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In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...

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Related Experiment Video

Updated: Feb 28, 2026

Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing

Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing

Published on: October 20, 2021

Immunoengineering nerve repair.

Nassir Mokarram¹, Kyle Dymanus², Akhil Srinivasan^2,3

¹Department of Biomedical Engineering, Pratt School of Engineering, Duke University, Durham, NC 27708; nassir.m@duke.edu ravi@duke.edu.

Proceedings of the National Academy of Sciences of the United States of America

|June 15, 2017

Summary

This summary is machine-generated.

This study used fractalkine to attract reparative monocytes, significantly improving peripheral nerve repair across long gaps. This immunomodulatory approach offers a new paradigm for nerve regeneration, outperforming current methods.

Keywords:

fractalkine immunomodulation macrophage monocyte nerve repair

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Last Updated: Feb 28, 2026

Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing

Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing

Published on: October 20, 2021

Transconjunctival Approach for Injection into the Rat Optic Nerve

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Published on: April 4, 2025

Traumatic Peripheral Nerve Injury in Mice

Traumatic Peripheral Nerve Injury in Mice

Published on: March 25, 2022

Area of Science:

Neuroscience
Regenerative Medicine
Immunology

Background:

Peripheral nervous system (PNS) injuries cause significant disability, including neuropathic pain and loss of motor/sensory function.
Repairing long nerve gaps (>10 mm) remains a major challenge, with autologous nerve grafts (autografts) as the current standard but having limitations.
Existing methods for bridging critical-sized nerve gaps often fall short of autograft performance, necessitating novel strategies.

Purpose of the Study:

To investigate an immunomodulatory approach using a nerve-guidance scaffold to enhance peripheral nerve regeneration.
To explore the regenerative effects of recruiting reparative monocytes to the injury site.
To determine if early immune environment modulation can create a permissive environment for nerve repair.

Main Methods:

Utilized a nerve-guidance scaffold incorporating an immunomodulatory strategy.
Administered fractalkine to modulate the immune environment at the nerve injury site.
Assessed nerve regeneration through histological and electrophysiological analyses.

Main Results:

Early fractalkine delivery dramatically increased nerve regeneration.
Histological and electrophysiological data confirmed enhanced repair.
The study demonstrated successful recruitment of reparative monocytes.

Conclusions:

Biasing the post-injury immune cellular environment towards a pro-regenerative phenotype promotes peripheral nerve repair.
This immunomodulatory approach, using fractalkine to recruit monocytes, offers a promising alternative to current nerve repair strategies.
The findings suggest a potential new paradigm for stimulating endogenous PNS repair.