Expression of NeuGc on Pig Corneas and Its Potential Significance in Pig Corneal Xenotransplantation. Cornea 2016 Jan;35(1):105-13
Date
09/30/2015Pubmed ID
26418433Pubmed Central ID
PMC4847538DOI
10.1097/ICO.0000000000000635Scopus ID
2-s2.0-84951905622 (requires institutional sign-in at Scopus site) 20 CitationsAbstract
PURPOSE: Pigs expressing neither galactose-α1,3-galactose (Gal) nor N-glycolylneuraminic acid (NeuGc) take xenotransplantation one step closer to the clinic. Our aims were (1) to document the lack of NeuGc expression on corneas and aortas and cultured endothelial cells [aortic endothelial cells (AECs); corneal (CECs)] of GTKO/NeuGcKO pigs, and (2) to investigate whether the absence of NeuGc reduced human antibody binding to the tissues and cells.
METHODS: Wild-type (WT), GTKO, and GTKO/NeuGcKO pigs were used for the study. Human tissues and cultured cells were negative controls. Immunofluorescence staining was performed using anti-Gal and anti-NeuGc antibodies, and human IgM and IgG binding to tissues was determined. Flow cytometric analysis was used to determine Gal and NeuGc expression on cultured CECs and AECs and to measure human IgM/IgG binding to these cells.
RESULTS: Both Gal and NeuGc were detected on WT pig corneas and aortas. Although GTKO pigs expressed NeuGc, neither humans nor GTKO/NeuGcKO pigs expressed Gal or NeuGc. Human IgM/IgG binding to corneas and aortas from GTKO and GTKO/NeuGcKO pigs was reduced compared with binding to WT pigs. Human antibody binding to GTKO/NeuGcKO AECs was significantly less than that to GTKO AECs, but there was no significant difference in binding between GTKO and GTKO/NeuGcKO CECs.
CONCLUSIONS: The absence of NeuGc on GTKO aortic tissue and AECs is associated with reduced human antibody binding, and possibly will provide a better outcome in clinical xenotransplantation using vascularized organs. For clinical corneal xenotransplantation, the absence of NeuGc expression on GTKO/NeuGcKO pig corneas may not prove an advantage over GTKO corneas.
Author List
Lee W, Miyagawa Y, Long C, Ekser B, Walters E, Ramsoondar J, Ayares D, Tector AJ, Cooper DK, Hara HAuthor
Whayoung Lee MD Assistant Professor in the Pathology department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
AnimalsCells, Cultured
Cornea
Corneal Diseases
Corneal Transplantation
Flow Cytometry
Humans
Neuraminic Acids
Swine
Transplantation, Heterologous