NOX1/NADPH Oxidase Promotes Synaptic Facilitation Induced by Repeated D₂ Receptor Stimulation: Involvement in...

Area of Science:

• Neuroscience
• Molecular Biology
• Psychiatry

Background:

• Repetitive behavior is a key neuropsychiatric symptom, often linked to abnormal dopaminergic signaling in the striatum.
• The precise molecular mechanisms underlying dopamine-induced repetitive behavior remain unclear.
• Understanding these mechanisms is crucial for developing treatments for compulsive disorders.

Purpose of the Study:

• To investigate the role of NADPH oxidase 1 (NOX1) in mediating repetitive behavior induced by dopamine D2 receptor stimulation.
• To elucidate the molecular pathways through which NOX1 influences synaptic plasticity in the striatum.
• To explore NOX1 as a potential therapeutic target for compulsive behaviors.

Main Methods:

• Utilized C57Bl/6J mice with genetic deletion or pharmacological inhibition of NOX1.
• Administered repeated D2 receptor stimulation to induce repetitive and perseverative behaviors.
• Performed electrophysiological analyses to assess excitatory synaptic inputs in striatal medium spiny neurons (iMSNs).
• Investigated the effects of NOX1 on protein tyrosine phosphatase activity and Src kinase activation.

Main Results:

• NOX1 deficiency or inhibition significantly reduced D2 receptor stimulation-induced repetitive behavior.
• Repeated D2 receptor stimulation upregulated NOX1 expression specifically in the central striatum (CS).
• NOX1 facilitates excitatory synaptic inputs onto CS iMSNs by modulating Src kinase signaling.
• Inhibition of NOX1 or beta-arrestin ameliorated repetitive behaviors.

Conclusions:

• NOX1 acts as a critical enhancer of synaptic facilitation in the central striatum.
• NOX1 provides a molecular link between abnormal dopamine signaling and the induction of repetitive and perseverative behaviors.
• Targeting NOX1 in the striatum may offer a novel therapeutic strategy for compulsive disorders.