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Drug Metabolism: Phase I Reactions01:17

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A phase I reaction is a biochemical process that introduces a functionally reactive polar group to a substance. This transformation predominantly occurs in the liver, facilitated by the cytochrome P450 system of hemoproteins situated in the lipophilic endoplasmic reticulum of cells. The metabolite generated through this process can have varying polarities. If it is sufficiently polar, it can be easily excreted in the urine due to its water compatibility. However, if the metabolite is nonpolar,...
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Biological factors significantly impact drug metabolism, influencing drug clearance, efficacy, and potential toxicity.
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Phase II reactions are essential for the detoxification and elimination of drugs from the body. These reactions involve the conjugation of parent drugs or their phase I metabolites with endogenous molecules, resulting in more hydrophilic drug conjugates. The primary conjugation reactions in this phase are sulfation and glucuronidation. Both sulfation and glucuronidation typically produce biologically inactive metabolites. However, in some cases involving prodrugs, active metabolites may be...
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A drug's physicochemical properties fundamentally influence its metabolism. For instance, a drug's molecular size and shape critically determine its interaction with enzymes and transporters — larger drugs may face difficulty reaching enzyme active sites, altering their metabolic pathways. The pKa of a drug, which establishes its ionization state, can impact its solubility and absorption, thereby influencing metabolism.
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Similar 5F-APINACA Metabolism between CD-1 Mouse and Human Liver Microsomes Involves Different P450 Cytochromes.

Samantha V Crosby1, Izzeldin Y Ahmed2, Laura R Osborn1

  • 1Department of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.

Metabolites
|August 25, 2022
PubMed
Summary

Synthetic cannabinoid metabolism, specifically 5F-APINACA, shows high conservation between mice and humans. However, differences in specific cytochrome P450 enzymes can lead to variations in metabolic pathways and potential health risk assessments.

Keywords:
5F-AKB485F-APINACACB1 receptorP450drug abuseenzyme kineticshumanmetabolismmousesynthetic cannabinoid

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Area of Science:

  • Pharmacology
  • Toxicology
  • Drug Metabolism

Background:

  • Synthetic cannabinoids represent a significant portion of new drugs of abuse globally.
  • Ethical constraints limit direct human studies on illicit substances, making animal models crucial.
  • Understanding species-specific metabolism is vital for interpreting animal study findings.

Purpose of the Study:

  • To conduct the first comparative analysis of steady-state metabolism for 5F-APINACA in CD-1 mice and humans.
  • To identify conserved and divergent metabolic pathways between mice and humans.
  • To elucidate the role of specific cytochrome P450 enzymes in 5F-APINACA metabolism.

Main Methods:

  • In vitro study utilizing hepatic microsomes from CD-1 mice and humans.
  • Analysis of steady-state metabolism of 5F-APINACA at varying concentrations.
  • Identification and comparison of metabolic pathways, including hydroxylation and defluorination.

Main Results:

  • 5F-APINACA metabolism involves sequential adamantyl hydroxylation and oxidative defluorination, equally efficient in both species.
  • Substrate inhibition was observed at higher concentrations, impacting adamantyl hydroxylation.
  • Human metabolism was primarily driven by CYP3A4, while mouse metabolism involved Cyp3a11 and other Cyp2c members with differing efficiencies.

Conclusions:

  • Metabolism of 5F-APINACA is highly conserved between CD-1 mice and humans.
  • Species-specific differences in cytochrome P450 enzymes can influence metabolic outcomes.
  • These findings are critical for extrapolating mouse study data to human health risk assessments.