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Adolescents are more vulnerable to cocaine addiction : behavioral and electrophysiological evidence

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posted on 2014-09-17, 11:15 authored by Wai Chong Wong, Kerstin A. Ford, Nicole E. Pagels, James E. McCutcheon, Michela Marinelli
In humans, adolescence is a period of heightened propensity to develop cocaine addiction. It is unknown whether this is attributable to greater access and exposure to cocaine at this age, or whether the adolescent brain is particularly vulnerable to the addictive properties of cocaine. Here, we subjected male adolescent (P42) and adult (∼P88) rats to a wide range of cocaine self-administration procedures. In addition, to determine whether behavioral differences are associated with developmental differences in dopaminergic activity, we examined and manipulated the activity of dopamine neurons. Relative to adults, adolescent rats took cocaine more readily, were more sensitive to lower doses, showed greater escalation of cocaine intake, and were less susceptible to increases in price (i.e., were more “inelastic”). In parallel, adolescents also showed elevated activity of ventral tegmental area dopamine neurons, a feature known to be associated with increased self-administration behavior. Pharmacological manipulation of dopamine D2 receptor function with quinpirole (agonist) or eticlopride (antagonist), to alter dopamine neuron activity, eliminated age differences in cocaine self-administration. These data suggest a causal relationship between behavioral and electrophysiological determinants of cocaine addiction liability. In conclusion, adolescents show behavioral and electrophysiological traits of heightened addiction liability.

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Citation

Journal of Neuroscience, 2013, 33 (11), pp. 4913-4922

Author affiliation

/Organisation/COLLEGE OF MEDICINE, BIOLOGICAL SCIENCES AND PSYCHOLOGY/School of Biological Sciences/Department of Cell Physiology and Pharmacology

Version

  • VoR (Version of Record)

Published in

Journal of Neuroscience

Publisher

Society for Neuroscience

issn

0270-6474

eissn

1529-2401

Copyright date

2013

Available date

2014-09-17

Publisher version

http://www.jneurosci.org/content/33/11/4913

Language

en

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