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Valagiannopoulos C, Tosi D. Scattering integral equation formulation for intravascular inclusion biosensing. Sci Rep 2024; 14:14978. [PMID: 38951563 PMCID: PMC11217448 DOI: 10.1038/s41598-024-64633-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2024] [Accepted: 06/11/2024] [Indexed: 07/03/2024] Open
Abstract
A dielectric waveguide, inserted into blood vessels, supports its basic mode that is being scattered by a near-field intravascular inclusion. A rigorous integral equation formulation is performed and the electromagnetic response from that inhomogeneity is semi-analytically evaluated. The detectability of the formation, based on spatial distribution of the recorded signal, is estimated by considering various inclusion sizes, locations and textural contrasts. The proposed technique, with its variants and generalizations, provides a generic versatile toolbox to efficiently model biosensor layouts involved in healthcare monitoring and disease screening.
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Affiliation(s)
| | - Daniele Tosi
- School of Engineering and Digital Sciences, Nazarbayev University, Astana, 010000, Kazakhstan.
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2
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Characterizing the Mechanical Performance of a Bare-Metal Stent with an Auxetic Cell Geometry. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12020910] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
This study develops and characterizes the distinctive mechanical features of a stainless-steel metal stent with a tailored structure. A high-precision femtosecond laser was used to micromachine a stent with re-entrant hexagonal (auxetic) cell geometry. We then characterized its mechanical behavior under various mechanical loadings using in vitro experiments and through finite element analysis. The stent properties, such as the higher capability of the stent to bear upon bending, exceptional advantage at elevated levels of twisting angles, and proper buckling, all ensured a preserved opening to maintain the blood flow. The outcomes of this preliminary study present a potential design for a stent with improved physiologically relevant mechanical conditions such as longitudinal contraction, radial strength, and migration of the stent.
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Matsuzaki Y, Wiet MG, Boe BA, Shinoka T. The Real Need for Regenerative Medicine in the Future of Congenital Heart Disease Treatment. Biomedicines 2021; 9:478. [PMID: 33925558 PMCID: PMC8145070 DOI: 10.3390/biomedicines9050478] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 04/19/2021] [Accepted: 04/24/2021] [Indexed: 11/23/2022] Open
Abstract
Bioabsorbable materials made from polymeric compounds have been used in many fields of regenerative medicine to promote tissue regeneration. These materials replace autologous tissue and, due to their growth potential, make excellent substitutes for cardiovascular applications in the treatment of congenital heart disease. However, there remains a sizable gap between their theoretical advantages and actual clinical application within pediatric cardiovascular surgery. This review will focus on four areas of regenerative medicine in which bioabsorbable materials have the potential to alleviate the burden where current treatment options have been unable to within the field of pediatric cardiovascular surgery. These four areas include tissue-engineered pulmonary valves, tissue-engineered patches, regenerative medicine options for treatment of pulmonary vein stenosis and tissue-engineered vascular grafts. We will discuss the research and development of biocompatible materials reported to date, the evaluation of materials in vitro, and the results of studies that have progressed to clinical trials.
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Affiliation(s)
- Yuichi Matsuzaki
- Center for Regenerative Medicine, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, 700 Children’s Drive, T2294, Columbus, OH 43205, USA; (Y.M.); (M.G.W.)
| | - Matthew G. Wiet
- Center for Regenerative Medicine, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, 700 Children’s Drive, T2294, Columbus, OH 43205, USA; (Y.M.); (M.G.W.)
| | - Brian A. Boe
- Department of Cardiology, The Heart Center, Nationwide Children’s Hospital, 700 Children’s Drive, T2294, Columbus, OH 43205, USA;
| | - Toshiharu Shinoka
- Center for Regenerative Medicine, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, 700 Children’s Drive, T2294, Columbus, OH 43205, USA; (Y.M.); (M.G.W.)
- Department of Cardiothoracic Surgery, The Heart Center, Nationwide Children’s Hospital, 700 Children’s Drive, T2294, Columbus, OH 43205, USA
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4
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Wang J, Wang Y, Zhao Y, Zhao J, Zhang B, Xu K. EGCG Regulates Cell Apoptosis of Human Umbilical Vein Endothelial Cells Grown on 316L Stainless Steel for Stent Implantation. DRUG DESIGN DEVELOPMENT AND THERAPY 2021; 15:493-499. [PMID: 33603339 PMCID: PMC7886104 DOI: 10.2147/dddt.s296548] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Accepted: 01/21/2021] [Indexed: 11/23/2022]
Abstract
Background Nowadays, medical grade 316L stainless steel (316L SS) is being widely used for intravascular stents, and the drug-eluting stent (DES) system is able to significantly reduce the occurrences of in-stent restenosis. But the drugs and the polymer coating used in DES potentially induce the forming of late stent thrombosis. In order to reduce the occurrence of ISR after stent implantation, the development of novel drugs for DESs is urgently needed. Methods This study aimed to investigate the potential mechanisms of epigallocatechin-3-gallate (EGCG) on human umbilical vein endothelial cells (HUVEC) grown on 316L stainless steel (316L SS) using flow cytometry and Q-PCR methods. Results Our results showed that EGCG (12.5, 25, 50, 100 μmol/L) significantly inhibited HUVEC proliferation. Flow cytometry analysis indicated that EGCG (25, 50, 100 μmol/L) induced apoptosis. Moreover, qRT-PCRrevealed that genes associated with cell apoptosis (caspase-3, 8, 9, Fas) and autophagy (Atg 5, Atg 7, Atg 12) were up-regulated after EGCG treatment. Conclusion These findings indicate that EGCG possesses chemo preventive potential in stent coating which may serve as a novel new drug for stent implantation.
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Affiliation(s)
- Jinpeng Wang
- Department of Cardiology, The Second Hospital of Jilin University, Changchun, 130041, People's Republic of China
| | - Yue Wang
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, People's Republic of China
| | - Yuyi Zhao
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, People's Republic of China
| | - Jinbin Zhao
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, People's Republic of China
| | - Beilin Zhang
- Department of Physiology, College of Basic Medical Sciences, Jilin University, Changchun, 130021, People's Republic of China
| | - Kun Xu
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, People's Republic of China.,Jilin Engineering Research Center of Public Health Detection, Changchun, 130021, People's Republic of China
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5
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Pickard R, Goulao B, Carnell S, Shen J, MacLennan G, Norrie J, Breckons M, Vale L, Whybrow P, Rapley T, Forbes R, Currer S, Forrest M, Wilkinson J, McColl E, Andrich D, Barclay S, Cook J, Mundy A, N'Dow J, Payne S, Watkin N. Open urethroplasty versus endoscopic urethrotomy for recurrent urethral stricture in men: the OPEN RCT. Health Technol Assess 2020; 24:1-110. [PMID: 33228846 PMCID: PMC7750862 DOI: 10.3310/hta24610] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Men who suffer recurrence of bulbar urethral stricture have to decide between endoscopic urethrotomy and open urethroplasty to manage their urinary symptoms. Evidence of relative clinical effectiveness and cost-effectiveness is lacking. OBJECTIVES To assess benefit, harms and cost-effectiveness of open urethroplasty compared with endoscopic urethrotomy as treatment for recurrent urethral stricture in men. DESIGN Parallel-group, open-label, patient-randomised trial of allocated intervention with 6-monthly follow-ups over 24 months. Target sample size was 210 participants providing outcome data. Participants, clinicians and local research staff could not be blinded to allocation. Central trial staff were blinded when needed. SETTING UK NHS with recruitment from 38 hospital sites. PARTICIPANTS A total of 222 men requiring operative treatment for recurrence of bulbar urethral stricture who had received at least one previous intervention for stricture. INTERVENTIONS A centralised randomisation system using random blocks allocated participants 1 : 1 to open urethroplasty (experimental group) or endoscopic urethrotomy (control group). MAIN OUTCOME MEASURES The primary clinical outcome was control of urinary symptoms. Cost-effectiveness was assessed by cost per quality-adjusted life-year (QALY) gained over 24 months. The main secondary outcome was the need for reintervention for stricture recurrence. RESULTS The mean difference in the area under the curve of repeated measurement of voiding symptoms scored from 0 (no symptoms) to 24 (severe symptoms) between the two groups was -0.36 [95% confidence interval (CI) -1.78 to 1.02; p = 0.6]. Mean voiding symptom scores improved between baseline and 24 months after randomisation from 13.4 [standard deviation (SD) 4.5] to 6 (SD 5.5) for urethroplasty group and from 13.2 (SD 4.7) to 6.4 (SD 5.3) for urethrotomy. Reintervention was less frequent and occurred earlier in the urethroplasty group (hazard ratio 0.52, 95% CI 0.31 to 0.89; p = 0.02). There were two postoperative complications requiring reinterventions in the group that received urethroplasty and five, including one death from pulmonary embolism, in the group that received urethrotomy. Over 24 months, urethroplasty cost on average more than urethrotomy (cost difference £2148, 95% CI £689 to £3606) and resulted in a similar number of QALYs (QALY difference -0.01, 95% CI -0.17 to 0.14). Therefore, based on current evidence, urethrotomy is considered to be cost-effective. LIMITATIONS We were able to include only 69 (63%) of the 109 men allocated to urethroplasty and 90 (80%) of the 113 men allocated to urethrotomy in the primary complete-case intention-to-treat analysis. CONCLUSIONS The similar magnitude of symptom improvement seen for the two procedures over 24 months of follow-up shows that both provide effective symptom control. The lower likelihood of further intervention favours urethroplasty, but this had a higher cost over the 24 months of follow-up and was unlikely to be considered cost-effective. FUTURE WORK Formulate methods to incorporate short-term disutility data into cost-effectiveness analysis. Survey pathways of care for men with urethral stricture, including the use of enhanced recovery after urethroplasty. Establish a pragmatic follow-up schedule to allow national audit of outcomes following urethral surgery with linkage to NHS Hospital Episode Statistics. TRIAL REGISTRATION Current Controlled Trials ISRCTN98009168. FUNDING This project was funded by the NIHR Health Technology Assessment programme and will be published in full in Health Technology Assessment; Vol. 24, No. 61. See the NIHR Journals Library website for further project information.
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Affiliation(s)
- Robert Pickard
- Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, UK
| | - Beatriz Goulao
- Health Services Research Unit, University of Aberdeen, Aberdeen, UK
| | - Sonya Carnell
- Newcastle Clinical Trials Unit, Newcastle University, Newcastle upon Tyne, UK
| | - Jing Shen
- Institute of Health & Society, Newcastle University, Newcastle upon Tyne, UK
| | - Graeme MacLennan
- Centre for Healthcare and Randomised Trials, University of Aberdeen, Aberdeen, UK
| | - John Norrie
- Usher Institute, University of Edinburgh, Edinburgh, UK
| | - Matt Breckons
- Institute of Health & Society, Newcastle University, Newcastle upon Tyne, UK
| | - Luke Vale
- Institute of Health & Society, Newcastle University, Newcastle upon Tyne, UK
| | | | - Tim Rapley
- Social Work, Education & Community Wellbeing, University of Northumbria, Newcastle upon Tyne, UK
| | - Rebecca Forbes
- Newcastle Clinical Trials Unit, Newcastle University, Newcastle upon Tyne, UK
| | - Stephanie Currer
- Newcastle Clinical Trials Unit, Newcastle University, Newcastle upon Tyne, UK
| | - Mark Forrest
- Centre for Healthcare and Randomised Trials, University of Aberdeen, Aberdeen, UK
| | - Jennifer Wilkinson
- Newcastle Clinical Trials Unit, Newcastle University, Newcastle upon Tyne, UK
| | - Elaine McColl
- Institute of Health & Society, Newcastle University, Newcastle upon Tyne, UK
| | - Daniela Andrich
- University College London Hospitals NHS Foundation Trust, London, UK
| | | | - Jonathan Cook
- Oxford Clinical Trials Research Unit, Oxford University, Oxford, UK
| | - Anthony Mundy
- University College London Hospitals NHS Foundation Trust, London, UK
| | - James N'Dow
- Academic Urology Unit, University of Aberdeen, Aberdeen, UK
| | - Stephen Payne
- Central Manchester Hospitals NHS Foundation Trust, Manchester, UK
| | - Nick Watkin
- St George's University Hospitals NHS Foundation Trust, London, UK
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6
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Yang W, Guan D, Liu J, Luo Y, Wang Y. Synthesis and characterization of biodegradable linear shape memory polyurethanes with high mechanical performance by incorporating novel long chain diisocyanates. NEW J CHEM 2020. [DOI: 10.1039/c9nj06017k] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Novel long chain diisocyanates were developed for synthesis of biodegradable linear shape memory polyurethanes demonstrating high mechanical performance.
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Affiliation(s)
- Wei Yang
- Lab for Smart & Bioinspired Materials
- College of Bioengineering
- Chongqing University
- Chongqing 400030
- China
| | - Di Guan
- Lab for Smart & Bioinspired Materials
- College of Bioengineering
- Chongqing University
- Chongqing 400030
- China
| | - Juan Liu
- Lab for Smart & Bioinspired Materials
- College of Bioengineering
- Chongqing University
- Chongqing 400030
- China
| | - Yanfeng Luo
- Lab for Smart & Bioinspired Materials
- College of Bioengineering
- Chongqing University
- Chongqing 400030
- China
| | - Yuanliang Wang
- Lab for Smart & Bioinspired Materials
- College of Bioengineering
- Chongqing University
- Chongqing 400030
- China
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Baskaran R, Ko UJ, Davaa E, Park JE, Jiang Y, Lee J, Yang SG. Doxycycline-Eluting Core-Shell Type Nanofiber-Covered Trachea Stent for Inhibition of Cellular Metalloproteinase and Its Related Fibrotic Stenosis. Pharmaceutics 2019; 11:pharmaceutics11080421. [PMID: 31430987 PMCID: PMC6723391 DOI: 10.3390/pharmaceutics11080421] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2019] [Revised: 08/04/2019] [Accepted: 08/14/2019] [Indexed: 12/13/2022] Open
Abstract
In this study, we fabricated a doxycycline (doxy)-eluting nanofiber-covered endotracheal stent for the prevention of stent intubation-related tissue fibrosis and re-stenosis. The nanofiber was deposited directly on the outer surface of the stent using a coaxial electrospinning method to form a doxy-eluting cover sleeve. Poly(d,l-lactide) was used as the shell-forming polymer and dedicated drug release-control membrane. Polyurethane was selected as the drug-loading core polymer. The compositional ratio of the core to shell was adjusted to 1:0, 1:2, and 1:4 by changing the electro-spray rate of each polymeric solution and microscopic observation of nanofibers using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and the fluorescence microscopy proved core-shell structure of nanofibers. The in vitro release study suggested that the release of doxy could be controlled by increasing the compositional ratio of the shell. The growth of HT1080 fibrosarcoma cells was inhibited by the 10% doxy-containing nanofiber. The real-time polymerase chain reaction (PCR) in HT1080 cells and xenografted tissue models indicated that the doxy-releasing nanofiber inhibited mRNA expression of metalloproteinases (MT1-MMP, MMP-2, and MMP-9). Overall, our study demonstrates that a doxy-eluting core-shell nanofiber stent can be successfully fabricated using coaxial electrospinning and displays the potential to prevent fibrotic re-stenosis, which is the most problematic clinical complication of tracheal stent intubation.
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Affiliation(s)
- Rengarajan Baskaran
- Department of Biomedical Science, Inha University College of Medicine, Incheon 22332, Korea
| | - Un-Jeong Ko
- Department of Biomedical Science, Inha University College of Medicine, Incheon 22332, Korea
| | - Enkhzaya Davaa
- Department of Biomedical Science, Inha University College of Medicine, Incheon 22332, Korea
| | - Ji Eun Park
- Department of Biomedical Science, Inha University College of Medicine, Incheon 22332, Korea
- Inha Institute of Aerospace Medicine, Inha University College of Medicine, Incheon 22332, Korea
| | - Yixin Jiang
- Department of Biomedical Science, Inha University College of Medicine, Incheon 22332, Korea
- Inha Institute of Aerospace Medicine, Inha University College of Medicine, Incheon 22332, Korea
| | - Junghan Lee
- Department of Biomedical Science, Inha University College of Medicine, Incheon 22332, Korea
- Inha Institute of Aerospace Medicine, Inha University College of Medicine, Incheon 22332, Korea
| | - Su-Geun Yang
- Department of Biomedical Science, Inha University College of Medicine, Incheon 22332, Korea.
- Inha Institute of Aerospace Medicine, Inha University College of Medicine, Incheon 22332, Korea.
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8
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Arafat M, Fouladian P, Blencowe A, Albrecht H, Song Y, Garg S. Drug-eluting non-vascular stents for localised drug targeting in obstructive gastrointestinal cancers. J Control Release 2019; 308:209-231. [DOI: 10.1016/j.jconrel.2019.07.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 07/02/2019] [Accepted: 07/03/2019] [Indexed: 02/08/2023]
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9
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Wu K, Liu J, lei L, Shen Y, Guo S. A stent film of paclitaxel presenting extreme accumulation of paclitaxel in tumor tissue and excellent antitumor efficacy after implantation beneath the subcutaneous tumor xenograft in mice. Int J Pharm 2018; 553:29-36. [DOI: 10.1016/j.ijpharm.2018.09.060] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 09/12/2018] [Accepted: 09/25/2018] [Indexed: 02/07/2023]
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10
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Biodegradable stents for coronary artery disease treatment: Recent advances and future perspectives. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2018; 91:163-178. [DOI: 10.1016/j.msec.2018.04.100] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2017] [Revised: 04/11/2018] [Accepted: 04/28/2018] [Indexed: 12/24/2022]
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Ghasemi A, Hashemi B. Co-existence effect of tricalcium phosphate and bioactive glass on biological and biodegradation characteristic of Poly L-Lactic Acid (PLLA) in trinary composite scaffold form. Biomed Mater Eng 2018; 28:655-669. [PMID: 29171974 DOI: 10.3233/bme-171707] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The purpose of this study is to analyze the co-existence effect of 30 wt.% TCP-BG phases on degradation and precipitation behaviors of PLLA based composite scaffold in biological media. First, phase separation method was used to synthesize of the pure PLLA and the trinary composite scaffolds, and second they were immersed in SBF solution for 45 days. Subsequently, the degradation and precipitation characteristic were investigated by analyzing of pH value and weight changes of the immersed samples, the ability of biological products formation and the change of relative molecular weight of PLLA matrix as function of the degradation time. Finally, the experimental data of relative molecular weight change were verified by Han and Pan model and comparisons were made between them. Results have represented precipitation of huge amount of carbonate apatite on surface of the composite scaffold, and also the acidity of SBF media changes moderately which is prove better bioactivity properties compare to the pure PLLA scaffold. The results of comparison with the model point to quiet good agreement between them in early stage of degradation. So, the consequences suggest that the TCP-BG/PLLA composite scaffold have great potential to be applied in bone replacements or repairs.
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Affiliation(s)
- Abbas Ghasemi
- Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, Iran
| | - Babak Hashemi
- Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, Iran
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12
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Bakola V, Karagkiozaki V, Tsiapla AR, Pappa F, Moutsios I, Pavlidou E, Logothetidis S. Dipyridamole-loaded biodegradable PLA nanoplatforms as coatings for cardiovascular stents. NANOTECHNOLOGY 2018; 29:275101. [PMID: 29629708 DOI: 10.1088/1361-6528/aabc69] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Cardiovascular stents are commonly used for the treatment of cardiovascular diseases that in developed societies are the most frequent causes of mortality and morbidity. In recent years, thorough research and development of drug-eluting stents has been done, with emphasis on coronary stenting to avoid the most common complication, in-stent thrombosis. Dipyridamole (DPM) is a medication that inhibits blood clot formation. Drug delivery nanoplatforms consisting of biodegradable polymers can be fabricated via electrospinning deposition, known for its cost-effective and versatile advantages, that produces fibrous scaffolds that are able to sustain and control drug release. A novel drug delivery nanosystem of polylactic acid fibrous scaffold loaded with the anti-platelet drug DPM was fabricated by electrospinning as coating for cardiovascular stents. The surface morphology and topography that were evaluated via atomic force microscopy, scanning electron microscopy and optical microscopy, were found to be good and suitable for tissue engineering. Contact angle measurements established the hydrophobic behavior of these fibrous nanoplatforms. Drug-release kinetics and degradation studies were conducted and revealed a sustained and controllable release of DPM, through this fibrous matrix over time. Finally, cytotoxicity studies took place to evaluate the cytocompatibility of the scaffold that confirmed its compatible behavior. The successful performance of this nanoplatform can lead to it being a valuable tool for atherosclerosis treatment.
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Affiliation(s)
- V Bakola
- Nanotechnology Lab LTFN (Lab for Thin Films-Nanobiomaterials-Nanosystems-Nanometrology) Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece. BL Nanobiomed P.C. Thessaloniki, Greece
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13
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Abstract
The human body is endowed with an uncanny ability to distinguish self from foreign. The implantation of a foreign object inside a mammalian host activates complex signaling cascades, which lead to biological encapsulation of the implant. This reaction by the host system to a foreign object is known as foreign body response (FBR). Over the last few decades, it has been increasingly important to have a deeper insight into the mechanisms of FBR is needed to develop biomaterials for better integration with living systems. In the light of recent advances in tissue engineering and regenerative medicine, particularly in the field of biosensors and biodegradable tissue engineering scaffolds, the classical concepts related to the FBR have acquired new dimensions. The aim of this review is to provide a holistic view of the FBR, while critically analyzing the challenges, which need to be addressed in the future to overcome this innate response. In particular, this review discusses the relevant experimental methodology to assess the host response. The role of erosion and degradation behavior on FBR with biodegradable polymers is largely explored. Apart from the discussion on temporal progression of FBR, an emphasis has been given to the design of next-generation biomaterials with favorable host response.
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14
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Selin V, Albright V, Ankner JF, Marin A, Andrianov AK, Sukhishvili SA. Biocompatible Nanocoatings of Fluorinated Polyphosphazenes through Aqueous Assembly. ACS APPLIED MATERIALS & INTERFACES 2018; 10:9756-9764. [PMID: 29505245 DOI: 10.1021/acsami.8b02072] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Nonionic fluorinated polyphosphazenes, such as poly[bis(trifluoroethoxy)phosphazene] (PTFEP), display superb biocompatibility, yet their deposition to surfaces has been limited to solution casting from organic solvents or thermal molding. Herein, hydrophobic coatings of fluorinated polyphosphazenes are demonstrated through controlled deposition of ionic fluorinated polyphosphazenes (iFPs) from aqueous solutions using the layer-by-layer (LbL) technique. Specifically, the assemblies included poly[(carboxylatophenoxy)(trifluoroethoxy)phosphazenes] with varied content of fluorine atoms as iFPs (or poly[bis(carboxyphenoxy)phosphazene] (PCPP) as a control nonfluorinated polyphosphazene) and a variety of polycations. Hydrophobic interactions largely contributed to the formation of LbL films of iFPs with polycations, leading to linear growth and extremely low water uptake. Hydrophobicity-enhanced ionic pairing within iFP/BPEI assemblies gave rise to large-amplitude oscillations in surface wettability as a function of capping layer, which were the largest for the most fluorinated iFP, while control PCPP/polycation systems remained hydrophilic regardless of the film top layer. Neutron reflectometry (NR) studies indicated superior layering and persistence of such layering in salt solution for iFP/BPEI films as compared to control PCPP/polycation systems. Hydrophobicity of iFP-capped LbL coatings could be further enhanced by using a highly porous polyester surgical felt rather than planar substrates for film deposition. Importantly, iFP/polycation coatings displayed biocompatibility which was similar to or superior to that of solution-cast coatings of a clinically validated material (PTFEP), as demonstrated by the hemolysis of the whole blood and protein adsorption studies.
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Affiliation(s)
- Victor Selin
- Department of Materials Science & Engineering , Texas A&M University , College Station , Texas 77843 , United States
| | - Victoria Albright
- Department of Materials Science & Engineering , Texas A&M University , College Station , Texas 77843 , United States
| | - John F Ankner
- Spallation Neutron Source , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Alexander Marin
- Institute for Bioscience and Biotechnology Research , University of Maryland , Rockville , Maryland 20850 , United States
| | - Alexander K Andrianov
- Institute for Bioscience and Biotechnology Research , University of Maryland , Rockville , Maryland 20850 , United States
| | - Svetlana A Sukhishvili
- Department of Materials Science & Engineering , Texas A&M University , College Station , Texas 77843 , United States
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15
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Cubedo J, Blasco A, Padró T, Ramaiola I, Juan-Babot O, Goicolea J, Fernández-Díaz J, Oteo J, Badimon L. Molecular signature of coronary stent thrombosis: oxidative stress and innate immunity cells. Thromb Haemost 2017. [DOI: 10.1160/th17-03-069] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
SummaryThe clinical impact of in-stent thrombosis is high because it is associated with high mortality and 20 % of the patients suffer a recurrent event within the two following years. The aim of this study was to characterise the morphologic and proteomic profile of in-stent thrombi (IST) in comparison to thrombi developed on native coronary arteries (CT) to identify a differential molecular signature. The study included 45 patients with ST-elevation-myocardial-infarction (STEMI) treated by primary-percutaneous-intervention and thrombus aspiration: 21 had IST and 24 had CT. Thrombi were characterised by morphologic immunohistochemical analysis and differential proteomic profiling (2-DE+MALDI-TOF/TOF). Bioinformatic analysis revealed differences in proteins related to oxidative-stress and cell death/survival. IST showed a higher content of structural proteins (gelsolin, actin-cytoplasmic-1, tropomyosin, and myosin) together with an imbalance in redox-homeostasis related proteins (increased superoxide-dismutase and decreased peroxiredoxin-2 thrombus content), and a coordinated increase of chaperones (HSP60 and HSC70) and cellular quality control-related proteins (26S–protease-regulatory-subunit-7). These changes were reflected into a significant decrease in HSC70 systemic levels and a significant increase in advanced-oxidation-protein-products (AOPP) indicative of increased oxidative stress-mediated protein damage in IST. Our results reveal an imbalance in redox-related proteins indicative of an exacerbated oxidative-stress that leads to an accumulation of AOPP serum levels in IST. Moreover, the coordinated increase in chaperones and regulatory proteins reflects the activation of intracellular protection mechanisms to maintain protein integrity in IST. The failure to counterbalance the stress situation could trigger cellular apoptosis leading to the destabilization of the thrombus and to a worse prognosis of IST-STEMI-patients.Supplementary Material to this article is available online at www.thrombosis-online.com.
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Recent developments in drug eluting devices with tailored interfacial properties. Adv Colloid Interface Sci 2017; 249:181-191. [PMID: 28532663 DOI: 10.1016/j.cis.2017.05.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 05/02/2017] [Accepted: 05/02/2017] [Indexed: 11/23/2022]
Abstract
Drug eluting devices have greatly evolved during past years to become fundamental products of great marketing importance in the biomedical field. There is currently a large diversity of highly specialized devices for specific applications, making the development of these devices an exciting field of research. The replacement of the former bare metal devices by devices loaded with drugs allowed the sustained and controlled release of drugs, to achieve the desired local therapeutic concentration of drug. The newer devices have been "engineered" with surfaces containing micro- and nanoscale features in a well-controlled manner, that have shown to significantly affect cellular and subcellular function of various biological systems. For example, the topography can be structured to form an antifouling surface mimicking the defense mechanisms found in nature, like the skin of the shark. In the case of bone implants, well-controlled nanostructured interfaces can promote osteoblast differentiation and matrix production, and enhance short-term and long-term osteointegration. In any case, the goal of current research is to design implants that induce controlled, guided, and rapid healing. This article reviews recent trends in the development of drug eluting devices, as well as recent developments on the micro/nanotechnology scales, and their future challenges. For this purpose medical devices have been divided according to the different systems of the body they are focused to: orthopedic devices, breathing stents, gastrointestinal and urinary systems, devices for cardiovascular diseases, neuronal implants, and wound dressings.
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17
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Improve blood compatibility of bioresorbable magnesium stents coated with functionalized anti-CD34 antibody and heparin-collagen multiplayers. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2017; 2017:2068-2071. [PMID: 29060303 DOI: 10.1109/embc.2017.8037260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Instentrestenosis and late stent thrombosis continue to be the greatest limitations of drug-eluting stents. In this study, an anti-CD34 antibody functionalized multilayer of heparin/collagen type I is developed by layer-by-layer assemble to enhance biocompatibility and recruit endothelial progenitor cells. The SEM results demonstrate that (Hep/Col)5-coated samples have a rougher surface compared to (Hep/Col)2-coated samples and untreated samples. The EDX and FTIR results both confirmed the presence of heparin and collagen onto the modified samples. The immunofluorescence staining outcomes demonstrated that anti-CD34 antibody has successfully immobilized onto modified Mg discs.
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18
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Liu H, Pan C, Zhou S, Li J, Huang N, Dong L. Improving hemocompatibility and accelerating endothelialization of vascular stents by a copper-titanium film. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 69:1175-82. [DOI: 10.1016/j.msec.2016.08.028] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 07/28/2016] [Accepted: 08/12/2016] [Indexed: 01/25/2023]
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19
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Ding W. Opportunities and challenges for the biodegradable magnesium alloys as next-generation biomaterials. Regen Biomater 2016; 3:79-86. [PMID: 27047673 PMCID: PMC4817317 DOI: 10.1093/rb/rbw003] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Accepted: 01/04/2016] [Indexed: 02/02/2023] Open
Abstract
In recent years, biodegradable magnesium alloys emerge as a new class of biomaterials for tissue engineering and medical devices. Deploying biodegradable magnesium-based materials not only avoids a second surgical intervention for implant removal but also circumvents the long-term foreign body effect of permanent implants. However, these materials are often subjected to an uncontrolled and fast degradation, acute toxic responses and rapid structural failure presumably due to a localized, too rapid corrosion process. The patented Mg-Nd-Zn-based alloys (JiaoDa BioMg [JDBM]) have been developed in Shanghai Jiao Tong University in recent years. The alloy series exhibit lower biodegradation rate and homogeneous nanophasic degradation patterns as compared with other biodegradable Mg alloys. The in vitro cytotoxicity tests using various types of cells indicate excellent biocompatibility of JDBM. Finally, bone implants using JDBM-1 alloy and cardiovascular stents using JDBM-2 alloy have been successfully fabricated and in vivo long-term assessment via implantation in animal model have been performed. The results confirmed the reduced degradation rate in vivo, excellent tissue compatibility and long-term structural and mechanical durability. Thus, this novel Mg-alloy series with highly uniform nanophasic biodegradation represent a major breakthrough in the field and a promising candidate for manufacturing the next generation biodegradable implants.
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Affiliation(s)
- Wenjiang Ding
- Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
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20
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Suwannasom P, Sotomi Y, Tateishi H, Tenekecioglu E, Zeng Y, Kraak RP, Wykrzykowska JJ, De Winter RJ, Serruys PW, Onuma Y. Bioresorbable drug-eluting scaffolds for treatment of vascular disease. Expert Opin Drug Deliv 2016; 13:725-39. [PMID: 26865247 DOI: 10.1517/17425247.2016.1153062] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
INTRODUCTION Theoretical advantages of fully bioresorbable scaffold (BRS) stem from transient vessel support without rigid caging. Therefore, it could reduce long-term adverse events associated with the presence of foreign materials. AREAS COVERED This article will provide an overview of: drug-eluting BRS for various applications in the treatment of vascular disease; The mechanisms of active agent release from such scaffolds; currently available drug-eluting BRS and their future applications are also discussed. EXPERT OPINION The current BRS have been developed in order to achieve optimal vascular patency while providing long-term safety. The clinical efficacy and safety of BRS in coronary treatment have been reported as equal to that of the current metallic drug eluting stents in simple lesions. The application of BRS can potentially be expanded to other vascular beds. The research in bioengineering for the appropriate materials should not only focus on biocompatibility but also should be tailored according to the sites of implantation, which may require different strength and supporting period. The ultimate goal in this field is to develop a biocompatible device that provides equivalent and complementary therapy to other devices, and is able to disappear when the mechanical support and drug delivery are no longer required.
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Affiliation(s)
- Pannipa Suwannasom
- a AMC Heartcenter, Academic Medical Center , University of Amsterdam , Amsterdam , The Netherlands.,b ThoraxCenter , Erasmus Medical Center , Rotterdam , The Netherlands.,c Northern Region Heart Center, Faculty of Medicine , Chiang Mai University , Chiang Mai , Thailand
| | - Yohei Sotomi
- a AMC Heartcenter, Academic Medical Center , University of Amsterdam , Amsterdam , The Netherlands
| | - Hiroki Tateishi
- b ThoraxCenter , Erasmus Medical Center , Rotterdam , The Netherlands
| | | | - Yaping Zeng
- b ThoraxCenter , Erasmus Medical Center , Rotterdam , The Netherlands
| | - Robin P Kraak
- a AMC Heartcenter, Academic Medical Center , University of Amsterdam , Amsterdam , The Netherlands
| | - Joanna J Wykrzykowska
- a AMC Heartcenter, Academic Medical Center , University of Amsterdam , Amsterdam , The Netherlands
| | - Robbert J De Winter
- a AMC Heartcenter, Academic Medical Center , University of Amsterdam , Amsterdam , The Netherlands
| | - Patrick W Serruys
- d International Centre for Circulatory Health, NHLI , Imperial College London , London , UK
| | - Yoshinobu Onuma
- b ThoraxCenter , Erasmus Medical Center , Rotterdam , The Netherlands
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21
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Roopmani P, Sethuraman S, Satheesh S, Maheswari Krishnan U. The metamorphosis of vascular stents: passive structures to smart devices. RSC Adv 2016. [DOI: 10.1039/c5ra19109b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
The role of nanotechnology enabled techniques in the evolution of vascular stents.
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Affiliation(s)
- Purandhi Roopmani
- Centre for Nanotechnology and Advanced Biomaterials (CeNTAB)
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur-613 401
- India
| | - Swaminathan Sethuraman
- Centre for Nanotechnology and Advanced Biomaterials (CeNTAB)
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur-613 401
- India
| | - Santhosh Satheesh
- Jawaharlal Institute of Post Graduate Medical Education and Research (JIPMER)
- Department of Cardiology
- Pondicherry-605 006
- India
| | - Uma Maheswari Krishnan
- Centre for Nanotechnology and Advanced Biomaterials (CeNTAB)
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur-613 401
- India
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22
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Jenjob R, Taranamai P, Na K, Yang SG. Recent trend in applications of polymer materials to stents. GASTROINTESTINAL INTERVENTION 2015. [DOI: 10.18528/gii150022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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23
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Dutau H, Musani AI, Laroumagne S, Darwiche K, Freitag L, Astoul P. Biodegradable Airway Stents - Bench to Bedside: A Comprehensive Review. Respiration 2015; 90:512-521. [PMID: 26613524 DOI: 10.1159/000442054] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Accepted: 10/22/2015] [Indexed: 04/13/2024] Open
Abstract
Airway stents are indicated to treat symptomatic narrowing or to close fistulas of the central airways. They are generally divided into two types: the silicone stents and the metallic stents. Unlike in malignancies, removability is a major objective of temporary stenting in benign conditions, which poses the challenge of a new rigid bronchoscopic procedure under general anesthesia and stent removal with all its attendant risks and costs. The concept of a biodegradable (BD) stent that could maintain the patency of an airway for a predetermined duration of time is very appealing. These BD stents would gradually degrade and eventually vanish from the airway once they are no longer needed. Such stents are currently an area of intense research. Another very promising concept of drug delivery with such stents is also a very exciting area of current research. The aim of this comprehensive review is to discuss all pertinent available literature on the use of BD materials in various clinical applications and to extensively review all animal and humans trials involving BD airway stents.
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Affiliation(s)
- Hervé Dutau
- Thoracic Oncology, Pleural Diseases and Interventional Pulmonology Department, North University Hospital, Marseille, France
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24
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Nappi F, Carotenuto AR, Di Vito D, Spadaccio C, Acar C, Fraldi M. Stress-shielding, growth and remodeling of pulmonary artery reinforced with copolymer scaffold and transposed into aortic position. Biomech Model Mechanobiol 2015; 15:1141-57. [PMID: 26603438 DOI: 10.1007/s10237-015-0749-y] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Accepted: 11/13/2015] [Indexed: 12/11/2022]
Abstract
Ross operation, i.e., the use of autologous pulmonary artery to replace diseased aortic valve, has been recently at the center of a vivid debate regarding its unjust underuse in the surgical practice. Keystone of the procedure regards the use of an autologous biologically available graft which would preserve the anticoagulative and tissue homeostatic functions normally exerted by the native leaflets and would harmoniously integrate in the vascular system, allowing for progressive somatic growth of aortic structures. With this respect, recently, some of the authors have successfully pioneered a large animal model of transposition of pulmonary artery in systemic pressure load in order to reproduce the clinical scenario in which this procedure might be applied and allow for the development and testing of different devices or techniques to improve the pulmonary autograft (PA) performance, by testing a bioresorbable mesh for PA reinforcement. In the present work, to support and supplement the in vivo animal experimentation, a mathematical model is developed in order to simulate the biomechanical changes in pulmonary artery subjected to systemic pressure load and reinforced with a combination of resorbable and auxetic synthetic materials. The positive biological effects on vessel wall remodeling, the regional somatic growth phenomena and prevention of dilatative degeneration have been analyzed. The theoretical outcomes show that a virtuous biomechanical cooperation between biological and synthetic materials takes place, stress-shielding guiding the physiological arterialization of vessel walls, consequently determining the overall success of the autograft system.
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Affiliation(s)
| | - Angelo Rosario Carotenuto
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Naples, Italy
| | - Donato Di Vito
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Naples, Italy.,Leibniz-Institut für Polymerforschung, Dresden, Germany
| | - Cristiano Spadaccio
- Department of Cardiothoracic Surgery, Golden Jubilee National Hospital, Clydebank, Glasgow, UK
| | - Cristophe Acar
- Department of Cardiovascular Surgery, Hopital de la Salpetriere, Paris, France
| | - Massimiliano Fraldi
- Department of Structures for Engineering and Architecture, University of Napoli Federico II, Naples, Italy. .,Interdisciplinary Research Center for Biomaterials, University of Napoli Federico II, Naples, Italy.
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25
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Lange J, de Souza FG, Nele M, Tavares FW, Segtovich ISV, da Silva GCQ, Pinto JC. Molecular Dynamic Simulation of Oxaliplatin Diffusion in Poly(lactic acid-co
-glycolic acid). Part A: Parameterization and Validation of the Force-Field CVFF. MACROMOL THEOR SIMUL 2015. [DOI: 10.1002/mats.201500049] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jurgen Lange
- Escola de Química, Departamento de Engenharia Química, Programa de Engenharia Química (PEQ/COPPE); Universidade Federal do Rio de Janeiro, Cidade Universitaria; Rio de Janeiro 21941-972 Brazil
| | - Fernando Gomes de Souza
- Instituto de Macromoléculas Professora Eloisa Mano (IMA), Universidade Federal do Rio de Janeiro; Cidade Universitária; Rio de Janeiro 21941-598 Brazil
| | - Marcio Nele
- Escola de Química, Departamento de Engenharia Química, Federal do Rio de Janeiro; Cidade Universitaria; Rio de Janeiro 21941-972 Brazil
| | - Frederico Wanderley Tavares
- Escola de Química, Departamento de Engenharia Química, Federal do Rio de Janeiro; Cidade Universitaria; Rio de Janeiro 21941-972 Brazil
| | - Iuri Soter Viana Segtovich
- Escola de Química, Programa de pós-graduação em Tecnologia de Processos Químicos e Bioquímicos /TPQB; Universidade Federal; Rio de Janeiro 21941-909 Brazil
| | | | - José Carlos Pinto
- Escola de Química, Departamento de Engenharia Química, Programa de Engenharia Química (PEQ/COPPE); Universidade Federal do Rio de Janeiro, Cidade Universitaria; Rio de Janeiro 21941-972 Brazil
- Escola de Química, Departamento de Engenharia Química, Federal do Rio de Janeiro; Cidade Universitaria; Rio de Janeiro 21941-972 Brazil
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26
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Yang Z, Yang Y, Xiong K, Li X, Qi P, Tu Q, Jing F, Weng Y, Wang J, Huang N. Nitric oxide producing coating mimicking endothelium function for multifunctional vascular stents. Biomaterials 2015; 63:80-92. [DOI: 10.1016/j.biomaterials.2015.06.016] [Citation(s) in RCA: 133] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Revised: 06/08/2015] [Accepted: 06/11/2015] [Indexed: 12/20/2022]
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27
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Li J, Zhang K, Wu J, Zhang L, Yang P, Tu Q, Huang N. Tailoring of the titanium surface by preparing cardiovascular endothelial extracellular matrix layer on the hyaluronic acid micro-pattern for improving biocompatibility. Colloids Surf B Biointerfaces 2015; 128:201-210. [DOI: 10.1016/j.colsurfb.2015.01.010] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Revised: 12/19/2014] [Accepted: 01/07/2015] [Indexed: 01/14/2023]
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28
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Jones L, Moir J, Brown C, Williams R, French JJ. The novel use of a biodegradable stent placed by percutaneous transhepatic cholangiography for the treatment of a hepaticojejunostomy biliary leak following an extended left hepatectomy and pancreaticoduodenectomy. Ann R Coll Surg Engl 2014; 96:e1-3. [PMID: 25198957 DOI: 10.1308/003588414x13946184901326] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
A 61-year-old man presented with jaundice, and subsequently underwent an extended left hepatectomy and pancreaticoduodenectomy for a cholangiocarcinoma invading the head of the pancreas. The patient developed sepsis due to a biliary leak at the hepaticojejunostomy. We describe the original use of a biodegradable stent, deployed via percutaneous transhepatic cholangiography into the Roux limb, resulting in good drainage and resolution of sepsis. The chief benefit of this procedure is the lack of need for subsequent removal as well as purported reduced biofilm accumulation. We believe this to be the first reported case of this type and the literature surrounding the subject is also discussed.
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Affiliation(s)
- L Jones
- Newcastle upon Tyne Hospitals NHS Foundation Trust, UK
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29
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Vaithilingam J, Kilsby S, Goodridge RD, Christie SDR, Edmondson S, Hague RJM. Functionalisation of Ti6Al4V components fabricated using selective laser melting with a bioactive compound. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 46:52-61. [PMID: 25491959 DOI: 10.1016/j.msec.2014.10.015] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Revised: 08/12/2014] [Accepted: 10/02/2014] [Indexed: 11/30/2022]
Abstract
Surface modification of an implant with a biomolecule is used to improve its biocompatibility and to reduce post-implant complications. In this study, a novel approach has been used to functionalise phosphonic acid monolayers with a drug. Ti6Al4V components fabricated using selective laser melting (SLM) were functionalised with Paracetamol (a pharmaceutically relevant biomolecule) using phosphonic acid based self-assembled monolayers (SAMs). The attachment, stability of the monolayers on the SLM fabricated surface and functionalisation of SAMs with Paracetamol were studied using X-ray photoelectron spectroscopy (XPS) and surface wettability measurements. The obtained results confirmed that SAMs were stable on the Ti6Al4V surface for over four weeks and then began to desorb from the surface. The reaction used to functionalise the phosphonic acid monolayers with Paracetamol was noted to be successful. Thus, the proposed method has the potential to immobilise drugs/proteins to SAM coated surfaces and improve their biocompatibility and reduce post-implant complications.
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Affiliation(s)
- Jayasheelan Vaithilingam
- Additive Manufacturing and 3D Printing Research Group, School of Engineering, The University of Nottingham, Nottingham NG7 2RD, UK
| | - Samuel Kilsby
- Department of Chemistry, Loughborough University, Loughborough LE11 3TU, UK
| | - Ruth D Goodridge
- Additive Manufacturing and 3D Printing Research Group, School of Engineering, The University of Nottingham, Nottingham NG7 2RD, UK.
| | | | - Steve Edmondson
- School of Materials, The University of Manchester, Manchester M13 9PL, UK
| | - Richard J M Hague
- Additive Manufacturing and 3D Printing Research Group, School of Engineering, The University of Nottingham, Nottingham NG7 2RD, UK
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30
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Bae BC, Yang SG, Jeong S, Lee DH, Na K, Kim JM, Costamagna G, Kozarek RA, Isayama H, Deviere J, Seo DW, Nageshwar Reddy D. Polymeric photosensitizer-embedded self-expanding metal stent for repeatable endoscopic photodynamic therapy of cholangiocarcinoma. Biomaterials 2014; 35:8487-95. [PMID: 25043500 DOI: 10.1016/j.biomaterials.2014.07.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Accepted: 07/01/2014] [Indexed: 02/07/2023]
Abstract
Photodynamic therapy (PDT) is a new therapeutic approach for the palliative treatment of malignant bile duct obstruction. In this study, we designed photosensitizer-embedded self-expanding nonvascular metal stent (PDT-stent) which allows repeatable photodynamic treatment of cholangiocarcinoma without systemic injection of photosensitizer. Polymeric photosensitizer (pullulan acetate-conjugated pheophorbide A; PPA) was incorporated in self-expanding nonvascular metal stent. Residence of PPA in the stent was estimated in buffer solution and subcutaneous implantation on mouse. Photodynamic activity of PDT-stent was evaluated through laserexposure on stent-layered tumor cell lines, HCT-116 tumor-xenograft mouse models and endoscopic intervention of PDT-stent on bile duct of mini pigs. Photo-fluorescence imaging of the PDT-stent demonstrated homogeneous embedding of polymeric Pheo-A (PPA) on stent membrane. PDT-stent sustained its photodynamic activities at least for 2 month. And which implies repeatable endoscopic PDT is possible after stent emplacement. The PDT-stent after light exposure successfully generated cytotoxic singlet oxygen in the surrounding tissues, inducing apoptotic degradation of tumor cells and regression of xenograft tumors on mouse models. Endoscopic biliary in-stent photodynamic treatments on minipigs also suggested the potential efficacy of PDT-stent on cholangiocarcinoma. In vivo and in vitro studies revealed our PDT-stent, allows repeatable endoscopic biliary PDT, has the potential for the combination therapy (stent plus PDT) of cholangiocarcinoma.
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Affiliation(s)
- Byoung-chan Bae
- Department of Biotechnology, The Catholic University of Korea, 43 Jibong-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do 420-743, Republic of Korea
| | - Su-Geun Yang
- Department of New Drug Development and NCEED, School of Medicine, Inha University, Incheon, Republic of Korea
| | - Seok Jeong
- Division of Gastroenterology, Department of Internal Medicine, Inha University Hospital, Incheon, Republic of Korea
| | - Don Haeng Lee
- Utah-Inha DDS and Advanced Therapeutics, B-404, Meet-You-All Tower, Songdo-dong, Yeonsu-gu, Incheon, Republic of Korea; Division of Gastroenterology, Department of Internal Medicine, Inha University Hospital, Incheon, Republic of Korea; Department of New Drug Development and NCEED, School of Medicine, Inha University, Incheon, Republic of Korea
| | - Kun Na
- Department of Biotechnology, The Catholic University of Korea, 43 Jibong-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do 420-743, Republic of Korea.
| | - Joon Mee Kim
- Department of Pathology, Inha University Hospital, Incheon, Republic of Korea
| | - Guido Costamagna
- Digestive Endoscopy Unit, Department of Surgery, Catholic University, Rome, Italy; Department of Radiology, Catholic University, Rome, Italy
| | - Richard A Kozarek
- Digestive Disease Institute, Virginia Mason Medical Center, Seattle, USA
| | - Hiroyuki Isayama
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Jacques Deviere
- Department of Gastroenterology, Erasme University Hospital, Brussels, Belgium
| | - Dong Wan Seo
- Division of Gastroenterology, Asan Medical Center, Seoul, Republic of Korea
| | - D Nageshwar Reddy
- Department of Gastroenterology, Asian Institute of Gastroenterology, Hyderabad, India
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31
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Goodfriend AC, Welch TR, Barker G, Ginther R, Riegel MS, Reddy SV, Wang J, Nugent A, Forbess J. Novel bioresorbable stent coating for drug release in congenital heart disease applications. J Biomed Mater Res A 2014; 103:1761-70. [PMID: 25196819 DOI: 10.1002/jbm.a.35313] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Revised: 05/06/2014] [Accepted: 08/14/2014] [Indexed: 11/09/2022]
Abstract
A novel double opposed helical poly-l-lactic acid (PLLA) bioresorbable stent has been designed for use in pediatrics. The aim was to test the PLLA stent biocompatibility. The PLLA stent was immersed into whole pig's blood in a closed loop circuit then fibrin and platelet association was assessed via enzyme-linked immunosorbent assay. D-Dimer was valued at 0.2 ± 0.002 ng/mL and P-selectin 0.43 ± 00.01 ng/mL indicating limited association of fibrin and platelets on the stent. To improve biocompatibility by targeting inflammatory cells, dexamethasone was incorporated on PLLA fibers with two coating methods. Both coatings were poly(l-lactide-co-glycolide) acid (PLGA) but one was made porous with sucrose while the other remained nonporous. There was no change in mechanical properties of the fiber with either coating of PLGA polymer. The total amount of dexamethasone released was then determined for each coating. The cumulative drug release for the porous fiber was significantly higher (∼100%) over 8 weeks than the nonporous fiber (40%). Surface examination of the fiber with scanning electron microscopy showed more surface microfracturing in coatings that contain pores. The biocompatibility of this novel stent was demonstrated. Mechanical properties of the fiber were not altered by coating with PLGA polymer. Anti-inflammatory drug release was optimized using a porous PLGA polymer.
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Affiliation(s)
- Amy C Goodfriend
- Department of Pediatric Cardiovascular and Thoracic Surgery, University of Texas Southwestern Medical Center, Dallas, Texas, 75390
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Yang Y, Qi P, Wen F, Li X, Xia Q, Maitz MF, Yang Z, Shen R, Tu Q, Huang N. Mussel-inspired one-step adherent coating rich in amine groups for covalent immobilization of heparin: hemocompatibility, growth behaviors of vascular cells, and tissue response. ACS APPLIED MATERIALS & INTERFACES 2014; 6:14608-20. [PMID: 25105346 DOI: 10.1021/am503925r] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Heparin, an important polysaccharide, has been widely used for coatings of cardiovascular devices because of its multiple biological functions including anticoagulation and inhibition of intimal hyperplasia. In this study, surface heparinization of a commonly used 316L stainless steel (SS) was explored for preparation of a multifunctional vascular stent. Dip-coating of the stents in an aqueous solution of dopamine and hexamethylendiamine (HD) (PDAM/HD) was presented as a facile method to form an adhesive coating rich in primary amine groups, which was used for covalent heparin immobilization via active ester chemistry. A heparin grafting density of about 900 ng/cm(2) was achieved with this method. The retained bioactivity of the immobilized heparin was confirmed by a remarkable prolongation of the activated partial thromboplastin time (APTT) for about 15 s, suppression of platelet adhesion, and prevention of the denaturation of adsorbed fibrinogen. The Hep-PDAM/HD also presented a favorable microenvironment for selectively enhancing endothelial cell (EC) adhesion, proliferation, migration and release of nitric oxide (NO), and at the same time inhibiting smooth muscle cell (SMC) adhesion and proliferation. Upon subcutaneous implantation, the Hep-PDAM/HD exhibited mitigated tissue response, with thinner fibrous capsule and less granulation formation compared to the control 316L SS. This number of unique functions qualifies the heparinized coating as an attractive alternative for the design of a new generation of stents.
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Affiliation(s)
- Ying Yang
- Key Laboratory of Advanced Technology for Materials of Education Ministry, ‡The Institute of Biomaterials and Surface Engineering, School of Materials Science and Engineering, and #Laboratory of Biosensing and MicroMechatronics, Southwest Jiaotong University , Chengdu 610031, China
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Yang Z, Zhong S, Yang Y, Maitz MF, Li X, Tu Q, Qi P, Zhang H, Qiu H, Wang J, Huang N. Polydopamine-mediated long-term elution of the direct thrombin inhibitor bivalirudin from TiO2nanotubes for improved vascular biocompatibility. J Mater Chem B 2014; 2:6767-6778. [DOI: 10.1039/c4tb01118j] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Yang Z, Xiong K, Qi P, Yang Y, Tu Q, Wang J, Huang N. Gallic acid tailoring surface functionalities of plasma-polymerized allylamine-coated 316L SS to selectively direct vascular endothelial and smooth muscle cell fate for enhanced endothelialization. ACS APPLIED MATERIALS & INTERFACES 2014; 6:2647-2656. [PMID: 24484285 DOI: 10.1021/am405124z] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The creation of a platform for enhanced vascular endothelia cell (VEC) growth while suppressing vascular smooth muscle cell (VSMC) proliferation offers possibility for advanced coatings of vascular stents. Gallic acid (GA), a chemically unique phenolic acid with important biological functions, presents benefits to the cardiovascular disease therapy because of its superior antioxidant effect and a selectivity to support the growth of ECs more than SMCs. In this study, GA was explored to tailor such a multifunctional stent surface combined with plasma polymerization technique. On the basis of the chemical coupling reaction, GA was bound to an amine-group-rich plasma-polymerized allylamine (PPAam) coating. The GA-functionalized PPAam (GA-PPAam) surface created a favorable microenvironment to obtain high ECs and SMCs selectivity. The GA-PPAam coating showed remarkable enhancement in the adhesion, viability, proliferation, migration, and release of nitric oxide (NO) of human umbilical vein endothelial cells (HUVECs). The GA-PPAam coating also resulted in remarkable inhibition effect on human umbilical artery smooth muscle cell (HUASMC) adhesion and proliferation. These striking findings may provide a guide for designing the new generation of multifunctional vascular devices.
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Affiliation(s)
- Zhilu Yang
- Key Laboratory of Advanced Technology for Materials of Education Ministry, ‡The Institute of Biomaterials and Surface Engineering, School of Materials Science and Engineering, and §Laboratory of Biosensing and MicroMechatronics, Southwest Jiaotong University , Chengdu 610031, China
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35
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Non-vascular drug eluting stents as localized controlled drug delivery platform: Preclinical and clinical experience. J Control Release 2013; 172:105-117. [DOI: 10.1016/j.jconrel.2013.08.010] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Revised: 08/03/2013] [Accepted: 08/05/2013] [Indexed: 01/10/2023]
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36
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Vrana NE, Lavalle P, Dokmeci MR, Dehghani F, Ghaemmaghami AM, Khademhosseini A. Engineering functional epithelium for regenerative medicine and in vitro organ models: a review. TISSUE ENGINEERING PART B-REVIEWS 2013; 19:529-43. [PMID: 23705900 DOI: 10.1089/ten.teb.2012.0603] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Recent advances in the fields of microfabrication, biomaterials, and tissue engineering have provided new opportunities for developing biomimetic and functional tissues with potential applications in disease modeling, drug discovery, and replacing damaged tissues. An intact epithelium plays an indispensable role in the functionality of several organs such as the trachea, esophagus, and cornea. Furthermore, the integrity of the epithelial barrier and its degree of differentiation would define the level of success in tissue engineering of other organs such as the bladder and the skin. In this review, we focus on the challenges and requirements associated with engineering of epithelial layers in different tissues. Functional epithelial layers can be achieved by methods such as cell sheets, cell homing, and in situ epithelialization. However, for organs composed of several tissues, other important factors such as (1) in vivo epithelial cell migration, (2) multicell-type differentiation within the epithelium, and (3) epithelial cell interactions with the underlying mesenchymal cells should also be considered. Recent successful clinical trials in tissue engineering of the trachea have highlighted the importance of a functional epithelium for long-term success and survival of tissue replacements. Hence, using the trachea as a model tissue in clinical use, we describe the optimal structure of an artificial epithelium as well as challenges of obtaining a fully functional epithelium in macroscale. One of the possible remedies to address such challenges is the use of bottom-up fabrication methods to obtain a functional epithelium. Modular approaches for the generation of functional epithelial layers are reviewed and other emerging applications of microscale epithelial tissue models for studying epithelial/mesenchymal interactions in healthy and diseased (e.g., cancer) tissues are described. These models can elucidate the epithelial/mesenchymal tissue interactions at the microscale and provide the necessary tools for the next generation of multicellular engineered tissues and organ-on-a-chip systems.
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Affiliation(s)
- Nihal E Vrana
- 1 Institut National de la Santé et de la Recherche Médicale , INSERM, UMR-S 1121, "Biomatériaux et Bioingénierie," Strasbourg Cedex, France
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37
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Zhu YQ, Cui WG, Cheng YS, Chang J, Chen NW, Yan L. Evaluation of biodegradable paclitaxel-eluting nanofibre-covered metal stents for the treatment of benign cardia stricture in an experimental model. Br J Surg 2013; 100:784-93. [PMID: 23553755 DOI: 10.1002/bjs.9106] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/04/2013] [Indexed: 12/27/2022]
Abstract
BACKGROUND Benign strictures at the cardia are troublesome for patients and often require repeated endoscopic treatments. Paclitaxel can reduce fibrosis. This study evaluated a biodegradable paclitaxel-eluting nanofibre-covered metal stent for the treatment of benign cardia stricture in vitro and in vivo. METHODS Drug release was investigated in vitro at pH 7·4 and 4·0. Eighty dogs were divided randomly into four groups (each n = 20): controls (no stent), bare stent (retained for 1 week), and two drug-eluting stent (DES) groups with retention for either 1 week (DES-1w) or 4 weeks (DES-4w). Lower oesophageal sphincter pressure (LOSP) and 5-min barium height (5-mBH) were assessed before, immediately after stent deployment, at 1 week, and 1, 3 and 6 months later. Five dogs in each group were killed for histological examination at each follow-up point. RESULTS Stent migration rates were similar (0 bare stent versus 2 DES; P = 0·548). The percentage and amount of paclitaxel released in vitro was higher at pH 4·0 than at pH 7·4. After 6 months, LOSP and 5-mBH were both improved in the DES-1w (P = 0·004 and P = 0·049) and DES-4w (both P < 0·001) groups compared with the bare-stent group, with better relief when the stent was retained for 4 weeks (P = 0·004 and P = 0·007). The DES was associated with a reduced peak inflammatory reaction and less scar formation compared with bare stents, especially when inserted for 4 weeks. CONCLUSION The DES was more effective for the treatment of benign cardia stricture than bare stents in a canine model. Retention of the DES for 4 weeks led to a better clinical and pathological outcome than 1 week.
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Affiliation(s)
- Y-Q Zhu
- Department of Radiology, Sixth Affiliated People's Hospital, Medical School of Shanghai Jiao Tong University, Shanghai, China
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38
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Warren PD, Sycks DG, McGrath DV, Vande Geest JP. Modeling the microstructurally dependent mechanical properties of poly(ester-urethane-urea)s. J Biomed Mater Res A 2013; 101:3382-7. [DOI: 10.1002/jbm.a.34641] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Accepted: 01/09/2013] [Indexed: 11/09/2022]
Affiliation(s)
- P Daniel Warren
- Graduate Interdisciplinary Program in Biomedical Engineering, The University of Arizona, Tucson, Arizona 85721-0119
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Welch TR, Eberhart RC, Reddy SV, Wang J, Nugent A, Forbess J. Novel Bioresorbable Stent Design and Fabrication: Congenital Heart Disease Applications. Cardiovasc Eng Technol 2013. [DOI: 10.1007/s13239-013-0136-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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40
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Yang Z, Tu Q, Wang J, Huang N. The role of heparin binding surfaces in the direction of endothelial and smooth muscle cell fate and re-endothelialization. Biomaterials 2012; 33:6615-25. [DOI: 10.1016/j.biomaterials.2012.06.055] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Accepted: 06/22/2012] [Indexed: 11/25/2022]
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41
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Yang Z, Tu Q, Zhu Y, Luo R, Li X, Xie Y, Maitz MF, Wang J, Huang N. Mussel-inspired coating of polydopamine directs endothelial and smooth muscle cell fate for re-endothelialization of vascular devices. Adv Healthc Mater 2012. [PMID: 23184789 DOI: 10.1002/adhm.201200073] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Polydopamine (PDAM), a mussel adhesive protein inspired coating that can be easily deposited onto a wide range of metallic, inorganic, and organic materials, gains interest also in the field of biomaterials. In this work, PDAM is applied as coating on 316L stainless steel (SS) stents and the response of cells of the blood vessel wall, human umbilical vein endothelial cell (HUVEC), and human umbilical artery smooth muscle cell (HUASMC) as predictors for re-endothelialization is tested. It is found that the PDAM-modified surface significantly enhances HUVEC adhesion, proliferation, and migration, release of nitric oxide (NO), and secretion of prostaglandin I(2) (PGI(2) ). Additionally, the PDAM-modified surface shows a remarkable ability to decrease the adhesion and proliferation of HUASMCs. As a blood-contacting material, the PDAM tends to improve the hemocompatibility compared with the substrate 316L SS. It is noteworthy that the PDAM coating shows good resistance to the deformation behavior of compression and expansion of a stent. These data suggest the potential of PDAM as a blood-contacting material for the application in vascular stents or grafts.
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Affiliation(s)
- Zhilu Yang
- Key Lab. of Advanced Technology for Materials of Education Ministry, Southwest Jiaotong University, Chengdu, 610031, China
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42
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Shen Y, Lu F, Hou J, Shen Y, Guo S. Incorporation of paclitaxel solid dispersions with poloxamer188 or polyethylene glycol to tune drug release from poly(ϵ-caprolactone) films. Drug Dev Ind Pharm 2012; 39:1187-96. [DOI: 10.3109/03639045.2012.704042] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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43
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Rong HJ, Chen WL, Guo SR, Lei L, Shen YY. PCL films incorporated with paclitaxel/5-fluorouracil: Effects of formulation and spacial architecture on drug release. Int J Pharm 2012; 427:242-51. [DOI: 10.1016/j.ijpharm.2012.02.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2011] [Revised: 01/12/2012] [Accepted: 02/05/2012] [Indexed: 11/29/2022]
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Strandberg E, Zeltinger J, Schulz DG, Kaluza GL. Late Positive Remodeling and Late Lumen Gain Contribute to Vascular Restoration by a Non-Drug Eluting Bioresorbable Scaffold. Circ Cardiovasc Interv 2012; 5:39-46. [DOI: 10.1161/circinterventions.111.964270] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background—
The interplay between mechanical dilatation, resorption, and arterial response following implantation of bioresorbable scaffolds is still poorly understood.
Methods and Results—
Long-term geometric changes in porcine coronary arteries in relation to gradual degradation of bioresorbable scaffolds were assessed in comparison with bare metal stents (BMS). Intravascular ultrasound (IVUS)-derived lumen, outer stent/scaffold, and reference vessel areas were evaluated in 94 polymer scaffolds and 46 BMS at 5 days and 3, 6, 12, 18, 24, and 55 months, in addition to polymer scaffold radial crush strength and molecular weight (M
W
) at 3, 6, and 12 months. BMS outer stent area and lumen area remained constant through 55 months (
P
=0.05, but within 1 standard deviation of 100%, and
P
=0.58, respectively), while significant increases were exhibited by polymer-scaffolded vessels with the maximum late lumen gain at 24 months, paralleled by the outer scaffold area increase, and then remaining at that increased level at 55 months (
P
<0.01). By 12 months polymer scaffolds experienced significant reductions in radial strength and M
W
, while the animals underwent the largest weight gain. At 3 months and beyond, the patency ratio (lumen area/reference vessel area) of BMS remained constant (0.71 to 0.85,
P
=0.49). In contrast, that of polymer scaffolds increased and approached 1 (
P
=0.13).
Conclusions—
Bioresorbable polymer scaffolds allow restoration of the treated segment's ability to remodel outward to achieve level lumen transition between reference vessel and scaffold-treated regions, a process mediated by animal growth and scaffold degradation. This also introduces a challenge to standard analyses of IVUS outcomes relying on constant stent diameters over time.
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Affiliation(s)
- Erika Strandberg
- From the REVA Medical, Inc, San Diego, CA (E.S., J.Z.); Center for Research in Cardiovascular Interventions, The Methodist Hospital Research Institute, Houston, TX (D.G.S.); Jack H. Skirball Center for Cardiovascular Research, Orangeburg, NY (G.L.K.)
| | - Joan Zeltinger
- From the REVA Medical, Inc, San Diego, CA (E.S., J.Z.); Center for Research in Cardiovascular Interventions, The Methodist Hospital Research Institute, Houston, TX (D.G.S.); Jack H. Skirball Center for Cardiovascular Research, Orangeburg, NY (G.L.K.)
| | - Daryl G. Schulz
- From the REVA Medical, Inc, San Diego, CA (E.S., J.Z.); Center for Research in Cardiovascular Interventions, The Methodist Hospital Research Institute, Houston, TX (D.G.S.); Jack H. Skirball Center for Cardiovascular Research, Orangeburg, NY (G.L.K.)
| | - Greg L. Kaluza
- From the REVA Medical, Inc, San Diego, CA (E.S., J.Z.); Center for Research in Cardiovascular Interventions, The Methodist Hospital Research Institute, Houston, TX (D.G.S.); Jack H. Skirball Center for Cardiovascular Research, Orangeburg, NY (G.L.K.)
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Ng AHC, Ng NSP, Zhu GH, Lim LHY, Venkatraman SS. A fully degradable tracheal stent: In vitro and in vivo characterization of material degradation. J Biomed Mater Res B Appl Biomater 2011; 100:693-9. [DOI: 10.1002/jbm.b.32501] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2011] [Revised: 09/07/2011] [Accepted: 09/27/2011] [Indexed: 11/06/2022]
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Zhu GH, Ng AHC, Venkatraman SS, Boey FYC, Wee ALY, Trasti SL, Yee Lim LH. A novel bioabsorbable drug-eluting tracheal stent. Laryngoscope 2011; 121:2234-9. [DOI: 10.1002/lary.22175] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2011] [Revised: 06/01/2011] [Accepted: 06/03/2011] [Indexed: 11/08/2022]
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Casalini T, Rossi F, Santoro M, Perale G. Structural characterization of poly-l-lactic acid (P(L)LA) and poly(glycolic acid)(PGA) oligomers. Int J Mol Sci 2011; 12:3857-70. [PMID: 21747712 PMCID: PMC3131596 DOI: 10.3390/ijms12063857] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2011] [Revised: 05/30/2011] [Accepted: 06/03/2011] [Indexed: 12/05/2022] Open
Abstract
Structural characterization of poly-l-lactic acid (P(L)LA) and poly(glycolic acid) (PGA) oligomers containing three units was carried out with an atomistic approach. Oligomer structures were first optimized through quantum chemical calculations, using density functional theory (DFT); rotational barriers concerning dihedral angles along the chain were then investigated. Diffusion coefficients of l-lactic acid and glycolic acid in pure water were estimated through molecular dynamic (MD) simulations. Monomer structures were obtained with quantum chemical computation in implicit water using DFT method; atomic charges were fitted with Restrained Electrostatic Potentials (RESP) formalism, starting from electrostatic potentials calculated with quantum chemistry. MD simulations were carried out in explicit water, in order to take into account solvent presence.
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Affiliation(s)
- Tommaso Casalini
- Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano, Via Mancinelli 7, 20131 Milano, Italy; E-Mails: (T.C.); (F.R.); (M.S.)
| | - Filippo Rossi
- Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano, Via Mancinelli 7, 20131 Milano, Italy; E-Mails: (T.C.); (F.R.); (M.S.)
| | - Marco Santoro
- Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano, Via Mancinelli 7, 20131 Milano, Italy; E-Mails: (T.C.); (F.R.); (M.S.)
| | - Giuseppe Perale
- Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano, Via Mancinelli 7, 20131 Milano, Italy; E-Mails: (T.C.); (F.R.); (M.S.)
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Lei L, Guo SR, Chen WL, Rong HJ, Lu F. Stents as a platform for drug delivery. Expert Opin Drug Deliv 2011; 8:813-31. [DOI: 10.1517/17425247.2011.572068] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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