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Bodin S, Previti S, Jestin E, Vimont D, Ait-Arsa I, Lamare F, Rémond E, Hindié E, Cavelier F, Morgat C. Design, Synthesis, and Biological Evaluation of the First Radio-Metalated Neurotensin Analogue Targeting Neurotensin Receptor 2. ACS OMEGA 2023; 8:6994-7004. [PMID: 36844603 PMCID: PMC9948202 DOI: 10.1021/acsomega.2c07814] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 01/30/2023] [Indexed: 05/28/2023]
Abstract
Neurotensin receptor 2 (NTS2) is a well-known mediator of central opioid-independent analgesia. Seminal studies have highlighted NTS2 overexpression in a variety of tumors including prostate cancer, pancreas adenocarcinoma, and breast cancer. Herein, we describe the first radiometalated neurotensin analogue targeting NTS2. JMV 7488 (DOTA-(βAla)2-Lys-Lys-Pro-(D)Trp-Ile-TMSAla-OH) was prepared using solid-phase peptide synthesis, then purified, radiolabeled with 68Ga and 111In, and investigated in vitro on HT-29 cells and MCF-7 cells, respectively, and in vivo on HT-29 xenografts. [68Ga]Ga-JMV 7488 and [111In]In-JMV 7488 were quite hydrophilic (logD7.4 = -3.1 ± 0.2 and -2.7 ± 0.2, respectively, p < 0.0001). Saturation binding studies showed good affinity toward NTS2 (K D = 38 ± 17 nM for [68Ga]Ga-JMV 7488 on HT-29 and 36 ± 10 nM on MCF-7 cells; K D = 36 ± 4 nM for [111In]In-JMV 7488 on HT-29 and 46 ± 1 nM on MCF-7 cells) and good selectivity (no NTS1 binding up to 500 nM). On cell-based evaluation, [68Ga]Ga-JMV 7488 and [111In]In-JMV 7488 showed high and fast NTS2-mediated internalization of 24 ± 5 and 25 ± 11% at 1 h for [111In]In-JMV 7488, respectively, along with low NTS2-membrane binding (<8%). Efflux was as high as 66 ± 9% at 45 min for [68Ga]Ga-JMV 7488 on HT-29 and increased for [111In]In-JMV 7488 up to 73 ± 16% on HT-29 and 78 ± 9% on MCF-7 cells at 2 h. Maximum intracellular calcium mobilization of JMV 7488 was 91 ± 11% to that of levocabastine, a known NTS2 agonist on HT-29 cells demonstrating the agonist behavior of JMV 7488. In nude mice bearing HT-29 xenograft, [68Ga]Ga-JMV 7488 showed a moderate but promising significant tumor uptake in biodistribution studies that competes well with other nonmetalated radiotracers targeting NTS2. Significant uptake was also depicted in lungs. Interestingly, mice prostate also demonstrated [68Ga]Ga-JMV 7488 uptake although the mechanism was not NTS2-mediated.
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Affiliation(s)
- Sacha Bodin
- Department
of Nuclear Medicine, University Hospital
of Bordeaux, 33076 Bordeaux, France
- University
of Bordeaux, CNRS, EPHE, INCIA, UMR 5287, Bordeaux F-33000, France
| | - Santo Previti
- Institut
des Biomolécules Max Mousseron, IBMM, UMR 5247, CNRS, Université
de Montpellier, ENSCM, 1919 route de Mende, 34293 Montpellier cedex 5, France
| | - Emmanuelle Jestin
- Cyclotron
Réunion Océan Indien CYROI, 2 rue Maxime Rivière, 97490 Sainte Clotilde, France
| | - Delphine Vimont
- University
of Bordeaux, CNRS, EPHE, INCIA, UMR 5287, Bordeaux F-33000, France
| | - Imade Ait-Arsa
- Cyclotron
Réunion Océan Indien CYROI, 2 rue Maxime Rivière, 97490 Sainte Clotilde, France
| | - Frédéric Lamare
- Department
of Nuclear Medicine, University Hospital
of Bordeaux, 33076 Bordeaux, France
- University
of Bordeaux, CNRS, EPHE, INCIA, UMR 5287, Bordeaux F-33000, France
| | - Emmanuelle Rémond
- Institut
des Biomolécules Max Mousseron, IBMM, UMR 5247, CNRS, Université
de Montpellier, ENSCM, 1919 route de Mende, 34293 Montpellier cedex 5, France
| | - Elif Hindié
- Department
of Nuclear Medicine, University Hospital
of Bordeaux, 33076 Bordeaux, France
- University
of Bordeaux, CNRS, EPHE, INCIA, UMR 5287, Bordeaux F-33000, France
- Institut
Universitaire de France, 1 rue Descartes, 75231 Paris, France
| | - Florine Cavelier
- Institut
des Biomolécules Max Mousseron, IBMM, UMR 5247, CNRS, Université
de Montpellier, ENSCM, 1919 route de Mende, 34293 Montpellier cedex 5, France
| | - Clément Morgat
- Department
of Nuclear Medicine, University Hospital
of Bordeaux, 33076 Bordeaux, France
- University
of Bordeaux, CNRS, EPHE, INCIA, UMR 5287, Bordeaux F-33000, France
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2
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Ehrlich AT, Couvineau P, Schamiloglu S, Wojcik S, Da Fonte D, Mezni A, von Zastrow M, Bender KJ, Bouvier M, Kieffer BL. Visualization of real-time receptor endocytosis in dopamine neurons enabled by NTSR1-Venus knock-in mice. Front Cell Neurosci 2022; 16:1076599. [DOI: 10.3389/fncel.2022.1076599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 11/11/2022] [Indexed: 11/30/2022] Open
Abstract
Dopamine (DA) neurons are primarily concentrated in substantia nigra (SN) and ventral tegmental area (VTA). A subset of these neurons expresses the neurotensin receptor NTSR1 and its putative ligand neurotensin (Nts). NTSR1, a G protein-coupled receptor (GPCR), which classically activates Gαq/calcium signaling, is a potential route for modulating DA activity. Drug development efforts have been hampered by the receptor’s complex pharmacology and a lack of understanding about its endogenous location and signaling responses. Therefore, we have generated NTSR1-Venus knock-in (KI) mice to study NTSR1 receptors in their physiological context. In primary hippocampal neurons, we show that these animals express functional receptors that respond to agonists by increasing intracellular calcium release and trafficking to endosomes. Moreover, systemic agonist administration attenuates locomotion in KIs as it does in control animals. Mapping receptor protein expression at regional and cellular levels, located NTSR1-Venus on the soma and dendrites of dopaminergic SN/VTA neurons. Direct monitoring of receptor endocytosis, as a proxy for activation, enabled profiling of NTSR1 agonists in neurons, as well as acute SN/VTA containing brain slices. Taken together, NTSR1-Venus animals express traceable receptors that will improve understanding of NTSR1 and DA activities and more broadly how GPCRs act in vivo.
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3
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Kyriatzis G, Bernard A, Bôle A, Pflieger G, Chalas P, Masse M, Lécorché P, Jacquot G, Ferhat L, Khrestchatisky M. Neurotensin receptor 2 is induced in astrocytes and brain endothelial cells in relation to neuroinflammation following pilocarpine-induced seizures in rats. Glia 2021; 69:2618-2643. [PMID: 34310753 DOI: 10.1002/glia.24062] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 06/30/2021] [Accepted: 07/09/2021] [Indexed: 12/14/2022]
Abstract
Neurotensin (NT) acts as a primary neurotransmitter and neuromodulator in the CNS and has been involved in a number of CNS pathologies including epilepsy. NT mediates its central and peripheral effects by interacting with the NTSR1, NTSR2, and Sort1/NTSR3 receptor subtypes. To date, little is known about the precise expression of the NT receptors in brain neural cells and their regulation in pathology. In the present work, we studied the cellular distribution of the NTSR2 protein in the rat hippocampus and questioned whether its expression was modulated in conditions of neuroinflammation using a model of temporal lobe epilepsy induced by pilocarpine. This model is characterized by a rapid and intense inflammatory reaction with reactive gliosis in the hippocampus. We show that NTSR2 protein is expressed in hippocampal astrocytes and its expression increases together with astrocyte reactivity following induction of status epilepticus. NTSR2 immunoreactivity is also increased in astrocytes proximal to blood vessels and their end-feet, and in endothelial cells. Proinflammatory factors such as IL1β and LPS induced NTSR2 mRNA and protein in cultured astroglial cells. Antagonizing NTSR2 with SR142948A decreased NTSR2 expression as well as astroglial reactivity. Together, our results suggest that NTSR2 is implicated in astroglial and gliovascular inflammation and that targeting the NTSR2 receptor may open new avenues in the regulation of neuroinflammation in CNS diseases.
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Affiliation(s)
- Grigorios Kyriatzis
- Aix-Marseille University, CNRS, INP, Institute of NeuroPhysiopathology, Marseille Cedex, France
| | - Anne Bernard
- Aix-Marseille University, CNRS, INP, Institute of NeuroPhysiopathology, Marseille Cedex, France
| | - Angélique Bôle
- Aix-Marseille University, CNRS, INP, Institute of NeuroPhysiopathology, Marseille Cedex, France
| | - Guillaume Pflieger
- Aix-Marseille University, CNRS, INP, Institute of NeuroPhysiopathology, Marseille Cedex, France
| | - Petros Chalas
- Aix-Marseille University, CNRS, INP, Institute of NeuroPhysiopathology, Marseille Cedex, France
| | - Maxime Masse
- VECT-HORUS, Faculté de Médecine, Marseille Cedex, France
| | | | | | - Lotfi Ferhat
- Aix-Marseille University, CNRS, INP, Institute of NeuroPhysiopathology, Marseille Cedex, France
| | - Michel Khrestchatisky
- Aix-Marseille University, CNRS, INP, Institute of NeuroPhysiopathology, Marseille Cedex, France
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4
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Abbaci A, Talbot H, Saada S, Gachard N, Abraham J, Jaccard A, Bordessoule D, Fauchais AL, Naves T, Jauberteau MO. Neurotensin receptor type 2 protects B-cell chronic lymphocytic leukemia cells from apoptosis. Oncogene 2017; 37:756-767. [PMID: 29059151 PMCID: PMC5808079 DOI: 10.1038/onc.2017.365] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Revised: 07/29/2017] [Accepted: 08/25/2017] [Indexed: 02/06/2023]
Abstract
B-cell chronic lymphocytic leukemia (B-CLL) cells are resistant to apoptosis, and consequently accumulate to the detriment of normal B cells and patient immunity. Because current therapies fail to eradicate these apoptosis-resistant cells, it is essential to identify alternative survival pathways as novel targets for anticancer therapies. Overexpression of cell-surface G protein-coupled receptors drives cell transformation, and thus plays a critical role in malignancies. In this study, we identified neurotensin receptor 2 (NTSR2) as an essential driver of apoptosis resistance in B-CLL. NTSR2 was highly expressed in B-CLL cells, whereas expression of its natural ligand, neurotensin (NTS), was minimal in both B-CLL cells and patient plasma. Surprisingly, NTSR2 remained in a constitutively active phosphorylated state, caused not by a mutation-induced gain-of-function but rather by an interaction with the oncogenic tyrosine kinase receptor TrkB. Functional and biochemical characterization revealed that the NTSR2-TrkB interaction acts as a conditional oncogenic driver requiring the TrkB ligand brain-derived neurotrophic factor (BDNF), which unlike NTS is highly expressed in B-CLL cells. Together, NTSR2, TrkB and BDNF induce autocrine and/or paracrine survival pathways that are independent of mutation status and indolent or progressive disease course. The NTSR2-TrkB interaction activates survival signaling pathways, including the Src and AKT kinase pathways, as well as expression of the anti-apoptotic proteins Bcl-2 and Bcl-xL. When NTSR2 was downregulated, TrkB failed to protect B-CLL cells from a drastic decrease in viability via typical apoptotic cell death, reflected by DNA fragmentation and Annexin V presentation. Together, our findings demonstrate that the NTSR2-TrkB interaction plays a crucial role in B-CLL cell survival, suggesting that inhibition of NTSR2 represents a promising targeted strategy for treating B-CLL malignancy.
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Affiliation(s)
- A Abbaci
- Limoges University, Equipe Accueil 3842, Cellular Homeostasis and Diseases, Faculty of Medicine, Limoges Cedex, France
| | - H Talbot
- Limoges University, Equipe Accueil 3842, Cellular Homeostasis and Diseases, Faculty of Medicine, Limoges Cedex, France
| | - S Saada
- Limoges University, Equipe Accueil 3842, Cellular Homeostasis and Diseases, Faculty of Medicine, Limoges Cedex, France
| | - N Gachard
- Hematology Laboratory, Dupuytren Hospital University Center of Limoges, Limoges Cedex, France.,CNRS-UMR 7276, Limoges University, Limoges Cedex, France
| | - J Abraham
- Department of Hematology, Dupuytren Hospital University Center of Limoges, Limoges Cedex, France
| | - A Jaccard
- CNRS-UMR 7276, Limoges University, Limoges Cedex, France.,Department of Hematology, Dupuytren Hospital University Center of Limoges, Limoges Cedex, France
| | - D Bordessoule
- CNRS-UMR 7276, Limoges University, Limoges Cedex, France.,Department of Hematology, Dupuytren Hospital University Center of Limoges, Limoges Cedex, France
| | - A L Fauchais
- Limoges University, Equipe Accueil 3842, Cellular Homeostasis and Diseases, Faculty of Medicine, Limoges Cedex, France.,Department of Internal Medicine, Dupuytren Hospital University Center of Limoges, Limoges Cedex, France
| | - T Naves
- Limoges University, Equipe Accueil 3842, Cellular Homeostasis and Diseases, Faculty of Medicine, Limoges Cedex, France
| | - M O Jauberteau
- Limoges University, Equipe Accueil 3842, Cellular Homeostasis and Diseases, Faculty of Medicine, Limoges Cedex, France.,Department of Immunology, Dupuytren Hospital University Center of Limoges, Limoges Cedex, France
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5
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mGlu5 receptors regulate synaptic sumoylation via a transient PKC-dependent diffusional trapping of Ubc9 into spines. Nat Commun 2014; 5:5113. [PMID: 25311713 DOI: 10.1038/ncomms6113] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Accepted: 09/01/2014] [Indexed: 12/27/2022] Open
Abstract
Sumoylation plays important roles in the modulation of protein function, neurotransmission and plasticity, but the mechanisms regulating this post-translational system in neurons remain largely unknown. Here we demonstrate that the synaptic diffusion of Ubc9, the sole conjugating enzyme of the sumoylation pathway, is regulated by synaptic activity. We use restricted photobleaching/photoconversion of individual hippocampal spines to measure the diffusion properties of Ubc9 and show that it is regulated through an mGlu5R-dependent signalling pathway. Increasing synaptic activity with a GABAA receptor antagonist or directly activating mGlu5R increases the synaptic residency time of Ubc9 via a Gαq/PLC/Ca(2+)/PKC cascade. This activation promotes a transient synaptic trapping of Ubc9 through a PKC phosphorylation-dependent increase of Ubc9 recognition to phosphorylated substrates and consequently leads to the modulation of synaptic sumoylation. Our data demonstrate that Ubc9 diffusion is subject to activity-dependent regulatory processes and provide a mechanism for the dynamic changes in sumoylation occurring during synaptic transmission.
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6
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Bhattacharya A, Sankar S, Panicker MM. Differences in the C-terminus contribute to variations in trafficking between rat and human 5-HT2Areceptor isoforms: identification of a primate-specific tripeptide ASK motif that confers GRK-2 and β arrestin-2 interactions. J Neurochem 2010; 112:723-32. [DOI: 10.1111/j.1471-4159.2009.06493.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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7
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Neurotensin receptor-2 and -3 are crucial for the anti-apoptotic effect of neurotensin on pancreatic β-TC3 cells. Int J Biochem Cell Biol 2009; 41:2398-402. [DOI: 10.1016/j.biocel.2009.04.002] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Hashimoto Y, Morisawa K, Saito H, Jojima E, Yoshida N, Haga T. Muscarinic M4 receptor recycling requires a motif in the third intracellular loop. J Pharmacol Exp Ther 2008; 325:947-53. [PMID: 18337477 DOI: 10.1124/jpet.107.135095] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The present study was performed to identify sequence(s) in the third intracellular loop (i3) of the muscarinic acetylcholine receptor M4 subtype (M4 receptor) involved in its internalization and recycling. In transiently transfected human embryonic kidney 293-tsA201 cells, 40 to 50% of cell-surface M4 receptors are internalized in an agonist-dependent manner, and approximately 65% of internalized receptors are recycled back to the cell surface after removal of the agonist. We examined the internalization and recycling of M4 receptor mutants with partial deletion in i3 and found that various mutants (M4del-K(235)-K(240), M4del-T(241)-K(271), and M4del-W(339)-N(372)) showed internalization and cell-surface recycling in a similar manner to the M4 receptor. We also found that the mutant M4del-L(272)-R(338) was internalized to only half the extent of the M4 receptor and was recycled after agonist removal, and the mutant M4del-V(373)-A(393) was also internalized to half the extent of the wild type but was not recycled back to the cell surface after agonist removal. When the sequence corresponding to Val(373)-Ala(393) was grafted onto the i3 portion of a recycling-negative mutant of muscarinic M2 receptor with deletion of almost the whole of the i3 sequence, approximately 40% of the chimeric receptor on the cell surface was internalized, and more than 65% of the internalized receptors were recycled back to the cell surface. These results indicate that the regions including Leu(272)-Arg(338) and Val(373)-Ala(393) are involved in internalization of the M4 receptor, and the region including Val(373)-Ala(393) is indispensable for its recycling, whereas the other regions of i3 are dispensable for internalization and recycling.
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Affiliation(s)
- Yuichi Hashimoto
- Institute for Biomolecular Science, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan.
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9
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Abstract
Neurotensin exerts its actions in the central nervous system and the periphery through three identified receptors. Two of them, the NTS2 and NTS3, display unusual properties either because of their complex signal transduction mechanisms (NTS2) or because of their structural composition as a non-G-protein-coupled receptor (NTS3). Here, we review the transduction mechanisms, cellular trafficking, and potential physiological roles of these two unconventional receptors.
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Affiliation(s)
- Jean Mazella
- Institut de Pharmacologie Moléculaire et Cellulaire, Unité Mixte de Recherche 6097 du Centre National de la Recherche Scientifique, et de l'Université de Nice Sophia Antipolis, Sophia Antipolis, 06560 Valbonne, France.
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10
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Mazella J, Vincent JP. Internalization and recycling properties of neurotensin receptors. Peptides 2006; 27:2488-92. [PMID: 16901585 DOI: 10.1016/j.peptides.2006.02.012] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2005] [Accepted: 02/12/2006] [Indexed: 11/16/2022]
Abstract
The targeting, internalization and recycling of membrane receptors in response to extracellular ligands involve a series of molecular mechanisms which are beginning to be better understood. The receptor-dependent internalization of neurotensin has been widely investigated using endogenous or heterologous receptor expression systems. This review focuses on the general properties of neurotensin sequestration and on the characterization of the receptors involved in this process.
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Affiliation(s)
- Jean Mazella
- Institut de Pharmacologie Moléculaire et Cellulaire, Unité Mixte de Recherche 6097 du Centre National de la Recherche Scientifique, et de l'Université de Nice-Sophia Antipolis, Sophia Antipolis, 06560 Valbonne, France.
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11
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Perron A, Sharif N, Gendron L, Lavallée M, Stroh T, Mazella J, Beaudet A. Sustained neurotensin exposure promotes cell surface recruitment of NTS2 receptors. Biochem Biophys Res Commun 2006; 343:799-808. [PMID: 16564027 DOI: 10.1016/j.bbrc.2006.03.047] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2006] [Accepted: 03/06/2006] [Indexed: 11/22/2022]
Abstract
In this study, we investigated whether persistent agonist stimulation of NTS2 receptors gives rise to down-regulation, in light of reports that their activation induced long-lasting effects. To address this issue, we incubated COS-7 cells expressing the rat NTS2 with neurotensin (NT) for up to 24 h and measured resultant cell surface [125I]-NT binding. We found that NTS2-expressing cells retained the same surface receptor density despite efficient internalization mechanisms. This preservation was neither due to NTS2 neosynthesis nor recycling since it was not blocked by cycloheximide or monensin. However, it appeared to involve translocation of spare receptors from internal stores, as NT induced NTS2 migration from trans-Golgi network to endosome-like structures. This stimulation-induced regulation of cell surface NTS2 receptors was even more striking in rat spinal cord neurons. Taken together, these results suggest that sustained NTS2 activation promotes recruitment of intracellular receptors to the cell surface, thereby preventing functional desensitization.
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Affiliation(s)
- Amélie Perron
- Montreal Neurological Institute, McGill University, Montreal, Que., Canada H3A 2B4
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12
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Piatek J, Witmanowski H, Paluszak J, Krauss H, Krawczyk J. The effects of neurotensin on selected parameters of lipid metabolism in rats. Peptides 2005; 26:837-43. [PMID: 15808914 DOI: 10.1016/j.peptides.2004.12.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2004] [Revised: 11/09/2004] [Accepted: 12/06/2004] [Indexed: 11/16/2022]
Abstract
15 nM/kg b.m. of neurotensin (NT) caused a significant inhibition of LMA within 30 min of administration and this effect persisted up for to the 240 th minute of the experiment. A 15 nM/kgb.m. dose also caused a reduction in SLA which persisted up to the 120 th minute. Sixty minutes after an intraperitoneal administration of NT a decrease in the cholesterol and NEFA levels and an increase in the TG and glycerol levels were observed. These effects were inhibited by the NTR2-blocker (levocabastine) and were not subject to change after an in vivo application of SR 48692.
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Affiliation(s)
- J Piatek
- Department of Physiology, University of Medical Sciences, Swiecickiego 6, 60781 Poznan, Poland.
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13
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Gendron L, Perron A, Payet MD, Gallo-Payet N, Sarret P, Beaudet A. Low-affinity neurotensin receptor (NTS2) signaling: internalization-dependent activation of extracellular signal-regulated kinases 1/2. Mol Pharmacol 2004; 66:1421-30. [PMID: 15361549 DOI: 10.1124/mol.104.002303] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The role and signaling properties of the low-affinity neurotensin receptor (NTS2) are still controversial. In particular, it is unclear whether neurotensin acts as an agonist, inverse agonist, or antagonist at this site. In view of the growing evidence for a role of NTS2 in antinociception, the elucidation of the pharmacological and coupling properties of this receptor is particularly critical. In the present study, we demonstrate that in Chinese hamster ovary (CHO) cells expressing the rat NTS2 receptor, neurotensin (NT), levocabastine, neuromedin N, and the high-affinity NT receptor antagonist SR48692 [2-[[1-(-7-chloroquinolin-4-yl)-5-(2,6-dimethoxyphenyl)-1H-pyrazole-3-carbonyl]amino]adamantane-2-carboxylic acid] all bind to and activate the NTS2 receptor. This activation is followed by ligand-induced internalization of receptor-ligand complexes, as evidenced by confocal microscopy using a fluorescent NT analog. All compounds tested produced a rapid and sustained activation of extracellular signal-regulated kinases 1/2 (ERK1/2) but were without specific effect on Ca(2+) mobilization. The agonist-induced activation of ERK1/2 was completely abolished by preincubation of the cells with the endocytosis inhibitors phenylarsine oxide and monodansylcadaverine as well as overexpression of a dominant-negative mutant of dynamin 1 (DynK44A), indicating that receptor internalization was required for ERK1/2 activation. NTS2-induced activation of ERK1/2 was not species-specific, because the same agonistic effects of NT and analogs were observed in CHO cells transfected with the human NTS2 receptor. In conclusion, this study demonstrates that NTS2 is a bona fide NT receptor and that activation of this receptor by NT or NT analogs results in an internalization-dependent activation of the ERK1/2 signaling cascade.
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Affiliation(s)
- Louis Gendron
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
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14
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Montiel M, Quesada J, Jiménez E. Activation of second messenger-dependent protein kinases induces muscarinic acetylcholine receptor desensitization in rat thyroid epithelial cells. Mol Cell Endocrinol 2004; 223:35-41. [PMID: 15279909 DOI: 10.1016/j.mce.2004.05.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2004] [Revised: 04/20/2004] [Accepted: 05/27/2004] [Indexed: 10/26/2022]
Abstract
Internalization and phosphorylation of G protein-coupled receptors (GPCR) are considered two important regulatory events of receptor signal transduction. In Fischer rat thyroid (FRT) epithelial cells, we have shown that muscarinic acetylcholine receptor (mAChR) stimulation induces intracellular Ca2+ mobilization via Ca2+ store release, capacitative Ca2+ entry and voltage-dependent Ca2+ channels activation. In the present study, the role of mAChR internalization and phosphorylation on receptor signalling pathway was examined by means of intracellular Ca2+ measurement in these cells. Exposure of FRT cells to carbachol (Cch), a mAChR agonist, resulted in a desensitization of receptor-mediated intracellular Ca2+ mobilization and induced the internalization of constitutively expressed mAChR in this cell type. Treatment of FRT cells with hypertonic sucrose, which markedly reduced agonist-receptor complex internalization, or phenylarsine oxide (PAO) diminished the Cch-induced intracellular Ca2+ response. Moreover, pretreatment of cells with phorbol-12-myristate-13-acetate (PMA), an activator of protein kinase C (PKC), completely abolished Cch-evoked Ca2+ mobilization, whereas it was significantly increased by the preincubation of cells with GF109203X, a selective inhibitor of PKC. We also found a marked decrease on Cch-stimulated Ca2+ mobilization in pretreated FRT cells with forskolin, an activator of protein kinase A (PKA), but the preincubation of cells with genistein, an inhibitor of protein tyrosine kinases, had no effect on Ca2+ mobilization induced by Cch. These findings seem to indicate that mAChR in FRT cells exhibit a desensitization, which may be mediated, at least in part, through activation of second messenger-dependent protein kinases and that receptor internalization could be necessary for signalling.
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Affiliation(s)
- Mercedes Montiel
- Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Universidad de Málaga, Campus de Teatinos s/n, 29071 Málaga, Spain
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Debaigt C, Hirling H, Steiner P, Vincent JP, Mazella J. Crucial role of neuron-enriched endosomal protein of 21 kDa in sorting between degradation and recycling of internalized G-protein-coupled receptors. J Biol Chem 2004; 279:35687-91. [PMID: 15187090 DOI: 10.1074/jbc.m402751200] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Recycling of endocytosed G-protein-coupled receptors involves a series of molecular events through early and recycling endosomes. The purpose of this work was to study the role of neuron-enriched endosomal protein of 21 kDa (NEEP21) in the recycling process of neurotensin receptors-1 and -2. Here we showed that suppression of NEEP21 expression does not modify the internalization rate of both receptors but strongly inhibited the recycling of the neurotensin receptor-2. In contrast, overexpression of NEEP21 changes the behavior of the neurotensin receptor-1 from a non-recycling to a recycling state. Recycling of the neurotensin receptor-2 involves both the phosphatidylinositol 3-kinase and the recycling endosome pathways, whereas recycling of the neurotensin receptor-1 induced by overexpression of NEEP21 only occurs by the phosphatidylinositol 3-kinase-dependent pathway. Taken together, these results confirm the essential role of NEEP21 in the recycling mechanism and show that this protein acts at the level of early endosomes to promote sorting of receptors toward a recycling pathway.
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Affiliation(s)
- Colin Debaigt
- Institut de Pharmacologie Moléculaire et Cellulaire, Unité Mixte de Recherche 6097 du Centre National de la Recherche Scientifique, 660 route des Lucioles, Sophia Antipolis, 06560 Valbonne, France
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Toy-Miou-Leong M, Cortes CL, Beaudet A, Rostène W, Forgez P. Receptor trafficking via the perinuclear recycling compartment accompanied by cell division is necessary for permanent neurotensin cell sensitization and leads to chronic mitogen-activated protein kinase activation. J Biol Chem 2003; 279:12636-46. [PMID: 14699144 DOI: 10.1074/jbc.m303384200] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Most G protein-coupled receptors are internalized after interaction with their respective ligand, a process that subsequently contributes to cell desensitization, receptor endocytosis, trafficking, and finally cell resensitization. Although cellular mechanisms leading to cell desensitization have been widely studied, those responsible for cell resensitization are still poorly understood. We examined here the traffic of the high affinity neurotensin receptor (NT1 receptor) following prolonged exposure to high agonist concentration. Fluorescence and confocal microscopy of Chinese hamster ovary, human neuroblastoma (CHP 212), and murine neuroblastoma (N1E-115) cells expressing green fluorescent protein-tagged NT1 receptor revealed that under prolonged treatment with saturating concentrations of neurotensin (NT) agonist, NT1 receptor and NT transiently accumulated in the perinuclear recycling compartment (PNRC). During this cellular event, cell surface receptors remained markedly depleted as detected by both confocal microscopy and (125)I-NT binding assays. In dividing cells, we observed that following prolonged NT agonist stimulation, NT1 receptors were removed from the PNRC, accumulated in dispersed vesicles inside the cytoplasm, and subsequently reappeared at the cell surface. This NT binding recovery allowed for constant cell sensitization and led to a chronic activation of mitogen-activated protein kinases p42 and p44. Under these conditions, the constant activation of NT1 receptor generates an oncogenic regulation. These observations support the potent role for neuropeptides, such as NT, in cancer progression.
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Affiliation(s)
- Mireille Toy-Miou-Leong
- INSERM Unit 482, Hôpital Saint-Antoine, 184 Rue du Faubourg Saint-Antoine, 75012 Paris, France
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Chapter VI Neurotensin receptors in the central nervous system. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0924-8196(02)80008-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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