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Programmed cell death-4 deficiency prevents diet-induced obesity, adipose tissue inflammation, and insulin resistance

Qun Wang1, Zhaojing Dong, Xianglan Liu

  • 1Department of Immunology, Shandong University School of Medicine, Jinan, Shangdong, China.

Diabetes
|August 31, 2013
PubMed

Insights

Programmed cell death-4 (PDCD4) deficiency surprisingly protected mice from obesity and insulin resistance. PDCD4 inhibition improved energy expenditure and reduced inflammation, suggesting PDCD4 as a potential therapeutic target for metabolic diseases.

Area of Science:

  • Metabolic disease research
  • Cellular and molecular biology
  • Inflammation and immunology

Background:

  • Programmed cell death-4 (PDCD4) is a protein translation inhibitor with known proinflammatory effects.
  • The specific role of PDCD4 in the development of obesity and associated metabolic dysfunction remains largely uncharacterized.

Purpose of the Study:

  • To investigate the impact of PDCD4 on diet-induced obesity, inflammation, and insulin resistance.
  • To elucidate the molecular mechanisms underlying PDCD4's influence on metabolic homeostasis.

Main Methods:

  • Utilized high-fat diet (HFD)-fed wild-type and PDCD4-deficient (PDCD4(-/-)) mice.
  • Assessed phenotypic changes including body weight, fat mass, energy expenditure, and insulin sensitivity.
  • Analyzed white adipose tissue (WAT) for macrophage infiltration, inflammatory cytokine levels, and endoplasmic reticulum stress.
  • Investigated the expression of liver X receptor-alpha (LXR-α) and its downstream targets.

Main Results:

  • PDCD4(-/-) mice exhibited a lean phenotype and improved insulin sensitivity on an HFD.
  • These mice displayed increased energy expenditure, reduced WAT inflammation, and alleviated hepatic steatosis.
  • PDCD4 deficiency led to elevated LXR-α expression and its target genes, improving lipid metabolism and reducing ER stress in WAT.

Conclusions:

  • PDCD4 deficiency confers protection against diet-induced obesity, adipose tissue inflammation, and insulin resistance.
  • This protective effect is mediated by the restoration of LXR-α expression and improved lipid homeostasis.
  • PDCD4 emerges as a promising therapeutic target for managing obesity and related metabolic disorders.

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