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Related Experiment Videos

Validation of an embryotoxicity assay

R G Roussev1, J J Stern, L P Thorsell

  • 1Genetics & IVF Institute, VA 22031, USA.

American Journal of Reproductive Immunology (New York, N.Y. : 1989)
|February 1, 1995
PubMed
Summary

This study refined a mouse blastocyst assay to identify embryotoxic factors in human serum, crucial for understanding recurrent spontaneous abortion (RSA). The improved method identified a subgroup of RSA patients with significant embryotoxic activity.

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Area of Science:

  • Reproductive biology and toxicology
  • In vitro embryo development assays
  • Idiopathic recurrent spontaneous abortion (RSA) research

Background:

  • Mouse blastocyst culture is a validated method for detecting embryotoxic agents in human serum.
  • Sera from women with recurrent spontaneous abortion (RSA) have demonstrated inhibitory effects on in vitro mouse blastocyst development.
  • High variability in previous assays limited the classification of idiopathic RSA.

Purpose of the Study:

  • To reduce variability in the mouse blastocyst bioassay for identifying embryotoxic factors in human serum.
  • To improve the reliability of the assay for classifying idiopathic recurrent spontaneous abortion (RSA).
  • To identify a specific subgroup of RSA patients exhibiting embryotoxic activity.

Main Methods:

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  • Collected two-cell mouse embryos from superovulated CB6F1/J mice.
  • Cultured embryos in Ham's F-10 media supplemented with fetal bovine serum (FBS) or tested human serum.
  • Assayed serum samples in triplicate, using at least five embryos per mouse donor, and evaluated development at 72 hours.

Main Results:

  • Achieved low interassay (9%) and interoperator (4%) variability through standardized methods.
  • Embryo atresia rates were 23% with FBS, 21% with pooled control serum, and 34.6% with RSA patient sera.
  • Established a 95% confidence interval threshold for atresia at 44.0%, identifying a significant difference in RSA patient sera.

Conclusions:

  • Controlling mouse variability by averaging atresia percentages from multiple embryo donors per serum sample is critical for assay precision.
  • A subgroup of 24% of RSA patients exhibited significant embryotoxic activity.
  • The refined assay demonstrated 95% specificity and an 83% positive predictive value for identifying embryotoxic activity in RSA patients.