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Different mechanisms mediate the rejection of porcine neurons and endothelial cells transplanted into the rat brain

Different mechanisms mediate the rejection of porcine neurons and endothelial cells transplanted... Abstract: In order to investigate the early cellular responses mediating xenograft rejection in the brain, porcine aortic endothelial cells (PAEC) or porcine fetal mesencephalic neurons (PNEU) were transplanted into the striatum of LEW.1A rats. PAEC were detected with a specific anti‐β1 integrin antibody, and PNEU with an anti‐porcine neurofilament antibody, or an antibody recognizing the NeuN antigen. PAEC grafts were massively infiltrated within 24 h by OX42‐positive cells, which may correspond to polymorphonuclear (PMN) cells or macrophages. At that moment, the graft contained numerous cells expressing the inducible isoform of NO‐synthase (iNOS). Infiltration by ED1‐positive macrophages was effective after three days. The β1‐integrin labeling decreased from that time‐point to day 7 post‐implantation, and vanished after 11 days. Although some OX8‐positive cells were present around the graft as soon as 3 days after transplantation, cells expressing the T‐cell receptor (TCR)‐β chain infiltrated the graft after 7 days and their number remained low. A strong, diffuse OX8‐and ED1‐positive immunoreactive material remained in the scar up to the third week. In striking contrast, PNEU grafts remained poorly infiltrated by OX42‐ or ED1‐positive cells during the first two weeks. A massive infiltration by macrophages and TCRβ‐positive lymphocytes occurred after 3 weeks. Natural killer (NK) cells were more scarce. The inflammation territory enlarged, and blood vessels were overloaded with macrophages or lymphocytes. Nevertheless, the graft contained NeuN‐positive nuclei and neurites harbouring the porcine neurofilament protein. Hence, rejection was not completed at this time‐point. These results suggest that the rapid rejection of PAEC is mainly driven by macrophages and possibly PMN cells, unlike PNEU, whose rejection is delayed and also involves lymphocytes. Differences in immunogenicity of grafted cells and/or patterns of production of pro‐inflammatory cytokines may account for these contrasted rejection kinetics. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Xenotransplantation Wiley

Different mechanisms mediate the rejection of porcine neurons and endothelial cells transplanted into the rat brain

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References (57)

Publisher
Wiley
Copyright
Copyright © 2001 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0908-665X
eISSN
1399-3089
DOI
10.1034/j.1399-3089.2001.00076.x
Publisher site
See Article on Publisher Site

Abstract

Abstract: In order to investigate the early cellular responses mediating xenograft rejection in the brain, porcine aortic endothelial cells (PAEC) or porcine fetal mesencephalic neurons (PNEU) were transplanted into the striatum of LEW.1A rats. PAEC were detected with a specific anti‐β1 integrin antibody, and PNEU with an anti‐porcine neurofilament antibody, or an antibody recognizing the NeuN antigen. PAEC grafts were massively infiltrated within 24 h by OX42‐positive cells, which may correspond to polymorphonuclear (PMN) cells or macrophages. At that moment, the graft contained numerous cells expressing the inducible isoform of NO‐synthase (iNOS). Infiltration by ED1‐positive macrophages was effective after three days. The β1‐integrin labeling decreased from that time‐point to day 7 post‐implantation, and vanished after 11 days. Although some OX8‐positive cells were present around the graft as soon as 3 days after transplantation, cells expressing the T‐cell receptor (TCR)‐β chain infiltrated the graft after 7 days and their number remained low. A strong, diffuse OX8‐and ED1‐positive immunoreactive material remained in the scar up to the third week. In striking contrast, PNEU grafts remained poorly infiltrated by OX42‐ or ED1‐positive cells during the first two weeks. A massive infiltration by macrophages and TCRβ‐positive lymphocytes occurred after 3 weeks. Natural killer (NK) cells were more scarce. The inflammation territory enlarged, and blood vessels were overloaded with macrophages or lymphocytes. Nevertheless, the graft contained NeuN‐positive nuclei and neurites harbouring the porcine neurofilament protein. Hence, rejection was not completed at this time‐point. These results suggest that the rapid rejection of PAEC is mainly driven by macrophages and possibly PMN cells, unlike PNEU, whose rejection is delayed and also involves lymphocytes. Differences in immunogenicity of grafted cells and/or patterns of production of pro‐inflammatory cytokines may account for these contrasted rejection kinetics.

Journal

XenotransplantationWiley

Published: May 1, 2001

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