c-Myc regulates proliferation and Fgf10 expression in airway smooth muscle after airway epithelial injury in mouse.

c-Myc regulates proliferation and Fgf10 expression in airway smooth muscle after airway epithelial injury in mouse.
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DOI:
10.1371/journal.pone.0071426
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
De Langhe S
De Langhe S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Volckaert T;Campbell A;De Langhe S

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在肺发育过程中,成纤维细胞生长因子 10 (Fgf10) 在远端间质中表达并受 Wnt 信号传导调节,作用于远端上皮祖细胞以维持它们并防止它们分化为近端(气道)上皮细胞。远端间充质中表达 Fgf10 的细胞是支气管旁平滑肌细胞 (PSMC) 的祖细胞。萘、臭氧或博来霉素诱导的气道上皮损伤后,存活的上皮细胞分泌 Wnt7b,然后激活 PSMC 生态位以诱导 Fgf10 表达。然后,微环境分泌的 Fgf10 作用于 Clara 干细胞的子集,打破静止状态,诱导增殖并启动上皮修复。在这里,我们表明,在发育过程中从肺间质中条件性删除 Wnt 靶基因 c-Myc 不会影响正确的上皮或间质分化。然而,在成人肺中,我们发现在萘介导的气道上皮损伤后,c-Myc 对于 PSMC 生态位的激活很重要,因此诱导 PSMC 中的增殖和 Fgf10 表达。我们的数据表明,从 PSMC 中条件性删除 c-Myc 会抑制气道上皮修复,而从 Clara 细胞中去除 c-Myc 对气道上皮再生没有影响。这些发现可能对于理解哮喘和慢性阻塞性肺病肺修复的失调具有重要意义。
During lung development, Fibroblast growth factor 10 (Fgf10), which is expressed in the distal mesenchyme and regulated by Wnt signaling, acts on the distal epithelial progenitors to maintain them and prevent them from differentiating into proximal (airway) epithelial cells. Fgf10-expressing cells in the distal mesenchyme are progenitors for parabronchial smooth muscle cells (PSMCs). After naphthalene, ozone or bleomycin-induced airway epithelial injury, surviving epithelial cells secrete Wnt7b which then activates the PSMC niche to induce Fgf10 expression. This Fgf10 secreted by the niche then acts on a subset of Clara stem cells to break quiescence, induce proliferation and initiate epithelial repair. Here we show that conditional deletion of the Wnt target gene c-Myc from the lung mesenchyme during development does not affect proper epithelial or mesenchymal differentiation. However, in the adult lung we show that after naphthalene-mediated airway epithelial injury c-Myc is important for the activation of the PSMC niche and as such induces proliferation and Fgf10 expression in PSMCs. Our data indicate that conditional deletion of c-Myc from PSMCs inhibits airway epithelial repair, whereas c-Myc ablation from Clara cells has no effect on airway epithelial regeneration. These findings may have important implications for understanding the misregulation of lung repair in asthma and COPD.
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