Early B Cell Factor Activity Controls Developmental and Adaptive Thermogenic Gene Programming in Adipocytes.

Area of Science:

• Metabolism and Endocrinology
• Cellular Biology
• Molecular Genetics

Background:

• Brown adipose tissue (BAT) is vital for thermogenesis, protecting against hypothermia and offering a target for obesity treatment.
• Early B cell factor-2 (EBF2) is known to promote brown adipocyte differentiation, but its role in maintaining BAT function and cold response was unclear.

Purpose of the Study:

• To investigate the role of EBF2 in maintaining brown adipocyte fate and function.
• To explore the involvement of EBF proteins in the adaptive response of BAT to cold exposure.

Main Methods:

• Utilized mouse models with adipocyte-specific deletion of Ebf2.
• Performed enhancer profiling and genetic assays to identify regulatory factors.
• Analyzed BAT character, function, and thermogenic gene expression under varying cold conditions.

Main Results:

• Deletion of Ebf2 in adipocytes led to loss of BAT character and function, causing cold intolerance.
• Prolonged cold exposure partially restored thermogenic function in Ebf2 mutant BAT.
• EBF1 was identified as a key regulator of the cold response in BAT.
• Combined deletion of Ebf1 and Ebf2 abolished BAT recruitment during chronic cold exposure.
• EBF1 and EBF2 were shown to enhance thermogenic gene transcription via ERRα and PGC1α.

Conclusions:

• EBF proteins are essential for specifying brown adipocyte developmental fate.
• EBF proteins play a critical role in controlling the adaptive cold response of brown adipocytes.
• EBF proteins regulate BAT recruitment and function through the ERRα and PGC1α pathways.