Self-administration by female rats of low doses of nicotine alone vs. nicotine in tobacco smoke extract.

Journal Article (Journal Article)

BACKGROUND: Nicotine has reinforcing effects, but there are thousands of other compounds in tobacco, some of which might interact with nicotine reinforcement. AIMS: This rat study was conducted to determine if nicotine self-administration is altered by co-administration of the complex mixture of compounds in tobacco smoke extract (TSE). METHODS: Female Sprague-Dawley rats were tested for self-administration of low doses of nicotine (3 or 10 µg/kg/infusion) at three different rates of reinforcement (FR1, FR3 and FR5) over three weeks either alone or together with the complex mixture of tobacco smoke extract (TSE). RESULTS: Rats self-administering 3 µg/kg/infusion of nicotine alone showed a rapid initiation on an FR1 schedule, but declined with FR5. Rats self-administering nicotine in TSE acquired self-administration more slowly, but increased responding over the course of the study. With 10 µg/kg/infusion rats self-administered significantly more nicotine alone than rats self-administering the same nicotine dose in TSE. Rats self-administering nicotine alone took significantly more infusions with the 10 than the 3 µg/kg/infusion dose, whereas rats self-administering nicotine in TSE did not. Nicotine in TSE led to a significantly greater locomotor hyperactivity at a dose of 0.1 mg/kg compared to rats that received nicotine alone. Rats self-administering nicotine alone had significantly more responding on the active vs. inactive lever, but rats self-administering the same nicotine doses in TSE did not. CONCLUSIONS: Self-administration of nicotine in a purer form appears to be more clearly discriminated and dose-related than nicotine self-administered in the complex mixture of TSE.

Full Text

Duke Authors

Cited Authors

  • Levin, ED; Wells, C; Pace, C; Abass, G; Hawkey, A; Holloway, Z; Rezvani, AH; Rose, JE

Published Date

  • November 1, 2021

Published In

Volume / Issue

  • 228 /

Start / End Page

  • 109073 -

PubMed ID

  • 34600263

Electronic International Standard Serial Number (EISSN)

  • 1879-0046

Digital Object Identifier (DOI)

  • 10.1016/j.drugalcdep.2021.109073

Language

  • eng

Conference Location

  • Ireland