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Dithiothreitol prevents age-associated decrease in oocyte/conceptus viability in vitro

J J Tarín1, J Ten, F J Vendrell

  • 1Department of Paediatrics, Obstetrics and Gynaecology, Faculty of Medicine, University of Valencia, Spain.

Human Reproduction (Oxford, England)
|April 29, 1998
PubMed
Summary
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Antioxidant therapy was tested to prevent negative effects of aged oocytes on reproductive potential. DL-dithiothreitol (DTT) partially prevented fragmentation and improved blastocyst development in aged mouse oocytes.

Area of Science:

  • Reproductive Biology
  • Cellular Aging
  • Antioxidant Research

Background:

  • Post-ovulatory oocyte aging in vitro negatively impacts reproductive potential.
  • Cellular fragmentation and reduced blastocyst development are key indicators of oocyte aging.
  • Investigating antioxidant interventions is crucial for improving oocyte quality.

Purpose of the Study:

  • To evaluate the efficacy of various antioxidants in preventing negative effects of in vitro oocyte aging.
  • To determine if antioxidant therapy can rescue fertilization rates and developmental potential of aged oocytes.
  • To identify specific antioxidants that mitigate cellular fragmentation and improve blastocyst formation.

Main Methods:

  • Mouse metaphase II oocytes were aged in vitro for 12 hours.

Related Experiment Videos

  • Oocytes were treated with L-ascorbic acid, Trolox, L-cystine, EDTA, beta-mercaptoethanol, and DL-dithiothreitol (DTT).
  • Fertilization rates, 24-hour fragmentation, and 81-hour blastocyst development were assessed.

    • Main Results:

    • L-cystine and beta-mercaptoethanol decreased blastocyst development potential.
    • Beta-mercaptoethanol (500 microM) partially prevented age-associated fragmentation.
    • DL-dithiothreitol (DTT) at 50 and 500 microM improved fertilization and cell number.
    • DTT (50 microM) prevented fragmentation and improved blastocyst development in aged oocytes.

    Conclusions:

    • DL-dithiothreitol (DTT) shows significant potential in protecting aged oocytes from detrimental effects.
    • DTT may exert its protective effects by preventing thiol oxidation or modulating redox-dependent pathways.
    • Further research is needed to elucidate the precise mechanisms of DTT's beneficial action on oocyte aging.