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Foxm1 controls a pro-stemness microRNA network in neural stem cells.

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A novel molecular network involving Hedgehog-Gli (Hh-Gli) signaling, Nanog, and Foxm1 controls cerebellar neural stem cell (NSC) self-renewal. This pathway regulates microRNAs essential for neurosphere formation.

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Area of Science:

  • Neuroscience
  • Stem Cell Biology
  • Molecular Biology

Background:

  • Cerebellar neural stem cells (NSCs) rely on Hedgehog-Gli (Hh-Gli) signaling for maintenance.
  • Nanog expression is crucial for the self-renewal of these NSCs.

Purpose of the Study:

  • To uncover novel molecular regulators of cerebellar NSC self-renewal.
  • To elucidate the regulatory network controlling NSC maintenance and self-renewal.

Main Methods:

  • Next-generation sequencing was employed to profile mRNA and microRNA expression in NSCs and differentiated NSCs (Diff-NSCs).
  • Gene expression analysis identified key regulatory genes and microRNAs.
  • Functional assays, including knockdown experiments, assessed the impact on neurosphere formation.

Main Results:

  • Foxm1 was identified as a gene upregulated in NSCs, directly regulated by Gli and Nanog.
  • Foxm1 was found to regulate specific microRNAs (miR-130b, miR-301a, miR-15~16, miR-17~92 clusters) overexpressed in NSCs.
  • Knockdown of these microRNAs significantly impaired neurosphere formation ability.

Conclusions:

  • A novel regulatory network, driven by Hh-Gli, Nanog, and Foxm1, controls cerebellar NSC self-renewal.
  • This network involves specific microRNAs crucial for maintaining NSC self-renewal capacity.
  • The findings provide new insights into the molecular mechanisms governing neural stem cell maintenance.