Metabolic assessment of a migraine model using relaxation-enhanced 1 H spectroscopy at ultrahigh field.

ABSTRACT: PURPOSE:This study evaluates biochemical imbalances in a rat model that reflects dysfunctional pathways in migraine. The high sensitivity and spectral dispersion available to 1 H MRS at 21.1?T expands metabolic profiling in this migraine model to include lactate (Lac), taurine (Tau), aspartate, and Gly-a mixture of glycine, glutamine, and glutamate. METHODS:Sprague-Dawley male rats were administered in situ an intraperitoneal injection of nitroglycerin (NTG) to induce the migraine analogue or saline as a control. A selective relaxation-enhanced MR spectroscopy sequence was used to target upfield metabolites from a 4-mm3 voxel for 2.5?h after injection. RESULTS:Significant increases were evident for Lac as early as 10?min after NTG injection, peaking over 50% compared with baseline and control (normalized Lac/N-acetyl aspartate with NTG?=?1.54?±?0.65 versus with saline?=?0.99?±?0.08). Tau decreased progressively in controls over 2?h after injection, but remained elevated with NTG, peaking at 105?min after injection (normalized Tau/N-acetyl aspartate with NTG?=?1.10?±?0.18 versus with saline?=?0.85?±?0.14). Total creatine under NTG showed significant decreases with time and compared with saline; Gly demonstrated temporal increases for NTG. CONCLUSIONS:These changes indicate an altered metabolic profile in the migraine analogue consistent with early changes in neural activity and/or vasodilation consistent with progressively enhanced neuroprotection and osmoregulation. Magn Reson Med 79:1266-1275, 2018. © 2017 International Society for Magnetic Resonance in Medicine.

SUBMITTER: Abad N 

PROVIDER: S-EPMC5775911 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature