The neurokinin-1 receptor in addictive processes

Area of Science:

• Neuroscience
• Pharmacology
• Addiction Research

Background:

• Stress significantly impacts drug-seeking behaviors, including increased self-administration and reward.
• Neuropeptides, particularly corticotropin-releasing hormone (CRH), mediate stress-induced drug behaviors across various substances.
• The substance P (SP) and neurokinin-1 receptor (NK1R) system also plays a crucial role in stress and anxiety, with emerging evidence linking it to drug-related behaviors.

Purpose of the Study:

• To review the role of the neurokinin-1 receptor (NK1R) system in drug-seeking behaviors.
• To highlight recent clinical findings on NK1R as a potential therapeutic target for addiction.

Main Methods:

• Literature review of studies investigating neuropeptide involvement in stress and drug-seeking.
• Analysis of research on corticotropin-releasing hormone (CRH) and substance P/neurokinin-1 receptor (SP/NK1R) systems.
• Examination of clinical study results regarding NK1R inhibition and its effects on drug use.

Main Results:

• CRH mediates stress-induced drug seeking, escalated self-administration, and withdrawal, but not baseline or cue-induced reinstatement.
• The SP/NK1R system modulates stress and anxiety and influences drug-taking and drug-seeking behaviors similarly to CRH.
• NK1R inhibition reduces escalated alcohol self-administration and stress-induced reinstatement of alcohol and cocaine seeking.
• Unlike other stress systems, NK1R appears involved in the primary reward and reinforcement of opiates.

Conclusions:

• The neurokinin-1 receptor (NK1R) system is implicated in various aspects of drug-seeking behavior, particularly in response to stress.
• NK1R inhibition demonstrates potential in attenuating escalated drug use and stress-induced relapse.
• The NK1R represents a promising therapeutic target for developing novel treatments for substance use disorders.