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Lebleu C, Plet L, Moussy F, Gitton G, Da Costa Moreira R, Guduff L, Burlot B, Godiveau R, Merry A, Lecommandoux S, Errasti G, Philippe C, Delacroix T, Chakrabarti R. Improving aqueous solubility of paclitaxel with polysarcosine-b-poly(γ-benzyl glutamate) nanoparticles. Int J Pharm 2023; 631:122501. [PMID: 36529355 DOI: 10.1016/j.ijpharm.2022.122501] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Revised: 12/09/2022] [Accepted: 12/12/2022] [Indexed: 12/23/2022]
Abstract
New stealth amphiphilic copolymers based on polysarcosine (PSar) rather than poly(ethylene glycol) (PEG) have gained more attention for their use as excipients in nanomedicine. In this study, several polysarcosine-b-poly(γ-benzyl glutamate) (PSar-b-PGluOBn) block copolymers were synthesized by ring opening polymerization (ROP) of the respective N-carboxyanhydrides (NCAs) and were characterized by Fourier-transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance (1H NMR) and size-exclusion chromatography (SEC). Copolymers had different PGluOBn block configuration (racemic L/D, pure L or pure D), degrees of polymerization of PSar between 28 and 76 and PGluOBn between 9 and 93, molar masses (Mn) between 5.0 and 24.6 kg.mol-1 and dispersities (Đ) lower than 1.4. Nanoparticles of PSar-b-PGluOBn loaded with paclitaxel (PTX), a hydrophobic anti-cancer drug, were obtained by nanoprecipitation. Their hydrodynamic diameter (Dh) ranged from 27 to 118 nm with polydispersity indexes (PDI) between 0.01 and 0.20, as determined by dynamic light scattering (DLS). Their morphology was more spherical for copolymers with a racemic L/D PGluOBn block configuration synthesized at 5 °C. PTX loading efficiency was between 63 and 92 % and loading contents between 7 and 15 %. Using PSar-b-PGluOBn copolymers as excipients, PTX apparent water-solubility was significantly improved by a factor up to 6600 to 660 µg.mL-1.
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Affiliation(s)
- Coralie Lebleu
- PMC Isochem SAS, 32, rue Lavoisier F-91710, Vert-Le-Petit, France
| | - Laetitia Plet
- PMC Isochem SAS, 32, rue Lavoisier F-91710, Vert-Le-Petit, France
| | - Florène Moussy
- PMC Isochem SAS, 32, rue Lavoisier F-91710, Vert-Le-Petit, France
| | - Gaëtan Gitton
- PMC Isochem SAS, 32, rue Lavoisier F-91710, Vert-Le-Petit, France
| | | | - Ludmilla Guduff
- PMC Isochem SAS, 32, rue Lavoisier F-91710, Vert-Le-Petit, France
| | - Barbara Burlot
- PMC Isochem SAS, 32, rue Lavoisier F-91710, Vert-Le-Petit, France
| | | | - Aïnhoa Merry
- PMC Isochem SAS, 32, rue Lavoisier F-91710, Vert-Le-Petit, France
| | | | - Gauthier Errasti
- PMC Isochem SAS, 32, rue Lavoisier F-91710, Vert-Le-Petit, France
| | | | - Thomas Delacroix
- PMC Isochem SAS, 32, rue Lavoisier F-91710, Vert-Le-Petit, France
| | - Raj Chakrabarti
- PMC Isochem SAS, 32, rue Lavoisier F-91710, Vert-Le-Petit, France; Chakrabarti Advanced Technology, LLC, PMC Group Building, 1288 Route 73, Ste 110, Mount Laurel, NJ 08054, USA.
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Nemutlu E, Eroğlu İ, Eroğlu H, Kır S. In Vitro Release Test of Nano-drug Delivery Systems Based on Analytical and Technological Perspectives. CURR ANAL CHEM 2019. [DOI: 10.2174/1573411014666180912125931] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Background:Nanotech products are gaining more attention depending on their advantages for improving drug solubility, maintenance of drug targeting, and attenuation of drug toxicity. In vitro release test is the critical physical parameter to determine the pharmaceutical quality of the product, to monitor formulation design and batch-to-batch variation.Methods:Spectrophotometric and chromatographic methods are mostly used in quantification studies from in vitro release test of nano-drug delivery systems. These techniques have advantages and disadvantages with respect to each other considering dynamic range, selectivity, automation, compatibility with in vitro release media and cost per sample.Results:It is very important to determine the correct kinetic profile of active pharmaceutical substances. At this point, the analytical method used for in vitro release tests has become a very critical parameter to correctly assess the profiles. In this review, we provided an overview of analytical methods applied to the in vitro release assay of various nanopharmaceuticals.Conclusion:This review presents practical direction on analytical method selection for in vitro release test on nanopharmaceuticals. Moreover, precautions on analytical method selection, optimization and validation were discussed.
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Affiliation(s)
- Emirhan Nemutlu
- Department of Analytical Chemistry, Faculty of Pharmacy, Hacettepe University, 06100, Sıhhiye, Ankara, Turkey
| | - İpek Eroğlu
- Department of Basic Pharmaceutical Sciences, Faculty of Pharmacy, Hacettepe University, 06100, Sıhhiye, Ankara, Turkey
| | - Hakan Eroğlu
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Hacettepe University, 06100, Sıhhiye, Ankara, Turkey
| | - Sedef Kır
- Department of Analytical Chemistry, Faculty of Pharmacy, Hacettepe University, 06100, Sıhhiye, Ankara, Turkey
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Nazem H, Mohsenifar A, Majdi S. Chitosan-myristate nanogel as an artificial chaperone protects neuroserpin from misfolding. Adv Biomed Res 2016; 5:170. [PMID: 27995109 PMCID: PMC5137230 DOI: 10.4103/2277-9175.190942] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2014] [Accepted: 02/10/2015] [Indexed: 01/12/2023] Open
Abstract
Background: Molecular chaperon-like activity for protein refolding was studied using nanogel chitosan-myristic acid (CMA) and the protein neuroserpin (NS), a member of the serine proteinase inhibitor superfamily (serpin). Materials and Methods: Recombinant his-tag fusion NS was expressed in Escherichia coli. For confirmation of refolding of the purified NS, structural analysis was performed by circular dichroism and spectrofluorometric along with its inhibitory activity, which was assayed by single-chain tissue plasminogen activator. For evaluating NS aggregation during preparation, the samples were separated on a 7.5% (w/v) nondenaturing polyacrylamide gel electrophoresis. MA and chitosan covalently join together by the formation of amide linkages through the 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide-mediated reaction. The morphology and size of the prepared CM nanogel were characterized by transmission electron microscopy and scanning electron microscopy. Results: Heating at different temperatures (25°C, 37°C, 45°C, 65°C, 80°C) results in a further rise in β-structures accompanied by a fall of helices and no significant change in random coils. Structural changes in NS in the presence of CMA nanogel were less than that in the absence of CMA nanogel. Mater nanogel effectively prevented aggregation of NS during temperature induced protein refolding by the addition of cyclodextrins. The nanogel activity resembled the host-guest chaperon activity. Conclusion: These conditions, called conformational disorders, include Alzheimer's, Parkinson's, Huntington's disease, the transmissible spongiform encephalopathies, prion diseases, and dementia. Nanogels can be useful in recovery of the structural normality of proteins in these diseases.
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Affiliation(s)
- Habib Nazem
- Department of Biochemistry, Payam Noor University, Tehran, Iran
| | - Afshin Mohsenifar
- Department of Clinical Biochemistry, Tarbiat Modares University, Tehran, Iran
| | - Sahar Majdi
- Young Researchers and Elite Club, Tehran Medical Sciences Branch, Islamic Azad University, Tehran, Iran
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4
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Zagorodko O, Arroyo-Crespo JJ, Nebot VJ, Vicent MJ. Polypeptide-Based Conjugates as Therapeutics: Opportunities and Challenges. Macromol Biosci 2016; 17. [DOI: 10.1002/mabi.201600316] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 09/02/2016] [Indexed: 12/16/2022]
Affiliation(s)
- Oleksandr Zagorodko
- Polymer Therapeutics Laboratory; Centro de Investigación Príncipe Felipe; Valencia 46012 Spain
| | - Juan José Arroyo-Crespo
- Polymer Therapeutics Laboratory; Centro de Investigación Príncipe Felipe; Valencia 46012 Spain
| | - Vicent J. Nebot
- Polymer Therapeutics Laboratory; Centro de Investigación Príncipe Felipe; Valencia 46012 Spain
- Polypeptide Therapeutic Solutions SL; Centro de Investigación Príncipe Felipe; Valencia 46012 Spain
| | - María J. Vicent
- Polymer Therapeutics Laboratory; Centro de Investigación Príncipe Felipe; Valencia 46012 Spain
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5
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The orientational orders of poly(β-phenethyl l-aspartate) in two opposite α-helical form: a molecular dynamic simulation. MONATSHEFTE FUR CHEMIE 2016. [DOI: 10.1007/s00706-016-1828-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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6
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Fang J, Yong Q, Zhang K, Sun W, Yan S, Cui L, Yin J. Novel injectable porous poly(γ-benzyl-l-glutamate) microspheres for cartilage tissue engineering: preparation and evaluation. J Mater Chem B 2015; 3:1020-1031. [PMID: 32261981 DOI: 10.1039/c4tb01333f] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel injectable synthetic polypeptide of a poly(γ-benzyl-l-glutamate) macroporous microcarrier was developed for cartilage tissue engineering.
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Affiliation(s)
- Jianjun Fang
- Department of Polymer Materials
- Shanghai University
- Shanghai 200444
- China
| | - Qi Yong
- Medical Science & Research Center
- Beijing Shijitan Hospital
- Capital Medical University
- Beijing 100038
- P. R. China
| | - Kunxi Zhang
- Department of Polymer Materials
- Shanghai University
- Shanghai 200444
- China
| | - Wentao Sun
- Medical Science & Research Center
- Beijing Shijitan Hospital
- Capital Medical University
- Beijing 100038
- P. R. China
| | - Shifeng Yan
- Department of Polymer Materials
- Shanghai University
- Shanghai 200444
- China
| | - Lei Cui
- Medical Science & Research Center
- Beijing Shijitan Hospital
- Capital Medical University
- Beijing 100038
- P. R. China
| | - Jingbo Yin
- Department of Polymer Materials
- Shanghai University
- Shanghai 200444
- China
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7
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Kakkar D, Mazzaferro S, Thevenot J, Schatz C, Bhatt A, Dwarakanath BS, Singh H, Mishra AK, Lecommandoux S. Amphiphilic PEO-b
-PBLG Diblock and PBLG-b
-PEO-b
-PBLG Triblock Copolymer Based Nanoparticles: Doxorubicin Loading and In Vitro
Evaluation. Macromol Biosci 2014; 15:124-37. [DOI: 10.1002/mabi.201400451] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Revised: 11/06/2014] [Indexed: 11/09/2022]
Affiliation(s)
- Dipti Kakkar
- Université de Bordeaux/Bordeaux-INP; ENSCBP CNRS, Laboratoire de Chimie des Polymères Organiques (UMR5629); 16 avenue Pey Berland 33607 Pessac Cedex France
- Institute of Nuclear Medicine and Allied Sciences; Brig. S.K. Mazumdar Road Timarpur Delhi 110054 India
- Centre for Biomedical Engineering; Indian Institute of Technology; Hauz Khas New Delhi 110016 India
- CNRS; Laboratoire de Chimie des Polymeres Organiques (UMR5629); Pessac France
| | - Silvia Mazzaferro
- Université de Bordeaux/Bordeaux-INP; ENSCBP CNRS, Laboratoire de Chimie des Polymères Organiques (UMR5629); 16 avenue Pey Berland 33607 Pessac Cedex France
- CNRS; Laboratoire de Chimie des Polymeres Organiques (UMR5629); Pessac France
| | - Julie Thevenot
- Université de Bordeaux/Bordeaux-INP; ENSCBP CNRS, Laboratoire de Chimie des Polymères Organiques (UMR5629); 16 avenue Pey Berland 33607 Pessac Cedex France
- CNRS; Laboratoire de Chimie des Polymeres Organiques (UMR5629); Pessac France
| | - Christophe Schatz
- Université de Bordeaux/Bordeaux-INP; ENSCBP CNRS, Laboratoire de Chimie des Polymères Organiques (UMR5629); 16 avenue Pey Berland 33607 Pessac Cedex France
- CNRS; Laboratoire de Chimie des Polymeres Organiques (UMR5629); Pessac France
| | - Anant Bhatt
- Institute of Nuclear Medicine and Allied Sciences; Brig. S.K. Mazumdar Road Timarpur Delhi 110054 India
| | - Bilikere S. Dwarakanath
- Institute of Nuclear Medicine and Allied Sciences; Brig. S.K. Mazumdar Road Timarpur Delhi 110054 India
| | - Harpal Singh
- Centre for Biomedical Engineering; Indian Institute of Technology; Hauz Khas New Delhi 110016 India
| | - Anil K. Mishra
- Institute of Nuclear Medicine and Allied Sciences; Brig. S.K. Mazumdar Road Timarpur Delhi 110054 India
| | - Sebastien Lecommandoux
- Université de Bordeaux/Bordeaux-INP; ENSCBP CNRS, Laboratoire de Chimie des Polymères Organiques (UMR5629); 16 avenue Pey Berland 33607 Pessac Cedex France
- CNRS; Laboratoire de Chimie des Polymeres Organiques (UMR5629); Pessac France
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8
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de Miguel L, Popa I, Noiray M, Caudron E, Arpinati L, Desmaele D, Cebrián-Torrejón G, Doménech-Carbó A, Ponchel G. Osteotropic Polypeptide Nanoparticles with Dual hydroxyapatite Binding Properties and Controlled Cisplatin Delivery. Pharm Res 2014; 32:1794-803. [DOI: 10.1007/s11095-014-1576-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Accepted: 11/11/2014] [Indexed: 12/18/2022]
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9
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de Miguel L, Noiray M, Surpateanu G, Iorga BI, Ponchel G. Poly(γ-benzyl-L-glutamate)-PEG-alendronate multivalent nanoparticles for bone targeting. Int J Pharm 2013; 460:73-82. [PMID: 24211357 DOI: 10.1016/j.ijpharm.2013.10.048] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Revised: 10/21/2013] [Accepted: 10/28/2013] [Indexed: 10/26/2022]
Abstract
Hydroxyapatite (HAP), a highly specific component of bone tissue, is the main target in order to impart osteotropicity. Bone targeted nanoparticles can increase the strength of the interaction with HAP through multivalency and thus constitute a valuable strategy in the therapeutics of skeletal diseases. PBLG10k-b-PEG6k-alendronate nanoparticles (~ 75 nm) were prepared by a simple nanoprecipitation method. The calcium affinity (KCa(+2)=1.8 × 10(4)M(-1)) of these nanoparticles was evaluated using isothermal titration calorimetry. The multivalent interaction with HAP surfaces (KHAP) was studied by fluorescence and was estimated to be 1.1 × 10(10)M(-1), which is more than 4000 times stronger than the reported monovalent interaction between alendronate and HAP surfaces. Molecular modeling suggests that the number of binding sites available at the HAP surface is in large excess than what is required for the whole surface coverage by alendronate decorated nanoparticles. The lower calcium affinity of these nanoparticles than for HAP allows calcium bound nanoparticles to interact with HAP, which yields a deeper understanding of bone targeted carriers and could potentially improve their bone targeting properties.
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Affiliation(s)
- Laura de Miguel
- Univ. Paris Sud, UMR CNRS 8612, Institut Galien, 92296 Châtenay-Malabry Cedex, France.
| | - Magali Noiray
- Univ. Paris Sud, UMR CNRS 8612, Institut Galien, 92296 Châtenay-Malabry Cedex, France
| | - Georgiana Surpateanu
- Institut de Chimie des Substances Naturelles, CNRS UPR 2301, Centre de Recherche de Gif-sur-Yvette, 1 Avenue de la Terrasse, 91198 Gif-sur-Yvette, France
| | - Bogdan I Iorga
- Institut de Chimie des Substances Naturelles, CNRS UPR 2301, Centre de Recherche de Gif-sur-Yvette, 1 Avenue de la Terrasse, 91198 Gif-sur-Yvette, France
| | - Gilles Ponchel
- Univ. Paris Sud, UMR CNRS 8612, Institut Galien, 92296 Châtenay-Malabry Cedex, France
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10
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Cauchois O, Segura-Sanchez F, Ponchel G. Molecular weight controls the elongation of oblate-shaped degradable poly(γ-benzyl-l-glutamate)nanoparticles. Int J Pharm 2013; 452:292-9. [DOI: 10.1016/j.ijpharm.2013.04.074] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Revised: 04/24/2013] [Accepted: 04/25/2013] [Indexed: 11/29/2022]
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11
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Ramon AL, Bertrand JR, de Martimprey H, Bernard G, Ponchel G, Malvy C, Vauthier C. siRNA associated with immunonanoparticles directed against cd99 antigen improves gene expression inhibitionin vivoin Ewing's sarcoma. J Mol Recognit 2013; 26:318-29. [DOI: 10.1002/jmr.2276] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2012] [Revised: 02/26/2013] [Accepted: 03/04/2013] [Indexed: 12/20/2022]
Affiliation(s)
| | - J. R. Bertrand
- CNRS UMR 8203 Vectorologie et thérapeutiques anticancéreuses; 114 rue Edouard Vaillant; 94805; Villejuif Cedex; France
| | | | | | | | - C. Malvy
- CNRS UMR 8203 Vectorologie et thérapeutiques anticancéreuses; 114 rue Edouard Vaillant; 94805; Villejuif Cedex; France
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12
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Wu Y, Ma Q, Song X, Zheng Y, Ren W, Zhang J, Ouyang L, Wu F, He G. Biocompatible poly(ethylene glycol)-poly(γ-cholesterol-L-glutamate) copolymers: Synthesis, characterization, andin vitrostudies. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/pola.26265] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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13
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How to conduct and interpret ITC experiments accurately for cyclodextrin–guest interactions. Drug Discov Today 2012; 17:623-9. [DOI: 10.1016/j.drudis.2012.01.023] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2011] [Revised: 12/08/2011] [Accepted: 01/26/2012] [Indexed: 01/01/2023]
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14
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Gu PF, Xu H, Sui BW, Gou JX, Meng LK, Sun F, Wang XJ, Qi N, Zhang Y, He HB, Tang X. Polymeric micelles based on poly(ethylene glycol) block poly(racemic amino acids) hybrid polypeptides: conformation-facilitated drug-loading behavior and potential application as effective anticancer drug carriers. Int J Nanomedicine 2012; 7:109-22. [PMID: 22275827 PMCID: PMC3260955 DOI: 10.2147/ijn.s27475] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2012] [Indexed: 11/23/2022] Open
Abstract
In this work, racemic hybrid polypeptides poly(ethylene glycol) (PEG)-b-poly(racemic-leucine) (PRL) copolymers with different leucine residues have been synthesized and characterized. Using docetaxel as a model molecule, the high drug-loaded spherical micelles based on PEG-PRL were prepared successfully using dialysis, with a tunable particle size from 170 nm to 250 nm obtained by changing the length of the hydrophobic blocks. Facilitated drug-loading behavior (higher drug-loading ability and easier drug-loading process) of PEG-PRL compared with their corresponding levo forms (PEG-b-poly[levo leucine]) was observed and clarified for the first time. With this facilitation, the highest drug-loading content and efficiency of PEG-PRL micelles can achieve 11.2% ± 0.4% and 67.2% ± 2.4%, respectively. All drug-loaded PEG-PRL micelles exhibit a similar release behavior with a sustained release up to 72 hours. The PEG-PRL was shown to be nontoxic against MCF-7 and human umbilical vein endothelial cells up to a concentration of 100 μg/mL, displaying a good biocompatibility. Also, the docetaxel-loaded PEG-PRL micelles were more toxic than the free drug against MCF-7 human breast cancer cells – both dose and time dependent. Therefore, these high docetaxel-loaded micelles based on racemic hybrid polypeptides appear to be a novel promising nanomedicine for anticancer therapy.
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Affiliation(s)
- Peng Fei Gu
- Department of Pharmaceutics, Shenyang Pharmaceutical University, No 103, Wenhua Road, Shenyang, People’s Republic of China
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15
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Naveena N, Venugopal J, Rajeswari R, Sundarrajan S, Sridhar R, Shayanti M, Narayanan S, Ramakrishna S. Biomimetic composites and stem cells interaction for bone and cartilage tissue regeneration. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c1jm14401d] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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16
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Ravichandran R, Venugopal JR, Sundarrajan S, Mukherjee S, Ramakrishna S. Precipitation of nanohydroxyapatite on PLLA/PBLG/Collagen nanofibrous structures for the differentiation of adipose derived stem cells to osteogenic lineage. Biomaterials 2011; 33:846-55. [PMID: 22048006 DOI: 10.1016/j.biomaterials.2011.10.030] [Citation(s) in RCA: 177] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2011] [Accepted: 10/11/2011] [Indexed: 12/13/2022]
Abstract
Tissue engineering and nanotechnology have enabled engineering of nanostructured materials to meet the current challenges in bone treatment owing to rising occurrence of bone diseases, accidental damages and defects. Poly(L-lactic acid)/Poly-benzyl-L-glutamate/Collagen (PLLA/PBLG/Col) scaffolds were fabricated by electrospinning and nanohydroxyapatite (n-HA) was deposited by calcium-phosphate dipping method for bone tissue engineering (BTE). The abundance and accessibility of adipose derived stem cells (ADSC) may prove to be novel cell therapeutics for bone repair and regeneration. ADSCs were cultured on these scaffolds and were induced to undergo osteogenic differentiation in the presence of PBLG/n-HA for BTE. The cell-biomaterial interactions were analyzed using cell proliferation, SEM and CMFDA dye extraction techniques. Osteogenic differentiation of ADSC was confirmed using alkaline phosphatase activity (ALP), mineralization (ARS) and dual immunofluorescent staining using both ADSC marker protein and Osteocalcin, which is a bone specific protein. The utmost significance of this study is the bioactive PBLG/n-HA biomolecule introduced on the polymeric nanofibers to regulate and improve specific biological functions like adhesion, proliferation and differentiation of ADSC into osteogenic lineage. This was evident from the immunostaining and CMFDA images of ADSCs showing cuboidal morphology, characteristic of osteogenic lineage. The observed results proved that the PLLA/PBLG/Col/n-HA scaffolds promoted greater osteogenic differentiation of ADSC as evident from the enzyme activity and mineralization profiles for bone tissue engineering.
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Affiliation(s)
- Rajeswari Ravichandran
- Healthcare and Energy Materials Laboratory, Nanoscience and Nanotechnology Initiative, National University of Singapore, Singapore
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17
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Ozcan I, Bouchemal K, Segura-Sánchez F, Ozer O, Güneri T, Ponchel G. Synthesis and characterization of surface-modified PBLG nanoparticles for bone targeting: in vitro and in vivo evaluations. J Pharm Sci 2011; 100:4877-87. [PMID: 21698603 DOI: 10.1002/jps.22678] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2010] [Revised: 02/16/2011] [Accepted: 06/03/2011] [Indexed: 11/06/2022]
Abstract
In this study, poly(γ-benzyl-l-glutamate) (PBLG) polypeptide derivatives were synthesized by ring-opening polymerization of amino acid N-carboxyanhydride using selected amine-terminated initiators. Alendronate, a targeting moiety that has a strong affinity for bone, was conjugated to PBLG. Monomethoxy polyethylene glycol (PEG) was used for a hydrophilic layer on the surface of the nanoparticles (NPs) to avoid reticuloendothelial system uptake. NPs were prepared by nanoprecipitation technique not only for PBLG or PBLG-PEG but also for composite polymers with different ratios. Fluorescein isothiocyanate would be attached to the NPs as a labeling agent. The size and morphology of NPs were evaluated by dynamic laser light scattering and transmission electron microscopy, and were found to be in a useful range (less than 80 nm) for bone-targeted drug delivery. In addition, the PEGylation of NPs was supported by isothermal titration calorimetry analysis. The bone-targeting potential of NPs was evaluated in vitro by calcium binding and hydroxyapatite affinity assays, and in vivo by fluorescent imaging experiments on rats. The targeted NPs showed bright fluorescent labeling in femur tissue. These results demonstrated the possibility of optimized NPs prepared with new PBLG derivatives to accumulate in bone successfully.
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Affiliation(s)
- Ipek Ozcan
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Ege University, 35100 Izmir, Turkey.
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18
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Huang W, Wang W, Wang P, Zhang CN, Tian Q, Zhang Y, Wang XH, Cha RT, Wang CH, Yuan Z. Glycyrrhetinic acid-functionalized degradable micelles as liver-targeted drug carrier. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2011; 22:853-863. [PMID: 21373811 DOI: 10.1007/s10856-011-4262-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2010] [Accepted: 02/17/2011] [Indexed: 05/30/2023]
Abstract
Recently, many efforts have been devoted to investigating the application of functionalized micelles as targeted drug delivery carriers. In this study, glycyrrhetinic acid (GA, a liver targeting ligand) modified poly(ethylene glycol)-b-poly(γ-benzyl L-glutamate) micelles were prepared and evaluated as a potential liver-targeted drug carrier. The aggregation behavior, stability, size and morphology of the micelles were investigated. Anticancer drug doxorubicin (DOX) was encapsulated in the micelles. The drug release profile, in vivo distribution and the cytotoxicity against hepatic carcinoma QGY-7703 cells of DOX-loaded micelles were studied. The results indicated that the release profile was pH-dependent with Fickian diffusion kinetics. The micelles were remarkably targeted to the liver, inducing a 4.9-fold higher DOX concentration than that for free DOX · HCl. The DOX-loaded micelles exhibited almost twofold more potent cytotoxicity compared with DOX · HCl, and the cytotoxicity was time- and dosage-dependent. These results suggest that GA-functionalized micelles represent a promising carrier for drug delivery to the liver.
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Affiliation(s)
- Wei Huang
- Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China
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Ozcan I, Segura-Sánchez F, Bouchemal K, Sezak M, Ozer O, Güneri T, Ponchel G. Pegylation of poly(γ-benzyl-L-glutamate) nanoparticles is efficient for avoiding mononuclear phagocyte system capture in rats. Int J Nanomedicine 2010; 5:1103-11. [PMID: 21270961 PMCID: PMC3023239 DOI: 10.2147/ijn.s15493] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Poly(γ-benzyl-L-glutamate) (PBLG) derivatives are synthetic polypeptides for preparing nanoparticles with well controlled surface properties. The aim of this paper was to investigate the biodistribution of pegylated PBLG in rats. For this purpose, nanoparticles were prepared by a nanoprecipitation method using mixtures of different PBLG derivates, including a pegylated derivate to avoid mononuclear phagocyte system uptake. The morphology, size distribution, and surface charge of the nanoparticles were investigated as a function of the amount of polymer employed for the preparation. Moderately polydispersed nanoparticles (polydispersity index less than 0.2) were obtained. Their size increased with polymer concentration. The zeta potential values were negative whatever the formulations. The availability of polyethylene glycol chains on the nanoparticles’ surface was confirmed by measuring the decrease in bovine serum albumin adsorption. For in vivo distribution studies, pegylated and nonpegylated nanoparticles were prepared with polymer mixtures containing PBLG-fluorescein isothiocyanate and imaged by fluorescence microscopy to measure their accumulation in liver and spleen tissues of rats after intravenous administration. Injection of stealth formulations resulted in negligible fluorescence in liver and spleen compared with nonpegylated formulations, which suggests that these nanoparticles are promising candidates as a stealth-type long-circulating drug carrier system and could be useful for active targeting of drugs while reducing systemic side effects.
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Affiliation(s)
- Ipek Ozcan
- Ege University, Faculty of Pharmacy, Department of Pharmaceutical Technology, Izmir, Turkey.
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