Oocyte spontaneous activation in different rat strains.
P J Ross1, A Yabuuchi, J B Cibelli
1Cellular Reprogramming Laboratory, Department of Animal Science, Michigan State University, East Lansing, Michigan, USA.
Cloning and Stem Cells
|January 2, 2007
Summary
Differences in oocyte spontaneous activation (OSA) rates were found among rat strains. However, maturation promoting factor (MPF) activity remained consistent across strains during in vitro culture.
Area of Science:
- Reproductive Biology
- Developmental Biology
- Animal Science
Background:
- Oocyte spontaneous activation (OSA) is a phenomenon observed during in vitro oocyte culture.
- Variability in OSA rates among different rat strains has been anecdotally reported.
Purpose of the Study:
- To investigate and compare the incidence of oocyte spontaneous activation (OSA) across twelve different rat strains.
- To assess and compare the activity levels of maturation promoting factor (MPF) in oocytes from these strains during in vitro culture.
Main Methods:
- Twelve rat strains were utilized, with females undergoing superovulation and oocyte collection post-hCG injection.
- Denuded oocytes were cultured in M16 medium for 6 hours to determine OSA rates.
- Maturation promoting factor (MPF) activity was quantified at 0, 1.5, and 3 hours post-collection using established assays.
Main Results:
- Significant inter-strain variations (p < 0.01) were identified in the rates of oocyte spontaneous activation (OSA).
- No statistically significant differences (p > 0.3) in maturation promoting factor (MPF) activity were detected among the tested rat strains at any measured time point.
Conclusions:
- Rat strain is a significant factor influencing the rate of oocyte spontaneous activation (OSA) during in vitro culture.
- Maturation promoting factor (MPF) activity does not appear to be strain-dependent under the conditions studied, suggesting other regulatory mechanisms for OSA.
