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Ovulation in plasminogen-deficient mice
A Ny1, G Leonardsson, A C Hägglund
1Department of Medical Biosciences, Medical Biochemistry, Umeå University, Sweden.
Endocrinology
|October 28, 1999
Summary
Plasminogen-deficient mice show normal ovulation, indicating plasmin is not essential for follicular rupture. Other mechanisms may compensate for plasmin
Area of Science:
- Reproductive Biology
- Molecular Biology
- Biochemistry
Background:
- Plasmin, derived from plasminogen, is suggested to be vital for follicular wall degradation during ovulation.
- The precise physiological role of plasmin in ovulation remains to be fully elucidated.
Purpose of the Study:
- To investigate the physiological significance of plasmin in the ovulation process.
- To determine if plasmin is essential for follicular rupture and efficient ovulation.
Main Methods:
- Utilized plasminogen-deficient mice to assess ovulation efficiency.
- Evaluated ovulation in both a gonadotropin-induced ovulation model and during natural physiological ovulation.
- Measured ovulation efficiency by counting released ova per mouse.
Main Results:
- Follicular rupture onset was not delayed in plasminogen-deficient mice during induced ovulation.
- A non-significant trend towards reduced ovulation efficiency (13%) was observed in deficient mice, possibly linked to maturation delays.
- Adult plasminogen-deficient mice exhibited normal ovulation efficiency during physiological ovulation.
Conclusions:
- Plasmin is not required for efficient follicular rupture or activation of other proteases during ovulation under the studied conditions.
- The absence of plasmin may be compensated by alternative mechanisms during ovulation.
- Further research may clarify the compensatory pathways involved in ovulation.