Identification of Plasma Metabolites Responding to Oxycodone Exposure in Rats

Area of Science:

• Pharmacology and Toxicology
• Metabolomics
• Neuroscience

Background:

• Oxycodone possesses a higher abuse potential compared to other prescription opioids.
• Limited metabolomics research has specifically investigated oxycodone's effects.

Purpose of the Study:

• To investigate metabolomics alterations linked to oxycodone exposure.
• To gain insights into the biochemical mechanisms of addiction and predict prognosis.

Main Methods:

• Plasma samples from 16 rats were analyzed pre-exposure and during intoxication using the Metabolon platform.
• 941 metabolites were characterized, with imputation strategies for missing data.
• K-Nearest Neighbor imputation and binarization were used for metabolite data.

Main Results:

• Significant changes in metabolite abundance were observed, including adenine (decreased) and linoleamide (increased).
• 364 metabolites showed significant changes, with succinate, oleamide, and sarcosine identified.
• Tryptophan metabolism was among the enriched pathways; several metabolites correlated with an Addiction Index.

Conclusions:

• Oxycodone-induced metabolic pathway changes were successfully detected in blood samples.
• Blood metabolomics holds potential for advancing the understanding of addiction liability.