Dopaminergic neurons, originating in the midbrain, and projecting to forebrain areas including the prefontral cortex, amygdala, and nucleus accumbens are critical for the manifestation of goal directed behavior for both natural rewards and drugs of abuse. While the exact role DAergic transmission plays in goal-directed behavior is still under investigation, one particularly attractive hypothesis is that DAergic neurons act as a learning signal to code relationships between reinforcers and environmental cues that predict them. Although both in vivo electrophysiological and electrochemical studies have demonstrated that DAergic signaling is plastic, and can be modified by manipulating the learned association between cues and reinforcers, little is known about the cellular changes that occur in DAergic neurons following stimulus-reward learning. The proposed experiments plan to examine whether the properties and plasticity of excitatory synapses on DAergic neurons are altered following reward-related learning and extinction. These studies will further the understanding of how dopaminergic signaling is involved in reinforcement and conditioning.

Agency
National Institute of Health (NIH)
Institute
National Institute on Drug Abuse (NIDA)
Type
Postdoctoral Individual National Research Service Award (F32)
Project #
5F32DA021937-03
Application #
7493021
Study Section
Human Development Research Subcommittee (NIDA)
Program Officer
Avila, Albert
Project Start
2006-09-01
Project End
2009-08-31
Budget Start
2008-09-01
Budget End
2009-08-31
Support Year
3
Fiscal Year
2008
Total Cost
$50,428
Indirect Cost
Name
Ernest Gallo Clinic and Research Center
Department
Type
DUNS #
173995366
City
Emeryville
State
CA
Country
United States
Zip Code
94608
Stuber, Garret D; Klanker, Marianne; de Ridder, Bram et al. (2008) Reward-predictive cues enhance excitatory synaptic strength onto midbrain dopamine neurons. Science 321:1690-2
Stuber, Garret D; Hopf, F Woodward; Hahn, Junghyun et al. (2008) Voluntary ethanol intake enhances excitatory synaptic strength in the ventral tegmental area. Alcohol Clin Exp Res 32:1714-20