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Involvement of mTOR kinase in cytokine-dependent microglial activation and cell proliferation

Cinzia Dello Russo1, Lucia Lisi, Giuseppe Tringali

  • 1Institute of Pharmacology, Catholic University Medical School, Largo F. Vito 1, Rome, Italy. cinzia.dellorusso@rm.unicatt.it

Biochemical Pharmacology
|July 7, 2009
PubMed

Insights

The mechanistic target of rapamycin (mTOR) pathway regulates microglial activation and viability. Inhibiting mTOR reduces pro-inflammatory cytokine-induced microglial responses, suggesting potential therapeutic applications for neuroinflammation.

Area of Science:

  • Neuroscience
  • Immunology
  • Cell Biology

Background:

  • Neuroinflammation, driven by microglial cells, is central to neurodegenerative diseases like Multiple Sclerosis.
  • Microglia release cytotoxic mediators, such as nitric oxide (NO), contributing to brain inflammation.
  • The mTOR signaling pathway is implicated in innate immune cell activation, including microglia.

Purpose of the Study:

  • To investigate the role of mTOR signaling in the activation of primary rat cortical microglia.
  • To determine the effect of mTOR inhibition on microglial responses to inflammatory stimuli.
  • To assess the impact of mTOR on microglial viability and proliferation.

Main Methods:

  • Primary rat cortical microglia cultures were treated with lipopolysaccharide (LPS) or a cytokine mixture.
  • Mammalian target of rapamycin (mTOR) activation was detected.
  • The effects of mTOR inhibitors (including RAD001) on nitric oxide synthase (NOS) activity, NOS2 expression, cyclooxygenase levels, cell proliferation, and viability were evaluated.
  • Astrocyte responses were also assessed for comparison.

Main Results:

  • mTOR activation was observed in microglia stimulated by both LPS and cytokines.
  • mTOR inhibitors reduced cytokine-induced NOS activity and NOS2 expression, but not LPS-induced effects.
  • RAD001, combined with cytokines, decreased microglial proliferation and cyclooxygenase levels.
  • mTOR inhibition significantly reduced microglial viability under basal conditions.
  • mTOR inhibitors had no significant effect on astrocyte NOS2 activity or viability.

Conclusions:

  • mTOR signaling selectively modulates microglial activation in response to pro-inflammatory cytokines.
  • mTOR plays a critical role in maintaining microglial viability.
  • mTOR inhibitors represent a potential therapeutic strategy for mitigating neuroinflammation in conditions like Multiple Sclerosis.

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