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Related Experiment Videos

Improved methods for blastocyst formation and culture.

Y Ménézo1, A Veiga, M Benkhalifa

  • 1Laboratoire de Cytogénétique et de Procréation Médicalement Assistée, Bron, France.

Human Reproduction (Oxford, England)
|March 26, 1999
PubMed
Summary
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Blastocyst transfer in in-vitro fertilization (IVF) improves pregnancy rates. Early single-medium culture yielded poor results, but co-culture significantly improved blastocyst formation and implantation rates, paving the way for sequential media use.

Area of Science:

  • Reproductive biology
  • Embryology
  • In-vitro fertilization (IVF)

Background:

  • Blastocyst stage transfer is theorized to enhance pregnancy rates in IVF.
  • Initial single-medium culture methods resulted in low blastocyst formation and implantation rates.
  • Co-culture techniques emerged in the 1980s-1990s, improving embryo development.

Purpose of the Study:

  • To evaluate the effectiveness of different embryo culture media for blastocyst development and implantation in IVF.
  • To compare the outcomes of single-medium culture, co-culture, and sequential media approaches.

Main Methods:

  • Early experiments used single-medium culture from fertilization to blastocyst.
  • Subsequent studies employed co-culture with various cell types (tubal, granulosa, cell lines).

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  • Recent advancements involve sequential media, with different formulations for distinct developmental stages.

    • Main Results:

    • Single-medium culture led to disappointing blastocyst formation and implantation rates.
    • Co-culture significantly increased blastocyst formation (approx. 50%) and implantation rates (approx. 25%), yielding embryos with >200 cells.
    • Sequential media demonstrated comparable results to co-culture, suggesting a viable alternative.

    Conclusions:

    • Co-culture techniques substantially improved blastocyst development and implantation success in IVF.
    • Sequential media represent a promising and effective alternative to co-culture for human IVF.
    • Further adoption of sequential media in human IVF is recommended for improved outcomes.