



@article {3311,
	title = {The effect of hyaluronan-based delivery of stromal cell-derived factor-1 on the recruitment of MSCs in degenerating intervertebral discs},
	journal = {Biomaterials},
	volume = {35},
	year = {2014},
	note = {Export Date: 21 November 2014},
	month = {2014},
	pages = {8144 - 8153},
	abstract = {Intervertebral disc (IVD) degeneration is the leading cause of low back pain and disability in the active population. Transplantation of mesenchymal stem cells (MSCs) in a hydrogel carrier can induce regenerative effects in degenerated IVDs. Moreover, it was found that degenerative discs release chemoattractants effective in MSC recruitment. Based on these findings, we hypothesized that an injectable hydrogel that can enhance the number of migrated MSCs in the IVD and provide a suitable matrix for their survival and differentiation would be ideal. The purpose of this study was to evaluate the potential of a thermoreversible hyaluronan-poly(N-isopropylacrylamide) (HAP) hydrogel as chemoattractant delivery system to recruit human MSCs in degenerative IVDs. The results demonstrate that HAP hydrogels containing stromal cell derived factor-1 (SDF-1) significantly increased the number of MSCs migrating into nucleotomized discs compared with discs treated with only HAP or SDF-1 in solution. HAP hydrogels releasing SDF-1 enhanced both the number of recruited cells and their migration distance in the IVD tissue. Furthermore, this phenomenon was dependent on MSC donor age. In conclusion, HAP SDF-1 is effective for the recruitment of stem cells in the IVD, thus opening new possibilities for the development of regenerative therapies based on endogenous cell migration. {\textcopyright} 2014 Elsevier Ltd.},
	keywords = {Intervertebral disc, Mesenchymal Stem Cells, Recruitment, Stromal cell derived factor-1, Thermoreversible hyaluronan hydrogel},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84903746142\&partnerID=40\&md5=1366ab2e3399d0a363aab2e356bbdf96},
	author = {Pereira, C.L. and Gon{\c c}alves, R.M. and Peroglio, M. and Pattappa, G. and D{\textquoteright}Este, M. and Eglin, D. and Barbosa, M.A. and Alini, M. and Grad, S.}
}
@article {2203,
	title = {Biosynthesis of highly pure poly-γ-glutamic acid for biomedical applications},
	journal = {Journal of Materials Science: Materials in MedicineJ. Mater. Sci. Mater. Med.},
	volume = {23},
	year = {2012},
	note = {Export Date: 21 November 2012Source: ScopusCODEN: JSMMEdoi: 10.1007/s10856-012-4639-xPubMed ID: 22532096Language of Original Document: EnglishCorrespondence Address: Pereira, C.L.; INEB-Instituto de Engenharia Biom{\'e}dica, Universidade Do Porto, Rua do Campo Alegre, 823, 4150-180 Porto, Portugal; email: Catarina.pereira@ineb.up.ptChemicals/CAS: chitosan, 9012-76-4; glutamic acid, 11070-68-1, 138-15-8, 56-86-0, 6899-05-4; polyglutamic acid, 24991-23-9, 25513-46-6; Biocompatible Materials; Polyglutamic Acid, 25513-46-6; poly(gamma-glutamic acid)References: Ratner, B.D., Hoffman, A.S., Shoen, F.J., Lemons, J.E., (2004) Natural Materials. Biomaterials Science-an Introduction to Materials in Medicine, , 2nd ed. San Diego, CA: Academic Press;Buescher, J.M., Margaritis, A., Microbial biosynthesis of polyglutamic acid biopolymer and applications in the biopharmaceutical, biomedical and food industries (2007) Critical Reviews in Biotechnology, 27 (1), pp. 1-19. , DOI 10.1080/07388550601166458, PII 773236840; 
Kang, H.-S., Park, S.-H., Lee, Y.-G., Son, T.-I., Polyelectrolyte complex hydrogel composed of chitosan and poly(γ-glutamic acid) for biological application: Preparation, physical properties, and cytocompatibility (2007) Journal of Applied Polymer Science, 103 (1), pp. 386-394. , DOI 10.1002/app.24623; 
Lin, Y.-H., Chung, C.-K., Chen, C.-T., Liang, H.-F., Chen, S.-C., Sung, H.-W., Preparation of nanoparticles composed of chitosan/poly-γ-glutamic acid and evaluation of their permeability through Caco-2 cells (2005) Biomacromolecules, 6 (2), pp. 1104-1112. , DOI 10.1021/bm049312a; 
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Ashiuchi, M., Shimanouchi, K., Nakamura, H., Kamei, T., Soda, K., Park, C., Sung, M.-H., Misono, H., Enzymatic synthesis of high-molecular-mass poly-γ-glutamate and regulation of its stereochemistry (2004) Applied and Environmental Microbiology, 70 (7), pp. 4249-4255. , DOI 10.1128/AEM.70.7.4249-4255.2004; 
Shih, I.-L., Van, Y.-T., The production of poly-(γ-glutamic acid) from microorganisms and its various applications (2001) Bioresource Technology, 79 (3), pp. 207-225. , DOI 10.1016/S0960-8524(01)00074-8, PII S0960852401000748; 
Prodhomme, E.J.F., Tutt, A.L., Glennie, M.J., Bugg, T.D.H., Multivalent Conjugates of Poly-γ-D-glutamic Acid from Bacillus licheniformis with Antibody F(ab{\textquoteright}) and Glycopeptide Ligands (2003) Bioconjugate Chemistry, 14 (6), pp. 1148-1155. , DOI 10.1021/bc020019m; 
Schneerson, R., Kubler-Kielb, J., Liu, T.-Y., Dai, Z.-D., Leppla, S.H., Yergey, A., Backlund, P., Robbins, J.B., Poly(γ-D-glutamic acid) protein conjugates induce IgG antibodies in mice to the capsule of Bacillus anthracis: A potential addition to the anthrax vaccine (2003) Proceedings of the National Academy of Sciences of the United States of America, 100 (15), pp. 8945-8950. , DOI 10.1073/pnas.1633512100; 
Edde, B., Rossier, J., Le Caer, J., Desbruyeres, E., Gros, F., Denoulet, P., Posttranslational glutamylation of alpha-tubulin (1990) Science, 247 (4938), pp. 83-85; 
Sung, M.-H., Park, C., Kim, C.-J., Poo, H., Soda, K., Ashiuchi, M., Natural and edible biopolymer poly-γ-glutamic acid: Synthesis, production, and applications (2005) Chemical Record, 5 (6), pp. 352-366. , DOI 10.1002/tcr.20061; 
Kunioka, M., Biosynthesis and chemical reactions of poly(amino acid)s from microorganisms (1997) Applied Microbiology and Biotechnology, 47 (5), pp. 469-475. , DOI 10.1007/s002530050958; 
Ashiuchi, M., Soda, K., Misono, H., A poly-γ-glutamate synthetic system of Bacillus subtilis IFO 3336: Gene cloning and biochemical analysis of poly-γ-glutamate produced by Escherichia coli clone cells (1999) Biochemical and Biophysical Research Communications, 263 (1), pp. 6-12. , DOI 10.1006/bbrc.1999.1298; 
Park, C., Choi, J.-C., Choi, Y.-H., Nakamura, H., Shimanouchi, K., Horiuchi, T., Misono, H., Sung, M.-H., Synthesis of super-high-molecular-weight poly-γ-glutamic acid by Bacillus subtilis subsp. chungkookjang (2005) Journal of Molecular Catalysis B: Enzymatic, 35 (4-6), pp. 128-133. , DOI 10.1016/j.molcatb.2005.06.007; 
Goto, A., Kunioka, M., Biosynthesis and hydrolysis of poly (c-glutamic acid) from Bacillus subtilis IFO3335 (1992) Biosci Biotechnol Biochem, 56 (7), pp. 1031-1035; 
Kubota, H., Matsunobu, T., Uotani, K., Takebe, H., Satoh, A., Tanaka, T., Production of poly(c-glutamic acid) by Bacillus subtilis F-2-01 (1993) Biosci Biotechnol Biochem, 57 (7), pp. 1212-1213; 
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Hsieh, C.-Y., Tsai, S.-P., Wang, D.-M., Chang, Y.-N., Hsieh, H.-J., Preparation of γ-PGA/chitosan composite tissue engineering matrices (2005) Biomaterials, 26 (28), pp. 5617-5623. , DOI 10.1016/j.biomaterials.2005.02.012, PII S0142961205001614; 
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Peng, S.-F., Yang, M.-J., Su, C.-J., Chen, H.-J., Lee, P.-W., Wei, M.-C., Effects of incorporation of poly(gamma-glutamic acid) in chitosan/DNA complex nanoparticles on cellular uptake and transfection efficiency (2009) Biomaterials, 30, pp. 1797-1808; 
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Hajdu, I., Bodn{\'a}r, M., Filipcsei, G., Hartmann, J., Dar{\'o}czi, L., Zr{\'\i}nyi, M., Nanoparticles prepared by self-assembly of Chitosan and poly-γ-glutamic acid (2008) Colloid Polym Sci, 286 (3), pp. 343-350; 
Keresztessy, Z., Bodn{\'a}r, M., Ber, E., Hajdu, I., Zhang, M., Hartmann, J., Self-assembling chitosan/poly-γ-glutamic acid nanoparticles for targeted drug delivery (2009) Colloid Polym Sci, 287 (7), pp. 759-765; 
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},
	month = {2012///},
	pages = {1583 - 1591},
	abstract = {The remarkable properties of poly-aminoacids, mainly their biocompatibility and biodegradability, have prompted an increasing interest in these polymers for biomedical applications. Poly-γ-glutamic acid (γ-PGA) is one of the most interesting poly-aminoacids with potential applications as a biomaterial. Here we describe the production and characterization of γ-PGA by Bacillus subtilis natto. The γ-PGA was produced with low molecular weight (10-50 kDa), high purity grade (>99 \%) and a D-/L-glutamate ratio of 50-60/50-40 \%. To evaluate the feasibility of using this γ-PGA as a biomaterial, chitosan (Ch)/γ-PGA nanoparticles were prepared by the coacervation method at pH ranging from 3.0 to 5.0, with dimensions in the interval 214-221 nm with a poly-dispersion index of ca. 0.2. The high purity of γ-PGA produced by this method, which is firstly described here, renders this biopolymer suitable for biomedical applications. Moreover, the Ch/γ-PGA nanocomplexes developed in this investigation can be combined with biologically active substances for their delivery in the organism. The fact that the assembly between Ch and γ-PGA relies on electrostatic interactions enables addition of other molecules that can be released into the medium through changes from acidic to physiological pH, without loss in biological activity. {\textcopyright} Springer Science+Business Media, LLC 2012.},
	keywords = {Amino acids, animal cell, article, Bacillus subtilis, Bacillus subtilis natto, Bioactivity, Biocompatibility, Biocompatible Materials, biodegradability, Biodegradable polymers, Biodegradation, Biologically active substances, biomaterial, Biomedical applications, biomedicine, biosynthesis, chitosan, circular dichroism, complex formation, controlled study, dispersion, Electrophoresis, Polyacrylamide Gel, feasibility study, Functional polymers, gamma polyglutamic acid, Glutamic acid, High purity, Low molecular weight, Medical applications, molecular interaction, molecular weight, Nanocomplexes, nanoparticle, nonhuman, pH, Physiological pH, polyglutamic acid, Potential applications, priority journal, purification, Spectroscopy, Fourier Transform Infrared, static electricity, Stereoisomerism, unclassified drug},
	isbn = {09574530 (ISSN)},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84863314791\&partnerID=40\&md5=d0d618bb2684c8e80e984cfe35f3eb77},
	author = {Pereira, C.L. and Antunes, J.C. and Gon{\c c}alves, R.M. and Ferreira-da-Silva, F. and Barbosa, M.A.}
}
@article {2215,
	title = {Layer-by-layer self-assembly of chitosan and poly(γ-glutamic acid) into polyelectrolyte complexes},
	journal = {BiomacromoleculesBiomacromolecules},
	volume = {12},
	year = {2011},
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},
	month = {2011///},
	pages = {4183 - 4195},
	abstract = {Chitosan (Ch) is a nontoxic and biocompatible polysaccharide extensively used in biomedical applications. Ch, as a polycation, can be combined with anionic polymers by layer-bylayer (LbL) self-assembly, giving rise to multilayered complexed architectures. These structures can be used in tissue engineering strategies, as drug delivery systems, or artificial matrices mimicking the extracellular microenvironment. In this work, Ch was combined with poly(γ-glutamic acid) (γ-PGA). γ-PGA is a polyanion, which was microbially produced, and is known for its low immunogenic reaction and low cytotoxicity. Multilayered ultrathin films were assembled by LbL, with a maximum of six layers. The interaction between both polymers was analyzed by: ellipsometry, quartz crystal microbalance with dissipation, Fourier transform infrared spectroscopy, atomic force microscopy, and zeta potential measurements. Ch/γ-PGA polyelectrolyte multilayers (PEMs) revealed no cytotoxicity according to ISO 10993-5. Overall, this study demonstrates that Ch can interact electrostatically with γ-PGA forming multilayered films. Furthermore, this study provides a comprehensive characterization of Ch/γ-PGA PEM structures, elucidating the contribution of each layer for the nanostructured films. These model surfaces can be useful substrates to study cell-biomaterial interactions in tissue regeneration. {\textcopyright} 2011 American Chemical Society.},
	keywords = {Amino acids, Anionic polymers, article, Atomic force microscopy, Atomic spectroscopy, Biocompatible Materials, Biocompatible polysaccharides, Biomaterials, Biomedical applications, Cell-biomaterial interactions, chemical interaction, chitosan, controlled study, Cytotoxicity, Drug delivery, drug delivery system, Drug Delivery Systems, Electrolytes, ellipsometry, enzyme activity, Extracellular, Fourier transform infrared spectroscopy, Glutamic acid, immunogenicity, infrared spectroscopy, Layer by layer self assembly, Medical applications, microenvironment, Microenvironments, Microscopy, Atomic Force, Model surface, Models, Molecular, Multi-layered, Multi-layered films, Multilayers, nanofilm, Nanostructured Films, polyanion, Polyanions, Polycations, polyelectrolyte, Polyelectrolyte complexes, Polyelectrolyte multilayer, Polyelectrolytes, Polyethylenes, polyglutamic acid, Polymers, priority journal, Programmed control systems, Quartz, quartz crystal microbalance, Quartz crystal microbalance with dissipation, Self assembly, Tissue, Tissue engineering, Tissue regeneration, Ultrathin films, Viscoelastic Substances, Zeta potential, Zeta potential measurements},
	isbn = {15257797 (ISSN)},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84856258191\&partnerID=40\&md5=8ba447b7a45e8004e5b3aa3d5cff2404},
	author = {Antunes, J.C. and Pereira, C.L. and Molinos, M. and Ferreira-da-Silva, F. and Dessi, M. and Gloria, A. and Ambrosio, L. and Gonca̧lves, R.M. and Barbosa, M.A.}
}
