Panacea Index Logo

Command Palette

Search for a command to run...

Behavioral economics of polysubstance use: The role of orexin-1 receptors in nicotine-induced augmentation of synthetic opioid consumption.

Neuropharmacology
April 15, 2025
Sarah C Honeycutt et al. (6 authors)
Journal ArticleAnimal Study
Study Details

Study Goal

The researchers aimed to determine how developmental nicotine exposure and acute nicotine administration affect motivation for opioid consumption, particularly through the orexin system.

Results Summary

The study found that adolescent nicotine exposure (ANE) increased motivation for opioid consumption in adulthood, which was further exacerbated by acute nicotine administration (ANA). ORX1R antagonism was more effective in reducing opioid motivation in nicotine-exposed rats compared to controls.

Population

Rodents (rats)

Effective Dosage

Not specified

Duration

Not specified

Interactions

None mentioned

Extracted Claims (6)
InterventionDirectionEndpointPopulationDosageImpactClaim #
ongoing nicotine administration
increase
opioid consumption
rodents and humans
-
facilitates
#1
former exposure to nicotine solely during adolescence
increase
opioid consumption
-
-
augments
#2
adolescent nicotine exposure (ANE)
increase
multiple indices of the motivational value of RMF
rats
-
augment
#3
acute nicotine administration (ANA)
increase
effects of ANE on motivational value of RMF
rats
-
exacerbated
#4
systemic antagonism of ORX1Rs with SB-334867
decrease
motivation for RMF
nicotine-exposed rats
-
more efficacious in limiting
#5
systemic antagonism of ORX1Rs with SB-334867
decrease
limiting motivation for RMF
rats in ANA conditions
-
differential efficacy was even greater
#6
Abstract

Nicotine and opioid use disorders are highly comorbid in clinical populations. Ongoing nicotine administration facilitates opioid consumption in both rodents and humans. Moreover, preclinical studies support that former exposure to nicotine solely during adolescence augments opioid consumption in adulthood similarly to acute nicotine administration. This suggests that developmental nicotine exposure persistently alters the neural substrates underlying motivation in a manner that resembles the acute pharmacological actions of nicotine. The orexin system mediates motivation to consume opioids in large part through signaling at orexin-1 receptors (ORX1Rs). Both developmental nicotine exposure and acute nicotine administration profoundly alter functioning of the orexin system which may mediate the reinforcing enhancing properties of nicotine. Here, we used behavioral economic procedures to generate demand curves for consumption of the synthetic, short-acting, μ-opioid receptor agonist remifentanil (RMF) in adulthood following prior adolescent nicotine exposure (ANE) and again following reintroduction of acute nicotine administration (ANA). We found that ANE was sufficient to augment multiple indices of the motivational value of RMF in adulthood and these effects were further exacerbated by ANA given during RMF self-administration sessions. Additionally, we demonstrate that systemic antagonism of ORX1Rs with SB-334867 is more efficacious in limiting motivation for RMF in nicotine-exposed rats relative to controls and this differential efficacy was even greater in ANA conditions relative to former ANE. These findings support that nicotine-induced facilitation of orexin signaling may mechanistically contribute to augmented opioid consumption offering critical insight for treatment options for a population that is particularly vulnerable to developing opioid use disorder.

Study Links
Quality Scores
SafetyNot Assessed
Efficacy75/10
Quality85/10
Research Impact Scores
APT Score0.05
Weight Score2.02
Normalized Score0.67
Related Supplements