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Structural Investigation of Betulinic Acid Plasma Metabolites by Tandem Mass Spectrometry

Roxana Ghiulai1,2, Marius Mioc2,3, Roxana Racoviceanu2,3

  • 1Department of Pharmacology-Pharmacotherapy, Victor Babes University of Medicine and Pharmacy Timisoara, 2nd Eftimie Murgu Sq., 300041 Timisoara, Romania.

Molecules (Basel, Switzerland)
|November 11, 2022
PubMed

Insights

Betulinic acid (BA) undergoes Phase I and Phase II metabolic transformations in mice, including hydroxylation, oxidation, sulfation, and glucuronidation. Understanding these metabolic pathways is crucial for its potential therapeutic applications in cancer treatment.

Area of Science:

  • Pharmacology
  • Metabolomics
  • Cancer Research

Background:

  • Betulinic acid (BA) shows significant antiproliferative and antitumor effects.
  • Limited information exists on the in vivo pharmacokinetic profile and metabolic transformation of BA.

Purpose of the Study:

  • To screen and structurally investigate the phase I and phase II metabolites of betulinic acid in mouse plasma.
  • To elucidate the metabolic pathways and fragmentation patterns of BA and its metabolites.

Main Methods:

  • Administration of a nanoemulsion containing BA to SKH 1 female mice.
  • Analysis of mouse plasma using Electrospray Ionization Orbitrap Mass Spectrometry (ESI Orbitrap MS) in negative ion mode.
  • Structural elucidation of metabolites via Collision-Induced Dissociation tandem Mass Spectrometry (CID MS/MS).

Main Results:

  • Identified key phase I metabolic reactions: monohydroxylation, dihydroxylation, oxidation, and hydrogenation.
  • Identified key phase II metabolic reactions: sulfation, glucuronidation, and methylation.
  • Elucidated the fragmentation pathways for BA and its detected plasma metabolites.

Conclusions:

  • Betulinic acid undergoes diverse phase I and phase II metabolic transformations in vivo.
  • The identified metabolites and their fragmentation pathways provide critical insights into BA's pharmacokinetics.
  • This study lays the groundwork for further research into BA's therapeutic potential and drug development.
Keywords:
ESI CID MS/MSbetulinic acidphase I metabolitesphase II metabolites

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