1
|
Müller M, Cascales JP, Marks HL, Wang-Evers M, Manstein D, Evans CL. Phosphorescent Microneedle Array for the Measurement of Oxygen Partial Pressure in Tissue. ACS Sens 2022; 7:3440-3449. [PMID: 36305608 DOI: 10.1021/acssensors.2c01775] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The knowledge of the exact oxygen partial pressure in tissue is crucial for patient care and in the treatment of ischemic medical conditions. However, current methods to assess oxygen partial pressure in tissue suffer from a variety of disadvantages, including complex equipment and procedures that necessitate trained personnel. Additionally, the barrier function of the stratum corneum reduces oxygen exchange and can consequently hamper surface measurements of rapidly changing oxygen partial pressure in tissue. To overcome these challenges, a novel, easy-to-use technique to monitor the oxygen partial pressure in tissue using microneedle arrays (MNAs) has been developed. The MNAs can be made from poly(ethyl methacrylate) and poly(propyl methacrylate) and overcome the skin's barrier function to measure oxygen in the capillary bed and interstitial fluid of the skin. The MNAs' tips are embedded with an oxygen-sensitive phosphorescent metalloporphyrin, where the oxygen partial pressure inversely correlates to changes in both emission intensity and phosphorescence lifetime of the in-house developed red emitting Pt-core porphyrin. It was demonstrated that the oxygen-sensing MNAs are sufficiently robust to puncture human skin via rupture of the stratum corneum, and that the MNAs can detect changes in oxygen partial pressure in skin within the physiologically relevant range (0-160 mmHg). Additionally, the MNAs can be combined with a wearable wireless optical readout system, making these oxygen-sensing MNAs a novel wearable and portable method for user-friendly monitoring of oxygen partial pressure in skin.
Collapse
Affiliation(s)
- Matthias Müller
- Wellman Center for Photomedicine, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts02129, United States
| | - Juan Pedro Cascales
- Wellman Center for Photomedicine, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts02129, United States
| | - Haley L Marks
- Cutaneous Biology Research Center, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts02129, United States
| | - Michael Wang-Evers
- Cutaneous Biology Research Center, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts02129, United States
| | - Dieter Manstein
- Cutaneous Biology Research Center, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts02129, United States
| | - Conor L Evans
- Wellman Center for Photomedicine, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts02129, United States
| |
Collapse
|
2
|
Amanpour J, Sharifi-Sanjani N. Mechanical and Thermal Properties of Poly(Tetrahydrofurfuryl Methacrylate) Nano-Composites. J MACROMOL SCI B 2017. [DOI: 10.1080/00222348.2017.1384233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- J. Amanpour
- Polymer Laboratory, School of Chemistry, College of Science, University of Tehran, Tehran, I. R. Iran
| | - N. Sharifi-Sanjani
- Polymer Laboratory, School of Chemistry, College of Science, University of Tehran, Tehran, I. R. Iran
| |
Collapse
|
3
|
Meng Q, Man Z, Dai L, Huang H, Zhang X, Hu X, Shao Z, Zhu J, Zhang J, Fu X, Duan X, Ao Y. A composite scaffold of MSC affinity peptide-modified demineralized bone matrix particles and chitosan hydrogel for cartilage regeneration. Sci Rep 2015; 5:17802. [PMID: 26632447 PMCID: PMC4668577 DOI: 10.1038/srep17802] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Accepted: 11/05/2015] [Indexed: 12/13/2022] Open
Abstract
Articular cartilage injury is still a significant challenge because of the poor intrinsic healing potential of cartilage. Stem cell-based tissue engineering is a promising technique for cartilage repair. As cartilage defects are usually irregular in clinical settings, scaffolds with moldability that can fill any shape of cartilage defects and closely integrate with the host cartilage are desirable. In this study, we constructed a composite scaffold combining mesenchymal stem cells (MSCs) E7 affinity peptide-modified demineralized bone matrix (DBM) particles and chitosan (CS) hydrogel for cartilage engineering. This solid-supported composite scaffold exhibited appropriate porosity, which provided a 3D microenvironment that supports cell adhesion and proliferation. Cell proliferation and DNA content analysis indicated that the DBM-E7/CS scaffold promoted better rat bone marrow-derived MSCs (BMMSCs) survival than the CS or DBM/CS groups. Meanwhile, the DBM-E7/CS scaffold increased matrix production and improved chondrogenic differentiation ability of BMMSCs in vitro. Furthermore, after implantation in vivo for four weeks, compared to those in control groups, the regenerated issue in the DBM-E7/CS group exhibited translucent and superior cartilage-like structures, as indicated by gross observation, histological examination, and assessment of matrix staining. Overall, the functional composite scaffold of DBM-E7/CS is a promising option for repairing irregularly shaped cartilage defects.
Collapse
Affiliation(s)
- Qingyang Meng
- Institute of Sports Medicine, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, PR China
| | - Zhentao Man
- Institute of Sports Medicine, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, PR China
| | - Linghui Dai
- Institute of Sports Medicine, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, PR China
| | - Hongjie Huang
- Institute of Sports Medicine, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, PR China
| | - Xin Zhang
- Institute of Sports Medicine, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, PR China
| | - Xiaoqing Hu
- Institute of Sports Medicine, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, PR China
| | - Zhenxing Shao
- Institute of Sports Medicine, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, PR China
| | - Jingxian Zhu
- Institute of Sports Medicine, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, PR China
| | - Jiying Zhang
- Institute of Sports Medicine, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, PR China
| | - Xin Fu
- Institute of Sports Medicine, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, PR China
| | - Xiaoning Duan
- Institute of Sports Medicine, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, PR China
| | - Yingfang Ao
- Institute of Sports Medicine, Beijing Key Laboratory of Sports Injuries, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, PR China
| |
Collapse
|
4
|
Al-Haddad A, Vahid Roudsari R, Satterthwaite JD. Fracture toughness of heat cured denture base acrylic resin modified with Chlorhexidine and Fluconazole as bioactive compounds. J Dent 2013; 42:180-4. [PMID: 24269832 DOI: 10.1016/j.jdent.2013.11.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Revised: 11/05/2013] [Accepted: 11/12/2013] [Indexed: 12/13/2022] Open
Abstract
PURPOSE This study investigated the impact of incorporating Chlorhexidine and Fluconazole as bioactive compounds on the fracture toughness of conventional heat cured denture base acrylic resin material (PMMA). MATERIALS AND METHODS 30 single edge-notched (SEN) samples were prepared and divided into three groups. 10% (mass) Chlorhexidine and 10% (mass) Diflucan powder (4.5% mass Fluconazole) were added to heat cured PMMA respectively to create the two study groups. A third group of conventional heat cured PMMA was prepared as the control group. Fracture toughness (3-point bending test) was carried out for each sample and critical force (Fc) and critical stress intensity factor (KIC) values measured. Data were subject to parametric statistical analysis using one-way ANOVA and Post hoc Bonferroni test (p=0.05). RESULTS Fluconazole had no significant effect on the fracture toughness of the PMMA while Chlorhexidine significantly reduced the KIC and therefore affected the fracture toughness. CONCLUSION When considering addition of a bioactive material to PMMA acrylic, Chlorhexidine will result in reduced fracture toughness of the acrylic base while Fluconazole has no effect.
Collapse
Affiliation(s)
- Alaa Al-Haddad
- Research Student, School of Dentistry, The University of Manchester, Higher Cambridge Street, Manchester M13 9PL, United Kingdom
| | - Reza Vahid Roudsari
- Clinical Lecturer and Honorary Speciality Registrar in Restorative Dentistry, School of Dentistry, The University of Manchester, Higher Cambridge Street, Manchester M13 9PL, United Kingdom.
| | - Julian D Satterthwaite
- Professor in Restorative Dentistry, School of Dentistry, The University of Manchester, Higher Cambridge Street, Manchester M13 9PL, United Kingdom
| |
Collapse
|
5
|
Rawal B, Ribeiro R, Chouksey M, Tripathi K. Biomaterials for Cartilage Repair: A Review. JOURNAL OF MEDICAL SCIENCES 2013. [DOI: 10.3923/jms.2013.615.620] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
6
|
Chlorhexidine-impregnated PEM/THFM polymer exhibits superior activity to fluconazole-impregnated polymer against Candida albicans biofilm formation. Int J Antimicrob Agents 2013; 41:193-6. [DOI: 10.1016/j.ijantimicag.2012.09.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 09/03/2012] [Accepted: 09/07/2012] [Indexed: 11/18/2022]
|
7
|
Duda GN, Eniwumide JO, Sittinger M. Constraints to Articular Cartilage Regeneration. Regen Med 2013. [DOI: 10.1007/978-94-007-5690-8_41] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
8
|
Salim N, Satterthwaite JD, Rautemaa R, Silikas N. Impregnation with antimicrobials challenge bonding properties and water sorption behaviour of an acrylic liner. J Dent 2012; 40:693-9. [DOI: 10.1016/j.jdent.2012.04.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Revised: 04/23/2012] [Accepted: 04/27/2012] [Indexed: 10/28/2022] Open
|
9
|
Chowdhury MA, Hill DJT, Whittaker AK. Mass uptake study of the diffusion of water and SBF into poly(2-hydroxyethyl methacrylate-co-tetrahydrofurfuryl methacrylate) containing aspirin or vitamin B12. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 16:1047-61. [PMID: 16128237 DOI: 10.1163/1568562054414685] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The ingress of water and Kokubo simulated body fluid (SBF) into poly(2-hydroxyethyl methacrylate) (PHEMA), and its co-polymers with tetrahydrofurduryl methacrylate (THFMA), loaded with either one of two model drugs, vitamin B12 or aspirin, was studied by mass uptake over the temperature range 298-318 K. The polymers were studied as cylinders and were loaded with either 5 wt% or 10 wt% of the drugs. From DSC studies it was observed that vitamin B12 behaved as a physical cross-linker restricting chain segmental mobility, and so had a small anti-plasticisation effect on PHEMA and the co-polymers rich in HEMA, but almost no effect on the Tg of co-polymers rich in THFMA. On the other hand, aspirin exhibited a plasticising effect on PHEMA and the co-polymers. All of the polymers were found to absorb water and SBF according to a Fickian diffusion mechanism. The polymers were all found to swell to a greater extent in SBF than in water, which was attributed to the presence of Tris buffer in the SBF. The sorptions of the two penetrants were found to follow Fickian kinetics in all cases and the diffusion coefficients at 310 K for SBF were found to be smaller than those for water, except for the polymers containing aspirin where the diffusion coefficients were higher than for the other systems. For example, for sorption into PHEMA the diffusion coefficient for water was 1.41 x 10(-11) m2/s and for SBF was 0.79 x 10(-11) m2/s, but in the presence of 5 wt% aspirin the corresponding values were 1.27 x 10(-11) m2/s and 1.25 x 10(-11) m2/s, respectively. The corresponding values for PHEMA loaded with 5 wt% B12 were 1.25 x 10(-11) m2/s and 0.74 x 10(-11) m2/s, respectively.
Collapse
Affiliation(s)
- Mohammad A Chowdhury
- Polymer Materials and Radiation Group, Department of Chemistry, The University of Queensland, Brisbane, QLD 4072, Australia
| | | | | |
Collapse
|
10
|
SALIM N, SATTERTHWAITE J, RAUTEMAA R, SILIKAS N. Impregnation with antimicrobials has an impact on degree of conversion and colour stability of acrylic liner. Dent Mater J 2012. [DOI: 10.4012/dmj.2012-121] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
11
|
Supercritical fluid-mediated methods to encapsulate drugs: recent advances and new opportunities. Ther Deliv 2011; 2:1551-65. [DOI: 10.4155/tde.11.125] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
With the advent of the development of novel pharmaceutical products and therapies, there is a need for effective delivery of these products to patients. Dependent on whether they are small-molecular weight drugs or biologics, many new compounds may suffer from poor solubility, poor stability or require frequent administration and therefore require optimized delivery. For example, the utilization of polymorphism and the enhanced solubility in the amorphous state is being exploited to improve the dissolution of small-molecular weight poorly soluble drugs. This can be achieved by the formation of solid dispersions in water-soluble matrices. In addition, encapsulation in biodegradable polymeric materials is one potential route to reduce the frequency of administration through the formation of sustained-release formulations. This is desirable for biologics, for example, which generally require administration once or twice daily. Supercritical fluid processing can achieve both of these outcomes, and this review focuses on the use of supercritical CO2 to encapsulate active pharmaceutical ingredients to enhance solubility or achieve sustained release. Using supercritical CO2-mediated processes provides a clean and potentially solvent-free route to prepare novel drug products and is therefore an attractive alternative to conventional manufacturing technologies.
Collapse
|
12
|
Olmedilla MP, Lebourg M, Ivirico JLE, Nebot I, Giralt NG, Ferrer GG, Soria JM, Ribelles JLG. In vitro 3D culture of human chondrocytes using modified ε-caprolactone scaffolds with varying hydrophilicity and porosity. J Biomater Appl 2011; 27:299-309. [DOI: 10.1177/0885328211404263] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Two series of 3D scaffolds based on ε-caprolactone were synthesized. The pore size and architecture (spherical interconnected pores) was the same in all the scaffolds. In one of the series of scaffolds, made of pure ε-polycaprolactone, the volume fraction of pores varied between 60% and 85% with the main consequence of varying the interconnectivity between pores since the pore size was kept constant. The other scaffolds were prepared with copolymers made of a ε-caprolactone-based hydrophobous monomer and hydroxyethyl acrylate, as the hydrophilic component. Thus, the hydrophilicity and, presumably, the adhesion properties varied monotonously in the copolymer series while porosity was kept constant. A suspension of human chondrocytes in culture medium was injected in the 3D scaffolds and cultured in static conditions up to 28 days. SEM and immunofluorescence assays allowed characterizing cells and extracellular matrix inside the scaffolds after different culture times. To do that, cross sections of the scaffolds were observed by SEM and confocal microscopy. The quantity of cells inside the scaffolds decreases with a decrease of the volume fraction of pores, due to the lack of interconnectivity between the cavities. The scaffolds up to a 30% of hydrophilicity behave in a similar way than the hydrophobous; a further increase of the hydrophilicity rapidly decreases cell viability. In all the experiments production of collagen type I, type II, and aggrecan was found, and some cells were Ki-67 positive, showing that some cells are adhered to the pore walls and maintain their dedifferentiated phenotype even when cultured in three-dimensional conditions.
Collapse
Affiliation(s)
- Marcos Pérez Olmedilla
- Center for Biomaterials and Tissue Engineering, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain
| | - M Lebourg
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Valencia, Spain
| | - JL Escobar Ivirico
- Center for Biomaterials and Tissue Engineering, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain
| | - I Nebot
- Hospital General Universitario de Valencia. Avda Tres Cruces sn, 46614, Valencia, Spain
| | - N Garcia Giralt
- URFOA-IMIM, RETICEF, Hospital del Mar, Autonomous University of Barcelona, C/Doctor Aiguader 88, E-08003 Barcelona, Spain
| | - G Gallego Ferrer
- Center for Biomaterials and Tissue Engineering, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Valencia, Spain
- Prince Felipe Research Center, Regenerative Medicine Unit, Autopista del Saler 16, 46013 Valencia, Spain
| | - JM Soria
- Facultad Ciencias de la Salud, Universidad CEU Cardenal Herrera, Avda Seminario sn. 46113, Moncada Valencia, Spain
| | - JL Gómez Ribelles
- Center for Biomaterials and Tissue Engineering, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Valencia, Spain
- Prince Felipe Research Center, Regenerative Medicine Unit, Autopista del Saler 16, 46013 Valencia, Spain
| |
Collapse
|
13
|
Constraints to Articular Cartilage Regeneration. Regen Med 2011. [DOI: 10.1007/978-90-481-9075-1_37] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
|
14
|
Masuoka K, Asazuma T, Ishihara M, Sato M, Hattori H, Ishihara M, Yoshihara Y, Matsui T, Takase B, Kikuchi M, Nemoto K. Tissue engineering of articular cartilage using an allograft of cultured chondrocytes in a membrane-sealed atelocollagen honeycomb-shaped scaffold (ACHMS scaffold). J Biomed Mater Res B Appl Biomater 2005; 75:177-84. [PMID: 16025467 DOI: 10.1002/jbm.b.30284] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The aim of this study was to investigate with tissue engineering procedures the possibility of using atelocollagen honeycomb-shaped scaffolds sealed with a membrane (ACHMS scaffold) for the culturing of chondrocytes to repair articular cartilage defects. Chondrocytes from the articular cartilage of Japanese white rabbits were cultured in ACHMS scaffolds to allow a high-density, three-dimensional culturing for up to 21 days. Although the DNA content in the scaffold increased at a lower rate than monolayer culturing, scanning electron microscopy data showed that the scaffold was filled with grown chondrocytes and their produced extracellular matrix after 21 days. In addition, glycosaminoglycan (GAG) accumulation in the scaffold culture was at a higher level than the monolayer culture. Cultured cartilage in vitro for 14 days showed enough elasticity and stiffness to be handled in vivo. An articular cartilage defect was initiated in the patellar groove of the femur of rabbits and was subsequently filled with the chondrocyte-cultured ACHMS scaffold, ACHMS scaffold alone, or non-filled (control). Three months after the operations, histological analysis showed that only defects inserted with chondrocytes being cultured in ACHMS scaffolds were filled with reparative hyaline cartilage, and thereby highly expressing type II collagen. These results indicate that implantation of allogenic chondrocytes cultured in ACHMS scaffolds may be effective in repairing articular cartilage defects.
Collapse
Affiliation(s)
- Kazunori Masuoka
- Department of Orthopaedic Surgery, National Defense Medical College, 3-2 Namiki, Tokorozawa, Saitama 359-8513, Japan
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Barry JJA, Nazhat SN, Rose FRAJ, Hainsworth AH, Scotchford CA, Howdle SM. Supercritical carbon dioxide foaming of elastomer/heterocyclic methacrylate blends as scaffolds for tissue engineering. ACTA ACUST UNITED AC 2005. [DOI: 10.1039/b507722m] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
16
|
Barry JJA, Gidda HS, Scotchford CA, Howdle SM. Porous methacrylate scaffolds: supercritical fluid fabrication and in vitro chondrocyte responses. Biomaterials 2004; 25:3559-68. [PMID: 15020130 DOI: 10.1016/j.biomaterials.2003.10.023] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2002] [Accepted: 09/25/2003] [Indexed: 10/26/2022]
Abstract
This paper describes a method of foaming a polymer system comprising poly(ethyl methacrylate)/tetrahydrofurfuryl methacrylate (PEMA/THFMA), characterisation of the resulting porosity and use of the foam for chondrocyte culture. The potential for this polymer system to support cartilage repair has been investigated previously, both in vivo and in vitro. PEMA/THFMA foamed created using supercritical carbon dioxide were characterised using scanning electron microscopy, mercury intrusion porosimetry and helium pycnometry. Foams were found to be 82% porous with open porosities of 57%. The mean pore diameter was found to be 99+60 microm. Bovine chondrocytes seeded directly onto the surface of the foamed and unfoamed PEMA/THFMA demonstrated lower proliferation on the foamed material, greater retention of the rounded cell morphology and increased glycosaminoglycan synthesis. In conclusion, this study has shown that a porous PEMA/THFMA system can further enhance the ability of the material to support chondrocytes in vitro. However, further modifications in processing are necessary to determine optimum conditions for cartilage tissue formation.
Collapse
Affiliation(s)
- J J A Barry
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | | | | | | |
Collapse
|
17
|
Ibusuki S, Iwamoto Y, Matsuda T. System-Engineered Cartilage Using Poly(N-isopropylacrylamide)-Grafted Gelatin as in Situ-Formable Scaffold: In Vivo Performance. ACTA ACUST UNITED AC 2003; 9:1133-42. [PMID: 14670101 DOI: 10.1089/10763270360728044] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Our previous study showed that cartilaginous tissue can be engineered in vitro with articular chondrocytes and poly(N-isopropylacrylamide)-grafted gelatin. This short-term in vivo study for cartilage repair was performed to screen a candidate method for a long-term study. In our previous in vitro study, however, two potential problems with the tissue-engineered cartilage were identified: (1). leakage of the transplant due to temperature decline and (2). concave deformation of transplant due to compressive loading. To solve these problems, we investigated in this study the usefulness of suturing with two different covering materials (periosteum or collagen film) and preculturing an engineered tissue for 2 weeks. PNIPAAm-gelatin-based engineered cartilage samples were evaluated at 5 weeks after operation by gross and microscopic examination. Leakage occurred only in specimens without precultured tissue and with a collagen film. Minimal surface deformation occurred in all specimens with precultured tissue. The score on gross examination showed that transplants with precultured tissue acquired a higher score than did the others. Histological evaluation showed a minimal foreign-body response of PNIPAAm-gelatin in all specimens and higher maturity as a cartilaginous tissue in specimens with precultured tissue. These results indicate that transplantation with precultured tissue may be a suitable method for a long-term in vivo study.
Collapse
Affiliation(s)
- Shinichi Ibusuki
- Department of Biomedical Engineering, Graduate School of Medicine, Kyushu University, Fukuoka, Japan
| | | | | |
Collapse
|
18
|
Cui YL, Hou X, Qi AD, Wang XH, Wang H, Cai KY, Ji Yin Y, De Yao K. Biomimetic surface modification of poly (L-lactic acid) with gelatin and its effects on articular chondrocytes in vitro. J Biomed Mater Res A 2003; 66:770-8. [PMID: 12926028 DOI: 10.1002/jbm.a.10071] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Our objective in this study was to investigate the efficiency of two treatments for poly (L-lactic acid) (PLLA) surface modification with gelatin, via entrapment and coupling, using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) and N-hydroxysuccinimide (NHS). The properties of original PLLA, gelatin-entrapped, and coupled PLLA films were investigated by water contact angle measurement and electron spectroscopy for chemical analysis (ESCA). The water contact angle indicated that the incorporation of gelatin resulted in a change in hydrophilicity, and the ESCA data suggested that the modified PLLA films became enriched with nitrogen atoms. The cytocompatibility of modified PLLA films might be improved. Therefore, we examined the attachment and proliferation of bovine articular chondrocyte seeded on modified PLLA films and virgin films. A whole-cell enzyme-linked immunosorbent assay (cell ELISA) that detects 5-bromo-2'-deoxyuridine (BrdU) incorporation during DNA synthesis and collagen type II secretion was applied to evaluate the chondrocytes on different PLLA films and tissue culture plates (TCPS). Cell viability was estimated by the MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide] assay, and cell function was assessed by measuring glycosaminoglycan (GAG) secreted by chondrocytes. These results implied that gelatin used to modify the PLLA surface through entrapment and coupling could enhance chondrocyte adhesion, proliferation, and function.
Collapse
Affiliation(s)
- Yuan Lu Cui
- Research Institute of Polymeric Materials, Tianjin University, Tianjin 300072, People's Republic of China
| | | | | | | | | | | | | | | |
Collapse
|
19
|
Cui YL, Qi AD, Liu WG, Wang XH, Wang H, Ma DM, Yao KD. Biomimetic surface modification of poly(L-lactic acid) with chitosan and its effects on articular chondrocytes in vitro. Biomaterials 2003; 24:3859-68. [PMID: 12818559 DOI: 10.1016/s0142-9612(03)00209-6] [Citation(s) in RCA: 157] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The objective of this study was to investigate the efficiency of two treatments for poly(L-lactic acid) (PLLA) surface modification with chitosan, via entrapment and coupling by using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and N-hydroxysuccinimide. The properties of original PLLA films, chitosan-entrapped and coupled PLLA films were investigated by water contact angle measurement and electron spectroscopy for chemical analysis (ESCA). The contact angle indicated the change in hydrophilicity and the ESCA data suggested that the modified PLLA films became enriched with nitrogen atoms. The cytocompatibility of modified PLLA films might be improved. Therefore, the attachment and proliferation of bovine articular chondrocyte seeded on modified PLLA films and control one were examined. A whole cell enzyme-linked immunosorbent assay (Cell ELISA) that detects the BrdU incorporation during DNA synthesis and collagen type II secretion was applied to evaluate the chondrocytes on different PLLA films and tissue culture plates. Cell viability was estimated by the MTT assay and cell function were assessed by measuring sulfated glycosaminoglycan secreted by chondrocytes. These results implied that chitosan used to modify PLLA surface through entrapment and coupling could enhance the chondrocyte adhesion, proliferation and function.
Collapse
Affiliation(s)
- Yuan Lu Cui
- Research Institute of Polymeric Materials, Tianjin University, 300072, Tianjin, People's Republic of China
| | | | | | | | | | | | | |
Collapse
|
20
|
Bosetti M, Renò F, Bracco P, Costa L, Cannas M. Ultra-high molecular weight polyethylene oxidation reduces metalloproteinase 2 secretion in human osteoblast-like cells in vitro: a mechanism of modulation of extracellular matrix. J Biomed Mater Res A 2003; 64:698-705. [PMID: 12601782 DOI: 10.1002/jbm.a.10269] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Ultra-high molecular weight polyethylene (UHMWPE) sterilization with gamma rays induced high oxidation levels both on the surface and in the bulk that alter its structure and mechanical properties. The oxidation process of gamma-radiated UHMWPE induces a reduction of molecular weight and, consequently, a less abrasive resistance that has been related, among others, to the failure of UHMWPE in vivo. To explain the role of cells in such events, human osteoblast-like cells were seeded onto UHMWPE and oxidized UHMWPE discs. Cellular viability and morphology were evaluated along with matrix metalloproteinases (MMPs) production and activity. Oxidized UHMWPE did not induce any significant cytotoxic effects as observed by lactate dehydrogenase activity compared to the nonoxidized form; no changes in the cell morphology after 4 and 8 days proliferation were observed. In growth medium metalloproteinase 2 (gelatinase-A, MMP-2) was produced and released by osteoblast-like cells. We observed that cells grown onto oxidized UHMWPE discs decreased the release and activity of MMP-2 after 4 and 8 days culture compared to cells grown on control and non-oxidized UHMWPE discs; metalloproteinase 9 (gelatinase-B, MMP-9) release was not significantly influenced. The absence of cytotoxic and morphological effects in the presence of a down-regulation of MMP-2 release and activity suggest that oxidized polyethylene surfaces may modulate matrix remodeling and, consequently, bone formation.
Collapse
Affiliation(s)
- M Bosetti
- Department of Medical Sciences, Human Anatomy, University of Eastern Piedmont, Via Solaroli 17, 28100 Novara, Italy
| | | | | | | | | |
Collapse
|
21
|
Nettles DL, Elder SH, Gilbert JA. Potential use of chitosan as a cell scaffold material for cartilage tissue engineering. TISSUE ENGINEERING 2002; 8:1009-16. [PMID: 12542946 DOI: 10.1089/107632702320934100] [Citation(s) in RCA: 209] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
One of the most important factors in any tissue-engineering application is the cell substrate. The purpose of this study was the initial evaluation of chitosan, a derivative of the abundant, naturally occurring biopolymer chitin, as a cell scaffold for cartilage tissue engineering. Chitosan scaffolds having an interconnecting porous structure were easily fabricated by simple freezing and lyophilization of a chitosan solution. After rehydration of scaffolds, porcine chondrocytes were seeded onto scaffolds and cultured for up to 28 days in a rotating-wall bioreactor. Chitosan scaffolds supported cell attachment and maintenance of a rounded cell morphology. After 18 days, cells within the scaffolds had synthesized extracellular matrix in which proteoglycan and type II collagen were detected by toluidine blue staining and immunohistochemistry, respectively. Abundant extracellular matrix was found almost exclusively in the periphery of the scaffolds, as scaffold microstructure prevented cells from penetrating to interior regions. Nonetheless, the results suggest that chitosan scaffolds may be a useful alternative to synthetic cell scaffolds for cartilage tissue engineering.
Collapse
Affiliation(s)
- Dana L Nettles
- Department of Agricultural and Biological Engineering, Mississippi State University, Mississippi State, Mississippi, USA
| | | | | |
Collapse
|
22
|
Hunziker EB. Articular cartilage repair: basic science and clinical progress. A review of the current status and prospects. Osteoarthritis Cartilage 2002; 10:432-63. [PMID: 12056848 DOI: 10.1053/joca.2002.0801] [Citation(s) in RCA: 1334] [Impact Index Per Article: 60.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To review the basic scientific status of repair in articular cartilage tissue and to assess the efficiency of current clinical therapies instigated for the treatment of structural lesions generated therein as a result of trauma or during the course of various diseases, notably osteoarthritis (OA). Current scientific trends and possible directions for the future will also be discussed. DESIGN A systematic and critical analysis is undertaken, beginning with a description of the spontaneous repair responses in different types of lesion. Surgical interventions aimed at inducing repair without the use of active biologics will then be considered, followed by those involving active biologics and those drawing on autogenic and allogeneic tissue transplantation principles. Cell transplantation approaches, in particular novel tissue engineering concepts, will be critically presented. These will include growth-factor-based biological treatments and gene transfection protocols. A number of technical problems associated with repair interventions, such as tissue integration, tissue retention and the role of mechanical factors, will also be analysed. RESULTS A critical analysis of the literature reveals the existence of many novel and very promising biologically-based approaches for the induction of articular cartilage repair, the vast majority of which are still at an experimental phase of development. But prospective, double-blinded clinical trials comparing currently practiced surgical treatments have, unfortunately, not been undertaken. CONCLUSION The existence of many new and encouraging biological approaches to cartilage repair justifies the future investment of time and money in this research area, particularly given the extremely high socio-economic importance of such therapeutic strategies in the prevention and treatment of these common joint diseases and traumas. Clinical epidemiological and prospective trials are, moreover, urgently needed for an objective, scientific appraisal of current therapies and future novel approaches.
Collapse
Affiliation(s)
- E B Hunziker
- M.E. Müller-Institute for Biomechanics, University of Bern, Murtenstrasse 35, Switzerland.
| |
Collapse
|
23
|
Wyre RM, Downes S. The role of protein adsorption on chondrocyte adhesion to a heterocyclic methacrylate polymer system. Biomaterials 2002; 23:357-64. [PMID: 11761155 DOI: 10.1016/s0142-9612(01)00113-2] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Chondrocyte adhesion to a polymer system consisting of poly(ethyl methacrylate) and tetrahydrofurfuryl methacrylate (PEMA/THFMA) has been investigated in vitro. The adhesive glycoproteins, fibronectin and vitronectin were studied for their role in promoting cell attachment. Fibronectin was the best substrate for chondrocyte attachment, if it was pre-adsorbed and did not have to compete with other proteins for attachment sites. Chondrocytes began to spread on fibronectin coated glass although they remained rounded on the libronectin coated PEMA/THFMA system. Vitronectin was better at competing with the other proteins in serum and was the main adhesive protein for chondrocyte attachment to TCP and the PEMA/THFMA system in normal serum medium. Serum contains non-adhesive proteins that compete for binding sites and hence reduce cell attachment. The alpha5beta1 and alpha(v)beta3/beta5 integrins were detected on the chondrocytes although there may be a difference in expression between different material surfaces.
Collapse
Affiliation(s)
- R M Wyre
- School of Biomedical Sciences, Medical School, Queens Medical Centre, Nottingham, UK
| | | |
Collapse
|
24
|
Nazhat SN, Parker S, Patel MP, Braden M. Isoprene-styrene copolymer elastomer and tetrahydrofurfuryl methacrylate mixtures for soft prosthetic applications. Biomaterials 2001; 22:2411-6. [PMID: 11511038 DOI: 10.1016/s0142-9612(00)00428-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Novel elastomer/methacrylate systems have been developed for potential soft prosthetic applications. Mixtures of varying compositions of an isoprene-styrene copolymer elastomer and tetrahydrofurfuryl methacrylate (SIS/THFMA) formed one-gel systems and were heat cured with a peroxide initiator. The blends were characterised in terms of sorption in deionised water and simulated body fluids (SBF), tensile properties and viscoelastic parameters of storage modulus and tan delta, as well as glass transition temperatures using dynamic mechanical analysis (DMA). DMA data gave two distinct peaks in tan delta, a lower temperature transition due to the isoprene phase in SIS and one at high temperature thought to be a combination of THFMA and the styrene phase in SIS. The tensile data showed a clear phase inversion within the mid range compositions changing from plastic to elastomeric behaviour. The sorption studies in deionised water showed a two stage uptake with an initial Fickian region that was linear to t 1/2 followed by a droplet growth/clustering system. The slope of the linear region was dependent on the composition ratio. The extent of overall uptake was osmotically dependent as all materials equilibrated at a much lower uptake in SBF. The diffusion coefficients were found to be concentration dependent.
Collapse
Affiliation(s)
- S N Nazhat
- Interdisciplinary Research Centre in Biomedical Materials, Biomaterials in Relation to Dentistry, Queen Mary University of London, UK.
| | | | | | | |
Collapse
|
25
|
Malmonge S. Artificial Articular Cartilage: Developments and Challenges. Int J Artif Organs 2001. [DOI: 10.1177/039139880102400301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- S.M. Malmonge
- FECQ - Universidade Metodista de Piracicaba Santa Bárbara D'Oeste - Brasil
| |
Collapse
|