Abstract:
:There is growing interest in gene delivery to the eye in order to develop gene therapy for the many ocular disorders which may be amenable to this approach. To date, recombinant adenoviruses (AV) have been the main vector used for gene delivery to anterior and posterior segments in animal models. As with delivery to other organs, immune responses to vector and transgene limit the duration of expression in the eye. Using an E1-deleted adenoviral vector carrying a lacZ reporter gene, we have previously demonstrated that a T cell-mediated immune response reduces the level of intra-ocular transgene expression over time and limits it to around 3 weeks in mice. This report describes a strategy for prolonging gene expression by blocking the B7-CD28 interactions between antigen presenting cells (APC) and T cells in order to prevent the costimulatory signals required for T cell survival and proliferation. This was achieved by the co-injection of AV encoding a secreted immunomodulatory molecule (CTLA4-Ig) which consists of the extra-cellular domain of mouse CTLA4 fused to the Fc region of human IgG. Subretinal co-injection of AV encoding beta galactosidase with AV encoding CTLA4-Ig results in prolonged expression in retinal cells compared with subretinal injection of only adenovirus encoding beta galactosidase.
journal_name
Gene Therjournal_title
Gene therapyauthors
Ali RR,Reichel MB,Byrnes AP,Stephens CJ,Thrasher AJ,Baker D,Hunt DM,Bhattacharya SSdoi
10.1038/sj.gt.3300761subject
Has Abstractpub_date
1998-11-01 00:00:00pages
1561-5issue
11eissn
0969-7128issn
1476-5462journal_volume
5pub_type
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