title: In vivo treatment of mice with heat shock protein, gp 96, improves survival of skin grafts with minor and major antigenic disparity.
abstract: Immunization with high doses of heat shock protein, gp 6 given in vivo, has been shown to mediate the activation of CD4+ T cell, which in turn suppresses an ongoing CD8+ immune response. Here we demonstrate that high doses of gp 6 (HDgp 6) (100 microg given subcutaneously on days 0 and 7 following skin graft transplantation) improve survival of skin grafts with both minor and major histocompatibility. First, skin from male C57BL/6 donors was grafted onto female C57BL/6 recipients that were subsequently treated with either HDgp 6 or buffer and graft survival was monitored. At 64 days post-transplantation, graft recipients treated with HDgp 6 showed 56% graft survival compared to 10% in those treated with buffer. Further, HDgp 6 down regulates a secondary immune response as well. Skin graft obtained from a male C57BL/6 donor was transplanted to a female C57BL/6 recipient that had previously rejected a male skin graft. Recipients that were treated with HDgp 96 showed a 75% graft survival of the secondary graft at 64 days post-transplantation, whereas recipients treated with buffer rejected their secondary grafts within 37 days. Finally, the effect of HDgp 96 treatment on survival of graft with major histoincompatibility was tested. Skin grafts from female BALB/c donors were transplanted to female C57BL/6 recipients previously treated with either HDgp 96 or buffer. Although all the grafts were ultimately rejected, mice treated with HDgp96 showed a delay in the rejection as compared with buffer controls. Our findings indicate that HDgp 96 improves survival of grafts with both minor and major antigenic disparity and could lead to developing novel therapies in transplant medicine.
authors.affiliation: Center for Immunotherapy, University of Connecticut School of Medicine, Farmington, CT 06030-1601, USA.
authors.forename: Joseph T
authors.initials: JT
authors.lastname: Kovalchin
authors.forename: Clyde
authors.initials: C
authors.lastname: Mendonca
authors.forename: Mihir S
authors.initials: MS
authors.lastname: Wagh
authors.forename: Ruibo
authors.initials: R
authors.lastname: Wang
authors.forename: Rajiv Y
authors.initials: RY
authors.lastname: Chandawarkar
mesh_terms: D000818:Animals; D000951:Antigens, Neoplasm / Q000276:immunology* / Q000494:pharmacology; D004306:Dose-Response Relationship, Immunologic; D005260:Female; D006084:Graft Rejection / Q000276:immunology / Q000517:prevention & control; D006085:Graft Survival / Q000187:drug effects / Q000276:immunology*; D006360:Heat-Shock Proteins / Q000276:immunology / Q000494:pharmacology*; D007114:Immunization; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D016038:Skin Transplantation / Q000276:immunology*; D014184:Transplantation, Homologous
chemical_list: D000951:Antigens, Neoplasm; D006360:Heat-Shock Proteins; C052646:sarcoma glycoprotein gp96 rejection antigens