Bio-electrochemical microelectrode arrays for glutamate and electrophysiology detection in hippocampus of temporal lobe epileptic rats
| Autor: | Jie Liu, Yilin Song, Yang Xia, Shengwei Xu, Ziyue Li, Fei Gao, Xinxia Cai, Fengru Guo, Yu Zhang, Guihua Xiao, Mixia Wang |
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| Rok vydání: | 2018 |
| Předmět: |
Male
0301 basic medicine Biophysics Action Potentials Glutamic Acid Metal Nanoparticles Hippocampus Local field potential Biochemistry Temporal lobe Rats Sprague-Dawley 03 medical and health sciences Epilepsy 0302 clinical medicine medicine Animals Molecular Biology Platinum Chemistry Glutamate receptor Cell Biology Glutamic acid medicine.disease Rats Electrophysiology Microelectrode 030104 developmental biology Epilepsy Temporal Lobe Gold Microelectrodes 030217 neurology & neurosurgery |
| Zdroj: | Analytical Biochemistry. 550:123-131 |
| ISSN: | 0003-2697 |
| Popis: | Temporal Lobe Epilepsy (TLE) is a chronic neurological disorder, characterized by sudden, repeated and transient central nervous system dysfunction. For better understanding of TLE, bio-nanomodified microelectrode arrays (MEA) are designed, for the achievement of high-quality simultaneous detection of glutamate signals (Glu) and multi-channel electrophysiological signals including action potentials (spikes) and local field potentials (LFPs). The MEA was fabricated by Micro-Electro-Mechanical System fabrication technology and all recording sites were modified with platinum black nano-particles, the average impedance decreased by nearly 90 times. Additionally, glutamate oxidase was also modified for the detection of Glu. The average sensitivity of the electrode in Glu solution was 1.999 ± 0.032 × 10-2pA/μM·μm2(n = 3) and linearity was R = 0.9986, with a good selectivity of 97.82% for glutamate and effective blocking of other interferents. In the in-vivo experiments, the MEA was subjected in hippocampus to electrophysiology and Glu concentration detection. During seizures, the fire rate of spikes increases, and the interspike interval is concentrated within 30 ms. The amplitude of LFPs increases by 3 times and the power increases. The Glu level (4.22 μM, n = 4) was obviously higher than normal rats (2.24 μM, n = 4). The MEA probe provides an advanced tool for the detection of dual-mode signals in the research of neurological diseases. |
| Databáze: | OpenAIRE |
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