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Related Experiment Video

Updated: Sep 28, 2025

Adult Mouse Digit Amputation and Regeneration: A Simple Model to Investigate Mammalian Blastema Formation and Intramembranous Ossification
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Digit specific denervation does not inhibit mouse digit tip regeneration.

Connor P Dolan1, Felisha Imholt2, Mingquan Yan2

  • 1Department of Veterinary Physiology and Pharmacology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX, 77843, USA; DoD-VA Extremity Trauma and Amputation Center of Excellence, Bethesda, MD, 20814, USA; Department of Surgery, Uniformed Services University of the Health Sciences and Walter Reed National Military Medical Center, Bethesda, MD, 20814, USA.

Developmental Biology
|March 30, 2022
PubMed
Summary

Mammalian digit tip regeneration is not dependent on peripheral nerves. Specific denervation only slightly reduces regeneration, and improved wound healing partially restores the response, challenging current regenerative medicine approaches.

Keywords:
BlastemaDenervationDigitEpimorphic regenerationde novo bone formation

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Area of Science:

  • Regenerative Medicine
  • Developmental Biology
  • Neuroscience

Background:

  • Epimorphic regeneration of appendages in amphibians and fish depends on neurotrophic factors.
  • Mammalian digit tip regeneration is considered a model for epimorphic regeneration, with limb denervation inhibiting the response.
  • Previous studies faced confounding factors like paralysis and reduced mechanical loading, obscuring the role of denervation.

Purpose of the Study:

  • To investigate the role of peripheral nerve signaling versus mechanical loading in mammalian digit tip regeneration.
  • To develop a surgical method for digit-specific denervation without affecting limb function.
  • To clarify the dependency of mammalian epimorphic regeneration on nerve-derived signals.

Main Methods:

  • Developed a novel surgical technique for precise digit denervation in mice, preserving ambulation and mechanical loading.
  • Assessed the impact of denervation on digit tip regeneration.
  • Utilized wound dressings to enhance closure in denervated digits to test the role of wound healing.

Main Results:

  • Specific digit denervation attenuated but did not inhibit digit tip regeneration.
  • Delayed wound healing was identified as a contributing factor to the attenuated regeneration.
  • Enhanced wound closure partially rescued the regenerative capacity of denervated digits.

Conclusions:

  • Mammalian digit tip regeneration is not strictly dependent on peripheral nerve innervation.
  • Wound healing plays a significant role in the regenerative process, potentially more than previously understood.
  • These findings necessitate a re-evaluation of current mammalian regenerative medicine strategies focusing on nerve dependency.