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Engineered Axonal Tracts as "Living Electrodes" for Synaptic-Based Modulation of Neural Circuitry.

Mijail D Serruya1, James P Harris2, Dayo O Adewole3

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Researchers developed a novel biohybrid brain-computer interface using living neurons as "living electrodes." This approach aims to overcome inflammation and improve long-term performance for neural modulation.

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biologically-mediated neuromodulationbrain–computer interfacesliving scaffoldsmicrotissue engineeringtissue engineering

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Area of Science:

  • Neuroscience
  • Biomaterials Engineering
  • Bioelectronics

Background:

  • Conventional brain-computer interfaces (BCIs) using non-organic electrodes face performance degradation due to inflammatory foreign body responses.
  • Existing neural implants often trigger chronic inflammation, limiting their long-term efficacy and biocompatibility.

Purpose of the Study:

  • To introduce a novel biohybrid strategy for neural interfacing using living neurons as biological components.
  • To overcome the limitations of traditional implants by creating a biocompatible neural interface with reduced foreign body response.
  • To explore the potential of axon-based living electrodes for precise neural probing and modulation.

Main Methods:

  • Development of axon-based living electrodes using microtissue engineering techniques, creating columnar neuronal microstructures within a hydrogel.
  • Microinjection of living electrodes into the brain, allowing axonal segments to integrate synaptically with host neurons.
  • Externalization of the neuronal cell body segment for connection with surface-based electrical-optical arrays for computer control.

Main Results:

  • The biohybrid interface successfully integrates living neuronal components with microelectronic/optical technology.
  • Only the biological component remains within the brain tissue, potentially mitigating chronic foreign-body responses.
  • Demonstrated potential for targeted, synaptic-based neuromodulation with computer control via external arrays.

Conclusions:

  • The biohybrid approach offers a promising alternative to conventional neural interfaces, potentially enhancing biocompatibility and long-term function.
  • Axon-based living electrodes provide a unique platform for specific neural circuit modulation through synaptic integration.
  • Further research is needed to fully assess the specificity, density, and long-term fidelity compared to existing technologies.