The Science of Drug Addiction: Implications for Clinical Practice
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1 The Science of Drug Addiction: Implications for Clinical Practice Jack B. Stein, Ph.D. Director Office of Science Policy and Communications National Institute on Drug Abuse National Institutes of Health Department of Health and Human Services Chief Resident Immersion Training Program May 2013
2 Scope of Substance Use in the U.S. Frequent Use In Specialty Treatment ~ 2,300,000 Addiction Diagnosis ~ 23,000,000 (Diabetes ~24,000,000) Harmful Use ~60,000,000 are Use Little or No Use Source: A. T. McLellan, 2011
3 percent Shifting Landscape of Drug Abuse Over Time 60 % Students Reporting Any Illicit Drug Use in Past Year, by Grade th Grade 10th Grade 12th Grade
4 percent Relative Shifts in Prevalence % Students Reporting Past Month Marijuana and Cigarettes (by Grade) Marijuana-8th Marijuana-10th Marijuana-12th Cigarettes-8th Cigarettes-10th Cigarettes-12th SOURCE: University of Michigan, 2011 Monitoring the Future Study
5 Changes in Attitude Lead to Changes in Use: Marijuana Use and Perceived Risk in 12 th Graders Percent Percent Past Year Use use Perceived Risk Perceived Risk Source: Monitoring the Future, 2011
6 percent Synthetic Drugs % of Students Reporting Synthetic Marijuana Use Annually (by Gender) th Grade 12th - Male 12th - Female
7 Drug Overdose Death Rates in USA More Than Tripled Since 1990 (Nearly 17,000 in 2010). Deaths per 100,000 population 25 Motor Vehicle Traffic Poisoning Drug Poisoning (Overdose) Year More OD Deaths than MVA Deaths Since 2009 NCHS Data Brief, December, 2011, Updated with 2009 and 2010 mortality data Motor vehicle traffic, poisoning, and drug poisoning (overdose) death rates: United States,
8 Increases in Opioid Deaths Parallel Opioid Sales and Treatment Admissions Rate Opioid Sales KG/10,000 Opioid Deaths/100,000 Opioid Treatment Admissions/10, Year National Vital Statistics System, DEA s Automation of Reports and Consolidated Orders System, SAMHSA s TEDS
9 Estimated Economic Cost to Society Due to Substance Use Disorders Tobacco: Alcohol: Illegal drugs: Total: $193 billion/year $235 billion/year $181 billion/year $609 billion/year Source: ONDCP, 20CDC, 2007; Rehm et al., 2009 Lancet 373:
10 Advances in neuroscience have revolutionized our fundamental understanding of drug abuse and addiction.
11
12 The Brain on Drugs Front of brain 1-2 Min YELLOW shows places in brain where cocaine binds (Striatum) Back of brain
13 Addiction is a Disease of the Brain Decreased Brain Metabolism in SUD Patient High Control Cocaine Abuser Decreased Heart Metabolism in Heart Disease Patient Low Healthy Heart Diseased Heart Sources: From the laboratories of Drs. N. Volkow and H. Schelbert
14 Addiction is Like Many Other Diseases Addiction is preventable Addiction is treatable Recovery is possible
15 NIDA Priority Areas Prevention Genetics Environment Development Treatment Neurobiology Interventions Policy Neural mechanisms Brain circuitry Medications Development Implementation Consequences HIV/AIDS Fetal Exposure
16 Why do some people become addicted to drugs while others do not?
17 Development of Addiction Involve Multiple Factors Biology Genes/Development Environment DRUG/ALCOHOL USE Brain Mechanisms Addiction
18 Susceptibility to Addiction Results from Interaction of Many Genes FAAH - associated with drug dependence OPRM1 - associated with opiates and alcoholism CYP2A6, CYP2B6 - associated with smoking and smoking cessation ALDH2 - associated with protection against alcoholism DBH (Dopamine beta-hydroxylase) cocaine-induced paranoia DRD2, DRD4 (Dopamine receptors) - reward, craving NrCAM, neurexins (Cell adhesions genes) - assoc with drug abuse and addiction Prodynorphin gene - associated with protection against cocaine dependence Nicotinic alpha 7 promoter assoc. with decreased expression of its message in different brains regions and with sensory gating defects in schizophrenics -- Alpha 5 and beta 3 (nicotinic receptors) assoc. with nicotine dependence -- 5HT1B (serotonin receptor) - associated with conduct disorder and alcoholism
19 Genetic Variability and Effects of Drugs
20 What Environmental Factors Contribute to Addiction? Drug availability Peers who use drugs Family Problems Early physical or sexual abuse Stress in general
21 Effects of a Social Stressor on Brain Dopamine D2 Receptors and Propensity to Administer Drugs Individually Housed Group Housed 50 Dominant Subordinate Becomes Dominant No longer stressed * * Social Setting Can Change Neurobiology 10 Becomes Subordinate Stress remains 0 S Cocaine (mg/kg/injection) Morgan, D. et al. Nature Neuroscience, 2002.
22 Adverse Childhood Experiences (ACE) and Illicit Drug Use Odds ratio Ever Addicted ACE Score (n = 8603) ACE is associated with ½ to 2/3 of serious problems with drug use. SR Dube, et al. PEDIATRICS 111: , 2003
23 Hazard Rate Addiction Is Developmental DSM-IV Abuse DSM-IV Dependence Age Age of Onset of Drug Abuse and Dependence Source: Compton, et al. Archives of General Psychiatry NESARC Study.
24 What Does Science Tell Us About Effective Prevention Programs?
25 Effective Prevention Programs Reduce these Elevate these
26 Nurse Home Visiting Program (prenatal-age 2) Percent of Children Who Used Tobacco, Alcohol, or Marijuana (Last 30 Days) 6 Child Age 12 5 Percent of Children with Internalizing Problems (Borderline or Clinical) 6 Child Age Nurse Comparison 0 Nurse Comparison PIAT Scores - Reading & Math Age 12 (Born to Low-Resource Mothers) 90 Percent of Mothers with Role Impairment due to Alcohol or Drug Use Child Age Nurse Comparison 0 Nurse Comparison Arch Pediatr Adoles Med, 164(5) , 2010
27 NIDA Priority Areas Prevention Genetics Environment Development Treatment Neurobiology Interventions Policy Neural mechanisms Brain circuitry Medications Development Implementation Consequences HIV/AIDS Fetal Exposure
28 Neuronal Circuits Involved In Drug Abuse and Addiction EXECUTIVE FUNCTION/ INHIBITORY CONTROL OFC MOTIVATION/ DRIVE PFC SCC ACG NAcc Amy g Hipp VP REWARD MEMORY/ LEARNING
29 1. Reward Circuit NAcc REWARD VP Drugs of Abuse Engage Systems in the Motivation Pathways of the Brain
30 % of Basal DA Output DA Concentration (% Baseline) Natural Rewards Elevate Dopamine Levels 200 Food NAc shell 200 Sex Empty Box Feeding Time (min) Female Present Sample Number Di Chiara et al., Neuroscience, 1999.,Fiorino and Phillips, J. Neuroscience, 1997.
31 % of Basal Release % of Basal Release % of Basal Release % of Basal Release Drugs Elevate Dopamine Levels More/Longer AMPHETAMINE Hrs. after amphetamine COCAINE Hrs. after cocaine NICOTINE MORPHINE Hrs. after nicotine Hrs. after morphine Source: Di Chiara and
32 The Neuron: How the Brain s Messaging System Works
33
34 dopamine transporters
35
36 Dopamine Receptors Lower in Addiction Cocaine Alcohol Heroin control addicted
37 Cutting Edge Research: Brain Changes Leading to Cocaine Addiction Increased interaction between proteins in the nucleus accumbens may result in enhanced responsiveness (reward) to cocaine. Bonci, et al (2013), Cell
38 2. Memory circuit Hipp Amyg MEMORY/ LEARNING People, places and things
39 Signal Intensity (AU) Cocaine Craving: Population (Cocaine Users, Controls) x Film (cocaine ) Cingulate Ant Cing IFG Controls Cocaine Users CRIT/FIT Garavan 2013 et al A.J. Psych 2000 Cocaine Film
40 Signal Intensity (AU) Cocaine Craving: Population (Cocaine Users, Controls) x Film (cocaine, erotic) Cingulate Ant Cing IFG Controls Cocaine Users CRIT/FIT Garavan 2013 et al A.J. Psych 2000
41 Even Unconscious Cues Can Elicit Brain Responses Brain Regions Activated by 33 millisecond cocaine cues (too fast for conscious recognition) Childress, et al., PLoS ONE 2008
42 3. Motivation & Executive Control Circuits EXECUTIVE FUNCTION INHIBITORY CONTROL PFC ACG OFC SCC MOTIVATION/ DRIVE Dopamine is also associated with motivation and executive function via regulation of frontal activity.
43 The fine balance in connections that normally exists between brain areas active in reward, motivation, learning and memory, and inhibitory control EXECUTIVE FUNCTION INHIBITORY CONTROL PFC OFC MOTIVATION/ DRIVE ACG SCC NAcc Amyg Hipp VP REWARD MEMORY/ LEARNING Becomes severely disrupted in ADDICTION
44 Non-Addicted Brain Addicted Brain Control Control CG STOP Saliency NAc Drive OFC Saliency Drive GO Memory Amygdala Memory
45 Addiction is Treatable Partial Recovery of Brain Dopamine Transporters in Abuser After Protracted Abstinence 3 0 ml/gm Normal Control METH Abuser (1 month detox) METH Abuser (14 months detox) Source: Volkow, CRIT/FIT ND et al., 2013 Journal of Neuroscience 21, , 2001.
46 Behavioral Treatments Non-Addicted Addicted Brain Brain Control Control Interfere with drug s reinforcing effects Executive function/ Inhibitory control Contingency Management Cognitive Therapy Saliency Saliency Drive STOP GO Drive Strengthen prefrontalstriatal communication Motivation Therapies Memory Memory Interfere with conditioned memories Teach new memories Biofeedback Desensitization Behavioral Therapies Counteract stress responses that lead to relapse Relaxation Behavioral therapies
47 Medication Assisted Treatments Non-Addicted Addicted Brain Brain Control Control Interfere with drug s reinforcing effects Executive function/ Inhibitory control Vaccines Enzymatic degradation Naltrexone DA D3 antagonists CB 1 antagonists Biofeedback Modafinil Bupropion Stimulants Saliency Saliency Drive STOP GO Drive Strengthen prefrontalstriatal communication Adenosine A2 antagonists DA D3 antagonists Memory Memory Interfere with conditioned memories Teach new memories Antiepileptic GVG N-acetylcysteine Cycloserine Counteract stress responses that lead to relapse CRF antagonists Orexin antagonists
48 Vivitrol Significantly Increases % of Patients with Opioid-free Weeks
49 A Double-Blind RCT of N-Acetylcysteine in Cannabis-Dependent Adolescents Proportion of Negative Urine Cannabinoid Tests Over Time Among Cannabis-Dependent Adolescents Gray KM et al., AJP June 15, 2012.
50 Extended-Release Mixed Amphetamine Salts and Topiramate for Cocaine Dependence Combination of MAS-ER and topiramate was superior to placebo in achieving 3 week abstinence in cocainedependent individuals Mariani et al., Biol Psychiatry 2012
51 Genetic Variability and Personalized Treatment
52 Anti- Drug Vaccine Development Capillary Blood Flow Antibody holds drug in blood stream Brain
53 Cutting Edge Research: Targeted Stimulation of the Pre-frontal Cortex as a Promising Treatment for Cocaine Addiction Optogenetic stimulation results in: - reduced cocaine-seeking in addicted rats - increased cocaine seeking in non-addicted rats -Evidence for a cocaine-induced deficit within a brain region involved in addictive disorders -Rapid translation to clinical human trials via noninvasive brain stimulation Chen, et al (2013), Nature
54 Translating Research into Practice Access and Engagement Organization Structure and Climate Intervention Provider knowledge and behavior External Environment (stigma, financing)
55 Receipt of SUD Services Lags Behind other Chronic Disorders Any Mental Illness 45.9 million Substance Use Disorder 23.1 million Diabetes 25.8 million Heart Disease 81.1 million Hypertension 74.5 million 39.2 % receiving treatment 11.2 % receiving treatment 84 % receiving treatment 74.6 % receiving screenings 70.4 % receiving treatment
56 Low Uptake of Pharmacotherapy in Specialty Programs in 2007 As % of all programs surveyed (N=345) Within adopting programs, % of eligible patients receiving Rx Psychiatric meds Opioid tx meds: Methadone Buprenorphine Tablet naltrexone Alcohol meds: Disulfiram Tablet naltrexone Acamprosate Injectable naltrexone 15.9 (too new to report) Knudsen et al, 2011, J Addict Med; 5:
57 National Drug Abuse Treatment Clinical Trials Network (CTN) NIDA Criminal Justice Drug Abuse Treatment Studies (CJ-DATS) CTN Sites Research Centers
58 Medications and Criminal Justice Populations Methadone Experiment: 6 Mo Post Release (N=201) 100 Community-based Tx days % Opioid Test Positive Crime Days Release Referral to Methadone Treatment Methadone Treatment on Release Methadone both Pre- & Post-Release -- signif. diff from referral -- signif. diff from treatment only on release Source: Gordon, M.S., Kinlock, T.W., Schwartz, R.P., O Grady, K.E. (2008). Addiction. A Randomized Clinical Trial of Methadone Maintenance for Prisoners: Findings at 6-Months Post-Release.
59 Affordable Care Act (ACA) Extends coverage to more than 30 million persons, many at high risk for drug abuse Promotes use of electronic health records Fundamentally changes the ways drug abuse prevention and treatment services are financed Focuses on screening and prevention Emphasizes central role of primary care settings
60 NIDA Priority Areas Prevention Genetics Environment Development Treatment Neurobiology Interventions Policy Neural mechanisms Brain circuitry Medications Development Implementation Consequences HIV/AIDS Fetal Exposure
61 HAART as HIV Prevention NIDA Avant Garde 2008: Dr. Julio Montaner, Univ. of British Columbia Montaner et al., Lancet 2008
62 Centers of Excellence Boston University Drexel/University of Pennsylvania University of Massachusetts Tufts University University of North Dakota Creigton University Screening tools CMEs on prescription drug abuse
63 Thanks! Drugabuse.gov
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