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Cranial nerves are responsible for transmitting motor and sensory information between the brain and various parts of the body. There are twelve pairs of cranial nerves. While the first six innervate the head and neck, the latter six nerves innervate the head and neck, as well as organs and tissues in the thoracic and abdominal cavities. They facilitate communication, expression, and autonomic control within the human body.
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Spinal nerves are pivotal conduits in the nervous system, bridging the central nervous system (CNS) with the peripheral nervous system (PNS). These nerves enable a complex communication network between the brain, spinal cord, and the rest of the body, facilitating sensory input, motor output, and autonomic functions.
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Engineering a 3D functional human peripheral nerve in vitro using the Nerve-on-a-Chip platform.

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Scientists developed a Human Nerve-on-a-chip (HNoaC) model using all-human cells. This preclinical tool enables nerve conduction velocity and histomorphometry measurements, improving neurodegenerative disease research.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Tissue Engineering

Background:

  • Organ-on-a-chip systems for neuroscience face challenges due to nervous system complexity and limited human cell access.
  • Animal models show low success rates in translating findings to human neurodegenerative diseases.
  • Preclinical in vitro models are needed to predict clinical trial success using human cell-based metrics.

Purpose of the Study:

  • To develop an all-human, biomimetic in vitro model of peripheral nerve tissue.
  • To enable the measurement of critical clinical metrics like nerve conduction velocity and histomorphometry.
  • To overcome limitations of current in vitro systems and animal models in neurodegenerative disease research.

Main Methods:

  • Engineered an in vitro biomimetic model using primary human neurons and Schwann cells.
  • Achieved robust neurite outgrowth and myelination within the engineered nerve tissue.
  • Integrated electrophysiological and histological assessments for comprehensive analysis.

Main Results:

  • Demonstrated robust neurite outgrowth of approximately 5 mm.
  • Achieved myelination of human neurons by human Schwann cells (~5%).
  • Successfully evaluated nerve conduction velocity, measuring between 0.13-0.28 m/sec.

Conclusions:

  • The Human Nerve-on-a-chip (HNoaC) is the first biomimetic microphysiological system of myelinated human peripheral nerve.
  • This system allows for electrophysiological and histological metric evaluation, previously only possible in vivo.
  • HNoaC offers a promising preclinical tool to improve the prediction and translation of in vitro data for neurodegenerative diseases.