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Chemical Modification of Silk Fibroin through Serine Amino Acid Residues. MATERIALS 2022; 15:ma15134399. [PMID: 35806524 PMCID: PMC9267670 DOI: 10.3390/ma15134399] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 06/15/2022] [Accepted: 06/19/2022] [Indexed: 12/12/2022]
Abstract
Silk fibroin (SF) is a natural protein polymer and promising biomaterial. Chemical modifications have attracted growing interest in expanding SF applications. However, the majority of amino acid residues in SF are non-reactive and most of the reactive ones are in the crystalline region. Herein, a modification was conducted to investigate the possibility of direct modification on the surface of natural SF by a reagent with a mild reactivity, the type and quantity of the residues involved in the reactions, and the structural changes upon modification. Infrared spectrum, 1H NMR, titration and amino acid analyses, X-ray diffraction, and hemolysis test were used to analyze the materials. The results showed that sulfonic acid groups were grafted onto SF and the reaction occurred mainly at serine residues through hydroxyl groups. In total, 0.0958 mmol/g of residues participated in the modification with a modification efficiency of 7.6%. Moreover, the crystallinity and the content of β-sheet structure in SF increased upon modification. The modified material had good blood-compatibility. In conclusion, surface modification on native SF through serine residues was practicable and had the advantage of increased β-sheet structure. This will provide an alternative way for the modification of fibroin for the desired application in the biomedical field.
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Zheng M, Guo J, Li Q, Yang J, Han Y, Yang H, Yu M, Zhong L, Lu D, Li L, Sun L. Syntheses and characterization of anti-thrombotic and anti-oxidative Gastrodin-modified polyurethane for vascular tissue engineering. Bioact Mater 2021; 6:404-419. [PMID: 32995669 PMCID: PMC7486448 DOI: 10.1016/j.bioactmat.2020.08.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 08/12/2020] [Accepted: 08/12/2020] [Indexed: 12/15/2022] Open
Abstract
Vascular grafts must avoid negative inflammatory responses and thrombogenesis to prohibit fibrotic deposition immediately upon implantation and promote the regeneration of small diameter blood vessels (<6 mm inner diameter). Here, polyurethane (PU) elastomers incorporating anti-coagulative and anti-inflammatory Gastrodin were fabricated. The films had inter-connected pores with porosities equal to or greater than 86% and pore sizes ranging from 250 to 400 μm. Incorporation of Gastrodin into PU films resulted in desirable mechanical properties, hydrophilicity, swelling ratios and degradation rates without collapse. The released Gastrodin maintained bioactivity over 21 days as assessed by its anti-oxidative capability. The Gastrodin/PU had better anti-coagulation response (less observable BSA, fibrinogen and platelet adhesion/activation and suppressed clotting in whole blood). Red blood cell compatibility, measured by hemolysis, was greatly improved with 2Gastrodin/PU compared to other Gastrodin/PU groups. Notably, Gastrodin/PU upregulated anti-oxidant factors Nrf2 and HO-1 expression in H2O2 treated HUVECs, correlated with decreasing pro-inflammatory cytokines TNF-α and IL-1β in RAW 264.7 cells. Upon implantation in a subcutaneous pocket, PU was encapsulated by an obvious fibrous capsule, concurrent with a large amount of inflammatory cell infiltration, while Gastrodin/PU induced a thinner fibrous capsule, especially 2Gastrodin/PU. Further, enhanced adhesion and proliferation of HUVECs seeded onto films in vitro demonstrated that 2Gastrodin/PU could help cell recruitment, as evidenced by rapid host cell infiltration and substantial blood vessel formation in vivo. These results indicate that 2Gastrodin/PU has the potential to facilitate blood vessel regeneration, thus providing new insight into the development of clinically effective vascular grafts.
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Affiliation(s)
- Meng Zheng
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Science and Technology Achievement Incubation Center, Kunming Medical University, Kunming, 650500, China
| | - Jiazhi Guo
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Science and Technology Achievement Incubation Center, Kunming Medical University, Kunming, 650500, China
| | - Qing Li
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Science and Technology Achievement Incubation Center, Kunming Medical University, Kunming, 650500, China
| | - Jian Yang
- Department of Biomedical Engineering, Materials Research Institute, The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, 16802, USA
| | - Yi Han
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Science and Technology Achievement Incubation Center, Kunming Medical University, Kunming, 650500, China
| | - Hongcai Yang
- Department of Neurology, The First Affiliated Hospital, Kunming Medical University, Kunming, 650500, China
| | - Mali Yu
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Science and Technology Achievement Incubation Center, Kunming Medical University, Kunming, 650500, China
| | - Lianmei Zhong
- Department of Neurology, The First Affiliated Hospital, Kunming Medical University, Kunming, 650500, China
| | - Di Lu
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Science and Technology Achievement Incubation Center, Kunming Medical University, Kunming, 650500, China
| | - Limei Li
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Science and Technology Achievement Incubation Center, Kunming Medical University, Kunming, 650500, China
| | - Lin Sun
- Department of Cardiology, The Second Affiliated Hospital, Kunming Medical University, Kunming, 650032, China
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Liu L, Hu X, Feng Z, Zhang X, Wang S, Xu S, Sun K. Prediction of acid radical ion binding residues by K-nearest neighbors classifier. BMC Mol Cell Biol 2019; 20:52. [PMID: 31823720 PMCID: PMC6904995 DOI: 10.1186/s12860-019-0238-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Background Proteins perform their functions by interacting with acid radical ions. Recently, it was a challenging work to precisely predict the binding residues of acid radical ion ligands in the research field of molecular drug design. Results In this study, we proposed an improved method to predict the acid radical ion binding residues by using K-nearest Neighbors classifier. Meanwhile, we constructed datasets of four acid radical ion ligand (NO2−, CO32−, SO42−, PO43−) binding residues from BioLip database. Then, based on the optimal window length for each acid radical ion ligand, we refined composition information and position conservative information and extracted them as feature parameters for K-nearest Neighbors classifier. In the results of 5-fold cross-validation, the Matthew’s correlation coefficient was higher than 0.45, the values of accuracy, sensitivity and specificity were all higher than 69.2%, and the false positive rate was lower than 30.8%. Further, we also performed an independent test to test the practicability of the proposed method. In the obtained results, the sensitivity was higher than 40.9%, the values of accuracy and specificity were higher than 84.2%, the Matthew’s correlation coefficient was higher than 0.116, and the false positive rate was lower than 15.4%. Finally, we identified binding residues of the six metal ion ligands. In the predicted results, the values of accuracy, sensitivity and specificity were all higher than 77.6%, the Matthew’s correlation coefficient was higher than 0.6, and the false positive rate was lower than 19.6%. Conclusions Taken together, the good results of our prediction method added new insights in the prediction of the binding residues of acid radical ion ligands.
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Affiliation(s)
| | - Xiuzhen Hu
- College of Sciences, Inner Mongolia University of Technology, Hohhot, 010051, China.
| | - Zhenxing Feng
- College of Sciences, Inner Mongolia University of Technology, Hohhot, 010051, China
| | - Xiaojin Zhang
- College of Sciences, Inner Mongolia University of Technology, Hohhot, 010051, China
| | - Shan Wang
- College of Sciences, Inner Mongolia University of Technology, Hohhot, 010051, China
| | - Shuang Xu
- College of Sciences, Inner Mongolia University of Technology, Hohhot, 010051, China
| | - Kai Sun
- College of Sciences, Inner Mongolia University of Technology, Hohhot, 010051, China
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Ma K, Rozet S, Tamada Y, Yao J, Ni QQ. Multi-layer nanofibrous tubes with dual drug-release profiles for vascular graft engineering. J Drug Deliv Sci Technol 2019. [DOI: 10.1016/j.jddst.2019.01.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Tu F, Liu Y, Li H, Shi P, Hao Y, Wu Y, Yi H, Yin Y, Wang J. Vascular Cell Co-Culture on Silk Fibroin Matrix. Polymers (Basel) 2018; 10:E39. [PMID: 30966074 PMCID: PMC6414862 DOI: 10.3390/polym10010039] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 11/13/2017] [Accepted: 11/15/2017] [Indexed: 01/21/2023] Open
Abstract
Silk fibroin (SF), a natural polymer material possessing excellent biocompatibility and biodegradability, and has been widely used in biomedical applications. In order to explore the behavior of vascular cells by co-culturing on regenerated SF matrix for use as artificial blood vessels, human aorta vascular smooth muscle cells (HAVSMCs) were co-cultured with human arterial fibroblasts (HAFs) or human umbilical vein endothelial cells (HUVECs) on SF films and SF tubular scaffolds (SFTSs). Analysis of cell morphology and deoxyribonucleic acid (DNA) content showed that HUVECs, HAVSMCs and HAFs adhered and spread well, and exhibited high proliferative activity whether cultured alone or in co-culture. Immunofluorescence and scanning electron microscopy (SEM) analysis showed that HUVECs and HAFs co-existed well with HAVSMCs on SF films or SFTSs. Cytokine expression determined by reverse transcription-polymerase chain reaction (RT-PCR) indicated that the expression levels of α-smooth muscle actin (α-SMA) and smooth muscle myosin heavy chain (SM-MHC) in HAVSMCs were inhibited on SF films or SFTSs, but expression could be obviously promoted by co-culture with HUVECs or HAFs, especially that of SM-MHC. On SF films, the expression of vascular endothelial growth factor (VEGF) and platelet endothelial cell adhesion molecule-1 (CD31) in HUVECs was promoted, and the expression levels of both increased obviously when co-cultured with HAVSMCs, with the expression levels of VEGF increasing with increasing incubation time. The expression levels of VEGF and CD31 in cells co-cultured on SFTSs improved significantly from day 3 compared with the mono-culture group. These results were beneficial to the mechanism analysis on vascular cell colonization and vascular tissue repair after in vivo transplantation of SFTSs.
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Affiliation(s)
- Fangfang Tu
- College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, Jiangsu, China.
| | - Yunfei Liu
- College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, Jiangsu, China.
| | - Helei Li
- College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, Jiangsu, China.
| | - Pange Shi
- College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, Jiangsu, China.
| | - Yunxia Hao
- College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, Jiangsu, China.
| | - Yue Wu
- College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, Jiangsu, China.
| | - Honggen Yi
- National Engineering Laboratory for Modern Silk, Soochow University, Suzhou 215123, Jiangsu, China.
| | - Yin Yin
- Laboratory Animal Research Center, Soochow University, Suzhou 215123, Jiangsu, China.
| | - Jiannan Wang
- College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, Jiangsu, China.
- National Engineering Laboratory for Modern Silk, Soochow University, Suzhou 215123, Jiangsu, China.
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Shen G, Hu X, Guan G, Wang L. Surface Modification and Characterisation of Silk Fibroin Fabric Produced by the Layer-by-Layer Self-Assembly of Multilayer Alginate/Regenerated Silk Fibroin. PLoS One 2015; 10:e0124811. [PMID: 25919690 PMCID: PMC4412632 DOI: 10.1371/journal.pone.0124811] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Accepted: 03/17/2015] [Indexed: 02/05/2023] Open
Abstract
Silk-based medical products have a long history of use as a material for surgical sutures because of their desirable mechanical properties. However, silk fibroin fabric has been reported to be haemolytic when in direct contact with blood. The layer-by-layer self-assembly technique provides a method for surface modification to improve the biocompatibility of silk fibroin fabrics. Regenerated silk fibroin and alginate, which have excellent biocompatibility and low immunogenicity, are outstanding candidates for polyelectrolyte deposition. In this study, silk fabric was degummed and positively charged to create a silk fibroin fabric that could undergo self-assembly. The multilayer self-assembly of the silk fibroin fabric was achieved by alternating the polyelectrolyte deposition of a negatively charged alginate solution (pH = 8) and a positively charged regenerated silk fibroin solution (pH = 2). Finally, the negatively charged regenerated silk fibroin solution (pH = 8) was used to assemble the outermost layer of the fabric so that the surface would be negatively charged. A stable structural transition was induced using 75% ethanol. The thickness and morphology were characterised using atomic force microscopy. The properties of the self-assembled silk fibroin fabric, such as the bursting strength, thermal stability and flushing stability, indicated that the fabric was stable. In addition, the cytocompatibility and haemocompatibility of the self-assembled silk fibroin fabrics were evaluated. The results indicated that the biocompatibility of the self-assembled multilayers was acceptable and that it improved markedly. In particular, after the self-assembly, the fabric was able to prevent platelet adhesion. Furthermore, other non-haemolytic biomaterials can be created through self-assembly of more than 1.5 bilayers, and we propose that self-assembled silk fibroin fabric may be an attractive candidate for anticoagulation applications and for promoting endothelial cell adhesion for vascular prostheses.
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Affiliation(s)
- Gaotian Shen
- Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai 201620, China
| | - Xingyou Hu
- Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai 201620, China
| | - Guoping Guan
- Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai 201620, China
- Engineering Research Center of Technical Textiles, Ministry of Education, Shanghai 201620, China
| | - Lu Wang
- Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai 201620, China
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Sun D, Hao Y, Yang G, Wang J. Hemocompatibility and cytocompatibility of the hirudin‐modified silk fibroin. J Biomed Mater Res B Appl Biomater 2014; 103:556-62. [DOI: 10.1002/jbm.b.33241] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Revised: 05/24/2014] [Accepted: 06/01/2014] [Indexed: 11/07/2022]
Affiliation(s)
- Dan Sun
- National Engineering Laboratory for Modern SilkSoochow University, Suzhou, People's Republic of ChinaCollege of Textile and Clothing EngineeringSoochow UniversitySuzhou People's Republic of China
- College of Light Industry and TextileQiqihar UniversityQiqihar People's Republic of China
| | - Yunxia Hao
- National Engineering Laboratory for Modern SilkSoochow University, Suzhou, People's Republic of ChinaCollege of Textile and Clothing EngineeringSoochow UniversitySuzhou People's Republic of China
| | - Gaoqiang Yang
- National Engineering Laboratory for Modern SilkSoochow University, Suzhou, People's Republic of ChinaCollege of Textile and Clothing EngineeringSoochow UniversitySuzhou People's Republic of China
| | - Jiannan Wang
- National Engineering Laboratory for Modern SilkSoochow University, Suzhou, People's Republic of ChinaCollege of Textile and Clothing EngineeringSoochow UniversitySuzhou People's Republic of China
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8
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Elahi MF, Guan G, Wang L, King MW. Improved hemocompatibility of silk fibroin fabric using layer-by-layer polyelectrolyte deposition and heparin immobilization. J Appl Polym Sci 2014. [DOI: 10.1002/app.40772] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- M. Fazley Elahi
- Key Laboratory of Textile Science and Technology; Ministry of Education, College of Textiles, Donghua University; Songjiang District Shanghai 201620 China
| | - Guoping Guan
- Key Laboratory of Textile Science and Technology; Ministry of Education, College of Textiles, Donghua University; Songjiang District Shanghai 201620 China
| | - Lu Wang
- Key Laboratory of Textile Science and Technology; Ministry of Education, College of Textiles, Donghua University; Songjiang District Shanghai 201620 China
| | - Martin W. King
- Key Laboratory of Textile Science and Technology; Ministry of Education, College of Textiles, Donghua University; Songjiang District Shanghai 201620 China
- College of Textiles, North Carolina State University; Raleigh North Carolina 27695-8301
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9
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Elahi MF, Guan G, Wang L, King MW. Influence of Layer-by-Layer Polyelectrolyte Deposition and EDC/NHS Activated Heparin Immobilization onto Silk Fibroin Fabric. MATERIALS 2014; 7:2956-2977. [PMID: 28788601 PMCID: PMC5453351 DOI: 10.3390/ma7042956] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/02/2014] [Revised: 03/25/2014] [Accepted: 03/31/2014] [Indexed: 01/07/2023]
Abstract
To enhance the hemocompatibility of silk fibroin fabric as biomedical material, polyelectrolytes architectures have been assembled through the layer-by-layer (LbL) technique on silk fibroin fabric (SFF). In particular, 1.5 and 2.5 bilayer of oppositely charged polyelectrolytes were assembled onto SFF using poly(allylamine hydrochloride) (PAH) as polycationic polymer and poly(acrylic acid) (PAA) as polyanionic polymer with PAH topmost. Low molecular weight heparin (LMWH) activated with 1-ethyl-3-(dimethylaminopropyl) carbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS) was then immobilized on its surface. Alcian Blue staining, toluidine blue assay and X-ray photoelectron spectroscopy (XPS) confirmed the presence of heparin on modified SFF surfaces. The surface morphology of the modified silk fibroin fabric surfaces was characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM), and obtained increased roughness. Negligible hemolytic effect and a higher concentration of free hemoglobin by a kinetic clotting time test ensured the improved biological performance of the modified fibroin fabric. Overall, the deposition of 2.5 bilayer was found effective in terms of biological and surface properties of the modified fibroin fabric compared to 1.5 bilayer self-assembly technique. Therefore, this novel approach to surface modification may demonstrate long term patency in future in vivo animal trials of small diameter silk fibroin vascular grafts.
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Affiliation(s)
- M Fazley Elahi
- Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai 201620, China.
| | - Guoping Guan
- Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai 201620, China.
| | - Lu Wang
- Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai 201620, China.
| | - Martin W King
- Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai 201620, China.
- College of Textiles, North Carolina State University, Raleigh, NC 27695-8301, USA.
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Li J, Nie S, Wang L, Sun S, Ran F, Zhao C. One-pot synthesized poly(vinyl pyrrolidone- co-methyl methacrylate- co-acrylic acid) blended with poly(ether sulfone) to prepare blood-compatible membranes. J Appl Polym Sci 2013. [DOI: 10.1002/app.39463] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Jie Li
- State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials; Lanzhou University of Technology; Lanzhou; 730050; People's Republic of China
| | - Shengqiang Nie
- College of Polymer Science and Engineering; State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu; 610065; People's Republic of China
| | - Lingren Wang
- College of Polymer Science and Engineering; State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu; 610065; People's Republic of China
| | - Shudong Sun
- College of Polymer Science and Engineering; State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu; 610065; People's Republic of China
| | | | - Changsheng Zhao
- College of Polymer Science and Engineering; State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu; 610065; People's Republic of China
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11
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Ran F, Nie S, Yin Z, Li J, Su B, Sun S, Zhao C. Synthesized negatively charged macromolecules (NCMs) for the surface modification of anticoagulant membrane biomaterials. Int J Biol Macromol 2013; 55:269-75. [DOI: 10.1016/j.ijbiomac.2013.01.014] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2012] [Revised: 09/23/2012] [Accepted: 01/14/2013] [Indexed: 10/27/2022]
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12
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Tamada Y, Sano M, Niwa K, Imai T, Yoshino G. Sulfation of silk sericin and anticoagulant activity of sulfated sericin. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 15:971-80. [PMID: 15461184 DOI: 10.1163/1568562041526469] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Silk sericin extracted from a cocoon was sulfated by chlorosulfonic acid. Sulfation of sericin was confirmed by FT-IR and the reaction efficiency was calculated as 44.9%. 1H-NMR suggested that sulfation mainly occurred at serine residues in the sericin molecule. The sulfated sericin was separated in three fractions by gel-filtration chromatography using Sephacryl S-200. The sulfate group content and amino-acid composition of each fraction were almost identical, while the anticoagulant activity differed for each fraction of sulfated sericin. Higher anticoagulant activity was observed for the higher-molecular-mass fraction. The anticoagulant activity of sulfated sericin was estimated at 1/10 to 1/20 of heparin.
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Affiliation(s)
- Yasushi Tamada
- National Institute of Agrobiological Sciences, 1-2 Owashi, Tsukuba, Ibaraki 305-8634, Japan.
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13
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Tao Y, Xu W, Yan Y, Cao Y. Preparation and characterization of silk fibroin nanocrystals. POLYM INT 2012. [DOI: 10.1002/pi.4136] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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14
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Liu H, Li X, Niu X, Zhou G, Li P, Fan Y. Improved Hemocompatibility and Endothelialization of Vascular Grafts by Covalent Immobilization of Sulfated Silk Fibroin on Poly(lactic-co-glycolic acid) Scaffolds. Biomacromolecules 2011; 12:2914-24. [DOI: 10.1021/bm200479f] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Haifeng Liu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, People’s Republic of China
| | - Xiaoming Li
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, People’s Republic of China
| | - Xufeng Niu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, People’s Republic of China
| | - Gang Zhou
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, People’s Republic of China
| | - Ping Li
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, People’s Republic of China
| | - Yubo Fan
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, People’s Republic of China
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15
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Liu H, Li X, Zhou G, Fan H, Fan Y. Electrospun sulfated silk fibroin nanofibrous scaffolds for vascular tissue engineering. Biomaterials 2011; 32:3784-93. [DOI: 10.1016/j.biomaterials.2011.02.002] [Citation(s) in RCA: 136] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2010] [Accepted: 02/01/2011] [Indexed: 10/18/2022]
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16
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Seyrek E, Dubin P. Glycosaminoglycans as polyelectrolytes. Adv Colloid Interface Sci 2010; 158:119-29. [PMID: 20444439 DOI: 10.1016/j.cis.2010.03.001] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2009] [Revised: 02/27/2010] [Accepted: 03/03/2010] [Indexed: 02/02/2023]
Abstract
One of the barriers to understanding structure-property relations for glycosaminoglycans has been the lack of constructive interplay between the principles and methodologies of the life sciences (molecular biology, biochemistry and cell biology) and the physical sciences, particularly in the field of polyelectrolytes. To address this, we first review the similarities and differences between the physicochemical properties of GAGs and other statistical chain polyelectrolytes of both natural and abioitic origin. Since the biofunctionality and regulation of the structures of GAGs is intimately connected with interactions with their cognate proteins, we particularly compare and contrast aspects of protein binding, i.e. effects of both GAGs and other polyelectrolytes on protein stability, protein aggregation and phase behavior. The protein binding affinities and their dependences on pH and ionic strength for the two groups are discussed not only in terms of observable differences, but also with regard to contrasting descriptions of the bound state and the role of electrostatics. We conclude that early studies of the heparin-Antithromin system, proceeding to a large extent through the methods and models of protein chemistry and drug discovery, established not only many enabling precedents but also constraining paradigms. Current studies on heparan sulfate and chondroitin sulfate seem to reflect a more ecumenical view likely to be more compatible with concepts from physical and polymer chemistry.
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Affiliation(s)
- Emek Seyrek
- CNRS, Insitut Charles Sadron, 23 Rue Loess, BP 84047, F-67037 Strasbourg 2, France
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18
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Monti P, Freddi G, Arosio C, Tsukada M, Arai T, Taddei P. Vibrational spectroscopic study of sulphated silk proteins. J Mol Struct 2007. [DOI: 10.1016/j.molstruc.2006.11.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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19
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Taddei P, Arosio C, Monti P, Tsukada M, Arai T, Freddi G. Chemical and physical properties of sulfated silk fabrics. Biomacromolecules 2007; 8:1200-8. [PMID: 17338562 DOI: 10.1021/bm061017y] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Silk fabrics were treated with chlorosulphonic acid in pyridine for different times. The amount of sulfur bound to silk increased during the first 2 h of reaction and then reached a plateau. The amino acidic pattern of sulfated silk remained essentially unchanged for short reaction times (< or =2 h). Longer reaction times resulted in drastic changes in the concentration of Asp, Glu, and Tyr. Surface morphology and texture of silk fabrics changed upon sulfation. Warp and weft yarns became progressively thinner, and deposits of foreign material appeared on the fiber surface. Changes were more evident at longer reaction times (> or =2 h). Spectroscopic analyses performed by FT-IR and FT-Raman showed the appearance of new bands attributable to various vibrations of sulfated groups. The IR bands at 1049 and 1014 cm-1, due to organic sulfate salts, were particularly intense. Bands assigned to alkyl sulfates and sulfonamides appeared in the 1300-1180 cm-1 range. Organic covalent sulfates displayed a weak but distinct IR band at 1385 cm-1. Both IR and Raman spectra revealed that silk fibroin mainly bound sulfates through the hydroxyl groups of Ser and Tyr, while involvement of amines could not be proved. Changes observed in the amide I and II range indicated an increase of the degree of molecular disorder of sulfated silk. Accordingly, the I850/I830 intensity ratio between the two Tyr bands at 850-830 cm-1 increased from 1.41 to 1.52, indicating a more exposed state of Tyr residues in sulfated silk. TGA, DSC, and TG analyses showed that sulfated silk attained a higher thermal stability. A thermal transition attributable to sulfated silk fibroin fractions appeared at about 260 degrees C in the DSC thermograms.
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Affiliation(s)
- P Taddei
- Centro di Studio sulla Spettroscopia Raman, Dipartimento di Biochimica G. Moruzzi, Università di Bologna, via Belmeloro 8/2, Bologna 40126, Italy
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Li Q, He D, Chen W, Ni L. Preparation, Characterization and Anticoagulant Activity of Guar Gum Sulphate. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2005. [DOI: 10.1081/ma-200065936] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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