Characterization of sustained BOLD activation in the rat barrel cortex and neurochemical consequences.

Détails

ID Serval
serval:BIB_A3CDB17BE3B3
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Characterization of sustained BOLD activation in the rat barrel cortex and neurochemical consequences.
Périodique
Neuroimage
Auteur⸱e⸱s
Just N., Xin L., Frenkel H., Gruetter R.
ISSN
1095-9572 (Electronic)
ISSN-L
1053-8119
Statut éditorial
Publié
Date de publication
2013
Volume
74
Pages
343-351
Langue
anglais
Notes
Publication types: Journal ArticlePublication Status: ppublish
Résumé
To date, only a couple of functional MR spectroscopy (fMRS) studies were conducted in rats. Due to the low temporal resolution of (1)H MRS techniques, prolonged stimulation paradigms are necessary for investigating the metabolic outcome in the rat brain during functional challenge. However, sustained activation of cortical areas is usually difficult to obtain due to neural adaptation. Anesthesia, habituation, high variability of the basal state metabolite concentrations as well as low concentrations of the metabolites of interest such as lactate (Lac), glucose (Glc) or γ-aminobutyric acid (GABA) and small expected changes of metabolite concentrations need to be addressed. In the present study, the rat barrel cortex was reliably and reproducibly activated through sustained trigeminal nerve (TGN) stimulation. In addition, TGN stimulation induced significant positive changes in lactate (+1.01μmol/g, p<0.008) and glutamate (+0.92μmol/g, p<0.02) and significant negative aspartate changes (-0.63μmol/g, p<0.004) using functional (1)H MRS at 9.4T in agreement with previous changes observed in human fMRS studies. Finally, for the first time, the dynamics of lactate, glucose, aspartate and glutamate concentrations during sustained somatosensory activation in rats using fMRS were assessed. These results allow demonstrating the feasibility of fMRS measurements during prolonged barrel cortex activation in rats.
Pubmed
Web of science
Création de la notice
29/04/2013 10:41
Dernière modification de la notice
20/08/2019 16:09
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