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Safety of Special Waveform of Transcranial Electrical Stimulation (TES): In Vivo Assessment.

Authors :
Adeel M
Chen CC
Lin BS
Chen HC
Liou JC
Li YT
Peng CW
Source :
International journal of molecular sciences [Int J Mol Sci] 2022 Jun 20; Vol. 23 (12). Date of Electronic Publication: 2022 Jun 20.
Publication Year :
2022

Abstract

Intermittent theta burst (iTBS) powered by direct current stimulation (DCS) can safely be applied transcranially to induce neuroplasticity in the human and animal brain cortex. tDCS-iTBS is a special waveform that is used by very few studies, and its safety needs to be confirmed. Therefore, we aimed to evaluate the safety of tDCS-iTBS in an animal model after brain stimulations for 1 h and 4 weeks. Thirty-one Sprague Dawley rats were divided into two groups: (1) short-term stimulation for 1 h/session (sham, low, and high) and (2) long-term for 30 min, 3 sessions/week for 4 weeks (sham and high). The anodal stimulation applied over the primary motor cortex ranged from 2.5 to 4.5 mA/cm <superscript>2</superscript> . The brain biomarkers and scalp tissues were assessed using ELISA and histological analysis (H&E staining) after stimulations. The caspase-3 activity, cortical myelin basic protein (MBP) expression, and cortical interleukin (IL-6) levels increased slightly in both groups compared to sham. The serum MBP, cortical neuron-specific enolase (NSE), and serum IL-6 slightly changed from sham after stimulations. There was no obvious edema or cell necrosis seen in cortical histology after the intervention. The short- and long-term stimulations did not induce significant adverse effects on brain and scalp tissues upon assessing biomarkers and conducting histological analysis.

Details

Language :
English
ISSN :
1422-0067
Volume :
23
Issue :
12
Database :
MEDLINE
Journal :
International journal of molecular sciences
Publication Type :
Academic Journal
Accession number :
35743291
Full Text :
https://doi.org/10.3390/ijms23126850