NAMPT regulates mitochondria and oxidative stress level for mouse early embryo development

Area of Science:

• Developmental Biology
• Cellular Metabolism

Background:

• Nicotinamide phosphoribosyltransferase (NAMPT) is key in NMN-NAD+ synthesis, impacting aging, immunity, and neurodegeneration.
• Its specific role in early embryonic development remains largely unknown.

Purpose of the Study:

• To investigate the function of NAMPT during early mouse embryo development.
• To explore the impact of disturbed NAMPT activity on embryonic cell processes.

Main Methods:

• Examined NAMPT mRNA levels and protein localization in mouse embryos.
• Disrupted NAMPT activity and observed effects on early embryonic cleavage.
• Utilized immunofluorescence staining and live cell imaging.

Main Results:

• NAMPT mRNA levels were stable, with protein accumulating in the nucleus.
• Reduced NAMPT activity impaired cleavage from zygote to 2-cell and 4-cell to morula stages.
• NAMPT inhibition disrupted mitochondrial function, increased reactive oxygen species (ROS), and elevated apoptosis.

Conclusions:

• NAMPT is essential for maintaining mitochondrial function during early mouse embryo development.
• NAMPT plays a critical role in controlling oxidative stress and apoptosis in developing embryos.