Metabolite Identification of a Novel Anti-Leishmanial Agent OJT007 in Rat Liver Microsomes Using LC-MS/MS

Maria Eugenia Rincon Nigro, Ting Du, Song Gao, Manvir Kaur, Huan Xie, Omonike Arike Olaleye, Dong Liang

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The purpose of this study was to identify potential metabolic pathways and metabolites of OJT007, a methionine aminopeptidase 1 (MetAP1) inhibitor. OJT007 is a novel drug with potent antiproliferative effects against Leishmania Major. We conducted in vitro Phase I oxidation and Phase II glucuronidation assays on OJT007 using rat liver microsomes. Four unknown metabolites were initially identified using a UPLC-UV system from microsomal incubated samples. LC-MS/MS analysis was then used to identify the structural characteristics of these metabolites via precursor ion scan, neutral loss scan, and product ion scan. A glucuronide metabolite was further confirmed by β-glucuronidase hydrolysis. The kinetic parameters of OJT007 glucuronidation demonstrated that OJT007 undergoes rapid metabolism. These results demonstrate the liver’s microsomal ability to mediate three mono-oxidated metabolites and one mono-glucuronide metabolite. This suggests hepatic glucuronidation metabolism of OJT007 may be the cause of its poor oral bioavailability.

Original languageEnglish (US)
Article number2854
Issue number9
StatePublished - Apr 30 2022


  • CYP450
  • LC-MS/MS
  • UGT
  • liver microsomes
  • metabolic stability
  • Glucuronidase/metabolism
  • Rats
  • Microsomes/metabolism
  • Tandem Mass Spectrometry
  • Animals
  • Microsomes, Liver/metabolism
  • Chromatography, Liquid
  • Glucuronides/pharmacology

ASJC Scopus subject areas

  • Drug Discovery
  • Analytical Chemistry
  • Chemistry (miscellaneous)
  • Molecular Medicine
  • Physical and Theoretical Chemistry
  • Pharmaceutical Science
  • Organic Chemistry


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