Targeting GluN2B/NO Pathway Ameliorates Social Isolation-Induced Exacerbated Attack Behavior in Mice

Area of Science:

• Neuroscience
• Pharmacology
• Behavioral Science

Background:

• Escalated attack behavior has significant socioeconomic and social consequences.
• No effective clinical treatments are currently available for escalated attack behavior.
• Social isolation (SI), prevalent during pandemics, may increase attack behavior and negatively impact mental health.

Purpose of the Study:

• To investigate therapeutic strategies for mitigating social isolation-induced heightened attack behavior.
• To explore the role of the GluN2B/nitric oxide (NO) signaling pathway in social isolation-induced attack behavior.

Main Methods:

• Pharmacological interventions targeting the GluN2B subunit and NO signaling pathway.
• Administration of ifenprodil and TAT-9C peptide (GluN2B inhibitors).
• Manipulation of nitric oxide levels using L-arginine (potentiator) and L-NAME/7-NI (inhibitors).

Main Results:

• Inhibition of GluN2B with ifenprodil or TAT-9C significantly reduced SI-induced escalated attack behavior and aberrant brain nitric oxide (NO) levels.
• Potentiation of NO levels by L-arginine reversed the mitigating effects of GluN2B inhibition.
• Combined administration of subeffective doses of NO inhibitors (L-NAME, 7-NI) with GluN2B inhibitors further decreased attack behavior and NO levels.

Conclusions:

• The GluN2B/NO signaling pathway is a critical modulator of social isolation-induced escalated attack behavior.
• Targeting the GluN2B/NO pathway offers a potential therapeutic strategy for managing heightened aggression linked to social isolation.