Genomic Medicine Flashcards
What are the goals of pharmacology
The ability to administer the right kind of drug in the right patient at the right amount
Explain pharmacokinetics and pharmacodynamics
Kinetics is what we do to the drug, rate of absorption of the drug and the rate at which it gets to the site of action,
Dynamics is what the drug does to us, its effects and side effects both
What must be true for an effective drug, 4 things
- Has to reach its site of action
- Has to be in active form
- Has to be in sufficient concentration
- Has to stay there for sufficient time
All of these concepts lie under the concept of pharmacokinetics
How does the pharmacokinetics and pharmacodynamics interact in terms of administering the drug, there are 4
ADME Absorption Distribution within the body Metabolism Excretion
What enzyme metabolizes most of the drugs
CYP450, it is a family of enzymes
Where are they found
In the liver, primarily
Differentiate between pharamcogenetics and pharmacogenomics
Pharmacogenomics is searching the entire genome to identify target genes that can be potentially be used for site of action for a drug and help us in developing more drugs
Pharmacogenetics is the genetic heritability that an individual has that determines how that individual responds to a drug
What is debrisoquine
Anti hypertensive
What enzyme metabolizes debrizoquine
CYP2D6
What are the classes of people that have different functional polymorphism that codes for this enzyme
Extensive metabolizers are those people that fall in the middle and are classified as normal metabolizers of debrizoquine
Poor metabolizers have lower functioning CYP2D6 and then we have ultra rapid metabolizers that have high functioning CYP2D6
How does the mutations affect this enzyme
Most mutations causes loss of function. Gene duplication, having more genes for this enzyme causes people to become ultra fast metabolizers
Does environmental factors affect drug metabolism
Yes
What example did he give us regarding this
Usually when you administer a drug you see a peak concentration of it in the blood in about an hour. However people with charcoal broiled beef diet can have increase in the transcription of the CYP450 drugs that increase their metabolism power by 50 or 100 folds so the max concentration seen in the blood after an hour decreases.
Charcoal broiled beef diet has transcription factors that directly go in to the liver and increases transcription of CYP450, or somehow they cause an increase in transcription and translation of these enzymes
What is this process called
Induction
What does induction do for the therapeutic concentration
We need higher doses of the drugs