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Tidu A, Ghoubay-Benallaoua D, Lynch B, Haye B, Illoul C, Allain JM, Borderie VM, Mosser G. Development of human corneal epithelium on organized fibrillated transparent collagen matrices synthesized at high concentration. Acta Biomater 2015; 22:50-8. [PMID: 25931016 DOI: 10.1016/j.actbio.2015.04.018] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2014] [Revised: 03/06/2015] [Accepted: 04/14/2015] [Indexed: 12/13/2022]
Abstract
Several diseases can lead to opacification of cornea requiring transplantation of donor tissue to restore vision. In this context, transparent collagen I fibrillated matrices have been synthesized at 15, 30, 60 and 90 mg/mL. The matrices were evaluated for fibril organizations, transparency, mechanical properties and ability to support corneal epithelial cell culture. The best results were obtained with 90 mg/mL scaffolds. At this concentration, the fibril organization presented some similarities to that found in corneal stroma. Matrices had a mean Young's modulus of 570 kPa and acellular scaffolds had a transparency of 87% in the 380-780 nm wavelength range. Human corneal epithelial cells successfully colonized the surface of the scaffolds and generated an epithelium with characteristics of corneal epithelial cells (i.e. expression of cytokeratin 3 and presence of desmosomes) and maintenance of stemness during culture (i.e. expression of ΔNp63α and formation of holoclones in colony formation assay). Presence of cultured epithelium on the matrices was associated with increased transparency (89%).
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Affiliation(s)
- Aurélien Tidu
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, UMR 7574, Chimie de la Matière Condensée de Paris, F-75005 Paris, France
| | - Djida Ghoubay-Benallaoua
- Sorbonne Universités, UPMC Univ Paris 06, UMR_S 968, Institut de la Vision, Paris F75012, France; INSERM, U968, Paris F75012, France; CNRS, UMR_7210, Paris F75012, France; Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts, DHU View Maintain, INSERM-DHOS CIC 1423, Paris F-75012, France
| | - Barbara Lynch
- Solids Mechanics Laboratory, Ecole Polytechnique, Centre National de la Recherche Scientifique, Palaiseau, France
| | - Bernard Haye
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, UMR 7574, Chimie de la Matière Condensée de Paris, F-75005 Paris, France
| | - Corinne Illoul
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, UMR 7574, Chimie de la Matière Condensée de Paris, F-75005 Paris, France
| | - Jean-Marc Allain
- Solids Mechanics Laboratory, Ecole Polytechnique, Centre National de la Recherche Scientifique, Palaiseau, France
| | - Vincent M Borderie
- Sorbonne Universités, UPMC Univ Paris 06, UMR_S 968, Institut de la Vision, Paris F75012, France; INSERM, U968, Paris F75012, France; CNRS, UMR_7210, Paris F75012, France; Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts, DHU View Maintain, INSERM-DHOS CIC 1423, Paris F-75012, France
| | - Gervaise Mosser
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, UMR 7574, Chimie de la Matière Condensée de Paris, F-75005 Paris, France.
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Enea D, Henson F, Kew S, Wardale J, Getgood A, Brooks R, Rushton N. Extruded collagen fibres for tissue engineering applications: effect of crosslinking method on mechanical and biological properties. J Mater Sci Mater Med 2011; 22:1569-78. [PMID: 21556975 DOI: 10.1007/s10856-011-4336-1] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2010] [Accepted: 04/27/2011] [Indexed: 05/26/2023]
Abstract
Reconstituted collagen fibres are promising candidates for tendon and ligament tissue regeneration. The crosslinking procedure determines the fibres' mechanical properties, degradation rate, and cell-fibre interactions. We aimed to compare mechanical and biological properties of collagen fibres resulting from two different types of crosslinking chemistry based on 1-ethyl-3-(3-dimethyllaminopropyl)carbodiimide (EDC). Fibres were crosslinked with either EDC or with EDC and ethylene-glycol-diglycidyl-ether (EDC/EGDE). Single fibres were mechanically tested to failure and bundles of fibres were seeded with tendon fibroblasts (TFs) and cell attachment and proliferation were determined over 14 days in culture. Collagen type I and tenascin-C production were assessed by immunohistochemistry and dot-blotting. EDC chemistry resulted in fibres with average mechanical properties but the highest cell proliferation rate and matrix protein production. EDC/EGDE chemistry resulted in fibres with improved mechanical properties but with a lower biocompatibility profile. Both chemistries may provide useful structures for scaffolding regeneration of tendon and ligament tissue and will be evaluated for in vivo tendon regeneration in future experiments.
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Affiliation(s)
- Davide Enea
- Orthopaedic Research Unit, Department of Surgery, Cambridge University, Addenbrooke's Hospital, Hills Rd, CB22QQ Cambridge, UK.
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Wojewódzka-Zelezniakowicz M, Chabielska E, Mogielnicki A, Kramkowski K, Karp A, Opadczuk A, Domaniewski T, Malinowska-Zaprzałka M, Buczko W. Antithrombotic effect of tissue and plasma type angiotensin converting enzyme inhibitors in experimental thrombosis in rats. J Physiol Pharmacol 2006; 57:231-45. [PMID: 16845228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 11/18/2005] [Accepted: 04/28/2006] [Indexed: 05/10/2023]
Abstract
This study compared the antithrombotic effect of plasma angiotensin converting enzyme inhibitors (ACE-Is): captopril (CAP), enalapril (ENA) and tissue ACE-Is: perindopril (PER), quinapril (QUIN) in experimental venous and arterial thrombosis. Normotensive Wistar rats were treated p.o. with CAP (75 mg/kg), ENA (20 mg/kg), PER (2 mg/kg) and QUIN (3 mg/kg) for 10 days. The influence of ACE-Is on coagulation and fibrinolytic systems as well as platelet function was evaluated. The hypotensive effect of ACE-Is was equal in all groups. QUIN maintained the final carotid blood flow at the highest value in comparison to PER and plasma ACE-Is. The arterial thrombus weight was reduced in PER and QUIN groups while venous thrombus weight was also reduced after CAP. Tissue and plasma ACE-Is caused the inhibition of platelet adhesion and aggregation. A reduction of fibrin generation, prolongation of prothrombin time (PT), activated partial thromboplastin time (APTT) and shortening of euglobulin clot lysis time (ECLT) were observed after PER and QUIN treatment. In conclusion, given in equipotent hypotensive doses, tissue ACE-Is exerted more pronounced antithrombotic effect than plasma ACE-Is in experimental thrombosis. The differences between tissue and plasma ACE-Is in terms of their more pronounced inhibition of experimental thrombosis may be related to the intensified activation of fibrinolysis and inhibition of coagulation.
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Bernardo A, Bergeron AL, Sun CW, Guchhait P, Cruz MA, López JA, Dong JF. Von Willebrand factor present in fibrillar collagen enhances platelet adhesion to collagen and collagen-induced platelet aggregation. J Thromb Haemost 2004; 2:660-9. [PMID: 15102023 DOI: 10.1111/j.1538-7836.2004.00661.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
We examined the basis of the differences observed between different collagen preparations in their ability to aggregate platelets and support their adhesion under flow. As in previous studies, we found fibrillar collagen to be 10-fold more potent than acid-soluble collagen in inducing platelet aggregation and found that acid-soluble collagen did not support the adhesion of washed platelets under flow. Further, platelets in whole blood adhered to surfaces coated with either fibrillar or acid-soluble collagen, but thrombi formed faster and grew larger on fibrillar collagen. As a possible basis for this difference, we found that fibrillar collagen, but not acid-soluble collagen, contains a substantial quantity of von Willebrand factor (VWF), as demonstrated by enzyme-linked immunosorbent assay and by the ability of fibrillar collagen to support the adhesion of VWF antibody-coated beads and to agglutinate GPIb-IX-V complex-expressing Chinese hamster ovary cells. Supporting a role for VWF in collagen-induced platelet aggregation, aggregation induced by acid-soluble collagen was greatly enhanced by added VWF. Further, platelet aggregation by fibrillar collagen was partially blocked by a GPIbalpha antibody that inhibits the GPIb-VWF interaction. Taken together, these results suggest that much of the difference in prothrombotic potency of different collagens is directly related to their differences in VWF content. This probably accounts for the different conclusions made regarding the relative importance of different direct and indirect collagen receptors in collagen-dependent platelet functions and further emphasizes the close synergistic roles of the GPIb-IX-V complex and the collagen receptors GPVI and alpha2beta1 in supporting platelet adhesion.
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Affiliation(s)
- A Bernardo
- Section of Thrombosis Research, Department of Medicine, Baylor College of Medicine, Houston, TX 77030, USA
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Abstract
We compared the amount of new bone produced by statin collagen grafts with that produced by collagen grafts. Fifteen bone defects were created in the parietal bone of nine New Zealand White rabbits. In the experimental group, five defects were grafted with simvastatin dissolved in water for injection mixed with absorbable collagen sponge. In the control groups, five defects were grafted with water for injection mixed with absorbable collagen sponge alone (active control) and five were left empty (passive control). Animals were killed on day 14 and the defects were prepared for histological assessment. Serial sections were cut across the whole defect. Quantitative analysis of new bone formation was made on 100 sections using image analysis. A total of 308% more new bone was present in defects grafted with statin collagen grafts than those grafted with collagen grafts alone (P<0.0001). No bone was formed in the passive control group. In conclusion, statin collagen grafts were osteoinductive and can be used as a material for bone grafts.
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Affiliation(s)
- R W K Wong
- Orthodontics, University of Hong Kong, Government of Hong Kong SAR, Hong Kong
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