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Ovulation efficiency is reduced in mice that lack plasminogen activator gene function: functional redundancy among
G Leonardsson1, X R Peng, K Liu
1Department of Medical Biochemistry and Biophysics, Umeå University, Sweden.
Summary
Plasminogen activators (PAs) are crucial for ovulation. While single deficiencies in tissue-type plasminogen activator (tPA) or urokinase-type plasminogen activator (uPA) had normal ovulation, combined deficiency reduced efficiency by 26%.
Area of Science:
- Reproductive biology
- Molecular endocrinology
- Protease function
Background:
- Plasminogen activation is implicated in follicular wall degradation during ovulation.
- Previous studies showed normal reproduction in single-deficient mice for tPA, uPA, or PAI-1, but reduced fertility in combined tPA/uPA deficiency.
Purpose of the Study:
- To investigate the role of plasminogen activators (PAs) in ovulation efficiency.
- To determine if reduced fertility in PA-deficient mice is due to impaired ovulation mechanisms.
Main Methods:
- Ovulation efficiency was assessed in 25-day-old mice undergoing gonadotropin-induced ovulation.
- Analysis included mice with single deficiencies of tPA or uPA, and combined deficiency of both PAs.
Main Results:
- Ovulation efficiency was normal in mice with single tPA or uPA deficiencies.
- A significant 26% reduction in ovulation efficiency was observed in mice lacking both tPA and uPA.
- No compensatory upregulation of the remaining PA was detected.
Conclusions:
- Plasminogen activation plays a role in the ovulatory response, but neither tPA nor uPA is essential individually or combined.
- Functional redundancy exists between tPA and uPA during ovulation.
- PAs, along with other proteases, contribute to the proteolytic activity needed for follicular wall degradation.