کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2176500 | 1094541 | 2015 | 13 صفحه PDF | دانلود رایگان |
• Melanocyte regeneration is mediated by unpigmented mitfa-expressing progenitor cells
• Most new melanocytes arise through direct differentiation of progenitors
• Direct differentiation of progenitors requires Wnt signaling
• Symmetric divisions maintain the progenitor pool
SummaryEfficient regeneration following injury is critical for maintaining tissue function and enabling organismal survival. Cells reconstituting damaged tissue are often generated from resident stem or progenitor cells or from cells that have dedifferentiated and become proliferative. While lineage-tracing studies have defined cellular sources of regeneration in many tissues, the process by which these cells execute the regenerative process is largely obscure. Here, we have identified tissue-resident progenitor cells that mediate regeneration of zebrafish stripe melanocytes and defined how these cells reconstitute pigmentation. Nearly all regeneration melanocytes arise through direct differentiation of progenitor cells. Wnt signaling is activated prior to differentiation, and inhibition of Wnt signaling impairs regeneration. Additional progenitors divide symmetrically to sustain the pool of progenitor cells. Combining direct differentiation with symmetric progenitor divisions may serve as a means to rapidly repair injured tissue while preserving the capacity to regenerate.
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Journal: - Volume 33, Issue 6, 22 June 2015, Pages 631–643