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

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.