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PPAR-alpha: a key to the mechanism of hepatoprotection by clofibrate

H M Mehendale1

  • 1Department of Toxicology, College of Pharmacy, The University of Louisiana at Monroe, 700 University Avenue, Monroe, Louisiana 71209, USA.

Toxicological Sciences : an Official Journal of the Society of Toxicology
|September 28, 2000
PubMed

Insights

Peroxisome proliferator-activated receptor alpha (PPARα)-null mice did not gain protection against acetaminophen-induced liver injury after clofibrate treatment. This suggests PPARα is crucial for the protective effects of fibrates against drug-induced liver damage.

Area of Science:

  • Hepatotoxicity Research
  • Pharmacology
  • Toxicology

Background:

  • Acetaminophen overdose is a leading cause of acute liver failure.
  • Fibrate drugs, like clofibrate, are known to protect against acetaminophen-induced liver injury.
  • Peroxisome proliferator-activated receptor alpha (PPARα) is a key mediator of fibrate action.

Purpose of the Study:

  • To investigate the role of PPARα in mediating the protective effects of clofibrate against acetaminophen hepatotoxicity.
  • To determine if PPARα-null mice exhibit altered susceptibility to acetaminophen-induced liver injury.

Main Methods:

  • Acetaminophen-induced liver injury model in wild-type and PPARα-null mice.
  • Administration of clofibrate prior to acetaminophen challenge.
  • Assessment of liver injury markers (ALT, AST), oxidative stress, and inflammatory responses.

Main Results:

  • PPARα-null mice showed no resistance to acetaminophen hepatotoxicity after clofibrate exposure.
  • Clofibrate treatment did not reduce liver injury in PPARα-null mice, unlike in wild-type controls.
  • Key pathways involved in hepatoprotection were not activated in PPARα-null mice.

Conclusions:

  • PPARα is essential for the hepatoprotective effects of clofibrate against acetaminophen-induced liver injury.
  • Targeting PPARα may be a strategy to enhance protection against drug-induced liver damage.

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