PuSH - Publikationsserver des Helmholtz Zentrums München: Osteoclast-mediated resorption primes the skeleton for successful integration during axolotl limb regeneration.

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Riquelme-Guzmán, C.* ; Tsai, S.L.* ; Carreon Paz, K.* ; Nguyen, C.* ; Oriola, D.* ; Schuez, M.* ; Brugués, J.* ; Currie, J.D.* ; Sandoval-Guzmán, T.

Osteoclast-mediated resorption primes the skeleton for successful integration during axolotl limb regeneration.

eLife 11:e79966 (2022)

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Early events during axolotl limb regeneration include an immune response and the formation of a wound epithelium. These events are linked to a clearance of damaged tissue prior to blastema formation and regeneration of the missing structures. Here, we report the resorption of calcified skeletal tissue as an active, cell-driven, and highly regulated event. This process, carried out by osteoclasts, is essential for a successful integration of the newly formed skeleton. Indeed, the extent of resorption is directly correlated with the integration efficiency, and treatment with zoledronic acid resulted in osteoclast function inhibition and failed tissue integration. Moreover, we identified the wound epithelium as a regulator of skeletal resorption, likely releasing signals involved in recruitment/differentiation of osteoclasts. Finally, we reported a correlation between resorption and blastema formation, particularly, a coordination of resorption with cartilage condensation. In sum, our results identify resorption as a major event upon amputation, playing a critical role in the overall process of skeletal regeneration.

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