Zfp238 Regulates the Thermogenic Program in Cooperation with Foxo1

Area of Science:

• Metabolic research
• Obesity research
• Adipose tissue biology

Background:

• Obesity is a major public health issue linked to metabolic syndrome.
• Beige adipocytes play a crucial role in regulating energy expenditure.
• Understanding the molecular mechanisms controlling energy balance is vital.

Purpose of the Study:

• To investigate the role of Zfp238 in adipose tissue and its involvement in energy expenditure.
• To identify Zfp238 as a co-repressor of Foxo1.
• To elucidate the impact of Zfp238 on the thermogenic program.

Main Methods:

• Yeast two-hybrid screening to identify protein interactions.
• Generation of adipose-tissue-specific Zfp238 knockout (Adipo-Zfp238KO) mice.
• Analysis of energy expenditure, insulin resistance, and Ucp1 expression in mice and 3T3-L1 cells.
• Gene knockdown and overexpression studies in cell culture.

Main Results:

• Zfp238 was identified as a Foxo1 co-repressor.
• Adipo-Zfp238KO mice exhibited obesity, reduced energy expenditure, and insulin resistance.
• Zfp238 deficiency impaired Ucp1 induction in subcutaneous adipose tissue.
• Zfp238 modulated Ucp1 expression in 3T3-L1 cells, with knockdown decreasing and overexpression increasing it.
• Simultaneous knockdown of Zfp238 and Foxo1 restored Ucp1 induction.

Conclusions:

• Zfp238 is a key regulator of the thermogenic program in adipose tissue.
• Zfp238 functions in cooperation with Foxo1 to control energy expenditure.
• Targeting Zfp238 may offer therapeutic potential for obesity and related metabolic disorders.