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A three-state receptor model of agonist action
P Leff1, C Scaramellini, C Law
1Astra Charnwood, Loughborough, UK.
Trends in Pharmacological Sciences
|November 14, 1997
Summary
Receptor theory is evolving, proposing a three-state model with two active conformations. This model explains variable agonist and inverse agonist behaviors in receptors coupled to different pathways.
Area of Science:
- Pharmacology
- Biochemistry
- Molecular Biology
Background:
- Receptors can exist in multiple conformational states.
- Understanding the number of active states is crucial for explaining pharmacological observations.
- Receptor pharmacology can vary when coupled to different effector pathways.
Purpose of the Study:
- To propose and develop a three-state receptor model.
- To investigate the implications of multiple active receptor states.
- To account for variable agonist and inverse agonist behavior.
Main Methods:
- Development of a theoretical three-state receptor model.
- Analysis of agonist and inverse agonist behavior.
- Application of the model to promiscuously coupled receptors.
Main Results:
- A three-state receptor model with two active conformations was developed.
- The model predicts variable agonist and inverse agonist behavior.
- The model accounts for data from promiscuously coupled receptors.
Conclusions:
- The proposed model challenges traditional receptor theory.
- The model provides a basis for understanding complex receptor pharmacology.
- General principles of receptor classification are largely preserved.