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Nicotine Motivated Behavior in C. elegans.

Chinnu Salim1, Enkhzul Batsaikhan1, Ann Ke Kan1

  • 1Department of Pharmacology, Addiction Science and Toxicology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN 38163, USA.

International Journal of Molecular Sciences
|February 10, 2024
PubMed
Summary

This study introduces a nicotine conditioned cue preference (CCP) model in C. elegans to investigate nicotine dependence. The findings reveal conserved genetic mechanisms underlying nicotine seeking behaviors across species.

Keywords:
C. elegansmotivated behaviornicotine

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Area of Science:

  • Neuroscience
  • Genetics
  • Behavioral Pharmacology

Background:

  • Nicotine dependence is a complex disorder with significant public health implications.
  • High-throughput (HTP) model organisms offer advantages for dissecting the genetic underpinnings of complex behaviors.
  • Caenorhabditis elegans possesses a well-defined neuroconnectome suitable for HTP behavioral studies.

Purpose of the Study:

  • To establish and utilize a nicotine conditioned cue preference (CCP) paradigm in C. elegans.
  • To investigate the genetic basis of nicotine-motivated behaviors and nicotine seeking.
  • To validate the cross-species relevance of candidate genes associated with nicotine dependence.

Main Methods:

  • Development of the nicotine CCP paradigm in C. elegans for assessing nicotine preference and seeking.
  • Pharmacological assessment of nicotinic acetylcholine receptors (nAChRs) and dopamine involvement in CCP.
  • Genetic screening to identify nAChR subunits and validate human GWAS candidates (e.g., CACNA2D3, CACNA2D2 orthologs).

Main Results:

  • Nicotine CCP in C. elegans successfully models fundamental aspects of mammalian nicotine dependence.
  • Nicotine-elicited cue preference is mediated by nAChRs and requires dopamine.
  • Functional validation confirmed the conserved role of the calcium channel α2δ subunit in nicotine-motivated behavior, linking C. elegans findings to human GWAS data.

Conclusions:

  • The C. elegans nicotine CCP paradigm is a powerful HTP tool for studying nicotine dependence.
  • This model validates the functional conservation of GWAS candidate genes involved in nicotine seeking.
  • The study provides a simplified yet comprehensive framework for investigating complex behavioral paradigms and their genetic basis.