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Updated: May 9, 2026
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Human Egg Maturity Assessment and Its Clinical Application
Published on: August 19, 2019
Bisphenol-A and human oocyte maturation in vitro.
Ronit Machtinger1, Catherine M H Combelles, Stacey A Missmer
1Department of Obstetrics, Gynecology and Reproductive Biology, Brigham & Women's Hospital and Harvard Medical School, Boston, MA, USA.
Human Reproduction (Oxford, England)
|August 2, 2013
Summary
Exposure to bisphenol-A (BPA) negatively impacts human oocyte maturation. Increased BPA levels were associated with reduced maturation rates, increased degeneration, and abnormal spindle and chromosome configurations in vitro.
Area of Science:
- Reproductive Biology
- Environmental Health
- Toxicology
Background:
- Bisphenol-A (BPA) is a widespread environmental contaminant found in human follicular fluid.
- Animal studies suggest BPA exposure disrupts oocyte maturation, causing arrest and spindle abnormalities.
Purpose of the Study:
- To investigate the effect of varying bisphenol-A (BPA) concentrations on human oocyte maturation in vitro.
- To assess BPA's impact on meiotic progression, spindle morphology, and chromosome alignment.
Main Methods:
- A randomized trial involving 352 clinically discarded human oocytes from 121 patients undergoing IVF/ICSI.
- Oocytes were cultured in media with varying BPA concentrations (20, 200 ng/ml, 20 µg/ml) or without BPA.
- Immunofluorescence and confocal microscopy were used to evaluate meiotic stage, spindle configuration, and chromosome alignment.
Main Results:
- A dose-dependent decrease in oocyte progression to metaphase II (MII) was observed with increasing BPA levels.
- Higher BPA concentrations led to increased oocyte degeneration and spontaneous activation.
- Significant trends of decreased bipolar spindles and chromosome alignment were noted in MII oocytes exposed to BPA.
Conclusions:
- Bisphenol-A (BPA) exposure is dose-responsively associated with impaired human oocyte maturation in vitro.
- Findings suggest BPA negatively influences oocyte cell cycle progression, spindle architecture, and chromosome organization.
- These abnormalities may contribute to the observed decline in fertility rates.
