Effects of α-trichosanthin and α-momorcharin on the development of peri-implantation mouse embryos
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Summary. α-Trichosanthin (0·3 mg/25 g) and α-momorcharin (0·2 mg/25 g) given intraperitoneally to mice on Days 4 and 6 of pregnancy led to an inhibition of implantation. In-vitro study of the effects of these proteins on developing mouse embryos showed that these proteins did not affect the transformation of morulae to blastocysts but further development was impaired: many blastocysts failed to hatch from the zona, the incidence of successful attachment to a plastic substrate decreased and the extent of trophoblastic outgrowth diminished. Inner cell mass development was less affected than was the trophoblast. The in-vivo inhibition of implantation may therefore be a consequence of the deleterious effect of these proteins on the trophoblast.
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