How Physiologic Targets Can Be Distinguished from Drug-Binding Proteins

Area of Science:

• Pharmacology
• Molecular Biology
• Drug Discovery

Background:

• Clinical trials reveal drugs can be effective due to off-target activity.
• Current methods for identifying drug targets may be incomplete, missing crucial off-target interactions.
• Understanding the full molecular basis of drug action requires identifying all relevant targets.

Purpose of the Study:

• To outline a multidisciplinary, cell-based strategy for the systematic identification of drug physiologic targets.
• To define a physiologic target as a drug-binding protein whose genetic disruption mimics drug effects.
• To emphasize the importance of verifying drug specificity early in development.

Main Methods:

• A multidisciplinary, cell-based approach is proposed.
• Physiologic targets are identified by comparing drug treatment effects with genetic disruption effects.
• Experimental verification of drug-protein interactions in cells is crucial.

Main Results:

• A significant portion of drug-binding proteins may not be responsible for the observed pharmacological effects.
• The proposed strategy allows for the systematic identification of true physiologic targets.
• Early identification of off-target proteins can improve drug development.

Conclusions:

• Many drug target identification studies are incomplete.
• A systematic, cell-based approach is valuable for identifying drug physiologic targets.
• This strategy is applicable to drugs developed using target-based strategies.