Cited by 87Xenotransplantation and immune responseOrgan and Tissue Transplantation ResearchAnimal Genetics and Reproduction

Reduced Binding of Human Antibodies to Cells From GGTA1/CMAH KO Pigs

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Burlak, C., Paris, L.L., Lutz, A.J., Sidner, R.A., Estrada, J., Li, P., Tector, M., Tector, A.J.·2014·American Journal of Transplantation

Abstract

Xenotransplantation using genetically modified pig organs could solve the donor organ shortage problem. Two inactivated genes that make humans unique from pigs are GGTA1 and CMAH, the products of which produce the carbohydrate epitopes, aGal and Neu5Gc that attract preformed human antibody. When the GGTA1 and CMAH genes were deleted in pigs, human antibody binding was reduced in preliminary analysis. We analyzed the binding of human IgM and IgG from 121 healthy human serum samples for binding to GGTA1 KO and GGTA1/CMAH KO peripheral blood mononuclear cells (PBMCs). We analyzed a sub population for reactivity toward genetically modified pig PBMCs as compared to chimpanzee and human PBMCs. Deletion of the GGTA1 and CMAH genes in pigs improved the crossmatch results beyond those observed with chimpanzees. Sorting the 121 human samples tested against the GGTA1/CMAH KO pig PBMCs did not reveal a distinguishing feature such as blood group, age or gender. Modification of genes to make pig carbohydrates more similar to humans has improved the crossmatch with human serum significantly.

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  • Xenogeneic sialic acids are one of the leading non-α-gal antigens, participating in the rejection of xenografts.

    “Xenogeneic sialic acids are one of the leading non-α-gal antigens, participating in the rejection of xenografts [133–135].”

    From Immunogenicity of decellularized extracellular matrix scaffolds: a bottleneck in tissue engineering and regenerative medicine (2023) · cites this paper as [134]

    The Introduction (page unavailable) identifies Neu5Gc, a sialic acid found in pigs but not humans, as a significant xenoantigen. The Discussion (page unavailable) reports improved human-antibody crossmatches after Neu5Gc was removed. The paper does not establish that xenogeneic sialic acids generally are leading non-α-gal antigens or directly demonstrate their participation in xenograft rejection. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Exposing cells of GT-CMAH knockout pigs (which lack expression of α-gal and Neu5Gc epitopes) to human serum demonstrates fewer antigen-antibody reactions.

    “Exposing cells of GT-CMAH knockout pigs (which lack expression of α-gal and Neu5Gc epitopes) to human serum demonstrates fewer antigen-antibody reactions [133, 134].”
  • α-Gal and the nonhuman sialic acid Neu5Gc represent the major xenoantigens that must be bypassed for xenotransplantation into humans, and α-Gal- and Neu5Gc-double null pigs have recently been generated.

    “glycans like ɑ -Gal and the nonhuman sialic acid Neu5Gc represent the major xenoantigens that must be bypassed, to pursue the goal of xeno- (pig organ) transplantation into humans. In pursuit of this dif fi cult goal, ɑ -Galand Neu5Gc-double null pigs have recently been generated (980 -983).”

    From Biological roles of glycans (2017) · cites this paper as [981]

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  1. [5]Hardy MA Xenograft 25 1989 Amsteram Elsevier Science Publishers B.V. 1
  2. [29]Byrne GW Stalboerger PG Du Z Davis TR McGregor CGA Identification of new carbohydrate and membrane protein antigens in cardiac xenotransplantation 2011 2 15 91 3 287 292 Available from: http://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&id=21119562&retmode=ref&cmd=prlinks PMC10022691 21119562

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Authors
Burlak, C., Paris, L. L., Lutz, A. J., Sidner, R. A., Estrada, J., Li, P., Tector, M., & Tector, A. J.
Affiliations
  • Indiana University School of Medicine (US)
  • Indiana University Health (US)
Corresponding author
Tector, A.J.
Venue
American Journal of Transplantation
Publisher
Elsevier BV
Published
2014-08
Volume
14
Issue
8
Pages
1895-1900
ISSN
1600-6135 (ISSN-L)
OpenAlex
W1861997829
Cited by
87
References
29
Citations by year
2026: 8 · 2025: 3 · 2024: 1 · 2023: 5 · 2022: 9 · 2021: 5 · 2020: 12 · 2019: 8 · 2018: 7 · 2017: 9 · 2016: 11 · 2015: 9
FWCI
9.59
Type
journal article
Language
en
Open access
Locations
  • American Journal of Transplantation (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • IUScholarWorks (Indiana University) (submittedVersion)
  • Purdue University Indianapolis (Indiana University) (submittedVersion)
Funders
IU Health Transplant Institute
Topics
  • Health Sciences › Medicine › Surgery › Xenotransplantation and immune response
  • Health Sciences › Medicine › Transplantation › Organ and Tissue Transplantation Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Animal Genetics and Reproduction
Keywords
xenotransplantation, genetically modified pigs, GGTA1, CMAH, crossmatch, peripheral blood mononuclear cells, IgM, IgG, chimpanzee comparison, xenogeneic immune response
MeSH terms
Adolescent, Adult, Aged, Animals, Antibodies, Epitopes, Carbohydrates, Pan troglodytes, Female, Galactosyltransferases, Graft Rejection, Humans, Immunoglobulin G, Immunoglobulin M, Leukocytes, Mononuclear, Male, Middle Aged, Protein Binding, Swine, Transplantation, Heterologous, Gene Deletion, Animals, Genetically Modified

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