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Tumor Suppressor Par-4 Regulates Complement Factor C3 and Obesity.

Nathalia Araujo1, James Sledziona1, Sunil K Noothi2

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|April 15, 2022
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Prostate apoptosis response-4 (Par-4) protein suppresses obesity by inhibiting fat absorption and storage in adipocytes. Loss of Par-4 activates p53, leading to increased fat accumulation and obesity risk in mice and humans.

Keywords:
C3Par-4acylation stimulating proteinadipocyte tissue storagefat absorptionhypertrophic obesity

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Area of Science:

  • Molecular biology
  • Metabolic research
  • Obesity research

Background:

  • Prostate apoptosis response-4 (Par-4) is a known tumor suppressor.
  • The physiological role of Par-4 in metabolic processes, particularly obesity, is not well understood.

Purpose of the Study:

  • To investigate the physiological function of Par-4 in the context of obesity.
  • To elucidate the molecular mechanisms by which Par-4 influences fat metabolism and adipocyte function.

Main Methods:

  • Generation and analysis of conventional and adipocyte-specific Par-4 knockout mouse models.
  • Investigation of molecular pathways involving mdm2, p53, and complement factor c3.
  • Correlation analysis of Par-4 expression in obese human subjects and longitudinal obesity risk assessment.

Main Results:

  • Par-4 knockout mice (conventional and adipocyte-specific) developed obesity on a standard diet, with increased fat absorption and storage.
  • Par-4 deficiency led to mdm2 downregulation, p53 activation, and upregulation of the p53-regulated gene c3 in adipocytes.
  • Re-expression of Par-4 or deletion of c3 reversed the obese phenotype in mice.
  • Obese humans exhibited lower Par-4 expression, and low baseline Par-4 levels predicted future obesity development.

Conclusions:

  • Par-4 acts as a suppressor of obesity by regulating fat storage in adipocytes.
  • The Par-4/p53/c3 pathway is a critical regulator of adipocyte function and systemic energy balance.
  • Par-4 deficiency is a risk factor for obesity in humans.