PAR2 Deficiency Induces Mitochondrial ROS Generation and Dysfunctions, Leading to the Inhibition of Adipocyte...

Area of Science:

• Cell Biology
• Metabolism
• Endocrinology

Background:

• Protease-activated receptor 2 (PAR2), a G-protein-coupled receptor, influences calcium signaling.
• While PAR2 promotes obesity and adipose inflammation in high-fat diets, its role in adipocyte differentiation under basal conditions is unclear.

Purpose of the Study:

• To investigate the role of PAR2 in adipose tissue development and adipocyte differentiation under non-obesogenic conditions.
• To elucidate the underlying mechanisms involving mitochondrial function and calcium signaling.

Main Methods:

• Utilized PAR2-deficient mice and primary-cultured preadipocytes.
• Assessed adipocyte differentiation, protein expression, mitochondrial energy consumption, and calcium signaling pathways.
• Administered PAR2 agonists and antagonists to evaluate their effects.

Main Results:

• PAR2 deficiency in mice led to a mild lipodystrophy-like phenotype on a chow diet.
• PAR2-deficient preadipocytes showed reduced adipocyte differentiation and impaired mitochondrial energy consumption.
• PAR2 deficiency disrupted calcium-related signaling pathways essential for mitochondrial biogenesis.
• PAR2 antagonist treatment increased mitochondrial reactive oxygen species and reduced mitochondrial activity.

Conclusions:

• PAR2 plays a significant role in adipose tissue development under basal conditions.
• PAR2 regulates adipocyte differentiation and mitochondrial biogenesis through calcium signaling pathways.
• Targeting PAR2 may offer therapeutic strategies for metabolic disorders related to adipose tissue dysfunction.