用于三维神经元培养活动记录的应力驱动部分柔性微电极阵列

IF 5.4 2区 工程技术 Q1 BIOCHEMICAL RESEARCH METHODS
Lab on a Chip Pub Date : 2025-09-17 DOI:10.1039/d4lc01077a
João Serra, José C Mateus, Susana Cardoso, João Ventura, Paulo Aguiar, Diana C Leitao
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引用次数: 0

摘要

微电极阵列(MEAs)是监测发电细胞群的工具,如神经元培养,允许高精度测量电活动。尽管三维神经元培养比二维模型更能复制体内系统的行为,但传统的平面mea并不适合捕捉此类网络中的活动。新颖的MEA几何结构可以克服这一困难,但通常以增加制造复杂性为代价。在这里,我们利用薄膜层之间的应力不匹配来制造具有垂直电极的MEAs,使用与已建立的微加工协议兼容的方法。微米级SiO2铰链可以控制柔性聚酰亚胺结构的弯曲角度,并嵌入电极。通过阻抗测量、电压噪声映射和神经元活动记录,在应力驱动前后评估图案电极的性能。电极为30 × 30 μm2的三维MEAs电极阻抗为0.96±0.07 MΩ,可检测到高达400 μV的神经元活动峰。这些结果证明了所开发方法的潜力,提供了一种可扩展的方法来制造3D mea,增强了体外神经元培养的记录能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stress-actuated Partially Flexible Microelectrode Arrays for Activity Recording in 3D Neuronal Cultures
Microelectrode arrays (MEAs) are instrumental in monitoring electrogenic cell populations, such as neuronal cultures, allowing high precision measurements of electrical activity. Although three-dimensional neuronal cultures replicate the behavior of in vivo systems better than two-dimensional models, conventional planar MEAs are not well suited to capture activity within such networks. Novel MEA geometries can overcome this difficulty, but often at the cost of increased fabrication complexity. Here, we used the stress mismatch between thin film layers to fabricate MEAs with vertical electrodes, using methods compatible with established microfabrication protocols. A micrometric SiO2 hinge enables control over the bending angle of flexible polyimide structures with embedded electrodes. The performance of the patterned electrodes was assessed before and after stress actuation, through impedance measurements, voltage noise mapping, and neuronal activity recordings. 3D MEAs with 30 × 30 μm2 electrodes showed an impedance of 0.96 ± 0.07 MΩ per electrode and detected neuronal activity spikes with amplitudes as high as 400 μV. These results demonstrate the potential of the developed methods to provide a scalable approach to fabricate 3D MEAs, enabling enhanced recording capabilities for in vitro neuronal cultures.
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来源期刊
Lab on a Chip
Lab on a Chip 工程技术-化学综合
CiteScore
11.10
自引率
8.20%
发文量
434
审稿时长
2.6 months
期刊介绍: Lab on a Chip is the premiere journal that publishes cutting-edge research in the field of miniaturization. By their very nature, microfluidic/nanofluidic/miniaturized systems are at the intersection of disciplines, spanning fundamental research to high-end application, which is reflected by the broad readership of the journal. Lab on a Chip publishes two types of papers on original research: full-length research papers and communications. Papers should demonstrate innovations, which can come from technical advancements or applications addressing pressing needs in globally important areas. The journal also publishes Comments, Reviews, and Perspectives.
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