TY - JOUR
T1 - Spatiotemporal GLP-1 and GIP receptor signaling and trafficking/recycling dynamics induced by selected receptor mono- and dual-agonists
AU - Novikoff, Aaron
AU - O'Brien, Shannon L
AU - Bernecker, Miriam
AU - Grandl, Gerald
AU - Kleinert, Maximilian
AU - Knerr, Patrick J
AU - Stemmer, Kerstin
AU - Klingenspor, Martin
AU - Zeigerer, Anja
AU - DiMarchi, Richard
AU - Tschöp, Matthias H
AU - Finan, Brian
AU - Calebiro, Davide
AU - Müller, Timo D
N1 - (Ekstern)
PY - 2021
Y1 - 2021
N2 - Objective: We assessed the spatiotemporal GLP-1 and GIP receptor signaling, trafficking, and recycling dynamics of GIPR mono-agonists, GLP-1R mono-agonists including semaglutide, and GLP-1/GIP dual-agonists MAR709 and tirzepatide. Methods: Receptor G protein recruitment and internalization /trafficking dynamics were assessed using bioluminescence resonance energy transfer (BRET)-based technology and live-cell HILO microscopy. Results: Relative to native and acylated GLP-1 agonists, MAR709 and tirzepatide showed preserved maximal cAMP production despite partial Gαs recruitment paralleled by diminished ligand-induced receptor internalization at both target receptors. Despite MAR709's lower internalization rate, GLP-1R co-localization with Rab11-associated recycling endosomes was not different between MAR709 and GLP-1R specific mono-agonists. Conclusions: Our data indicated that MAR709 and tirzepatide induce unique spatiotemporal GLP-1 and GIP receptor signaling, trafficking, and recycling dynamics relative to native peptides, semaglutide, and matched mono-agonist controls. These findings support the hypothesis that the structure of GLP-1/GIP dual-agonists confer a biased agonism that, in addition to its influence on intracellular signaling, uniquely modulates receptor trafficking.
AB - Objective: We assessed the spatiotemporal GLP-1 and GIP receptor signaling, trafficking, and recycling dynamics of GIPR mono-agonists, GLP-1R mono-agonists including semaglutide, and GLP-1/GIP dual-agonists MAR709 and tirzepatide. Methods: Receptor G protein recruitment and internalization /trafficking dynamics were assessed using bioluminescence resonance energy transfer (BRET)-based technology and live-cell HILO microscopy. Results: Relative to native and acylated GLP-1 agonists, MAR709 and tirzepatide showed preserved maximal cAMP production despite partial Gαs recruitment paralleled by diminished ligand-induced receptor internalization at both target receptors. Despite MAR709's lower internalization rate, GLP-1R co-localization with Rab11-associated recycling endosomes was not different between MAR709 and GLP-1R specific mono-agonists. Conclusions: Our data indicated that MAR709 and tirzepatide induce unique spatiotemporal GLP-1 and GIP receptor signaling, trafficking, and recycling dynamics relative to native peptides, semaglutide, and matched mono-agonist controls. These findings support the hypothesis that the structure of GLP-1/GIP dual-agonists confer a biased agonism that, in addition to its influence on intracellular signaling, uniquely modulates receptor trafficking.
KW - Biased agonism
KW - Dual-agonists
KW - GIPR
KW - GLP-1R
KW - Receptor internalization
KW - Receptor trafficking
UR - http://www.scopus.com/inward/record.url?scp=85101615958&partnerID=8YFLogxK
U2 - 10.1016/j.molmet.2021.101181
DO - 10.1016/j.molmet.2021.101181
M3 - Journal article
C2 - 33556643
AN - SCOPUS:85101615958
SN - 2212-8778
VL - 49
JO - Molecular Metabolism
JF - Molecular Metabolism
M1 - 101181
ER -