Bone Regenerates via Dedifferentiation of Osteoblasts in the Zebrafish Fin
While mammals have a limited capacity to repair bone defects, zebrafish can completely regenerate amputated bony structures of their fins. Fin regeneration is dependent on formation of a blastema, a progenitor cell pool accumulating at the amputation plane. It is unclear which cells the blastema is...
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Published in | Developmental cell Vol. 20; no. 5; pp. 713 - 724 |
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Main Authors | , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Cambridge, MA
Elsevier Inc
17.05.2011
Cell Press |
Subjects | |
Online Access | Get full text |
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Summary: | While mammals have a limited capacity to repair bone defects, zebrafish can completely regenerate amputated bony structures of their fins. Fin regeneration is dependent on formation of a blastema, a progenitor cell pool accumulating at the amputation plane. It is unclear which cells the blastema is derived from, whether it forms by dedifferentiation of mature cells, and whether blastema cells are multipotent. We show that mature osteoblasts dedifferentiate and form part of the blastema. Osteoblasts downregulate expression of intermediate and late bone differentiation markers and induce genes expressed by bone progenitors. Dedifferentiated osteoblasts proliferate in a FGF-dependent manner and migrate to form part of the blastema. Genetic fate mapping shows that osteoblasts only give rise to osteoblasts in the regenerate, indicating that dedifferentiation is not associated with the attainment of multipotency. Thus, bone can regenerate from mature osteoblasts via dedifferentiation, a finding with potential implications for human bone repair.
► Mature osteoblasts dedifferentiate in response to fin amputation ► Dedifferentiated osteoblasts proliferate and migrate to form part of the blastema ► Osteoblasts remain lineage restricted throughout regeneration |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1534-5807 1878-1551 |
DOI: | 10.1016/j.devcel.2011.04.014 |