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Published in: International Ophthalmology 1/2021

01-01-2021 | Original Paper

Intrastromal implantation of chicken corneal grafts into the cornea of rabbits for corneal thickening: an experimental study

Authors: Flavia Motta Almodin, Juliana Motta Almodin, Edna Motta Almodin, Nilma Fernandes, Paulo Ferrara, Antonio Gonçalves

Published in: International Ophthalmology | Issue 1/2021

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Abstract

Purpose

To evaluate the feasibility and effects of the intrastromal implantation of chemically modified corneal stroma obtained from chicken into the corneas of rabbits for corneal thickening.

Methods

Chicken corneas were cut, debrided, treated with cross-linking and implanted in an intrastromal pouch created in the cornea of 10 white New Zealand rabbits with femtosecond laser. Slit-lamp biomicroscopy and optical coherence tomography were performed immediately, 7, 30 and 90 days postoperatively. Corneas were removed at 90 days and cut in two halves. One half was sent to histological analysis for the presence of necrosis, polymorphonuclear inflammatory cells, blood vessels and fibrosis, while the other half was evaluated with transmission electron microscopy to verify tissue organization and the presence of keratocytes and inflammatory cells. Corneal thicknesses were comparatively analyzed over time with Wilcoxon test (p ≤ 0.05).

Results

The chicken grafts were incorporated into the cornea of all animals over time. Mean rabbit cornea thickness increased from 338 µm preoperatively to 538 µm (p < 0.0077) at 90 days, while mean chicken graft thickness decreased from 350 to 215 µm (p < 0.0077). No clear signs of rejection attributable to the xenograft were observed in any of the implanted eyes. However, some macroscopic and histological events were observed in some of the eyes, probably due to procedural issues during implantation.

Conclusion

The intrastromal implantation of chicken grafts was shown to be feasible and predictable to thicken the recipient rabbit cornea without apparent rejection. However, before being considered in humans, further meticulous clinical trials are required to establish the clinical utility, safety and efficacy of xenografts for the treatment of patients with advanced keratoconus.
Literature
8.
go back to reference Tuft SJ, Buckley RJ (1995) Iris ischaemia following penetrating keratoplasty for keratoconus (Urrets-Zavalia syndrome). Cornea 14(6):618–622PubMed Tuft SJ, Buckley RJ (1995) Iris ischaemia following penetrating keratoplasty for keratoconus (Urrets-Zavalia syndrome). Cornea 14(6):618–622PubMed
14.
go back to reference Li M, Li M, Sun L, Han T, Ding L, Xiang J, Zhou X (2018) In vivo confocal microscopic investigation of the cornea after autologous implantation of lenticules obtained through small incision lenticule extraction for treatment of hyperopia. Clin Exp Optom 101:38–45. https://doi.org/10.1111/cxo.12595CrossRefPubMed Li M, Li M, Sun L, Han T, Ding L, Xiang J, Zhou X (2018) In vivo confocal microscopic investigation of the cornea after autologous implantation of lenticules obtained through small incision lenticule extraction for treatment of hyperopia. Clin Exp Optom 101:38–45. https://​doi.​org/​10.​1111/​cxo.​12595CrossRefPubMed
18.
go back to reference Gonzalez-Andrades M, Sharifi R, Islam MM, Divoux T, Haist M, Paschalis EI, Gelfand L, Mamodaly S, Di Cecilia L, Cruzat A, Ulm FJ, Chodosh J, Delori F, Dohlman CH (2018) Improving the practicality and safety of artificial corneas: pre-assembly and gamma-rays sterilization of the Boston Keratoprosthesis. Ocul Surf 16:322–330. https://doi.org/10.1016/j.jtos.2018.04.002CrossRefPubMed Gonzalez-Andrades M, Sharifi R, Islam MM, Divoux T, Haist M, Paschalis EI, Gelfand L, Mamodaly S, Di Cecilia L, Cruzat A, Ulm FJ, Chodosh J, Delori F, Dohlman CH (2018) Improving the practicality and safety of artificial corneas: pre-assembly and gamma-rays sterilization of the Boston Keratoprosthesis. Ocul Surf 16:322–330. https://​doi.​org/​10.​1016/​j.​jtos.​2018.​04.​002CrossRefPubMed
19.
go back to reference Islam MM, Buznyk O, Reddy JC, Pasyechnikova N, Alarcon EI, Hayes S, Lewis P, Fagerholm P, He C, Iakymenko S, Liu W, Meek KM, Sangwan VS, Griffith M (2018) Biomaterials-enabled cornea regeneration in patients at high risk for rejection of donor tissue transplantation. NPJ Regen Me 3:2. https://doi.org/10.1038/s41536-017-0038-8CrossRef Islam MM, Buznyk O, Reddy JC, Pasyechnikova N, Alarcon EI, Hayes S, Lewis P, Fagerholm P, He C, Iakymenko S, Liu W, Meek KM, Sangwan VS, Griffith M (2018) Biomaterials-enabled cornea regeneration in patients at high risk for rejection of donor tissue transplantation. NPJ Regen Me 3:2. https://​doi.​org/​10.​1038/​s41536-017-0038-8CrossRef
26.
33.
go back to reference del Barrio JLA, Chiesa M, Garagorri N, Garcia-Urquia N, Fernandez-Delgado J, Bataille L, Rodriguez A, Arnalich-Montiel F, Zarnowski T, de Toledo JPÁ, Alio JL, De Miguel MP (2015) Acellular human corneal matrix sheets seeded with human adipose-derived mesenchymal stem cells integrate functionally in an experimental animal model. Exp Eye Res 132:91–100. https://doi.org/10.1016/j.exer.2015.01.020CrossRef del Barrio JLA, Chiesa M, Garagorri N, Garcia-Urquia N, Fernandez-Delgado J, Bataille L, Rodriguez A, Arnalich-Montiel F, Zarnowski T, de Toledo JPÁ, Alio JL, De Miguel MP (2015) Acellular human corneal matrix sheets seeded with human adipose-derived mesenchymal stem cells integrate functionally in an experimental animal model. Exp Eye Res 132:91–100. https://​doi.​org/​10.​1016/​j.​exer.​2015.​01.​020CrossRef
Metadata
Title
Intrastromal implantation of chicken corneal grafts into the cornea of rabbits for corneal thickening: an experimental study
Authors
Flavia Motta Almodin
Juliana Motta Almodin
Edna Motta Almodin
Nilma Fernandes
Paulo Ferrara
Antonio Gonçalves
Publication date
01-01-2021
Publisher
Springer Netherlands
Published in
International Ophthalmology / Issue 1/2021
Print ISSN: 0165-5701
Electronic ISSN: 1573-2630
DOI
https://doi.org/10.1007/s10792-020-01573-4

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