The high-risk corneal regraft model: a justification for tissue matching in humans.
Transpl Int
; 26(4): 453-61, 2013 Apr.
Article
in En
| MEDLINE
| ID: mdl-23398177
ABSTRACT
Models of high-risk corneal graft rejection involve neovascularization induced via innate immune responses, e.g., suture-mediated trauma. We describe a model of high-risk corneal graft rejection using corneal graft donor-recipient pairing based on a single-antigen disparity. Donor corneas from transgenic mice on B10.BR (H-2k ) background, in which hen-egg lysozyme (HEL) as a membrane-bound antigen (mHEL) was expressed under the major histocompatibility complex (MHC) class I promoter (KLK-mHEL, H-2k), were transplanted into wild type B10.BR recipient mice. Unmanipulated wild type recipient mice rejected KLK-mHEL grafts (39%) slowly over 50-60 days. Graft rejection incidence was maximized (100%) and tempo accelerated (27 days) by priming with HEL-pulsed syngeneic dendritic cells and less so by increasing T-cell precursor frequency. Rejection also reached maximum levels (100%) and tempo (3-8 days) when mice which had rejected a first graft ('rejectors') were regrafted, and was associated with induction of HEL-specific memory T cells. In contrast, 'acceptors' rejected a second graft at rates and tempo similar to naïve mice. These data reveal the importance of (i) donor MHC antigens as alloantigens for indirect recognition, (ii) alloantigen-specific memory in high-risk graft rejection involving regrafts, and (iii) suggest a role for tissue matching in human corneal graft to avoid sensitization to donor MHC antigens.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Histocompatibility Testing
/
Corneal Transplantation
Type of study:
Etiology_studies
Limits:
Animals
/
Humans
Language:
En
Journal:
Transpl Int
Journal subject:
TRANSPLANTE
Year:
2013
Type:
Article
Affiliation country:
United kingdom