Peroxisome induction studies on di(2-ethylhexyl)terephthalate

Area of Science:

• Toxicology
• Metabolism
• Hepatology

Background:

• Di(2-ethylhexyl)phthalate (DEHP) is known to induce peroxisome proliferation.
• Understanding the toxicological profile of alternative plasticizers like di(2-ethylhexyl)terephthalate (DEHT) is crucial.

Purpose of the Study:

• To compare the effects of DEHT and DEHP on rat liver and lipid metabolism.
• To investigate the dose-dependent toxicity and metabolic fate of DEHT.

Main Methods:

• Rats were fed diets containing 0% to 2.5% DEHT or 1.2% DEHP for 21 days.
• Evaluated feed consumption, body weight gain, serum lipids, enzyme activities, and hepatic peroxisome proliferation.
• Analyzed DEHT metabolism in rats.

Main Results:

• DEHT caused decreased feed consumption and weight gain only at 2.5%, with minimal impact on liver weight and peroxisomes.
• DEHP at 1.2% significantly increased liver weight, lipid metabolism enzymes, and peroxisome content.
• DEHT metabolism yields 2-ethylhexanol and terephthalic acid, with 2-ethylhexanol being less potent in peroxisome induction than DEHP metabolites.

Conclusions:

• DEHT exhibits a lower potential for peroxisome proliferation and liver effects compared to DEHP.
• Metabolic differences, particularly the lower production of active metabolites from DEHT, explain the observed toxicological disparities.