title: Monitoring of the ethionamide pro-drug activation in mycobacteria by (1)H high resolution magic angle spinning NMR.
abstract: In this study, we use HRMAS NMR as a non-invasive technique to monitor the in vivo metabolism of a xenobiotic. The antituberculosis Ethionamide is a pro-drug that has to be activated in mycobacteria before inhibiting its cellular target. The use of (1)H HRMAS NMR has allowed to detect a metabolite (ETH*) of the drug directly in living bacteria, even with a spectrometer operating at the relatively low magnetic field of 300MHz. We show that metabolism monitoring of an unlabelled drug at a therapeutically relevant concentration as low as 5mug/ml is within reach of the technique. (1)H HRMAS NMR in combination with diffusion filtering leads to the conclusion that the metabolite is located inside the intact cells. The comparison of the metabolite NMR signature with that of synthetic molecules proves the non-identity of ETH* with the ETH derivatives described previously in the literature.
authors.affiliation: CNRS, Université de Lille 2 UMR 8525, Institut de Biologie de Lille, Institut Pasteur de Lille, 1 rue du Professeur Calmette, BP447, 59021 Lille Cedex, France.
authors.forename: Xavier
authors.initials: X
authors.lastname: Hanoulle
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Wieruszeski
authors.forename: Pierre
authors.initials: P
authors.lastname: Rousselot-Pailley
authors.forename: Isabelle
authors.initials: I
authors.lastname: Landrieu
authors.forename: Alain R
authors.initials: AR
authors.lastname: Baulard
authors.forename: Guy
authors.initials: G
authors.lastname: Lippens
mesh_terms: D001711:Biotransformation; D005000:Ethionamide / Q000737:chemistry* / Q000378:metabolism*; D006859:Hydrogen; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D009161:Mycobacterium / Q000378:metabolism*; D011355:Prodrugs / Q000737:chemistry* / Q000378:metabolism*; D011522:Protons; D012015:Reference Standards; D012680:Sensitivity and Specificity
chemical_list: D011355:Prodrugs; D011522:Protons; D006859:Hydrogen; D005000:Ethionamide