Target regulation of PI3K/Akt/mTOR pathway by cannabidiol in treatment of experimental multiple sclerosis

Sabrina Giacoppo, Federica Pollastro, Gianpaolo Grassi, Placido Bramanti, Emanuela Mazzon

Research output: Contribution to journalArticlepeer-review

Abstract

This study was aimed to investigate whether treatment with purified cannabidiol (CBD) may counteract the development of experimental multiple sclerosis (MS), by targeting the PI3K/Akt/mTOR pathway. Although the PI3K/Akt/mTOR pathway was found to be activated by cannabinoids in several immune and non-immune cells, currently, there is no data about the effects of CBD in the PI3K/Akt/mTOR activity in MS. Experimental Autoimmune Encephalomyelitis (EAE), the most common model of MS, was induced in C57BL/6 mice by immunization with myelin oligodendroglial glycoprotein peptide (MOG)35-55. After EAE onset, which occurs approximately 14days after disease induction, mice were daily intraperitoneally treated with CBD (10mg/kg mouse) and observed for clinical signs of EAE. At 28days from EAE-induction, mice were euthanized and spinal cord tissues were sampled to perform immunohistochemical evaluations and western blot analysis. Our results showed a clear downregulation of the PI3K/Akt/mTOR pathway following EAE induction. CBD treatment was able to restore it, increasing significantly the phosphorylation of PI3K, Akt and mTOR. Also, an increased level of BNDF in CBD-treated mice seems to be involved in the activation of PI3K/Akt/mTOR pathway. In addition, our data demonstrated that therapeutic efficacy of CBD treatment is due to reduction of pro-inflammatory cytokines, like IFN-γ and IL-17 together with an up-regulation of PPARγ. Finally, CBD was found to promote neuronal survival by inhibiting JNK and p38 MAP kinases. These results provide an interesting discovery about the regulation of the PI3K/Akt/mTOR pathway by cannabidiol administration, that could be a new potential therapeutic target for MS management.

Original languageEnglish
Pages (from-to)77-84
Number of pages8
JournalFitoterapia
Volume116
DOIs
Publication statusE-pub ahead of print - Nov 24 2016

Keywords

  • Animals
  • Brain-Derived Neurotrophic Factor
  • Cannabidiol
  • Encephalomyelitis, Autoimmune, Experimental
  • Interferon-gamma
  • Interleukin-17
  • JNK Mitogen-Activated Protein Kinases
  • Male
  • Mice
  • Mice, Inbred C57BL
  • PPAR gamma
  • Phosphatidylinositol 3-Kinases
  • Phosphorylation
  • Proto-Oncogene Proteins c-akt
  • Signal Transduction
  • TOR Serine-Threonine Kinases
  • p38 Mitogen-Activated Protein Kinases
  • Journal Article

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