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Apostolidou CP, Kokotidou C, Platania V, Nikolaou V, Landrou G, Nikoloudakis E, Charalambidis G, Chatzinikolaidou M, Coutsolelos AG, Mitraki A. Antimicrobial Potency of Fmoc-Phe-Phe Dipeptide Hydrogels with Encapsulated Porphyrin Chromophores Is a Promising Alternative in Antimicrobial Resistance. Biomolecules 2024; 14:226. [PMID: 38397463 PMCID: PMC10887087 DOI: 10.3390/biom14020226] [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: 12/11/2023] [Revised: 01/29/2024] [Accepted: 02/11/2024] [Indexed: 02/25/2024] Open
Abstract
Antimicrobial resistance (AMR) poses a significant global health risk as a consequence of misuse of antibiotics. Owing to the increasing antimicrobial resistance, it became imperative to develop novel molecules and materials with antimicrobial properties. Porphyrins and metalloporphyrins are compounds which present antimicrobial properties especially after irradiation. As a consequence, porphyrinoids have recently been utilized as antimicrobial agents in antimicrobial photodynamic inactivation in bacteria and other microorganisms. Herein, we report the encapsulation of porphyrins into peptide hydrogels which serve as delivery vehicles. We selected the self-assembling Fmoc-Phe-Phe dipeptide, a potent gelator, as a scaffold due to its previously reported biocompatibility and three different water-soluble porphyrins as photosensitizers. We evaluated the structural, mechanical and in vitro degradation properties of these hydrogels, their interaction with NIH3T3 mouse skin fibroblasts, and we assessed their antimicrobial efficacy against Gram-positive Staphylococcus aureus (S. aureus) and Gram-negative Escherichia coli (E. coli) bacteria. We found out that the hydrogels are cytocompatible and display antimicrobial efficiency against both strains with the zinc porphyrins being more efficient. Therefore, these hydrogels present a promising alternative for combating bacterial infections in the face of growing AMR concerns.
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Affiliation(s)
- Chrysanthi Pinelopi Apostolidou
- Department of Materials Science and Technology, University of Crete, Voutes Campus, 71003 Heraklion, Greece; (C.P.A.); (C.K.); (V.P.)
- Institute of Electronic Structure and Laser (IESL) FORTH, 70013 Heraklion, Greece
| | - Chrysoula Kokotidou
- Department of Materials Science and Technology, University of Crete, Voutes Campus, 71003 Heraklion, Greece; (C.P.A.); (C.K.); (V.P.)
- Institute of Electronic Structure and Laser (IESL) FORTH, 70013 Heraklion, Greece
| | - Varvara Platania
- Department of Materials Science and Technology, University of Crete, Voutes Campus, 71003 Heraklion, Greece; (C.P.A.); (C.K.); (V.P.)
- Institute of Electronic Structure and Laser (IESL) FORTH, 70013 Heraklion, Greece
| | - Vasilis Nikolaou
- Laboratory of Bioinorganic Chemistry, Department of Chemistry, University of Crete, Voutes Campus, 70013 Heraklion, Greece (G.L.); (E.N.); (G.C.)
| | - Georgios Landrou
- Laboratory of Bioinorganic Chemistry, Department of Chemistry, University of Crete, Voutes Campus, 70013 Heraklion, Greece (G.L.); (E.N.); (G.C.)
| | - Emmanouil Nikoloudakis
- Laboratory of Bioinorganic Chemistry, Department of Chemistry, University of Crete, Voutes Campus, 70013 Heraklion, Greece (G.L.); (E.N.); (G.C.)
| | - Georgios Charalambidis
- Laboratory of Bioinorganic Chemistry, Department of Chemistry, University of Crete, Voutes Campus, 70013 Heraklion, Greece (G.L.); (E.N.); (G.C.)
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Ave., 11635 Athens, Greece
| | - Maria Chatzinikolaidou
- Department of Materials Science and Technology, University of Crete, Voutes Campus, 71003 Heraklion, Greece; (C.P.A.); (C.K.); (V.P.)
- Institute of Electronic Structure and Laser (IESL) FORTH, 70013 Heraklion, Greece
| | - Athanassios G. Coutsolelos
- Institute of Electronic Structure and Laser (IESL) FORTH, 70013 Heraklion, Greece
- Laboratory of Bioinorganic Chemistry, Department of Chemistry, University of Crete, Voutes Campus, 70013 Heraklion, Greece (G.L.); (E.N.); (G.C.)
| | - Anna Mitraki
- Department of Materials Science and Technology, University of Crete, Voutes Campus, 71003 Heraklion, Greece; (C.P.A.); (C.K.); (V.P.)
- Institute of Electronic Structure and Laser (IESL) FORTH, 70013 Heraklion, Greece
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2
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Qiu R, Cai K, Zhang K, Ying Y, Hu H, Jiang G, Luo K. The current status and development trend of hydrogel application in spinal surgery. J Mater Chem B 2024; 12:1730-1747. [PMID: 38294330 DOI: 10.1039/d3tb02613b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2024]
Abstract
Spinal diseases often result in compromised mobility and diminished quality of life due to the intricate anatomy surrounding the nervous system. Medication and surgical interventions remain the primary treatment methods for spinal conditions. However, currently available medications have limited efficacy in treating spinal surgical diseases and cannot achieve a complete cure. Furthermore, surgical intervention frequently results in inevitable alterations and impairments to the initial anatomical integrity of the spinal structure, accompanied by the consequential loss of certain physiological functionalities. Changes in spine surgery treatment concepts and modalities in the last decade have led to a deepening of minimally invasive treatment, with treatment strategies focusing more on repairing and reconstructing the patient's spine and preserving physiological functions. Therefore, developing novel and more efficient treatment strategies to reduce spinal lesions and iatrogenic injuries is essential. In recent years, significant advancements in biomedical research have led to the discovery that hydrogels possess excellent biocompatibility, biodegradability, and adjustable mechanical properties. The application of hydrogel-based biotechnology in spinal surgery has demonstrated remarkable therapeutic potential. This review presents the therapeutic strategies for spinal diseases based on hydrogel tissue engineering technology.
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Affiliation(s)
- Rongzhang Qiu
- Health Science Center, Ningbo University, Ningbo, Zhejiang, 315000, China
| | - Kaiwen Cai
- Department of Orthopaedics, The First Affiliated Hospital of Ningbo University, Ningbo, Zhejiang, 315000, China.
| | - Kai Zhang
- Department of Orthopaedics, The First Affiliated Hospital of Ningbo University, Ningbo, Zhejiang, 315000, China.
| | - Yijian Ying
- Health Science Center, Ningbo University, Ningbo, Zhejiang, 315000, China
| | - Hangtian Hu
- Health Science Center, Ningbo University, Ningbo, Zhejiang, 315000, China
| | - Guoqiang Jiang
- Department of Orthopaedics, The First Affiliated Hospital of Ningbo University, Ningbo, Zhejiang, 315000, China.
| | - Kefeng Luo
- Department of Orthopaedics, The First Affiliated Hospital of Ningbo University, Ningbo, Zhejiang, 315000, China.
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3
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Mineart KP, Vallely MJ, Rankin LA, Hill DM, Lee B. Implications of styrenic triblock copolymer gel mechanics on midblock bridging fraction. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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4
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Elastomer–Hydrogel Systems: From Bio-Inspired Interfaces to Medical Applications. Polymers (Basel) 2022; 14:polym14091822. [PMID: 35566990 PMCID: PMC9104885 DOI: 10.3390/polym14091822] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2022] [Revised: 04/13/2022] [Accepted: 04/27/2022] [Indexed: 12/10/2022] Open
Abstract
Novel advanced biomaterials have recently gained great attention, especially in minimally invasive surgical techniques. By applying sophisticated design and engineering methods, various elastomer–hydrogel systems (EHS) with outstanding performance have been developed in the last decades. These systems composed of elastomers and hydrogels are very attractive due to their high biocompatibility, injectability, controlled porosity and often antimicrobial properties. Moreover, their elastomeric properties and bioadhesiveness are making them suitable for soft tissue engineering. Herein, we present the advances in the current state-of-the-art design principles and strategies for strong interface formation inspired by nature (bio-inspiration), the diverse properties and applications of elastomer–hydrogel systems in different medical fields, in particular, in tissue engineering. The functionalities of these systems, including adhesive properties, injectability, antimicrobial properties and degradability, applicable to tissue engineering will be discussed in a context of future efforts towards the development of advanced biomaterials.
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5
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Study of the Influence of the Manufacturing Parameters on Tensile Properties of Thermoplastic Elastomers. Polymers (Basel) 2022; 14:polym14030576. [PMID: 35160565 PMCID: PMC8838108 DOI: 10.3390/polym14030576] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 01/27/2022] [Accepted: 01/28/2022] [Indexed: 02/01/2023] Open
Abstract
Additive manufacturing (AM) has increased its field of application, not only for prototypes but also for final parts. Therefore, the need to study new materials is currently growing. This paper aims to study the effect of the printing parameters used in two different thermoplastic elastomers (PEBA 90A and TPU 98A) subjected to tensile tests, evaluating a competent alternative to the currently most used 3D printed materials. To achieve it, a full factorial design experiment is applied to analyze the influence on the tensile responses of two printing parameters: the layer height and the fill density. In addition, an analysis of variance (ANOVA) is used to describe the relations among the parameters and the mechanical responses obtained. Moreover, assessment of damping properties was done. Results show that each thermoplastic elastomer should be studied separately, although the proposed methodology can be used for each material independently of their nature. Finally, a correlation between the printing parameters and the mechanical behavior of TPU 98A and PEBA 90A was found: the layer height and the infill are statistically influential parameters for both materials.
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6
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Schiavi A, Cuccaro R, Troia A. Functional mechanical attributes of natural and synthetic gel-based scaffolds in tissue engineering: strain-stiffening effects on apparent elastic modulus and compressive toughness. J Mech Behav Biomed Mater 2022; 126:105066. [PMID: 35008012 DOI: 10.1016/j.jmbbm.2021.105066] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 12/14/2021] [Accepted: 12/24/2021] [Indexed: 12/18/2022]
Abstract
The accurate identification and determination of elastic modulus and toughness, as well as other functional mechanical attributes of artificial tissues, are of paramount importance in several fields of tissue science, tissue engineering and technology, since biomechanical and biophysical behavior is strongly linked to biological features of the medical implants and tissue-engineering scaffolds. When soft or ultra-soft materials are investigated, a relevant dispersion of elastic modulus values can be achieved, due to the strain-stiffening effects, inducing a typical non-linear behavior of these materials, as a function of strain-range. In this short communication, the Apparent elastic modulus strain-range dependence is estimated from a segmentation of the strain stiffening curve, and the related compressive toughness is investigated and discussed, based on experimental evidence, for 6 different kinds of gels, used for artificial tissue fabrication; experimental results are compared to mechanical properties of native human tissues.
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Affiliation(s)
- Alessandro Schiavi
- INRiM - Istituto Nazionale di Ricerca Metrologica, Strada Delle Cacce 91, 10135, Torino, Italy.
| | - Rugiada Cuccaro
- INRiM - Istituto Nazionale di Ricerca Metrologica, Strada Delle Cacce 91, 10135, Torino, Italy.
| | - Adriano Troia
- INRiM - Istituto Nazionale di Ricerca Metrologica, Strada Delle Cacce 91, 10135, Torino, Italy.
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7
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Liu J, Wang D, Li Y, Zhou Z, Zhang D, Li J, Chu H. Overall Structure Construction of an Intervertebral Disk Based on Highly Anisotropic Wood Hydrogel Composite Materials with Mechanical Matching and Buckling Buffering. ACS APPLIED MATERIALS & INTERFACES 2021; 13:15709-15719. [PMID: 33755430 DOI: 10.1021/acsami.1c02487] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Natural intervertebral disks (IVDs) exhibit distinctive anisotropic mechanical support and dissipation performances due to their well-developed special microstructures. As the intact IVD structure degrades, the absence of function will lead to severe backache. However, the complete simulation for the characteristic structure and function of native IVD is unattainable using current methods. In this work, by overall construction of the two-phase structure of native IVD (extraction of the naturally aligned cellulose framework and in situ polymerization of the nanocomposite hydrogel), a complete wood framework IVD (WF-IVD) is manufactured containing elastic nanocomposite hydrogel-based nucleus pulposus (NP) and anisotropic wood cellulose hydrogel-based annulus fibrosus (AF). In addition to the imitation and construction of the natural structure, WF-IVD also achieves favorable mechanical matching and good biocompatibility and possesses unique mechanical buckling buffer characteristics owing to the aligned fiber bundles. This study offers a promising strategy for the mimicking and construction of complex native tissues.
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Affiliation(s)
- Jinming Liu
- College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China
| | - Dingqian Wang
- College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China
| | - Yanyan Li
- College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China
| | - Ziqi Zhou
- College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China
| | - Dongyue Zhang
- College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China
- State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China
| | - Jianshu Li
- College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China
- State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China
| | - Hetao Chu
- College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China
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8
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Zheng K, Du D. Recent advances of hydrogel-based biomaterials for intervertebral disc tissue treatment: A literature review. J Tissue Eng Regen Med 2021; 15:299-321. [PMID: 33660950 DOI: 10.1002/term.3172] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 12/23/2020] [Indexed: 12/14/2022]
Abstract
Low back pain is an increasingly prevalent symptom mainly associated with intervertebral disc (IVD) degeneration. It is highly correlated with aging, as the nucleus pulposus (NP) dehydrates and annulus fibrosus fissure formatting, which finally results in the IVD herniation and related clinical symptoms. Hydrogels have been drawing increasing attention as the ideal candidates for IVD degeneration because of their unique properties such as biocompatibility, highly tunable mechanical properties, and especially the water absorption and retention ability resembling the normal NP tissue. Numerous innovative hydrogel polymers have been generated in the most recent years. This review article will first briefly describe the anatomy and pathophysiology of IVDs and current therapies with their limitations. Following that, the article introduces the hydrogel materials in the classification of their origins. Next, it reviews the recent hydrogel polymers explored for IVD regeneration and analyses what efforts have been made to overcome the existing limitations. Finally, the challenges and prospects of hydrogel-based treatments for IVD tissue are also discussed. We believe that these novel hydrogel-based strategies may shed light on new possibilities in IVD degeneration disease.
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Affiliation(s)
- Kaiwen Zheng
- Department of Orthopedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China
| | - Dajiang Du
- Department of Orthopedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China
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9
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Zhang X, Liang X, Huang Q, Zhang H, Liu C, Liu Y. Equipment-free photothermal effect promoted self-healing and self-recovery of hydrogels. SOFT MATTER 2020; 16:9833-9837. [PMID: 33107546 DOI: 10.1039/d0sm01521k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The self-healing and self-recovery of the hydrogel materials can be promoted under sunlight without the assistance of electrical equipment by adding a light-to-heat conversion substance during the synthetic process, which will greatly extend the service life of the hydrogels even for the elastomer materials in the off-grid areas.
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Affiliation(s)
- Xinjie Zhang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518055, China.
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10
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Rankin LA, Lee B, Mineart KP. Effect of network connectivity on the mechanical and transport properties of block copolymer gels. JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1002/pol.20200695] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Lucas A. Rankin
- Department of Chemical Engineering Bucknell University Lewisburg Pennsylvania USA
| | - Byeongdu Lee
- X‐Ray Science Division Argonne National Laboratory Lemont Illinois USA
| | - Kenneth P. Mineart
- Department of Chemical Engineering Bucknell University Lewisburg Pennsylvania USA
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11
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Drozdov AD, Christiansen JD. Tension-compression asymmetry in the mechanical response of hydrogels. J Mech Behav Biomed Mater 2020; 110:103851. [PMID: 32957177 DOI: 10.1016/j.jmbbm.2020.103851] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 04/03/2020] [Accepted: 05/05/2020] [Indexed: 12/14/2022]
Abstract
Two factors play the key role in application of hydrogels as biomedical implants (for example, for replacement of damaged intervertebral discs and repair of spinal cord injuries): their stiffness and strength (measured in tensile tests) and mechanical integrity (estimated under uniaxial compression). Observations show a pronounced difference between the responses of hydrogels under tension and compression (the Young's moduli can differ by two orders of magnitude), which is conventionally referred to as the tension-compression asymmetry (TCA). A constitutive model is developed for the mechanical behavior of hydrogels, where TCA is described within the viscoplasticity theory (plastic flow is treated as sliding of junctions between chains with respect to their reference positions). The governing equations involve five material constants with transparent physical meaning. These quantities are found by fitting stress-strain diagrams under tension and compression on a number of pristine and nanocomposite hydrogels with various kinds of chemical and physical bonds between chains. Good agreement is demonstrated between the experimental data and results of simulation. The influence of volume fraction of nanoparticles, concentration of cross-links, and topology of a polymer network on material parameters is analyzed numerically.
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Affiliation(s)
- A D Drozdov
- Department of Materials and Production, Aalborg University, Fibigerstraede 16, Aalborg, 9220, Denmark.
| | - J deC Christiansen
- Department of Materials and Production, Aalborg University, Fibigerstraede 16, Aalborg, 9220, Denmark
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12
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Altuna FI, Casado U, dell'Erba IE, Luna L, Hoppe CE, Williams RJJ. Epoxy vitrimers incorporating physical crosslinks produced by self-association of alkyl chains. Polym Chem 2020. [DOI: 10.1039/c9py01787a] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Vitrimers synthesized from epoxy-carboxylic acid-alkylamine (Cn) formulations exhibit tunable mechanical properties and stress relaxation without using external catalysts.
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Affiliation(s)
- F. I. Altuna
- Institute of Materials Science and Technology (INTEMA)
- University of Mar del Plata and National Research Council (CONICET)
- 7600 Mar del Plata
- Argentina
| | - U. Casado
- Institute of Materials Science and Technology (INTEMA)
- University of Mar del Plata and National Research Council (CONICET)
- 7600 Mar del Plata
- Argentina
| | - I. E. dell'Erba
- Institute of Materials Science and Technology (INTEMA)
- University of Mar del Plata and National Research Council (CONICET)
- 7600 Mar del Plata
- Argentina
| | - L. Luna
- Institute of Materials Science and Technology (INTEMA)
- University of Mar del Plata and National Research Council (CONICET)
- 7600 Mar del Plata
- Argentina
| | - C. E. Hoppe
- Institute of Materials Science and Technology (INTEMA)
- University of Mar del Plata and National Research Council (CONICET)
- 7600 Mar del Plata
- Argentina
| | - R. J. J. Williams
- Institute of Materials Science and Technology (INTEMA)
- University of Mar del Plata and National Research Council (CONICET)
- 7600 Mar del Plata
- Argentina
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13
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Orozco GA, Tanska P, Florea C, Grodzinsky AJ, Korhonen RK. A novel mechanobiological model can predict how physiologically relevant dynamic loading causes proteoglycan loss in mechanically injured articular cartilage. Sci Rep 2018; 8:15599. [PMID: 30348953 PMCID: PMC6197240 DOI: 10.1038/s41598-018-33759-3] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Accepted: 10/02/2018] [Indexed: 12/13/2022] Open
Abstract
Cartilage provides low-friction properties and plays an essential role in diarthrodial joints. A hydrated ground substance composed mainly of proteoglycans (PGs) and a fibrillar collagen network are the main constituents of cartilage. Unfortunately, traumatic joint loading can destroy this complex structure and produce lesions in tissue, leading later to changes in tissue composition and, ultimately, to post-traumatic osteoarthritis (PTOA). Consequently, the fixed charge density (FCD) of PGs may decrease near the lesion. However, the underlying mechanisms leading to these tissue changes are unknown. Here, knee cartilage disks from bovine calves were injuriously compressed, followed by a physiologically relevant dynamic compression for twelve days. FCD content at different follow-up time points was assessed using digital densitometry. A novel cartilage degeneration model was developed by implementing deviatoric and maximum shear strain, as well as fluid velocity controlled algorithms to simulate the FCD loss as a function of time. Predicted loss of FCD was quite uniform around the cartilage lesions when the degeneration algorithm was driven by the fluid velocity, while the deviatoric and shear strain driven mechanisms exhibited slightly discontinuous FCD loss around cracks. Our degeneration algorithm predictions fitted well with the FCD content measured from the experiments. The developed model could subsequently be applied for prediction of FCD depletion around different cartilage lesions and for suggesting optimal rehabilitation protocols.
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Affiliation(s)
- Gustavo A Orozco
- Department of Applied Physics, University of Eastern Finland, Kuopio, Finland.
| | - Petri Tanska
- Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
| | - Cristina Florea
- Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
- Departments of Biological Engineering, Electrical Engineering and Computer Science and Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Alan J Grodzinsky
- Departments of Biological Engineering, Electrical Engineering and Computer Science and Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Rami K Korhonen
- Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
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14
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Lewis JT, Fischenich KM, Haut Donahue TL, Bailey TS. Nanostructure-Driven Replication of Soft Tissue Biomechanics in a Thermoplastic Elastomer Hydrogel. ACS Biomater Sci Eng 2018; 4:3854-3863. [DOI: 10.1021/acsbiomaterials.8b00929] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Jackson T. Lewis
- School of Biomedical Engineering, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Kristine M. Fischenich
- School of Biomedical Engineering, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Tammy L. Haut Donahue
- Department of Biomedical Engineering, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Travis S. Bailey
- School of Biomedical Engineering, Colorado State University, Fort Collins, Colorado 80523, United States
- Department of Chemical and Biological Engineering, Colorado State University, Fort Collins, Colorado 80523, United States
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15
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Huq NA, Bailey TS. Spatial Control of Mechanical Properties and Surface Topography in a Photoreactive Block Copolymer Hydrogel. Macromolecules 2018. [DOI: 10.1021/acs.macromol.7b02247] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nabila A. Huq
- Department of Chemical and Biological Engineering, Colorado State University, Fort Collins, Colorado 80521, United States
| | - Travis S. Bailey
- Department of Chemical and Biological Engineering, Colorado State University, Fort Collins, Colorado 80521, United States
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16
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Drozdov AD, deClaville Christiansen J. Double-network gels with dynamic bonds under multi-cycle deformation. J Mech Behav Biomed Mater 2018; 88:58-68. [PMID: 30125788 DOI: 10.1016/j.jmbbm.2018.08.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 06/14/2018] [Accepted: 08/01/2018] [Indexed: 12/31/2022]
Abstract
Application of double-network (DN) gels with dynamic bonds as implants for repair of damaged and degenerate cartilage tissue and their use as synthetic non-degradable scaffolds for growth, proliferation and differentiation of stem cells requires understanding of the mechanical behavior of these materials under cyclic deformation. A constitutive model is developed for the viscoelastic and viscoplastic responses of DN gels with covalent and non-covalent junctions under multi-cycle loading. Viscoelasticity is treated as breakage and reformation of temporary junctions driven by thermal fluctuations. Viscoplasticity is thought of as sliding of permanent junctions with respect to their initial positions in the polymer network. Adjustable parameters in the governing equations are found by fitting observations in tensile loading-unloading tests with various maximum strains and multi-cycle tests with monotonically increasing maximum elongation ratios per cycle on two DN gels with physical junctions formed due to hydrogen bonds and ionic complexation. Numerical analysis demonstrates the ability of the model not only to describe observations correctly, but also to predict the mechanical response in multi-cycle tests with sophisticated deformation programs. Quantitative and qualitative effects of metal-coordination bonds on the mechanical behavior of supramolecular gels are revealed by simulation.
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Affiliation(s)
- A D Drozdov
- Department of Materials and Production, Aalborg University, Fibigerstraede 16, Aalborg 9220, Denmark.
| | - J deClaville Christiansen
- Department of Materials and Production, Aalborg University, Fibigerstraede 16, Aalborg 9220, Denmark
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17
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A Hydrogel Meniscal Replacement: Knee Joint Pressure and Distribution in an Ovine Model Compared to Native Tissue. Ann Biomed Eng 2018; 46:1785-1796. [PMID: 29922953 DOI: 10.1007/s10439-018-2069-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Accepted: 06/06/2018] [Indexed: 10/28/2022]
Abstract
Pressure distribution of the native ovine knee meniscus was compared to a medial meniscectomy and three treatment conditions including a suture reattachment of the native tissue, an allograft, and a novel thermoplastic elastomer hydrogel (TPE) construct. The objective of this study was to assess the efficacy of a novel TPE hydrogel construct at restoring joint pressure and distribution. Limbs were loaded in uniaxial compression at 45°, 60°, and 75° flexion and from 0 to 181 kg. The medial meniscectomy decreased contact area by approximately 50% and doubled the mean and maximum pressure reading for the medial hemijoint. No treatment condition tested within this study was able to fully restore medial joint contact area and pressures to the native condition. A decrease in lateral contact area and increase in pressures with the meniscectomy was also seen; and to some degree, all reattachment and replacement conditions including the novel TPE hydrogel replacement helped to restore lateral pressures. Although the TPE construct did not perform as well as hoped in the medial compartment, it performed as well as, if not better, than the other reattachment and replacement options in the lateral. Further work is necessary to determine the best anchoring and attachment methods.
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