Obesity in Yap transgenic mice is associated with TAZ downregulation

Area of Science:

• Cell Biology
• Metabolic Diseases
• Molecular Endocrinology

Background:

• Obesity involves white adipose tissue (WAT) expansion driven by adipocyte proliferation and differentiation.
• Peroxisome proliferator-activated receptor gamma (PPARγ) is a key regulator of adipogenesis, influenced by its coregulator TAZ.
• The in vivo role of TAZ in adipogenesis remains less understood compared to in vitro studies.

Purpose of the Study:

• To investigate the in vivo function of TAZ in adipocyte differentiation and adipose tissue expansion.
• To elucidate the molecular mechanisms linking YAP, TAZ, and PPARγ in adipogenesis.
• To explore the therapeutic potential of targeting TAZ for obesity treatment.

Main Methods:

• Generation and analysis of a Yap transgenic mouse model with altered TAZ levels.
• Investigation of Hippo signaling pathway activation and feedback mechanisms.
• Assessment of TAZ localization and PPARγ activity in adipose stem cells.
• Evaluation of adipose tissue mass and adipocyte differentiation in vivo.

Main Results:

• Yap overexpression induced a feedback loop that suppressed TAZ levels and nuclear localization.
• TAZ downregulation in adipose stem cells activated PPARγ.
• This activation promoted adipocyte differentiation and WAT expansion in the Yap transgenic mice.
• The study established a novel obese mouse model linked to TAZ downregulation.

Conclusions:

• TAZ is essential for in vivo adipocyte commitment and differentiation.
• YAP-mediated Hippo signaling feedback regulates TAZ levels, impacting adipogenesis.
• Targeting TAZ may offer a novel therapeutic strategy for managing obesity.