It’s in Your Mind: Addiction as a Chronic Brain...
Transcript of It’s in Your Mind: Addiction as a Chronic Brain...
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It’s in Your Mind: Addiction as a Chronic Brain Disease
Marvin D. Seppala, MD
Chief Medical Officer
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Addiction is Characterized by:
Compulsion to seek and take the drug
Loss of control in limiting intake
Diminished recognition of significant problems
Emergence of negative emotional state
Craving
Chronicity and relapse
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Addiction is a Brain Disease
NOT:
Secondary to another psychiatric illness
A moral or ethical problem
A personality disorder
A choice
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Genetic Vulnerability
Estimated genetic risk 40-60%
Multiple genes are involved with drug responses
A few genes have been identified that
are protective
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Environmental Risk Factors Consistently Related to Risk of Self Administration
Low socioeconomic class
Poor parental support
Drug availability
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Environmental Risk Factors
Stress is a common feature among environmental risk
factors, both for initiation of use and relapse.
Co-occurring psychiatric illness and a history of
trauma increase the risk of addiction and of relapse.
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The Brain
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The Human Brain – A Detailed ExaminationThe Human Brain – A Detailed Examination
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Mesolimbic Dopamine System (Median Forebrain Bundle)
Brain Reward Center
1
1
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NEURONS &
NEUROTRANSMISSION
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“An Irreproducible System”
“An Irreproducible System”
A human may have 100 billion neurons, with an
estimated 100 trillion (100,000,000,000,000)
connections
“Neuron and nerve cell are synonyms that refer to the
major information-conveying cells in the nervous
system.”
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More about Neurons
The Neuron: Its Four Parts
1. Dendrites: “receives signals from other nerve cells and
relay them to the cell body”
Dendrites can vary from 2 or 3 up to 10,000 in a purkinje cell in
the cerebellum, which can have as many as 150,000
connections
2. Cell body: Nucleus with genes of the cell
3. Axon: “carries the message from the cell body”
4. Terminal: “relay the message to the dendrites, cell
body, or even terminals of the next cell”
Length of a Neurons
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Neurons (Nerve Cells)
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Signal Conduction
Signal Conduction
Neurons do not touch each other in conducting a signal from
one to the other
A “synapse, synaptic gap” or “synaptic cleft” exists
between them
This gap is 15-50 nanometers (nm)
A nanometer is one billionth of a meter
A million synaptic gap widths added together
barely total an inch
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Signal Conduction
(“Some synaptic gaps are one tenth the width of normal synapses. At these junctures the signal is
transmitted electrically”)
Signal Conduction
Signals are transmitted electrically within the neuron
But once the signal reaches the synapse, it stops, so a
microscopic chemical called a neurotransmitter crosses
the synapse
Neurotransmitters are produced in the neuron, stored in
sacs called “vesicles”
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The Most common Neurtransmitters
Acetylcholine
Norepinephrine
Epinephrine
Dopamine
Endorphin
Enkephalin
Serotonin
GABA
Substance “P”
Anandamide
Glycine
Histamine
Nitric oxide
Glutamic acid
Cortisone
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The Synapse
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• “Excitatory” neurotransmitters: “augment the potential for
signal propagation in the post-synaptic neurons”: i.e.,
decrease polarity across the membrane (depolarization).
• “Inhibitory” neurotransmitters, “prevent the propagation of
the action potential” i.e., increase polarity (hyperpolarize)
• “The specificity of a particular neurotransmitter (whether it
acts in an excitatory or inhibitory fashion) is normally an
inherent property of the transmitter itself.”
Two Types of Neurotransmitters
“Excitatory” neurotransmitters: augment the potential for signal
propagation in the post-synaptic neurons; they increase the
likelihood of an electric signal
“Inhibitory” neurotransmitters, prevent the propagation of the
action potential; they decrease the likelihood of an electric
signal
The specificity of a particular neurotransmitter (whether it acts
in an excitatory or inhibitory fashion) is normally an inherent
property of the neurotransmitter itself.
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THE
NEUROTRANSMITTERS
ROLE IN ADDICTION
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Addictive Drugs Are Associated With Specific Neurotransmitters
Drugs Neurotransmitter System Action
Alcohol Facilitates GABA receptor function
Inhibits NMDA (Glutamate) receptor function
Marijuana Agonist at CB1 and CB2 cannabinoid receptors
Cocaine Indirect agonist of dopamine receptors by inhibiting
dopamine transporters
Amphetamine Indirect agonist of dopamine receptors by
stimulating dopamine release
Opiates Agonist at MU, delta and kappa receptors
Nicotine Agonist at nicotinic acetylcholine receptors
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NIDA Slide 7, 8
Normal Dopamine Release
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Dopamine Release
Due to Cocaine
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Normal Receptor Function
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Alcohol and Neurotransmitters
GABA
Primary inhibitory neurotransmitter
Decreases with chronic use
Glutamate:
Primary excitatory neurotransmitter
Increases with chronic use
Opioids:
Alcohol stimulates endorphin release
Dopamine:
Alcohol stimulates release, directly and via endorphins
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Neuroadaptation (Neuroplasticity)
Repeated exposure
Changes in nuclear function
Altered transcription of target genes
(abnormal proteins or receptors)
Altered activity of the neuron
(neurotransmitter dysregulation)
Altered reward curcuitry
Altered behavior (Loss of control)
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ADDICTION: A BRAIN
DISEASE
Addiction is a Disorder of… Incentive salience
Reward deficit
Stress surfeit
Executive function
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Addiction ≠ Casual Use
Compulsion to seek and take the drug
Loss of control in limiting intake
Diminished recognition of significant problems
Emergence of negative emotional state
Craving
Chronicity and relapse
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Acute Intoxication: Primarily Reward Circuitry
A Hedonic activity
Positive reinforcement
All drugs of abuse enhance dopamine release
Mesolimbic dopamine system
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Neurochemical Circuits in Drug Reward (Acute)
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Drug Action Where
Cocaine/
Amphetamine
Release dopamine by direct
action on dopamine terminals
Nucleus Accumbens
Amygdala
Opioids Activate opioid receptors VTA, Nucleus Accumbens
Amygdala
Facilitate dopamine release VTA, Nucleus Accumbens
Alcohol Actives GABA receptors or
GABA release
VTA, Nucleus Accumbens
Amygdala
Facilitates release of opioid
peptides
VTA, Nucleus Accumbens
Amygdala
Facilitates release of dopamine Nucleus Accumbens
Nicotine Actives nicotine acetylcholine
receptors
VTA, Nucleus Accumbens
Amygdala
Cannabinoids Actives cannabinoid CB1
receptors
VTA, Nucleus Accumbens
Amygdala
Facilitates release of dopamine Nucleus Accumbens
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Establishment of the Addictive Cycle
Positive Reinforcement from the drug diminished
Negative Reinforcement from the drug increases
Motivational withdrawal syndrome established
Incentive salience narrows the individuals focus
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The Addictive Cycle
The transition to addiction from casual drug use involves
the brain areas associated with these three stages
Binge / Intoxication
Withdrawal / Negative Affect
Preoccupation / Anticipation (craving)
Three Stages
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Neural Circuits of the Binge/Intoxication Stage
Incentive Salience
• euphoria
• intoxication
• cue learning
• habits
Doral Striatum
Nucleus
accumbens
Thalamus
Globus Pallidus
Koob GF. Volkow ND.
Neuropsychopharmacol Rev, 2010, 35:217-238.
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Neural Circuits of the Withdrawal/Negative Affect Stage
Negative Affect
• dysphoria
• anxiety
• irritability
• malaise
Amygdala
Bed Nucleus of the Stria Terminalls
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Neural Circuits of the Preoccupation/Anticipation “Craving” Stage
Executive Dysfunction
• impulsivity
• compulsivity
• sleep disturbances
• impaired decision
making
Stress
Affective state
Incentive to action
Stimulus value Action
Value/cost
Anticipation/Availability
Context
Action inhibition
Emotion control
Outcome valuation
Drub subjective value
External context
Internal context
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Summary
Addiction is a chronic brain disease and the
manifestations that we find so puzzling are
best understood by examining the
neurobiological underpinnings. We can
come to understand the behaviors
associated with addiction by understanding
the brain pathology.
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Resources
Neurocircuitry of Addiction
Koob, Volkow: Neuropsychopharmacol Reviews (2010) 35, 217-238
Dynamics of Neuronal Circuits in Addiction
Koob Pharmacopsychiatry 2009; 42 (Suppl 1): S32
Neuropathology of Substance Use Disorders
Cadet, Bisagno, Milray Acta Neuropathol (2014) 127; 91-107