Metabolic mechanisms of a drug revealed by distortion-free 13C tracer analysis. Issue 13 (2nd March 2021)

• Record Type: Journal Article
• Authors: Cha, Jin Wook; Jin, Xing; Jo, Sihyang; An, Yong Jin; Park, Sunghyouk
• Is Part Of: Chemical science. Volume 12:Issue 13(2021)
• Page Start: 4958
• Page End: 4962
• Publication Date: 2021-03-02
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d0sc06480g
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : Our approach provides high-resolution and distortion-free NMR for metabolic tracer analysis. It confirmed the conventional mechanism of dichloroacetate and suggested a new one involving an enhanced contribution of PPP to cytosolic serine synthesis. Abstract : Metabolomic isotopic tracing can provide flux information useful for understanding drug mechanisms. For that, NMR has the unique advantage of giving positional isotope enrichment information, but the current 13 C 1D NMR approach suffers from low sensitivity and high overlaps. We developed a new 2D heteronuclear NMR experiment incorporating J -scaling and distortion-free elements that allows for quantitative analysis of multiplets with high sensitivity and resolution. When applied to an old chemotherapeutic drug, the approach provided a quantitative estimation of TCA-cycle turns, confirming the conventional mechanism of its mitochondrial metabolic enhancement. Additionally, the approach identified a new mechanism of the higher contribution of the pentose phosphate pathway to serine synthesis in the cytosolic compartment, possibly explaining the broad pharmacological activities of the drug. Our approach may prove beneficial in helping to find new usages or metabolic mechanisms of other drugs.