1
|
Hazan S, Tauber M, Ben-Chaim Y. Voltage dependence of M2 muscarinic receptor antagonists and allosteric modulators. Biochem Pharmacol 2024; 227:116421. [PMID: 38996933 DOI: 10.1016/j.bcp.2024.116421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Revised: 06/12/2024] [Accepted: 07/09/2024] [Indexed: 07/14/2024]
Abstract
Muscarinic receptors are G protein-coupled receptors (GPCRs) that play a role in various physiological functions. Previous studies have shown that these receptors, along with other GPCRs, are voltage-sensitive; both their affinity toward agonists and their activation are regulated by membrane potential. To our knowledge, whether the effect of antagonists on these receptors is voltage-dependent has not yet been studied. In this study, we used Xenopus oocytes expressing the M2 muscarinic receptor (M2R) to investigate this question. Our results indicate that the potencies of two M2R antagonists, atropine and scopolamine, are voltage-dependent; they are more effective at resting potential than under depolarization. In contrast, the M2R antagonist AF-DX 386 did not exhibit voltage-dependent potency.Furthermore, we discovered that the voltage dependence of M2R activation by acetylcholine remains unchanged in the presence of two allosteric modulators, the negative modulator gallamine and the positive modulator LY2119620. These findings enhance our understanding of GPCRs' voltage dependence and may have pharmacological implications.
Collapse
Affiliation(s)
- Shimrit Hazan
- Department of Natural Sciences, The Open University of Israel, Ra'anana, Israel
| | - Merav Tauber
- Department of Natural Sciences, The Open University of Israel, Ra'anana, Israel
| | - Yair Ben-Chaim
- Department of Natural Sciences, The Open University of Israel, Ra'anana, Israel.
| |
Collapse
|
2
|
Heppner TJ, Fallon HJ, Rengo JL, Beaulieu EM, Hennig GW, Nelson MT, Herrera GM. Urothelium-derived prostanoids enhance contractility of urinary bladder smooth muscle and stimulate bladder afferent nerve activity in the mouse. Am J Physiol Regul Integr Comp Physiol 2024; 327:R97-R108. [PMID: 38780425 PMCID: PMC11334713 DOI: 10.1152/ajpregu.00084.2024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2024] [Revised: 05/03/2024] [Accepted: 05/22/2024] [Indexed: 05/25/2024]
Abstract
The transitional epithelial cells (urothelium) that line the lumen of the urinary bladder form a barrier between potentially harmful pathogens, toxins, and other bladder contents and the inner layers of the bladder wall. The urothelium, however, is not simply a passive barrier, as it can produce signaling factors, such as ATP, nitric oxide, prostaglandins, and other prostanoids, that can modulate bladder function. We investigated whether substances produced by the urothelium could directly modulate the contractility of the underlying urinary bladder smooth muscle. Force was measured in isolated strips of mouse urinary bladder with the urothelium intact or denuded. Bladder strips developed spontaneous tone and phasic contractions. In urothelium-intact strips, basal tone, as well as the frequency and amplitude of phasic contractions, were 25%, 32%, and 338% higher than in urothelium-denuded strips, respectively. Basal tone and phasic contractility in urothelium-intact bladder strips were abolished by the cyclooxygenase (COX) inhibitor indomethacin (10 µM) or the voltage-dependent Ca2+ channel blocker diltiazem (50 µM), whereas blocking neuronal sodium channels with tetrodotoxin (1 µM) had no effect. These results suggest that prostanoids produced in the urothelium enhance smooth muscle tone and phasic contractions by activating voltage-dependent Ca2+ channels in the underlying bladder smooth muscle. We went on to demonstrate that blocking COX inhibits the generation of transient pressure events in isolated pressurized bladders and greatly attenuates the afferent nerve activity during bladder filling, suggesting that urothelial prostanoids may also play a role in sensory nerve signaling.NEW & NOTEWORTHY This paper provides evidence for the role of urothelial-derived prostanoids in maintaining tone in the urinary bladder during bladder filling, not only underscoring the role of the urothelium as more than a barrier but also contributing to active regulation of the urinary bladder. Furthermore, cyclooxygenase products greatly augment sensory nerve activity generated by bladder afferents during bladder filling and thus may play a role in perception of bladder fullness.
Collapse
Affiliation(s)
- Thomas J Heppner
- Department of Pharmacology, University of Vermont, Burlington, Vermont, United States
| | - Hannah J Fallon
- Department of Pharmacology, University of Vermont, Burlington, Vermont, United States
| | - Jason L Rengo
- Department of Pharmacology, University of Vermont, Burlington, Vermont, United States
| | - Elleanor M Beaulieu
- Department of Pharmacology, University of Vermont, Burlington, Vermont, United States
| | - Grant W Hennig
- Department of Pharmacology, University of Vermont, Burlington, Vermont, United States
| | - Mark T Nelson
- Department of Pharmacology, University of Vermont, Burlington, Vermont, United States
- Division of Cardiovascular Sciences, University of Manchester, Manchester, United Kingdom
| | - Gerald M Herrera
- Department of Pharmacology, University of Vermont, Burlington, Vermont, United States
| |
Collapse
|
3
|
Borroto-Escuela DO, Gonzalez-Cristo E, Ochoa-Torres V, Serra-Rojas EM, Ambrogini P, Arroyo-García LE, Fuxe K. Understanding electrical and chemical transmission in the brain. Front Cell Neurosci 2024; 18:1398862. [PMID: 38988663 PMCID: PMC11233782 DOI: 10.3389/fncel.2024.1398862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2024] [Accepted: 06/14/2024] [Indexed: 07/12/2024] Open
Abstract
The histochemical Falck-Hillarp method for the localization of dopamine (DA), noradrenaline (NA) and serotonin in the central nervous system (CNS) of rodents was introduced in the 1960s. It supported the existence of chemical neurotransmission in the CNS. The monoamine neurons in the lower brain stem formed monosynaptic ascending systems to the telencephalon and diencephalon and monoamine descending systems to the entire spinal cord. The monoamines were early on suggested to operate via synaptic chemical transmission in the CNS. This chemical transmission reduced the impact of electrical transmission. In 1969 and the 1970s indications were obtained that important modes of chemical monoamine communication in the CNS also took place through the extra-synaptic fluid, the extracellular fluid, and long-distance communication in the cerebrospinal fluid involving diffusion and flow of transmitters like DA, NA and serotonin. In 1986, this type of transmission was named volume transmission (VT) by Agnati and Fuxe and their colleagues, also characterized by transmitter varicosity and receptor mismatches. The short and long-distance VT pathways were characterized by volume fraction, tortuosity and clearance. Electrical transmission also exists in the mammalian CNS, but chemical transmission is in dominance. One electrical mode is represented by electrical synapses formed by gap junctions which represent low resistant passages between nerve cells. It allows for a more rapid passage of action potentials between nerve cells compared to chemical transmission. The second mode is based on the ability of synaptic currents to generate electrical fields to modulate chemical transmission. One aim is to understand how chemical transmission can be integrated with electrical transmission and how putative (aquaporin water channel, dopamine D2R and adenosine A2AR) complexes in astrocytes can significancy participate in the clearance of waste products from the glymphatic system. VT may also help accomplish the operation of the acupuncture meridians essential for Chinese medicine in view of the indicated existence of extracellular VT pathways.
Collapse
Affiliation(s)
- Dasiel O. Borroto-Escuela
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
- Receptomics and Brain Disorders Lab, Department of Human Physiology Physical Education and Sport, Faculty of Medicine, University of Malaga, Málaga, Spain
| | - Emmanuell Gonzalez-Cristo
- Receptomics and Brain Disorders Lab, Department of Human Physiology Physical Education and Sport, Faculty of Medicine, University of Malaga, Málaga, Spain
| | - Verty Ochoa-Torres
- Receptomics and Brain Disorders Lab, Department of Human Physiology Physical Education and Sport, Faculty of Medicine, University of Malaga, Málaga, Spain
- Faculty of Engineering and Biotechnology, University OTR and the Regional Cooperative for Comprehensive Medical Assistance (CRAMI), Montevideo, Uruguay
| | - Emilio M. Serra-Rojas
- Receptomics and Brain Disorders Lab, Department of Human Physiology Physical Education and Sport, Faculty of Medicine, University of Malaga, Málaga, Spain
- Cardiology Service, Lozano Blesa University Clinical Hospital, Zaragoza, Spain
| | - Patrizia Ambrogini
- Department of Biomolecular Sciences, Università di Urbino Carlo Bo, Urbino, Italy
| | - Luis E. Arroyo-García
- Division of Neurogeriatrics, Department of Neurobiology, Care Sciences, and Society, Karolinska Institutet, Stockholm, Sweden
| | - Kjell Fuxe
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| |
Collapse
|
4
|
Boutonnet M, Carpena C, Bouquier N, Chastagnier Y, Font-Ingles J, Moutin E, Tricoire L, Chemin J, Perroy J. Voltage tunes mGlu 5 receptor function, impacting synaptic transmission. Br J Pharmacol 2024; 181:1793-1811. [PMID: 38369690 DOI: 10.1111/bph.16317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 12/08/2023] [Accepted: 12/29/2023] [Indexed: 02/20/2024] Open
Abstract
BACKGROUND AND PURPOSE Voltage sensitivity is a common feature of many membrane proteins, including some G-protein coupled receptors (GPCRs). However, the functional consequences of voltage sensitivity in GPCRs are not well understood. EXPERIMENTAL APPROACH In this study, we investigated the voltage sensitivity of the post-synaptic metabotropic glutamate receptor mGlu5 and its impact on synaptic transmission. Using biosensors and electrophysiological recordings in non-excitable HEK293T cells or neurons. KEY RESULTS We found that mGlu5 receptor function is optimal at resting membrane potentials. We observed that membrane depolarization significantly reduced mGlu5 receptor activation, Gq-PLC/PKC stimulation, Ca2+ release and mGlu5 receptor-gated currents through transient receptor potential canonical, TRPC6, channels or glutamate ionotropic NMDA receptors. Notably, we report a previously unknown activity of the NMDA receptor at the resting potential of neurons, enabled by mGlu5. CONCLUSIONS AND IMPLICATIONS Our findings suggest that mGlu5 receptor activity is directly regulated by membrane voltage which may have a significant impact on synaptic processes and pathophysiological functions.
Collapse
Affiliation(s)
- Marin Boutonnet
- IGF, University of Montpellier, CNRS, INSERM, Montpellier, France
| | - Camille Carpena
- IGF, University of Montpellier, CNRS, INSERM, Montpellier, France
| | | | - Yan Chastagnier
- IGF, University of Montpellier, CNRS, INSERM, Montpellier, France
| | - Joan Font-Ingles
- IGF, University of Montpellier, CNRS, INSERM, Montpellier, France
- SpliceBio, Barcelona, Spain
| | - Enora Moutin
- IGF, University of Montpellier, CNRS, INSERM, Montpellier, France
| | - Ludovic Tricoire
- Neuroscience Paris Seine, Institut de biologie Paris Seine, Sorbonne universite, CNRS, INSERM, Paris, France
| | - Jean Chemin
- IGF, University of Montpellier, CNRS, INSERM, Montpellier, France
| | - Julie Perroy
- IGF, University of Montpellier, CNRS, INSERM, Montpellier, France
| |
Collapse
|
5
|
Tauber M, Ben-Chaim Y. Voltage Sensors Embedded in G Protein-Coupled Receptors. Int J Mol Sci 2024; 25:5295. [PMID: 38791333 PMCID: PMC11120775 DOI: 10.3390/ijms25105295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Revised: 05/08/2024] [Accepted: 05/09/2024] [Indexed: 05/26/2024] Open
Abstract
Some signaling processes mediated by G protein-coupled receptors (GPCRs) are modulated by membrane potential. In recent years, increasing evidence that GPCRs are intrinsically voltage-dependent has accumulated. A recent publication challenged the view that voltage sensors are embedded in muscarinic receptors. Herein, we briefly discuss the evidence that supports the notion that GPCRs themselves are voltage-sensitive proteins and an alternative mechanism that suggests that voltage-gated sodium channels are the voltage-sensing molecules involved in such processes.
Collapse
Affiliation(s)
| | - Yair Ben-Chaim
- Department of Natural Sciences, The Open University of Israel, Ra’anana 4353701, Israel
| |
Collapse
|
6
|
Kurz M, Ulrich M, Bittner A, Bünemann M. DP2 receptor activity sensor suited for antagonist screening and measurement of receptor dynamics in real-time. Sci Rep 2024; 14:8178. [PMID: 38589416 PMCID: PMC11374897 DOI: 10.1038/s41598-024-58410-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Accepted: 03/28/2024] [Indexed: 04/10/2024] Open
Abstract
The DP2 receptor is a G-protein coupled receptor involved in allergic inflammation and is the target of recently developed antagonists already being tested in clinics. To get insights into DP2 receptor dynamics and to study its pharmacology on the level of the receptor, we constructed a fluorescence resonance energy transfer-based conformation sensor. The sensor reflects the selectivity profile of the DP2 receptor-wt and is suited for screening of agonists and antagonists due to its robust response. Furthermore, the sensor enables the direct measurement of DP2 receptor dynamics in real-time and revealed markedly distinct on- and off-rates of prostaglandin D2 between DP2 and DP1 receptors, suggesting a different mechanism of ligand receptor interaction.
Collapse
Affiliation(s)
- Michael Kurz
- Faculty of Pharmacy, Institute for Pharmacology and Clinical Pharmacy, Philipps-University Marburg, Marburg, Germany
| | - Michaela Ulrich
- Faculty of Pharmacy, Institute for Pharmacology and Clinical Pharmacy, Philipps-University Marburg, Marburg, Germany
| | - Alwina Bittner
- Faculty of Pharmacy, Institute for Pharmacology and Clinical Pharmacy, Philipps-University Marburg, Marburg, Germany
| | - Moritz Bünemann
- Faculty of Pharmacy, Institute for Pharmacology and Clinical Pharmacy, Philipps-University Marburg, Marburg, Germany.
| |
Collapse
|
7
|
Kirchhofer SB, Lim VJY, Ernst S, Karsai N, Ruland JG, Canals M, Kolb P, Bünemann M. Differential interaction patterns of opioid analgesics with µ opioid receptors correlate with ligand-specific voltage sensitivity. eLife 2023; 12:e91291. [PMID: 37983079 PMCID: PMC10849675 DOI: 10.7554/elife.91291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Accepted: 11/19/2023] [Indexed: 11/21/2023] Open
Abstract
The µ opioid receptor (MOR) is the key target for analgesia, but the application of opioids is accompanied by several issues. There is a wide range of opioid analgesics, differing in their chemical structure and their properties of receptor activation and subsequent effects. A better understanding of ligand-receptor interactions and the resulting effects is important. Here, we calculated the respective binding poses for several opioids and analyzed interaction fingerprints between ligand and receptor. We further corroborated the interactions experimentally by cellular assays. As MOR was observed to display ligand-induced modulation of activity due to changes in membrane potential, we further analyzed the effects of voltage sensitivity on this receptor. Combining in silico and in vitro approaches, we defined discriminating interaction patterns responsible for ligand-specific voltage sensitivity and present new insights into their specific effects on activation of the MOR.
Collapse
Affiliation(s)
- Sina B Kirchhofer
- Department of Pharmacology and Clinical Pharmacy, University of MarburgMarburgGermany
- Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, Queen's Medical Centre, University of NottinghamNottinghamUnited Kingdom
- Centre of Membrane Protein and Receptors, Universities of Birmingham and NottinghamMidlandsUnited Kingdom
| | - Victor Jun Yu Lim
- Department of Pharmaceutical Chemistry, University of MarburgMarburgGermany
| | - Sebastian Ernst
- Department of Pharmacology and Clinical Pharmacy, University of MarburgMarburgGermany
| | - Noemi Karsai
- Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, Queen's Medical Centre, University of NottinghamNottinghamUnited Kingdom
- Centre of Membrane Protein and Receptors, Universities of Birmingham and NottinghamMidlandsUnited Kingdom
| | - Julia G Ruland
- Department of Pharmacology and Clinical Pharmacy, University of MarburgMarburgGermany
| | - Meritxell Canals
- Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, Queen's Medical Centre, University of NottinghamNottinghamUnited Kingdom
- Centre of Membrane Protein and Receptors, Universities of Birmingham and NottinghamMidlandsUnited Kingdom
| | - Peter Kolb
- Department of Pharmaceutical Chemistry, University of MarburgMarburgGermany
| | - Moritz Bünemann
- Department of Pharmacology and Clinical Pharmacy, University of MarburgMarburgGermany
| |
Collapse
|
8
|
Tauber M, Ben-Chaim Y. Functional consequences of a rare human serotonergic 5-HT 1A receptor variant. Front Pharmacol 2023; 14:1270726. [PMID: 37795037 PMCID: PMC10547147 DOI: 10.3389/fphar.2023.1270726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 09/08/2023] [Indexed: 10/06/2023] Open
Abstract
Serotonin (5-HT) plays a central role in various brain functions via the activation of a family of receptors, most of them G protein coupled receptors (GPCRs). 5-HT1A receptor, the most abundant 5-HT receptors, was implicated in many brain dysfunctions and is a major target for drug discovery. Several genetic polymorphisms within the 5-HT1A receptor gene were identified and linked to different conditions, including anxiety and depression. Here, we used Xenopus oocytes to examine the effects of one of the functional polymorphism, Arg220Leu, on the function of the receptor. We found that the mutated receptor shows normal activation of G protein and normal 5-HT binding. On the other hand, the mutated receptor shows impaired desensitization, probably due to impairment in activation of β arrestin-dependent pathway. Furthermore, while the 5-HT1A receptor was shown to exhibit voltage dependent activation by serotonin and by buspirone, the mutated receptor was voltage-independent. Our results suggest a pronounced effect of the mutation on the function of the 5-HT1A receptor and add to our understanding of the molecular mechanism of its voltage dependence. Moreover, the findings of this study may suggest a functional explanation for the possible link between this variant and brain pathologies.
Collapse
Affiliation(s)
| | - Yair Ben-Chaim
- Department of Natural Sciences, The Open University of Israel, Ra’anana, Israel
| |
Collapse
|
9
|
Kurz M, Ulrich M, Bittner A, Scharf MM, Shao J, Wallenstein I, Lemoine H, Wettschureck N, Kolb P, Bünemann M. EP4 Receptor Conformation Sensor Suited for Ligand Screening and Imaging of Extracellular Prostaglandins. Mol Pharmacol 2023; 104:80-91. [PMID: 37442628 DOI: 10.1124/molpharm.122.000648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 05/11/2023] [Accepted: 06/01/2023] [Indexed: 07/15/2023] Open
Abstract
Prostaglandins are important lipid mediators with a wide range of functions in the human body. They act mainly via plasma membrane localized prostaglandin receptors, which belong to the G-protein coupled receptor class. Due to their localized formation and short lifetime, it is important to be able to measure the distribution and abundance of prostaglandins in time and/or space. In this study, we present a Foerster resonance energy transfer (FRET)-based conformation sensor of the human prostaglandin E receptor subtype 4 (EP4 receptor), which was capable of detecting prostaglandin E2 (PGE2)-induced receptor activation in the low nanomolar range with a good signal-to-noise ratio. The sensor retained the typical selectivity for PGE2 among arachidonic acid products. Human embryonic kidney cells stably expressing the sensor did not produce detectable amounts of prostaglandins making them suitable for a coculture approach allowing us, over time, to detect prostaglandin formation in Madin-Darby canine kidney cells and primary mouse macrophages. Furthermore, the EP4 receptor sensor proved to be suited to detect experimentally generated PGE2 gradients by means of FRET-microscopy, indicating the potential to measure gradients of PGE2 within tissues. In addition to FRET-based imaging of prostanoid release, the sensor allowed not only for determination of PGE2 concentrations, but also proved to be capable of measuring ligand binding kinetics. The good signal-to-noise ratio at a commercial plate reader and the ability to directly determine ligand efficacy shows the obvious potential of this sensor interest for screening and characterization of novel ligands of the pharmacologically important human EP4 receptor. SIGNIFICANCE STATEMENT: The authors present a biosensor based on the prostaglandin E receptor subtype 4, which is well suited to measure extracellular prostaglandin E2 (PGE2) concentration with high temporal and spatial resolution. It can be used for the imaging of PGE2 levels and gradients by means of Foerster resonance energy transfer microscopy, and for determining PGE2 release of primary cells as well as for screening purposes in a plate reader setting.
Collapse
Affiliation(s)
- Michael Kurz
- Institutes for Pharmacology and Clinical Pharmacy (M.K., M.U., A.B., I.W., M.B.) and Pharmaceutical Chemistry (M.M.S., P.K.), Faculty of Pharmacy, Philipps-University Marburg, Marburg, Germany; Department of Pharmacology (J.S., N.W.), Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany; Department of Laser Medicine, Heinrich Heine University, Düsseldorf, Germany (H.L.); and LWL-Laboratory (H.L.), Düsseldorf, Germany
| | - Michaela Ulrich
- Institutes for Pharmacology and Clinical Pharmacy (M.K., M.U., A.B., I.W., M.B.) and Pharmaceutical Chemistry (M.M.S., P.K.), Faculty of Pharmacy, Philipps-University Marburg, Marburg, Germany; Department of Pharmacology (J.S., N.W.), Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany; Department of Laser Medicine, Heinrich Heine University, Düsseldorf, Germany (H.L.); and LWL-Laboratory (H.L.), Düsseldorf, Germany
| | - Alwina Bittner
- Institutes for Pharmacology and Clinical Pharmacy (M.K., M.U., A.B., I.W., M.B.) and Pharmaceutical Chemistry (M.M.S., P.K.), Faculty of Pharmacy, Philipps-University Marburg, Marburg, Germany; Department of Pharmacology (J.S., N.W.), Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany; Department of Laser Medicine, Heinrich Heine University, Düsseldorf, Germany (H.L.); and LWL-Laboratory (H.L.), Düsseldorf, Germany
| | - Magdalena Martina Scharf
- Institutes for Pharmacology and Clinical Pharmacy (M.K., M.U., A.B., I.W., M.B.) and Pharmaceutical Chemistry (M.M.S., P.K.), Faculty of Pharmacy, Philipps-University Marburg, Marburg, Germany; Department of Pharmacology (J.S., N.W.), Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany; Department of Laser Medicine, Heinrich Heine University, Düsseldorf, Germany (H.L.); and LWL-Laboratory (H.L.), Düsseldorf, Germany
| | - Jingchen Shao
- Institutes for Pharmacology and Clinical Pharmacy (M.K., M.U., A.B., I.W., M.B.) and Pharmaceutical Chemistry (M.M.S., P.K.), Faculty of Pharmacy, Philipps-University Marburg, Marburg, Germany; Department of Pharmacology (J.S., N.W.), Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany; Department of Laser Medicine, Heinrich Heine University, Düsseldorf, Germany (H.L.); and LWL-Laboratory (H.L.), Düsseldorf, Germany
| | - Imke Wallenstein
- Institutes for Pharmacology and Clinical Pharmacy (M.K., M.U., A.B., I.W., M.B.) and Pharmaceutical Chemistry (M.M.S., P.K.), Faculty of Pharmacy, Philipps-University Marburg, Marburg, Germany; Department of Pharmacology (J.S., N.W.), Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany; Department of Laser Medicine, Heinrich Heine University, Düsseldorf, Germany (H.L.); and LWL-Laboratory (H.L.), Düsseldorf, Germany
| | - Horst Lemoine
- Institutes for Pharmacology and Clinical Pharmacy (M.K., M.U., A.B., I.W., M.B.) and Pharmaceutical Chemistry (M.M.S., P.K.), Faculty of Pharmacy, Philipps-University Marburg, Marburg, Germany; Department of Pharmacology (J.S., N.W.), Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany; Department of Laser Medicine, Heinrich Heine University, Düsseldorf, Germany (H.L.); and LWL-Laboratory (H.L.), Düsseldorf, Germany
| | - Nina Wettschureck
- Institutes for Pharmacology and Clinical Pharmacy (M.K., M.U., A.B., I.W., M.B.) and Pharmaceutical Chemistry (M.M.S., P.K.), Faculty of Pharmacy, Philipps-University Marburg, Marburg, Germany; Department of Pharmacology (J.S., N.W.), Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany; Department of Laser Medicine, Heinrich Heine University, Düsseldorf, Germany (H.L.); and LWL-Laboratory (H.L.), Düsseldorf, Germany
| | - Peter Kolb
- Institutes for Pharmacology and Clinical Pharmacy (M.K., M.U., A.B., I.W., M.B.) and Pharmaceutical Chemistry (M.M.S., P.K.), Faculty of Pharmacy, Philipps-University Marburg, Marburg, Germany; Department of Pharmacology (J.S., N.W.), Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany; Department of Laser Medicine, Heinrich Heine University, Düsseldorf, Germany (H.L.); and LWL-Laboratory (H.L.), Düsseldorf, Germany
| | - Moritz Bünemann
- Institutes for Pharmacology and Clinical Pharmacy (M.K., M.U., A.B., I.W., M.B.) and Pharmaceutical Chemistry (M.M.S., P.K.), Faculty of Pharmacy, Philipps-University Marburg, Marburg, Germany; Department of Pharmacology (J.S., N.W.), Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany; Department of Laser Medicine, Heinrich Heine University, Düsseldorf, Germany (H.L.); and LWL-Laboratory (H.L.), Düsseldorf, Germany
| |
Collapse
|
10
|
Raz N, Eyal AM, Berneman Zeitouni D, Hen-Shoval D, Davidson EM, Danieli A, Tauber M, Ben-Chaim Y. SELECTED CANNABIS TERPENES SYNERGIZE WITH THC TO PRODUCE INCREASED CB1 RECEPTOR ACTIVATION. Biochem Pharmacol 2023; 212:115548. [PMID: 37084981 DOI: 10.1016/j.bcp.2023.115548] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 04/05/2023] [Accepted: 04/05/2023] [Indexed: 04/23/2023]
Abstract
The cannabis plant exerts its pharmaceutical activity primarily by the binding of cannabinoids to two G protein-coupled cannabinoid receptors, CB1 and CB2. The role that cannabis terpenes play in this activation has been considered and debated repeatedly, based on only limited experimental results. In the current study we used a controlled in-vitro heterologous expression system to quantify the activation of CB1 receptors by sixteen cannabis terpenes individually, by tetrahydrocannabinol (THC) alone and by THC-terpenes mixtures. The results demonstrate that all terpenes, when tested individually, activate CB1 receptors, at about 10-50% of the activation by THC alone. The combination of some of these terpenes with THC significantly increases the activity of the CB1 receptor, compared to THC alone. In some cases, several fold. Importantly, this amplification is evident at terpene to THC ratios similar to those in the cannabis plant, which reflect very low terpene concentrations. For some terpenes, the activation obtained by THC- terpene mixtures is notably greater than the sum of the activations by the individual components, suggesting a synergistic effect. Our results strongly support a modulatory effect of some of the terpenes on the interaction between THC and the CB1 receptor. As the most effective terpenes are not necessarily the most abundant ones in the cannabis plant, reaching "whole plant" or "full spectrum" composition is not necessarily an advantage. For enhanced therapeutic effects, desired compositions are attainable by enriching extracts with selected terpenes. These compositions adjust the treatment for various desired medicinal and personal needs.
Collapse
Affiliation(s)
- Noa Raz
- Bazelet Medical Cannabis Group, Or Akiva, Israel
| | | | | | | | - Elyad M Davidson
- Department of Anesthesiology, CCM and Pain Relief, Hadassah Hebrew University Hospital Jerusalem, Israel
| | - Aviel Danieli
- Department of Natural and Life Sciences, The Open University of Israel, Ra'anana, Israel
| | - Merav Tauber
- Department of Natural and Life Sciences, The Open University of Israel, Ra'anana, Israel
| | - Yair Ben-Chaim
- Department of Natural and Life Sciences, The Open University of Israel, Ra'anana, Israel.
| |
Collapse
|
11
|
Interaction kinetics between p115-RhoGEF and Gα 13 are determined by unique molecular interactions affecting agonist sensitivity. Commun Biol 2022; 5:1287. [PMID: 36434027 PMCID: PMC9700851 DOI: 10.1038/s42003-022-04224-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Accepted: 11/04/2022] [Indexed: 11/27/2022] Open
Abstract
The three RH-RhoGEFs (Guanine nucleotide exchange factors) p115-RhoGEF, LARG (leukemia-associated RhoGEF) and PDZ-RhoGEF link G-protein coupled receptors (GPCRs) with RhoA signaling through activation of Gα12/13. In order to find functional differences in signaling between the different RH-RhoGEFs we examined their interaction with Gα13 in high spatial and temporal resolution, utilizing a FRET-based single cell assay. We found that p115-RhoGEF interacts significantly shorter with Gα13 than LARG and PDZ-RhoGEF, while narrowing the structural basis for these differences down to a single amino acid in the rgRGS domain of p115-RhoGEF. The mutation of this amino acid led to an increased interaction time with Gα13 and an enhanced agonist sensitivity, comparable to LARG, while mutating the corresponding amino acid in Gα13 the same effect could be achieved. While the rgRGS domains of RH-RhoGEFs showed GAP (GTPase-activating protein) activity towards Gα13 in vitro, our approach suggests higher GAP activity of p115-RhoGEF in intact cells.
Collapse
|
12
|
David D, Bentulila Z, Tauber M, Ben-Chaim Y. G Protein-Coupled Receptors Regulated by Membrane Potential. Int J Mol Sci 2022; 23:ijms232213988. [PMID: 36430466 PMCID: PMC9696401 DOI: 10.3390/ijms232213988] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 11/09/2022] [Accepted: 11/10/2022] [Indexed: 11/16/2022] Open
Abstract
G protein-coupled receptors (GPCRs) are involved in a vast majority of signal transduction processes. Although they span the cell membrane, they have not been considered to be regulated by the membrane potential. Numerous studies over the last two decades have demonstrated that several GPCRs, including muscarinic, adrenergic, dopaminergic, and glutamatergic receptors, are voltage regulated. Following these observations, an effort was made to elucidate the molecular basis for this regulatory effect. In this review, we will describe the advances in understanding the voltage dependence of GPCRs, the suggested molecular mechanisms that underlie this phenomenon, and the possible physiological roles that it may play.
Collapse
|
13
|
Goldberger E, Tauber M, Ben-Chaim Y. Voltage dependence of the cannabinoid CB1 receptor. Front Pharmacol 2022; 13:1022275. [PMID: 36304142 PMCID: PMC9592857 DOI: 10.3389/fphar.2022.1022275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 09/21/2022] [Indexed: 11/13/2022] Open
Abstract
Cannabinoids produce their characteristic effects mainly by binding to two types of G-protein coupled receptors (GPCRs), the CB1 and CB2 cannabinoid receptors. The CB1 receptor is the main cannabinoid receptor in the central nervous system, and it participates in many brain functions. Recent studies showed that membrane potential may serve as a novel modulatory modality of many GPCRs. Here, we used Xenopus oocytes as an expression system to examine whether membrane potential modulates the activity of the CB1 receptor. We found that the potencies of the endocannabinoid 2-AG and the phytocannabinoid THC in activating the receptor are voltage dependent; depolarization enhanced the potency of these agonists and decreased their dissociation from the receptor. This voltage dependence appears to be agonist dependent as the potency of the endocannabinoid anandamide (AEA) was voltage independent. The finding of this agonist-specific modulatory factor for the CB1 receptor may contribute to our future understanding of various physiological functions mediated by the endocannabinoid system.
Collapse
|
14
|
Tauber M, Ben Chaim Y. The activity of the serotonergic 5-HT 1A receptor is modulated by voltage and sodium levels. J Biol Chem 2022; 298:101978. [PMID: 35469922 PMCID: PMC9136116 DOI: 10.1016/j.jbc.2022.101978] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 04/16/2022] [Accepted: 04/20/2022] [Indexed: 11/28/2022] Open
Abstract
G protein–coupled receptors are known to play a key role in many cellular signal transduction processes, including those mediating serotonergic signaling in the nervous system. Several factors have been shown to regulate the activity of these receptors, including membrane potential and the concentration of sodium ions. Whether voltage and sodium regulate the activity of serotonergic receptors is unknown. Here, we used Xenopus oocytes as an expression system to examine the effects of voltage and of sodium ions on the potency of one subtype of serotonin (5-hydroxytryptamine [5-HT]) receptor, the 5-HT1A receptor. We found that the potency of 5-HT in activating the receptor is voltage dependent and that it is higher at resting potential than under depolarized conditions. Furthermore, we found that removal of extracellular Na+ resulted in a decrease of 5-HT potency toward the 5-HT1A receptor and that a conserved aspartate in transmembrane domain 2 is crucial for this effect. Our results suggest that this allosteric effect of Na+ does not underlie the voltage dependence of this receptor. We propose that the characterization of modulatory factors that regulate this receptor may contribute to our future understanding of various physiological functions mediated by serotonergic transmission.
Collapse
Affiliation(s)
- Merav Tauber
- Department of Natural and Life Sciences, The Open University of Israel, Ra'anana, Israel
| | - Yair Ben Chaim
- Department of Natural and Life Sciences, The Open University of Israel, Ra'anana, Israel.
| |
Collapse
|
15
|
Rozenfeld E, Tauber M, Ben-Chaim Y, Parnas M. GPCR voltage dependence controls neuronal plasticity and behavior. Nat Commun 2021; 12:7252. [PMID: 34903750 PMCID: PMC8668892 DOI: 10.1038/s41467-021-27593-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2021] [Accepted: 11/29/2021] [Indexed: 12/25/2022] Open
Abstract
G-protein coupled receptors (GPCRs) play a paramount role in diverse brain functions. Almost 20 years ago, GPCR activity was shown to be regulated by membrane potential in vitro, but whether the voltage dependence of GPCRs contributes to neuronal coding and behavioral output under physiological conditions in vivo has never been demonstrated. Here we show that muscarinic GPCR mediated neuronal potentiation in vivo is voltage dependent. This voltage dependent potentiation is abolished in mutant animals expressing a voltage independent receptor. Depolarization alone, without a muscarinic agonist, results in a nicotinic ionotropic receptor potentiation that is mediated by muscarinic receptor voltage dependency. Finally, muscarinic receptor voltage independence causes a strong behavioral effect of increased odor habituation. Together, this study identifies a physiological role for the voltage dependency of GPCRs by demonstrating crucial involvement of GPCR voltage dependence in neuronal plasticity and behavior. Thus, this study suggests that GPCR voltage dependency plays a role in many diverse neuronal functions including learning and memory.
Collapse
Affiliation(s)
- Eyal Rozenfeld
- Department of Physiology and Pharmacology, Sackler School of Medicine, Tel Aviv University, Tel Aviv, 69978, Israel
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, 69978, Israel
| | - Merav Tauber
- Department of Natural and Life Sciences, The Open University of Israel, Ra'anana, 43107, Israel
| | - Yair Ben-Chaim
- Department of Natural and Life Sciences, The Open University of Israel, Ra'anana, 43107, Israel
| | - Moshe Parnas
- Department of Physiology and Pharmacology, Sackler School of Medicine, Tel Aviv University, Tel Aviv, 69978, Israel.
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, 69978, Israel.
| |
Collapse
|
16
|
García-Carlos CA, Camargo-Loaiza JA, García-Villa D, López-Cervantes JG, Domínguez-Avila JA, González-Aguilar GA, Astiazaran-Garcia H, Montiel-Herrera M. Angiotensin II, ATP and high extracellular potassium induced intracellular calcium responses in primary rat brain endothelial cell cultures. Cell Biochem Funct 2021; 39:688-698. [PMID: 33821520 DOI: 10.1002/cbf.3635] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 03/16/2021] [Accepted: 03/23/2021] [Indexed: 01/02/2023]
Abstract
The meninges shield the nervous system from diverse, rather harmful stimuli and pathogens from the periphery. This tissue is composed of brain endothelial cells (BECs) that express diverse ion channels and chemical-transmitter receptors also expressed by neurons and glial cells to communicate with each other. However, information about the effects of ATP and angiotensin II on BECs is scarce, despite their essential roles in blood physiology. This work investigated in vitro if BECs from the meninges from rat forebrain respond to ATP, angiotensin II and high extracellular potassium, with intracellular calcium mobilizations and its second messenger-associated pathways. We found that in primary BEC cultures, both ATP and angiotensin II produced intracellular calcium responses linked to the activation of inositol trisphosphate receptors and ryanodine receptors, which led to calcium release from intracellular stores. We also used RT-PCR to explore what potassium channel subunits are expressed by primary BEC cultures and freshly isolated meningeal tissue, and which might be linked to the observed effects. We found that BECs mainly expressed the inward rectifier potassium channel subunits Kir1.1, Kir3.3, Kir 4.1 and Kir6.2. This study contributes to the understanding of the functions elicited by ATP and angiotensin II in BECs from rat meninges. SIGNIFICANCE OF THE STUDY: Brain endothelial cells (BECs) express diverse ion channels and membrane receptors, which they might use to communicate with neurons and glia. This work investigated in vitro, if BECs from the rat forebrain respond to angiotensin II and ATP with intracellular calcium mobilizations. We found that these cells did respond to said substances with intracellular calcium mobilizations linked to inositol trisphosphate and ryanodine receptor activation, which led to calcium release from intracellular stores. These findings are important because they might uncover routes of active communication between brain cells and endothelial cells.
Collapse
Affiliation(s)
| | | | - Denisse García-Villa
- Departamento de Medicina y Ciencias de la Salud, Universidad de Sonora, Hermosillo, Sonora, Mexico
| | | | - J Abraham Domínguez-Avila
- Cátedras CONACYT-Centro de Investigación en Alimentación y Desarrollo A.C., Hermosillo, Sonora, Mexico
| | - Gustavo A González-Aguilar
- Laboratorio de Antioxidantes y Alimentos Funcinales, Centro de Investigación en Alimentación y Desarrollo A.C., Hermosillo, Sonora, Mexico
| | - Humberto Astiazaran-Garcia
- Laboratorio de Patología Experimental, Centro de Investigación en Alimentación y Desarrollo A.C., Hermosillo, Sonora, Mexico
| | | |
Collapse
|
17
|
Ågren R, Sahlholm K. Voltage-Dependent Dopamine Potency at D 1-Like Dopamine Receptors. Front Pharmacol 2020; 11:581151. [PMID: 33117177 PMCID: PMC7577048 DOI: 10.3389/fphar.2020.581151] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Accepted: 09/16/2020] [Indexed: 01/17/2023] Open
Abstract
In recent years, transmembrane voltage has been found to modify agonist potencies at several G protein-coupled receptors (GPCRs). Whereas the voltage sensitivities of the Gαi/o-coupled dopamine D2-like receptors (D2R, D3R, D4R) have previously been investigated, the putative impact of transmembrane voltage on agonist potency at the mainly Gαs/olf-coupled dopamine D1-like receptors (D1R, D5R) has hitherto not been reported. Here, we assayed the potency of dopamine in activating G protein-coupled inward rectifier potassium (GIRK) channels co-expressed with D1R and D5R in Xenopus oocytes, at -80 mV and at 0 mV. Furthermore, GIRK response deactivation rates upon dopamine washout were measured to estimate dopamine dissociation rate (koff) constants. Depolarization from -80 to 0 mV was found to reduce dopamine potency by about 7-fold at both D1R and D5R. This potency reduction was accompanied by an increase in estimated dopamine koffs at both receptors. While the GIRK response elicited via D1R was insensitive to pertussis toxin (PTX), the response evoked via D5R was reduced by 64% (-80 mV) and 71% (0 mV) in the presence of PTX. Injection of oocytes with Gαs antisense oligonucleotide inhibited the D1R-mediated response by 62% (-80 mV) and 76% (0 mV) and abolished the D5R response when combined with PTX. Our results suggest that depolarization decreases dopamine affinity at D1R and D5R. The voltage-dependent affinities of dopamine at D1R and D5R may be relevant to the functions of these receptors in learning and memory.
Collapse
Affiliation(s)
- Richard Ågren
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Kristoffer Sahlholm
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden.,Department of Integrative Medical Biology, Umeå University, Umeå, Sweden.,Wallenberg Centre for Molecular Medicine, Umeå University, Umeå, Sweden
| |
Collapse
|