التفاصيل البيبلوغرافية
| العنوان: |
The neural response to deep brain stimulation of the anterior nucleus of the thalamus: A MEMRI and c-Fos study. |
| المؤلفون: |
Gimenes, Christiane1 (AUTHOR), Malheiros, Jackeline Moraes1 (AUTHOR), Battapady, Harsha2 (AUTHOR), Tannus, Alberto3 (AUTHOR), Hamani, Clement4 (AUTHOR), Covolan, Luciene1,5 (AUTHOR) lucovolan@gmail.com |
| المصدر: |
Brain Research Bulletin. Apr2019, Vol. 147, p133-139. 7p. |
| مصطلحات موضوعية: |
*THALAMIC nuclei, *DEEP brain stimulation |
| مصطلحات جغرافية: |
UNITED States |
| مستخلص: |
Highlights • In rat, we tested how 1 h of ANT DBS affects the cell activity in the circuit of Papez. • Reduction of cell excitability is demonstrated after high frequency ANT DBS using in vivo MRI. • The results rely on the reduced uptake of manganese, a Ca2+ competitor, by active cells. • The reduced cell activity in the whole circuit of Papez may underlies the ANT DBS mechanism to reduce spontaneous seizures. Abstract Background Deep brain stimulation (DBS) refers to the delivery of electric current to specific deep brain structures through implanted electrodes. Recently approved for use in United States, DBS to the anterior nucleus of thalamus (ANT) is a safe and effective alternative treatment for medically refractory seizures. Despite the anti-seizure effects of ANT DBS, preclinical and clinical studies have failed to demonstrate it actions at a whole brain level. Objective Here, we used a magnetic resonance imaging (MRI)-based approach in healthy adult rats to investigate the effects of ANT DBS through the circuit of Papez, which has central role in the generation and propagation of limbic seizures, in temporal lobe epilepsy (TLE). Methods After ANT electrode implantation and recovery, ANT DBS and SHAM (sham animals had electrodes implanted but were not stimulated) rats received one single injection of the contrast enhancer, manganese chloride (60 mg/kg, ip). Twelve hours after, rats underwent the baseline scan using the MEMRI (Manganese-Enhanced Magnetic Resonance Imaging) technique. We used the same MEMRI and parvalbumin sequence to follow the DBS delivered during 1 h (130 Hz and 200 μA). Perfusion was followed by subsequent c-Fos and parvalbumin immunostaining of brain sections. Results Acute unilateral ANT DBS significantly reduced the overall manganese uptake and consequently, the MEMRI contrast in the circuit of Papez. Additionally, c-Fos expression was bilaterally increased in the cingulate cortex and posterior hypothalamus, areas directly connected to ANT, as well as in amygdala and subiculum, within the limbic circuitry. Conclusion Our data indicate that MEMRI can be used to detect whole-brain responses to DBS, as the high frequency stimulation parameters used here caused a significant reduction of cell activity in the circuit of Papez that might help to explain the antiepileptic effects of ANT DBS. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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