期刊
出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2025846118
关键词
GPCR; endosomal signaling; Gq; 11; arrestin
资金
- Swedish Society for Medical Research [P18-0098]
- FAPESP [2016/24120-3]
- Vanier Canada Graduate Scholarship from the Canadian Institutes of Health Research (CIHR)
- NIH [GM130142]
- CIHR [FDN-148431]
- Canada Research Chair in Signal Transduction and Molecular Pharmacology
This study uses bioluminescence resonance energy transfer (BRET) to investigate the translocation and activity of Gq in endosomes, revealing different mechanisms underlying Gq activity at the plasma membrane and endosomes.
G protein-coupled receptors (GPCRs) are gatekeepers of cellular homeostasis and the targets of a large proportion of drugs. In addition to their signaling activity at the plasma membrane, it has been proposed that their actions may result from translocation and activation of G proteins at endomembranes-namely endosomes. This could have a significant impact on our understanding of how signals from GPCR-targeting drugs are propagated within the cell. However, little is known about the mechanisms that drive G protein movement and activation in subcellular compartments. Using bioluminescence resonance energy transfer (BRET)-based effector membrane translocation assays, we dissected the mechanisms underlying endosomal Gq trafficking and activity following activation of Gq-coupled receptors, including the angiotensin II type 1, bradykinin B2, oxytocin, thromboxane A2 alpha isoform, and muscarinic acetylcholine M3 receptors. Our data reveal that GPCR-promoted activation of Gq at the plasma membrane induces its translocation to endosomes independently of beta-arrestin engagement and receptor endocytosis. In contrast, Gq activity at endosomes was found to rely on both receptor endocytosisdependent and -independent mechanisms. In addition to shedding light on the molecular processes controlling subcellular Gq signaling, our study provides a set of tools that will be generally applicable to the study of G protein translocation and activation at endosomes and other subcellular organelles, as well as the contribution of signal propagation to drug action.
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