Increased Energy “It sustains and refreshes both body and brain...... in the same space of time more than double the amount of work could be undergone...”

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Presentation transcript:

Increased Energy “It sustains and refreshes both body and brain in the same space of time more than double the amount of work could be undergone...” Sears, Roebuck, and Co. Consumers Guide, 1900 Euphoria “.....exhilarating and lasting euphoria.... You perceive increase in self-control and possess more vitality and capacity for work.” Sigmund Freud, 1884 Replace Natural Reward "A coke shot...it's like... injectable sex, an orgasm in every cell.” Craving “I found I was taking money meant to buy presents for my children.” Paranoia “He thought he was being forcibly electrocuted and could see electric wires leading to his body.” Transition to Addiction Good to Bad

Searching for the Neurobiological Basis of Addiction Molecular site of action Physiology of neuronal plasticity Environmental influence

Drugs of Abuse Stimulate Mesoaccumbens Dopamine

Aphysiologic Release of Dopamine

Motivation to Action

Physiological Activation of Dopamine Novel stimulus regardless of valence Changes in intensity of a known stimulus regardless of valence Tolerance develops upon repeated exposure of a given stimulus. Promotes neural plasticity to establish adaptive responses

Dopamine Establishes Adaptive Behavioral Responses Effect of a Novel versus a Familiar Stimulus

Searching for the Neurobiological Basis of Transition to Addiction Molecular site of action Physiology of neuronal plasticity Environmental influence

Neuroplasticity in Dopamine Transmission Increased releasability of dopamine (depends on calcium transduction) Increased post-synaptic dopamine signals (D1 receptors) Morphological changes to increase synaptic contact Long-term changes in gene expression D1 PKA fos/fra NAC-1 CREB CaMKII Homer1a PPD DAT Dopamine Cocaine Calcium VDCC

Cocaine Alters Gene Expression Causing Changes in Glutamate Transmission Increased GluR1 (enhances Ca conductance at AMPA receptors) Increased Narp (enhances AMPA signaling) Increased Homer1a (inhibits mGluR1,5 signaling) Decreased Homer1bc and mGluR5 (inhibits mGluR1,5 signaling) Increased PPD (dynorphin inhibits glutamate release)

Glutamatergic Afferents to the Accumbens

Searching for the Neurobiological Basis of Transition to Addiction Molecular site of action Physiology of neuronal plasticity Environmental influence

PET/fMRI of Cocaine Craving Childress et al., 1999; Am.J.Psychiat

Self-administration of Cocaine

Glutamate receptor antagonism in the accumbens blocks cocaine-induced relapse

Effect of Acute versus Chronic Cocaine

How does all of this help? Molecular site of action Manipulate dopamine transmission (dopamine agonist/antagonist; transport blockers; calcium conductance) Physiology of neural plasticity Biological markers for vulnerability to addiction (gene expression altered by challenge) Inoculate against addiction related neuroplasticity (vector mediated inhibition or promotion of gene expression) Environmental influence Modulate circuitry adjacent to dopamine synapses (glutamate antagonists or GABA agonists)