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Mucus-Penetrating Silk Fibroin-Based Nanotherapeutics for Efficient Treatment of Ulcerative Colitis. Biomolecules 2022; 12:biom12091263. [PMID: 36139101 PMCID: PMC9496219 DOI: 10.3390/biom12091263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 08/25/2022] [Accepted: 09/06/2022] [Indexed: 11/16/2022] Open
Abstract
Oral nanoparticles have been considered a prospective drug delivery carrier against ulcerative colitis (UC). To enhance the mucus-penetrating capacity and aqueous solubility, and strengthen the anti-inflammatory effect of resveratrol (RSV), we fabricated RSV-loaded silk fibroin-based nanoparticles with the functionalization of Pluronic F127 (PF-127). The obtained PF-127-functionalized RSV-loaded NPs had an average particle size around 170 nm, a narrow size distribution (polydispersity index < 0.2), and negative zeta potential (−20.5 mV). Our results indicated that the introduction of PF-127 strengthened the mucus-penetrating property of NPs. In vitro studies suggested that NPs with PF-127 enhanced the suppression of the secretion of proinflammatory cytokine TNF-α and reactive oxygen species (ROS) from RAW 264.7 macrophages under lipopolysaccharide stimulation in comparison with other counterparts. According to the evaluation of macro symptoms and main inflammatory cytokines, we further report preferable therapeutic outcomes achieved by PF-127 functionalized-NP-treated dextran sulphate sodium (DSS) groups in the colitis model compared with blank silk fibroin NPs and RSV-loaded NPs without the functionalization of PF-127. Taken together, this work suggests that the fabricated PF-127 NPs via the oral route are promising and useful RSV-loaded nanocarriers for UC treatment.
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Andreadis II, Karavasili C, Thomas A, Komnenou A, Tzimtzimis M, Tzetzis D, Andreadis D, Bouropoulos N, Fatouros DG. In Situ Gelling Electrospun Ocular Films Sustain the Intraocular Pressure-Lowering Effect of Timolol Maleate: In Vitro, Ex Vivo, and Pharmacodynamic Assessment. Mol Pharm 2022; 19:274-286. [PMID: 34877863 DOI: 10.1021/acs.molpharmaceut.1c00766] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Most common intraocular pressure (IOP) reduction regimens for the management of glaucoma include the topical use of eye drops, a dosage form that is associated with short residence time at the site of action, increased dosing frequency, and reduced patient compliance. In situ gelling nanofiber films comprising poly(vinyl alcohol) and Poloxamer 407 were fabricated via electrospinning for the ocular delivery of timolol maleate (TM), aiming to sustain the IOP-lowering effect of the β-blocker, compared to conventional eye drops. The electrospinning process was optimized, and the physicochemical properties of the developed formulations were thoroughly investigated. The fiber diameters of the drug-loaded films ranged between 123 and 145 nm and the drug content between 5.85 and 7.83% w/w. Total in vitro drug release from the ocular films was attained within 15 min following first-order kinetics, showing higher apparent permeability (Papp) values across porcine corneas compared to the drug's solution. The fabricated films did not induce any ocular irritation as evidenced by both the hen's egg test on chorioallantoic membrane and the in vivo Draize test. In vivo administration of the ocular films in rabbits induced a faster onset of action and a sustained IOP-lowering effect up to 24 h compared to TM solution, suggesting that the proposed ocular films are promising systems for the sustained topical delivery of TM.
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Affiliation(s)
- Ioannis I Andreadis
- Laboratory of Pharmaceutical Technology, Department of Pharmacy, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki GR 54124, Greece
| | - Christina Karavasili
- Laboratory of Pharmaceutical Technology, Department of Pharmacy, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki GR 54124, Greece
| | - Angelos Thomas
- Comparative Ophthalmology Unit, Department of Clinical Studies, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki GR 54627, Greece
| | - Anastasia Komnenou
- Comparative Ophthalmology Unit, Department of Clinical Studies, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki GR 54627, Greece
| | - Manolis Tzimtzimis
- Digital Manufacturing and Materials Characterization Laboratory, School of Science and Technology, International Hellenic University, Thermi 57001, Greece
| | - Dimitrios Tzetzis
- Digital Manufacturing and Materials Characterization Laboratory, School of Science and Technology, International Hellenic University, Thermi 57001, Greece
| | - Dimitrios Andreadis
- Department of Oral Medicine/Pathology, School of Dentistry, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki GR-54124, Greece
| | - Nikolaos Bouropoulos
- Department of Materials Science, University of Patras, Patras GR-26504, Greece.,Foundation for Research and Technology Hellas, Institute of Chemical Engineering and High Temperature Chemical Processes, Patras GR-26504, Greece
| | - Dimitrios G Fatouros
- Laboratory of Pharmaceutical Technology, Department of Pharmacy, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki GR 54124, Greece
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Ma P, Gou S, Ma Y, Chen Q, Zhu S, Chen J, Kang Y, Xiao B. Modulation of drug release by decoration with Pluronic F127 to improve anti-colon cancer activity of electrospun fibrous meshes. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 99:591-598. [DOI: 10.1016/j.msec.2019.01.130] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 08/16/2018] [Accepted: 01/29/2019] [Indexed: 12/24/2022]
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Mehta P, Zaman A, Smith A, Rasekh M, Haj‐Ahmad R, Arshad MS, der Merwe S, Chang M, Ahmad Z. Broad Scale and Structure Fabrication of Healthcare Materials for Drug and Emerging Therapies via Electrohydrodynamic Techniques. ADVANCED THERAPEUTICS 2018. [DOI: 10.1002/adtp.201800024] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Prina Mehta
- Leicester School of PharmacyDe Montfort University Leicester LE1 9BH UK
| | - Aliyah Zaman
- Leicester School of PharmacyDe Montfort University Leicester LE1 9BH UK
| | - Ashleigh Smith
- School of Pharmacy and Biomedical SciencesSt. Michael's BuildingUniversity of Portsmouth White Swan Road Portsmouth PO1 2DT UK
| | - Manoochehr Rasekh
- Leicester School of PharmacyDe Montfort University Leicester LE1 9BH UK
| | - Rita Haj‐Ahmad
- Leicester School of PharmacyDe Montfort University Leicester LE1 9BH UK
| | | | - Susanna der Merwe
- School of Pharmacy and Biomedical SciencesSt. Michael's BuildingUniversity of Portsmouth White Swan Road Portsmouth PO1 2DT UK
| | - M.‐W. Chang
- College of Biomedical Engineering and Instrument ScienceZhejiang University Hangzhou 310027 China
- Zhejiang Provincial Key Laboratory of Cardio‐Cerebral Vascular Detection Technology and Medicinal Effectiveness AppraisalZhejiang University Hangzhou 310027 China
| | - Z. Ahmad
- Leicester School of PharmacyDe Montfort University Leicester LE1 9BH UK
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Kishan A, Walker T, Sears N, Wilems T, Cosgriff-Hernandez E. Winner of the society for biomaterials student award in the Ph.D. category for the annual meeting of the society for biomaterials, april 11-14, 2018, Atlanta, GA: Development of a bimodal, in situ crosslinking method to achieve multifactor release from el. J Biomed Mater Res A 2018; 106:1155-1164. [DOI: 10.1002/jbm.a.36342] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Accepted: 01/10/2018] [Indexed: 11/07/2022]
Affiliation(s)
- Alysha Kishan
- Department of Biomedical Engineering; Texas A&M University; College Station Texas 77843
| | - Taneidra Walker
- Department of Biomedical Engineering; The University of Texas at Austin; Austin Texas 78712
| | - Nick Sears
- Department of Biomedical Engineering; Texas A&M University; College Station Texas 77843
| | - Thomas Wilems
- Department of Biomedical Engineering; The University of Texas at Austin; Austin Texas 78712
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Buscemi S, Palumbo V, Maffongelli A, Fazzotta S, Palumbo F, Licciardi M, Fiorica C, Puleio R, Cassata G, Fiorello L, Buscemi G, lo Monte A. Electrospun PHEA-PLA/PCL Scaffold for Vascular Regeneration: A Preliminary in Vivo Evaluation. Transplant Proc 2017; 49:716-721. [DOI: 10.1016/j.transproceed.2017.02.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Mehta P, Haj-Ahmad R, Rasekh M, Arshad MS, Smith A, van der Merwe SM, Li X, Chang MW, Ahmad Z. Pharmaceutical and biomaterial engineering via electrohydrodynamic atomization technologies. Drug Discov Today 2017; 22:157-165. [DOI: 10.1016/j.drudis.2016.09.021] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Revised: 08/17/2016] [Accepted: 09/22/2016] [Indexed: 10/20/2022]
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Song J, Sun B, Liu S, Chen W, Zhang Y, Wang C, Mo X, Che J, Ouyang Y, Yuan W, Fan C. Polymerizing Pyrrole Coated Poly (l-lactic acid-co-ε-caprolactone) (PLCL) Conductive Nanofibrous Conduit Combined with Electric Stimulation for Long-Range Peripheral Nerve Regeneration. Front Mol Neurosci 2016; 9:117. [PMID: 27877111 PMCID: PMC5100554 DOI: 10.3389/fnmol.2016.00117] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Accepted: 10/21/2016] [Indexed: 12/02/2022] Open
Abstract
Electrospinning and electric stimulation (ES) are both promising methods to support neuron adhesion and guide extension of neurons for nerve regeneration. Concurrently, all studies focus on either electrospinning for conduits material or ES in vitro study to accelerate nerve regeneration; few work on the combined use of these two strategies or ES in vivo study. Therefore, this study aimed to investigate the abilities of direct current ES through electrospinning conductive polymer composites composed of polypyrrole and Poly (l-lactic acid-co-ε-caprolactone) (PPY/PLCL) in peripheral nerve regeneration. PPY/PLCL composite conduits were synthesized by polymerizing pyrrole coated electrospun PLCL scaffolds. Morphologies and chemical compositions were characterized by scanning electron microscope and attenuated total reflection fourier transform infrared (ATR-FTIR) microscope. Rat pheochromocytoma 12 (PC12) cells and dorsal root ganglia (DRG) cells cultured on PPY/PLCL scaffolds were stimulated with 100 mV/cm for 4 h per day. The median neurite length and cell viability were measured in PC-12 cells. The levels of brain-derived neurotrophic factor (BDNF), glial cell derived neurotrophic factor (GDNF) and neurotrophin-3 (NT-3) were analyzed in DRG cells. In rats, 15 mm gaps of sciatic nerves were bridged using an autograft, non-stimulated PPY/PLCL conduit and PPY/PLCL conduit stimulated with 100 mV potential, respectively. A 100 mV potential direct current ES was applied for 1 h per day at 1, 3, 5 and 7 days post-implantation. The PPY/PLCL conduits with ES showed a similar performance compared with the autograft group, and significantly better than the non-stimulated PPY/PLCL conduit group. These promising results show that the PPY/PLCL conductive conduits’ combined use with ES has great potential for peripheral nerve regeneration.
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Affiliation(s)
- Jialin Song
- Shanghai Jiao Tong University Affiliated Sixth People's HospitalShanghai, China; Shanghai Sixth People's Hospital East Campus, Shanghai University of Medicine and HealthShanghai, China
| | - Binbin Sun
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University Shanghai, China
| | - Shen Liu
- Shanghai Jiao Tong University Affiliated Sixth People's Hospital Shanghai, China
| | - Wei Chen
- Shanghai Jiao Tong University Affiliated Sixth People's Hospital Shanghai, China
| | - Yuanzheng Zhang
- Changhai Hospital of Second Military Medical University Shanghai, China
| | - Chunyang Wang
- Shanghai Jiao Tong University Affiliated Sixth People's Hospital Shanghai, China
| | - Xiumei Mo
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University Shanghai, China
| | - Junyi Che
- School of Pharmacy, Shanghai Jiao Tong University Shanghai, China
| | - Yuanming Ouyang
- Shanghai Jiao Tong University Affiliated Sixth People's HospitalShanghai, China; Shanghai Sixth People's Hospital East Campus, Shanghai University of Medicine and HealthShanghai, China
| | - Weien Yuan
- School of Pharmacy, Shanghai Jiao Tong University Shanghai, China
| | - Cunyi Fan
- Shanghai Jiao Tong University Affiliated Sixth People's Hospital Shanghai, China
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Surface biofunctional drug-loaded electrospun fibrous scaffolds for comprehensive repairing hypertrophic scars. Biomaterials 2016; 83:169-81. [DOI: 10.1016/j.biomaterials.2016.01.002] [Citation(s) in RCA: 101] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Revised: 12/25/2015] [Accepted: 01/01/2016] [Indexed: 12/24/2022]
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Fabrication of functional PLGA-based electrospun scaffolds and their applications in biomedical engineering. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 59:1181-1194. [DOI: 10.1016/j.msec.2015.11.026] [Citation(s) in RCA: 137] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Revised: 10/22/2015] [Accepted: 11/09/2015] [Indexed: 12/17/2022]
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Mangır N, Bullock AJ, Roman S, Osman N, Chapple C, MacNeil S. Production of ascorbic acid releasing biomaterials for pelvic floor repair. Acta Biomater 2016; 29:188-197. [PMID: 26478470 PMCID: PMC4678952 DOI: 10.1016/j.actbio.2015.10.019] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Revised: 09/10/2015] [Accepted: 10/14/2015] [Indexed: 01/31/2023]
Abstract
OBJECTIVE An underlying abnormality in collagen turnover is implied in the occurrence of complications and recurrences after mesh augmented pelvic floor repair surgeries. Ascorbic acid is a potent stimulant of collagen synthesis. The aim of this study is to produce ascorbic acid releasing poly-lactic acid (PLA) scaffolds and evaluate them for their effects on extracellular matrix production and the strength of the materials. MATERIALS AND METHODS Scaffolds which contained either l-ascorbic acid (AA) and Ascorbate-2-Phosphate (A2P) were produced with emulsion electrospinning. The release of both drugs was measured by UV spectrophotometry. Human dermal fibroblasts were seeded on scaffolds and cultured for 2weeks. Cell attachment, viability and total collagen production were evaluated as well as mechanical properties. RESULTS No significant differences were observed between AA, A2P, Vehicle and PLA scaffolds in terms of fibre diameter and pore size. The encapsulation efficiency and successful release of both AA and A2P were demonstrated. Both AA and A2P containing scaffolds were significantly more hydrophilic and stronger in both dry and wet states compared to PLA scaffolds. Fibroblasts produced more collagen on scaffolds containing either AA or A2P compared to cells grown on control scaffolds. CONCLUSION This study is the first to directly compare the two ascorbic acid derivatives in a tissue engineered scaffold and shows that both AA and A2P releasing electrospun PLA scaffolds increased collagen production of fibroblasts to similar extents but AA scaffolds seemed to be more hydrophilic and stronger compared to A2P scaffolds. STATEMENT OF SIGNIFICANCE Mesh augmented surgical repair of the pelvic floor currently relies on non-degradable materials which results in severe complications in some patients. There is an unmet and urgent need for better pelvic floor repair materials. Our current understanding suggests that the ideal material should be able to better integrate into sites of implantation both biologically and mechanically. The impact of vitamin C on extracellular matrix production is well established but we in this study have undertaken a critical comparison of two derivatives of vitamin C as they are released from a biodegradable scaffold. This strategy proved to be equally useful with both derivatives in terms of new tissue production yet we observed significant differences in mechanical properties of these biomaterials.
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Affiliation(s)
- Naşide Mangır
- Department of Materials Science Engineering, Kroto Research Institute, University of Sheffield, United Kingdom; Royal Hallamshire Hospital, Urology Clinic, Sheffield, United Kingdom
| | - Anthony J Bullock
- Department of Materials Science Engineering, Kroto Research Institute, University of Sheffield, United Kingdom
| | - Sabiniano Roman
- Department of Materials Science Engineering, Kroto Research Institute, University of Sheffield, United Kingdom
| | - Nadir Osman
- Department of Materials Science Engineering, Kroto Research Institute, University of Sheffield, United Kingdom; Royal Hallamshire Hospital, Urology Clinic, Sheffield, United Kingdom
| | | | - Sheila MacNeil
- Department of Materials Science Engineering, Kroto Research Institute, University of Sheffield, United Kingdom.
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Chandra P, Lee SJ. Synthetic Extracellular Microenvironment for Modulating Stem Cell Behaviors. Biomark Insights 2015; 10:105-16. [PMID: 26106260 PMCID: PMC4472032 DOI: 10.4137/bmi.s20057] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Revised: 04/12/2015] [Accepted: 04/13/2015] [Indexed: 11/30/2022] Open
Abstract
The innate ability of stem cells to self-renew and differentiate into multiple cell types makes them a promising source for tissue engineering and regenerative medicine applications. Their capacity for self-renewal and differentiation is largely influenced by the combination of physical, chemical, and biological signals found in the stem cell niche, both temporally and spatially. Embryonic and adult stem cells are potentially useful for cell-based approaches; however, regulating stem cell behavior remains a major challenge in their clinical use. Most of the current approaches for controlling stem cell fate do not fully address all of the complex signaling pathways that drive stem cell behaviors in their natural microenvironments. To overcome this limitation, a new generation of biomaterials is being developed for use as three-dimensional synthetic microenvironments that can mimic the regulatory characteristics of natural extracellular matrix (ECM) proteins and ECM-bound growth factors. These synthetic microenvironments are currently being investigated as a substrate with surface immobilization and controlled release of bioactive molecules to direct the stem cell fate in vitro, as a tissue template to guide and improve the neo-tissue formation both in vitro and in vivo, and as a delivery vehicle for cell therapy in vivo. The continued advancement of such an intelligent biomaterial system as the synthetic extracellular microenvironment holds the promise of improved therapies for numerous debilitating medical conditions for which no satisfactory cure exists today.
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Affiliation(s)
- Prafulla Chandra
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Sang Jin Lee
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA
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Asadian M, Rashidi A, Majidi M, Mehrjoo M, Emami BA, Tavassoli H, Asl MP, Bonakdar S. Nanofiber protein adsorption affected by electrospinning physical processing parameters. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2015. [DOI: 10.1007/s13738-014-0569-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Thomas M, Arora A, Katti DS. Surface hydrophilicity of PLGA fibers governs in vitro mineralization and osteogenic differentiation. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 45:320-32. [DOI: 10.1016/j.msec.2014.08.074] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 08/23/2014] [Accepted: 08/30/2014] [Indexed: 10/24/2022]
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Complementary effects of two growth factors in multifunctionalized silk nanofibers for nerve reconstruction. PLoS One 2014; 9:e109770. [PMID: 25313579 PMCID: PMC4196919 DOI: 10.1371/journal.pone.0109770] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Accepted: 09/12/2014] [Indexed: 11/20/2022] Open
Abstract
With the aim of forming bioactive guides for peripheral nerve regeneration, silk fibroin was electrospun to obtain aligned nanofibers. These fibers were functionalized by incorporating Nerve Growth Factor (NGF) and Ciliary NeuroTrophic Factor (CNTF) during electrospinning. PC12 cells grown on the fibers confirmed the bioavailability and bioactivity of the NGF, which was not significantly released from the fibers. Primary neurons from rat dorsal root ganglia (DRGs) were grown on the nanofibers and anchored to the fibers and grew in a directional fashion based on the fiber orientation, and as confirmed by growth cone morphology. These biofunctionalized nanofibers led to a 3-fold increase in neurite length at their contact, which was likely due to the NGF. Glial cell growth, alignment and migration were stimulated by the CNTF in the functionalized nanofibers. Organotypic culture of rat fetal DRGs confirmed the complementary effect of both growth factors in multifunctionalized nanofibers, which allowed glial cell migration, alignment and parallel axonal growth in structures resembling the ‘bands of Bungner’ found in situ. Graftable multi-channel conduits based on biofunctionalized aligned silk nanofibers were developed as an organized 3D scaffold. Our bioactive silk tubes thus represent new options for a biological and biocompatible nerve guidance conduit.
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Bioengineered vascular scaffolds: the state of the art. Int J Artif Organs 2014; 37:503-12. [PMID: 25044387 DOI: 10.5301/ijao.5000343] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/25/2014] [Indexed: 11/20/2022]
Abstract
To date, there is increasing clinical need for vascular substitutes due to accidents, malformations, and ischemic diseases. Over the years, many approaches have been developed to solve this problem, starting from autologous native vessels to artificial vascular grafts; unfortunately, none of these have provided the perfect vascular substitute. All have been burdened by various complications, including infection, thrombogenicity, calcification, foreign body reaction, lack of growth potential, late stenosis and occlusion from intimal hyperplasia, and pseudoaneurysm formation. In the last few years, vascular tissue engineering has emerged as one of the most promising approaches for producing mechanically competent vascular substitutes. Nanotechnologies have contributed their part, allowing extraordinarily biostable and biocompatible materials to be developed. Specifically, the use of electrospinning to manufacture conduits able to guarantee a stable flow of biological fluids and guide the formation of a new vessel has revolutionized the concept of the vascular substitute. The electrospinning technique allows extracellular matrix (ECM) to be mimicked with high fidelity, reproducing its porosity and complexity, and providing an environment suitable for cell growth. In the future, a better knowledge of ECM and the manufacture of new materials will allow us to "create" functional biological vessels - the base required to develop organ substitutes and eventually solve the problem of organ failure.
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Battig MR, Huang Y, Chen N, Wang Y. Aptamer-functionalized superporous hydrogels for sequestration and release of growth factors regulated via molecular recognition. Biomaterials 2014; 35:8040-8. [PMID: 24954732 DOI: 10.1016/j.biomaterials.2014.06.001] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2014] [Accepted: 06/01/2014] [Indexed: 10/25/2022]
Abstract
While the discovery of highly potent biologics has led to the development of promising therapies for various human diseases, biologics can cause severe toxicity if delivered inappropriately. Thus, great efforts have been made to synthesize polymeric systems for safe and efficient delivery of biologics. However, the application of polymeric delivery systems is often limited by problems such as harsh reaction conditions, low drug sequestration efficiency, and difficult drug release regulation. This study was aimed at developing a superporous material system with a hydrogel and an aptamer to overcome these challenges. The results have shown that the superporous hydrogel is capable of instantaneously and fully sequestering a large amount of growth factors, owing to the presence of superporous architectures and aptamers. Moreover, the sequestering and loading procedure does not involve any harsh conditions. The release kinetics of growth factors can be molecularly modulated by either changing the binding affinity of the aptamer or by using a triggering effector. Therefore, this study presents a promising superporous material for the delivery of highly potent biologics such as growth factors for clinical applications.
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Affiliation(s)
- Mark R Battig
- Department of Biomedical Engineering, The Pennsylvania State University, University Park, PA 16802-6804, USA
| | - Yike Huang
- Department of Biomedical Engineering, The Pennsylvania State University, University Park, PA 16802-6804, USA
| | - Niancao Chen
- Department of Biomedical Engineering, The Pennsylvania State University, University Park, PA 16802-6804, USA
| | - Yong Wang
- Department of Biomedical Engineering, The Pennsylvania State University, University Park, PA 16802-6804, USA.
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Gupta KC, Haider A, Choi YR, Kang IK. Nanofibrous scaffolds in biomedical applications. Biomater Res 2014; 18:5. [PMID: 26331056 PMCID: PMC4549138 DOI: 10.1186/2055-7124-18-5] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2014] [Accepted: 06/04/2014] [Indexed: 01/26/2023] Open
Abstract
Nanofibrous scaffolds are artificial extracellular matrices which provide natural environment for tissue formation. In comparison to other forms of scaffolds, the nanofibrous scaffolds promote cell adhesion, proliferation and differentiation more efficiently due to having high surface to volume ratio. Although scaffolds for tissue engineering have been fabricated by various techniques but electrospun nanofibrous scaffolds have shown great potential in the fields of tissue engineering and regeneration. This review highlights the applications and importance of electrospun nanofibrous scaffolds in various fields of biomedical applications ranging from drug delivery to wound healing. Attempts have also been made to highlights the advantages and disadvantages of nanofirbous scaffolds fabricated for biomedical applications using technique of electrospinning. The role of various factors controlling drug distribution in electrospun nanofibrous scaffolds is also discussed to increase the therapeutic efficiency of nanofibrous scaffolds in wound healing and drug delivery applications.
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Affiliation(s)
- Kailash Chandra Gupta
- Department of Polymer Science and Engineering, Kyungpook National University, Daegu, 702-701 South Korea ; Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667 India
| | - Adnan Haider
- Department of Polymer Science and Engineering, Kyungpook National University, Daegu, 702-701 South Korea
| | - Yu-Ri Choi
- Department of Polymer Science and Engineering, Kyungpook National University, Daegu, 702-701 South Korea
| | - Inn-Kyu Kang
- Department of Polymer Science and Engineering, Kyungpook National University, Daegu, 702-701 South Korea
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Braghirolli DI, Steffens D, Pranke P. Electrospinning for regenerative medicine: a review of the main topics. Drug Discov Today 2014; 19:743-53. [DOI: 10.1016/j.drudis.2014.03.024] [Citation(s) in RCA: 157] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Revised: 03/06/2014] [Accepted: 03/27/2014] [Indexed: 12/20/2022]
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Mulyasasmita W, Cai L, Hori Y, Heilshorn SC. Avidity-controlled delivery of angiogenic peptides from injectable molecular-recognition hydrogels. Tissue Eng Part A 2014; 20:2102-14. [PMID: 24490588 DOI: 10.1089/ten.tea.2013.0357] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Peptide mimics of growth factors represent an emerging class of therapeutic drugs due to high biological specificity and relative ease of synthesis. However, maintaining efficacious therapeutic dosage at the therapy site has proven challenging owing to poor intestinal permeability and short circulating half-lives in the blood stream. In this work, we present the affinity immobilization and controlled release of QK, a vascular endothelial growth factor (VEGF) mimetic peptide, from an injectable mixing-induced two-component hydrogel (MITCH). The MITCH system is crosslinked by reversible interactions between WW domains and complementary proline-rich peptide modules. Fusion of the QK peptide to either one or two units of the proline-rich sequence creates bifunctional peptide conjugates capable of specific binding to MITCH while preserving their angiogenic bioactivity. Presenting two repeats of the proline-rich sequence increases the binding enthalpy 2.5 times due to avidity effects. Mixing of the drug conjugates with MITCH components results in drug encapsulation and extended release at rates consistent with the affinity immobilization strength. Human umbilical vein endothelial cells (HUVECs) treated with the soluble drug conjugates exhibit morphogenetic events of VEGF receptor 2 signal transduction followed by cell migration and organization into networks characteristic of early angiogenesis. In a three-dimensional model where HUVECs were cultured as spheroids in a matrix of collagen and fibronectin, injection of drug-releasing MITCH resulted in significantly more cell outgrowth than drugs injected in saline. This ability to sustain local drug availability is ideal for therapeutic angiogenesis applications, where spatiotemporal control over drug distribution is a key requirement for clinical success.
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Affiliation(s)
- Widya Mulyasasmita
- 1 Department of Bioengineering, Stanford University , Stanford, California
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Cheng L, Sun X, Li B, Hu C, Yang H, Zhang Y, Cui W. Electrospun Ginsenoside Rg3/poly(lactic-co-glycolic acid) fibers coated with hyaluronic acid for repairing and inhibiting hypertrophic scars. J Mater Chem B 2013; 1:4428-4437. [DOI: 10.1039/c3tb20441c] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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