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MANF Is Essential for Neurite Extension and Neuronal Migration in the Developing Cortex.

Kuan-Yin Tseng1,2, Tatiana Danilova1, Andrii Domanskyi1

  • 1Program in Developmental Biology, Institute of Biotechnology, University of Helsinki, Helsinki, 00014, Finland.

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Summary

Mesencephalic astrocyte-derived neurotrophic factor (MANF) is vital for mammalian neurogenesis. MANF deficiency impairs neurite growth and neuronal migration during cortical development.

Keywords:
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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cell Biology

Background:

  • Mesencephalic astrocyte-derived neurotrophic factor (MANF) is an endoplasmic reticulum (ER) protein with known neuroprotective effects.
  • MANF expression patterns are altered during rodent cortical development, but its role in neurogenesis remains unclear.

Purpose of the Study:

  • To investigate the function of MANF in neural stem cell (NSC) proliferation, differentiation, and overall mammalian cerebral cortex development.

Main Methods:

  • Utilized cell culture to assess MANF-deficient NSCs' proliferation and differentiation.
  • Conducted in vivo studies to observe the effects of MANF removal on neuronal migration and neurite outgrowth.
  • Performed mechanistic studies to explore the molecular pathways affected by MANF deficiency.

Main Results:

  • MANF is highly expressed in developing neural lineage cells, including NSCs.
  • MANF-deficient NSCs exhibit normal proliferation but impaired neurite extension upon differentiation.
  • In vivo, MANF deficiency results in delayed neuronal migration and reduced neurite outgrowth.
  • Mechanistic studies revealed reduced de novo protein synthesis and activated unfolded protein response (UPR) pathways in MANF-deficient cells.

Conclusions:

  • MANF is a critical regulator of neurite growth and neuronal migration in mammalian cortical development.
  • This study identifies MANF as a novel factor influencing key aspects of neurogenesis and brain development.