論文

査読有り
2019年12月10日

Hedgehog-related genes regulate reactivation of quiescent neural progenitors in Caenorhabditis elegans

Biochemical and Biophysical Research Communications
  • Masahiko Kume
  • ,
  • Hirohisa Chiyoda
  • ,
  • Kenji Kontani
  • ,
  • Toshiaki Katada
  • ,
  • Masamitsu Fukuyama

520
3
開始ページ
532
終了ページ
537
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.bbrc.2019.10.045

© 2019 Elsevier Inc. The animal body contains various types of stem and progenitor cells. These undifferentiated cells coordinate the balance between quiescence and proliferation with dynamics of various physiological conditions such as the developmental stage, food availability, and injury. Although regulation of such coordination plays a critical role in maintaining tissue homeostasis, controlling the growth rate and regeneration, much of its mechanism remains elusive. Newly hatched Caenorhabditis elegans larvae possess quiescent stem and progenitor cells in several tissues, and these cells are reactivated by the insulin/insulin-like growth factor (IGF) signaling (IIS) pathway only when sufficient food is supplied. Maintenance of the quiescence of neuronal and mesodermal progenitor cells requires microRNA (miRNA), miR-235, which is upregulated under the starvation. On the other hand, feeding ample food downregulates the miRNA via the activity of the IIS pathway. As miR-235 in the hypodermis can non-autonomously regulate quiescence of neuronal and mesodermal progenitor cells, a cell-cell signaling pathway has been hypothesized to act downstream of the miRNA. Here, we provide evidence that two hedgehog-related (hh-r) genes, grl-5 and grl-7, are targets of miR-235 that promote reactivation of quiescent neuroblasts. These grl genes possess an miR-235 binding site on 3ʹUTRs of their transcripts, and are upregulated in starved mir-235 mutant larvae. grl-5 and grl-7 promoters can continuously drive the expression of GFP-pest reporter protein in the hypodermis under the fed condition. However, expression of these reporters is strikingly downregulated under the starvation condition after hatching. We found that miR-235 can repress expression of reporter genes via the predicted miR-235 binding sites on the grl-5 and grl-7 3ʹUTRs. Furthermore, activity of grl-5 and grl-7 genes are required for reactivation of neural progenitor cells in starved mir-235 mutant larvae. These findings suggest that the IIS pathway-miR-235 signaling in the hypodermis non-autonomously regulates quiescence of neural progenitor cells, partly via grl-5 and grl-7.

リンク情報
DOI
https://doi.org/10.1016/j.bbrc.2019.10.045
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/31615656
Scopus
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85073228708&origin=inward
Scopus Citedby
https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85073228708&origin=inward
ID情報
  • DOI : 10.1016/j.bbrc.2019.10.045
  • ISSN : 0006-291X
  • eISSN : 1090-2104
  • PubMed ID : 31615656
  • SCOPUS ID : 85073228708

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