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American Journal of Pathology, Vol 142, 675-683, Copyright © 1993 by American Society for Investigative Pathology
REGULAR ARTICLES |
M Sadahiro, TO McDonald and MD Allen
Department of Surgery, University of Washington, Seattle.
Whether antibody blockage of leukocyte receptors for intercellular adhesion molecule-1 and vascular cell adhesion molecule-1 would prevent cardiac graft rejection was studied in a rabbit heterotopic transplant model. Monoclonal antibody 60.3, anti-CD18 (intercellular adhesion molecule-1 receptor, Group 1, n = 10) and monoclonal antibody HP1/2, anti-VLA-alpha 4 (vascular cell adhesion molecule-1 receptor, Group 2, n = 10) were administered to transplanted unimmunosuppressed animals. At 7 days, donor heart histology was compared to transplanted untreated controls (Group 3, n = 11). Peripheral white blood cell counts on postoperative day 2 were significantly higher in both treatment groups than controls. Significant increases in circulating neutrophils occurred in Group 1 (P < or = 0.05); lymphocytes predominated in Group 2 (P < or = 0.05). A significant reduction in cellular rejection was seen in Group 1 (P < or = 0.05) but not Group 2 hearts. Group 1 hearts demonstrated localization of lymphocytes to perivenular collections, whereas Group 2 hearts evidenced diffuse interstitial infiltration. Both treatment groups demonstrated a reduction in transplant arteritis compared to controls. Results suggest that monoclonal antibody 60.3 (anti-CD18) may hold promise as a therapeutic agent for both cellular and vascular rejection. Monoclonal antibody HP1/2 (anti-VLA-alpha 4) may reduce vascular rejection disproportionate to cellular rejection.
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