Effects of Monoclonal Antagonist Antibodies on Calcitonin Gene-related Peptide Receptor Function and Trafficking
Overview
Affiliations
Background: Monoclonal antibodies against calcitonin gene-related peptide (CGRP) or its receptor are efficacious for the prevention of migraine headaches. The downstream molecular mechanisms following ligand-receptor blockade by which these antibodies prevent CGRP signaling through CGRP receptors have not been demonstrated.
Methods: Here we produced tool monoclonal functional antagonist antibodies against CGRP and its canonical receptor and developed a novel cellular model using fluorogen-activated protein technology that allows detection of CGRP receptor internalization by flow cytometry and, for an extended time course, visualization by confocal microscopy.
Results: Using this cell model we showed that these antagonist antibodies block both CGRP-induced cAMP signaling and CGRP receptor internalization. At least 10-fold higher concentrations of either antibody are necessary to block CGRP receptor internalization compared with cAMP accumulation in our cell model.
Conclusion: These data reinforce our understanding of how monoclonal functional antagonist antibodies interfere with CGRP signaling.
Mode and site of action of therapies targeting CGRP signaling.
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