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NF1 Is a Direct G Protein Effector Essential for Opioid Signaling to Ras in the Striatum.

Keqiang Xie1, Lesley A Colgan2, Maria T Dao3

  • 1Department of Neuroscience, The Scripps Research Institute, 130 Scripps Way, Jupiter, FL 33458, USA.

Current Biology : CB
|October 25, 2016
PubMed
Summary

Neurofibromin 1 (NF1) directly links G-protein-coupled receptors (GPCRs) to Ras pathways in the brain. This finding reveals a new mechanism in opioid addiction.

Keywords:
G proteinsGPCR signalingaddictionneurofibromatosisopioidsstriatum

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pharmacology

Background:

  • G-protein-coupled receptors (GPCRs) modulate neuronal function through Ras-regulated kinase pathways, but the precise signaling mechanisms and their link to brain disorders remain unclear.
  • Understanding how GPCRs signal to Ras pathways is crucial for deciphering neuronal plasticity and developing treatments for neurological and psychiatric conditions.

Purpose of the Study:

  • To identify novel effectors of GPCR signaling in the striatum.
  • To elucidate the role of neurofibromin 1 (NF1) in mediating GPCR-induced Ras activation.
  • To investigate the contribution of the NF1-Ras pathway to the effects of opioids.

Main Methods:

  • Utilized biochemical assays to assess the interaction between Gβγ subunits and neurofibromin 1 (NF1).
  • Employed genetic manipulation (NF1 deletion) in striatal neurons of mice.
  • Measured Ras activation and downstream signaling (Akt-mTOR pathway) following opioid receptor stimulation.
  • Assessed behavioral responses (psychomotor activity, reward) to morphine in mice with altered NF1 function.

Main Results:

  • Identified neurofibromin 1 (NF1) as a direct Gβγ effector in striatal GPCR signaling, where Gβγ binding inhibits NF1's Ras inactivation.
  • Demonstrated that NF1 deletion in striatal neurons blocks opioid-receptor-induced Ras activation and abrogates downstream Akt-mTOR signaling.
  • Showed that NF1 in striatal medium spiny neurons regulates opioid-induced Ras activity, enhancing sensitivity to morphine's psychomotor and rewarding effects.

Conclusions:

  • Established a novel mechanism of GPCR signal transduction to Ras pathways involving NF1 as a key molecular switch.
  • Highlighted the critical role of NF1 in the striatum for mediating the cellular and behavioral effects of opioids.
  • Positioned NF1 as a potential therapeutic target for conditions associated with opioid addiction and dysregulated Ras signaling.