(s)
- Ramkumar T Annamalai
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, United States
| | - Xiaowei Hong
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, United States
| | - Nicholas G Schott
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, United States
| | | | - Benjamin Levi
- Department of Surgery, University of Michigan, Ann Arbor, United States
| | - Jan P Stegemann
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, United States.
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Wei X, Zhou H, Chen F, Wang G. Bending Flexibility of Moso Bamboo ( Phyllostachys Edulis) with Functionally Graded Structure. Materials (Basel) 2019; 12:ma12122007. [PMID: 31234566 PMCID: PMC6631585 DOI: 10.3390/ma12122007] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 06/19/2019] [Accepted: 06/21/2019] [Indexed: 11/16/2022]
Abstract
As one of the most renewable and sustainable resources on Earth, bamboo with its high flexibility has been used in the fabrication of a wide variety of composite structures due to its properties. A bamboo-based winding composite (BWC) is an innovative bamboo product which has revolutionized pipe structures and their applications throughout China as well as improving their impact on the environment. However, as a natural functionally graded composite, the flexibility mechanism of bamboo has not yet been fully understood. Here, the bending stiffness method based on the cantilever beam principle was used to investigate the gradient and directional bending flexibility of bamboo (Phyllostachys edulis) slivers under different loading Types during elastic stages. Results showed that the graded distribution and gradient variation of cell size of the fibers embedded in the parenchyma cells along the thickness of the bamboo culm was mainly responsible for the exhibited gradient bending flexibility of bamboo slivers, whereas the shape and size difference of the vascular bundles from inner to outer layers played a critical role in directional bending flexibility. A validated rule of mixture was used to fit the bending stiffness under different loading Types as a function of fiber volume fraction. This work provides insights to the bionic preparation and optimization of high-performance BWC pipes.
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Affiliation(s)
- Xin Wei
- International Centre for Bamboo and Rattan, Beijing 100102, China.
- National Forestry and Grassland Administration/Beijing Co-build Key Laboratory of Bamboo and Rattan Science & Technology, Beijing 100102, China.
| | - Haiying Zhou
- International Centre for Bamboo and Rattan, Beijing 100102, China.
- National Forestry and Grassland Administration/Beijing Co-build Key Laboratory of Bamboo and Rattan Science & Technology, Beijing 100102, China.
| | - Fuming Chen
- International Centre for Bamboo and Rattan, Beijing 100102, China.
| | - Ge Wang
- International Centre for Bamboo and Rattan, Beijing 100102, China.
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