Fenofibrate does not affect burn-induced hepatic endoplasmic reticulum stress

Area of Science:

• Biochemistry
• Metabolic pathways
• Liver function

Background:

• Burn injury induces significant metabolic derangements, including hypermetabolism, hyperlipidemia, and insulin resistance.
• Liver damage, hepatomegaly, and hepatic endoplasmic reticulum (ER) stress are common consequences of severe burns.
• The molecular mechanisms underlying these burn-induced metabolic and hepatic changes are not fully understood.

Purpose of the Study:

• To investigate the effects of fenofibrate on burn-induced hepatic morphologic and metabolic alterations in a rat model.
• To determine if fenofibrate can mitigate liver injury, ER stress, and lipid metabolism changes following thermal injury.

Main Methods:

• Rats were randomized into sham, burn injury, and burn injury plus fenofibrate groups.
• Fenofibrate, a peroxisome proliferator-activated receptor alpha (PPARα) agonist, was administered to assess its impact on liver health.
• Livers were analyzed at 24 and 48 hours post-burn for biochemical markers, ER stress indicators, and gene expression related to fatty acid metabolism.

Main Results:

• Burn injury led to decreased albumin and increased alanine transaminase, indicative of liver injury, which fenofibrate did not ameliorate.
• Hepatic endoplasmic reticulum (ER) stress was significantly elevated post-burn, and fenofibrate treatment did not alleviate this stress.
• Fenofibrate enhanced the expression of genes involved in fatty acid metabolism, leading to a reduction in postburn hepatic steatosis.

Conclusions:

• Fenofibrate did not protect against burn-induced hepatic ER stress or dysfunction.
• Fenofibrate effectively reduced hepatic steatosis by modulating hepatic genes involved in fat metabolism.
• The study highlights fenofibrate's specific effect on lipid metabolism in the context of burn injury, without improving overall liver stress markers.