Effects of ozone exposure on lipid metabolism in Huh-7 human hepatoma cells

Ozone pollution is a major environmental concern. According to recent epidemiological studies, ozone exposure increases the risk of metabolic liver disease. However, studies on the mechanisms underlying the effects of ozone exposure on hepatic oxidative damage, lipid synthesis, and catabolism are limited. In this study, Huh-7 human hepatocellular carcinoma cells were randomly divided into five groups and exposed to 200 ppb O-3 for 0, 1, 2, 4, and 8 h. We measured the levels of oxidative stress and analyzed the changes in molecules related to lipid metabolism. The levels of oxidative stress were found to be significantly elevated in Huh-7 hepatocellular carcinoma cells after O-3 exposure. Moreover, the expression levels of intracellular lipid synthases, including SREBP1, FASN, SCD1, and ACC1, were enhanced. Lipolytic enzymes, including ATGL and HSL, and the mitochondrial fatty acid oxidase, CPT1 & alpha;, were inhibited after O-3 exposure. In addition, short O-3 exposure enhanced the expression of the intracellular peroxisomal fatty acid & beta;-oxidase, ACOX1; however, its expression decreased adaptively with longer exposure times. Overall, O-3 exposure induces an increase in intracellular oxidative stress and disrupts the normal metabolism of lipids in hepatocytes, leading to intracellular lipid accumulation.

Automated summary

Ozone pollution is a significant environmental concern and exposure to ozone increases the risk of metabolic liver disease. However, there is limited research on the mechanisms underlying the effects of ozone exposure on liver oxidative damage and lipid metabolism. In this study, human hepatocellular carcinoma cells were exposed to 200 ppb ozone for various durations. The results showed elevated levels of oxidative stress and disrupted lipid metabolism in the cells, leading to intracellular lipid accumulation.