Unveiling the Hidden Chemistry of CBD Metabolism

Characterization of the Formation of the Acyl Glucuronide Metabolite of 7-Carboxy-Cannabidiol in Human Liver, Kidney, and Intestinal Microsomes and in Vivo in Mice.

ACS medicinal chemistry letters • • Moderately Relevant
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AI Summary

This groundbreaking study delves into the metabolic process of cannabidiol (CBD), uncovering important insights about how the body breaks down and processes this popular cannabinoid. Researchers investigated the formation of a specific metabolite called 7-carboxy-cannabidiol (7-COOH-CBD), focusing on its transformation into acyl glucuronide and phenolic glucuronide in human biological systems.

The research revealed complex metabolic pathways involving specific enzymes (UGT1A1, UGT1A3, and UGT1A9) responsible for metabolizing 7-COOH-CBD. Interestingly, the study found that the metabolite can undergo significant chemical changes when interacting with different proteins, such as human serum albumin and liver fatty acid binding protein (FABP1). These interactions could potentially impact the metabolic efficiency and toxicity of CBD in the human body.

Of particular concern, the findings suggest that the 7-COOH-CBD-acyl-glucuronide metabolite may play a role in CBD-related liver toxicity. This highlights the importance of understanding the complex biochemical processes that occur when cannabinoids are metabolized, and underscores the need for further research into the potential long-term effects of CBD consumption.

📄 Original Abstract

Acyl glucuronides are common metabolites of carboxylic acids. They can be reactive and cause adverse events. The acyl glucuronide metabolite of delta-9-tetrahydrocannabinol (THC) is abundant in humans after THC consumption but acyl glucuronide formation from the cannabidiol (CBD) metabolite 7-carboxy-cannabidiol (7-COOH-CBD) has not been previously described. Here, we identified and characterized both acyl and phenolic glucuronides of 7-COOH-CBD formed in human liver, kidney, and intestinal microsomes. The 7-COOH-CBD-acyl-glucuronide was mostly formed by UGT1A1 and UGT1A3, while the 7-COOH-CBD-phenolic-glucuronide was formed by UGT1A9. 7-COOH-CBD-acyl-glucuronide formation was also detected in vivo in mice. 7-COOH-CBD-acyl-glucuronide showed extensive acyl migration while 11-COOH-THC-glucuronide did not. Human serum albumin enhanced migration, while liver fatty acid binding protein (FABP1) protected against 7-COOH-CBD-acyl-glucuronide migration. When corrected for unbound fraction, FABP1 increased 7-COOH-CBD glucuronidation efficiency. These findings suggest that 7-COOH-CBD-acyl-glucuronide is a metabolite of CBD in humans and may play a role in CBD related liver toxicity.

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