Hormone–Receptor Binding
Hormone Receptors and Molecular Signaling
Hormone–Receptor Binding
Hormone–receptor binding is a reversible molecular interaction that allows a target cell to recognize a hormone. Shape, charge and chemical interactions contribute to binding, while receptor conformation links recognition with signaling.
Binding is not identical to activation
An agonist can stabilize an active receptor state. An antagonist may occupy a binding site without producing the same downstream response. Binding studies therefore answer a different question from functional response experiments.
What determines exposure
Free ligand concentration near the receptor, receptor abundance and binding kinetics influence complex formation. Local degradation, transport barriers and competing ligands can modify the situation compared with the concentration measured in peripheral blood.
Reading an experiment
Evidence that a hormone binds a receptor should be followed by evidence of an appropriate cellular response. Changes in binding affinity, signaling efficiency and maximum response must be distinguished when interpreting endocrine adaptation or dysfunction.
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