N-Oleoyl-glycine reduces nicotine reward and withdrawal in mice

Area of Science:

• Neuroscience
• Biochemistry
• Pharmacology

Background:

• The insular cortex plays a role in nicotine addiction.
• Traumatic brain injury (TBI) in the insular cortex can lead to smoking cessation.
• Investigating molecules affected by TBI may reveal new addiction treatments.

Purpose of the Study:

• To explore if molecules sensitive to TBI in the insular cortex can ameliorate nicotine addiction.
• To investigate the effects of N-oleoyl-glycine (OlGly), a lipid increased by TBI, on nicotine addiction in mice.

Main Methods:

• Targeted lipidomics to identify TBI-induced lipids in the mouse insular cortex.
• Administration of OlGly to nicotine-dependent mice to assess withdrawal responses.
• Conditioned place preference (CPP) paradigm to evaluate nicotine's rewarding effects.
• In vitro and in vivo experiments to determine OlGly's mechanism of action involving peroxisome proliferator-activated receptor alpha (PPAR-α).

Main Results:

• TBI significantly increased N-oleoyl-glycine (OlGly) levels in the mouse insular cortex.
• Systemic OlGly administration reduced nicotine withdrawal symptoms and prevented nicotine-induced conditioned place preference (CPP).
• OlGly's effects were specific to nicotine reward, as it did not affect morphine CPP.
• OlGly activated PPAR-α, and a PPAR-α antagonist blocked OlGly's anti-nicotine reward effects.

Conclusions:

• N-oleoyl-glycine (OlGly) attenuates nicotine reward and withdrawal, suggesting a potential therapeutic role in treating nicotine addiction.
• OlGly acts as a functional PPAR-α agonist to reduce the rewarding effects of nicotine.
• These findings highlight OlGly as a promising candidate for developing novel treatments for smoking cessation.