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Background/Objectives: The Glutamate Chemical Exchange Saturation Transfer (GluCEST) technique is an advanced imaging modality that enables non-invasive glutamate quantification using MRI. Methods: This study evaluated glutamate dynamics in Parkinson's disease (PD) using a unilateral PD rat model, in which Wistar rats received 6-hydroxydopamine (6-OHDA) injections into the medial forebrain bundle, selectively eliminating dopaminergic neurons in the substantia nigra-striatum pathway. Results: The PD rat model exhibited a significant GluCEST increase (MTR Values: 3.0 ppm) compared to the sham-operated group, which was suppressed by administration of L-DOPA, a dopamine precursor drug (Sham: 0.9 ± 0.4%, PD: 2.0 ± 0.2%, Sham L-DOPA: 0.9 ± 0.5%, PD_L-DOPA: 0.8 ± 0.7%, p p Conclusions: These findings suggest that GluCEST and magnetic resonance spectroscopy are valuable for assessing abnormal glutamate dynamics in the 6-OHDA-induced rat PD model. Furthermore, GluCEST may detect suppressed glutamate secretion following L-DOPA treatment, underscoring its potential for monitoring disease progression and therapeutic responses in PD.
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