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Thirunavukarasu AJ, Morales-Wong F, Halim NSH, Han E, Koh SK, Zhou L, Kocaba V, Venkatraman S, Mehta JS, Riau AK. Nanohydroxyapatite Coating Attenuates Fibrotic and Immune Responses to Promote Keratoprosthesis Biointegration in Advanced Ocular Surface Disorders. ACS APPLIED MATERIALS & INTERFACES 2024; 16:25892-25908. [PMID: 38740379 PMCID: PMC11129699 DOI: 10.1021/acsami.4c04077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2024] [Revised: 04/17/2024] [Accepted: 04/18/2024] [Indexed: 05/16/2024]
Abstract
Keratoprosthesis (KPro) implantation is frequently the only recourse for patients with severe corneal disease. However, problems arise due to inadequate biointegration of the KPro, particularly the PMMA optical cylinder, such as tissue detachment, tissue melting, or eye-threatening infection in the interface. Here, using the AuroKPro as a model prosthesis, a surface functionalization approach─coating the optical cylinder with nanohydroxyapatite (nHAp)─was trialed in rabbit eyes with and without a proceeding chemical injury. In chemically injured eyes, which simulated total limbal epithelial stem cell deficiency, clear benefits were conferred by the coating. The total modified Hackett-McDonald score and area of tissue apposition differences 12 weeks after implantation were 5.0 and 22.5%, respectively. Mechanical push-in tests revealed that 31.8% greater work was required to detach the tissues. These differences were less marked in uninjured eyes, which showed total score and tissue apposition differences of 2.5 and 11.5%, respectively, and a work difference of 23.5%. The improved biointegration could be contributed by the attenuated expression of fibronectin (p = 0.036), collagen 3A1 (p = 0.033), and α-smooth muscle actin (p = 0.045)─proteins typically upregulated during nonadherent fibrous capsule envelopment of bioinert material─adjacent to the optical cylinders. The coating also appeared to induce a less immunogenic milieu in the ocular surface tissue, evidenced by the markedly lower expression of tear proteins associated with immune and stimulus responses. Collectively, the level of these tear proteins in eyes with coated prostheses was 1.1 ± 13.0% of naïve eyes: substantially lower than with noncoated KPros (246.5 ± 79.3% of naïve, p = 0.038). Together, our results indicated that nHAp coating may reduce the risk of prosthesis failure in severely injured eyes, which are representative of the cohort of KPro patients.
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Affiliation(s)
- Arun J. Thirunavukarasu
- Tissue
Engineering and Cell Therapy Group, Singapore
Eye Research Institute, Singapore 169856, Singapore
- Oxford
University Clinical Academic Graduate School, University of Oxford, Oxford OX3 9DU, United
Kingdom
| | - Fernando Morales-Wong
- Tissue
Engineering and Cell Therapy Group, Singapore
Eye Research Institute, Singapore 169856, Singapore
- Singapore
National Eye Centre, Singapore 168751, Singapore
- Autonomous
University of Nuevo Leon, San Nicolas
de los Garza, Nuevo Leon 66455, Mexico
| | | | - Evelina Han
- Tissue
Engineering and Cell Therapy Group, Singapore
Eye Research Institute, Singapore 169856, Singapore
| | - Siew Kwan Koh
- Ocular
Proteomics Group, Singapore Eye Research
Institute, Singapore 169856, Singapore
| | - Lei Zhou
- Department
of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hung Hom, Hong Kong
- Centre
for Eye and Vision Research, Shatin, Hong Kong
| | - Viridiana Kocaba
- Tissue
Engineering and Cell Therapy Group, Singapore
Eye Research Institute, Singapore 169856, Singapore
| | - Subramanian Venkatraman
- Department
of Materials Science and Engineering, National
University of Singapore, Singapore 117575, Singapore
- iHealthTech, National University of Singapore, Singapore 117599, Singapore
| | - Jodhbir S. Mehta
- Tissue
Engineering and Cell Therapy Group, Singapore
Eye Research Institute, Singapore 169856, Singapore
- Singapore
National Eye Centre, Singapore 168751, Singapore
- Ophthalmology
and Visual Sciences Academic Clinical Programme, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Andri K. Riau
- Tissue
Engineering and Cell Therapy Group, Singapore
Eye Research Institute, Singapore 169856, Singapore
- Ophthalmology
and Visual Sciences Academic Clinical Programme, Duke-NUS Medical School, Singapore 169857, Singapore
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2
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Liu S, Bai Q, Jiang Y, Gao Y, Chen Z, Shang L, Zhang S, Yu L, Yang D, Sui N, Zhu Z. Multienzyme-Like Nanozyme Encapsulated Ocular Microneedles for Keratitis Treatment. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2308403. [PMID: 38098457 DOI: 10.1002/smll.202308403] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 11/12/2023] [Indexed: 05/25/2024]
Abstract
Keratitis, an inflammation of the cornea caused by bacterial or fungal infections, is one of the leading causes of severe visual disability and blindness. Keratitis treatment requires both the prevention of infection and the reduction of inflammation. However, owing to their limited therapeutic functions, in addition to the ocular barrier, existing conventional medications are characterized by poor efficacy and low bioavailability, requiring high dosages or frequent topical treatment, which represents a burden on patients and increases the risk of side effects. In this study, manganese oxide nanocluster-decorated graphdiyne nanosheets (MnOx/GDY) are developed as multienzyme-like nanozymes for the treatment of infectious keratitis and loaded into hyaluronic acid and polymethyl methacrylate-based ocular microneedles (MGMN). MGMN not only exhibits antimicrobial and anti-inflammatory effects owing to its multienzyme-like activities, including oxidase, peroxidase, catalase, and superoxide dismutase mimics but also crosses the ocular barrier and shows increased bioavailability via the microneedle system. Moreover, MGMN is demonstrated to eliminate pathogens, prevent biofilm formation, reduce inflammation, alleviate ocular hypoxia, and promote the repair of corneal epithelial damage in in vitro, ex vivo, and in vivo experiments, thus providing a better therapeutic effect than commercial ophthalmic voriconazole, with no obvious microbial resistance or cytotoxicity.
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Affiliation(s)
- Shen Liu
- College of Materials Science and Engineering, Qingdao University of Science and Technology, 53 Zhengzhou Road, Qingdao, Shandong, 266042, China
| | - Qiang Bai
- College of Materials Science and Engineering, Qingdao University of Science and Technology, 53 Zhengzhou Road, Qingdao, Shandong, 266042, China
| | - Yujie Jiang
- College of Materials Science and Engineering, Qingdao University of Science and Technology, 53 Zhengzhou Road, Qingdao, Shandong, 266042, China
| | - Yonghui Gao
- College of Materials Science and Engineering, Qingdao University of Science and Technology, 53 Zhengzhou Road, Qingdao, Shandong, 266042, China
| | - Zhen Chen
- College of Materials Science and Engineering, Qingdao University of Science and Technology, 53 Zhengzhou Road, Qingdao, Shandong, 266042, China
| | - Limin Shang
- College of Materials Science and Engineering, Qingdao University of Science and Technology, 53 Zhengzhou Road, Qingdao, Shandong, 266042, China
| | - Siying Zhang
- College of Materials Science and Engineering, Qingdao University of Science and Technology, 53 Zhengzhou Road, Qingdao, Shandong, 266042, China
| | - Linrong Yu
- College of Chemical Engineering, Qingdao University of Science and Technology, 53 Zhengzhou Road, Qingdao, Shandong, 266042, China
| | - Dongqin Yang
- Central Laboratory, Huashan Hospital, Fudan University, 12 Middle Urumqi Road, Shanghai, 200040, China
| | - Ning Sui
- College of Materials Science and Engineering, Qingdao University of Science and Technology, 53 Zhengzhou Road, Qingdao, Shandong, 266042, China
| | - Zhiling Zhu
- College of Materials Science and Engineering, Qingdao University of Science and Technology, 53 Zhengzhou Road, Qingdao, Shandong, 266042, China
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3
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Whalen M, Akula M, McNamee SM, DeAngelis MM, Haider NB. Seeing the Future: A Review of Ocular Therapy. Bioengineering (Basel) 2024; 11:179. [PMID: 38391665 PMCID: PMC10886198 DOI: 10.3390/bioengineering11020179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 02/03/2024] [Accepted: 02/08/2024] [Indexed: 02/24/2024] Open
Abstract
Ocular diseases present a unique challenge and opportunity for therapeutic development. The eye has distinct advantages as a therapy target given its accessibility, compartmentalization, immune privilege, and size. Various methodologies for therapeutic delivery in ocular diseases are under investigation that impact long-term efficacy, toxicity, invasiveness, and delivery range. While gene, cell, and antibody therapy and nanoparticle delivery directly treat regions that have been damaged by disease, they can be limited in the duration of the therapeutic delivery and have a focal effect. In contrast, contact lenses and ocular implants can more effectively achieve sustained and widespread delivery of therapies; however, they can increase dilution of therapeutics, which may result in reduced effectiveness. Current therapies either offer a sustained release or a broad therapeutic effect, and future directions should aim toward achieving both. This review discusses current ocular therapy delivery systems and their applications, mechanisms for delivering therapeutic products to ocular tissues, advantages and challenges associated with each delivery system, current approved therapies, and clinical trials. Future directions for the improvement in existing ocular therapies include combination therapies, such as combined cell and gene therapies, as well as AI-driven devices, such as cortical implants that directly transmit visual information to the cortex.
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Affiliation(s)
- Maiya Whalen
- Department of Biology, Boston College, Chestnut Hill, MA 02467, USA
| | | | | | - Margaret M DeAngelis
- Department of Ophthalmology, Jacobs School of Medicine & Biomedical Sciences, University at Buffalo, Buffalo, NY 14203, USA
| | - Neena B Haider
- Shifa Precision, Boston, MA 02138, USA
- Department of Cell Biology, Harvard Medical School, Boston, MA 02138, USA
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4
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Trinh KTL, Thai DA, Yang DH, Lee NY. Chitosan: a green adhesive for surface functionalization and fabrication of thermoplastic biomedical microdevices. LAB ON A CHIP 2023; 23:4245-4254. [PMID: 37655654 DOI: 10.1039/d3lc00500c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
Chitosan (CS) is a natural polymer that exhibits many biological properties and is used as a biomaterial for antibacterial coatings, tissue engineering, cell research, drug delivery, and negatively charged molecule capture. In our previous study, we used a CS-polydopamine mixture to realize UV-assisted bonding between poly(methyl methacrylate) (PMMA) substrates to fabricate microdevices for self-assembled stem cell spheroid cultures. Herein, we attained reliable adhesive bonding between PMMAs using CS at room temperature assisted by oxygen plasma. The bond strength of adhesion was as high as 2.1 MPa, which could be stable for over two months according to the leak test. The adhesive bonding and surface functionalization of the microchannels were simultaneously completed such that the microdevices could be directly used for mesenchymal stem cell culture for spheroid generation and DNA purification for point-of-care testing (POCT) devices. Surface characterization was performed by contact angle measurements, Fourier-transform infrared spectroscopy, scanning electron microscopy, and atomic force microscopy. The POCT device allows sequential on-chip DNA purification, amplification, and colorimetric detection of pathogenic bacteria. This method provides a convenient and reliable strategy for the fabrication of PMMA microdevices that can be directly implemented in biological studies and POCT applications without involving prior surface modification steps.
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Affiliation(s)
- Kieu The Loan Trinh
- BioNano Applications Research Center, Gachon University 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do, 13120, Korea
| | - Duc Anh Thai
- Department of BioNano Technology, Gachon University 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do, 13120, Korea.
| | - Da Hyun Yang
- Department of BioNano Technology, Gachon University 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do, 13120, Korea.
| | - Nae Yoon Lee
- Department of BioNano Technology, Gachon University 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do, 13120, Korea.
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5
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Azuaje-Hualde E, Komen J, Alonso-Cabrera JA, van den Berg A, de Pancorbo MM, van der Meer AD, Benito-Lopez F, Basabe-Desmonts L. Cell Patterning Technology on Polymethyl Methacrylate through Controlled Physicochemical and Biochemical Functionalization. BIOSENSORS 2023; 13:904. [PMID: 37887097 PMCID: PMC10604931 DOI: 10.3390/bios13100904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 09/14/2023] [Accepted: 09/19/2023] [Indexed: 10/28/2023]
Abstract
In recent years, innovative cell-based biosensing systems have been developed, showing impact in healthcare and life science research. Now, there is a need to design mass-production processes to enable their commercialization and reach society. However, current protocols for their fabrication employ materials that are not optimal for industrial production, and their preparation requires several chemical coating steps, resulting in cumbersome protocols. We have developed a simplified two-step method for generating controlled cell patterns on PMMA, a durable and transparent material frequently employed in the mass manufacturing of microfluidic devices. It involves air plasma and microcontact printing. This approach allows the formation of well-defined cell arrays on PMMA without the need for blocking agents to define the patterns. Patterns of various adherent cell types in dozens of individual cell cultures, allowing the regulation of cell-material and cell-cell interactions, were developed. These cell patterns were integrated into a microfluidic device, and their viability for more than 20 h under controlled flow conditions was demonstrated. This work demonstrated the potential to adapt polymeric cytophobic materials to simple fabrication protocols of cell-based microsystems, leveraging the possibilities for commercialization.
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Affiliation(s)
- Enrique Azuaje-Hualde
- Microfluidics Cluster UPV/EHU, BIOMICs Microfluidics Group, Lascaray Research Center, University of the Basque Country UPV/EHU, 01006 Vitoria-Gasteiz, Spain; (E.A.-H.); (J.A.A.-C.)
- Bioaraba Health Research Institute, Microfluidics Cluster UPV/EHU, 01009 Vitoria-Gasteiz, Spain
| | - Job Komen
- BIOS Lab on a Chip Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands; (J.K.); (A.v.d.B.)
| | - Juncal A. Alonso-Cabrera
- Microfluidics Cluster UPV/EHU, BIOMICs Microfluidics Group, Lascaray Research Center, University of the Basque Country UPV/EHU, 01006 Vitoria-Gasteiz, Spain; (E.A.-H.); (J.A.A.-C.)
- Microfluidics Cluster UPV/EHU, Analytical Microsystems & Materials for Lab-on-a-Chip (AMMa-LOAC) Group, Analytical Chemistry Department, University of the Basque Country UPV/EHU, 48940 Leioa, Spain
| | - Albert van den Berg
- BIOS Lab on a Chip Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands; (J.K.); (A.v.d.B.)
| | - Marian M. de Pancorbo
- BIOMICs Research Group, Lascaray Research Center, University of the Basque Country UPV/EHU, 01006 Vitoria-Gasteiz, Spain;
| | - Andries D. van der Meer
- Applied Stem Cell Technologies, TechMed Centre, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands;
| | - Fernando Benito-Lopez
- Bioaraba Health Research Institute, Microfluidics Cluster UPV/EHU, 01009 Vitoria-Gasteiz, Spain
- Microfluidics Cluster UPV/EHU, Analytical Microsystems & Materials for Lab-on-a-Chip (AMMa-LOAC) Group, Analytical Chemistry Department, University of the Basque Country UPV/EHU, 48940 Leioa, Spain
| | - Lourdes Basabe-Desmonts
- Microfluidics Cluster UPV/EHU, BIOMICs Microfluidics Group, Lascaray Research Center, University of the Basque Country UPV/EHU, 01006 Vitoria-Gasteiz, Spain; (E.A.-H.); (J.A.A.-C.)
- Bioaraba Health Research Institute, Microfluidics Cluster UPV/EHU, 01009 Vitoria-Gasteiz, Spain
- Basque Foundation of Science, IKERBASQUE, María Díaz Haroko Kalea, 3, 48013 Bilbao, Spain
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6
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Fazil S, Liaqat K, Rehman W, Abdellatif MH. Synthesis and Characterization of Electrical and Thermal Conductive Vinyltriethoxysilane Functionalized Graphene Oxide/Poly (Methyl Methacrylate) Nanocomposite Films. MEMBRANES 2023; 13:609. [PMID: 37367813 DOI: 10.3390/membranes13060609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 12/03/2022] [Accepted: 12/05/2022] [Indexed: 06/28/2023]
Abstract
The present study is an attempt to improve thermal, mechanical and electrical properties of poly (methyl methacrylate) (PMMA). For this purpose, vinyltriethoxysilane (VTES) was grafted covalently on the surface of graphene oxide (GO). This VTES functionalized graphene oxide (VGO) was dispersed in the PMMA matrix using the solution casting method. The morphology of the resultant PMMA/VGO nanocomposites was analyzed by SEM indicating well-dispersed VGO in the PMMA matrix. Thermal stability, tensile strength and thermal conductivity increased by 90%, 91% and 75%, respectively, whereas volume electrical resistivity and surface electrical resistivity reduced to 9.45 × 105 Ω/cm and 5.45 × 107 Ω/cm2, respectively.
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Affiliation(s)
- Srosh Fazil
- Department of Chemistry, University of Poonch Rawalakot, Rawalakot 12350, Azad Kashmir, Pakistan
| | - Khurram Liaqat
- Department of Chemistry, University of Poonch Rawalakot, Rawalakot 12350, Azad Kashmir, Pakistan
| | - Wajid Rehman
- Department of Chemistry, Hazara University Mansehra, Mansehra 21120, Khyber Pakhtunkhwa, Pakistan
| | - Magda H Abdellatif
- Department of Chemistry, College of Sciences, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
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7
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Pan J, Zhang W, Zhu J, Tan J, Huang Y, Mo K, Tong Y, Xie Z, Ke Y, Zheng H, Ouyang H, Shi X, Gao L. Arrested Phase Separation Enables High-Performance Keratoprostheses. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2207750. [PMID: 36680510 DOI: 10.1002/adma.202207750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 12/24/2022] [Indexed: 06/17/2023]
Abstract
Corneal transplantation is impeded by donor shortages, immune rejection, and ethical reservations. Pre-made cornea prostheses (keratoprostheses) offer a proven option to alleviate these issues. Ideal keratoprostheses must possess optical clarity and mechanical robustness, but also high permeability, processability, and recyclability. Here, it is shown that rationally controlling the extent of arrested phase separation can lead to optimized multiscale structure that reconciles permeability and transparency, a previously conflicting goal by common pore-forming strategies. The process is simply accomplished by hydrothermally treating a dense and transparent hydrophobic association hydrogel. The examination of multiscale structure evolution during hydrothermal treatment reveals that the phase separation with upper miscibility gap evolves to confer time-dependent pore growth due to slow dynamics of polymer-rich phase which is close to vitrification. Such a process can render a combination of multiple desired properties that equal or surpass those of the state-of-the-art keratoprostheses. In vivo tests confirm that the keratoprosthesis can effectively repair corneal perforation and restore a transparent cornea with treatment outcomes akin to that of allo-keratoplasty. The keratoprosthesis is easy to access and convenient to carry, and thus would be an effective temporary substitute for a corneal allograft in emergency conditions.
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Affiliation(s)
- Jiageng Pan
- School of Chemical Engineering and Light Industry, Gangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Wang Zhang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, 510060, P. R. China
| | - Jin Zhu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, 510060, P. R. China
| | - Jieying Tan
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, 510060, P. R. China
| | - Ying Huang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, 510060, P. R. China
| | - Kunlun Mo
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, 510060, P. R. China
| | - Yan Tong
- School of Materials, Sun Yat-sen University, Guangzhou, 510060, P. R. China
| | - Zhenhua Xie
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, P. R. China
- Spallation Neutron Source Science Center, Dongguan, 523803, P. R. China
| | - Yubin Ke
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, P. R. China
- Spallation Neutron Source Science Center, Dongguan, 523803, P. R. China
| | - Huade Zheng
- School of Materials Science and Engineering, South China University of Technology, Guanghzhou, 510640, P. R. China
| | - Hong Ouyang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, 510060, P. R. China
| | - Xuetao Shi
- School of Materials Science and Engineering, South China University of Technology, Guanghzhou, 510640, P. R. China
| | - Liang Gao
- School of Chemical Engineering and Light Industry, Gangdong University of Technology, Guangzhou, 510006, P. R. China
- Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory (Rongjiang Laboratory), Jieyang, 515200, P. R. China
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8
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Glow discharge plasma stabilization of azo dye on PMMA polymer. Sci Rep 2022; 12:18358. [PMID: 36319721 PMCID: PMC9626643 DOI: 10.1038/s41598-022-21855-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 10/04/2022] [Indexed: 11/28/2022] Open
Abstract
The effects of argon gas glow discharge plasma on the surface of DR1 dye-loaded PMMA polymer films are examined in this work. Plasma immobilizes the dye on the surface of polymer without using stabilizers. Argon plasma activates the surface through breaking some bonds and generation of radical sites. It affects the acrylate groups of PMMA leading to covalent bonds between dye and surface of polymer. In addition, plasma treatment and contact with ambient air may result in the creation of new polar components, such as carbonyl and carboxyl compounds and links that enhance the dye attachment to the polymer matrix. Besides, the dye adsorption on the polymer film is impacted by changes in surface topography. Furthermore, plasma modifies the dye conformation, which affects the adherence of the dye to the polymer surface through bringing the dye to the higher energy state. The chemical and topographical modification of dye-loaded PMMA films by plasma are investigated by spectroscopic and AFM methods. Furthermore, aging process was used to confirm dye retention on the polymer film after plasma modification as opposed to dye-loaded polymer film that was left untreated as a reference sample. Finally, investigated method suggests a novel and very affordable technique for fabrication of poly(MMA-co-DR1) copolymer in the form of a homogeneous surface layer.
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9
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Dalsbecker P, Beck Adiels C, Goksör M. Liver-on-a-chip devices: the pros and cons of complexity. Am J Physiol Gastrointest Liver Physiol 2022; 323:G188-G204. [PMID: 35819853 DOI: 10.1152/ajpgi.00346.2021] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Physiologically relevant and broadly applicable liver cell culture platforms are of great importance in both drug development and disease modeling. Organ-on-a-chip systems offer a promising alternative to conventional, static two-dimensional (2-D) cultures, providing much-needed cues such as perfusion, shear stress, and three-dimensional (3-D) cell-cell communication. However, such devices cover a broad range of complexity both in manufacture and in implementation. In this review, we summarize the key features of the human liver that should be reflected in a physiologically relevant liver-on-a-chip model. We also discuss different material properties of importance in producing liver-on-a-chip devices and summarize recent and current progress in the field, highlighting different types of devices at different levels of complexity.
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Affiliation(s)
| | | | - Mattias Goksör
- Department of Physics, University of Gothenburg, Gothenburg, Sweden
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10
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Delivery of Cells to the Cornea Using Synthetic Biomaterials. Cornea 2022; 41:1325-1336. [DOI: 10.1097/ico.0000000000003094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Accepted: 05/24/2022] [Indexed: 11/26/2022]
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11
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Galateanu B, Hudita A, Biru EI, Iovu H, Zaharia C, Simsensohn E, Costache M, Petca RC, Jinga V. Applications of Polymers for Organ-on-Chip Technology in Urology. Polymers (Basel) 2022; 14:1668. [PMID: 35566836 PMCID: PMC9105302 DOI: 10.3390/polym14091668] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Revised: 04/05/2022] [Accepted: 04/18/2022] [Indexed: 02/07/2023] Open
Abstract
Organ-on-chips (OOCs) are microfluidic devices used for creating physiological organ biomimetic systems. OOC technology brings numerous advantages in the current landscape of preclinical models, capable of recapitulating the multicellular assemblage, tissue-tissue interaction, and replicating numerous human pathologies. Moreover, in cancer research, OOCs emulate the 3D hierarchical complexity of in vivo tumors and mimic the tumor microenvironment, being a practical cost-efficient solution for tumor-growth investigation and anticancer drug screening. OOCs are compact and easy-to-use microphysiological functional units that recapitulate the native function and the mechanical strain that the cells experience in the human bodies, allowing the development of a wide range of applications such as disease modeling or even the development of diagnostic devices. In this context, the current work aims to review the scientific literature in the field of microfluidic devices designed for urology applications in terms of OOC fabrication (principles of manufacture and materials used), development of kidney-on-chip models for drug-toxicity screening and kidney tumors modeling, bladder-on-chip models for urinary tract infections and bladder cancer modeling and prostate-on-chip models for prostate cancer modeling.
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Affiliation(s)
- Bianca Galateanu
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei Street, 050095 Bucharest, Romania; (B.G.); (M.C.)
| | - Ariana Hudita
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei Street, 050095 Bucharest, Romania; (B.G.); (M.C.)
| | - Elena Iuliana Biru
- Advanced Polymer Materials Group, Department of Bioresources and Polymer Science, University Politehnica of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania; (H.I.); (C.Z.)
| | - Horia Iovu
- Advanced Polymer Materials Group, Department of Bioresources and Polymer Science, University Politehnica of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania; (H.I.); (C.Z.)
- Academy of Romanian Scientists, Ilfov Street, 50044 Bucharest, Romania
| | - Catalin Zaharia
- Advanced Polymer Materials Group, Department of Bioresources and Polymer Science, University Politehnica of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania; (H.I.); (C.Z.)
| | - Eliza Simsensohn
- “Carol Davila” University of Medicine and Pharmacy Bucharest, 050474 Bucharest, Romania; (E.S.); (R.-C.P.); (V.J.)
| | - Marieta Costache
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei Street, 050095 Bucharest, Romania; (B.G.); (M.C.)
| | - Razvan-Cosmin Petca
- “Carol Davila” University of Medicine and Pharmacy Bucharest, 050474 Bucharest, Romania; (E.S.); (R.-C.P.); (V.J.)
| | - Viorel Jinga
- “Carol Davila” University of Medicine and Pharmacy Bucharest, 050474 Bucharest, Romania; (E.S.); (R.-C.P.); (V.J.)
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12
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Azim N, Orrico JF, Appavoo D, Zhai L, Rajaraman S. Polydopamine surface functionalization of 3D printed resin material for enhanced polystyrene adhesion towards insulation layers for 3D microelectrode arrays (3D MEAs). RSC Adv 2022; 12:25605-25616. [PMID: 36320408 PMCID: PMC9493467 DOI: 10.1039/d2ra03911g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Accepted: 08/16/2022] [Indexed: 12/05/2022] Open
Abstract
3D printing involves the use of photopolymerizable resins, which are toxic and typically have incompatible properties with materials such as polystyrene (PS), which present limitations for biomedical applications. We present a method to dramatically improve the poor adhesion between the PS insulative layer on 3D printed Microelectrode Array (MEA) substrates by functionalizing the resin surface with polydopamine (PDA), a mussel-inspired surface chemistry derivative. A commercial 3D printing prepolymer resin, FormLabs Clear (FLC), was printed using a digital light processing (DLP) printer and then surface functionalized with PDA by alkali-induced aqueous immersion deposition and self-polymerization. It was observed that the adhesion of the PS to FLC was improved due to the precision emanating from the DLP method and further improved after the functionalization of DLP printed substrates with PDA at 1, 12, and 24 h time intervals. The adhesion of PS was evaluated through scotch tape peel testing and instron measurements of planar substrates and incubation testing with qualitative analysis of printed culture wells. The composition and topology of the samples were studied to understand how the properties of the surface change after PDA functionalization and how this contributes to the overall improvement in PS adhesion. Furthermore, the surface energies at each PDA deposition time were calculated from contact angle studies as it related to adhesion. Finally, biocompatibility assays of the newly modified surfaces were performed using mouse cardiac cells (HL-1) to demonstrate the biocompatibility of the PDA functionalization process. PDA surface functionalization of 3D DLP printed FLC resin resulted in a dramatic improvement of thin film PS adhesion and proved to be a biocompatible solution for improving additive manufacturing processes to realize biosensors such as in vitro MEAs. 3D printing involves the use of toxic photopolymerizable resins which typically have incompatible properties with polystyrene for biomedical applications. Herein, we use 3D printing tricks and polydopamine to dramatically improve adhesion.![]()
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Affiliation(s)
- Nilab Azim
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, USA
- Department of Chemistry, University of Central Florida, Orlando, FL, 32826, USA
| | - Julia Freitas Orrico
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, USA
| | - Divambal Appavoo
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, USA
| | - Lei Zhai
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, USA
- Department of Chemistry, University of Central Florida, Orlando, FL, 32826, USA
| | - Swaminathan Rajaraman
- NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, USA
- Department of Materials Science & Engineering, University of Central Florida, Orlando, FL, 32826, USA
- Department of Electrical & Computer Engineering, University of Central Florida, Orlando, FL, 32826, USA
- Burnett School of Biomedical Sciences, University of Central Florida, Orlando, FL, 32826, USA
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13
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Poudel BK, Robert MC, Simpson FC, Malhotra K, Jacques L, LaBarre P, Griffith M. In situ Tissue Regeneration in the Cornea from Bench to Bedside. Cells Tissues Organs 2021; 211:506-526. [PMID: 34380144 DOI: 10.1159/000514690] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Accepted: 01/22/2021] [Indexed: 11/19/2022] Open
Abstract
Corneal blindness accounts for 5.1% of visual deficiency and is the fourth leading cause of blindness globally. An additional 1.5-2 million people develop corneal blindness each year, including many children born with or who later develop corneal infections. Over 90% of corneal blind people globally live in low- and middle-income regions (LMIRs), where corneal ulcers are approximately 10-fold higher compared to high-income countries. While corneal transplantation is an effective option for patients in high-income countries, there is a considerable global shortage of corneal graft tissue and limited corneal transplant programs in many LMIRs. In situ tissue regeneration aims to restore diseases or damaged tissues by inducing organ regeneration. This can be achieved in the cornea using biomaterials based on extracellular matrix (ECM) components like collagen, hyaluronic acid, and silk. Solid corneal implants based on recombinant human collagen type III were successfully implanted into patients resulting in regeneration of the corneal epithelium, stroma, and sub-basal nerve plexus. As ECM crosslinking and manufacturing methods improve, the focus of biomaterial development has shifted to injectable, in situ gelling formulations. Collagen, collagen-mimetic, and gelatin-based in situ gelling formulas have shown the ability to repair corneal wounds, surgical incisions, and perforations in in-vivo models. Biomaterial approaches may not be sufficient to treat inflammatory conditions, so other cell-free therapies such as treatment with tolerogenic exosomes and extracellular vesicles may improve treatment outcomes. Overall, many of the technologies described here show promise as future medical devices or combination products with cell or drug-based therapies. In situ tissue regeneration, particularly with liquid formulas, offers the ability to triage and treat corneal injuries and disease with a single regenerative solution, providing alternatives to organ transplantation and improving patient outcomes.
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Affiliation(s)
- Bijay K Poudel
- Département d'Ophtalmologie, Université de Montréal, Montréal, Québec, Canada.,Centre de Recherche, Hôpital Maisonneuve-Rosemont, Montréal, Québec, Canada
| | - Marie-Claude Robert
- Département d'Ophtalmologie, Université de Montréal, Montréal, Québec, Canada.,Centre de Recherche, Hôpital Maisonneuve-Rosemont, Montréal, Québec, Canada.,Département d'Opthalmologie, Centre hospitalier de l'Université de Montréal, Montréal, Québec, Canada
| | - Fiona C Simpson
- Département d'Ophtalmologie, Université de Montréal, Montréal, Québec, Canada.,Centre de Recherche, Hôpital Maisonneuve-Rosemont, Montréal, Québec, Canada.,Département d'Opthalmologie, Centre hospitalier de l'Université de Montréal, Montréal, Québec, Canada.,Institut du Génie Biomédicale, Université de Montréal, Montréal, Québec, Canada
| | - Kamal Malhotra
- Département d'Ophtalmologie, Université de Montréal, Montréal, Québec, Canada.,Centre de Recherche, Hôpital Maisonneuve-Rosemont, Montréal, Québec, Canada.,Département d'Opthalmologie, Centre hospitalier de l'Université de Montréal, Montréal, Québec, Canada
| | - Ludovic Jacques
- Département d'Ophtalmologie, Université de Montréal, Montréal, Québec, Canada.,Centre de Recherche, Hôpital Maisonneuve-Rosemont, Montréal, Québec, Canada
| | | | - May Griffith
- Département d'Ophtalmologie, Université de Montréal, Montréal, Québec, Canada.,Centre de Recherche, Hôpital Maisonneuve-Rosemont, Montréal, Québec, Canada.,Département d'Opthalmologie, Centre hospitalier de l'Université de Montréal, Montréal, Québec, Canada.,Institut du Génie Biomédicale, Université de Montréal, Montréal, Québec, Canada
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14
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Zaw HKK, Vasilieva TM, Htun YH, Oo AK, Shikova TG. Comparison of Chemical Composition and Hydrophilic Properties of Surfaces of Organic Polymers Treated in Various Low-Temperature Plasmas. HIGH ENERGY CHEMISTRY 2021. [DOI: 10.1134/s0018143921040135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Catterton MA, Montalbine AN, Pompano RR. Selective Fluorination of the Surface of Polymeric Materials after Stereolithography 3D Printing. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:7341-7348. [PMID: 34115509 PMCID: PMC8564629 DOI: 10.1021/acs.langmuir.1c00625] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
With the microfluidics community embracing 3D resin printing as a rapid fabrication method, controlling surface chemistry has emerged as a new challenge. Fluorination of 3D-printed surfaces is highly desirable in many applications due to chemical inertness, low friction coefficients, antifouling properties, and the potential for selective hydrophobic patterning. Despite sporadic reports, silanization methods have not been optimized for covalent bonding with polymeric resins. As a case study, we tested the silanization of a commercially available (meth)acrylate-based resin (BV-007A) with a fluoroalkyl trichlorosilane. Interestingly, plasma oxidation was unnecessary for silanization of this resin and indeed was ineffective. Solvent-based deposition in a fluorinated oil (FC-40) generated significantly higher contact angles than deposition in ethanol or gas-phase deposition, yielding hydrophobic surfaces with contact angle >110° under optimized conditions. Attenuated total reflectance-Fourier transform infrared spectroscopy indicated that the increase in the contact angle correlated with consumption of a carbonyl moiety, suggesting covalent bonding of silane without plasma oxidation. Consistent with a covalent bond, silanization was resistant to mechanical damage and hydrolysis in methanol and was stable over long-term storage. When tested on a suite of photocrosslinkable resins, this silanization protocol generated highly hydrophobic surfaces (contact angle > 110°) on three resins and moderate hydrophobicity (90-100°) on the remainder. Selective patterning of hydrophobic regions in an open 3D-printed microchannel was possible in combination with simple masking techniques. Thus, this facile fluorination strategy is expected to be applicable for resin-printed materials in a variety of contexts including micropatterning and multiphase microfluidics.
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16
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Surface modification of PMMA polymer and its composites with PC 61BM fullerene derivative using an atmospheric pressure microwave argon plasma sheet. Sci Rep 2021; 11:9270. [PMID: 33927242 PMCID: PMC8084952 DOI: 10.1038/s41598-021-88553-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Accepted: 04/14/2021] [Indexed: 11/26/2022] Open
Abstract
This paper presents the results of experimental investigations of the plasma surface modification of a poly(methyl methacrylate) (PMMA) polymer and PMMA composites with a [6,6]-phenyl-C61-butyric acid methyl ester fullerene derivative (PC61BM). An atmospheric pressure microwave (2.45 GHz) argon plasma sheet was used. The experimental parameters were: an argon (Ar) flow rate (up to 20 NL/min), microwave power (up to 530 W), number of plasma scans (up to 3) and, the kind of treated material. In order to assess the plasma effect, the possible changes in the wettability, roughness, chemical composition, and mechanical properties of the plasma-treated samples’ surfaces were evaluated by water contact angle goniometry (WCA), atomic force microscopy (AFM), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS). The best result concerning the water contact angle reduction was from 83° to 29.7° for the PMMA material. The ageing studies of the PMMA plasma-modified surface showed long term (100 h) improved wettability. As a result of plasma treating, changes in the samples surface roughness parameters were observed, however their dependence on the number of plasma scans is irregular. The ATR-FTIR spectra of the PMMA plasma-treated surfaces showed only slight changes in comparison with the spectra of an untreated sample. The more significant differences were demonstrated by XPS measurements indicating the surface chemical composition changes after plasma treatment and revealing the oxygen to carbon ratio increase from 0.1 to 0.4.
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17
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Sharifi S, Islam MM, Sharifi H, Islam R, Nilsson PH, Dohlman CH, Mollnes TE, Paschalis EI, Chodosh J. Sputter Deposition of Titanium on Poly(Methyl Methacrylate) Enhances Corneal Biocompatibility. Transl Vis Sci Technol 2020; 9:41. [PMID: 33442495 PMCID: PMC7774111 DOI: 10.1167/tvst.9.13.41] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Accepted: 11/15/2020] [Indexed: 02/07/2023] Open
Abstract
Purpose To evaluate titanium (Ti) sputtering of the poly(methyl methacrylate) (PMMA) stem of the Boston Keratoprosthesis (BK) as a method to enhance interfacial adhesion between the PMMA and the recipient corneal tissue. Methods PMMA specimens were plasma treated with Ar/O2 and coated with Ti using a DC magnetron sputtering instrument. The topography and hydrophilicity of the surfaces were characterized using atomic force microscopy and a water contact angle instrument, respectively. Scratch hardness and adhesion of the Ti film were measured using a mechanical tester. Biocompatibility assessments were performed using cultured human corneal fibroblasts and whole blood ex vivo. The optical quality of the Ti sputtered BK was evaluated using a custom-made optical bench. Results By contact angle studies, the Ti coating improved PMMA hydrophilicity to match that of medical-grade Ti (Ti-6Al-4V-ELI). Ti sputtering of contact surfaces resulted in a plate-like morphology with increased surface roughness, without impacting the transparency of the BK optical component. Scratch testing indicated that the mechanical behavior of the Ti coating was similar to that of casted Ti, and the coating was stable in pull-off adhesion testing. Sputtered Ti film was highly biocompatible based on tests of cell viability, adhesion, proliferation, differentiation, collagen deposition, and keratocan expression, the properties of which exceeded those of uncoated PMMA and did not induce increased complement activation. Conclusions Titanium coating of the BK stem generated a mechanically and biologically favorable interface, which may help to enhance corneal stromal adhesion and biocompatibility. Translational Relevance Improving the biocompatibility of the BK PMMA stem may improve long-term outcomes of implantation.
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Affiliation(s)
- Sina Sharifi
- Disruptive Technology Laboratory and Schepens Eye Research Institute, Massachusetts Eye and Ear; Department of Ophthalmology, Harvard Medical School, Boston, MA, USA
| | - Mohammad Mirazul Islam
- Disruptive Technology Laboratory and Schepens Eye Research Institute, Massachusetts Eye and Ear; Department of Ophthalmology, Harvard Medical School, Boston, MA, USA
| | - Hannah Sharifi
- Disruptive Technology Laboratory and Schepens Eye Research Institute, Massachusetts Eye and Ear; Department of Ophthalmology, Harvard Medical School, Boston, MA, USA
| | - Rakibul Islam
- Department of Immunology, Oslo University Hospital, Rikshospitalet, University of Oslo, Oslo, Norway
| | - Per H Nilsson
- Department of Immunology, Oslo University Hospital, Rikshospitalet, University of Oslo, Oslo, Norway.,Linnaeus Center for Biomaterials Chemistry, Linnaeus University, Kalmar, Sweden
| | - Claes H Dohlman
- Disruptive Technology Laboratory and Schepens Eye Research Institute, Massachusetts Eye and Ear; Department of Ophthalmology, Harvard Medical School, Boston, MA, USA
| | - Tom Eirik Mollnes
- Department of Immunology, Oslo University Hospital, Rikshospitalet, University of Oslo, Oslo, Norway.,Research Laboratory, Nordland Hospital, Bodø, Norway; Faculty of Health Sciences, K.G. Jebsen TREC, University of Tromsø, Tromsø, Norway.,Centre of Molecular Inflammation Research, Norwegian University of Science and Technology, Trondheim, Norway
| | - Eleftherios I Paschalis
- Disruptive Technology Laboratory and Schepens Eye Research Institute, Massachusetts Eye and Ear; Department of Ophthalmology, Harvard Medical School, Boston, MA, USA
| | - James Chodosh
- Disruptive Technology Laboratory and Schepens Eye Research Institute, Massachusetts Eye and Ear; Department of Ophthalmology, Harvard Medical School, Boston, MA, USA
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18
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Biomimetic vs. Direct Approach to Deposit Hydroxyapatite on the Surface of Low Melting Point Polymers for Tissue Engineering. NANOMATERIALS 2020; 10:nano10112162. [PMID: 33138141 PMCID: PMC7693928 DOI: 10.3390/nano10112162] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 10/24/2020] [Accepted: 10/27/2020] [Indexed: 01/27/2023]
Abstract
Polymers are widely used in many applications in the field of biomedical engineering. Among eclectic selections of polymers, those with low melting temperature (Tm < 200 °C), such as poly(methyl methacrylate), poly(lactic-co-glycolic acid), or polyethylene, are often used in bone, dental, maxillofacial, and corneal tissue engineering as substrates or scaffolds. These polymers, however, are bioinert, have a lack of reactive surface functional groups, and have poor wettability, affecting their ability to promote cellular functions and biointegration with the surrounding tissue. Improving the biointegration can be achieved by depositing hydroxyapatite (HAp) on the polymeric substrates. Conventional thermal spray and vapor phase coating, including the Food and Drug Administration (FDA)-approved plasma spray technique, is not suitable for application on the low Tm polymers due to the high processing temperature, reaching more than 1000 °C. Two non-thermal HAp coating approaches have been described in the literature, namely, the biomimetic deposition and direct nanoparticle immobilization techniques. In the current review, we elaborate on the unique features of each technique, followed by discussing the advantages and disadvantages of each technique to help readers decide on which method is more suitable for their intended applications. Finally, the future perspectives of the non-thermal HAp coating are given in the conclusion.
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19
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Chen YH, Lin DC, Chern E, Huang YY. The use of micro-needle arrays to deliver cells for cellular therapies. Biomed Microdevices 2020; 22:63. [PMID: 32889555 DOI: 10.1007/s10544-020-00518-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Cell therapy is used to treat various diseases and to repair injuries. Cell delivery is a crucial process that delivers cells to target sites. Cells must be precisely delivered to a target site and the cells that are delivered must be localized to the target site to repair damaged tissue. For stem cell therapy, the most convenient method of cell delivery involves directly injecting cells into damaged tissue. Other strategies use carriers to transplant stem cells into damaged tissue. These are termed, stem cell delivery systems (SCDSs). Micro-needle arrays are minimally invasive transdermal delivery systems. The devices can pass through the stratum corneum barrier and deliver macromolecules into the skin. They can also access the microcirculation system in the skin. This study fabricates PMMA micro-needle using a two-stage micro-molding method. Cells are seeded on the micro-needle arrays and then transferred into the target tissue. Collagen hydrogel is used as a model biomimetic tissue. Cells are efficiently delivered to regions of interest, collagen hydrogel, by using this system. The delivery rate is about 83.2%. This demonstrates that micro-needle arrays allow very efficient delivery of cells.
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Affiliation(s)
- Ying-Hou Chen
- Department of Biomedical Engineering, College of Engineering, College of Medicine, National Taiwan University, No.1, Sec.1, Jen-Ai Road, Taipei, Taiwan
| | - Dai-Chi Lin
- Department of Biomedical Engineering, College of Engineering, College of Medicine, National Taiwan University, No.1, Sec.1, Jen-Ai Road, Taipei, Taiwan
| | - Edward Chern
- Department of Biochemical Science and Technology, National Taiwan University, Taipei, Taiwan
| | - Yi-You Huang
- Department of Biomedical Engineering, College of Engineering, College of Medicine, National Taiwan University, No.1, Sec.1, Jen-Ai Road, Taipei, Taiwan.
- Department of Biomedical Engineering, National Taiwan University Hospital, Taipei, Taiwan.
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20
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Riau AK, Lwin NC, Gelfand L, Hu H, Liedberg B, Chodosh J, Venkatraman SS, Mehta JS. Surface modification of corneal prosthesis with nano-hydroxyapatite to enhance in vivo biointegration. Acta Biomater 2020; 107:299-312. [PMID: 31978623 DOI: 10.1016/j.actbio.2020.01.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 01/15/2020] [Accepted: 01/16/2020] [Indexed: 12/11/2022]
Abstract
The majority of clinical corneal prostheses (KPros) adopt a core-skirt configuration. This configuration is favored owing to the optic core (generally a cylindrical, acrylic-based material, such as PMMA), that not only provides a clear window for the patients' vision, but also confers resistance to biodegradability. The surrounding skirt (typically a biological material, such as corneal tissue) allows for host tissue integration. However, due to poor biointegration between the dissimilar core and skirt materials, it results in a weak adhesion at the interface, giving rise to clinical complications, such as bacterial infections in the tissue-PMMA interface and device extrusion. Here, we physically immobilized nano-hydroxyapatite (nHAp) on a PMMA cylinder via a dip-coating technique, to create a bioactive surface that improved biointegration in vivo. We established that the nHAp coating was safe and stable in the rabbit cornea over five weeks. More importantly, we found that apoptotic, wound healing and inflammatory responses to nHAp-coated PMMA were substantially milder than to non-coated PMMA. More mature collagen, similar to the non-operated cornea, was maintained in the corneal stroma adjacent to the nHAp-coated implant edge. However, around the non-coated cylinder, an abundant new and loose connective tissue formed, similar to bone tissue response to bioinert scaffolds. As a result of superior biointegration, tissue adhesion with nHAp-coated PMMA cylinders was also significantly enhanced compared to non-coated cylinders. This study set a precedent for the future application of the nHAp coating on clinical KPros. STATEMENT OF SIGNIFICANCE: Currently, all clinical corneal prostheses utilize as-manufactured, non-surface modified PMMA optic cylinder. The bioinert cylinder, however, has poor biointegration and adhesion with the surrounding biological tissue, which can give rise to postoperative complications, such as microbial invasion in the tissue-PMMA loose interface and PMMA optic cylinder extrusion. In the current study, we showed that surface modification of the PMMA cylinder with bioactive nano-hydroxyapatite (nHAp) significantly enhanced its biointegration with corneal stromal tissue in vivo. The superior biointegration of the nHAp-coated PMMA was signified by a more attenuated corneal wound healing, inflammatory and fibrotic response, and better tissue apposition, as well as a significantly improved corneal stromal tissue adhesion when compared to the non-coated PMMA.
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21
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Sun W, Liu W, Wu Z, Chen H. Chemical Surface Modification of Polymeric Biomaterials for Biomedical Applications. Macromol Rapid Commun 2020; 41:e1900430. [DOI: 10.1002/marc.201900430] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 02/08/2020] [Accepted: 02/16/2020] [Indexed: 12/12/2022]
Affiliation(s)
- Wei Sun
- College of ChemistryChemical Engineering and Materials ScienceCollaborative Innovation Center for New Type Urbanization and Social Governance of Jiangsu ProvinceSoochow University Suzhou 215123 P. R. China
| | - Wenying Liu
- College of ChemistryChemical Engineering and Materials ScienceCollaborative Innovation Center for New Type Urbanization and Social Governance of Jiangsu ProvinceSoochow University Suzhou 215123 P. R. China
| | - Zhaoqiang Wu
- College of ChemistryChemical Engineering and Materials ScienceCollaborative Innovation Center for New Type Urbanization and Social Governance of Jiangsu ProvinceSoochow University Suzhou 215123 P. R. China
| | - Hong Chen
- College of ChemistryChemical Engineering and Materials ScienceCollaborative Innovation Center for New Type Urbanization and Social Governance of Jiangsu ProvinceSoochow University Suzhou 215123 P. R. China
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22
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Riau AK, Aung TT, Setiawan M, Yang L, Yam GHF, Beuerman RW, Venkatraman SS, Mehta JS. Surface Immobilization of Nano-Silver on Polymeric Medical Devices to Prevent Bacterial Biofilm Formation. Pathogens 2019; 8:E93. [PMID: 31261752 PMCID: PMC6789847 DOI: 10.3390/pathogens8030093] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 06/25/2019] [Accepted: 06/27/2019] [Indexed: 01/22/2023] Open
Abstract
: Bacterial biofilm on medical devices is difficult to eradicate. Many have capitalized the anti-infective capability of silver ions (Ag+) by incorporating nano-silver (nAg) in a biodegradable coating, which is then laid on polymeric medical devices. However, such coating can be subjected to premature dissolution, particularly in harsh diseased tissue microenvironment, leading to rapid nAg clearance. It stands to reason that impregnating nAg directly onto the device, at the surface, is a more ideal solution. We tested this concept for a corneal prosthesis by immobilizing nAg and nano-hydroxyapatite (nHAp) on poly(methyl methacrylate), and tested its biocompatibility with human stromal cells and antimicrobial performance against biofilm-forming pathogens, Pseudomonas aeruginosa and Staphylococcus aureus. Three different dual-functionalized substrates-high Ag (referred to as 75:25 HAp:Ag); intermediate Ag (95:5 HAp:Ag); and low Ag (99:1 HAp:Ag) were studied. The 75:25 HAp:Ag was effective in inhibiting biofilm formation, but was cytotoxic. The 95:5 HAp:Ag showed the best selectivity among the three substrates; it prevented biofilm formation of both pathogens and had excellent biocompatibility. The coating was also effective in eliminating non-adherent bacteria in the culture media. However, a 28-day incubation in artificial tear fluid revealed a ~40% reduction in Ag+ release, compared to freshly-coated substrates. The reduction affected the inhibition of S. aureus growth, but not the P. aeruginosa. Our findings suggest that Ag+ released from surface-immobilized nAg diminishes over time and becomes less effective in suppressing biofilm formation of Gram-positive bacteria, such as S. aureus. This advocates the coating, more as a protection against perioperative and early postoperative infections, and less as a long-term preventive solution.
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Affiliation(s)
- Andri K Riau
- Tissue Engineering and Stem Cell Group, Singapore Eye Research Institute, Singapore 169856, Singapore.
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore.
| | - Thet T Aung
- Anti-Infectives Research Group, Singapore Eye Research Institute, Singapore 169856, Singapore.
| | - Melina Setiawan
- Tissue Engineering and Stem Cell Group, Singapore Eye Research Institute, Singapore 169856, Singapore.
| | - Liang Yang
- School of Medicine, Southern University of Science and Technology, Shenzhen 518055, China
| | - Gary H F Yam
- Tissue Engineering and Stem Cell Group, Singapore Eye Research Institute, Singapore 169856, Singapore.
- Ophthalmology and Visual Sciences ACP, Duke-National University of Singapore Medical School, Singapore 169857, Singapore.
| | - Roger W Beuerman
- Anti-Infectives Research Group, Singapore Eye Research Institute, Singapore 169856, Singapore.
- Ophthalmology and Visual Sciences ACP, Duke-National University of Singapore Medical School, Singapore 169857, Singapore.
- SRP Neuroscience and Emerging Infectious Disease, Duke-National University of Singapore Medical School, Singapore 169857, Singapore.
| | - Subbu S Venkatraman
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Jodhbir S Mehta
- Tissue Engineering and Stem Cell Group, Singapore Eye Research Institute, Singapore 169856, Singapore.
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore.
- Ophthalmology and Visual Sciences ACP, Duke-National University of Singapore Medical School, Singapore 169857, Singapore.
- Corneal and External Eye Disease Service, Singapore National Eye Centre, Singapore 168751, Singapore.
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23
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Chen K, Fan X, Tang K, Wan G, He X, Li X, Chen Q, Shen M, Lv Y, Wang F. Morphology-Controllable Collagen/Poly(2-hydroxyethyl methacrylate) Porous Hydrogel with a Paraffin Microsphere as a Template. ACS APPLIED BIO MATERIALS 2018; 1:1311-1318. [PMID: 34996235 DOI: 10.1021/acsabm.8b00264] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
In this study, a porous poly(2-hydroxyethyl methacrylate) (PHEMA) matrix was fabricated by a paraffin template method, which was used as a substrate to adhere collagen fibers to form an interconnective porous collagen/PHEMA (Col-PHEMA) composite hydrogel. A microscope and scanning electron microscope (SEM) were employed to characterize the morphology of paraffin microspheres and Col-PHEMA composite hydrogels. The paraffin microspheres with the diameter in the range from 100 to 200 μm were collected by a preset sieve. Then, the interface of uniform paraffin microspheres were thermally bonded to form a contacted template, and the derived Col-PHEMA composite hydrogels had an interconnective porous microstructure. Fourier transform infrared spectroscopy (FTIR) indicated that new hydrogen bonds were formed between collagen fibers and the PHEMA hydrogel. Besides, the Col-PHEMA composite hydrogels revealed a high hydrophilicity, good mechanical properties, and good water uptake capacity. The porous Col-PHEMA composite hydrogels showed a good biocompatibility, and the collagen layer may promote the proliferation of fibroblast cells. The Col-PHEMA composite hydrogel is expected to find an application in corneal repairing.
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Affiliation(s)
- Keke Chen
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Xialian Fan
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Keyong Tang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Guangming Wan
- The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Xichan He
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Xiumin Li
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Qiyuan Chen
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Min Shen
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Yiwen Lv
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Fang Wang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
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24
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Poly(vinylidene fluoride)/Plasma-Treated BaTiO3 Nanocomposites with Enhanced Electroactive Phase. Macromol Res 2018. [DOI: 10.1007/s13233-018-6118-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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25
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Trinh QH, Hossain MM, Kim SH, Mok YS. Tailoring the wettability of glass using a double-dielectric barrier discharge reactor. Heliyon 2018; 4:e00522. [PMID: 29560436 PMCID: PMC5857614 DOI: 10.1016/j.heliyon.2018.e00522] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Revised: 12/02/2017] [Accepted: 01/17/2018] [Indexed: 11/06/2022] Open
Abstract
A double dielectric barrier discharge reactor operated at a low power frequency of 400 Hz and atmospheric pressure was utilized for regulating the wettability of glass surface. The hydrophobic treatment was performed by plasma polymerization of tetramethylsilane (TMS, in argon gas). The obtained results showed that the TMS coatings formed on the glass substrates without oxygen addition were smooth, uniform films with the maximum water contact angle (WCA) of about 106°, which were similar to those obtained by low pressure, high power frequency plasmas reported in the literature. The addition of oxygen into TMS/Ar plasma gas decreased the WCA and induced the formation of SiOSi and/or SiOC linkages, which dominated the existence of Si(CH2)nSi network formed in TMS/Ar (without oxygen) plasma.
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Affiliation(s)
- Quang Hung Trinh
- Department of Chemical and Biological Engineering, Jeju National University, Jeju 690-756, Republic of Korea
| | - Md Mokter Hossain
- Department of Chemical and Biological Engineering, Jeju National University, Jeju 690-756, Republic of Korea
| | - Seong H Kim
- Department of Chemical Engineering, Pennsylvania State University, University Park, PA 16802, USA
| | - Young Sun Mok
- Department of Chemical and Biological Engineering, Jeju National University, Jeju 690-756, Republic of Korea
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Lim WS, Chen K, Chong TW, Xiong GM, Birch WR, Pan J, Lee BH, Er PS, Salvekar AV, Venkatraman SS, Huang Y. A bilayer swellable drug-eluting ureteric stent: Localized drug delivery to treat urothelial diseases. Biomaterials 2018; 165:25-38. [PMID: 29501967 DOI: 10.1016/j.biomaterials.2018.02.035] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Revised: 02/14/2018] [Accepted: 02/18/2018] [Indexed: 10/18/2022]
Abstract
A bilayer swellable drug-eluting ureteric stent (BSDEUS) is engineered and implemented, as a sustained drug delivery platform technology that enhances localized drug delivery to the highly impermeable urothelium, for the treatment of urothelial diseases such as strictures and carcinomas. On deployment, the device swells to co-apt with the ureteric wall and ensure drug availability to these tissues. BSDEUS consists of a stent spray-coated with a polymeric drug containing polylactic acid-co-caprolactone (PLC) layer which is overlaid by a swellable polyethylene glycol diacrylate (PEGDA) based hydrogel. In-vitro quantification of released drug demonstrated a tunable time-profile, indicating sustained delivery over 1-month. The PEGDA hydrogel overlayer enhanced drug release and transport into explanted porcine ureteric tissues ex-vivo, under a simulated dynamic fluid flow. A preliminary pilot in-vivo feasibility study, in a porcine model, demonstrated that the swollen hydrogel co-apts with the urothelium and thus enables localized drug delivery to the target tissue section. Kidney functions remained unaffected and device did not result in either hydronephrosis or systemic toxicity. This successful engineering of a bilayer coated stent prototype, demonstrates its feasibility, thus offering a unique solution for drug-based urological therapy.
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Affiliation(s)
- Wei Shan Lim
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore; Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way Innovis, Singapore, 138634, Singapore; Sino-Singapore International Joint Research Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
| | - Kenneth Chen
- Department of Urology, Singapore General Hospital, 20 College Road, Singapore, 169856, Singapore.
| | - Tsung Wen Chong
- Department of Urology, Singapore General Hospital, 20 College Road, Singapore, 169856, Singapore
| | - Gordon Minru Xiong
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - William R Birch
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way Innovis, Singapore, 138634, Singapore
| | - Jisheng Pan
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way Innovis, Singapore, 138634, Singapore
| | - Bae Hoon Lee
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore; School of Biomedical Engineering, School of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China; Wenzhou Institute of Biomaterials and Engineering, CNITECH, CAS, Wenzhou, 325001, China
| | - Pei Shan Er
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Abhijit Vijay Salvekar
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Subbu S Venkatraman
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore; Sino-Singapore International Joint Research Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
| | - Yingying Huang
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore; Sino-Singapore International Joint Research Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
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Surface Modifications of the PMMA Optic of a Keratoprosthesis to Improve Biointegration. Cornea 2018; 36 Suppl 1:S15-S25. [PMID: 28968294 DOI: 10.1097/ico.0000000000001352] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Biointegration of a keratoprosthesis (KPro) is critical for the mitigation of various long-term postoperative complications. Biointegration of a KPro occurs between the haptic skirt (corneal graft) and the central optic [poly(methyl methacrylate) (PMMA)]. Various studies have highlighted common problems associated with poor bonding and biointegration between these 2 incompatible biomaterials. Resolution of these issues could be achieved by surface modification of the inert material (PMMA). A calcium phosphate (CaP) coating deposited on dopamine-activated PMMA sheets by simulated body fluid incubation (d-CaP coating) was shown to improve adhesion to collagen type I (main component of corneal stroma) compared with untreated PMMA and PMMA with other surface modifications. However, the d-CaP coating could easily undergo delamination, thereby reducing its potential for modification of KPro optical cylinders. In addition, the coating did not resemble the Ca and P composition of hydroxyapatite (HAp). A novel dip-coating method that involves the creation of cavities to trap and immobilize HAp nanoparticles on the PMMA surface was introduced to address the problems associated with the d-CaP coating. The newly obtained coating offered high hydrophilicity, resistance to delamination, and preservation of the Ca and P composition of HAp. These advantages resulted in improved adhesion strength by more than 1 order of magnitude compared with untreated PMMA. With respect to biointegration, human corneal stromal fibroblasts were able to adhere strongly and proliferate on HAp-coated PMMA. Furthermore, the new coating technique could be extended to immobilization of HAp nanoparticles on 3-mm-diameter PMMA cylinders, bringing it closer to clinical application.
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Bazard P, Frisina RD, Walton JP, Bhethanabotla VR. Nanoparticle-based Plasmonic Transduction for Modulation of Electrically Excitable Cells. Sci Rep 2017; 7:7803. [PMID: 28798342 PMCID: PMC5552804 DOI: 10.1038/s41598-017-08141-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Accepted: 07/05/2017] [Indexed: 11/11/2022] Open
Abstract
There is a compelling need for the development of new sensory and neural prosthetic devices which are capable of more precise point stimulation. Current prosthetic devices suffer from the limitation of low spatial resolution due to the non-specific stimulation characteristics of electrical stimulation, i.e., the spread of electric fields generated. We present a visible light stimulation method for modulating the firing patterns of electrically-excitable cells using surface plasmon resonance phenomena. In in-vitro studies using gold (Au) nanoparticle-coated nanoelectrodes, we show that this method (substrate coated with nanoparticles) has the potential for incorporating this new technology into neural stimulation prosthetics, such as cochlear implants for the deaf, with very high spatial resolution. Au nanoparticles (NPs) were coated on micropipettes using aminosilane linkers; and these micropipettes were used for stimulating and inhibiting the action potential firing patterns of SH-SY5Y human neuroblastoma cells and neonatal cardiomyocytes. Our findings pave the way for development of biomedical implants and neural testing devices using nanoelectrodes capable of temporally and spatially precise excitation and inhibition of electrically-excitable cellular activity.
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Affiliation(s)
- Parveen Bazard
- Department of Chemical and Biomedical Engineering, College of Engineering, University of South Florida, Tampa, FL-33620, USA.,Global Center of Hearing and Speech Research, University of South Florida, Tampa, FL-33612, USA
| | - Robert D Frisina
- Department of Chemical and Biomedical Engineering, College of Engineering, University of South Florida, Tampa, FL-33620, USA.,Department of Communication Sciences and Disorders, College of Behavioral & Community Sciences, University of South Florida, Tampa, FL-33620, USA.,Global Center of Hearing and Speech Research, University of South Florida, Tampa, FL-33612, USA
| | - Joseph P Walton
- Department of Chemical and Biomedical Engineering, College of Engineering, University of South Florida, Tampa, FL-33620, USA.,Department of Communication Sciences and Disorders, College of Behavioral & Community Sciences, University of South Florida, Tampa, FL-33620, USA.,Global Center of Hearing and Speech Research, University of South Florida, Tampa, FL-33612, USA
| | - Venkat R Bhethanabotla
- Department of Chemical and Biomedical Engineering, College of Engineering, University of South Florida, Tampa, FL-33620, USA. .,Global Center of Hearing and Speech Research, University of South Florida, Tampa, FL-33612, USA.
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Golubevas R, Zarkov A, Alinauskas L, Stankeviciute Z, Balciunas G, Garskaite E, Kareiva A. Fabrication and investigation of high-quality glass-ceramic (GC)–polymethyl methacrylate (PMMA) composite for regenerative medicine. RSC Adv 2017. [DOI: 10.1039/c7ra05188c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Investigations of mechanical and dissolution properties show glass ceramic–PMMA composite potential for regenerative medicine when extreme strength is not required.
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Affiliation(s)
| | - Aleksej Zarkov
- Institute of Chemistry
- Vilnius University
- Vilnius LT-03225
- Lithuania
| | | | | | - Giedrius Balciunas
- Scientific Institute of Thermal Insulation
- Vilnius Gediminas Technical University
- Lithuania
| | - Edita Garskaite
- Institute of Chemistry
- Vilnius University
- Vilnius LT-03225
- Lithuania
| | - Aivaras Kareiva
- Institute of Chemistry
- Vilnius University
- Vilnius LT-03225
- Lithuania
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30
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Riau AK, Mondal D, Setiawan M, Palaniappan A, Yam GHF, Liedberg B, Venkatraman SS, Mehta JS. Functionalization of the Polymeric Surface with Bioceramic Nanoparticles via a Novel, Nonthermal Dip Coating Method. ACS APPLIED MATERIALS & INTERFACES 2016; 8:35565-35577. [PMID: 27966877 DOI: 10.1021/acsami.6b12371] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The only nonthermal method of depositing a bioceramic-based coating on polymeric substrates is by incubation in liquid, e.g., simulated body fluid to form an apatite-like layer. The drawbacks of this method include the long processing time, the production of low scratch resistant coating, and an end product that does not resemble the intended bioceramic composition. Techniques, such as plasma spraying and magnetron sputtering, involving high processing temperature are unsuitable for polymers, e.g., PMMA. Here, we introduce a nonthermal coating method to immobilize hydroxyapatite (HAp) and TiO2 nanoparticles on PMMA via a simple and fast dip coating method. Cavities that formed on the PMMA, induced by chloroform, appeared to trap the nanoparticles which accumulated to form layers of bioceramic coating only after 60 s. The resulting coating was hydrophilic and highly resistant to delamination. In the context of our research and to address the current clinical need, we demonstrate that the HAp-coated PMMA, which is intended to be used as a visual optic of a corneal prosthetic device, improves its bonding and biointegration with collagen, the main component of a corneal stroma. The HAp-coated PMMA resulted in better adhesion with the collagen than untreated PMMA in artificial tear fluid over 28 days. Human corneal stromal fibroblasts showed better attachment, viability, and proliferation rate on the HAp-coated PMMA than on untreated PMMA. This coating method is an innovative solution to immobilize various bioceramic nanoparticles on polymers and may be used in other biomedical implants.
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Affiliation(s)
- Andri K Riau
- School of Materials Science and Engineering, Nanyang Technological University , Singapore 639798, Singapore
- Tissue Engineering and Stem Cell Group, Singapore Eye Research Institute , Singapore 169856, Singapore
| | - Debasish Mondal
- School of Materials Science and Engineering, Nanyang Technological University , Singapore 639798, Singapore
| | - Melina Setiawan
- Tissue Engineering and Stem Cell Group, Singapore Eye Research Institute , Singapore 169856, Singapore
| | - Alagappan Palaniappan
- Center for Biomimetic Sensor Science, Nanyang Technological University , Singapore 637553, Singapore
| | - Gary H F Yam
- Tissue Engineering and Stem Cell Group, Singapore Eye Research Institute , Singapore 169856, Singapore
| | - Bo Liedberg
- School of Materials Science and Engineering, Nanyang Technological University , Singapore 639798, Singapore
- Center for Biomimetic Sensor Science, Nanyang Technological University , Singapore 637553, Singapore
| | - Subbu S Venkatraman
- School of Materials Science and Engineering, Nanyang Technological University , Singapore 639798, Singapore
| | - Jodhbir S Mehta
- School of Materials Science and Engineering, Nanyang Technological University , Singapore 639798, Singapore
- Tissue Engineering and Stem Cell Group, Singapore Eye Research Institute , Singapore 169856, Singapore
- Singapore National Eye Center , Singapore 168751, Singapore
- Department of Clinical Sciences, Duke-NUS Graduate Medical School , Singapore 169857, Singapore
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Fabrication of Polymerase Chain Reaction Plastic Lab-on-a-Chip Device for Rapid Molecular Diagnoses. Int Neurourol J 2016; 20:S38-48. [PMID: 27230459 PMCID: PMC4895911 DOI: 10.5213/inj.1632602.301] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Accepted: 04/29/2016] [Indexed: 11/17/2022] Open
Abstract
Purpose: We aim to fabricate a thermoplastic poly(methylmethacrylate) (PMMA) Lab-on-a-Chip device to perform continuous- flow polymerase chain reactions (PCRs) for rapid molecular detection of foodborne pathogen bacteria. Methods: A miniaturized plastic device was fabricated by utilizing PMMA substrates mediated by poly(dimethylsiloxane) interfacial coating, enabling bonding under mild conditions, and thus avoiding the deformation or collapse of microchannels. Surface characterizations were carried out and bond strength was measured. The feasibility of the Lab-on-a-Chip device for performing on-chip PCR utilizing a lab-made, portable dual heater was evaluated. The results were compared with those obtained using a commercially available thermal cycler. Results: A PMMA Lab-on-a-Chip device was designed and fabricated for conducting PCR using foodborne pathogens as sample targets. A robust bond was established between the PMMA substrates, which is essential for performing miniaturized PCR on plastic. The feasibility of on-chip PCR was evaluated using Escherichia coli O157:H7 and Cronobacter condimenti, two worldwide foodborne pathogens, and the target amplicons were successfully amplified within 25 minutes. Conclusions: In this study, we present a novel design of a low-cost and high-throughput thermoplastic PMMA Lab-on-a-Chip device for conducting microscale PCR, and we enable rapid molecular diagnoses of two important foodborne pathogens in minute resolution using this device. In this regard, the introduced highly portable system design has the potential to enable PCR investigations of many diseases quickly and accurately.
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