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Naik K, du Toit LC, Ally N, Choonara YE. In vivo evaluation of a Nano-enabled therapeutic vitreous substitute for the precise delivery of triamcinolone to the posterior segment of the eye. Drug Deliv Transl Res 2024; 14:2668-2694. [PMID: 38519828 PMCID: PMC11384602 DOI: 10.1007/s13346-024-01566-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/26/2024] [Indexed: 03/25/2024]
Abstract
This study focused on the design of a thermoresponsive, nano-enabled vitreous substitute for the treatment of retinal diseases. Synthesis of a hydrogel composed of hyaluronic acid and a poloxamer blend was undertaken. Poly(D,L-lactide-co-glycolide) acid nanoparticles encapsulating triamcinolone acetonide (TA) were synthesised with a spherical morphology and mean diameter of ~ 153 nm. Hydrogel fabrication and nanoparticle loading within the hydrogel was confirmed via physicochemical analysis. Gelation studies indicated that hydrogels formed in nine minutes and 10 min for the unloaded and nanoparticle-loaded hydrogels, respectively. The hydrogels displayed in situ gel formation properties, and rheometric viscoelastic studies indicated the unloaded and loaded hydrogels to have modulus values similar to those of the natural vitreous at 37 °C. Administration of the hydrogels was possible via 26G needles allowing for clinical application and drug release of triamcinolone acetonide from the nanoparticle-loaded hydrogel, which provided sustained in vitro drug release over nine weeks. The hydrogels displayed minimal swelling, reaching equilibrium swelling within 12 h for the unloaded hydrogel, and eight hours for the nanoparticle-loaded hydrogel. Biodegradation in simulated vitreous humour with lysozyme showed < 20% degradation within nine weeks. Biocompatibility of both unloaded and loaded hydrogels was shown with mouse fibroblast and human retinal pigment epithelium cell lines. Lastly, a pilot in vivo study in a New Zealand White rabbit model displayed minimal toxicity with precise, localised drug release behaviour, and ocular TA levels maintained within the therapeutic window for the 28-day investigation period, which supports the potential applicability of the unloaded and nanoparticle-loaded hydrogels as vitreous substitutes that function as drug delivery systems following vitrectomy surgery.
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Affiliation(s)
- Kruti Naik
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Johannesburg, Parktown, 2193, South Africa
| | - Lisa Claire du Toit
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Johannesburg, Parktown, 2193, South Africa
| | - Naseer Ally
- Division of Ophthalmology, Department of Neurosciences, School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Johannesburg, Parktown, 2193, South Africa
| | - Yahya Essop Choonara
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Johannesburg, Parktown, 2193, South Africa.
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Fang W, Song T, Wang L, Han T, Xiang Z, Rojas OJ. Influence of formic acid esterified cellulose nanofibrils on compressive strength, resilience and thermal stability of polyvinyl alcohol-xylan hydrogel. Carbohydr Polym 2023; 308:120663. [PMID: 36813346 DOI: 10.1016/j.carbpol.2023.120663] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 01/11/2023] [Accepted: 02/01/2023] [Indexed: 02/07/2023]
Abstract
Having competitive compressive strength and resilience as well as biocompatibility simultaneously still remains a challenge for composite hydrogels, which is critical if they are aimed for use as functional biomaterials. In the present work, a facile and green method was designed for producing a composite hydrogel based on polyvinyl alcohol (PVA) and xylan with sodium tri-metaphosphate (STMP) as cross-linker, aiming to specially enhance its compressive properties with the aid of eco-friendly produced formic acid esterified cellulose nanofibrils (CNFs). The CNF addition caused a compressive strength decrease of the hydrogels, although the values (2.34-4.57 MPa at a compressive strain of 70 %) were still at a high level among the reported PVA (or polysaccharide) based hydrogels so far. However, the compressive resilience of the hydrogels was enhanced significantly by the CNF addition, with maximal compressive strength retention of 88.49 % and 99.67 % in height recovery after 1000 compression cycles at a strain of 30 %, which reflects the significant influence of CNFs on the compressive recovery ability of the hydrogel. All materials used in the present work are naturally non-toxic with good biocompatible, which makes the synthesized hydrogels with great potential in biomedical applications, e.g., soft-tissue engineering.
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Affiliation(s)
- Wei Fang
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangzhou Key Laboratory of Sensing Materials & Devices, Centre for Advanced Analytical Science, School of Chemistry and Chemical Engineering, c/o School of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China; Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangzhou 510006, PR China
| | - Tao Song
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangzhou 510006, PR China.
| | - Lisheng Wang
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangzhou Key Laboratory of Sensing Materials & Devices, Centre for Advanced Analytical Science, School of Chemistry and Chemical Engineering, c/o School of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China
| | - Tingting Han
- Guangzhou Key Laboratory of Sensing Materials & Devices, Centre for Advanced Analytical Science, School of Chemistry and Chemical Engineering, c/o School of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China.
| | - Zhouyang Xiang
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangzhou 510006, PR China
| | - Orlando J Rojas
- Bioproducts Institute, Department of Chemical & Biological Engineering, 2360 East Mall, The University of British Columbia, Vancouver, BC V6T 1Z3, Canada; Bioproducts Institute, Department of Chemistry, 2360 East Mall, The University of British Columbia, Vancouver, BC V6T 1Z3, Canada; Bioproducts Institute, Department of Wood Science, 2360 East Mall, The University of British Columbia, Vancouver, BC V6T 1Z3, Canada
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3
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Naik K, Du Toit LC, Ally N, Choonara YE. Advances in Polysaccharide- and Synthetic Polymer-Based Vitreous Substitutes. Pharmaceutics 2023; 15:566. [PMID: 36839888 PMCID: PMC9961338 DOI: 10.3390/pharmaceutics15020566] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 02/01/2023] [Accepted: 02/05/2023] [Indexed: 02/11/2023] Open
Abstract
The vitreous humour is a gel-like structure that composes the majority of each eye. It functions to provide passage of light, be a viscoelastic dampener, and hold the retina in place. Vitreous liquefaction causes retinal detachment and retinal tears requiring pars plana vitrectomy for vitreous substitution. An ideal vitreous substitute should display similar mechanical, chemical, and rheological properties to the natural vitreous. Currently used vitreous substitutes such as silicone oil, perfluorocarbon liquids, and gases cannot be used long-term due to adverse effects such as poor retention time, cytotoxicity, and cataract formation. Long-term, experimental vitreous substitutes composed of natural, modified and synthetic polymers are currently being studied. This review discusses current long- and short-term vitreous substitutes and the disadvantages of these that have highlighted the need for an ideal vitreous substitute. The review subsequently focuses specifically on currently used polysaccharide- and synthetic polymer-based vitreous substitutes, which may be modified or functionalised, or employed as the derivative, and discusses experimental vitreous substitutes in these classes. The advantages and challenges associated with the use of polymeric substitutes are discussed. Innovative approaches to vitreous substitution, namely a novel foldable capsular vitreous body, are presented, as well as future perspectives related to the advancement of this field.
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Affiliation(s)
- Kruti Naik
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown, Johannesburg 2193, South Africa
| | - Lisa C. Du Toit
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown, Johannesburg 2193, South Africa
| | - Naseer Ally
- Division of Ophthalmology, Department of Neurosciences, School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown, Johannesburg 2193, South Africa
| | - Yahya E. Choonara
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown, Johannesburg 2193, South Africa
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Confalonieri F, Josifovska N, Boix-Lemonche G, Stene-Johansen I, Bragadottir R, Lumi X, Petrovski G. Vitreous Substitutes from Bench to the Operating Room in a Translational Approach: Review and Future Endeavors in Vitreoretinal Surgery. Int J Mol Sci 2023; 24:3342. [PMID: 36834754 PMCID: PMC9961686 DOI: 10.3390/ijms24043342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 01/24/2023] [Accepted: 02/02/2023] [Indexed: 02/11/2023] Open
Abstract
Vitreous substitutes are indispensable tools in vitreoretinal surgery. The two crucial functions of these substitutes are their ability to displace intravitreal fluid from the retinal surface and to allow the retina to adhere to the retinal pigment epithelium. Today, vitreoretinal surgeons can choose among a plethora of vitreous tamponades, and the tamponade of choice might be difficult to determine in the ever-expanding range of possibilities for a favorable outcome. The currently available vitreous substitutes have disadvantages that need to be addressed to improve the surgical outcome achievable today. Herein, the fundamental physical and chemical proprieties of all vitreous substitutes are reported, and their use and clinical applications are described alongside some surgical techniques of intra-operative manipulation. The major upcoming developments in vitreous substitutes are extensively discussed, keeping a translational perspective throughout. Conclusions on future perspectives are derived through an in-depth analysis of what is lacking today in terms of desired outcomes and biomaterials technology.
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Affiliation(s)
- Filippo Confalonieri
- Department of Ophthalmology, Oslo University Hospital, Kirkeveien 166, 0450 Oslo, Norway
- Center for Eye Research and Innovative Diagnostics, Department of Ophthalmology, Institute for Clinical Medicine, University of Oslo, Kirkeveien 166, 0450 Oslo, Norway
- Department of Biomedical Sciences, Humanitas University, Via Rita Levi Montalcini 4, Pieve Emanuele, 20090 Milan, Italy
| | - Natasha Josifovska
- Center for Eye Research and Innovative Diagnostics, Department of Ophthalmology, Institute for Clinical Medicine, University of Oslo, Kirkeveien 166, 0450 Oslo, Norway
| | - Gerard Boix-Lemonche
- Center for Eye Research and Innovative Diagnostics, Department of Ophthalmology, Institute for Clinical Medicine, University of Oslo, Kirkeveien 166, 0450 Oslo, Norway
| | - Ingar Stene-Johansen
- Department of Ophthalmology, Oslo University Hospital, Kirkeveien 166, 0450 Oslo, Norway
| | - Ragnheidur Bragadottir
- Department of Ophthalmology, Oslo University Hospital, Kirkeveien 166, 0450 Oslo, Norway
- Center for Eye Research and Innovative Diagnostics, Department of Ophthalmology, Institute for Clinical Medicine, University of Oslo, Kirkeveien 166, 0450 Oslo, Norway
| | - Xhevat Lumi
- Center for Eye Research and Innovative Diagnostics, Department of Ophthalmology, Institute for Clinical Medicine, University of Oslo, Kirkeveien 166, 0450 Oslo, Norway
- Eye Hospital, University Medical Centre Ljubljana, Zaloška cesta 7, 1000 Ljubljana, Slovenia
| | - Goran Petrovski
- Department of Ophthalmology, Oslo University Hospital, Kirkeveien 166, 0450 Oslo, Norway
- Center for Eye Research and Innovative Diagnostics, Department of Ophthalmology, Institute for Clinical Medicine, University of Oslo, Kirkeveien 166, 0450 Oslo, Norway
- Department of Ophthalmology, University of Split School of Medicine and University Hospital Centre, 21000 Split, Croatia
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Saletti M, Paolino M, Ballerini L, Giuliani G, Leone G, Lamponi S, Andreassi M, Bonechi C, Donati A, Piovani D, Schieroni AG, Magnani A, Cappelli A. Click-Chemistry Cross-Linking of Hyaluronan Graft Copolymers. Pharmaceutics 2022; 14:pharmaceutics14051041. [PMID: 35631626 PMCID: PMC9146110 DOI: 10.3390/pharmaceutics14051041] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 05/04/2022] [Accepted: 05/07/2022] [Indexed: 01/27/2023] Open
Abstract
An easy and viable crosslinking procedure by click-chemistry (click-crosslinking) of hyaluronic acid (HA) was developed. In particular, the clickable propargyl groups of hyaluronane-based HA-FA-Pg graft copolymers showing low and medium molecular weight values were exploited in crosslinking by click-chemistry by using a hexa(ethylene glycol) spacer. The resulting HA-FA-HEG-CL materials showed an apparent lack of in vitro cytotoxic effects, tuneable water affinity, and rheological properties according to the crosslinking degree that suggests their applicability in different biomedical fields.
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Affiliation(s)
- Mario Saletti
- Dipartimento di Biotecnologie, Chimica e Farmacia (Dipartimento di Eccellenza 2018–2022), Università degli Studi di Siena, Via Aldo Moro 2, 53100 Siena, Italy; (M.S.); (L.B.); (G.G.); (G.L.); (S.L.); (M.A.); (C.B.); (A.D.); (A.M.)
| | - Marco Paolino
- Dipartimento di Biotecnologie, Chimica e Farmacia (Dipartimento di Eccellenza 2018–2022), Università degli Studi di Siena, Via Aldo Moro 2, 53100 Siena, Italy; (M.S.); (L.B.); (G.G.); (G.L.); (S.L.); (M.A.); (C.B.); (A.D.); (A.M.)
- Correspondence: (M.P.); (A.C.); Tel.: +39-0577-234320 (A.C.)
| | - Lavinia Ballerini
- Dipartimento di Biotecnologie, Chimica e Farmacia (Dipartimento di Eccellenza 2018–2022), Università degli Studi di Siena, Via Aldo Moro 2, 53100 Siena, Italy; (M.S.); (L.B.); (G.G.); (G.L.); (S.L.); (M.A.); (C.B.); (A.D.); (A.M.)
| | - Germano Giuliani
- Dipartimento di Biotecnologie, Chimica e Farmacia (Dipartimento di Eccellenza 2018–2022), Università degli Studi di Siena, Via Aldo Moro 2, 53100 Siena, Italy; (M.S.); (L.B.); (G.G.); (G.L.); (S.L.); (M.A.); (C.B.); (A.D.); (A.M.)
| | - Gemma Leone
- Dipartimento di Biotecnologie, Chimica e Farmacia (Dipartimento di Eccellenza 2018–2022), Università degli Studi di Siena, Via Aldo Moro 2, 53100 Siena, Italy; (M.S.); (L.B.); (G.G.); (G.L.); (S.L.); (M.A.); (C.B.); (A.D.); (A.M.)
| | - Stefania Lamponi
- Dipartimento di Biotecnologie, Chimica e Farmacia (Dipartimento di Eccellenza 2018–2022), Università degli Studi di Siena, Via Aldo Moro 2, 53100 Siena, Italy; (M.S.); (L.B.); (G.G.); (G.L.); (S.L.); (M.A.); (C.B.); (A.D.); (A.M.)
| | - Marco Andreassi
- Dipartimento di Biotecnologie, Chimica e Farmacia (Dipartimento di Eccellenza 2018–2022), Università degli Studi di Siena, Via Aldo Moro 2, 53100 Siena, Italy; (M.S.); (L.B.); (G.G.); (G.L.); (S.L.); (M.A.); (C.B.); (A.D.); (A.M.)
| | - Claudia Bonechi
- Dipartimento di Biotecnologie, Chimica e Farmacia (Dipartimento di Eccellenza 2018–2022), Università degli Studi di Siena, Via Aldo Moro 2, 53100 Siena, Italy; (M.S.); (L.B.); (G.G.); (G.L.); (S.L.); (M.A.); (C.B.); (A.D.); (A.M.)
| | - Alessandro Donati
- Dipartimento di Biotecnologie, Chimica e Farmacia (Dipartimento di Eccellenza 2018–2022), Università degli Studi di Siena, Via Aldo Moro 2, 53100 Siena, Italy; (M.S.); (L.B.); (G.G.); (G.L.); (S.L.); (M.A.); (C.B.); (A.D.); (A.M.)
| | - Daniele Piovani
- Istituto di Scienze e Tecnologie Chimiche “G. Natta”-SCITEC (CNR), Via A. Corti 12, 20133 Milano, Italy; (D.P.); (A.G.S.)
| | - Alberto Giacometti Schieroni
- Istituto di Scienze e Tecnologie Chimiche “G. Natta”-SCITEC (CNR), Via A. Corti 12, 20133 Milano, Italy; (D.P.); (A.G.S.)
| | - Agnese Magnani
- Dipartimento di Biotecnologie, Chimica e Farmacia (Dipartimento di Eccellenza 2018–2022), Università degli Studi di Siena, Via Aldo Moro 2, 53100 Siena, Italy; (M.S.); (L.B.); (G.G.); (G.L.); (S.L.); (M.A.); (C.B.); (A.D.); (A.M.)
| | - Andrea Cappelli
- Dipartimento di Biotecnologie, Chimica e Farmacia (Dipartimento di Eccellenza 2018–2022), Università degli Studi di Siena, Via Aldo Moro 2, 53100 Siena, Italy; (M.S.); (L.B.); (G.G.); (G.L.); (S.L.); (M.A.); (C.B.); (A.D.); (A.M.)
- Correspondence: (M.P.); (A.C.); Tel.: +39-0577-234320 (A.C.)
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Zhao D, Nuntanaranont T, Thuaksubun N, Meesane J. Osteo-conductive hydrogel scaffolds of poly(vinylalcohol) with silk fibroin particles for bone augmentation: Structural formation and in vitro testing. J BIOACT COMPAT POL 2021. [DOI: 10.1177/08839115211055720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Bone augmentation is an effective approach to treat patients who have bone loss at the maxillofacial area. In this research, osteo-conductive hydrogel scaffolds of poly(vinylalcohol) (PVA) with silk fibroin particles (SFP) were fabricated. The SFP were formed by dropping a solution of silk fibroin into acetone at different volume ratios (v/v) of silk to acetone: 1:3 (SFP-3), 1:6 (SFP-6), 1:12 (SFP-12), and 1:24 (SFP-24). The various SFP solutions were mixed with a PVA solution before fabrication into hydrogels by freeze-thawing. Afterwards, the hydrogels were freeze-dried to fabricate the scaffolds. The particle size and charge, molecular organization, and morphology of the SFP were characterized and observed with dynamic light scattering, Fourier transform infrared spectroscopy, differential scanning calorimetry, and scanning electron microscopy (SEM). The morphologies of the hydrogel scaffolds were observed with SEM. Swelling percentage was used to assess the swelling behavior of the hydrogel scaffolds. The mechanical properties were also tested. The scaffolds were cultured with osteoblast cells to test the biological performance, cell viability and performance, alkaline phosphatase activity, calcium deposition, and total protein. The SFP-24 was the smallest in particle size. PVA hydrogel scaffolds with SFP-24 demonstrated low particle aggregation, good particle distribution within the scaffold, and a lower swelling percentage. PVA hydrogel scaffolds with SFP had higher mechanical stability than scaffolds without the SFP. Furthermore, the PVA hydrogel scaffold with SFP-24 had better biological performance. Finally, the results demonstrated that PVA hydrogel scaffolds with SFP-24 showed good osteo-conductive performance which is promising for bone augmentation.
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Affiliation(s)
- Dan Zhao
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| | - Thongchai Nuntanaranont
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| | - Nuttawut Thuaksubun
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| | - Jirut Meesane
- Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla, Thailand
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Yadav I, Purohit SD, Singh H, Das N, Roy P, Mishra NC. A highly transparent tri-polymer complex in situhydrogel of HA, collagen and four-arm-PEG as potential vitreous substitute. Biomed Mater 2021; 16. [PMID: 34525462 DOI: 10.1088/1748-605x/ac2714] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 09/15/2021] [Indexed: 12/27/2022]
Abstract
There is a requirement of removal and replacement of vitreous for various ophthalmic diseases, e.g. retinopathy and retinal detachment. Clinical tamponades, e.g. silicone oil and fluorinated gases are used but limited due to their toxicity and some complications. A lot of polymer-based materials have been tested and proposed as vitreous substitute, but till date, there is no ideal vitreous substitute available. Thus, it requires to develop an improved vitreous substitute which will be highly suitable for vitreous replacement. We have developed tri-polymer complexin situhydrogels by crosslinking among hyaluronic acid (HA), collagen (Coll) and four-arm-polyethylene glycol (PEG). All the developed hydrogels are biocompatible with NIH 3T3 mouse fibroblast cells, having pH in the range 7-7.44 and refractive index in the range 1.333-1.345. The developed hydrogels are highly transparent, showing transmittance >97%. FTIR study shows that the hydrogel was crosslinked by amide bond formation between HA and PEG, and between Coll and PEG. The rheological study shows that all the developed hydrogels exhibit viscoelastic behavior and all the hydrogels have storage modulus values (>100 pa) which is greater than loss modulus values-indicating sufficient elasticity for vitreous application. The elastic nature of the hydrogel increases with the increase in PEG concentration. The gel is formed in between 2 and 3 min-indicating its applicationin situ. The viscosity of the developed hydrogels shows shear thinning behavior. The pre-gel solution of the hydrogel is injectable through a 22 G needle-indicating its applicationin situthrough vitrectomy surgery. All the hydrogels are hydrophilic and have water content of 96% approximately. Thus, the results show the positive properties for its application as a potential vitreous substitute.
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Affiliation(s)
- Indu Yadav
- Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Roorkee, India
| | - Shiv Dutt Purohit
- Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Roorkee, India
| | - Hemant Singh
- Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Roorkee, India
| | - Neeladrisingha Das
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India
| | - Partha Roy
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India
| | - Narayan Chandra Mishra
- Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Roorkee, India
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8
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de Oliveira RA, Muralha FP, Grupenmacher AT, de Araújo Morandim-Giannetti A, Bersanetti PA, Maia M, Magalhães Junior O. Biocompatibility of polyvinyl alcohol/trisodium trimetaphosphate as vitreous substitute in experimental vitrectomy model in rabbits. J Biomed Mater Res B Appl Biomater 2021; 110:460-466. [PMID: 34328263 DOI: 10.1002/jbm.b.34923] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 06/12/2021] [Accepted: 07/08/2021] [Indexed: 11/06/2022]
Abstract
Synthetic hydrogels have been proposed as vitreous substitutes recently. This study aims to evaluate the biocompatibility of polyvinyl alcohol (PVA) crosslinked with trisodium trimetaphosphate (SMTP) hydrogel in rabbit vitrectomized eyes. Seven animals were submitted to pars plana vitrectomy and the vitreous was replaced by PVA/SMTP hydrogel. Optical coherence tomography, fluorescein angiogram, clinical, and electrophysiological (ERG) examinations were analyzed at baseline, on postoperative days 7 and 30. The fellow eye was used as the control group. Hydrogel opacification was observed and ERG recordings were reduced in the hydrogel group in rod response, b-wave cone response and flicker. A histological analysis showed retinal disorganization, presence of multinucleated cells, and intraretinal hydrogel particles. The PVA/SMTP hydrogel showed poor biocompatibility. Novel biomaterials compounds should be analyzed in vivo.
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Affiliation(s)
- Ramon Antunes de Oliveira
- Department of Ophthalmology and Visual Sciences, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Felipe Picanço Muralha
- Department of Ophthalmology and Visual Sciences, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Alex Treiger Grupenmacher
- Department of Ophthalmology and Visual Sciences, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil
| | | | | | - Maurício Maia
- Department of Ophthalmology and Visual Sciences, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Octaviano Magalhães Junior
- Department of Ophthalmology and Visual Sciences, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil
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9
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Mondelo-García C, Bandín-Vilar E, García-Quintanilla L, Castro-Balado A, Del Amo EM, Gil-Martínez M, Blanco-Teijeiro MJ, González-Barcia M, Zarra-Ferro I, Fernández-Ferreiro A, Otero-Espinar FJ. Current Situation and Challenges in Vitreous Substitutes. Macromol Biosci 2021; 21:e2100066. [PMID: 33987966 DOI: 10.1002/mabi.202100066] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 04/23/2021] [Indexed: 12/11/2022]
Abstract
Vitreo-retinal disorders constitute a significant portion of treatable ocular diseases. These pathologies often require vitreo-retinal surgery and, as a consequence, the use of vitreous substitutes. Nowadays, the vitreous substitutes that are used in clinical practice are mainly divided into gases (air, SF6 , C2 F6 , C3 F8 ) and liquids (perfluorocarbon liquids, silicone oils, and heavy silicone oils). There are specific advantages and drawbacks to each of these, which determine their clinical indications. However, developing the ideal biomaterial for vitreous substitution continues to be one of the most important challenges in ophthalmology, and a multidisciplinary approach is required. In this sense, recent research has focused on the development of biocompatible, biodegradable, and injectable hydrogels (natural, synthetic, and smart), which also act as medium and long-term internal tamponade agents. This comprehensive review aims to cover the main characteristics and indications for use of the extensive range of vitreous substitutes that are currently used in clinical practice, before going on to describe the hydrogels that have been developed recently and which have emerged as promising biomaterials for vitreous substitution.
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Affiliation(s)
- Cristina Mondelo-García
- Pharmacy Department, University Clinical Hospital of Santiago de Compostela (SERGAS), Santiago de Compostela, 15706, Spain.,Pharmacology Group, Health Research Institute of Santiago de Compostela (FIDIS), Santiago de Compostela, 15706, Spain
| | - Enrique Bandín-Vilar
- Pharmacy Department, University Clinical Hospital of Santiago de Compostela (SERGAS), Santiago de Compostela, 15706, Spain.,Pharmacology Group, Health Research Institute of Santiago de Compostela (FIDIS), Santiago de Compostela, 15706, Spain
| | - Laura García-Quintanilla
- Pharmacy Department, University Clinical Hospital of Santiago de Compostela (SERGAS), Santiago de Compostela, 15706, Spain.,Pharmacology Group, Health Research Institute of Santiago de Compostela (FIDIS), Santiago de Compostela, 15706, Spain
| | - Ana Castro-Balado
- Pharmacy Department, University Clinical Hospital of Santiago de Compostela (SERGAS), Santiago de Compostela, 15706, Spain.,Pharmacology Group, Health Research Institute of Santiago de Compostela (FIDIS), Santiago de Compostela, 15706, Spain
| | - Eva M Del Amo
- School of Pharmacy, Faculty of Health Sciences, University of Eastern Finland, Kuopio, 70211, Finland
| | - María Gil-Martínez
- Ophthalmology Department, University Clinical Hospital of Santiago de Compostela (SERGAS), Santiago de Compostela, 15706, Spain
| | - María José Blanco-Teijeiro
- Ophthalmology Department, University Clinical Hospital of Santiago de Compostela (SERGAS), Santiago de Compostela, 15706, Spain
| | - Miguel González-Barcia
- Pharmacy Department, University Clinical Hospital of Santiago de Compostela (SERGAS), Santiago de Compostela, 15706, Spain.,Pharmacology Group, Health Research Institute of Santiago de Compostela (FIDIS), Santiago de Compostela, 15706, Spain
| | - Irene Zarra-Ferro
- Pharmacy Department, University Clinical Hospital of Santiago de Compostela (SERGAS), Santiago de Compostela, 15706, Spain.,Pharmacology Group, Health Research Institute of Santiago de Compostela (FIDIS), Santiago de Compostela, 15706, Spain
| | - Anxo Fernández-Ferreiro
- Pharmacy Department, University Clinical Hospital of Santiago de Compostela (SERGAS), Santiago de Compostela, 15706, Spain.,Pharmacology Group, Health Research Institute of Santiago de Compostela (FIDIS), Santiago de Compostela, 15706, Spain
| | - Francisco J Otero-Espinar
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology Faculty of Pharmacy, University of Santiago de Compostela (USC), Santiago de Compostela, 15782, Spain
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10
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Lamponi S, Baratto MC, Miraldi E, Baini G, Biagi M. Chemical Profile, Antioxidant, Anti-Proliferative, Anticoagulant and Mutagenic Effects of a Hydroalcoholic Extract of Tuscan Rosmarinus officinalis. PLANTS 2021; 10:plants10010097. [PMID: 33418860 PMCID: PMC7825123 DOI: 10.3390/plants10010097] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 12/25/2020] [Accepted: 12/31/2020] [Indexed: 11/16/2022]
Abstract
This study aimed to characterize the chemical profile of an ethanolic extract of Tuscan Rosmarinus officinalis (Roex) and to determine its in vitro bioactivity. The content of phenolic and flavonoid compounds, hydroxycinnamic acids and triterpenoids was determined, and high-performance liquid chromatography-diode array detection (HPLC-DAD) analysis revealed that rosmarinic acid and other hydroxycinnamic derivatives were the main constituents of the extract. Roex demonstrated to have both antioxidant activity and the capability to scavenge hydrogen peroxide in a concentration dependent manner. Moreover, NIH3T3 mouse fibroblasts and human breast adenocarcinoma cells MDA-MB-231 viability was influenced by the extract with an IC50 of 2.4 × 10-1 mg/mL and 4.8 × 10-1 mg/mL, respectively. The addition of Roex to the culture medium of both the above cell lines, resulted also in the reduction of cell death after H2O2 pre-treatment. The Ames test demonstrated that Roex was not genotoxic towards both TA98 and TA100 strains, with and without S9 metabolic activation. The extract, by inactivating thrombin, showed to also have an anti-coagulating effect at low concentration values. All these biological activities exerted by Roex are tightly correlated to its phytochemical profile, rich in bioactive compounds.
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Affiliation(s)
- Stefania Lamponi
- Department of Biotechnologies, Chemistry and Pharmacy, University of Siena, Via Aldo Moro 2, 53100 Siena, Italy;
- Correspondence: ; Tel.: +39-0577-234386; Fax: +39-0577-234254
| | - Maria Camilla Baratto
- Department of Biotechnologies, Chemistry and Pharmacy, University of Siena, Via Aldo Moro 2, 53100 Siena, Italy;
| | - Elisabetta Miraldi
- Department of Physical Sciences, Earth and Environment, University of Siena, Strada Laterina 8, 53100 Siena, Italy; (E.M.); (G.B.); (M.B.)
| | - Giulia Baini
- Department of Physical Sciences, Earth and Environment, University of Siena, Strada Laterina 8, 53100 Siena, Italy; (E.M.); (G.B.); (M.B.)
| | - Marco Biagi
- Department of Physical Sciences, Earth and Environment, University of Siena, Strada Laterina 8, 53100 Siena, Italy; (E.M.); (G.B.); (M.B.)
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11
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Karayilan M, Clamen L, Becker ML. Polymeric Materials for Eye Surface and Intraocular Applications. Biomacromolecules 2021; 22:223-261. [PMID: 33405900 DOI: 10.1021/acs.biomac.0c01525] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Ocular applications of polymeric materials have been widely investigated for medical diagnostics, treatment, and vision improvement. The human eye is a vital organ that connects us to the outside world so when the eye is injured, infected, or impaired, it needs immediate medical treatment to maintain clear vision and quality of life. Moreover, several essential parts of the eye lose their functions upon aging, causing diminished vision. Modern polymer science and polymeric materials offer various alternatives, such as corneal and scleral implants, artificial ocular lenses, and vitreous substitutes, to replace the damaged parts of the eye. In addition to the use of polymers for medical treatment, polymeric contact lenses can provide not only vision correction, but they can also be used as wearable electronics. In this Review, we highlight the evolution of polymeric materials for specific ocular applications such as intraocular lenses and current state-of-the-art polymeric systems with unique properties for contact lens, corneal, scleral, and vitreous body applications. We organize this Review paper by following the path of light as it travels through the eye. Starting from the outside of the eye (contact lenses), we move onto the eye's surface (cornea and sclera) and conclude with intraocular applications (intraocular lens and vitreous body) of mostly synthetic polymers and several biopolymers. Initially, we briefly describe the anatomy and physiology of the eye as a reminder of the eye parts and their functions. The rest of the Review provides an overview of recent advancements in next-generation contact lenses and contact lens sensors, corneal and scleral implants, solid and injectable intraocular lenses, and artificial vitreous body. Current limitations for future improvements are also briefly discussed.
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Affiliation(s)
- Metin Karayilan
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Liane Clamen
- Adaptilens, LLC, Boston, Massachusetts 02467, United States
| | - Matthew L Becker
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States.,Mechanical Engineering and Materials Science, Orthopaedic Surgery, and Biomedical Engineering, Duke University, Durham, North Carolina 27708, United States
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12
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Yadav I, Purohit SD, Singh H, Bhushan S, Yadav MK, Velpandian T, Chawla R, Hazra S, Mishra NC. Vitreous substitutes: An overview of the properties, importance, and development. J Biomed Mater Res B Appl Biomater 2020; 109:1156-1176. [PMID: 33319466 DOI: 10.1002/jbm.b.34778] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 10/27/2020] [Accepted: 11/28/2020] [Indexed: 11/12/2022]
Abstract
Vitreous or vitreous humor is a complex transparent gel that fills the space between the lens and retina of an eye and acts as a transparent medium that allows light to pass through it to reach the photoreceptor layer (retina) of the eye. The vitreous humor is removed in ocular surgery (vitrectomy) for pathologies like retinal detachment, macular hole, diabetes-related vitreous hemorrhage detachment, and ocular trauma. Since the vitreous is not actively regenerated or replenished, there is a need for a vitreous substitute to fill the vitreous cavity to provide a temporary or permanent tamponade to the retina following some vitreoretinal surgeries. An ideal vitreous substitute could probably be left inside the eye forever. The vitreous humor is transparent, biocompatible, viscoelastic and highly hydrophilic; polymeric hydrogels with these properties can be a potential candidate to be used as vitreous substitutes. To meet the tremendous demand for the vitreous substitute, many scientists all over the world have developed various kinds of vitreous substitutes or tamponade agent. Vitreous substitutes, whatsoever developed till date, are associated with several advantages and disadvantages, and there is no ideal vitreous substitute available till date. This review highlights the polymer-based vitreous substitutes developed so far, along with their advantages and limitations. The gas-based and oil-based substitutes have also been discussed but very briefly.
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Affiliation(s)
- Indu Yadav
- Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Roorkee, India
| | - Shiv Dutt Purohit
- Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Roorkee, India
| | - Hemant Singh
- Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Roorkee, India
| | - Sakchi Bhushan
- Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Roorkee, India
| | - Manoj Kumar Yadav
- School of Computing and Electrical Engineering, Indian Institute of Technology Mandi, Mandi, India
| | - Thirumurthy Velpandian
- Dr Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India
| | - Rohan Chawla
- Dr Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India
| | - Saugata Hazra
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, India
| | - Narayan Chandra Mishra
- Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Roorkee, India
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13
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Polymeric hydrogels as a vitreous replacement strategy in the eye. Biomaterials 2020; 268:120547. [PMID: 33307366 DOI: 10.1016/j.biomaterials.2020.120547] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Revised: 11/16/2020] [Accepted: 11/18/2020] [Indexed: 12/15/2022]
Abstract
Vitreous endo-tamponades are commonly used in the treatment of retinal detachments and tears. They function by providing a tamponading force to support the retina after retina surgery. Current clinical vitreous endo-tamponades include expansile gases (such as sulfur hexafluoride (SF6) and perfluoropropane (C3F8)) and also sislicone oil (SiO). They are effective in promoting recovery but are disadvantaged by their lower refractive indices and lower densities as compared to the native vitreous, resulting in immediate blurred vision after surgery and necessitating patients to assume prolonged face-down positioning respectively. While the gas implants diffuse out over time, the SiO implants are non-biodegradable and require surgical removal. Therefore, there is much demand to develop an ideal vitreous endo-tamponade that can combine therapeutic effectiveness with patient comfort. Polymeric hydrogels have since attracted much attention due to their favourable properties such as high water content, high clarity, suitable refractive indices, suitable density, tuneable rheological properties, injectability, and biocompatibility. Many design strategies have been employed to design polymeric hydrogel-based vitreous endo-tamponades and they can be classified into four main strategies. This review seeks to analyse these various strategies and evaluate their effectiveness and also propose the key criteria to design successful polymeric hydrogel vitreous endo-tamponades.
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14
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Tram NK, Maxwell CJ, Swindle-Reilly KE. Macro- and Microscale Properties of the Vitreous Humor to Inform Substitute Design and Intravitreal Biotransport. Curr Eye Res 2020; 46:429-444. [PMID: 33040616 DOI: 10.1080/02713683.2020.1826977] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Research on the vitreous humor and development of hydrogel vitreous substitutes have gained a rapid increase in interest within the past two decades. However, the properties of the vitreous humor and vitreous substitutes have yet to be consolidated. In this paper, the mechanical properties of the vitreous humor and hydrogel vitreous substitutes were systematically reviewed. The number of publications on the vitreous humor and vitreous substitutes over the years, as well as their respective testing conditions and testing techniques were analyzed. The mechanical properties of the human vitreous were found to be most similar to the vitreous of pigs and rabbits. The storage and loss moduli of the hydrogel vitreous substitutes developed were found to be orders of magnitude higher in comparison to the native human vitreous. However, the reported modulus for human vitreous, which was most commonly tested in vitro, has been hypothesized to be different in vivo. Future studies should focus on testing the mechanical properties of the vitreous in situ or in vivo. In addition to its mechanical properties, the vitreous humor has other biotransport mechanisms and biochemical functions that establish a redox balance and maintain an oxygen gradient inside the vitreous chamber to protect intraocular tissues from oxidative damage. Biomimetic hydrogel vitreous substitutes have the potential to provide ophthalmologists with additional avenues for treating and controlling vitreoretinal diseases while preventing complications after vitrectomy. Due to the proximity and interconnectedness of the vitreous humor to other ocular tissues, particularly the lens and the retina, more interest has been placed on understanding the properties of the vitreous humor in recent years. A better understanding of the properties of the vitreous humor will aid in improving the design of biomimetic vitreous substitutes and enhancing intravitreal biotransport.
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Affiliation(s)
- Nguyen K Tram
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA
| | - Courtney J Maxwell
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA
| | - Katelyn E Swindle-Reilly
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA.,William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH, USA.,Department of Ophthalmology & Visual Science, The Ohio State University, Columbus, OH, USA
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15
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Tram NK, McLean RM, Swindle-Reilly KE. Glutathione Improves the Antioxidant Activity of Vitamin C in Human Lens and Retinal Epithelial Cells: Implications for Vitreous Substitutes. Curr Eye Res 2020; 46:470-481. [PMID: 32838548 DOI: 10.1080/02713683.2020.1809002] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
PURPOSE Tissues in the eye are particularly susceptible to oxidative damage due to light exposure. While vitamin C (ascorbic acid) has been noted as a vital antioxidant in the vitreous humor, its physiological concentration (1-2 mM) has been shown to be toxic to retinal and lens epithelial cells in in vitro cell culture. We have explored adding vitamin C to hydrogel vitreous substitutes as a potential therapeutic to prevent oxidative damage to intraocular tissues after vitrectomy. However, vitamin C degrades rapidly even when loaded at high concentrations, limiting its long-term effectiveness. Glutathione, another antioxidant found abundantly in the lens at concentrations of 2-10 mM, was proposed to be used in conjunction with vitamin C. METHODS Cell viability and reactive oxygen species activity of human retinal and lens epithelial cells treated with various combinations of vitamin C, glutathione, hydrogen peroxide, and a hydrogel vitreous substitute were determined using CellTiter-Glo luminescent cell viability assay and dichlorofluorescein assay, respectively. The vitamin C remaining in hydrogel vitreous substitute or glutathione-vitamin C solutions was determined using a microplate reader at 265 nm wavelength, compared against standard solutions with known concentrations. RESULTS Glutathione protected the lens and retinal cells from the negative effect of vitamin C on cell viability and prolonged the antioxidant effect of vitamin C in vitro. While the detected reading of pure vitamin C solution decreased rapidly from 100% to 10% by 3 days, glutathione provided a significant extension to vitamin C stability, with 70% remaining after 14 days when the glutathione was used at physiological concentrations found in the lens (2-10 mM). CONCLUSIONS These results indicate glutathione might be an effective addition to vitamin C in intraocular implants, including potential vitreous substitutes, and warrants additional studies on the effectiveness of the vitamin C - glutathione combination in preventing oxidative stress post-vitrectomy.
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Affiliation(s)
- Nguyen K Tram
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Rayna M McLean
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Katelyn E Swindle-Reilly
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA.,William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio, USA.,Department of Ophthalmology & Visual Science, The Ohio State University, Columbus, Ohio, USA
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16
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Lamponi S, Leone G, Consumi M, Nelli N, Magnani A. Porous multi-layered composite hydrogel as cell substrate for in vitro culture of chondrocytes. INT J POLYM MATER PO 2020. [DOI: 10.1080/00914037.2020.1765351] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Stefania Lamponi
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
| | - Gemma Leone
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
| | - Marco Consumi
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
| | - Nicola Nelli
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
| | - Agnese Magnani
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
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17
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Zhou J, Lin Y, Lv J, Zhou L, Hu H, Yu L, Zhang Q, Yang H, Luo Z. Grafting with chondroitin sulfate on poly(vinyl alcohol) to improve antifouling property. BIOINSPIRED BIOMIMETIC AND NANOBIOMATERIALS 2020. [DOI: 10.1680/jbibn.19.00005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Poly(vinyl alcohol) (PVA) hydrogels become muddy while used in artificial corneas. To enhance the antifouling property of PVA hydrogels, a PVA hydrogel was grafted with chondroitin sulfate (CdS) through a two-step reaction in this work. The surface chemical compositions, surface morphology and thermal property of the hydrogel were characterized by attenuated total reflectance FTIR, X-ray photoelectron spectroscopy, atomic force microscopy, scanning electron microscopy and thermogravimetric analysis. It was confirmed that CdS was successfully grafted onto the surface of the PVA hydrogel through a two-step method. After grafting with p(GMA-CdS) (GMA: glycidyl methacrylate), both the thermal and mechanical properties of the PVA hydrogel became weaker and the PVA hydrogel became hydrophilic. The biocompatibility of the PVA-g-p(GMA-CdS) hydrogel could be considered as non-cytotoxic according to ISO 10993-5:2009. The antifouling property of the PVA-g-p(GMA-CdS) hydrogel, namely its anti-protein adsorption and anti-cell adhesion, was significantly improved due to surface hydration, steric exclusion effect and charge surface. The anti-protein adsorption of the PVA-g-p(GMA-CdS) hydrogel increased by about 33·48% in comparison with that of the PVA hydrogel and the anti-cell adhesion increased by about 67·92%. Overall, the PVA-g-p(GMA-CdS) hydrogel is an ideal biomaterial candidate for artificial corneas.
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Affiliation(s)
- Jinsheng Zhou
- Department of Materials Science and Engineering, Zhejiang University, Hangzhou, China
| | - Yanming Lin
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, China
| | - Jing Lv
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, China
| | - Li Zhou
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, China
| | - Huiyuan Hu
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, China
| | - Li Yu
- Shenzhen Eye Hospital, Shenzhen, China; Shenzhen Key Laboratory of Ophthalmology, Shenzhen, China
| | - Qilong Zhang
- Department of Materials Science and Engineering, Zhejiang University, Hangzhou, China
| | - Hui Yang
- Department of Materials Science and Engineering, Zhejiang University, Hangzhou, China
| | - Zhongkuan Luo
- Department of Materials Science and Engineering, Zhejiang University, Hangzhou, China; College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, China
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18
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Tram NK, Jiang P, Torres‐Flores TC, Jacobs KM, Chandler HL, Swindle‐Reilly KE. A Hydrogel Vitreous Substitute that Releases Antioxidant. Macromol Biosci 2019; 20:e1900305. [DOI: 10.1002/mabi.201900305] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 11/11/2019] [Indexed: 02/05/2023]
Affiliation(s)
- Nguyen K. Tram
- Department of Biomedical Engineering The Ohio State University 1080 Carmack Rd. Columbus OH 43210 USA
| | - Pengfei Jiang
- William G. Lowrie Department of Chemical and Biomolecular Engineering The Ohio State University 151 W. Woodruff Avenue Columbus OH 43210 USA
| | - Tiara C. Torres‐Flores
- Department of Biomedical Engineering The Ohio State University 1080 Carmack Rd. Columbus OH 43210 USA
| | - Kane M. Jacobs
- William G. Lowrie Department of Chemical and Biomolecular Engineering The Ohio State University 151 W. Woodruff Avenue Columbus OH 43210 USA
| | - Heather L. Chandler
- College of Optometry The Ohio State University 338 West 10th Avenue Columbus OH 43210 USA
| | - Katelyn E. Swindle‐Reilly
- Department of Biomedical Engineering The Ohio State University 1080 Carmack Rd. Columbus OH 43210 USA
- William G. Lowrie Department of Chemical and Biomolecular Engineering The Ohio State University 151 W. Woodruff Avenue Columbus OH 43210 USA
- Department of Ophthalmology and Visual Science The Ohio State University 915 Olentangy River Road, Suite 5000 Columbus OH 43212 USA
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19
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Covalent hyaluronic-based coating of magnetite nanoparticles: Preparation, physicochemical and biological characterization. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 107:110271. [PMID: 31761218 DOI: 10.1016/j.msec.2019.110271] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Revised: 09/13/2019] [Accepted: 10/01/2019] [Indexed: 12/19/2022]
Abstract
In this paper we report about the preparation, physicochemical and biological characterization of a magneto responsive nanostructured material based on magnetite nanoparticles (NP) coated with hyaluronic acid (HA). A synthetic approach, based on a Cu(I)-catalyzed azide-alkyne 1,3-dipolar cycloaddition "click" reaction between azido-functionalized magnetite NP and a derivative of hyaluronic acid bearing propargylated ferulic acid groups (HA-FA-Pg), was developed to link covalently the polymer layer to the magnetite NP. The functionalization steps of the magnetite NP and their coating with the HA-FA-Pg layer were monitored by Fourier Transform Infrared (FTIR) spectroscopy and Thermal Gravimetric Analysis (TGA) while Dynamic Light Scattering (DLS) and ζ-potential measurements were performed to characterize the aqueous dispersions of the HA-coated magnetite NP. Aggregation and sedimentation processes were investigated also by UV-visible spectroscopy and the dispersions of HA-coated magnetite NP were found significantly more stable than those of bare NP. Magnetization and zero field cooled/field cooled curves revealed that both bare and HA-coated magnetite NP are superparamagnetic at room temperature. Moreover, cytotoxicity studies showed that the coating with HA-FA-Pg significantly reduces the cytotoxicity of the magnetite NP providing the rational basis for the application of the HA-coated magnetite NP as healthcare material.
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20
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Zhou J, Lin Y, Ye L, Wang L, Zhou L, Hu H, Zhang Q, Yang H, Luo Z. PVA Hydrogel Functionalization via PET-RAFT Grafting with Glycidyl Methacrylate and Immobilization with 2-Hydroxypropyltrimethyl Ammonium Chloride Chitosan via Ring-Open Reaction. Macromol Res 2019. [DOI: 10.1007/s13233-019-7152-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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21
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Lamponi S, Aloisi AM, Bonechi C, Consumi M, Donati A, Leone G, Rossi C, Tamasi G, Ghiandai L, Ferrini E, Fiorenzani P, Ceccarelli I, Magnani A. Evaluation of in vitro cell and blood compatibility and in vivo analgesic activity of plant-derived dietary supplements. JOURNAL OF INTEGRATIVE MEDICINE-JIM 2019; 17:213-220. [DOI: 10.1016/j.joim.2019.02.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Accepted: 12/29/2018] [Indexed: 12/21/2022]
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22
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Jurney PL, Anderson DEJ, Pohan G, Yim EKF, Hinds MT. Reactive Ion Plasma Modification of Poly(Vinyl-Alcohol) Increases Primary Endothelial Cell Affinity and Reduces Thrombogenicity. Macromol Biosci 2018; 18:e1800132. [PMID: 30256533 PMCID: PMC6644031 DOI: 10.1002/mabi.201800132] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Revised: 07/27/2018] [Accepted: 08/01/2018] [Indexed: 11/12/2022]
Abstract
Bulk material properties and luminal surface interaction with blood determine the clinical viability of vascular grafts, and reducing intimal hyperplasia is necessary to improve their long-term patency. Here, the authors report that the surface of a biocompatible hydrogel material, poly(vinyl alcohol) (PVA) can be altered by exposing it to reactive ion plasma (RIP) in order to increase primary endothelial cell attachment. The power and the carrier gas of the RIP treatment are varied and the resultant surface nitrogen, water contact angle, as well as the ability of the RIP-treated surfaces to support primary endothelial colony forming cells is characterized. Additionally, in a clinically relevant shunt model, the amounts of platelet and fibrin attachment to the surface were quantified during exposure to non-anticoagulated blood. Treatments with all carrier gases resulted in an increase in the surface nitrogen. Treating PVA with O2 , N2 , and Ar RIP increased affinity to primary endothelial colony forming cells. The RIP treatments did not increase the thrombogenicity compared to untreated PVA and had significantly less platelet and fibrin attachment compared to the current clinical standard of expanded polytetrafluoroethylene (ePTFE). These findings indicate that RIP-treatment of PVA could lead to increased patency in synthetic vascular grafts.
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Affiliation(s)
- Patrick L Jurney
- Dr. P. L. Jurney, Dr. D. E. J. Anderson, Prof. M. T. Hinds, Department of Biomedical Engineering, Oregon Health & Science University, Portland, OR, 97239, USA
| | - Deirdre E J Anderson
- Dr. P. L. Jurney, Dr. D. E. J. Anderson, Prof. M. T. Hinds, Department of Biomedical Engineering, Oregon Health & Science University, Portland, OR, 97239, USA
| | - Grace Pohan
- G. Pohan, Prof. E. K. F. Yim, Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario, Canada, N2L 3G1
| | - Evelyn K F Yim
- G. Pohan, Prof. E. K. F. Yim, Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario, Canada, N2L 3G1
| | - Monica T Hinds
- Dr. P. L. Jurney, Dr. D. E. J. Anderson, Prof. M. T. Hinds, Department of Biomedical Engineering, Oregon Health & Science University, Portland, OR, 97239, USA
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23
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Bernardini G, Leone G, Millucci L, Consumi M, Braconi D, Spiga O, Galderisi S, Marzocchi B, Viti C, Giorgetti G, Lupetti P, Magnani A, Santucci A. Homogentisic acid induces morphological and mechanical aberration of ochronotic cartilage in alkaptonuria. J Cell Physiol 2018; 234:6696-6708. [DOI: 10.1002/jcp.27416] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Accepted: 08/21/2018] [Indexed: 12/18/2022]
Affiliation(s)
- Giulia Bernardini
- Dipartimento di Biotecnologie, Chimica e Farmacia Università degli Studi di Siena Siena Italy
| | - Gemma Leone
- Dipartimento di Biotecnologie, Chimica e Farmacia Università degli Studi di Siena Siena Italy
| | - Lia Millucci
- Dipartimento di Biotecnologie, Chimica e Farmacia Università degli Studi di Siena Siena Italy
| | - Marco Consumi
- Dipartimento di Biotecnologie, Chimica e Farmacia Università degli Studi di Siena Siena Italy
| | - Daniela Braconi
- Dipartimento di Biotecnologie, Chimica e Farmacia Università degli Studi di Siena Siena Italy
| | - Ottavia Spiga
- Dipartimento di Biotecnologie, Chimica e Farmacia Università degli Studi di Siena Siena Italy
| | - Silvia Galderisi
- Dipartimento di Biotecnologie, Chimica e Farmacia Università degli Studi di Siena Siena Italy
| | - Barbara Marzocchi
- Dipartimento di Biotecnologie, Chimica e Farmacia Università degli Studi di Siena Siena Italy
- UOC Patologia Clinica, Azienda Ospedaliera Universitaria Senese Siena Italy
| | - Cecilia Viti
- Dipartimento di Scienze Fisiche, della Terra e dell'Ambiente Università degli Studi di Siena Siena Italy
| | - Giovanna Giorgetti
- Dipartimento di Scienze Fisiche, della Terra e dell'Ambiente Università degli Studi di Siena Siena Italy
| | - Pietro Lupetti
- Dipartimento di Scienze della Vita Università degli Studi di Siena Siena Italy
| | - Agnese Magnani
- Dipartimento di Biotecnologie, Chimica e Farmacia Università degli Studi di Siena Siena Italy
| | - Annalisa Santucci
- Dipartimento di Biotecnologie, Chimica e Farmacia Università degli Studi di Siena Siena Italy
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Leone G, Consumi M, Lamponi S, Bonechi C, Tamasi G, Donati A, Rossi C, Magnani A. Hybrid PVA-xanthan gum hydrogels as nucleus pulposus substitutes. INT J POLYM MATER PO 2018. [DOI: 10.1080/00914037.2018.1482468] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Gemma Leone
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
- INSTM, Florence, Italy
| | - Marco Consumi
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
- INSTM, Florence, Italy
| | - Stefania Lamponi
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
- INSTM, Florence, Italy
| | - Claudia Bonechi
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
- CSGI, Sesto Fiorentino, Italy
| | - Gabriella Tamasi
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
- CSGI, Sesto Fiorentino, Italy
| | - Alessandro Donati
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
- CSGI, Sesto Fiorentino, Italy
| | - Claudio Rossi
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
- CSGI, Sesto Fiorentino, Italy
- Operative Unit, University of Siena, Calabria, Italy
| | - Agnese Magnani
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
- INSTM, Florence, Italy
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25
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Alginate-gelatin formulation to modify lovastatin release profile from red yeast rice for hypercholesterolemia therapy. Ther Deliv 2018; 8:843-854. [PMID: 28944737 DOI: 10.4155/tde-2017-0025] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
AIM The preparation of a delivery system able to guarantee a delayed release of lovastatin from red yeast rice (RYR) is mandatory to counteract cholesterol biosynthesis effectively. MATERIALS & METHODS Polymeric formulations were prepared mixing alginate and gelatin, in different ratios, with RYR. The effect of different composition on stiffness, viscosity, swelling behavior and mesostructure of matrices was analyzed. RESULTS Formulations obtained combining polymers in comparable amount (i.e., 60/40 and 50/50) guaranteed a delayed release of lovastatin from RYR, a prolonged inhibitory activity toward 3-hydroxy-3-methylglutaryl-coenzyme A reductase and a decreased cholesterol synthesis. CONCLUSION The formulation obtained combining 60% gelatin and 40% of alginate showed physicochemical properties suitable to lead a lovastatin release profile compatible with cholesterol biosynthesis.
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26
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Consumi M, Leone G, Pepi S, Tamasi G, Lamponi S, Donati A, Bonechi C, Rossi C, Magnani A. Xanthan Gum-Chitosan: Delayed, prolonged, and burst-release tablets using same components in different ratio. ADVANCES IN POLYMER TECHNOLOGY 2018. [DOI: 10.1002/adv.21965] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Marco Consumi
- Department of Biotechnology, Chemistry and Pharmacy; University of Siena; Siena Italy
- National Interuniversity Consortium of Materials Science and Technology-INSTM; Firenze Italy
| | - Gemma Leone
- Department of Biotechnology, Chemistry and Pharmacy; University of Siena; Siena Italy
- National Interuniversity Consortium of Materials Science and Technology-INSTM; Firenze Italy
| | - Simone Pepi
- Department of Biotechnology, Chemistry and Pharmacy; University of Siena; Siena Italy
| | - Gabriella Tamasi
- Department of Biotechnology, Chemistry and Pharmacy; University of Siena; Siena Italy
- Center for Colloid and Surface Science-CSGI; Sesto Fiorentino Italy
| | - Stefania Lamponi
- Department of Biotechnology, Chemistry and Pharmacy; University of Siena; Siena Italy
- National Interuniversity Consortium of Materials Science and Technology-INSTM; Firenze Italy
| | - Alessandro Donati
- Department of Biotechnology, Chemistry and Pharmacy; University of Siena; Siena Italy
- Center for Colloid and Surface Science-CSGI; Sesto Fiorentino Italy
| | - Claudia Bonechi
- Department of Biotechnology, Chemistry and Pharmacy; University of Siena; Siena Italy
- Center for Colloid and Surface Science-CSGI; Sesto Fiorentino Italy
| | - Claudio Rossi
- Department of Biotechnology, Chemistry and Pharmacy; University of Siena; Siena Italy
- Center for Colloid and Surface Science-CSGI; Sesto Fiorentino Italy
- Operative Unit; University of Siena; Calabria Italy
| | - Agnese Magnani
- Department of Biotechnology, Chemistry and Pharmacy; University of Siena; Siena Italy
- National Interuniversity Consortium of Materials Science and Technology-INSTM; Firenze Italy
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27
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Development of liposomal formulations to potentiate natural lovastatin inhibitory activity towards 3-hydroxy-3-methyl-glutaryl coenzyme A (HMG-CoA) reductase. J Drug Deliv Sci Technol 2018. [DOI: 10.1016/j.jddst.2017.09.019] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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28
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Cutiongco MFA, Kukumberg M, Peneyra JL, Yeo MS, Yao JY, Rufaihah AJ, Le Visage C, Ho JP, Yim EKF. Submillimeter Diameter Poly(Vinyl Alcohol) Vascular Graft Patency in Rabbit Model. Front Bioeng Biotechnol 2016; 4:44. [PMID: 27376059 PMCID: PMC4896917 DOI: 10.3389/fbioe.2016.00044] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 05/17/2016] [Indexed: 11/13/2022] Open
Abstract
Microvascular surgery is becoming a prevalent surgical practice. Replantation, hand reconstruction, orthopedic, and free tissue transfer procedures all rely on microvascular surgery for the repair of venous and arterial defects at the millimeter and submillimeter levels. Often, a vascular graft is required for the procedure as a means to bridge the gap between native arteries. While autologous vessels are desired for their bioactivity and non-thrombogenicity, the tedious harvest process, lack of availability, and caliber or mechanical mismatch contribute to graft failure. Thus, there is a need for an off-the-shelf artificial vascular graft that has low thrombogenic properties and mechanical properties matching those of submillimeter vessels. Poly(vinyl alcohol) hydrogel (PVA) has excellent prospects as a vascular graft due to its bioinertness, low thrombogenicity, high water content, and tunable mechanical properties. Here, we fabricated PVA grafts with submillimeter diameter and mechanical properties that closely approximated those of the rabbit femoral artery. In vitro platelet adhesion and microparticle release assay verified the low thrombogenicity of PVA. A stringent proof-of-concept in vivo test was performed by implanting PVA grafts in rabbit femoral artery with multilevel arterial occlusion. Laser Doppler measurements indicated the improved perfusion of the distal limb after implantation with PVA grafts. Moreover, ultrasound Doppler and angiography verified that the submillimeter diameter PVA vascular grafts remained patent for 2 weeks without the aid of anticoagulant or antithrombotics. Endothelial cells were observed in the luminal surface of one patent PVA graft. The advantageous non-thrombogenic and tunable mechanical properties of PVA that are retained even in the submillimeter diameter dimensions support the application of this biomaterial for vascular replacement in microvascular surgery.
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Affiliation(s)
- Marie F A Cutiongco
- Mechanobiology Institute, National University of Singapore, Singapore; Department of Biomedical Engineering, National University of Singapore, Singapore
| | - Marek Kukumberg
- Mechanobiology Institute, National University of Singapore , Singapore
| | | | - Matthew S Yeo
- Division of Plastic, Reconstructive and Aesthetic Surgery, Department of Surgery, National University Health System, Singapore; Plastic, Reconstructive and Aesthetic Surgery Section, Department of General Surgery, Tan Tock Seng Hospital, Singapore
| | - Jia Y Yao
- Department of Biomedical Engineering, National University of Singapore , Singapore
| | - Abdul Jalil Rufaihah
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore , Singapore
| | - Catherine Le Visage
- INSERM, U791, Center for OsteoArticular and Dental Tissue Engineering, Université de Nantes , Nantes , France
| | - Jackie Pei Ho
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Department of Cardiovascular and Thoracic Surgery, National University Health System, Singapore
| | - Evelyn K F Yim
- Mechanobiology Institute, National University of Singapore, Singapore; Department of Biomedical Engineering, National University of Singapore, Singapore; Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Department of Chemical Engineering, University of Waterloo, Waterloo, ON, Canada
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Morandim-Giannetti ADA, Silva RC, Magalhães O, Schor P, Bersanetti PA. Conditions for obtaining polyvinyl alcohol/trisodium trimetaphosphate hydrogels as vitreous humor substitute. J Biomed Mater Res B Appl Biomater 2015. [DOI: 10.1002/jbm.b.33473] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Rosianne Cristina Silva
- Departamento de Engenharia Química; Centro Universitário da FEI, São Bernardo do Campo; São Paulo Brazil
| | - Octaviano Magalhães
- Departamento de Oftalmologia e Ciências Visuais; Escola Paulista de Medicina, Universidade Federal de São Paulo, UNIFESP; São Paulo Brazil
| | - Paulo Schor
- Departamento de Oftalmologia e Ciências Visuais; Escola Paulista de Medicina, Universidade Federal de São Paulo, UNIFESP; São Paulo Brazil
| | - Patrícia Alessandra Bersanetti
- Departamento de Oftalmologia e Ciências Visuais; Escola Paulista de Medicina, Universidade Federal de São Paulo, UNIFESP; São Paulo Brazil
- Departamento de Informática em Saúde; Escola Paulista de Medicina, Universidade Federal de São Paulo, UNIFESP; São Paulo Brazil
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30
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Freeze-Thawed Hybridized Preparation with Biomimetic Self-Assembly for a Polyvinyl Alcohol/Collagen Hydrogel Created for Meniscus Tissue Engineering. JOURNAL OF BIOMIMETICS BIOMATERIALS AND BIOMEDICAL ENGINEERING 2014. [DOI: 10.4028/www.scientific.net/jbbbe.21.17] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Freeze-thawed hybridized preparation and the biomimetic self-assembly technique were used to fabricate hydrogel as tissue engineered scaffolds for meniscus tissue. Because of the advantages of both techniques, they were hybridized together as an interesting preparation for hydrogel. Three molecular weights (high, medium, and low) of PVA were prepared in a biomimetic solution before formation into hydrogel by freeze-thawing. The most suitable molecular weight PVA for hydrogel formation was chosen to be mixed with collagen. PVA, PVA/collagen, and collagen were prepared in biomimetic solutions and freeze-thawed into hydrogels. The hydrogels were analyzed and characterized by FTIR, DSC, and SEM. FTIR characterization indicated that high molecular weight PVA formed molecular interaction better than the other molecular weights, and PVA molecules formed molecular interaction with collagen molecules via –OH and C=O groups. DSC characterization showed that the hybridized preparation of freeze-thawing and biomimetic self-assembly kept the characteristics of PVA and collagen. SEM analysis demonstrated that the morphological formation of PVA/collagen was hybridized during freeze-thawing and collagen self-assembly. The morphological structure was organized into a porous network structure. The porous structure showed a rough wall that was formed by the hybridized structure of the crystal domain dispersed in amorphous and collagen self-assembly.
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31
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Ino JM, Sju E, Ollivier V, Yim EKF, Letourneur D, Le Visage C. Evaluation of hemocompatibility and endothelialization of hybrid poly(vinyl alcohol) (PVA)/gelatin polymer films. J Biomed Mater Res B Appl Biomater 2013; 101:1549-59. [PMID: 23846987 DOI: 10.1002/jbm.b.32977] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Revised: 04/29/2013] [Accepted: 05/01/2013] [Indexed: 11/08/2022]
Abstract
Engineered grafts are still needed for small diameter blood vessels reconstruction. Ideal materials would prevent thrombosis and intimal hyperplasia by displaying hemocompatibility and mechanical properties close to those of native vessels. In this study, poly(vinyl alcohol) (PVA)/gelatin blends were investigated as a potential vascular support scaffold. We modified a chemically crosslinked PVA hydrogel by incorporation of gelatin to improve endothelial cell attachment with a single-step method. A series of crosslinked PVA/gelatin films with specific ratios set at 100:0, 99:1, 95:5, and 90:10 (w/w) were prepared and their mechanical properties were examined by uniaxial tensile testing. Tubes, obtained from sutured films, were found highly compliant (3.1-4.6%) and exhibited sufficient mechanical strength to sustain hemodynamic strains. PVA-based hydrogels maintained low level of platelet adhesion and low thrombogenic potential. Endothelial cell adhesion and proliferation were drastically improved on PVA/gelatin films with a feed gelatin content as low as 1% (w/w), leading to the formation of a confluent endothelium. Hydrogels with higher gelatin content did not sustain complete endothelialization because of modifications of the film surface, including phase segregation and formation of microdomains. Thus, PVA/gelatin (99:1, w/w) hydrogels appear as promising materials for the design of endothelialized vascular materials with long-term patency.
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Affiliation(s)
- Julia M Ino
- Inserm, U698, Cardiovascular Bio-Engineering, X. Bichat Hospital, 75018, Paris, France; Institut Galilée, University Paris 13, 93430, Villetaneuse, France
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Leone G, Bidini A, Lamponi S, Magnani A. States of water, surface and rheological characterisation of a new biohydrogel as articular cartilage substitute. POLYM ADVAN TECHNOL 2013. [DOI: 10.1002/pat.3150] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Gemma Leone
- Department of Biotechnology, Chemistry and Pharmacy; University of Siena; Via Aldo Moro 2 53100 Siena Italy and INSTM
| | | | - Stefania Lamponi
- Department of Biotechnology, Chemistry and Pharmacy; University of Siena; Via Aldo Moro 2 53100 Siena Italy and INSTM
| | - Agnese Magnani
- Department of Biotechnology, Chemistry and Pharmacy; University of Siena; Via Aldo Moro 2 53100 Siena Italy and INSTM
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Aiello F, Garofalo A, Aloisi AM, Lamponi S, Magnani A, Petroni A. Synthesis of esters of androgens with unsaturated fatty acids for androgen requiring therapy. J Endocrinol Invest 2013; 36:390-5. [PMID: 23095310 DOI: 10.3275/8655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Androgens' metabolism and activity are gaining a more and more important role in human physiology particularly referring to aging and to neurodegenerative diseases. Androgen treatment is often required for long-lasting disorders. In order to improve their duration and effects, androgens can be administered as esters of carboxylic acids. The novelty of our research is the use of esters of androgens with specific unsaturated fatty acids, in order to reduce possible side effects particularly related to chronic pathologies with altered lipid homeostasis such as X-linked adrenoleukodystrophy and cardiovascular disorders. Thus the esters of the main androgenic substances testosterone, dihydrotestosterone (DHT) and their metabolite 5α-androstan-3α,17β-diol were chemically obtained by coupling with different unsaturated fatty acids. To this aim, fatty acids with various degree of unsaturation and belonging to different series were selected. Specifically, oleic acid (18:1, n-9), linoleic acid (18:2, n-6), and the n-3 fatty acids, α-linolenic acid (18:3), eicosapentaenoic acid (EPA, 20:5), and docosahexaenoic acid (DHA, 22:6) were used obtaining corresponding esters with acceptable yields and good degree of purity. All the synthesized compounds were tested for their cytotoxic activities in mouse NIH3T3 and human astrocyte cell lines. The esters demonstrated good tolerability and no in vitro cytotoxic effect in both cell cultures. After these promising preliminary results, the esters will be suitable for in vivo studies in order to ascertain their pharmacokinetic characteristics and their biological effects.
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Affiliation(s)
- F Aiello
- Department of Pharmaceutical Sciences, University of Calabria, Rende (CS), Italy
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Singh R, Singh D. Radiation synthesis of PVP/alginate hydrogel containing nanosilver as wound dressing. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2012; 23:2649-2658. [PMID: 22886579 DOI: 10.1007/s10856-012-4730-3] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2012] [Accepted: 07/23/2012] [Indexed: 05/27/2023]
Abstract
Hydrogels with polyvinyl pyrrolidone (PVP) and alginate were synthesized and silver nanoparticles were incorporated in hydrogel network using gamma radiation. PVP (10 and 15 %) in combination with 0.5 and 1 % alginate was gamma irradiated at different doses of 25 and 40 kGy. Maximum gel percent was obtained with 15 % PVP in combination with 0.5 % alginate. The fluid absorption capacity for the PVP/alginate hydrogels was about 1881-2361 % at 24 h. Moisture vapour transmission rate (MVTR) of hydrogels containing nanosilver at 24 h was 278.44 g/(m(2)h). The absorption capacity and moisture permeability of the PVP/alginate-nanosilver composite hydrogel dressings show the ability of the hydrogels to prevent fluid accumulation in exudating wound. The hydrogels containing nanosilver demonstrated strong antimicrobial effect and complete inhibition of microbial growth was observed with 70 ppm nanosilver dressings. PVP/alginate hydrogels containing nanosilver with efficient fluid handling capacity and antimicrobial activity was found suitable for use as wound dressing.
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Affiliation(s)
- Rita Singh
- Radiation Dosimetry and Processing Group, Defence Laboratory, Defence Research and Development Organization, Jodhpur, India.
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Annaka M, Mortensen K, Vigild ME, Matsuura T, Tsuji S, Ueda T, Tsujinaka H. Design of an Injectable in Situ Gelation Biomaterials for Vitreous Substitute. Biomacromolecules 2011; 12:4011-21. [DOI: 10.1021/bm201012f] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Masahiko Annaka
- Department
of Chemistry, Kyushu University, Fukuoka
812-8581, Japan
- International
Research Center
for Molecular Systems, Kyushu University, Fukuoka 819-0395, Japan
| | - Kell Mortensen
- Department of Natural Sciences, University of Copenhagen, Thorvaldsensvej 40, DK1871
Frederiksberg C, Denmark
| | - Martin E. Vigild
- Danish Polymer Center and Department
of Chemical Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - Toyoaki Matsuura
- Department of Ophthalmology, Nara Medical University, Kashihara, Nara 634-8522,
Japan
| | - Souichiro Tsuji
- Department
of Chemistry, Kyushu University, Fukuoka
812-8581, Japan
| | - Tetsuo Ueda
- Department of Ophthalmology, Nara Medical University, Kashihara, Nara 634-8522,
Japan
| | - Hiroki Tsujinaka
- Department of Ophthalmology, Nara Medical University, Kashihara, Nara 634-8522,
Japan
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