The Axolotl Limb Regeneration Model as a Discovery Tool for Engineering the Stem Cell Niche

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Abstract
Purpose of Review Recent advances in genomics and gene editing have expanded the range of model organisms to include those with interesting biological capabilities such as regeneration. Among these are the classic models of regeneration biology, the salamander. Although stimulating endogenous regeneration in humans likely is many years away, with advances in stem cell biology and biomedical engineering (e.g., bio-inspired materials), it is evident that there is great potential to enhance regenerative outcomes by approaching the problem from an engineering perspective. The question at this point is what do we need to engineer? Recent Findings The value of regeneration models is that they show us how regeneration works, which then can guide efforts to mimic these developmental processes therapeutically. Among these models, the accessory limb model (ALM) was developed in the axolotl as a gain-of-function assay for the sequential steps that are required for successful regeneration. To date, this model has identified a number of proregenerative signals, including growth factor signaling associated with nerves and signals associated with the extracellular matrix (ECM) that induce pattern formation. Summary Identification of these signals through the use of models in highly regenerative vertebrates (e.g., the axolotl) offers a wide range of possible modifications for engineering bioinspired, biomimetic materials to create a dynamic stem cell niche for regeneration and scar-free repair.

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