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IgY antiporcine endothelial cell antibodies effectively block human antiporcine xenoantibody binding

IgY antiporcine endothelial cell antibodies effectively block human antiporcine xenoantibody binding Avian IgY antibodies are structurally different from mammalian IgGs and do not fix mammalian complement components or bind human Fc receptors. As these antibody‐mediated interactions are believed to play significant roles in both hyperacute rejection (HAR) and acute vascular xenograft rejection (AVXR), IgY antibodies to xenoantigen target epitopes may inhibit these rejection processes. In this report, we show that chicken IgY antibodies to α‐Gal antigen epitopes and to other porcine aortic endothelial cell (PAEC) antigens block human xenoreactive natural antibody binding to both porcine and rat cardiac tissues and porcine kidney tissues. Chicken IgY antibodies blocked complement‐mediated lysis of PAECs by human serum, and inhibited antibody‐dependent cell‐mediated lysis of PAECs by heat‐inactivated human serum plus peripheral blood leukocytes. Binding of IgY to porcine endothelial cells did not affect cell morphology nor expression of E‐selectin. These results suggest that avian IgYs could be of potential use in inhibiting pig‐to‐human xenograft rejection. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Xenotransplantation Wiley

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References (75)

Publisher
Wiley
Copyright
Copyright © 1999 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0908-665X
eISSN
1399-3089
DOI
10.1034/j.1399-3089.1999.00015.x
Publisher site
See Article on Publisher Site

Abstract

Avian IgY antibodies are structurally different from mammalian IgGs and do not fix mammalian complement components or bind human Fc receptors. As these antibody‐mediated interactions are believed to play significant roles in both hyperacute rejection (HAR) and acute vascular xenograft rejection (AVXR), IgY antibodies to xenoantigen target epitopes may inhibit these rejection processes. In this report, we show that chicken IgY antibodies to α‐Gal antigen epitopes and to other porcine aortic endothelial cell (PAEC) antigens block human xenoreactive natural antibody binding to both porcine and rat cardiac tissues and porcine kidney tissues. Chicken IgY antibodies blocked complement‐mediated lysis of PAECs by human serum, and inhibited antibody‐dependent cell‐mediated lysis of PAECs by heat‐inactivated human serum plus peripheral blood leukocytes. Binding of IgY to porcine endothelial cells did not affect cell morphology nor expression of E‐selectin. These results suggest that avian IgYs could be of potential use in inhibiting pig‐to‐human xenograft rejection.

Journal

XenotransplantationWiley

Published: May 1, 1999

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