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Updated: Apr 26, 2026
Preparation of Rat Oligodendrocyte Progenitor Cultures and Quantification of Oligodendrogenesis Using Dual-infrared Fluorescence Scanning
Published on: February 17, 2016
Interaction of mTOR and Erk1/2 signaling to regulate oligodendrocyte differentiation
JinXiang Dai1, Kathryn K Bercury, Wendy B Macklin
1Department of Cell and Developmental Biology, University of Colorado School of Medicine, Aurora, Colorado.
Abstract:
A multitude of factors regulate oligodendrocyte differentiation and remyelination, and to elucidate the mechanisms underlying this process, we analyzed the interactions of known signaling pathways involved in these processes. Previous work from our lab and others shows that Akt, mTOR, and Erk 1/2 are major signaling pathways regulating oligodendrocyte differentiation and myelination in vitro and in vivo. However, the relative contribution of the different pathways has been difficult to establish because the impact of inhibiting one pathway in in vitro cell culture models or in vivo may alter signaling through the other pathway. These studies were undertaken to clarify the interactions between these major pathways and understand more specifically the crosstalk between them. Oligodendrocyte differentiation in vitro required Akt, mTOR, and Erk 1/2 signaling, as inhibition of Akt, mTOR, or Erk 1/2 resulted in a significant decrease of myelin basic protein mRNA and protein expression. Interestingly, while inhibition of the Erk1/2 pathway had little impact on Akt/mTOR signaling, inhibition of the Akt/mTOR pathways significantly increased Erk1/2 signaling, although not enough to overcome the loss of Akt/mTOR signaling in the regulation of oligodendrocyte differentiation. Furthermore, such crosstalk was also noted in an in vivo context, after mTOR inhibition by rapamycin treatment of perinatal pups. GLIA 2014;62:2096-2109.
Insights
Akt, mTOR, and Erk 1/2 signaling pathways are crucial for oligodendrocyte differentiation and myelination. Inhibiting Akt/mTOR increases Erk 1/2 signaling, revealing complex crosstalk that impacts myelin development.
Area of Science:
- Neuroscience
- Cell Biology
- Developmental Biology
Background:
- Oligodendrocyte differentiation and remyelination are vital for central nervous system function.
- Akt, mTOR, and Erk 1/2 are key signaling pathways implicated in these processes.
- Understanding the interplay between these pathways is crucial for elucidating regulatory mechanisms.
Purpose of the Study:
- To investigate the interactions and crosstalk between Akt, mTOR, and Erk 1/2 signaling pathways in oligodendrocyte differentiation.
- To clarify the relative contributions of these pathways to myelination.
- To determine if observed pathway interactions in vitro translate to an in vivo context.
Main Methods:
- Inhibition of Akt, mTOR, or Erk 1/2 signaling pathways in oligodendrocyte precursor cells in vitro.
- Assessment of myelin basic protein (MBP) mRNA and protein expression following pathway inhibition.
- Pharmacological inhibition of mTOR using rapamycin in perinatal pups to study in vivo pathway crosstalk.
Main Results:
- Inhibition of Akt, mTOR, or Erk 1/2 significantly decreased MBP expression, confirming their requirement for oligodendrocyte differentiation.
- Erk 1/2 pathway inhibition minimally affected Akt/mTOR signaling.
- Akt/mTOR pathway inhibition led to increased Erk 1/2 signaling, though insufficient to rescue differentiation.
- Similar crosstalk between mTOR and Erk 1/2 pathways was observed in vivo.
Conclusions:
- Akt, mTOR, and Erk 1/2 signaling are essential for oligodendrocyte differentiation and myelination.
- A significant crosstalk exists where Akt/mTOR inhibition enhances Erk 1/2 signaling, highlighting pathway interdependence.
- These findings provide critical insights into the complex regulatory network governing myelin development in the central nervous system.
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