Follicular expression of a human beta-cell leukaemia/lymphoma-2 (Bcl-2) transgene does not decrease atresia or...

Area of Science:

• Reproductive Biology
• Molecular Endocrinology
• Genetics

Background:

• Ovarian follicle atresia is a major determinant of female fertility.
• Bcl-2 is a key anti-apoptotic protein that can inhibit programmed cell death.
• Modulating Bcl-2 expression is a potential strategy to improve reproductive outcomes.

Purpose of the Study:

• To investigate the effect of ectopic Bcl-2 expression in porcine ovaries on follicle atresia and ovulation rate.
• To determine if overexpressing Bcl-2 in granulosa and theca cells can prevent follicular apoptosis.

Main Methods:

• Production of transgenic gilts carrying human Bcl-2 cDNA under the control of the inhibin-alpha subunit promoter.
• Immunohistochemical analysis to detect Bcl-2 protein expression in ovarian follicles.
• Real-time RT-PCR to confirm transgene expression.
• Assessment of atresia rates and ovulation rates in transgenic and non-transgenic gilts.

Main Results:

• Bcl-2 transgene protein was successfully expressed in granulosa and theca cells of transgenic gilts' follicles.
• No significant difference in the rate of follicle atresia was observed between transgenic and non-transgenic gilts.
• Ovulation rates were comparable between transgenic and non-transgenic gilts.

Conclusions:

• Ectopic expression of Bcl-2 in porcine ovaries did not reduce follicle atresia or enhance ovulation rate.
• The lack of effect may be due to the involvement of other cell death pathways or insufficient neutralization of the mitochondrial pathway.
• Further research is needed to elucidate the precise molecular mechanisms underlying follicular atresia and the role of Bcl-2 in vivo.