Endogenous Fatty Acid Synthesis Drives Brown Adipose Tissue Involution.

Area of Science:

• Metabolic research
• Adipose tissue biology
• Molecular endocrinology

Background:

• Thermoneutral conditions cause brown adipose tissue (BAT) involution, marked by reduced mitochondrial content and increased lipids.
• Low BAT activity correlates with metabolic dysfunction, highlighting BAT reactivation as a therapeutic avenue.
• The molecular mechanisms driving BAT adaptation to thermoneutrality are not fully understood.

Purpose of the Study:

• To elucidate the molecular regulators of brown adipose tissue (BAT) involution under thermoneutral conditions.
• To investigate the role of endogenous fatty acid synthesis in BAT adaptive responses.
• To explore lipogenesis inhibition as a strategy for preserving BAT function.

Main Methods:

• Utilized metabolic and lipidomic analyses to study BAT adaptation.
• Investigated the function of carbohydrate-response element-binding protein (ChREBP) in regulating lipogenesis.
• Employed ChREBP deficiency and pharmacological lipogenesis inhibition in thermoneutral adaptation models.

Main Results:

• Endogenous fatty acid synthesis, controlled by ChREBP, is identified as a key regulator of BAT involution.
• ChREBP influences lipid abundance and composition, impacting organelle function and turnover.
• ChREBP deficiency or lipogenesis inhibition maintained mitochondrial mass and thermogenic capacity in BAT, independent of mitochondrial biogenesis.

Conclusions:

• Lipogenesis, regulated by ChREBP, centrally controls brown adipose tissue (BAT) involution.
• Targeting lipogenesis can prevent the loss of BAT thermogenic capacity observed in thermoneutral environments.
• Inhibition of fatty acid synthesis emerges as a potential therapeutic strategy for metabolic health.