Pifithrin-α ameliorates resveratrol-induced two-cell block in mouse preimplantation embryos in vitro

Area of Science:

• Reproductive biology
• Developmental toxicology
• Molecular biology

Background:

• Resveratrol, a natural polyphenol, has demonstrated varied biological effects.
• Its impact on early embryonic development and the underlying molecular mechanisms remain incompletely understood.
• Identifying reproductive toxins and their countermeasures is crucial for reproductive health.

Purpose of the Study:

• To investigate the effects of resveratrol on mouse embryo development.
• To elucidate the molecular pathways involved in resveratrol-induced embryonic developmental arrest.
• To evaluate the potential of p53 inhibition as a protective strategy against resveratrol toxicity.

Main Methods:

• Mouse embryos were treated with varying concentrations of resveratrol.
• Embryo morphology was assessed using bromodeoxyuridine assay and acridine orange/ethidium bromide staining.
• Gene expression analysis (mRNA) and immunofluorescence for active p53 were performed.
• The effect of pifithrin-α, a p53 inhibitor, was evaluated.

Main Results:

• Resveratrol at >0.5 μmol/L arrested mouse embryo development at the two-cell stage.
• Resveratrol significantly upregulated pro-apoptotic genes (p53, p21, Bax, Bak1, Noxa) and downregulated cell cycle regulators (Cullin 3, Cdk1).
• Active p53 accumulated in the nucleus of arrested embryos; pifithrin-α pretreatment reduced active p53 and ameliorated developmental defects by ~50%.

Conclusions:

• Resveratrol induces cytotoxicity in early mouse embryos, leading to developmental arrest at the two-cell stage.
• The p53 signaling pathway plays a critical role in resveratrol-induced embryonic developmental defects.
• Pifithrin-α demonstrates cytoprotective potential against resveratrol toxicity, suggesting its utility as an antidote for reproductive toxins.