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  4. Involvement of advillin in somatosensory neuron subtype-specific axon regeneration and neuropathic pain

Involvement of advillin in somatosensory neuron subtype-specific axon regeneration and neuropathic pain

PNAS, 2018 · DOI: 10.1073/pnas.1716470115 · Published: August 20, 2018

Regenerative MedicineNeurologyPain Management

Simple Explanation

This study investigates the role of advillin, a protein found in sensory neurons, in axon regeneration and neuropathic pain. The researchers found that advillin is mainly expressed in a specific type of sensory neuron in adults and is important for these neurons to regrow after injury. When advillin is removed, these neurons have trouble regenerating, and the mice experience more pain. The researchers also found that advillin can be detected in the cerebrospinal fluid of mice with nerve damage, suggesting it could be a useful marker for diagnosing nerve problems. Advillin, found in sensory neurons, aids in axon regeneration and pain management. It modulates growth cone formation and is detectable in cerebrospinal fluid during neuropathy, potentially serving as a diagnostic marker.

Study Duration
Not specified
Participants
Mice
Evidence Level
Not specified

Key Findings

  • 1
    Advillin expression is restricted to isolectin B4-positive (IB4+) neurons in the adult dorsal root ganglia (DRG).
  • 2
    Advillin knockout (KO) specifically impaired axonal regeneration in adult IB4+ DRG neurons.
  • 3
    Advillin KO disturbed experimental autoimmune encephalomyelitis-induced neural plasticity in the spinal-cord dorsal horn and aggravated neuropathic pain.

Research Summary

The study reveals that advillin, a sensory neuron-specific protein, plays a critical role in axonal regeneration of IB4+ sensory neurons and facilitates recovery from peripheral neuropathy and neuropathic pain. Advillin is involved in modulating cytoskeletal reorganization during growth cone formation, interacting with FAK and myosin II/vinculin-dependent adhesion complexes to modulate actin dynamics. Advillin-associated protein complex is shed during neurite retraction and is detectable in the cerebrospinal fluid (CSF) of mice with peripheral neuropathy, suggesting it could serve as a bio-signature for diagnosis.

Practical Implications

Diagnostic Marker

Advillin in CSF could be a bio-signature for peripheral neuropathy.

Therapeutic Target

Promoting IB4+ axon regeneration may alleviate neuropathic pain.

Understanding Neuropathic Pain

Advillin is critical for harmonious recovery from neural injury.

Study Limitations

  • 1
    Possible gene redundancy of other villin/gelsolin family members contributing to the pain phenotypes in Avil−/−mice.
  • 2
    Nerve-injury conditions might vary among models and among mice.
  • 3
    Further investigation is needed to optimize the detection ranges and sensitivity of advillin in CSF.

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