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Updated: Jun 13, 2025

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Amputation Triggers Long-Range Epidermal Permeability Changes in Evolutionarily Distant Regenerative Organisms.

Kelly E Dooling1, Ryan T Kim1, Elane M Kim1

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Biorxiv : the Preprint Server for Biology
|September 11, 2024
PubMed
Summary
This summary is machine-generated.

Amputation triggers widespread changes in skin permeability in regenerative animals like axolotls and planarians. This study reveals long-range effects on skin barrier function and signaling pathways following limb loss.

Keywords:
MAPK signalingepidermal barrier functionregeneration responses

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Area of Science:

  • Regenerative Biology
  • Developmental Biology
  • Physiology

Background:

  • Amputation in regenerative organisms causes body-wide responses, but long-range effects on the epidermis are poorly understood.
  • Research on amputation-induced epidermal changes has historically focused only on the wound site.

Purpose of the Study:

  • To investigate the impact of amputation on long-range epidermal permeability in axolotls and planarians.
  • To explore the role of mitogen-activated protein kinase (MAPK) signaling in amputation-induced epidermal changes.

Main Methods:

  • Comparative analysis of epidermal permeability in axolotls and planarians after amputation.
  • Assessment of MAPK signaling pathway activity in the epidermis of regenerating organisms.
  • Pharmacological inhibition of MAPK signaling in planarians to evaluate its effect on epidermal permeability.

Main Results:

  • Amputation led to a long-range increase in epidermal permeability in axolotls.
  • A concurrent long-range downregulation of MAPK signaling was observed in the axolotl epidermis.
  • In planarians, inhibiting MAPK signaling enhanced long-range epidermal permeability during regeneration.

Conclusions:

  • Amputation induces significant, long-range alterations in epidermal permeability in regenerative species.
  • MAPK signaling plays a crucial role in regulating epidermal barrier function following amputation.
  • Further research is needed to understand the pathological implications of dysregulated epidermal permeability after amputation in both regenerative and non-regenerative organisms.