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Quantitation with QUEST of brain HRMAS‐NMR signals: Application to metabolic disorders in experimental epileptic seizures
Author(s) -
Rabeson H.,
Fauvelle F.,
Testylier G.,
Foquin A.,
Carpentier P.,
Dorandeu F.,
van Ormondt D.,
GraveronDemilly D.
Publication year - 2008
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.21610
Subject(s) - chemistry , metabolite , glutamine , status epilepticus , piriform cortex , in vivo , ex vivo , choline , soman , nuclear magnetic resonance , amino acid , biochemistry , neuroscience , epilepsy , central nervous system , in vitro , biology , physics , microbiology and biotechnology , acetylcholinesterase , enzyme
Quantitation of High Resolution Magic Angle Spinning (HRMAS) Nuclear Magnetic Resonance (NMR) signals enables establishing reference metabolite profiles of ex vivo tissues. Signals are often contaminated by a background signal originating mainly from macromolecules and lipids and by residual water which hampers proper quantitation. We show that automatic quantitation of HRMAS signals, even in the presence of a background, can be achieved by the semi‐parametric algorithm QUEST based on prior knowledge of a metabolite basis‐set. The latter was quantum‐mechanically simulated with NMR‐SCOPE and requires accurate spin parameters. The region of interest of spectra is a small part of the full spectral bandwidth. Reducing the computation time inherent to the large number of data‐points is possible by using ER‐Filter in a preprocessing step. Through Monte‐Carlo studies, we analyze the performances of quantitation without and with ER‐Filtering. Applications of QUEST to quantitation of 1 H ex vivo HRMAS‐NMR data of mouse brains after intoxication with soman, are demonstrated. Metabolic profiles obtained during status epilepticus and later when neuronal lesions are installed, are established. Acetate, Alanine, Choline and γ‐amino‐butyric acid concentrations increase in the piriform cortex during the initial status epilepticus, when seizures are maximum; Lactate and Glutamine concentrations increase while myo‐Inositol and N‐acetylaspartate concentrations decrease when neuronal lesions are clearly installed. Magn Reson Med 59:1266–1273, 2008. © 2008 Wiley‐Liss, Inc.