psychiatric disorders - science in the news · 2015. 6. 12. · cross-disorder group of the...
TRANSCRIPT
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Psychiatric Disorders
Learning about the brain from diagnosis to treatment
Tedi Asher Harvard Medical School
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Talk overview
Part I: Defining psychiatric disorders
Part II: Biological underpinnings of depression
Part III: The future of psychiatric diagnosis and treatment
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adapted from NIH
Psychiatric disorders affect everyone
Race
Perc
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Differentiating health from disorder… a tricky business A
nxie
ty
Sub
stan
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se
Del
usio
ns
Intensity
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What are psychiatric disorders?
Currently, psychiatric disorders
are diagnosed according to the
Diagnostic and Statistical
Manual of Mental Disorders
(DSM), published by the
American Psychiatric Association
(APA).
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DSM-5
What are psychiatric disorders? The DSM-5 definition
“… a syndrome characterized by clinically significant disturbance in an individual’s cognition, emotion regulation, or behavior that reflects a dysfunction in the psychological, biological, or developmental processes underlying mental function.”
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DSM-5
Some difficulties with this definition…
“… a syndrome characterized by clinically significant disturbance in an individual’s cognition, emotion regulation, or behavior that reflects a dysfunction in the psychological, biological, or developmental processes underlying mental function.”
A group of symptoms – no biological definition
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DSM-5
Some difficulties with this definition…
“… a syndrome characterized by clinically significant disturbance in an individual’s cognition, emotion regulation, or behavior that reflects a dysfunction in the psychological, biological, or developmental processes underlying mental function.”
How do we measure this?
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The result is… categorically defined disorders
Depression
Schizophrenia
ADHD
Autism Bipolar Disorder
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Defining depression (Major Depressive Disorder)
Depression
According to the DSM, 5+ of the following symptoms must be present for 2 weeks:
1. Depressed mood every day 2. Diminished pleasure / interest in daily activities every day 3. Significant change in weight
4. Insomnia or hypersomnia every day
5. Psychomotor agitation or retardation every day
6. Fatigue every day
7. Feelings of worthlessness and excessive guilt
8. Decreased ability to concentrate
9. Recurrent thoughts of death
DSM-5
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The result is… categorically defined disorders
Depression
Schizophrenia
ADHD
Autism Bipolar Disorder
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The result is… categorically defined disorders
Bipolar Disorder
A disorder affecting adults characterized by…
Depressive episodes: e.g. sadness, anxiety, guilt, hopelessness
Manic episodes: e.g. elevated/irritable mood, racing thoughts, easily distracted
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The result is… categorically defined disorders
Schizophrenia
“Positive” symptoms: e.g. hallucinations, delusions, disorganized thinking
“Negative” symptoms: e.g. avolition, diminished emotional expression
A disorder affecting young adults characterized by…
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The result is… categorically defined disorders
ADHD
A behavioral disorder affecting children characterized by…
Attention deficits
Hyperactivity
Impulsiveness
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The result is… categorically defined disorders
Autism
A disorder affecting young children characterized by…
Impaired social interaction
Impaired verbal and non-verbal communication
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Depression
Schizophrenia
ADHD
Autism Bipolar Disorder
What do we know about the underlying biology?
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Defining depression (Major Depressive Disorder)
Depression
5+ of the following symptoms present for 2 weeks: 1. Depressed mood every day 2. Diminished pleasure / interest in daily activities every day 3. Significant change in weight
4. Insomnia or hypersomnia every day
5. Psychomotor agitation or retardation every day
6. Fatigue every day
7. Feelings of worthlessness and excessive guilt
8. Decreased ability to concentrate
9. Recurrent thoughts of death
DSM-5
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Antidepressant drugs
Depressed Less
Depressed
Antidepressant
• Later replaced by selective serotonin reuptake inhibitors (SSRI’s), e.g. Prozac
• Tricyclic antidepressants (TCA’s), e.g. Imipramine: first treatment for depression
How???
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Questions?
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Antidepressant drugs: How do they work?
Depressed Less
Depressed
Antidepressant
How???
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The brain is composed of cells called neurons
Axon
Neuron
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Neural circuits are composed of neurons that communicate using chemical signals called neurotransmitters
Neuron Other Neuron Neurotransmitter
Synapse Axon
Circuit
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Serotonin Neuron Other Neuron
Serotonin
Antidepressants target the serotonin neurotransmitter system
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Normally, serotonin is taken back up by the cell that released it through the serotonin transporter
Serotonin Transporter
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Antidepressants block reuptake of serotonin into cells and allow serotonin to continue interacting with other neurons
Antidepressant Drug
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Antidepressant
Depressed Less
Depressed
Antidepressant drugs increase serotonin levels outside the cell…
… and decrease depressive symptoms
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The serotonin hypothesis of depression
Serotonin Depression
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Short Long
Gene associations suggest a link between serotonin and depression
Serotonin Transporter
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Adapted from Caspi, 2003, Science
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.20
.30
.40
.50
0 1 2 3 4
Number of stressful life events
Prob
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Gene variants of serotonin transporter correlate with rates of depression in humans
Short Long
Short
Long
The serotonin system is associated with depression
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But… antidepressant efficacy is relatively low
Serotonin can’t be the whole picture
Depressed Less
Depressed Not
Depressed
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Novel therapeutics target multiple neural systems
Dopamine
Serotonin
Norepinephrine
Even the newest therapies aren’t completely effective… are we treating the right thing?
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Questioning the definition of psychiatric disease
Depression
Schizophrenia
ADHD
Autism Bipolar Disorder
How accurately do psychiatric diagnoses reflect the underlying biology?
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Cross-Disorder Group of the Psychiatric Genomics, C., & Genetic Risk Outcome of Psychiatric Disorders, Lancet, 2013
GWAS studies show that these psychiatric disorders share genetic components
Depression
Schizophrenia
ADHD
Autism Bipolar Disorder
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The reality… shared symptoms and genetics
Depression
Schizophrenia
ADHD
Autism Bipolar Disorder
Perhaps a symptom-based system is not the best diagnostic approach….
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http://www.nimh.nih.gov/research-priorities/rdoc/rdoc-constructs.shtml#potential_threat
Toward a new biologically-based diagnostic approach: RDoC
Behavior Brain Circuit Cell
Molecules
Genes
Trait: Anxiety
Biological Complexity
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Summary
• Psychiatric disorders are currently defined by symptoms
• Much of what we understand about the biology of psychiatric disorders comes from experience with pharmacotherapies
• The current aim is to develop a biologically-based system for diagnosing psychiatric disorders
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Thank you! SITN would like to acknowledge the following
organizations for their generous support of this event.
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Questions?