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Energy balancing by fat Pik3ca.

Victoria Lb Nelson1, Lisa M Ballou1, Richard Z Lin2

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Mice lacking adipose phosphoinositide 3-kinase (PI3K) signaling developed obesity and metabolic dysfunction due to reduced brown fat activity and energy expenditure. This highlights PI3K

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Area of Science:

  • Metabolic research
  • Endocrinology
  • Obesity research

Background:

  • Obesity is linked to insulin resistance, a key factor in metabolic disease progression.
  • Adipose tissue plays a critical role in regulating systemic glucose and lipid homeostasis.
  • Phosphoinositide 3-kinase (PI3K) signaling in adipose tissue is crucial for metabolic health.

Purpose of the Study:

  • To investigate the role of adipose-specific p110α PI3K catalytic subunit in regulating body weight and metabolic homeostasis.
  • To model insulin resistance in adipose tissue using a genetically modified mouse.
  • To understand the link between PI3K signaling, obesity, and pubertal development.

Main Methods:

  • Generated a mouse model with adipose-specific ablation of the p110α PI3K catalytic subunit.
  • Analyzed phenotypes related to body weight, glucose, and lipid metabolism.
  • Assessed brown adipose tissue gene expression, respiration, and energy expenditure.
  • Investigated the impact on pubertal development and hormonal profiles.

Main Results:

  • Loss of adipose p110α PI3K reduced brown adipose tissue gene expression and cellular respiration.
  • Reduced brown fat activity led to decreased energy expenditure, promoting obesity and hepatic lipid deposition.
  • Adiposity was not affected until sexual maturation, suggesting a link to pubertal development.
  • Elevated leptin levels in knockout mice potentially delayed pubertal development.

Conclusions:

  • Adipose PI3K signaling is essential for regulating energy expenditure and preventing obesity.
  • Impaired PI3K signaling in adipose tissue contributes to systemic metabolic dysfunction.
  • The onset of obesity linked to adipose PI3K loss may be associated with pubertal development and prepubescent insulin sensitivity.