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New microelectrode array tools for studying 3D brain organoids

By Kim D & Ryu H.·2026·Department of Intelligence Energy and Industry, South Korea·View original on Europe PMC

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Original publication title: Recent Advances in Microelectrode Array Interfaces for Organoids.

Brain & nerves

Plain-English summary

This research looks at how scientists are using tiny devices called microelectrode arrays (MEAs) to study brain organoids, which are small, lab-grown clusters of brain cells. These devices help record brain activity, but traditional ones only measure from the flat surface of the organoids, making it hard to understand the full three-dimensional structure of the brain cells. The review highlights new technologies that improve these devices, allowing for better measurements and longer monitoring of brain organoids. These advancements could lead to better insights into brain disorders and new treatment options. Overall, the research shows promise for improving how we study brain function using organoids.

Abstract

Electrophysiological studies using brain organoids provide valuable insights into neurological disorders and offer promising opportunities for therapeutic development. Accordingly, conventional two-dimensional microelectrode arrays (MEAs) are commonly employed to record neural activity with high spatiotemporal resolution. However, their measurements are mainly limited to the basal surface of the tissue. This limitation restricts the comprehensive analysis of the complex three-dimensional (3D) neural networks formed within organoids. To bridge this gap, this review summarizes recent advances in 3D MEA technologies, with a focus on device geometries, electrode designs, and neural signal acquisition strategies ranging from noninvasive to invasive approaches. Among these advances, photolithography-based fabrication processes have enabled submicron-scale structures, improving device flexibility, spatial resolution, and signal-to-noise ratio. Furthermore, the integration of 3D MEAs with perfusion systems and shape-transformable architectures facilitates stable, long-term electrophysiological monitoring of organoids. Finally, this review discusses emerging research trends and future perspectives in 3D MEA development in organoid-based neuroscience.

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Original publication on Europe PMC: https://europepmc.org/article/MED/41744588