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Jaitli A, Roy J, Mcmahan S, Liao J, Tang L. An in vitro system to investigate IOL: Lens capsule interaction. Exp Eye Res 2021; 203:108430. [PMID: 33422509 DOI: 10.1016/j.exer.2020.108430] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Revised: 12/21/2020] [Accepted: 12/24/2020] [Indexed: 02/03/2023]
Abstract
Posterior capsule opacification (PCO) is the most common complication associated with intraocular lens (IOL) implantation. Unfortunately, current in vitro models cannot be used to assess the potential of PCO due to their failure to simulate the posterior curvature of the lens capsule (LC) and IOL, a factor known to affect PCO pathogenesis in clinic. To overcome such a challenge, a new system to study IOL: LC interaction and potentially predict PCO was developed in this effort. It is believed that the interactions between an IOL and the lens capsule may influence the extent of PCO formation. Specifically, strong adhesion force between an IOL and the LC may impede lens epithelial cell migration and proliferation and thus reduce PCO formation. To assess the adhesion force between an IOL and LC, a new in vitro model was established with simulated LC and a custom-designed micro-force tester. A method to fabricate simulated LCs was developed by imprinting IOLs onto molten gelatin to create simulated three dimensional (3D) LCs with curvature resembling the bag-like structure that collapses on the IOL post implantation. By pushing the LC mold vertically downward, while measuring the change in position of the bending bar with respect to its start position, the adhesion force between the IOLs and LCs was measured. An in vitro system that can measure the adhesion force reproducibly between an IOL and LC with a resolution of ~1 μN was established in this study. During system optimization, the 10% high molecular weight gelatin produced the best LC with the highest IOL: LC adhesion force with all test lenses that were fabricated from acrylic foldable, polymethylmethacrylate (PMMA) and silicone materials. Test IOLs exerted different adhesion force with the 3D simulated LCs in the following sequence: acrylic foldable IOL > silicone IOL > PMMA IOL. These results are in good agreement with the clinical observations associated with PCO performance of IOLs made of the same materials. This novel in vitro system can provide valuable insight on the IOL: LC interplay and its relationship to clinical PCO outcomes.
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Affiliation(s)
- Arjun Jaitli
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Joyita Roy
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Sara Mcmahan
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Jun Liao
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Liping Tang
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA.
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Gauza-Włodarczyk M, Kubisz L, Włodarczyk D. Amino acid composition in determination of collagen origin and assessment of physical factors effects. Int J Biol Macromol 2017; 104:987-991. [PMID: 28687386 DOI: 10.1016/j.ijbiomac.2017.07.013] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 06/30/2017] [Accepted: 07/03/2017] [Indexed: 11/16/2022]
Abstract
The amino acid composition of collagen is a characteristic feature of this protein. Collagen, irrespective of its origin, contains 19 amino acids, including hydroxyproline which does not occur in other proteins. Its atypical amino acid composition is characterized by high content of proline and glycine, as well as the absence of cysteine. This paper shows the comparison of qualitative composition of amino acids of fish skin (FS) collagen, bovine Achilles tendon (BAT) collagen, and bone collagen. Results demonstrate that FS collagen as well as BAT collagen contains no cysteine and significantly different amount of hydroxyproline. In BAT collagen hydroxyproline content is 30% higher than hydroxyproline content of FS collagen. In bone collagen the amount of hydroxyproline is two times more than in FS collagen. Furthermore, it is shown that sensitivity to radiation of individual amino acids varies and depends on the absorbed dose of ionizing radiation. The changes observed in the amino acid composition become very intense for the doses of 500kGy and 1000kGy.
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Affiliation(s)
- Marlena Gauza-Włodarczyk
- Department of Biophysics, Poznań University of Medical Sciences, Grunwaldzka 6, 60-780 Poznań, Poland.
| | - Leszek Kubisz
- Department of Biophysics, Poznań University of Medical Sciences, Grunwaldzka 6, 60-780 Poznań, Poland
| | - Dariusz Włodarczyk
- Department of Biophysics, Poznań University of Medical Sciences, Grunwaldzka 6, 60-780 Poznań, Poland
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Collagen scaffolds with or without the addition of RGD peptides support cardiomyogenesis after aggregation of mouse embryonic stem cells. In Vitro Cell Dev Biol Anim 2011; 47:653-64. [PMID: 21938587 DOI: 10.1007/s11626-011-9453-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2011] [Accepted: 08/29/2011] [Indexed: 01/05/2023]
Abstract
Embryonic stem (ES) cell-based cardiac muscle repair using tissue-engineered scaffolds is an attractive prospective treatment option for patients suffering from heart disease. In this study, our aim was to characterize mouse ES cell-derived cardiomyocytes growing on collagen I/III scaffolds, modified with the adhesion peptides arginine-glycine-aspartic acid (RGD). Mouse ES-derived embryoid bodies (EBs) differentiated efficiently into beating cardiomyocytes on the collagen scaffolds. QPCR analysis and immunofluorescent staining showed that cardiomyocytes expressed cardiac muscle-related transcripts and proteins. Analysis of cardiomyocytes by electron microscopy identified muscle fiber bundles and Z bands, typical of ES-derived cardiomyocytes. No differences were detected between the collagen + RGD and collagen control scaffolds. ES cells that were not differentiated as EBs prior to seeding on the scaffold, did not differentiate into cardiomyocytes. These results indicate that a collagen I/III scaffold supports cardiac muscle development and function after EB formation, and that this scaffold appears suitable for future in vivo testing. The addition of the RGD domain to the collagen scaffold did not improve cardiomyocyte development or viability, indicating that RGD signaling to integrins was not a rate-limiting event for cardiomyogenesis from EBs seeded on a collagen scaffold.
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Miskon A, Mahara A, Uyama H, Yamaoka T. A Suspension Induction for Myocardial Differentiation of Rat Mesenchymal Stem Cells on Various Extracellular Matrix Proteins. Tissue Eng Part C Methods 2010; 16:979-87. [DOI: 10.1089/ten.tec.2009.0218] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Azizi Miskon
- Department of Biomedical Engineering, Advanced Medical Engineering Center, National Cardiovascular Center Research Institute, Osaka, Japan
- Department of Chemical Engineering, Osaka University, Osaka, Japan
- Department of Electronic Engineering, Faculty of Electrical and Electronics Engineering, University Tun Hussein Onn Malaysia, Johor, Malaysia
| | - Atsushi Mahara
- Department of Biomedical Engineering, Advanced Medical Engineering Center, National Cardiovascular Center Research Institute, Osaka, Japan
| | - Hiroshi Uyama
- Department of Chemical Engineering, Osaka University, Osaka, Japan
| | - Tetsuji Yamaoka
- Department of Biomedical Engineering, Advanced Medical Engineering Center, National Cardiovascular Center Research Institute, Osaka, Japan
- JST, CREST, Tokyo, Japan
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Beating behavior of primary neonatal cardiomyocytes and cardiac-differentiated P19.CL6 cells on different extracellular matrix components. J Artif Organs 2009; 12:111-7. [DOI: 10.1007/s10047-009-0449-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2008] [Accepted: 01/14/2009] [Indexed: 10/20/2022]
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Hiltner A, Anderson JM, Baer E. Dynamic mechanical analysis of poly-α-amino acids. Models for collagen. J MACROMOL SCI B 2006. [DOI: 10.1080/00222347308201630] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Anne Hiltner
- a Department of Macromolecular Science , Case Western Reserve University , Cleveland , Ohio
| | - James M. Anderson
- a Department of Macromolecular Science , Case Western Reserve University , Cleveland , Ohio
| | - Eric Baer
- a Department of Macromolecular Science , Case Western Reserve University , Cleveland , Ohio
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Mano JF. Viscoelastic properties of bone: Mechanical spectroscopy studies on a chicken model. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2005. [DOI: 10.1016/j.msec.2005.01.017] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Samouillan V, Lamure A, Maurel E, Dandurand J, Lacabanne C, Spina M. Dielectric characterization of collagen, elastin, and aortic valves in the low temperature range. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2001; 11:583-98. [PMID: 10981675 DOI: 10.1163/156856200743887] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The low temperature dielectric relaxation of porcine aortic valves and its main macromolecular proteins. i.e. elastin and collagen, have been investigated in the dry state and at low levels of hydration by thermally stimulated currents spectrometry, with an equivalent frequency of 10(-3) Hz. Two secondary relaxation modes, labeled gamma and beta with increasing temperature, are found for the three materials. Since the gamma-mode is independent upon hydration while the beta-mode is strongly plasticized by water, these relaxation modes have been attributed to localized motions of the polypeptidic chains containing apolar and polar residues, respectively. The deconvolution of the beta-mode by fractional polarization gives the experimental distribution of the dielectric relaxation times of the three materials, and allows us to deduce the activation parameters of each elementary process. These analyses shows the existence of compensation phenomena between the activation parameters, implying cooperative mechanisms. The occurrence of these phenomena with their characteristic parameters are used to specify the origin of the localized relaxation modes in collagen and elastin, and to assign the specific role of each protein in the aortic valves.
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Affiliation(s)
- V Samouillan
- Laboratoire de Physique des Polymères, Université Paul Sabatier, Toulouse, France
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Sasaki N, Shukunami N, Matsushima N, Izumi Y. Time-resolved X-ray diffraction from tendon collagen during creep using synchrotron radiation. J Biomech 1999; 32:285-92. [PMID: 10093028 DOI: 10.1016/s0021-9290(98)00174-2] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
In order to understand the molecular mechanism of relaxation phenomena in collagenous tissue, time-resolved, small-angle X-ray diffraction measurements were performed on bovine Achilles tendon collagen under creep. A tension-induced increase in the 67 nm period (D-period) was observed, and the strain in the D-period, epsilon D, was found to be almost proportional to the external force per unit cross-sectional area (average stress) of the specimen. With an increase in epsilon D, a change in the ratio of intensities of the third-order reflection peak of the D-period to that of the second-order peak was also observed. The increase in epsilon D was decomposed into three elementary processes of D-period deformation, which are presented on the basis of the Hodge-Petruska model: (1) molecular elongation, (2) increase in gap region, and (3) relative slippage of lateral adjoining molecules. Up to 8 MPa of average stress, the contribution to epsilon D originated mostly from only mode (1). At more than 10 MPa of average stress, modes (2) and (3) also contributed to fibril elongation. For epsilon D by molecular elongation (mode (1)), the time dependence of the D-period change in the immediate response region is a sharply shaped step function, while the contribution to epsilon D by molecular rearranging modes gives a slight creep nature at the immediate response region in the time dependence of epsilon D. Because this creep nature is observed at the immediate response, it is related qualitatively to the KWW function in a stress-relaxation modulus of collagenous tissue observed in an immediate response region (Sasaki et al. (1993). Journal of Biomechanics 26, 1369-1376). The elementary process of KWW-type relaxation is concluded to be related to the tension-induced molecular rearrangement within a D-period.
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Affiliation(s)
- N Sasaki
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo, Japan.
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Sebag J. Structure, function, and age-related changes of the human vitreous. BULLETIN DE LA SOCIETE BELGE D'OPHTALMOLOGIE 1987; 223 Pt 1:37-57. [PMID: 3307969 DOI: 10.1007/978-1-4757-1901-7_3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Maeda H, Fukada E. Effect of water on piezoelectric, dielectric, and elastic properties of bone. Biopolymers 1982; 21:2055-68. [PMID: 7171727 DOI: 10.1002/bip.360211010] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Fenton M, Hiltner A. Interaction of water with poly-?-amino acids. II. Relationships between counter-ion and relaxation processes. Biopolymers 1978. [DOI: 10.1002/bip.1978.360171003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Froix MF, Pochan J, Goedde A, Hinman D. A dynamic characterization via relaxation techniques of the shell membranes of the domesticated fowl (gallus/gallus (L.)). POLYMER 1977. [DOI: 10.1016/0032-3861(77)90281-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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17
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Nagamura T, Woodward AE. Investigation of molecular motion in collagen using the spin-probe technique. Biopolymers 1977; 16:907-19. [PMID: 192358 DOI: 10.1002/bip.1977.360160413] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Abstract
1. The responses to stretch have been studied in living, isolated Golgi tendon organs (GTOs) from tail muscles of cat. Experiments were performed in vitro and consisted of subjecting single GTOs to controlled ramp-and-hold stretch while recording the response from their sensory axons raised in oil. 2. The threshold force required for sustained afferent discharge was measured directly, and found to be between 8 and 170 dynes at 24 degrees C for nine GTOs tested. Beyond threshold, the discharge frequency is approximately proportional to applied static tension over a wide range. Sensitivy to tension varies among different GTOs and appears to be inversely correlated with mechanical stiffness. 3. With impulse activity blocked by tetrodotoxin, graded receptor potentials could be recorded whose amplitude varied in proportion to applied static tension. All GTOs examined showed in addition a dynamic response, which became larger with increasing velocity of ramp stretch. This dynamic sensitivity appears in the receptor potential and is then augmentd by an apparent accommodative process at the impulse initiating site. 4. Based on the above findings, possible mechanical models are discussed for the sensory transduction mechanism.
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Broom ND. The stress/strain and fatigue behaviour of glutaraldehyde preserved heart-valve tissue. J Biomech 1977; 10:707-24. [PMID: 415062 DOI: 10.1016/0021-9290(77)90086-0] [Citation(s) in RCA: 81] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Abstract
Two piezoelectric constants (polarization per unit stress, d=d'-id'', and polarization per unit strain, e=e'-ie''), the elastic constant, and dielectric constant are determined for oriented collagen at different hydration levels at 10 Hz from -150 to 50 degrees C. With no hydration (approximately 0% H2O), d' increases slightly with higher temperatures, while e' decreases slightly. Near 11 wt% H2O, both d' and e' increase then decrease around 0 degrees C, and is probably caused by an increase of the dielectric constant and the ionic conductivity in the nonpiezoelectric phase. Hydration greater than 25 wt%, d' and e' decrease above -50 degrees C which is considered to be due to a greater ionic conductivity surrounding the piezoelectric phase.
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Pezzin G, Scandola M, Gotte L. The low-temperature mechenical relaxation of elastin. I. The dry protein. Biopolymers 1976; 15:283-92. [PMID: 1247656 DOI: 10.1002/bip.1976.360150206] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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25
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Hiltner A, Baer E. Mechanical properties of polymers at cryogenic temperatures: relationships between relaxation, yield and fracture processes. POLYMER 1974. [DOI: 10.1016/0032-3861(74)90142-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Tanioka A, Tazawa T, Miyasaka K, Ishikawa K. Effects of water on the mechanical properties of gelatin films. Biopolymers 1974; 13:753-64. [PMID: 4847585 DOI: 10.1002/bip.1974.360130410] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Chien JC, Chang EP. Influence of telopeptide on the morphology and physicomechanical properties of reconstituted collagens. Biopolymers 1973; 12:2044-55. [PMID: 4744751 DOI: 10.1002/bip.1973.360120911] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Abstract
The dynamic mechanical properties of purified collagen from bovine tendon were studied using a torsion pendulum in the temperature range of 120 degrees -360 degrees K at 0.3-1 cps. In the temperature range studied, two loss peaks were observed: a beta-peak at about 200 degrees K, and an alpha-peak approximately five times larger at about 280 degrees K. The temperature of the alpha-transition is shown to be dependent on water content, decreasing with increasing amount of water and shifting to lower temperatures. Broad-line proton magnetic resonance results were also obtained on similar samples. A narrow nuclear magnetic resonance (NMR) line appears at about 250 degrees C. The effects of shrinkage to form gelatin and of cross-linking on the relaxation behavior of collagen were also studied. The motions taking place in collagen over the 120 degrees -360 degrees K range are discussed.
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