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Description : Check out this medical presentation on Neurology, which is titled "Drug Abuse & Addiction", to know about Drug Abuse and Addiction.

Tags : Neurology, Drug Abuse, Addiction

Published on : Aug 23, 2021 | Views : 4213 | Downloads : 7

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Slide 1-

Bringing the Full Power of Science to Bear on
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Homelessness Crime Violence Neurotoxicity AIDS, Cancer Mental illness Health care Productivity Accidents
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4 Out of 10 U.S. AIDS Deaths Are Related to Drug Abuse
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Estimated Economic Cost to Society Due to Substance Abuse and Addiction: Illegal drugs: $181 billion/year Alcohol: $185 billion/year Tobacco: $158 billion/year Total: $524 billion/year Surgeon General’s Report, 2004; ONDCP, 2004; Harwood, 2000.
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What is Addiction? Addiction is A Brain Disease Characterized by: Compulsive Behavior Continued abuse of drugs despite negative consequences Persistent changes in the brain’s structure and function
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Advances in science have revolutionized our fundamental views of drug abuse and addiction.
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Your Brain on Drugs in the 1980’s
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Your Brain on Drugs Today YELLOW shows places in brain where cocaine binds (e.g., striatum) Fowler et al., Synapse, 1989.
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Addiction is Like Other Diseases… It is preventable It is treatable It changes biology If untreated, it can last a lifetime Healthy Brain Diseased Heart Decreased Heart Metabolism in Heart Disease Patient
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Addiction Involves Multiple Factors
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National Epidemiologic Survey on Alcohol and Related Conditions, 2003. Age 0.0% 0.0% 0.2% 0.2% 0.4% 0.4% 0.6% 0.6% 0.8% 0.8% 1.0% 1.0% 1.2% 1.2% 1.4% 1.4% 1.6% 1.6% 1.8% 1.8% 5 5 10 10 15 15 21 21 25 25 30 30 35 35 40 40 45 45 50 50 55 55 60 60 65 65 % in each age group who develop first-time dependence CANNABIS ALCOHOL TOBACCO Addiction Is A Developmental Disease that starts in adolescence and childhood
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Why Do People Take Drugs in The First Place? To Feel Good To have novel: feelings sensations experiences AND to share them To Feel Better To lessen: anxiety worries fears depression hopelessness
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Drugs of Abuse Engage Motivation and Pleasure Pathways of the Brain Why Do People Abuse Drugs?
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Drugs can be “Imposters” of Brain Messages
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Addiction Reward & well-being Motivation Movement Dopamine
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Donald Bliss, MAPB, Medical Illustration The Neuron: How the Brain’s Messaging System Works Terminal branches of axon Cell body (the cell’s life support center) Dendrites Myelin sheath Axon Neuronal Impulse
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dopamine transporters
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Di Chiara et al., Neuroscience, 1999.,Fiorino and Phillips, J. Neuroscience, 1997. Natural Rewards Elevate Dopamine Levels 0 50 100 150 200 0 60 120 180 Time (min) % of Basal DA Output NAc shell Empty Food Sex Box Feeding 100 150 200 DA Concentration (% Baseline) Sample Number Female Present
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Amphetamine Cocaine Time After Drug Morphine Nicotine Di Chiara and Imperato, PNAS, 1988 Effects of Drugs on Dopamine Release
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But Dopamine is only Part of the Story Scientific research has shown that other neurotransmitter systems are also affected: Serotonin Regulates mood, sleep, etc. Glutamate Regulates learning and memory, etc.
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Prolonged Drug Use Changes the Brain In Fundamental and Long-Lasting Ways Science Has Generated Much Evidence Showing That…
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We Have Evidence That These Changes Can Be Both Structural and Functional AND…
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Amph Neuronal Dendrites in the Nucleus Accumbens Saline Robinson & Kolb, Journal of Neuroscience, Volume: 1997 Structurally…
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Control Addicted Dopamine D2 Receptors are Decreased by Addiction Functionally… DA D2 Receptor Availability Cocaine Alcohol Heroin Meth
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Dopamine Transporters in Methamphetamine Abusers Normal Control Methamphetamine Abuser Motor Task Loss of dopamine transporters in methamphetamine abusers may result in slowing of motor reactions. Memory Task Loss of dopamine transporters in methamphetamine abusers may result in memory impairment. 7 8 9 10 11 12 13 1.0 1.2 1.4 1.6 1.8 2.0 Time Gait (seconds) 4 6 8 10 12 14 16 1.0 1.2 1.4 1.6 1.8 2.0 Delayed Recall (words remembered) Dopamine Transporter Bmax/Kd Volkow et al., Am. J. Psychiatry, 2001.
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Implication? Brain changes resulting from prolonged use of drugs may compromise mental AND motor function.
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Circuits Involved In Drug Abuse and Addiction All of these brain regions must be considered in developing strategies to effectively treat addiction
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Prevention Research (Children & Adolescents) genetics environment development co-morbidity Priority Areas for NIDA Treatment Research (New Targets & New Strategies) HIV/AIDS Research
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Addiction is a Developmental Disease: It Starts Early First Marijuana Use, (Percent of Initiates)
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Basic Science Tells Us that Adolescents’ Brains Are Still Developing…
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Copyright ©2004 by the National Academy of Sciences Gogtay, Giedd, et al. Proc. Natl. Acad. Sci., 2004 MRI Scans of Healthy Children and Teens Over Time
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When Reading Emotion… Adults Rely More on the Frontal Cortex While Teens Rely More on the Amygdala Deborah Yurgelon-Todd 2000.
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Do Adolescents React Differently than Adults to Substances of Abuse?
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Rats Exposed to Nicotine in Adolescence Self-Administer More Nicotine Than Rats First Exposed as Adults Collins et al, Neuropharmacology, 2004, Levin et al, Psychopharmacology, 2003
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Do We Need Fundamentally Different Strategies At Different Stages of Adolescence?
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Why do some people become addicted to drugs while others do not? Vulnerability
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high low High DA receptor Low DA receptor Individual Differences in Response to Drugs: DA Receptors influence drug liking As a group, subjects with low receptor levels found MP pleasant while those with high levels found MP unpleasant Adapted from Volkow et al., Am. J. Psychiatry, 1999.
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Genetics is a Big Contributor to the Risk of Addiction… And… The Nature of this Contribution Is Extremely Complex
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Gene Cluster is Associated with Nicotine Dependence
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What Other Biological Factors Contribute to Addiction--Comorbidity Prevalence of Drug Disorders Percent Prevalence of Nicotine Addiction
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COMORBIDITY
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Why do Mental Illnesses and Substance Abuse Co-occur? Self-medication substance abuse begins as a means to alleviate symptoms of mental illness Causal effects Substance abuse may increase vulnerability to mental illness Common or correlated causes the risk factors that give rise to mental illness and substance abuse may be related or overlap
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What Environmental Factors Contribute to Addiction? Stress Early physical or sexual abuse Witnessing violence Peers who use drugs Drug availability
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Becomes Subordinate Stress remains Becomes Dominant No longer stressed Individually Housed Group Housed Social Stressor Affects Brain DA D2 Receptors and Drug Self-Administration Morgan, D. et al., Nature Neuroscience, 2002.
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Prevention Works: Knowledge of Risk and Protective Factors Has Led to the Development of Effective Prevention Strategies
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Changes in Attitudes Lead to Changes in Use Monitoring the Future Study, 2007.
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Treatment Research (New Targets & New Strategies) Prevention Research (Children & Adolescents) genetics environment development co-morbidity HIV/AIDS Research Priority Areas for NIDA
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Adapted from Volkow et al., Neuropharmacology, 2004. Drive Saliency Memory Control Non-Addicted Brain NO GO Addicted Brain Drive Memory Control GO Saliency Why Can’t Addicts Just Quit? Because Addiction Changes Brain Circuits
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This is why treatment is essential. This is why addicts can’t just quit. and…
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Treating a Biobehavioral Disorder Must Go Beyond Just Fixing the Chemistry Pharmacological Treatments (Medications) We Need to Treat the Whole Person! In Social Context Behavioral Therapies Social Services Medical Services
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No single treatment is appropriate for all individuals. Treatment needs to be readily available. Treatment must attend to multiple needs of the individual, not just drug use. Multiple courses of treatment may be required for success. Remaining in treatment for an adequate period of time is critical for treatment effectiveness. Treatment Can Work! NIDA’s Principles of Treatment
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We Are Using Science to Develop Even Better Treatments Genetics Mechanisms Treatments
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CB1 Antagonists Inhibitors of metabolizing enzymes CRF Antagonists Medication Basic Research Agonist Therapy Methadone Buprenorphine Opiate agonists stabilize brain function in heroin addicts CB1 KO mice have decreased responses to multiple drugs of abuse Smokers who are poor nicotine metabolizers smoke less Stress triggers relapse in animal models of addiction and CRF antagonists interfere with the response to stress
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But, drug addiction is a chronic illness with relapse rates similar to those of hypertension, diabetes, and asthma. McLellan et al., JAMA, 2000.
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Relapse Rates Are Similar for Drug Addiction & Other Chronic Illnesses Type I Diabetes Drug Addiction 0 10 20 30 40 50 60 70 80 90 100 Hypertension Asthma 40 to 60% 30 to 50% 50 to 70% 50 to 70% Percent of Patients Who Relapse McLellan et al., JAMA, 2000.
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Addiction is Similar to Other Chronic Illnesses Because: It has biological and behavioral components, both of which must be addressed during treatment. Recovery from it--protracted abstinence and restored functioning--is often a long-term process requiring repeated episodes of treatment. Relapses can occur during or after treatment, and signal a need for treatment adjustment or reinstatement. Participation in support programs during and following treatment can be helpful in sustaining long-term recovery Therefore…
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Full recovery is a challenge but it is possible …
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Extended Abstinence is Predictive of Sustained Recovery It takes a year of abstinence before less than half relapse Dennis et al, Eval Rev, 2007 After 5 years – if you are sober, you probably will stay that way.
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DAT Recovery with prolonged abstinence from methamphetamine [C-11]d-threo-methylphenidate Volkow et al., J. Neuroscience, 2001. low high Normal Control Methamphetamine Abuser (1 month abstinent) Methamphetamine Abuser (14 months abstinent)
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Treatment Reduces Drug Use and Recidivism No treatment CREST Dropouts CREST Completers CREST Completers + Aftercare No treatment CREST Dropouts CREST Completers CREST Completers + Aftercare Delaware Work Release Therapeutic Community (CREST) + Aftercare 3 Years After Release (N=448) p < 0.05, compared to no treatment group Percentage of Participants
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We Need to Keep Our Eye on the Real Targets! Abstinence Functionality in Family, Work and Community In Treating Addiction…
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Treatment Research (New Targets & New Strategies) Prevention Research (Children & Adolescents) genetics environment development co-morbidity HIV/AIDS Research Priority Areas for NIDA
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Drug Use Has Played a Prominent Role in the HIV/AIDS Epidemic In Several Ways Disease Transmission - IV Drug Use—Needle sharing Drug Intoxication: Impaired judgment, disinhibition, leading to risky sexual behaviors Disease Progression Neurological Complications
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Proportions of AIDS Cases in Adults & Adolescents by Exposure in the USA Centers for Disease Control and Prevention (CDC) Men who have sex with men (MSM) Injection drug use MSM who inject drugs Year of Diagnosis % of Cases 70 60 50 40 30 20 10 0 1985 1987 1989 1991 1993 1995 1997 1999 2001 2003 Drugs of Abuse Have Had A Major Impact on the HIV/AIDS Epidemic Heterosexual contact
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Convergence of HIV Seroprevalence Among Injecting and Non-injecting Drug Users 0 5 10 15 20 Current Injectors Non-Injectors HIV Prevalence 13% CI 12-15% 12% CI 9-16% Drug Treatment Program (n=2121 2001-2004) Respondent-Driven Sampling (n=448 2004) 0 5 10 15 20 15% CI 11-19% 17% CI 12-21% Source: Des Jarlais et al AIDS, 21: 231-235, 2007. Current Injectors Non-Injectors
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White, not Hispanic Black, not Hispanic Hispanic Asian/Pacific Islander American Indian/ Alaska Native Year of Diagnosis % of Cases 70 60 50 40 30 20 10 0 Centers for Disease Control and Prevention (CDC) The AIDS Epidemic Disproportionately Affects Minority Populations 1985 1987 1989 1991 1993 1995 1997 1999 2001 2003 2005
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Acceleration of HIV Degeneration of Dopamine Cells With Cocaine
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International Research Collaboration NIDA International Program Components Post-Doctoral Research Fellowship Technical Consultation Scientific Exchange Information Dissemination
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Why focus on drug abuse internationally? Drug abuse is a global phenomenon 5 % of people aged 15-64 II. Intertwined dual-epidemics of drug addiction & HIV/AIDS HIV Infections Attributed to Injection Drug Use and Risky Sexual Behaviors Related to Drug Abuse UNODC 2005 World Drug Report III. Take advantage of unique opportunities to advance scientific knowledge through research
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NIDA Supports International Drug Abuse Research In Numerous Ways Fund international research Provide training and exchange opportunities Set international research priorities Organize & sponsor conferences and meetings Binational agreements Dissemination of information
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Where Do We Need to Go From Here? We Need to… Advance the SCIENCE Erase the STIGMA and… Erase the STIGMA and…
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For More Information NIDA Public Information: www.nida.nih.gov www.drugabuse.gov NIDA International Program: www.international.drugabuse.gov www.drugabuse.gov NIDA NATIONAL INSTITUTE ON DRUG ABUSE