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https://hdl.handle.net/2440/8653
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Type: | Journal article |
Title: | A new model of orthotopic penetrating corneal transplantation in the sheep: Graft survival, phenotypes of graft-infiltrating cells and local cytokine production |
Author: | Williams, K. Standfield, S. Mills, R. Takano, T. Larkin, D. Krishnan, R. Russ, G. Coster, D. |
Citation: | Australian and New Zealand journal of ophthalmology, 1999; 27(2):127-135 |
Publisher: | BLACKWELL SCIENCE ASIA |
Issue Date: | 1999 |
ISSN: | 0814-9763 1440-1606 |
Abstract: | <h4>Background</h4>Orthotopic penetrating keratoplasty in the sheep was developed as an outbred preclinical model to allow correlation of the cellular infiltrate during graft rejection with local production of cytokine mRNA.<h4>Methods</h4>Penetrating corneal autografts and allografts were performed in Merino sheep. Graft outcome was followed at the slit-lamp. Corneal infiltrates were examined by immunoperoxidase staining on postmortem specimens. Cytokine mRNA was detected by polymerase chain reaction.<h4>Results</h4>Corneal autografts survived indefinitely. Allografts became vascularized and underwent rejection at a median of 20 days postgraft. Both endothelial and epithelial rejection lines were observed. Immunohistochemical staining of rejecting grafts showed up-regulation of major histocompatibility complex class I molecules on corneal graft epithelium, damaged or absent graft endothelium and a marked, predominantly mononuclear cell infiltrate. CD4-positive T cells were observed in the graft within 2 days of the onset of rejection, followed several days later by CD8-positive T cells. Messenger RNA transcripts for interleukin (IL)-2, tumour necrosis factor (TNF)-alpha and IL-10 (but not for interferon (IFN)-gamma or IL-4) were found in autografted corneas. Proportionately, more allografts than autografts contained transcripts for IL-2 and TNF-alpha, and IFN-gamma was detected in three of four allografts.<h4>Conclusions</h4>Corneal graft rejection in the sheep is macroscopically and histologically similar to human corneal graft rejection. Allografts become infiltrated by both CD4- and CD8-positive T cells and local production of pro-inflammatory cytokines occurs during graft rejection. |
Keywords: | Cornea Animals Sheep RNA, Messenger Cytokines Corneal Transplantation Immunohistochemistry Graft Survival Phenotype Female |
DOI: | 10.1046/j.1440-1606.1999.00171.x |
Published version: | http://dx.doi.org/10.1046/j.1440-1606.1999.00171.x |
Appears in Collections: | Aurora harvest 4 Medicine publications |
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