Simultaneous assaying of NLG919, tryptophan and kynurenine by ultrahigh performance LC-MS in pharmacokinetics and biodistribution studies.
Bioanalysis 2023;
15:315-330. [PMID:
37083471 DOI:
10.4155/bio-2023-0002]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/22/2023] Open
Abstract
Background: Indocyanine2,3-dioxygenase (IDO) is an enzyme that can catalyze the metabolism of tryptophan (Trp) into kynurenine (Kyn), thus inhibiting the tumor immune microenvironment. Method: Based on its inhibitor, NLG919(NLG), the authors developed a new immunomodulatory polymer micelle and established and verified an ultrahigh performance liquid chromatography-mass spectrometry method for the simultaneous determination of NLG, Trp and Kyn in mouse tumors through the ratio determination of Trp/Kyn tissue distribution and pharmacokinetics. The linear range of the method was 0.001-10 μg/ml. Results: Compared with NLG solution, the immunomodulatory polymeric drug-loaded micelles based on polystyrene-arginine showed higher Trp/Kyn ratio, more tumor aggregation and good pharmacokinetics. Conclusion: This method has been successfully applied to the simultaneous determination of Trp/Kyn and NLG in tumor tissues of mice.
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