SLIDE 6 3/12/2016 6
Addiction as an organic brain disease
- Disrupted voluntary behavioral control
- Supraphysiologic dopamine release at nucleus
accumbens
Massive reward
Volkow N et al. Neurobiologic Advances from the Brain Disease Model of Addiction. N Engl J Med 2016; 374:363-371 Jan 28, 2016
Natural Reward Elevates Dopamine Levels
50 100 150 200 60 120 180
Time (min)
% of Basal DA Output Empty Box Feeding
Source: Di Chiara et al.
100 150 200 DA Concentration (% Baseline)
Mounts Intromissions Ejaculations Source: Fiorino and Phillips
SEX FOOD
100 200 300 400 500 600 700 800 900 1000 1100 1 2 3 4 5 hr Time After Amphetamine % of Basal Release DA DOPAC HVA Accumbens AMPHETAMINE 100 200 300 400 1 2 3 4 5 hr Time After Cocaine % of Basal Release DA DOPAC HVA Accumbens
COCAINE
100 150 200 250 1 2 3 4 5hr Time After Morphine % of Basal Release Accumbens 0.5 1.0 2.5 10
Dose (mg/kg)
MORPHINE
100 150 200 250 1 2 3 hr Time After Nicotine % of Basal Release Accumbens Caudate
NICOTINE
Source: Di Chiara and Imperato
Effects of drugs on dopamine release
Addiction as an organic brain disease
- Disrupted voluntary behavioral control
- Supraphysiologic Dopamine release at nucleus
accumbens
Massive reward Increased salience
- Over time, diminished intrinsic dopamine release in
limbic system
Baseline dysphoric state with decreased reward and
salience from natural reward stimuli
- Diminished dopamine and glutamate release in
frontal cortex
Decreased executive function, impulse control
Volkow N et al. Neurobiologic Advances from the Brain Disease Model of Addiction. N Engl J Med 2016; 374:363-371 Jan 28, 2016