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Related Experiment Video

Updated: Jun 29, 2025

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Involution of brown adipose tissue through a Syntaxin 4 dependent pyroptosis pathway.

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  • 1Department of Medicine, Albert Einstein College of Medicine, Bronx, NY, 10461, USA.

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Aging causes brown adipose tissue (BAT) loss. Restoring syntaxin 4 (STX4) or inhibiting pyroptosis prevents this decline, revealing a key mechanism in thermogenic dysfunction.

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Area of Science:

  • Metabolism
  • Cell Biology
  • Aging Research

Background:

  • Brown adipose tissue (BAT) involution, marked by reduced mass and function, occurs with aging, high-fat diets, or thermoneutral housing.
  • This involution involves increased lipid droplet size and a specific Ucp1-low brown adipocyte population exhibiting pyroptosis and reduced syntaxin 4 (STX4).

Purpose of the Study:

  • To investigate the role of STX4 and pyroptosis in brown adipose tissue involution during aging and thermogenic dysfunction.
  • To identify mechanisms linking STX4 deficiency to impaired BAT function and pyroptosis.

Main Methods:

  • Single nuclei RNA sequencing of aged mouse BAT.
  • Genetic manipulation (Ucp1-STX4KO mice) to study STX4 deficiency.
  • Assessment of BAT mass, thermogenic activity, pyroptosis markers, and metabolic pathways (oxidative phosphorylation, glucose uptake, glycolysis).

Main Results:

  • Aged brown adipocytes and Ucp1-STX4KO mice exhibit reduced BAT mass, thermogenic dysfunction, and increased pyroptosis.
  • Restoring STX4 expression or suppressing pyroptosis ameliorates age-related BAT decline and dysfunction.
  • STX4 deficiency impairs oxidative phosphorylation, glucose uptake, and glycolysis, leading to decreased ATP levels and triggering pyroptosis.

Conclusions:

  • Physiological aging and thermogenic dysfunction are driven by pyroptotic signaling activation in brown adipocytes.
  • STX4 plays a crucial role in maintaining BAT mass and function, and its deficiency promotes involution via pyroptosis.
  • Targeting pyroptosis or restoring STX4 offers potential therapeutic strategies for age-related metabolic decline.