Determining the Effects of Differential Expression of GRKs and β-arrestins on CLR-RAMP Agonist Bias

Abstract

Signalling of the calcitonin-like receptor (CLR) is multifaceted, due to its interaction with receptor activity modifying proteins (RAMPs), and three endogenous peptide agonists. Previous studies have focused on the bias of G protein signalling mediated by the receptor and receptor internalisation of the CLR-RAMP complex has been assumed to follow the same pattern as other Class B1 G Protein-Coupled Receptors (GPCRs). Here we sought to measure desensitisation of the three CLR-RAMP complexes in response to the three peptide agonists, through the measurement of β-arrestin recruitment and internalisation. We then delved further into the mechanism of desensitisation through modulation of β-arrestin activity and the expression of GPCR kinases (GRKs), a key component of homologous GPCR desensitisation. First, we have shown that CLR-RAMP1 is capable of potently recruiting β-arrestin1 and 2, subsequently undergoing rapid endocytosis, and that CLR-RAMP2 and -RAMP3 also utilise these pathways, although to a lesser extent. Following this we have shown that agonist-dependent internalisation of CLR is β-arrestin dependent, but not required for full agonism. Overexpression of GRK2-6 was then found to decrease receptor signalling, due to an agonist-independent reduction in surface expression of the CLR-RAMP complex. These results represent the first systematic analysis of the importance of β-arrestins and GRKs in CLR-RAMP signal transduction and pave the way for further investigation regarding other Class B1 GPCRs.

Divisions: College of Health & Life Sciences > Aston Pharmacy School
Additional Information: © 2022 Pearce, Redfern-Nichols, Harris, Poyner, Wigglesworth and Ladds. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. This work was supported by two UK Biotechnology and Biological Sciences Research Council (BBSRC)-iCase studentships (AP: BB/JO14540/1; TR-N: BB/V509334/1), both co-funded with AstraZeneca.
Uncontrolled Keywords: Physiology,GPCRs (G protein-coupled receptors),signalling bias,CLR,β-arrestins,RAMPs,internalisation,GRK (G protein receptor kinase)
Publication ISSN: 1664-042X
Last Modified: 11 Jul 2024 07:08
Date Deposited: 13 Apr 2022 15:40
Full Text Link:
Related URLs: https://www.fro ... 022.840763/full (Publisher URL)
PURE Output Type: Article
Published Date: 2022-03-29
Accepted Date: 2022-03-08
Submitted Date: 2021-12-21
Authors: Pearce, Abigail
Redfern-Nichols, Theo
Harris, Matthew
Poyner, David R. (ORCID Profile 0000-0003-1590-112X)
Wigglesworth, Mark
Ladds, Graham

Download

[img]

Version: Published Version

License: Creative Commons Attribution

| Preview

[img]

Version: Published Version

License: Creative Commons Attribution

| Preview

Export / Share Citation


Statistics

Additional statistics for this record