miR-142-3p balances proliferation and differentiation of mesenchymal cells during lung development

G Carraro, A Shrestha, J Rostkovius… - …, 2014 - journals.biologists.com
G Carraro, A Shrestha, J Rostkovius, A Contreras, CM Chao, E El Agha, B MacKenzie
Development, 2014journals.biologists.com
The regulation of the balance between proliferation and differentiation in the mesenchymal
compartment of the lung is largely uncharacterized, unlike its epithelial counterpart. In this
study, we determined that miR-142-3p contributes to the proper proliferation of
mesenchymal progenitors by controlling the level of WNT signaling. miR-142-3p can
physically bind to adenomatous polyposis coli mRNA, functioning to regulate its expression
level. In miR-142-3p loss-of-function experiments, proliferation of parabronchial smooth …
The regulation of the balance between proliferation and differentiation in the mesenchymal compartment of the lung is largely uncharacterized, unlike its epithelial counterpart. In this study, we determined that miR-142-3p contributes to the proper proliferation of mesenchymal progenitors by controlling the level of WNT signaling. miR-142-3p can physically bind to adenomatous polyposis coli mRNA, functioning to regulate its expression level. In miR-142-3p loss-of-function experiments, proliferation of parabronchial smooth muscle cell progenitors is significantly impaired, leading to premature differentiation. Activation of WNT signaling in the mesenchyme, or Apc loss of function, can both rescue miR-142-3p knockdown. These findings show that in the embryonic lung mesenchyme, the microRNA machinery modulates the level of WNT signaling, adding an extra layer of control in the feedback loop between FGFR2C and β-catenin-mediated WNT signaling.
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