Murine orthotopic corneal transplantation in high-risk eyes. Rejection is dictated primarily by weak rather than strong alloantigens.
OBJECTIVE
Using a model of orthotopic corneal transplantation in which allografts were placed in normal eyes of mice, the authors previously reported that grafts bearing minor H antigens alone are more likely to be rejected (approximately 50%) than are grafts displaying only major histocompatibility (MHC) alloantigens (20%). These studies have been extended to include corneal grafts placed in neovascularized high-risk eyes of recipient mice.


METHODS
Neovascularization was induced by placing sutures in the central cornea of one eye of recipient mice. Two weeks later, MHC class I only, class II only, minor H only, or MHC+minor H disparate corneas were grafted into these sutured eyes, and their rejection rates were examined.


RESULTS
Although MHC+minor H disparate corneal allografts were rejected uniformly in neovascularized graft beds in 12 (100%) of 12, MHC class I only disparate grafts were rejected in 8 (66.7%) of 12 and MHC class II only disparate corneal allografts were rejected in 7 (58.3%) of 12. Surprisingly, the rejection rate of minor H only disparate corneal allografts was 10 (90.9%) of 11.


CONCLUSIONS
These findings indicate that for orthotopic corneal allografts placed in high-risk graft beds, minor H antigens offer a more formidable barrier to graft acceptance than do MHC-encoded antigens. The authors speculate that this unexpected outcome may reflect a reduced level of MHC expression on corneal tissue. Moreover, because the cornea as a graft lacks bone marrow-derived dendritic cells, allorecognition by recipient T cells must occur by way of the indirect pathway of alloantigen processing, and in this situation, minor H antigens may compete favorably with MHC antigens for presentation by recipient antigen-presenting cells that infiltrate the graft.
Sano
Y
Y
Schepens Eye Research Institute, Boston, MA 02114, USA.
Ksander
B R
BR
Streilein
J W
JW
D000818:Animals; D003315:Cornea / Q000601:surgery; D016039:Corneal Transplantation; D006084:Graft Rejection / Q000276:immunology*; D006085:Graft Survival; D015395:Histocompatibility Antigens Class I / Q000276:immunology; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D007519:Isoantigens / Q000276:immunology*; D051379:Mice; D008815:Mice, Inbred Strains; D015778:Minor Histocompatibility Antigens / Q000276:immunology; D009389:Neovascularization, Pathologic / Q000209:etiology / Q000601:surgery; D012307:Risk Factors; D013537:Sutures
D015395:Histocompatibility Antigens Class I; D000949:Histocompatibility Antigens Class II; D007519:Isoantigens; D015778:Minor Histocompatibility Antigens