Abstract
Background
To investigate the therapeutic effect of CTLA4-FasL—B7 costimulatory pathway blockage—on graft survival in a murine model of corneal transplantation.
Methods
Orthotopic penetrating keratoplasty was performed on BALB/c mice. The mice were randomized into four groups: the isograft group, untreated allograft group, cyclosporine A drug delivery system (CsA DDS)-anterior chamber implanted group, and 10 μg/mL CTLA4-FasL-treated group. Allografts were from C57BL/6 mice. Survival time of corneal grafts was evaluated. Immunohistological method and TdT-mediated dUTP Nick End Labeling (TUNEL) were applied for the detection of CD4+ T cells and apoptotic cells in corneal transplants. To assess whether peripheral immune tolerance appeared after the treatment of CTLA4-FasL, CsA DDS-implanted- and CTLA4-FasL-treated BALB/c mice with clear grafts received skin allografts at 4 weeks after keratoplasty, and the status of corneal transplants were observed when skin grafts were rejected.
Results
Allografts in the CTLA4-FasL group (median survival time [MST] = 106 days, p = 0.0042) and the CsA DDS group (MST = 60 days, p = 0.0037) revealed extending survival time, compared with that in the untreated allograft group (MST = 14 days). There were significantly fewer CD4-positive T cells in both the isograft group and the CsA DDS group. In the untreated allograft group, the number of CD4+ T cells gradually increased from day 1 until the final day of observation (day 21). By contrast, it reached a peak on day 7 and then absolutely reduced in the CTLA4-FasL group. Many apoptotic cells were detected on day 7 in the CTLA4-FasL group, but very few were seen in the other groups. Within 30 days of skin-graft rejection, previously healthy and long-standing corneal grafts became rejected in the CsA DDS group but remained clear in the CTLA4-FasL group.
Conclusions
CTLA4-FasL can prolong the survival time of corneal allografts in mice, exerting a negative regulation on T-cell activation simultaneously by blocking B7 costimulatory signals and inducing Fas-FasL apoptotic pathway. Due to the adjunctive role of FasL, it also appears to be a potential activity of tolerance induction through T-cell apoptotic pathways.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (30271239), the Natural Science Foundation of Shandong Province (Y2002c14), the National Basic Research Program of China (973 Program) (2003cb515500), and the Department of Science and Technology of Shandong Province (021100105). The authors thank Ms. Ping Lin for her editorial assistance.
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Shi, W., Chen, M. & Xie, L. Prolongation of corneal allograft survival by CTLA4-FasL in a murine model. Graefes Arch Clin Exp Ophthalmol 245, 1691–1697 (2007). https://doi.org/10.1007/s00417-007-0606-5
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DOI: https://doi.org/10.1007/s00417-007-0606-5