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An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...

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Updated: Jul 16, 2025

Rodent Behavioral Testing to Assess Functional Deficits Caused by Microelectrode Implantation in the Rat Motor Cortex

Rodent Behavioral Testing to Assess Functional Deficits Caused by Microelectrode Implantation in the Rat Motor Cortex

Published on: August 18, 2018

Cell-specific alterations in autophagy-lysosomal activity near the chronically implanted microelectrodes.

Keying Chen¹, Camila Garcia Padilla¹, Kirill Kiselyov²

¹Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Center for Neural Basis of Cognition, Pittsburgh, PA, USA.

|September 22, 2023

Summary

Long-term microelectrode implantation causes brain tissue damage by impairing the autophagy-lysosomal pathway, leading to waste buildup. This study reveals deficits in cellular waste clearance near chronic implants.

Keywords:

Brain-computer interface Glial reactivity Neuron survival Tissue homeostasis brain metabolism

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Published on: February 11, 2013

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Last Updated: Jul 16, 2025

Rodent Behavioral Testing to Assess Functional Deficits Caused by Microelectrode Implantation in the Rat Motor Cortex

Rodent Behavioral Testing to Assess Functional Deficits Caused by Microelectrode Implantation in the Rat Motor Cortex

Published on: August 18, 2018

Tools for Surface Treatment of Silicon Planar Intracortical Microelectrodes

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Published on: June 8, 2022

Intact Histological Characterization of Brain-implanted Microdevices and Surrounding Tissue

Intact Histological Characterization of Brain-implanted Microdevices and Surrounding Tissue

Published on: February 11, 2013

Area of Science:

Neuroscience
Cell Biology
Biomedical Engineering

Background:

Intracortical microelectrodes are vital for neuroscience research and clinical use.
Long-term implantation causes neurodegeneration and impaired recording performance.
Autophagy-lysosomal pathway dysfunction is linked to neurodegenerative diseases.

Purpose of the Study:

To investigate the impact of chronic microelectrode implantation on the autophagy-lysosomal pathway.
To characterize the spatiotemporal changes in autophagy-lysosomal activity near implants.
To understand the cellular mechanisms underlying implantation-induced brain tissue degeneration.

Main Methods:

Two-photon microscopy
Immunohistology
Spatiotemporal analysis of autophagy-lysosomal markers

Main Results:

Aberrant accumulation of immature autophagy vesicles near chronic implants.
Deficits in autophagy-lysosomal clearance, cargo accumulation, and reduced lysosomal protease levels.
Reactive astrocytes exhibit myelin-containing lysosomes post-implantation.

Conclusions:

Chronic microelectrode implantation impairs the brain's intracellular waste degradation system.
Autophagy-lysosomal pathway dysfunction contributes to tissue degeneration around implants.
Understanding these mechanisms is crucial for improving long-term neural interface performance.