Adenovirus-mediated gene delivery to the corneal endothelium

Transplantation
Daniel F P LarkinA J George

Abstract

Genetic manipulation of donor cornea prior to transplantation has the potential to modulate the allogeneic response, as well as the endothelial cell function. This study examined the feasibility of gene transfer to corneal endothelial cells using replication-defective recombinant adenoviral vectors. Adult rabbits corneas were infected with recombinant adenovirus RAd35, containing the Escherichia coli beta-galactosidase (lacZ) gene. Localization of gene transfer was assessed by histochemical staining for beta-galactosidase and recombinant protein production was quantified by a soluble assay. In initial experiments, the efficiency of gene transfer and kinetics of expression were studied ex vivo, using organ culture of transfected corneas. Following coculture of whole corneal fragments with RAd35, high levels of gene expression were evident on days 107, diminishing after that time. Gene transfer was found to be almost entirely restricted to corneal endothelial cells, with scattered expression in epithelial cells. Following these ex vivo studies, genetically modified corneas were transplanted as orthotopic allografts in rabbits. Similar kinetics of gene expression were seen after transplantation as in the ex vivo experiment, with m...Continue Reading

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