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The Journal of Immunology, Vol 140, Issue 12 4157-4159, Copyright © 1988 by American Association of Immunologists

ARTICLES

Lack of HLA class I and class II antigens on human preimplantation embryos

G Desoye, GA Dohr, W Motter, R Winter, W Urdl, H Pusch, B Uchanska-Ziegler and A Ziegler
Department of Obstetrics and Gynecology, KF University, Graz, Austria.

The expression of HLA Ag on polyploid early human embryonic stages, obtained in an in vitro fertilization and embryo transfer program, was investigated by indirect immunofluorescence tests using a panel of mAb. Neither HLA class I Ag, beta 2-microglobulin, nor HLA class II molecules could be detected on blastomers. The zona pellucida also lacked these Ag, but granulosa cells expressed HLA class I Ag, beta 2- microglobulin, and HLA class II Ag. These results make it likely that the absence of HLA Ag is one of the mechanisms involved in protecting the implanting embryo from rejection by the immunocompetent mother.


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