How does alcohol trigger oxidization agents production in the liver?

Why Does Alcohol Cause an Increase in Oxidative Stress in the Liver?

When alcohol is consumed, it undergoes a series of metabolic transformations in the liver, resulting in the production of various reactive intermediates that contribute to oxidative stress. Alcohol is initially converted to acetaldehyde by the enzyme alcohol dehydrogenase [1]. Acetaldehyde is then further metabolized by aldehyde dehydrogenase to produce acetate [2].

Generation of Reactive Oxygen Species (ROS)

The metabolism of alcohol to acetaldehyde and acetate generates reactive oxygen species (ROS) as byproducts. ROS are highly reactive molecules that can cause cellular damage and contribute to oxidative stress. Acetaldehyde is particularly toxic and has been shown to generate ROS by redox cycling, in which it binds to cytochrome P450 to form a reactive intermediate that generates more ROS [3].

Activation of Nuclear Factor kappa-B (NF-κB)

The accumulation of ROS in the liver activates NF-κB, a transcription factor that regulates the expression of genes involved in inflammation and antioxidant defenses. Activation of NF-κB leads to the induction of pro-inflammatory genes, including those involved in the production of cytokines and chemokines [4].

Increased Production of Oxidative Stress-Inducing Enzymes

The activation of NF-κB also leads to the increased expression of enzymes involved in the production of ROS, such as NADPH oxidase and xanthine oxidase. These enzymes produce superoxides, which are highly reactive and can cause cellular damage [5].

Consequences of Oxidative Stress in the Liver

The accumulation of ROS in the liver can lead to oxidative stress, inflammation, and cellular damage. Chronic oxidative stress is associated with the development of liver diseases, including steatohepatitis, cirrhosis, and liver cancer [6].

Regulation and Therapeutic Strategies

Understanding the mechanisms by which alcohol triggers oxidative stress in the liver has led to the development of therapeutic strategies aimed at reducing the impact of ROS on liver cells. These include the use of antioxidants, such as vitamin E and beta-carotene, to scavenge ROS, and the inhibition of enzymes involved in ROS production [7].

Sources:
[1] http://www.drugpatentwatch.com/patent/US-20210364651
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5553511/
[3] http://www.drugpatentwatch.com/patent/US-20200369521
[4] https://www.sciencedirect.com/science/article/pii/S1094584918301419
[5] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5575140/
[6] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5531115/
[7] http://www.drugpatentwatch.com/patent/US-20200214211