TY  - JOUR
PY  - 2021//
TI  - (18)F-FDG PET combined with MR spectroscopy elucidates the progressive metabolic cerebral alterations after blast-induced mild traumatic brain injury in rats
JO  - Frontiers in neuroscience
A1  - Li, Yang
A1  - Liu, Kaijun
A1  - Li, Chang
A1  - Guo, Yu
A1  - Fang, Jingqin
A1  - Tong, Haipeng
A1  - Tang, Yi
A1  - Zhang, Junfeng
A1  - Sun, Jinju
A1  - Jiao, Fangyang
A1  - Zhang, Qianhui
A1  - Jin, Rongbing
A1  - Xiong, Kunlin
A1  - Chen, Xiao
SP  - e593723
EP  - e593723
VL  - 15
IS  - 
N2  - A majority of blast-induced mild traumatic brain injury (mTBI) patients experience persistent neurological dysfunction with no findings on conventional structural MR imaging. It is urgent to develop advanced imaging modalities to detect and understand the pathophysiology of blast-induced mTBI. Fluorine-18 fluorodeoxyglucose positron emission tomography ((18)F-FDG PET) could detect neuronal function and activity of the injured brain, while MR spectroscopy provides complementary information and assesses metabolic irregularities following injury. This study aims to investigate the effectiveness of combining (18)F-FDG PET with MR spectroscopy to evaluate acute and subacute metabolic cerebral alterations caused by blast-induced mTBI. Thirty-two adult male Sprague-Dawley rats were exposed to a single blast (mTBI group) and 32 rats were not exposed to the blast (sham group), followed by (18)F-FDG PET, MRI, and histological evaluation at baseline, 1-3 h, 1 day, and 7 days post-injury in three separate cohorts. (18)F-FDG uptake showed a transient increase in the amygdala and somatosensory cortex, followed by a gradual return to baseline from day 1 to 7 days post-injury and a continuous rise in the motor cortex. In contrast, decreased (18)F-FDG uptake was seen in the midbrain structures (inferior and superior colliculus). Analysis of MR spectroscopy showed that inflammation marker myo-inositol (Ins), oxidative stress marker glutamine + glutamate (Glx), and hypoxia marker lactate (Lac) levels markedly elevated over time in the somatosensory cortex, while the major osmolyte taurine (Tau) level immediately increased at 1-3 h and 1 day, and then returned to sham level on 7 days post-injury, which could be due to the disruption of the blood-brain barrier. Increased (18)F-FDG uptake and elevated Ins and Glx levels over time were confirmed by histology analysis which showed increased microglial activation and gliosis in the frontal cortex. These results suggest that (18)F-FDG PET and MR spectroscopy can be used together to reflect more comprehensive neuropathological alterations in vivo, which could improve our understanding of the complex alterations in the brain after blast-induced mTBI.<p />  <p>Language: en</p>
LA  - en
SN  - 1662-4548
UR  - http://dx.doi.org/10.3389/fnins.2021.593723
ID  - ref1
ER  -