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Ismail S, Gherardi MJ, Froese A, Zanoun M, Gigoux V, Clerc P, Gaits-Iacovoni F, Steyaert J, Nikolaev VO, Fourmy D. Internalized Receptor for Glucose-dependent Insulinotropic Peptide stimulates adenylyl cyclase on early endosomes. Biochem Pharmacol 2016; 120:33-45. [PMID: 27641811 DOI: 10.1016/j.bcp.2016.09.009] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 09/12/2016] [Indexed: 12/25/2022]
Abstract
Until very recently, G-protein dependent signal of GPCRs was thought to originate exclusively from the plasma membrane and internalized GPCRs were considered silent. Here, we demonstrated that, once internalized and located in the membrane of early endosomes, glucose-dependent Insulinotropic receptor (GIPR) continues to trigger production of cAMP and PKA activation. Direct evidence is based on identification of the active form of Gαs in early endosomes containing GIPR using a genetically encoded GFP tagged nanobody, and on detection of a distinct FRET signal accounting for cAMP production at the surface of endosomes containing GIP, compared to endosomes without GIP. Furthermore, decrease of the sustained phase of cAMP production and PKA activation kinetics as well as reversibility of cAMP production and PKA activity following GIP washout in cells treated with a pharmacological inhibitor of GIPR internalization, and continuous increase of cAMP level over time in the presence of dominant-negative Rab7, which causes accumulation of early endosomes in cells, were noticed. Hence the GIPR joins the few GPCRs which signal through G-proteins both at plasma membrane and on endosomes.
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Affiliation(s)
- Sadek Ismail
- Laboratoire de Physique et Chimie des Nano-objets (LPCNO), team RTTC, Université de Toulouse, CNRS, INSA, INSERM, Université Paul Sabatier, Toulouse, France
| | - Marie-Julie Gherardi
- Laboratoire de Physique et Chimie des Nano-objets (LPCNO), team RTTC, Université de Toulouse, CNRS, INSA, INSERM, Université Paul Sabatier, Toulouse, France
| | - Alexander Froese
- German Center for Cardiovascular Research, University Medical Center Hamburg-Eppendorf and Institute of Experimental Cardiovascular Research, Hamburg, Germany
| | - Madjid Zanoun
- Cellular Imaging Facility Rangueil, INSERM U1048/I2MC, Toulouse, France
| | - Véronique Gigoux
- Laboratoire de Physique et Chimie des Nano-objets (LPCNO), team RTTC, Université de Toulouse, CNRS, INSA, INSERM, Université Paul Sabatier, Toulouse, France
| | - Pascal Clerc
- Laboratoire de Physique et Chimie des Nano-objets (LPCNO), team RTTC, Université de Toulouse, CNRS, INSA, INSERM, Université Paul Sabatier, Toulouse, France
| | - Frederique Gaits-Iacovoni
- INSERM, UMR1048, University of Toulouse 3, Institute of metabolic and cardiovascular diseases, Toulouse, France
| | - Jan Steyaert
- Structural Biology Brussels, Vrije Universiteit Brussel, Brussel, Belgium; Structural Biology Research Center, VIB, Brussel, Belgium
| | - Viacheslav O Nikolaev
- German Center for Cardiovascular Research, University Medical Center Hamburg-Eppendorf and Institute of Experimental Cardiovascular Research, Hamburg, Germany
| | - Daniel Fourmy
- Laboratoire de Physique et Chimie des Nano-objets (LPCNO), team RTTC, Université de Toulouse, CNRS, INSA, INSERM, Université Paul Sabatier, Toulouse, France.
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Felouzis V, Hermand P, de Laissardière GT, Combadière C, Deterre P. Comprehensive analysis of chemokine-induced cAMP-inhibitory responses using a real-time luminescent biosensor. Cell Signal 2015; 28:120-9. [PMID: 26515128 DOI: 10.1016/j.cellsig.2015.10.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Accepted: 10/23/2015] [Indexed: 01/29/2023]
Abstract
Chemokine receptors are members of the G-protein-coupled receptor (GPCR) family coupled to members of the Gi class, whose primary function is to inhibit the cellular adenylate cyclase. We used a cAMP-related and PKA-based luminescent biosensor (GloSensor™ F-22) to monitor the real-time downstream response of chemokine receptors, especially CX3CR1 and CXCR4, after activation with their cognate ligands CX3CL1 and CXCL12. We found that the amplitudes and kinetic profiles of the chemokine responses were conserved in various cell types and were independent of the nature and concentration of the molecules used for cAMP prestimulation, including either the adenylate cyclase activator forskolin or ligands mediating Gs-mediated responses like prostaglandin E2 or beta-adrenergic agonist. We conclude that the cAMP chemokine response is robustly conserved in various inflammatory conditions. Moreover, the cAMP-related luminescent biosensor appears as a valuable tool to analyze the details of Gi-mediated cAMP-inhibitory cellular responses, even in native conditions and could help to decipher their precise role in cell function.
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Affiliation(s)
- Virginia Felouzis
- Sorbonne Universités, UPMC Université Paris 06, Inserm U 1135, CNRS ERL 8255, Centre d'Immunologie et des Maladies Infectieuses, 91 Boulevard de l'Hôpital, F-75013 Paris, France
| | - Patricia Hermand
- Sorbonne Universités, UPMC Université Paris 06, Inserm U 1135, CNRS ERL 8255, Centre d'Immunologie et des Maladies Infectieuses, 91 Boulevard de l'Hôpital, F-75013 Paris, France
| | - Guy Trambly de Laissardière
- Université de Cergy-Pontoise, CNRS, UMR 8089, Laboratoire de Physique Théorique et Modélisation, 2 Avenue A. Chauvin, F-95302 Cergy-Pontoise, France
| | - Christophe Combadière
- Sorbonne Universités, UPMC Université Paris 06, Inserm U 1135, CNRS ERL 8255, Centre d'Immunologie et des Maladies Infectieuses, 91 Boulevard de l'Hôpital, F-75013 Paris, France
| | - Philippe Deterre
- Sorbonne Universités, UPMC Université Paris 06, Inserm U 1135, CNRS ERL 8255, Centre d'Immunologie et des Maladies Infectieuses, 91 Boulevard de l'Hôpital, F-75013 Paris, France.
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