Activation of the mammalian target of rapamycin (mTOR) is essential for oligodendrocyte differentiation

Related Experiment Video

Updated: Jun 23, 2026

Preparation of Rat Oligodendrocyte Progenitor Cultures and Quantification of Oligodendrogenesis Using Dual-infrared Fluorescence Scanning
11:11

Preparation of Rat Oligodendrocyte Progenitor Cultures and Quantification of Oligodendrogenesis Using Dual-infrared Fluorescence Scanning

Published on: February 17, 2016

William A Tyler1, Nitish Gangoli, Pradeepa Gokina

  • 1Department of Neurology & Neuroscience, New Jersey Medical School, University of Medicine and Dentistry of New Jersey, Newark, New Jersey 07101-1709, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|May 15, 2009
PubMed

Insights

Activation of the mammalian target of rapamycin (mTOR) is crucial for oligodendrocyte differentiation, regulating the transition from progenitor to immature cells and impacting myelination. mTOR signaling through mTORC1 and mTORC2 complexes is essential for this process.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Signal Transduction

Background:

  • Oligodendrocyte differentiation and maturation are complex processes influenced by various factors.
  • Intracellular signaling pathways controlling oligodendrocyte commitment remain incompletely understood.

Purpose of the Study:

  • To investigate the role of the mammalian target of rapamycin (mTOR) signaling pathway in oligodendrocyte differentiation.
  • To elucidate the specific mTOR complexes (mTORC1 and mTORC2) involved in regulating oligodendrocyte differentiation and myelination.

Main Methods:

  • Assessing oligodendrocyte differentiation via stage-specific antigens and myelin protein expression (MBP, PLP).
  • Utilizing siRNA-mediated knockdown of raptor and rictor to disrupt mTOR complex formation.
  • Analyzing differential phosphorylation of mTORC1 and mTORC2 targets.
  • Employing OPC-DRG co-cultures to study the effects of mTOR inhibition on differentiation and myelination.

Main Results:

  • mTOR activation is essential for oligodendrocyte differentiation, particularly at the late progenitor to immature oligodendrocyte stage.
  • Phosphorylation of mTOR at Ser 2448 correlates with myelination in the developing brain's subcortical white matter.
  • Disruption of mTORC1 or mTORC2 complexes significantly reduced myelin protein expression in vitro.
  • mTORC2 uniquely controlled myelin gene expression at the mRNA level, while mTORC1 influenced MBP expression through a different mechanism.
  • mTOR inhibition abrogated oligodendrocyte differentiation and reduced myelin segment formation in OPC-DRG co-cultures.

Conclusions:

  • The mammalian target of rapamycin (mTOR) pathway is a critical regulator of oligodendrocyte differentiation commitment.
  • mTOR signaling, via both mTORC1 and mTORC2, plays a vital role in the transition to immature oligodendrocytes and subsequent myelination.
  • These findings highlight mTOR as a key intracellular regulator preceding myelination.

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