Abstract
The high rate of implantation failure in humans following in vitro fertilization (IVF) has been attributed to a lack of production of immunosuppressive factors by cleaved embryos, rendering them vulnerable to maternal immune attack just before or around implantation. Systemic as well as blastocyst-secreted suppressor factors have been described and claimed to be responsible for successful pregnancy. Experimentally, we have screened in a double-blind fashion the suppressive activity of human embryo culture media (B2 Menezo system, France) in which zygotes after decoronization were individually cultured during 24 hr on lymphocyte proliferation as well as natural killer (NK) activity. Suppressive activity in media from cleaved and uncleaved ova did not differ significantly, and activity in media from transferred embryos was not correlated significantly with successful pregnancy. The implications of these data are discussed.
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Armstrong, D.T., Chaouat, G., Guichard, A. et al. Lack of correlation of immunosuppressive activity secreted by human in vitro fertilized (IVF) ova with successful pregnancy. J Assist Reprod Genet 6, 15–21 (1989). https://doi.org/10.1007/BF01134576
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DOI: https://doi.org/10.1007/BF01134576