FoxO transcription factors 1 regulate mouse preimplantation embryo development

Area of Science:

• Developmental Biology
• Molecular Biology
• Genetics

Background:

• FoxO transcription factors play roles in various cellular processes, including cell cycle regulation, apoptosis, and stress resistance.
• Understanding the role of FoxO factors in early embryonic development is essential for reproductive biology.

Purpose of the Study:

• To investigate the role of FoxO1, FoxO3, and FoxO4 transcription factors in mouse preimplantation embryo development.
• To assess the impact of FoxO knockdown on cell cycle arrest and apoptosis-related proteins (p53, p21, FASL, cleaved caspase 3).
• To evaluate the effect of resveratrol on embryo development and protein expression following FoxO knockdown.

Main Methods:

• Gene knockdown of FoxO1, FoxO3, and FoxO4 in two-cell mouse embryos using siRNA.
• Confirmation of knockdown at gene and protein levels using RT-PCR, qRT-PCR, and immunofluorescence.
• Assessment of embryo developmental competence, expression of SIRT1, p53, p21, FASL, cleaved caspase 3, and ROS levels post-knockdown, with and without resveratrol treatment.

Main Results:

• Successful non-invasive siRNA-mediated knockdown of FoxO genes in mouse embryos was achieved.
• Knockdown of FoxO genes significantly impaired preimplantation embryo development.
• Resveratrol treatment protected embryos from cell cycle arrest and apoptosis but did not rescue developmental competence. FoxO proteins regulate apoptosis and cell cycle proteins, potentially via an autofeedback loop with SIRT1.

Conclusions:

• FOXO transcription factors are important for mouse preimplantation embryo development.
• Further investigation is warranted to determine the role of FOXO factors in human preimplantation embryo development and infertility.