Effects on Mouse Blastocysts of in Vitro Exposure to Methylnitrosourea and 3-Methylcholanthrene

Philip M Iannaccone*, Twee Y. Tsao, Lucy Stols

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Mouse blastocysts were exposed in vitro to various concentrations of N-methyl-N-nitrosourea and 3-methylcholanthrene. The incorporation of [3H]thymidine, [3H]uridine, and [3H]leucine into the exposed blastocysts was determined either immediately following exposure or after 18 hr of culture. The concentrations of N-methyl-N-nitrosourea or 3-methylcholanthrene used had no effect on blastocyst viability in either situation. There was a concentration-dependent decrease in the incorporation of the precursors into blastocysts exposed to N-methyl-N-nitrosourea which appears to be more pronounced after 18 hr in culture. This effect was not demonstrated for 3-methylcholanthrene, which requires metabolic activation for reactivity. Blastocysts exposed to N-methyl-N-nitrosourea were injected into the uterine horns of surrogate mothers; a significant increase in the resorption rate of these blastocysts was seen when compared with controls. Similar experiments were performed to determine birth rate. A dose-dependent decrease in birth rate was observed which correlated well with the effects on incorporation of thymidine, uridine, and leucine but not with the effect on implantation rate. 9, 2016.

Original languageEnglish (US)
Pages (from-to)864-868
Number of pages5
JournalCancer Research
Issue number3
StatePublished - Mar 1 1982

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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