Volume 13, Issue 5 pp. 440-446

Recognition of a carbohydrate xenoepitope by human NKRP1A (CD161)

Dale Christiansen

Dale Christiansen

Department of Surgery, The University of Melbourne, Austin Health/Northern Health, Heidelberg, Victoria, Australia

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Effie Mouhtouris

Effie Mouhtouris

Department of Surgery, The University of Melbourne, Austin Health/Northern Health, Heidelberg, Victoria, Australia

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Julie Milland

Julie Milland

Department of Surgery, The University of Melbourne, Austin Health/Northern Health, Heidelberg, Victoria, Australia

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Alessandra Zingoni

Alessandra Zingoni

Department of Experimental Medicine and Pathology, Instituto Pasteur-Fondazione Cenci Bolognetti, University La Sapienza, Rome, Italy

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Angela Santoni

Angela Santoni

Department of Experimental Medicine and Pathology, Instituto Pasteur-Fondazione Cenci Bolognetti, University La Sapienza, Rome, Italy

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Mauro S. Sandrin

Mauro S. Sandrin

Department of Surgery, The University of Melbourne, Austin Health/Northern Health, Heidelberg, Victoria, Australia

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First published: 22 August 2006
Citations: 33
Address reprint requests to Professor Mauro S. Sandrin, Department of Surgery, The University of Melbourne, Austin Health/Northern Health, Heidelberg, Victoria 3084, Australia
(E-mail: [email protected])

Abstract

Abstract: Background: Many immunologically important interactions are mediated by leukocyte recognition of carbohydrates via cell surface receptors. Uncharacterized receptors on human natural killer (NK) cells interact with ligands containing the terminal Galα(1,3)Gal xenoepitope. The aim of this work was to isolate and characterize carbohydrate binding proteins from NK cells that bind αGal or other potential xenoepitopes, such as N-acetyllactosamine (NAcLac), created by the deletion of α1,3galactosyltransferase (GT) in animals.

Methods and results: Initial analysis suggested the human C-type lectin NKRP1A bound to a pool of glycoconjugates, the majority of which contained the terminal Galα(1,3)Gal epitope. This was confirmed by high level binding of cells expressing NKRP1A to mouse laminin, which contains a large number of N-linked oligosaccharides with the Galα(1,3)Gal structure. The consequence of removing the terminal αGal was then investigated. Elevated NAcLac levels were observed on thymocytes from GT−/− mice. Exposing NAcLac on laminin, by α-galactosidase treatment, resulted in a significant increase in NKRP1A binding.

Conclusions: NKRPIA binds to the αGal epitope. Moreover, exposing NAcLac by removal of αGal resulted in an increase in binding. This may be relevant in the later phases of xenotransplant rejection if GT−/− pigs, like GT−/− mice, display increased NAcLac expression.

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