Receptor Agonist
Also known as: agonist
A molecule that binds to a receptor and triggers the same biological response as the endogenous ligand.
An agonist is a 'key' that fits the receptor lock and turns it on. Full agonists produce the maximum possible response; partial agonists produce a submaximal response even at receptor saturation. Most therapeutic peptides are full agonists engineered to be more potent, longer-lasting, or more selective than the natural hormone they mimic.
The distinction between full and partial agonism matters for side-effect profile. A partial agonist can actually blunt response at high endogenous hormone levels — which is sometimes a feature, not a bug, when the researcher wants floor effects without ceiling effects.
Related Terms
Receptor Antagonist
A molecule that binds to a receptor without activating it, preventing the endogenous ligand from triggering a response.
GLP-1 Receptor
A G-protein coupled receptor activated by glucagon-like peptide-1, expressed primarily in pancreatic beta cells, the central nervous system, and gastrointestinal tract.
GIP Receptor
A G-protein coupled receptor activated by glucose-dependent insulinotropic polypeptide, expressed in adipose tissue, pancreatic beta cells, and brain.
GLP-1 Agonist
A class of peptides that activates the GLP-1 receptor, researched for effects on glucose regulation, gastric motility, and appetite signaling.
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