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Mimicking the Function of Signaling Proteins: Toward Artificial Signal Transduction Therapy
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PCB126 Inhibits the Activation of AMPK-CREB Signal Transduction Required for Energy Sensing in Liver

Gopi S Gadupudi1,2, Benjamin A Elser1,2, Fabian A Sandgruber2

  • 1Interdisciplinary Graduate Program in Human Toxicology, Graduate College, The University of Iowa, Iowa City, Iowa.

Toxicological Sciences : an Official Journal of the Society of Toxicology
|February 24, 2018
PubMed

Insights

3,3

Area of Science:

  • Biochemistry
  • Toxicology
  • Metabolic Disorders

Background:

  • Dioxin-like polychlorinated biphenyls (PCBs), such as PCB126, induce toxicity via noncarcinogenic effects.
  • Previous studies indicated decreased gluconeogenic enzyme transcription preceding lipid accumulation.

Purpose of the Study:

  • To investigate the impact of reduced gluconeogenic enzymes on liver metabolism, growth, and weight following extended PCB126 exposure.
  • To elucidate the mechanisms behind PCB126-induced metabolic disruption during fasting.

Main Methods:

  • Male Sprague Dawley rats were administered a single dose of PCB126 or vehicle.
  • Rats were maintained on a defined diet for 28 days, with a subset undergoing a 12-hour fast.
  • Hepatic gene expression, glucose production, and signaling pathways (AMPK, CREB) were analyzed.

Main Results:

  • PCB126 exposure led to significant weight loss and mortality.
  • Downregulation of gluconeogenic and glycogenolytic enzymes was observed, exacerbating hypoglycemia during fasting.
  • PCB126 induced hepatic steatosis, decreased Pparα expression, and inhibited AMPK/CREB signaling.

Conclusions:

  • Extended PCB126 exposure disrupts hepatic glucose and lipid metabolism by inhibiting key enzymes and signaling pathways.
  • PCB126 triggers a metabolic crisis in the liver, impairing the response to energy deprivation.

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