Abstract
The effects of various concentrations of nicotine on the in vitro development of 1-cell rabbit preimplantation embryos and on the DNA-synthesis of 4-day-old rabbit blastocysts are investigated. Exposure of rabbit preimplantation embryos to concentrations of nicotine higher than 1 × 10 −3 M results in a marked decrease in the invitro development and in DNA-synthesis. Concentrations of nicotine below 1 × 10 −3 M have no effect on these early embryos. It can be concluded that the concentrations of nicotine which exert a direct embryotoxic effect are higher than the concentrations that may be expected in the blood circulation of humans considered to be “normal smokers”.
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