Axolotl-Derived Skin Technologies for Cranial Wounds: Translational Potentials and Alternative Biomaterials

Current surgical strategies for cranial wound repair rely on traditional models of tissue healing, fibroblast recruitment, collagen deposition, and inflammatory signaling, but incompletely leverage the mechanisms that determine whether a wound regenerates or fails. Failure in the cranial soft-tissue compartment is driven by fibrosis and impaired vascular integration, particularly following trauma, tumor resection, or radiation, where large incisions, limited vascular supply, and high mechanical tension predispose to dehiscence. This narrative review examines axolotl-inspired regenerative mechanisms and their translational potential for cranial soft-tissue repair. Unlike prior syntheses centered on amphibian limb and appendage regeneration, it focuses on axolotl skin biology as a template for cranial soft-tissue reconstruction, positions axolotl-derived and axolotl-inspired strategies within a defined biomaterials framework, and applies an explicit evidence hierarchy distinguishing mechanisms demonstrated in the axolotl from those validated in mammalian wound models and those that remain hypothetical for cranial wounds. The axolotl (Ambystoma mexicanum), a neotenic salamander that regenerates full-thickness skin without scarring, is a uniquely informative model for dissecting the inflammatory and extracellular-matrix programs that separate regeneration from fibrosis. Its skin regeneration is characterized by attenuated neutrophilic inflammation, reduced myofibroblast activation, delayed and compositionally altered provisional matrix deposition (low fibronectin, high tenascin-C), and pro-survival phosphoinositide 3-kinase/protein kinase B (PI3K-Akt) signaling. Comparative analyses indicate that controlled inflammatory amplitude and timing, effective resolution, macrophage-dependent pro-regenerative signaling, and altered matrix composition, rather than acceleration or generalized suppression of conventional inflammation-driven repair, underlie scarless outcomes. We argue that the translational value of axolotl biology lies along two complementary axes, extracellular-matrix-based scaffolds and biomimetic constructs, and molecular or biologic modulation of inflammation-matrix coupling (for example, tenascin-C delivery, TGF-β/Smad and PI3K-Akt modulation, and neutrophil- or macrophage-directed agents), rather than direct xenografting. Although translation remains preclinical, biomimetic strategies targeting inflammation-matrix interactions may improve reconstructive outcomes in complex neurosurgical wound environments.