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Annaji M, Mita N, Poudel I, Boddu SHS, Fasina O, Babu RJ. Three-Dimensional Printing of Drug-Eluting Implantable PLGA Scaffolds for Bone Regeneration. Bioengineering (Basel) 2024; 11:259. [PMID: 38534533 DOI: 10.3390/bioengineering11030259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 02/29/2024] [Accepted: 03/04/2024] [Indexed: 03/28/2024] Open
Abstract
Despite rapid progress in tissue engineering, the repair and regeneration of bone defects remains challenging, especially for non-homogenous and complicated defects. We have developed and characterized biodegradable drug-eluting scaffolds for bone regeneration utilizing direct powder extrusion-based three-dimensional (3D) printing techniques. The PLGA scaffolds were fabricated using poly (lactic-co-glycolic acid) (PLGA) with inherent viscosities of 0.2 dl/g and 0.4 dl/g and ketoprofen. The effect of parameters such as the infill, geometry, and wall thickness of the drug carrier on the release kinetics of ketoprofen was studied. The release studies revealed that infill density significantly impacts the release performance, where 10% infill showed faster and almost complete release of the drug, whereas 50% infill demonstrated a sustained release. The Korsmeyer-Peppas model showed the best fit for release data irrespective of the PLGA molecular weight and infill density. It was demonstrated that printing parameters such as infill density, scaffold wall thickness, and geometry played an important role in controlling the release and, therefore, in designing customized drug-eluting scaffolds for bone regeneration.
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Affiliation(s)
- Manjusha Annaji
- Department of Drug Discovery and Development, Harrison College of Pharmacy, Auburn University, Auburn, AL 36849, USA
| | - Nur Mita
- Department of Drug Discovery and Development, Harrison College of Pharmacy, Auburn University, Auburn, AL 36849, USA
- Faculty of Pharmacy, Mulawarman University, Samarinda, Kalimantan Timur 75119, Indonesia
| | - Ishwor Poudel
- Department of Drug Discovery and Development, Harrison College of Pharmacy, Auburn University, Auburn, AL 36849, USA
| | - Sai H S Boddu
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, Ajman University, Ajman P.O. Box 346, United Arab Emirates
- Center of Medical and Bio-Allied Health Sciences Research, Ajman University, Ajman P.O. Box 346, United Arab Emirates
| | - Oladiran Fasina
- Department of Biosystems Engineering, Samuel Ginn College of Engineering, Auburn University, Auburn, AL 36849, USA
| | - R Jayachandra Babu
- Department of Drug Discovery and Development, Harrison College of Pharmacy, Auburn University, Auburn, AL 36849, USA
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El Khatib M, Russo V, Prencipe G, Mauro A, Wyrwa R, Grimm G, Di Mattia M, Berardinelli P, Schnabelrauch M, Barboni B. Amniotic Epithelial Stem Cells Counteract Acidic Degradation By-Products of Electrospun PLGA Scaffold by Improving Their Immunomodulatory Profile In Vitro. Cells 2021; 10:cells10113221. [PMID: 34831443 PMCID: PMC8623927 DOI: 10.3390/cells10113221] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 11/12/2021] [Accepted: 11/16/2021] [Indexed: 12/25/2022] Open
Abstract
Electrospun poly(lactic-co-glycolic acid) (PLGA) scaffolds with highly aligned fibers (ha-PLGA) represent promising materials in the field of tendon tissue engineering (TE) due to their characteristics in mimicking fibrous extracellular matrix (ECM) of tendon native tissue. Among these properties, scaffold biodegradability must be controlled allowing its replacement by a neo-formed native tendon tissue in a controlled manner. In this study, ha-PLGA were subjected to hydrolytic degradation up to 20 weeks, under di-H2O and PBS conditions according to ISO 10993-13:2010. These were then characterized for their physical, morphological, and mechanical features. In vitro cytotoxicity tests were conducted on ovine amniotic epithelial stem cells (oAECs), up to 7 days, to assess the effect of non-buffered and buffered PLGA by-products at different concentrations on cell viability and their stimuli on oAECs’ immunomodulatory properties. The ha-PLGA scaffolds degraded slowly as evidenced by a slight decrease in mass loss (14%) and average molecular weight (35%), with estimated degradation half-time of about 40 weeks under di-H2O. The ultrastructure morphology of the scaffolds showed no significant fiber degradation even after 20 weeks, but alteration of fiber alignment was already evident at week 1. Moreover, mechanical properties decreased throughout the degradation times under wet as well as dry PBS conditions. The influence of acid degradation media on oAECs was dose-dependent, with a considerable effect at 7 days’ culture point. This effect was notably reduced by using buffered media. To a certain level, cells were able to compensate the generated inflammation-like microenvironment by upregulating IL-10 gene expression and favoring an anti-inflammatory rather than pro-inflammatory response. These in vitro results are essential to better understand the degradation behavior of ha-PLGA in vivo and the effect of their degradation by-products on affecting cell performance. Indeed, buffering the degradation milieu could represent a promising strategy to balance scaffold degradation. These findings give good hope with reference to the in vivo condition characterized by physiological buffering systems.
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Affiliation(s)
- Mohammad El Khatib
- Unit of Basic and Applied Biosciences, Faculty of Bioscience and Agro-Food and Environmental Technology, University of Teramo, 64100 Teramo, Italy; (M.E.K.); (V.R.); (A.M.); (M.D.M.); (P.B.); (B.B.)
| | - Valentina Russo
- Unit of Basic and Applied Biosciences, Faculty of Bioscience and Agro-Food and Environmental Technology, University of Teramo, 64100 Teramo, Italy; (M.E.K.); (V.R.); (A.M.); (M.D.M.); (P.B.); (B.B.)
| | - Giuseppe Prencipe
- Unit of Basic and Applied Biosciences, Faculty of Bioscience and Agro-Food and Environmental Technology, University of Teramo, 64100 Teramo, Italy; (M.E.K.); (V.R.); (A.M.); (M.D.M.); (P.B.); (B.B.)
- Correspondence:
| | - Annunziata Mauro
- Unit of Basic and Applied Biosciences, Faculty of Bioscience and Agro-Food and Environmental Technology, University of Teramo, 64100 Teramo, Italy; (M.E.K.); (V.R.); (A.M.); (M.D.M.); (P.B.); (B.B.)
| | - Ralf Wyrwa
- Department of Biomaterials, INNOVENT e.V., 07745 Jena, Germany; (R.W.); (G.G.); (M.S.)
| | - Gabriele Grimm
- Department of Biomaterials, INNOVENT e.V., 07745 Jena, Germany; (R.W.); (G.G.); (M.S.)
| | - Miriam Di Mattia
- Unit of Basic and Applied Biosciences, Faculty of Bioscience and Agro-Food and Environmental Technology, University of Teramo, 64100 Teramo, Italy; (M.E.K.); (V.R.); (A.M.); (M.D.M.); (P.B.); (B.B.)
| | - Paolo Berardinelli
- Unit of Basic and Applied Biosciences, Faculty of Bioscience and Agro-Food and Environmental Technology, University of Teramo, 64100 Teramo, Italy; (M.E.K.); (V.R.); (A.M.); (M.D.M.); (P.B.); (B.B.)
| | | | - Barbara Barboni
- Unit of Basic and Applied Biosciences, Faculty of Bioscience and Agro-Food and Environmental Technology, University of Teramo, 64100 Teramo, Italy; (M.E.K.); (V.R.); (A.M.); (M.D.M.); (P.B.); (B.B.)
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Arriaga MA, Enriquez DM, Salinas AD, Garcia Jr. R, Trevino De Leo C, Lopez SA, Martirosyan KS, Chew SA. Application of iron oxide nanoparticles to control the release of minocycline for the treatment of glioblastoma. Future Med Chem 2021; 13:1833-1843. [PMID: 34545754 PMCID: PMC8525315 DOI: 10.4155/fmc-2021-0098] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Accepted: 08/09/2021] [Indexed: 01/02/2023] Open
Abstract
Background: The utilization of iron oxide nanoparticles (Fe3O4 NPs) to control minocycline release rates from poly(lactic-co-glycolic acid) scaffolds fabricated from an easy/economical technique is presented. Results & methodology: A larger change in temperature and amount of minocycline released was observed for scaffolds with higher amounts of Fe3O4 NPs, demonstrating that nanoparticle concentration can control heat generation and minocycline release. Temperatures near a polymer's glass transition temperature can result in the polymer's chain becoming more mobile and thus increasing drug diffusion out of the scaffold. Elevated temperature and minocycline released from the scaffold can work synergistically to enhance glioblastoma cell death. Conclusion: This study suggests that Fe3O4 NPs are promising materials for controlling minocycline release from polymeric scaffolds by magnetic hyperthermia for the treatment of glioblastoma.
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Affiliation(s)
- Marco A Arriaga
- Department of Health & Biomedical Sciences, University of Texas Rio Grande Valley, Brownsville, TX 78520, USA
| | - Dean Michael Enriquez
- Department of Health & Biomedical Sciences, University of Texas Rio Grande Valley, Brownsville, TX 78520, USA
| | - Arely D Salinas
- Department of Health & Biomedical Sciences, University of Texas Rio Grande Valley, Brownsville, TX 78520, USA
| | - Romeo Garcia Jr.
- Department of Health & Biomedical Sciences, University of Texas Rio Grande Valley, Brownsville, TX 78520, USA
| | - Carlos Trevino De Leo
- Department of Physics & Astronomy, University of Texas Rio Grande Valley, Brownsville, TX 78520, USA
| | - Silverio A Lopez
- Department of Physics & Astronomy, University of Texas Rio Grande Valley, Brownsville, TX 78520, USA
| | - Karen S Martirosyan
- Department of Physics & Astronomy, University of Texas Rio Grande Valley, Brownsville, TX 78520, USA
| | - Sue Anne Chew
- Department of Health & Biomedical Sciences, University of Texas Rio Grande Valley, Brownsville, TX 78520, USA
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Srinivasan S, Elizabeth Babensee J. Dendritic cells support a proliferative antigen-specific T-cell response in the presence of poly(lactic-co-glycolic acid). J Biomed Mater Res A 2021; 109:2269-2279. [PMID: 33960123 DOI: 10.1002/jbm.a.37211] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Revised: 04/15/2021] [Accepted: 04/23/2021] [Indexed: 12/31/2022]
Abstract
Biomaterials are known to modulate immune cell functions, which subsequently determine the host inflammatory and immune responses. Poly(lactic-co-glycolic acid) or PLGA, a biodegradable and biocompatible biomaterial, induces a pro-inflammatory, mature phenotype in antigen presentation cells, namely dendritic cells (DCs) in vitro. In vivo, PLGA can boost the humoral immune response to a co-delivered model antigen, a phenomenon known as the PLGA-adjuvant effect. This study elucidates the link between PLGA's effect on the DC phenotype in vitro and its adjuvant effect in vivo using the CD11c-DTR mouse model. These mice undergo conditional ablation of DCs upon treatment with diphtheria toxin. To measure immune activation, the mice were first given ovalbumin (OVA)-reactive T cells from OT-II/OT-I mice. Later, the same mice received subcutaneous OVA-loaded PLGA scaffold implants. In response to the scaffold implants, OVA-reactive OT-II CD4+ T cells showed decreased proliferation in the absence of CD11c+ DCs, indicating an attenuation of the PLGA-adjuvant effect. Furthermore, PLGA may also influence the antigen cross-presentation function of DCs, as evident with the lowered OVA-reactive OT-I CD8+ T-cell response. Understanding the immunomodulatory ability of biomaterials in the context of DCs will aid in designing improved DC-based immunotherapies against infectious diseases and cancer.
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Affiliation(s)
- Sangeetha Srinivasan
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia, USA
| | - Julia Elizabeth Babensee
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia, USA.,Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia, USA
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Buzmakov AV, Dunaev AG, Krivonosov YS, Zolotov DA, Dyachkova IG, Krotova LI, Volkov VV, Bodey AJ, Asadchikov VE, Popov VK. Wide-Ranging Multitool Study of Structure and Porosity of PLGA Scaffolds for Tissue Engineering. Polymers (Basel) 2021; 13:polym13071021. [PMID: 33806130 PMCID: PMC8037117 DOI: 10.3390/polym13071021] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 03/19/2021] [Accepted: 03/23/2021] [Indexed: 01/14/2023] Open
Abstract
In this study, the nanoscale transformation of the polylactic-co-glycolic acid (PLGA) internal structure, before and after its supercritical carbon dioxide (sc-CO2) swelling and plasticization, followed by foaming after a CO2 pressure drop, was studied by small-angle X-ray scattering (SAXS) for the first time. A comparative analysis of the internal structure data and porosity measurements for PLGA scaffolds, produced by sc-CO2 processing, on a scale ranging from 0.02 to 1000 μm, was performed by SAXS, helium pycnometry (HP), mercury intrusion porosimetry (MIP) and both “lab-source” and synchrotron X-ray microtomography (micro-CT). This approach opens up possibilities for the wide-scale evaluation, computer modeling, and prediction of the physical and mechanical properties of PLGA scaffolds, as well as their biodegradation behavior in the body. Hence, this study targets optimizing the process parameters of PLGA scaffold fabrication for specific biomedical applications.
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Affiliation(s)
- Alexey V. Buzmakov
- Institute of Photon Technologies of Federal Scientific Research Centre “Crystallography and Photonics” of Russian Academy of Sciences, Pionerskaya 2, Troitsk, 108840 Moscow, Russia; (A.V.B.); (A.G.D.); (Y.S.K.); (D.A.Z.); (L.I.K.); (V.V.V.); (V.E.A.)
| | - Andrey G. Dunaev
- Institute of Photon Technologies of Federal Scientific Research Centre “Crystallography and Photonics” of Russian Academy of Sciences, Pionerskaya 2, Troitsk, 108840 Moscow, Russia; (A.V.B.); (A.G.D.); (Y.S.K.); (D.A.Z.); (L.I.K.); (V.V.V.); (V.E.A.)
| | - Yuriy S. Krivonosov
- Institute of Photon Technologies of Federal Scientific Research Centre “Crystallography and Photonics” of Russian Academy of Sciences, Pionerskaya 2, Troitsk, 108840 Moscow, Russia; (A.V.B.); (A.G.D.); (Y.S.K.); (D.A.Z.); (L.I.K.); (V.V.V.); (V.E.A.)
| | - Denis A. Zolotov
- Institute of Photon Technologies of Federal Scientific Research Centre “Crystallography and Photonics” of Russian Academy of Sciences, Pionerskaya 2, Troitsk, 108840 Moscow, Russia; (A.V.B.); (A.G.D.); (Y.S.K.); (D.A.Z.); (L.I.K.); (V.V.V.); (V.E.A.)
| | - Irina G. Dyachkova
- Institute of Photon Technologies of Federal Scientific Research Centre “Crystallography and Photonics” of Russian Academy of Sciences, Pionerskaya 2, Troitsk, 108840 Moscow, Russia; (A.V.B.); (A.G.D.); (Y.S.K.); (D.A.Z.); (L.I.K.); (V.V.V.); (V.E.A.)
- Correspondence: (I.G.D.); (V.K.P.)
| | - Larisa I. Krotova
- Institute of Photon Technologies of Federal Scientific Research Centre “Crystallography and Photonics” of Russian Academy of Sciences, Pionerskaya 2, Troitsk, 108840 Moscow, Russia; (A.V.B.); (A.G.D.); (Y.S.K.); (D.A.Z.); (L.I.K.); (V.V.V.); (V.E.A.)
| | - Vladimir V. Volkov
- Institute of Photon Technologies of Federal Scientific Research Centre “Crystallography and Photonics” of Russian Academy of Sciences, Pionerskaya 2, Troitsk, 108840 Moscow, Russia; (A.V.B.); (A.G.D.); (Y.S.K.); (D.A.Z.); (L.I.K.); (V.V.V.); (V.E.A.)
| | - Andrew J. Bodey
- Diamond Light Source, Harwell Oxford Campus, Didcot OX11 0DE, UK;
| | - Victor E. Asadchikov
- Institute of Photon Technologies of Federal Scientific Research Centre “Crystallography and Photonics” of Russian Academy of Sciences, Pionerskaya 2, Troitsk, 108840 Moscow, Russia; (A.V.B.); (A.G.D.); (Y.S.K.); (D.A.Z.); (L.I.K.); (V.V.V.); (V.E.A.)
| | - Vladimir K. Popov
- Institute of Photon Technologies of Federal Scientific Research Centre “Crystallography and Photonics” of Russian Academy of Sciences, Pionerskaya 2, Troitsk, 108840 Moscow, Russia; (A.V.B.); (A.G.D.); (Y.S.K.); (D.A.Z.); (L.I.K.); (V.V.V.); (V.E.A.)
- Correspondence: (I.G.D.); (V.K.P.)
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Chen P, Cui L, Chen G, You T, Li W, Zuo J, Wang C, Zhang W, Jiang C. The application of BMP-12-overexpressing mesenchymal stem cells loaded 3D-printed PLGA scaffolds in rabbit rotator cuff repair. Int J Biol Macromol 2019; 138:79-88. [PMID: 31295489 DOI: 10.1016/j.ijbiomac.2019.07.041] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 07/04/2019] [Accepted: 07/06/2019] [Indexed: 02/06/2023]
Abstract
This study investigates if the application of bone marrow-derived mesenchymal stem cells (BM-MSCs) loaded 3D-printed scaffolds could improve rotator cuff repair. The polylactic-co-glycolic acid (PLGA) scaffolds were fabricated by 3D print technology. Rabbit BM-MSCs were transfected with a recombinant adenovirus encoding bone morphogenic protein 12 (BMP-12). The effect of BM-MSCs loaded PLGA scaffolds on tendon-bone healing was assessed by biomechanical testing and histological analysis in a rabbit rotator cuff repair model. We found that the PLGA scaffolds had good biocompatible and biodegradable property. Overexpression of BMP-12 increased the mRNA and protein expression of tenogenic genes in BM-MSCs cultured with DMEM medium and seeded in PLGA scaffolds. When BMP-12-overexpressing BM-MSCs-loaded PLGA scaffolds were implanted into the injured rabbit supraspinatus tendon-bone junctions, the tendon-bone healing was improved. Our results suggest that application of BMP-12 overexpressing BM-MSCs loaded 3D-printed PLGA scaffolds promote the healing of tendon-bone interface, improve collagen organization and increase fibrocartilage in the rabbit rotor cuff repair. Rotator cuff regeneration achieved by BMP-12-overexpressing BM-MSCs-loaded PLGA scaffolds may represent a novel approach for the management of rotator cuff defect.
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Affiliation(s)
- Peng Chen
- Department of Sports Medicine, Peking University Shenzhen Hospital, 518000 Shenzhen, China
| | - Lei Cui
- First Clinical Medical College of Anhui Medical University, 230000 Hefei, China
| | - Guofei Chen
- Department of Orthopedics, Shenzhen Guangming New District People's Hospital, 518000 Shenzhen, China
| | - Tian You
- Department of Sports Medicine, Peking University Shenzhen Hospital, 518000 Shenzhen, China
| | - Wei Li
- Department of Sports Medicine, Peking University Shenzhen Hospital, 518000 Shenzhen, China
| | - Jianwei Zuo
- Department of Sports Medicine, Peking University Shenzhen Hospital, 518000 Shenzhen, China
| | - Chen Wang
- First Clinical Medical College of Anhui Medical University, 230000 Hefei, China
| | - Wentao Zhang
- Department of Sports Medicine, Peking University Shenzhen Hospital, 518000 Shenzhen, China
| | - Changqing Jiang
- Department of Sports Medicine, Peking University Shenzhen Hospital, 518000 Shenzhen, China.
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Wang HC, Lin TH, Chang NJ, Hsu HC, Yeh ML. Continuous Passive Motion Promotes and Maintains Chondrogenesis in Autologous Endothelial Progenitor Cell-Loaded Porous PLGA Scaffolds during Osteochondral Defect Repair in a Rabbit Model. Int J Mol Sci 2019; 20:E259. [PMID: 30634691 DOI: 10.3390/ijms20020259] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 12/27/2018] [Accepted: 01/02/2019] [Indexed: 11/19/2022] Open
Abstract
Continuous passive motion (CPM) is widely used after total knee replacement. In this study, we investigated the effect of CPM combined with cell-based construct-transplantation in osteochondral tissue engineering. We created osteochondral defects (3 mm in diameter and 3 mm in depth) in the medial femoral condyle of 36 knees and randomized them into three groups: ED (empty defect), EPC/PLGA (endothelial progenitor cells (EPCs) seeded in the poly lactic-co-glycolic acid (PLGA) scaffold), or EPC/PLGA/CPM (EPC/PLGA scaffold complemented with CPM starting one day after transplantation). We investigated the effects of CPM and the EPC/PLGA constructs on tissue restoration in weight-bearing sites by histological observation and micro-computed tomography (micro-CT) evaluation 4 and 12 weeks after implantation. After CPM, the EPC/PLGA construct exhibited early osteochondral regeneration and prevention of subchondral bone overgrowth and cartilage degeneration. CPM did not alter the microenvironment created by the construct; it up-regulated the expression of the extracellular matrix components (glycosaminoglycan and collagen), down-regulated bone formation, and induced the biosynthesis of lubricin, which appeared in the EPC/PLGA/CPM group after 12 weeks. CPM can provide promoting signals during osteochondral tissue engineering and achieve a synergistic effect when combined with EPC/PLGA transplantation, so it should be considered a non-invasive treatment to be adopted in clinical practices.
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Chew SA, Arriaga MA, Hinojosa VA. Effects of surface area to volume ratio of PLGA scaffolds with different architectures on scaffold degradation characteristics and drug release kinetics. J Biomed Mater Res A 2016; 104:1202-11. [PMID: 26780154 DOI: 10.1002/jbm.a.35657] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Revised: 11/18/2015] [Accepted: 01/13/2016] [Indexed: 11/08/2022]
Abstract
In this work, PLGA scaffolds with different architectures were fabricated to investigate the effects of surface area to volume ratio (SVR) (which resulted from the different architectures) on scaffold degradation characteristics and drug release kinetics with minocycline as the model drug. It was hypothesized that the thin strand scaffolds, which had the highest SVR, would degrade faster than the thick strand and globular scaffolds as the increase in surface area will allow more contact between water molecules and degradable ester groups in the polymer. However, it was found that globular scaffolds, which had the lowest SVR, resulted in the fastest degradation which demonstrated that the amount of degradation of the scaffolds does not only depend on the SVR but also on other factors such as the retention of acidic degradation byproducts in the scaffold and scaffold porosity. PLGA 50 : 50 globular scaffolds resulted in a biphasic release profile, with a burst release in the beginning and the middle of the release study which may be beneficial for some drug delivery applications. A clear correlation between SVR and release rates was not observed, indicating that besides the availability of more surface area for drug to diffuse out of the polymer matrix, other factors such as amount of scaffold degradation and scaffold porosity may play a role in determining drug release kinetics. Further studies, such as scanning electron microscopy, need to be performed in the future to further evaluate the porosity, morphology and structure of the scaffolds.
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Affiliation(s)
- Sue Anne Chew
- Department of Health and Biomedical Sciences, University of Texas Rio Grande Valley, One West University Blvd, Brownsville, Texas, 78520
| | - Marco A Arriaga
- Department of Health and Biomedical Sciences, University of Texas Rio Grande Valley, One West University Blvd, Brownsville, Texas, 78520
| | - Victor A Hinojosa
- Department of Health and Biomedical Sciences, University of Texas Rio Grande Valley, One West University Blvd, Brownsville, Texas, 78520
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Choi SK, Park JK, Lee KM, Lee SK, Jeon WB. Improved neural progenitor cell proliferation and differentiation on poly(lactide-co-glycolide) scaffolds coated with elastin-like polypeptide. J Biomed Mater Res B Appl Biomater 2013; 101:1329-39. [PMID: 23687069 DOI: 10.1002/jbm.b.32950] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2012] [Revised: 02/14/2013] [Accepted: 03/06/2013] [Indexed: 11/11/2022]
Abstract
Poly(lactide-co-glycolide) (PLGA) and elastin-like polypeptide (ELP) have been widely used as a biodegradable scaffold and thermoresponsive matrix, respectively. However, little attention has focused on the combinatorial use of these biomaterials for tissue engineering applications. An ELP matrix TGPG[VGRGD(VGVPG)6]20WPC (referred to as REP) contains multiple Arg-Gly-Asp motifs. This study fabricated porous PLGA scaffolds coated with various concentration of matrix via thermally induced phase transition to improve adhesion-mediated proliferation and differentiation of neural progenitor cells. Matrix-coated scaffolds were characterized by FTIR, SEM, and hematoxylin and eosin staining with respect to coating efficiency, porosity, and pore size and shape. On the matrix-coated scaffolds, cells grew as a single cell or associated each other to form a multicellular layer or cluster. In biological evaluations, cell adhesion and proliferation were significantly promoted in a matrix concentration-dependent manner. More importantly, in combination with retinoic acid, the differentiation of progenitor cells into neuronal and astroglial lineages was highly stimulated in the cells cultured on matrix-coated scaffolds than on untreated controls. Taken together, our results indicated that the REP matrix-functionalized PLGA scaffolds are suitable for improving neuronal cell functions, and thus applicable for neural tissue engineering.
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Affiliation(s)
- Seong-Kyoon Choi
- Laboratory of Biochemistry and Cellular Engineering, Division of NanoBio Technology, Daegu Gyeongbuk Institute of Science and Technology, Daegu, 711-873, South Korea
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