Peptides MEX / Glossary
Antagonist: response blockade and assay context
Antagonist describes a functional relationship in a defined system rather than a general judgment about a molecule.
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What is being opposed
An antagonist reduces or blocks an agonist-induced response. In receptor pharmacology, an agonist activates a response and an antagonist can prevent that activation. The label needs a receptor or mechanism and a measured outcome.
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Interpreting a reported finding
If a paper reports antagonism of a cellular signal, identify the agonist used and the signal reduced. That finding does not show that every receptor function disappears or that a clinical benefit follows.
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Questions about this reference
Does an antagonist always produce the opposite effect?
No. Blocking an agonist response does not necessarily mean producing an opposite response on its own.
Sources and original reading
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