Hyperglycemia reduces mitochondrial content and glucose transporter expression in mouse embryos developing in vitro

Area of Science:

• Developmental Biology
• Reproductive Science
• Metabolic Research

Background:

• Hyperglycemia is a condition associated with metabolic disorders.
• The impact of high glucose on early embryonic development requires further investigation.
• Understanding glucose metabolism in embryos is crucial for reproductive health.

Purpose of the Study:

• To investigate the effects of high glucose concentrations on in vitro mouse embryo development.
• To analyze embryo viability, mitochondrial content, and glucose transporter expression under hyperglycemic conditions.

Main Methods:

• Mouse embryos at the two-cell stage were cultured in media with high glucose concentrations (25 mM and 55 mM).
• Embryo development, cell count, and apoptosis were assessed.
• Quantitative reverse transcriptase PCR (RT-PCR), miRNA analysis, and MitoTracker Green fluorescence were employed to measure gene expression, miRNA levels, and mitochondrial mass.

Main Results:

• High glucose significantly reduced morula and blastocyst formation, leading to fewer cells and increased apoptosis in blastocysts.
• Apoptosis-related gene expression (Bax, Casp3) increased, while mitochondrial mass and expression of mitochondrial genes (Cox1, Cox2) decreased.
• Expression of glucose transporters (Glut1, Glut3) and protein synthesis were reduced under high glucose conditions.

Conclusions:

• Hyperglycemia negatively impacts mouse embryo development in vitro.
• High glucose reduces mitochondrial content and glucose transporter expression, potentially leading to increased apoptosis.
• These findings highlight the detrimental effects of hyperglycemia on early embryonic development.