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Apoptosis and active caspase-3 expression in human granulosa cells
Violeta Glamoclija1, Katarina Vilović, Mirna Saraga-Babić
1Department of Anatomy, Histology, and Embryology, School of Medicine, University of Split, Split, Croatia. vg@mefst.hr
Fertility and Sterility
|February 12, 2005
Summary
Activated caspase-3 indicates apoptosis in human granulosa cells, particularly in atretic follicles. This activation precedes DNA fragmentation, suggesting an earlier role in follicular atresia and luteinization.
Area of Science:
- Reproductive Biology
- Cell Biology
- Apoptosis Research
Background:
- Granulosa cells are crucial for ovarian follicle development and function.
- Apoptosis, or programmed cell death, plays a role in regulating cell populations within the ovary.
- Caspase-3 is a key executioner enzyme in the apoptotic pathway.
Purpose of the Study:
- To investigate the expression of activated caspase-3 in human granulosa cells.
- To determine the relationship between caspase-3 activation and apoptosis in granulosa cells.
- To correlate caspase-3 activation with follicular atresia and luteinization.
Main Methods:
- Laboratory study involving human ovarian tissues and granulosa cells from IVF patients.
- Immunostaining for activated caspase-3 and TUNEL assay for DNA fragmentation.
- Microscopic evaluation of cellular co-localization of markers.
Main Results:
- Apoptosis in granulosa cells was observed exclusively in atretic antral follicles.
- All morphologically apoptotic granulosa cells expressed activated caspase-3.
- TUNEL assay detected DNA fragmentation in only a subset of caspase-3 positive cells.
Conclusions:
- Caspase-3 dependent apoptosis is a normal physiological process in human granulosa cells during follicular atresia and luteinization.
- Caspase-3 activation appears to be an early event, preceding detectable DNA fragmentation.
- The expression of activated caspase-3 may serve as a more sensitive marker for early apoptosis than DNA fragmentation assays.