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The document discusses drug discovery including defining drug targets, generating diversity for screening, defining lead structures, and qualifying leads for transition to early trials. It also discusses why compounds fail in development such as toxicity, lack of efficacy, market reasons, and poor biopharmaceutical properties. Additionally, it contrasts empirical and rational drug discovery philosophies and discusses generating diversity through natural products and targeted libraries.

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Jonille Echevarria
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33 views4 pages

Webinar 1

The document discusses drug discovery including defining drug targets, generating diversity for screening, defining lead structures, and qualifying leads for transition to early trials. It also discusses why compounds fail in development such as toxicity, lack of efficacy, market reasons, and poor biopharmaceutical properties. Additionally, it contrasts empirical and rational drug discovery philosophies and discusses generating diversity through natural products and targeted libraries.

Uploaded by

Jonille Echevarria
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Drug Discovery – Module 6, Session 1

OUTLINE

General Introduction
o Definition of Drug Targets
o Generating Diversity for screening
o Definition of Lead Structures
o Qualifying Lead for Transition to early Trials

Drug Discovery: A Succession of Styles

Antiquity to 1960s Mixture of natural products vs. bioassay


1930s to present Pure compounds vs. bioassays
1960s to present Pure compounds vs. pure enzymes
1980s to present Combinational methods to bring mixtures of
compounds

Why compounds fail or slowdown in development?


 Toxicity, 22%
- Ambiguity in toxicology studies
 Lack of efficacy, 31%
- Low potency/ selectivity
 Market reasons, 6%
-Synthetic complexity
-Time-sensitivity of indication
-Competing products
 Poor biopharmaceutical properties, 41%

Two contrasting Drug Discovery “Philosophies”

 “EMPIRICAL” Recognize initial drug lead by functionally useful effect E.g. penicillin (anti-bacterial
effect)
 “RATIONAL” Recognize drug by design or screen against drug target’s function E.g. HIV-protease
inhibitor (anti-infection), metoprolol (anti-hypertensive)
Generating Diversity for screening
Source of diversity

 “Natural Products” – entities derived from plants, animals, bacteria, etc. may have
“ethnopharmacognosy” to suggest use.
-“pure compound” collections
-extracts: aqueous/organic
-genetically altered producer organisms

 Target non-selected chemical compound libraries


-peptide/protein
-non-peptide

 Target-directed chemical compound libraries


-“classical” medicinal chemistry/ bona fide cystal structure- derived
-“docked” lead structures into model
ONCE YOU HAVE A TARGET AND CADIDATE DRUG MOLECULES: HOW TO DESIGN A
DRUG SCREEN?
• Biochemical "Pure target" Screen (binding, functional):
Advantage: "Pure" Structural / Functional Outcomes
Disadvantage: Out of cellular / biochemical context
• Cell-Based
Advantage: Readout in a "living" system;
Disadvantage: Must deconvolute mechanism

STEPS IN CANCER DRUG DISCOVERY & DEVELOPMENT


• Define drug target or define an "active" drug
• Optimize evidence of activity in animal models of cancer (dose / schedule)
• Relate activity (or lack thereof) in animal models to concentrations and durations of drug exposure
• Define in animals a safe starting dose for human clinical trials
• This information assembled into an "investigational new drug" ("IND") application to the FDA
FDA PRECLINICAL PHARMACOLOGY & TOXICOLOGY REQUIREMENTS
• DRUGS – Two Species - Rodent & Non-rodent – Clinical Route & Schedule
-- Follow NCI Guidelines – Pharmacokinetics - Optional
• BIOLOGICALS – Most Relevant Species – Clinical Route & Schedule

PRECLINICAL DRUG STUDIES: SUMMARY


• Aid and promote clinical trials design
• Assure likely safety of initially explored regimen
• Provide scientific basis for assessing clinical effects of agent
• Increasingly to focus on correlating molecular effects of agents on intended targets along with “usual”
pharmacologic / toxicologic endpoints.

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