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Lecture 1 from a college level neuropharmacology course taught in the spring 2012 semester by Brian J. Piper, Ph.D. ([email protected]) at Willamette University. Covers writing a research paper, routes of administration, writing a research paper, animal research ethics, neurochemistry.
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Neuropharmacology & Behavior:
IntroductionBrian J. Piper, [email protected]
Hit F5 to view show (for PCs).
Goals
• Course Overview
• Research resources
• Animal Research
• Pharmacokinetics
1. Course Objectives
• Drugs: legal and illicit, recreational and “everyday”
• Psychobiology: Brain + Behavior relationships can be studied using drugs as tools
• Homework: NPR
• Written communication– Primary sources: Studies– Secondary sources: Reviews– Tertiary sources:
• Newsweek
• Online organizations where author’s name is NOT known (e.g. NIDA, Erowid)
• Newspaper
• Wikipedia
Writing your Research Paper
Essay Research Paper
Sources Tertiary Primary, some secondary
Tone Informal, personal opinion,
Uses “I”Formal
Quotes Yes Few (1-2/paper)
Abstract No Yes
End Bibliography References, APA format
2. Literature Search
• Wikipedia (preliminary only, variable quality)
• Google (heavy on $)
• Pubmed (Backward Search)
• Psych Info (Backward Search)
• Specialized databases (Backward Search)
• Google Scholar (Forward Search)
• Also: Direct contact
Pubmed
• Developed by National Library of Medicine (NIH)
• http://www.ncbi.nlm.nih.gov/pubmed
Pubmed
Keywords are Important
Free is For Me!
Google Scholar
Specialized Databases
• Manage to bypass copyright law (how?)
• Example: Psychedelic Bibliography
• http://www.maps.org/sys/w3pb.pl?face=simple/
All Journals Aren’t Created Equal
Great! Not Great!Science (30.1) Psychological Reports (0.3)
Nature (29.8) Neuroreport (1.9)
New England J Medicine (53.5) J of Psychoactive Drugs (1.3)
Am J Public Health (4.2) Life Science (2.5)
J Amer Med Association (30.0)
Proceed Nat Acad Science (4.8)
Psychopharmacology (3.8)
Neuropharmacology (3.9)
Neuropsychopharmacology (6.7 ) International J of …. , SW Missouri Newsletter
Impact Factor: # citations per manuscript per year
Ethics of Animal Use in Research and Teaching
Rules and Regulations
The primary responsibility when working with animals is to treat them humanely.
Questionable Animal Research 1: Foot shock induced
aggression• Mild footshock to paired rats results in
fighting
• Used to study effects of hormones, temperature, drugs
• Justified?
Questionable Animal Research 2: Parabiosis
• Surgical means to create conjoined twins
• Used for behavioral endocrinology
Questionable Animal Research 3: Harry Harlow & monkey love
• Tested food versus contact comfort• Important for adopted children• Animal rights movement is a reaction to his
research
1905-1981
1.5 min: http://www.youtube.com/watch?v=fg9QCeA4FJs
AWAAnimal Welfare Act
• 1966, amended in most recently in 2007• Regulates use of dogs, cats, hamsters, guinea pigs,
rabbits, farm animals, marine mammals, and non-human primates in research and teaching (rats, mice, and birds are currently not regulated, but probably will be in the near future).
• The regulations cover the procurement, handling, treatment, and transportation of these animals.
rabb
its
Oth
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arm
ani
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s
ham
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pigs
dogs
prim
ates
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cats
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AWA enforcement
• Enforced by the Animal and Plant Health Inspection Service of the United States Department of Agriculture (USDA) – Unannounced annual on-site inspections– Inspects all facilities, relevant records, and
documentation– Progressive series of disciplinary actions for
non-compliance, including citations, warning, fines, court orders, loss of registration
IACUCInstitutional Animal Care and Use Committee
• Reviews animal use proposals
• Conducts semi-annual inspections of animal facilities
• Investigates concerns about animal care and use
• Can suspend research or teaching activities when a major violation has occurred
IACUC membership
• A veterinarian who is certified in laboratory animal medicine.
• At least one practicing scientist who is experienced with research and training involving animals.
• A least one member of the public to represent general community interests in the proper care and use of animals.
Role of IACUC
• To protect animal welfare.
• To protect the University.
• To assist in maintenance of a productive research environment.
• To utilize peer review in evaluation of protocols and inspection of animal facilities.
Animal Care and Use Protocols
• Rationale and purpose of the proposed use of animals.
• Justification of the need to use animals, the species of animal chosen and the number of animals requested.
• Adequacy of training and experience of personnel.
• Housing and care of animals.• Pain and distress• Method of disposition of the animals
at the end of the study.
Justification and Use of Animals
The Three R’s• Legislated by the AWA• Replacement
– Substitution of other models for animals (or substitution of a less sentient species for a more sentient one)
• Can the hypothesis be tested or the training be done with cell cultures, computer simulations, or other non-animal system?
• Reduction– What is the minimum number of animals that can still yield
statistically valid outcomes?• Can you work with a statistician to determine this?
• Refinement– What efforts are being made to eliminate or minimize animal
pain and distress?• Anesthesia, analgesia and alternate experimental design must be considered.
Societal Decision (Pros)
Benefits to Humans• Vaccines• Antibiotics• Medical procedures• Space travel
• Benefits to Animals
Hair Analysis
• Some rhesus monkeys exhibit self-abusive behavior (SIB)
• Cortisol, a stress hormone, levels were examined in monkeys
Davenport et al. (2008). Biological Psychiatry, 63, 990-996.
Societal Decision (Cons)
• Similarity to Humans – Chemistry– Anatomy– Pain?
• Association for the Assessment and Accreditation of Laboratory Animal Care – This is a volunteer organization that works with research
organizations to ensure the highest standards of animal care and use.
– They emphasize appropriate veterinary care, in-depth oversight by IACUC, protection of the health of animals.
– Full accreditation by AAALAC considered one of the best professional achievements in the field of lab animal care
Non-government Organizations• AALAS
– American Assoc. for Lab Animal Science
• AAALAC– Association for the Assessment and
Accreditation of Laboratory Animal Care
• ASLAP– American Society of Lab Animal
Practitioners• ACLAM
– American College of Lab Animal Medicine
• SCAW– Scientists Center for Animal Welfare
• PRIMR– Public Responsibility In Medicine and
Research
• NABR– National Assoc for Biomedical
Research• FBR
– Foundation for Biomedical Research
• ILAR– Institute of Lab Animal Resources
• AWIC– Animal Welfare Info Center
• ARENA– Applied Research Ethics National
Association• CAAT
– Center for Alternatives to Animal Testing
The Guide for the Care and Use of Laboratory Animals
• Describes institutional responsibilities for animal care and use
• Provides guidelines for designing and operating an animal care program
Interim Summary
• AWA (R-R-R)
4. Content!!
• Introduction
• Routes of drug administration
• Dose-Response Models
• Sensitization & Tolerance
• Drug Laws
How (many) drugs work: neurotransmission.
a.p. = action potential
Types of Different Drugs
• Drug = any chemical put into the body that changes mental state or bodily function (Kuhn, 2003)
Group Example Mechanism
Xanthines Caffeine, theophylline, Theobromine
Blocks adenosine
Entactogens MDMA, MDA Serotonin
Hullucinogens LSD, mushrooms Varied
Opiates Heroin, morphine, codeine, oxycodone
Endorphins
Stimulants Amphetamine,
cocaine
Dopamine
Group Examples Mechanism
Herbal Drugs Ginko, St. John’s wort
Varied
Sedatives Valium, GHB GABA
Steroids Testosterone,
androstenedione
Testosterone
Inhalants Gasoline, paints Varied
Nicotine Cigarettes, chewing tobacco
Acetylcholine
Routes of administration (ROA)
• Oral (p.o.): caffeine, alcohol• Inhaled: THC• Injected (hypodermic syringe: Alexander Wood-1853)
– Intravenously (i.v.): heroin– Subcutaneous (s.c.): occasionally heroin – Intramuscularly (i.m.): steroids
• Topical: nicotine patch• Sublingual: LSD• Other: intrathecal, rectal, vaginal, eye
ROA Determines Blood Levels• Different routes of
administration produce different levels of drug in the blood
• In general:
– Injection: quick, drug levels peak soon and come down rapidly (green)
– Inhalation: also very quick (red)
– Oral: absorbed and eliminated more slowly (blue)
3.1
ROA Example: Cocaine
Compare: time to reach maximum concentration (min)Vs.maximumconcentration(ng/ml)
Unit Label #
centi hundredth 10e-2
miili thousandth 10e-3
micro millionth 10e-6
nano billionth 10e-9
Half-Life
• Half-life: the amount of time that 50% of drug is eliminated
• Example: Caffeine has a half-life of 3 hours– In 3 hours, 50% of caffeine is removed
– In 6 hours, 75% is removed (half of remaining 50%) – In 9 hours, 87.5% is removed– In 12 hours, 93.75% is removed, and so on
• Drug elimination depends on the biological matrix– Drugs are eliminated most quickly from the blood but may be
detected at longer intervals in urine, feces, sweat, saliva, or hair.
Dose Response Models
• Threshold Model: This is the standard model in pharmacology. Increasing the dose beyond a certain point will produce a linear response.
• Caffeine example: Increasing the dose of caffeine will cause an increase response (e.g. heart rate).
Threshold Model
0
1
2
3
4
5
6
7
8
1 2 3 4 5 6
Dose
Re
spo
nse
a
2.5
a= NOEL
Hormesis Model
• Hormesis: the relationship between dose and response shows a non-linear or “J” shaped function, low doses produce the opposite effects of high doses.
• Alcohol Example: High doses of alcohol cause sedation and reduce motor activity. However, low doses increase activity.
Hormesis Model
0
24
6
8
1012
14
1 2 3 4 5 6
Dose
Resp
onse
Edward Calabrese
Tolerance/Sensitization
• The response to a drug can change with repeated administration.– Sensitization: a heightened response– Tolerance: a reduced response
Example of tolerance
• Rats received ecstasy (MDMA) on 6 days. Arrows indicate times of administration.
• Panel A shows that MDMA effected core temperature on the 1st day.
• Panel B shows that the same dose had less effects on the 3th day.
• Panel C shows almost no effects by the 6th day.
Piper et al. (2005) Developmental Psychobiology, 47, 145-157.
Mechanisms of Tolerance
• Tolerance can result from one of more factors– Pharmacokinetic Tolerance: pharmacokinetics is the
study of drug metabolism, tolerance could be caused by the drug being eliminated from the blood more quickly
– Pharmacodynamic Tolerance: pharmacodynamics is the study of how drugs act a cellular level, there could be a reduced response by neurons
– Psychological Tolerance: classical conditioning processes
Schedule of Drugs
• U.S. federal government developed a system to classify drugs, Comprehensive Drug Abuse Prevention and Control Act of 1970 describes different schedules (I to V)
• Scheduling is based on:– Medically approved use: Is there a disease that the drug is effective in
treating?
– Abuse Potential: What is the likelihood that the drug will be abused?
Schedule Medically
Approved Use
Abuse Potential Examples
I No High marijuana,
heroin, LSD
II Limited High cocaine, amphetamine
III Yes Moderate Steroids, Ketamine,
Marinol
IV Yes Moderate chance of physical dependence
Valium, Ambien
V Yes Low chance of physical dependence
Codeine
For more details, goto: http://en.wikipedia.org/wiki/DEA_Schedule_1
What’s in a name?Chemical Brand Street
Fluoxetine hydrochoride Prozac happy pills
Methylphenidate Ritalin Vitamin R
Oxycodone Oxycontin Oxy, Hillbilly Heroin
Clonazepam Klonopin K-pin
Summary
• Hormesis vs. Threshold
• Tolerance vs. Sensitization
• ROA on PK
• Schedules