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Reproduction, Fertility and Development Reproduction, Fertility and Development Society
Vertebrate reproductive science and technology
RESEARCH ARTICLE

Targeting αGal epitopes for multi-species embryo immunosurgery

Mayuko Kurome https://orcid.org/0000-0002-2725-8613 A C D * , Andrea Baehr B * , Kilian Simmet A * , Eva-Maria Jemiller A , Stefanie Egerer A , Maik Dahlhoff A , Valeri Zakhartchenko A , Hiroshi Nagashima C , Nikolai Klymiuk A , Barbara Kessler A and Eckhard Wolf A C
+ Author Affiliations
- Author Affiliations

A Chair for Molecular Animal Breeding and Biotechnology, Centre for Innovative Medical Models (CiMM), LMU Munich, Hacker strasse 27, 85764 Oberschleissheim, Germany.

B Klinikum Rechts der Isar, Innere Medizin I, TU Munich, Ismaninger strasse 22, 81675 Munich, Germany.

C Meiji University International Institute for Bio-Resource Research, 1-1-1 Higashimita, Tama, Kawasaki, Kanagawa 214-8571, Japan.

D Corresponding author. Email: m.kurome@gen.vetmed.uni-muenchen.de

Reproduction, Fertility and Development 31(4) 820-826 https://doi.org/10.1071/RD18120
Submitted: 28 March 2018  Accepted: 20 September 2018   Published: 2 November 2018

Abstract

Immunosurgical isolation of the inner cell mass (ICM) from blastocysts is based on complement-mediated lysis of antibody-coated trophectoderm (TE) cells. Conventionally, anti-species antisera, containing antibodies against multiple undefined TE-cell epitopes, have been used as the antibody source. We previously generated α-1,3-galactosyltransferase deficient (GTKO) pigs to prevent hyperacute rejection of pig-to-primate xenotransplants. Since GTKO pigs lack galactosyl-α-1,3-galactose (αGal) but are exposed to this antigen (e.g. αGal on gut bacteria), they produce anti-αGal antibodies. In this study, we examined whether serum from GTKO pigs could be used as a novel antibody source for multi-species embryo immunosurgery. Mouse, rabbit, pig and cattle blastocysts were used for the experiment. Expression of αGal epitopes on the surface of TE cells was detected in blastocysts of all species tested. GTKO pig serum contained sufficient anti-αGal antibodies to induce complement-mediated lysis of TE cells in blastocysts from all species investigated. Intact ICMs could be successfully recovered and the majority showed the desired level of purity. Our study demonstrates that GTKO pig serum is a reliable and effective source of antibodies targeting the αGal epitopes of TE cells for multi-species embryo immunosurgery.

Additional keywords: α-1,3-galactosyltransferase deficient pigs, anti-αGal antibodies, complement, inner cell mass isolation.


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