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Ma C, Luo Y, Zhang C, Cheng C, Hua N, Liu X, Wu J, Qin L, Yu P, Luo J, Yang F, Jiang LH, Zhang G, Yang W. Evolutionary trajectory of TRPM2 channel activation by adenosine diphosphate ribose and calcium. Sci Bull (Beijing) 2024:S2095-9273(24)00301-3. [PMID: 38734586 DOI: 10.1016/j.scib.2024.04.052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 02/07/2024] [Accepted: 04/19/2024] [Indexed: 05/13/2024]
Abstract
Ion channel activation upon ligand gating triggers a myriad of biological events and, therefore, evolution of ligand gating mechanism is of fundamental importance. TRPM2, a typical ancient ion channel, is activated by adenosine diphosphate ribose (ADPR) and calcium and its activation has evolved from a simple mode in invertebrates to a more complex one in vertebrates, but the evolutionary process is still unknown. Molecular evolutionary analysis of TRPM2s from more than 280 different animal species has revealed that, the C-terminal NUDT9-H domain has evolved from an enzyme to a ligand binding site for activation, while the N-terminal MHR domain maintains a conserved ligand binding site. Calcium gating pattern has also evolved, from one Ca2+-binding site as in sea anemones to three sites as in human. Importantly, we identified a new group represented by olTRPM2, which has a novel gating mode and fills the missing link of the channel gating evolution. We conclude that the TRPM2 ligand binding or activation mode evolved through at least three identifiable stages in the past billion years from simple to complicated and coordinated. Such findings benefit the evolutionary investigations of other channels and proteins.
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Affiliation(s)
- Cheng Ma
- Department of Biophysics and Department of Neurosurgery, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China; Protein Facility, Core Facilities, Zhejiang University School of Medicine, Zhejiang University, Hangzhou 310058, China
| | - Yanping Luo
- Department of Biophysics and Department of Neurosurgery, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Congyi Zhang
- Department of Biophysics and Department of Neurosurgery, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Cheng Cheng
- Department of Biophysics and Department of Neurosurgery, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Ning Hua
- Department of Biophysics and Department of Neurosurgery, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Xiaocao Liu
- Department of Biophysics and Department of Neurosurgery, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Jianan Wu
- Department of Biophysics and Department of Neurosurgery, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Luying Qin
- Department of Biophysics and Department of Neurosurgery, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Peilin Yu
- Department of Toxicology, and Department of Medical Oncology of The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Jianhong Luo
- Department of Neurobiology, Affiliated Mental Health Center, College of Brain Science and Brain Medicine, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Fan Yang
- Department of Biophysics, and Kidney Disease Center of The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Lin-Hua Jiang
- Sino-UK Joint Laboratory of Brain Function and Injury of Henan Province, and Department of Physiology and Pathophysiology, Xinxiang Medical University, Xinxiang 453004, China; Henan Collaborative Innovation Center of Prevention and Treatment of Mental Disorder, The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang 453004, China
| | - Guojie Zhang
- Evolutionary & Organismal Biology Research Center, School of Medicine, Zhejiang University, Hangzhou 310058, China
| | - Wei Yang
- Department of Biophysics and Department of Neurosurgery, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China; GuiZhou University Medical College, Guiyang 550025, China.
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Chubanov V, Köttgen M, Touyz RM, Gudermann T. TRPM channels in health and disease. Nat Rev Nephrol 2024; 20:175-187. [PMID: 37853091 DOI: 10.1038/s41581-023-00777-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/25/2023] [Indexed: 10/20/2023]
Abstract
Different cell channels and transporters tightly regulate cytoplasmic levels and the intraorganelle distribution of cations. Perturbations in these processes lead to human diseases that are frequently associated with kidney impairment. The family of melastatin-related transient receptor potential (TRPM) channels, which has eight members in mammals (TRPM1-TRPM8), includes ion channels that are highly permeable to divalent cations, such as Ca2+, Mg2+ and Zn2+ (TRPM1, TRPM3, TRPM6 and TRPM7), non-selective cation channels (TRPM2 and TRPM8) and monovalent cation-selective channels (TRPM4 and TRPM5). Three family members contain an enzymatic protein moiety: TRPM6 and TRPM7 are fused to α-kinase domains, whereas TRPM2 is linked to an ADP-ribose-binding NUDT9 homology domain. TRPM channels also function as crucial cellular sensors involved in many physiological processes, including mineral homeostasis, blood pressure, cardiac rhythm and immunity, as well as photoreception, taste reception and thermoreception. TRPM channels are abundantly expressed in the kidney. Mutations in TRPM genes cause several inherited human diseases, and preclinical studies in animal models of human disease have highlighted TRPM channels as promising new therapeutic targets. Here, we provide an overview of this rapidly evolving research area and delineate the emerging role of TRPM channels in kidney pathophysiology.
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Affiliation(s)
- Vladimir Chubanov
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany.
| | - Michael Köttgen
- Renal Division, Department of Medicine, Medical Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany
- CIBSS - Centre for Integrative Biological Signalling Studies, Freiburg, Germany
| | - Rhian M Touyz
- Research Institute of McGill University Health Centre, McGill University, Montreal, Quebec, Canada
| | - Thomas Gudermann
- Walther-Straub Institute of Pharmacology and Toxicology, LMU Munich, Munich, Germany.
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3
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Bartók Á, Csanády L. TRPM2 - An adjustable thermostat. Cell Calcium 2024; 118:102850. [PMID: 38237549 DOI: 10.1016/j.ceca.2024.102850] [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: 12/08/2023] [Revised: 01/10/2024] [Accepted: 01/10/2024] [Indexed: 02/27/2024]
Abstract
The Transient Receptor Potential Melastatin 2 (TRPM2) channel is a homotetrameric ligand-gated cation channel opened by the binding of cytosolic ADP ribose (ADPR) and Ca2+. In addition, strong temperature dependence of its activity has lately become a center of attention for both physiological and biophysical studies. TRPM2 temperature sensitivity has been affirmed to play a role in central and peripheral thermosensation, pancreatic insulin secretion, and immune cell function. On the other hand, a number of different underlying mechanisms have been proposed from studies in intact cells. This review summarizes available information on TRPM2 temperature sensitivity, with a focus on recent mechanistic insight obtained in a cell-free system. Those biophysical results outline TRPM2 as a channel with an intrinsically endothermic opening transition, a temperature threshold strongly modulated by cytosolic agonist concentrations, and a response steepness greatly enhanced through a positive feedback loop generated by Ca2+ influx through the channel's pore. Complex observations in intact cells and apparent discrepancies between studies using in vivo and in vitro models are discussed and interpreted in light of the intrinsic biophysical properties of the channel protein.
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Affiliation(s)
- Ádám Bartók
- Department of Biochemistry, Semmelweis University, Budapest, Hungary; HCEMM-SE Molecular Channelopathies Research Group, Budapest, Hungary; HUN-REN-SE Ion Channel Research Group, Budapest, Hungary
| | - László Csanády
- Department of Biochemistry, Semmelweis University, Budapest, Hungary; HCEMM-SE Molecular Channelopathies Research Group, Budapest, Hungary; HUN-REN-SE Ion Channel Research Group, Budapest, Hungary.
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4
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Hu F, Lin C. TRPM2 knockdown attenuates myocardial apoptosis and promotes autophagy in HFD/STZ-induced diabetic mice via regulating the MEK/ERK and mTORC1 signaling pathway. Mol Cell Biochem 2024:10.1007/s11010-024-04926-0. [PMID: 38308007 DOI: 10.1007/s11010-024-04926-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 01/05/2024] [Indexed: 02/04/2024]
Abstract
Diabetic cardiomyopathy (DCM) is a major complication of diabetes. Transient receptor potential melastatin 2 (TRPM2) activity increases in diabetic oxidative stress state, and it is involved in myocardial damage and repair. We explore the protective effect of TRPM2 knockdown on the progression of DCM. A type 2 diabetes animal model was established in C57BL/6N mice by long-term high-fat diet (HFD) feeding combined with a single injection of 100-mg/kg streptozotocin (STZ). Genetic knockdown of TRPM2 in heart was accomplished by the intravenous injection via the tail vein of adeno-associated virus type 9 carrying TRPM2 shRNA. Neonatal rat ventricular myocytes was exposed to 45 mM of high-glucose (HG) stimulation for 72 h in vitro to mimic the in vivo conditions. Western blot, real-time quantitative PCR (RT-qPCR), immunohistochemistry and fluorescence, electron, CCK-8, and flow cytometry were used to evaluate the phenotype of cardiac inflammation, fibrosis, apoptosis, and autophagy. Mice with HFD/STZ-induced diabetes exhibited systolic and diastolic dysfunction, as demonstrated by increased myocardial apoptosis and autophagy inhibition in the heart. Compared to control group, the protein expression of TRPM2, bax, cleaved caspase-3, and P62 was significantly elevated, and the protein expression of bcl-2 and LC3-II was significantly decreased in the myocardial tissues of the HFD/STZ-induced diabetes group. Knockdown of TRPM2 significantly reversed the HFD/STZ-induced myocardial apoptosis and autophagy inhibition. TRPM2 silencing attenuated HG-induced apoptosis and autophagy inhibition in primary cardiomyocytes via regulating the MEK/ERK mTORC1 signaling pathway. TRPM2 knockdown attenuates hyperglycemia-induced myocardial apoptosis and promotes autophagy in HFD/STZ-induced diabetic mice or HG-stimulated cardiomyocytes via regulating the MEK/ERK and mTORC1 signaling pathway.
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Affiliation(s)
- Feng Hu
- Department of Cardiology, Fujian Medical University Union Hospital, Fuzhou, 350001, Fujian, China.
| | - Chaoyang Lin
- Department of Cardiology, Fujian Medical University Union Hospital, Fuzhou, 350001, Fujian, China
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Rios FJ, Sarafian RD, Camargo LL, Montezano AC, Touyz RM. Recent Advances in Understanding the Mechanistic Role of Transient Receptor Potential Ion Channels in Patients With Hypertension. Can J Cardiol 2023; 39:1859-1873. [PMID: 37865227 DOI: 10.1016/j.cjca.2023.10.009] [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: 10/05/2023] [Revised: 10/17/2023] [Accepted: 10/17/2023] [Indexed: 10/23/2023] Open
Abstract
The transient receptor potential (TRP) channel superfamily is a group of nonselective cation channels that function as cellular sensors for a wide range of physical, chemical, and environmental stimuli. According to sequence homology, TRP channels are categorized into 6 subfamilies: TRP canonical, TRP vanilloid, TRP melastatin, TRP ankyrin, TRP mucolipin, and TRP polycystin. They are widely expressed in different cell types and tissues and have essential roles in various physiological and pathological processes by regulating the concentration of ions (Ca2+, Mg2+, Na+, and K+) and influencing intracellular signalling pathways. Human data and experimental models indicate the importance of TRP channels in vascular homeostasis and hypertension. Furthermore, TRP channels have emerged as key players in oxidative stress and inflammation, important in the pathophysiology of cardiovascular diseases, including hypertension. In this review, we present an overview of the TRP channels with a focus on their role in hypertension. In particular, we highlight mechanisms activated by TRP channels in vascular smooth muscle and endothelial cells and discuss their contribution to processes underlying vascular dysfunction in hypertension.
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Affiliation(s)
- Francisco J Rios
- Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada.
| | - Raquel D Sarafian
- Institute of Biosciences, Department of Genetics and Evolutionary Biology, University of Sao Paulo, Sao Paulo, Brazil
| | - Livia L Camargo
- Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada
| | - Augusto C Montezano
- Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada
| | - Rhian M Touyz
- Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada; Department of Medicine, McGill University, Montreal, Quebec, Canada.
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Maliougina M, El Hiani Y. TRPM2: bridging calcium and ROS signaling pathways-implications for human diseases. Front Physiol 2023; 14:1217828. [PMID: 37576339 PMCID: PMC10412822 DOI: 10.3389/fphys.2023.1217828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Accepted: 06/26/2023] [Indexed: 08/15/2023] Open
Abstract
TRPM2 is a versatile and essential signaling molecule that plays diverse roles in Ca2+ homeostasis and oxidative stress signaling, with implications in various diseases. Research evidence has shown that TRPM2 is a promising therapeutic target. However, the decision of whether to activate or inhibit TRPM2 function depends on the context and specific disease. A deeper understanding of the molecular mechanisms governing TRPM2 activation and regulation could pave the way for the development of innovative therapeutics targeting TRPM2 to treat a broad range of diseases. In this review, we examine the structural and biophysical details of TRPM2, its involvement in neurological and cardiovascular diseases, and its role in inflammation and immune system function. In addition, we provide a comprehensive overview of the current knowledge of TRPM2 signaling pathways in cancer, including its functions in bioenergetics, oxidant defense, autophagy, and response to anticancer drugs.
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Affiliation(s)
| | - Yassine El Hiani
- Department of Physiology and Biophysics, Dalhousie University Faculty of Medicine, Halifax, NS, Canada
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Yazğan B, Yazğan Y, Nazıroğlu M. Alpha-lipoic acid modulates the diabetes mellitus-mediated neuropathic pain via inhibition of the TRPV1 channel, apoptosis, and oxidative stress in rats. J Bioenerg Biomembr 2023:10.1007/s10863-023-09971-w. [PMID: 37357235 DOI: 10.1007/s10863-023-09971-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Accepted: 06/16/2023] [Indexed: 06/27/2023]
Abstract
Diabetes mellitus (DM) is a chronic syndrome involving neuropathic pain. Increased oxidative stress in DM is assumed to increase free reactive oxygen radicals (ROS) and causes diabetic damage. The sciatic nerve (ScN) and dorsal root ganglion (DRG) both contain high levels of the TRPV1 channel, which is triggered by capsaicin and ROSs and results in increased Ca2+ entry into the neurons. Alpha-lipoic acid (ALA) is considered an important part of the antioxidant system. To better characterize the protective effects of ALA on the DM-induced neuronal through TRPV1 modulation, we investigated the role of ALA on DM-induced neuropathic pain, oxidative ScN, and DRG damage in diabetic rats. Forty adult Wistar albino female rats were divided into four groups as control, ALA (50 mg/kg for 14 days), streptozotocin (STZ and 45 mg/kg and single dose), and STZ + ALA. Rats were used for the pain tests. After obtaining the DRGs and ScN, they were used for plate reader, patch-clamp, and laser confocal microscope analyses. We observed the modulator role of ALA on the thresholds of mechanical withdrawal pain (von Frey test) and hot sensitivity pain (hot plate test) in the STZ + ALA group. The treatment of ALA decreased STZ-induced increase of TRPV1 current densities, intracellular free Ca2+ concentrations (Fura-2 and Fluo - 3/AM), ROS, caspase 3, caspase 9, mitochondrial membrane potential, and apoptosis values in the ScN and DRG neurons, although its treatment induced the increase of cell viability and body weight gain. The treatment of ALA acted a neuroprotective role on the TRPV1 channel stimulation-mediated Ca2+ influx, neuropathic pain, and neuronal damage in diabetic rats. The neuroprotective role of ALA treatment can be explained by its modulating the TRPV1 channel activity, intracellular Ca2+ increase-induced oxidative stress, and apoptosis.
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Affiliation(s)
- Betül Yazğan
- Department of Physiology, Medical Faculty, Kastamonu University, Kastamonu, Türkiye, Turkey
| | - Yener Yazğan
- Department of Biophysics, Medical Faculty, Kastamonu University, Kastamonu, Türkiye, Turkey
| | - Mustafa Nazıroğlu
- Neuroscience Research Center, Suleyman Demirel University, Isparta, Türkiye, Turkey.
- Department of Neuroscience, Health Science Institute, Suleyman Demirel University, Isparta, Türkiye, Turkey.
- Departments of Biophysics and Neuroscience, Faculty of Medicine, Suleyman Demirel University, Isparta, Türkiye, Turkey.
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Aydın B, Nazıroğlu M. Involvement of TRPM7 Channel on the Induction of Diabetic Neuropathic Pain in Mice: Protective Role of Selenium and Curcumin. Biol Trace Elem Res 2023; 201:2377-2395. [PMID: 36567422 DOI: 10.1007/s12011-022-03518-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 12/05/2022] [Indexed: 12/26/2022]
Abstract
Excessive levels of the mitochondrial reactive oxygen radical (mitSOX) and Ca2+ influx were found to cause neuropathic pain in patients with diabetes mellitus (DM). Naltriben (NLT) and mitSOX activate the transient receptor (TRP) melastatin 7 (TRPM7) channel, but antioxidants and carvacrol inhibit it. Selenium (Se) and curcumin (CRC) have been thoroughly studied for their modulator effects on streptozotocin (STZ)-induced neuropathic pain, apoptosis, and oxidative stress through the blockage of TRP channels in dorsal root ganglion (DRG) neurons. It has not yet been fully understood how Se and CRC protect against STZ-induced neuropathic pain by modulating TRPM7. Here, we assessed how Se and CRC affected the Ca2+ influx, mitSOX-mediated oxidative damage, and apoptosis in the DRGs of mice through modifying TRPM7 activity. Seven groups (control, Se, CRC, STZ, STZ + Se, STZ + CRC, and STZ + Se + CRC) were induced from the 56 male mice. We observed that the STZ-induced stimulation of TRPM7 increased mechanical neuropathic pain (von Frey), thermal neuropathic pain (hot plate), cytosolic Ca2+, TRPM7 current density, TRPM7 expression, lipid peroxidation, mitSOX, cytosolic ROS, apoptosis, caspase-3, caspase-8, and caspase-9 concentrations, whereas Se and CRC therapies diminished the alterations. The STZ-mediated decreases of DRG viability, brain glutathione, glutathione peroxidase, vitamin A, and vitamin E concentrations were also upregulated in the treatment groups by the therapies. These findings collectively imply that an imbalance of neuropathic pain, oxidative neurotoxicity, and apoptosis in the mice is caused by the STZ-mediated activation of TRPM7. However, the downregulation of TRPM7 activity caused by the injections of Se and CRC reduced the neurotoxicity and apoptosis.
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Affiliation(s)
- Bünyamin Aydın
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Faculty of Medicine, Kutahya Health Sciences University, Kutahya Evliya Çelebi Training and Research Hospital, TR-64100, Kutahya, Turkey
| | - Mustafa Nazıroğlu
- Neuroscience Research Center (NOROBAM), Suleyman Demirel University, TR-32260, Isparta, Turkey.
- Drug Discovery Unit, Analyses, Innov, BSN Health, Org., Agricul., Ltd, Consult, TR-32260, Isparta, Turkey.
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Ciaglia T, Vestuto V, Bertamino A, González-Muñiz R, Gómez-Monterrey I. On the modulation of TRPM channels: Current perspectives and anticancer therapeutic implications. Front Oncol 2023; 12:1065935. [PMID: 36844925 PMCID: PMC9948629 DOI: 10.3389/fonc.2022.1065935] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Accepted: 12/15/2022] [Indexed: 02/11/2023] Open
Abstract
The transient melastatin receptor potential (TRPM) ion channel subfamily functions as cellular sensors and transducers of critical biological signal pathways by regulating ion homeostasis. Some members of TRPM have been cloned from cancerous tissues, and their abnormal expressions in various solid malignancies have been correlated with cancer cell growth, survival, or death. Recent evidence also highlights the mechanisms underlying the role of TRPMs in tumor epithelial-mesenchymal transition (EMT), autophagy, and cancer metabolic reprogramming. These implications support TRPM channels as potential molecular targets and their modulation as an innovative therapeutic approach against cancer. Here, we discuss the general characteristics of the different TRPMs, focusing on current knowledge about the connection between TRPM channels and critical features of cancer. We also cover TRPM modulators used as pharmaceutical tools in biological trials and an indication of the only clinical trial with a TRPM modulator about cancer. To conclude, the authors describe the prospects for TRPM channels in oncology.
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Affiliation(s)
- Tania Ciaglia
- Dipartimento di Farmacia (DIFARMA), Università degli Studi di Salerno, Fisciano, Italy
| | - Vincenzo Vestuto
- Dipartimento di Farmacia (DIFARMA), Università degli Studi di Salerno, Fisciano, Italy
| | - Alessia Bertamino
- Dipartimento di Farmacia (DIFARMA), Università degli Studi di Salerno, Fisciano, Italy
| | - Rosario González-Muñiz
- Departamento de Biomiméticos, Instituto de Química Médica, Madrid, Spain,*Correspondence: Isabel Gómez-Monterrey, ; Rosario González-Muñiz,
| | - Isabel Gómez-Monterrey
- Dipartimento di Farmacia, Università degli Studi di Napoli “Federico II”, Naples, Italy,*Correspondence: Isabel Gómez-Monterrey, ; Rosario González-Muñiz,
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Rached G, Saliba Y, Maddah D, Hajal J, Smayra V, Bakhos J, Groschner K, Birnbaumer L, Fares N. TRPC3 Regulates Islet Beta-Cell Insulin Secretion. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2204846. [PMID: 36642838 PMCID: PMC9951314 DOI: 10.1002/advs.202204846] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 11/18/2022] [Indexed: 06/17/2023]
Abstract
Insulin release is tightly controlled by glucose-stimulated calcium (GSCa) through hitherto equivocal pathways. This study investigates TRPC3, a non-selective cation channel, as a critical regulator of insulin secretion and glucose control. TRPC3's involvement in glucose-stimulated insulin secretion (GSIS) is studied in human and animal islets. TRPC3-dependent in vivo insulin secretion is investigated using pharmacological tools and Trpc3-/- mice. TRPC3's involvement in islet glucose uptake and GSCa is explored using fluorescent glucose analogue 2-[N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl) amino]-2-deoxy-D-glucose and calcium imaging. TRPC3 modulation by a small-molecule activator, GSK1702934A, is evaluated in type 2 diabetic mice. TRPC3 is functionally expressed in human and mouse islet beta cells. TRPC3-controlled insulin secretion is KATP -independent and primarily mediated by diacylglycerol channel regulation of the cytosolic calcium oscillations following glucose stimulation. Conversely, glucose uptake in islets is independent of TRPC3. TRPC3 pharmacologic inhibition and knockout in mice lead to defective insulin secretion and glucose intolerance. Subsequently, TRPC3 activation through targeted small-molecule enhances insulin secretion and alleviates diabetes hallmarks in animals. This study imputes a function for TRPC3 at the onset of GSIS. These insights strengthen one's knowledge of insulin secretion physiology and set forth the TRPC3 channel as an appealing candidate for drug development in the treatment of diabetes.
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Affiliation(s)
- Gaëlle Rached
- Physiology and Pathophysiology Research LaboratoryPole of Technology and HealthFaculty of MedicineSaint Joseph University of BeirutPOBox. 17‐5208 ‐ Mar MikhaëlBeirut1104 2020Lebanon
| | - Youakim Saliba
- Physiology and Pathophysiology Research LaboratoryPole of Technology and HealthFaculty of MedicineSaint Joseph University of BeirutPOBox. 17‐5208 ‐ Mar MikhaëlBeirut1104 2020Lebanon
| | - Dina Maddah
- Physiology and Pathophysiology Research LaboratoryPole of Technology and HealthFaculty of MedicineSaint Joseph University of BeirutPOBox. 17‐5208 ‐ Mar MikhaëlBeirut1104 2020Lebanon
| | - Joelle Hajal
- Physiology and Pathophysiology Research LaboratoryPole of Technology and HealthFaculty of MedicineSaint Joseph University of BeirutPOBox. 17‐5208 ‐ Mar MikhaëlBeirut1104 2020Lebanon
| | - Viviane Smayra
- Faculty of MedicineSaint Joseph UniversitySaint Joseph University of BeirutPOBox. 17‐5208 ‐ Mar MikhaëlBeirut1104 2020Lebanon
| | - Jules‐Joel Bakhos
- Physiology and Pathophysiology Research LaboratoryPole of Technology and HealthFaculty of MedicineSaint Joseph University of BeirutPOBox. 17‐5208 ‐ Mar MikhaëlBeirut1104 2020Lebanon
| | - Klaus Groschner
- Gottfried‐Schatz‐Research‐Centre‐BiophysicsMedical University of GrazGraz8010Austria
| | - Lutz Birnbaumer
- School of Medical SciencesInstitute of Biomedical Research (BIOMED)Catholic University of ArgentinaBuenos AiresC1107AAZArgentina
- Signal Transduction LaboratoryNational Institute of Environmental Health SciencesResearch Triangle ParkDurhamNCC1107AAZUSA
| | - Nassim Fares
- Physiology and Pathophysiology Research LaboratoryPole of Technology and HealthFaculty of MedicineSaint Joseph University of BeirutPOBox. 17‐5208 ‐ Mar MikhaëlBeirut1104 2020Lebanon
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The ABA/LANCL Hormone/Receptor System in the Control of Glycemia, of Cardiomyocyte Energy Metabolism, and in Neuroprotection: A New Ally in the Treatment of Diabetes Mellitus? Int J Mol Sci 2023; 24:ijms24021199. [PMID: 36674711 PMCID: PMC9863406 DOI: 10.3390/ijms24021199] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 01/03/2023] [Accepted: 01/04/2023] [Indexed: 01/11/2023] Open
Abstract
Abscisic acid (ABA), long known as a plant stress hormone, is present and functionally active in organisms other than those pertaining to the land plant kingdom, including cyanobacteria, fungi, algae, protozoan parasites, lower Metazoa, and mammals. The ancient, cross-kingdom role of this stress hormone allows ABA and its signaling pathway to control cell responses to environmental stimuli in diverse organisms such as marine sponges, higher plants, and humans. Recent advances in our knowledge about the physiological role of ABA and of its mammalian receptors in the control of energy metabolism and mitochondrial function in myocytes, adipocytes, and neuronal cells allow us to foresee therapeutic applications for ABA in the fields of pre-diabetes, diabetes, and cardio- and neuro-protection. Vegetal extracts titrated in their ABA content have shown both efficacy and tolerability in preliminary clinical studies. As the prevalence of glucose intolerance, diabetes, and cardiovascular and neurodegenerative diseases is steadily increasing in both industrialized and rapidly developing countries, new and cost-efficient therapeutics to combat these ailments are much needed to ensure disease-free aging for the current and future working generations.
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Kashio M, Masubuchi S, Tominaga M. Protein kinase C-mediated phosphorylation of transient receptor potential melastatin type 2 Thr738 counteracts the effect of cytosolic Ca 2+ and elevates the temperature threshold. J Physiol 2022; 600:4287-4302. [PMID: 36042566 PMCID: PMC9826287 DOI: 10.1113/jp283350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Accepted: 08/26/2022] [Indexed: 01/11/2023] Open
Abstract
The transient receptor potential melastatin type 2 (TRPM2) channel is a non-selective cation channel that has high Ca2+ permeability. TRPM2 is sensitive to warm temperatures and is expressed in cells and tissues that are maintained at core body temperature. TRPM2 activity is also regulated by endogenous factors including redox signalling, cytosolic Ca2+ and adenosine diphosphate ribose. As a result of its wide expression and function at core body temperature, these endogenous factors could regulate TRPM2 activity at body temperature under physiological and pathophysiological conditions. We previously reported that cellular redox signalling can lower TRPM2 temperature thresholds, although the mechanism that regulates these thresholds is unclear. Here, we used biochemical and electrophysiological techniques to explore another regulatory mechanism for TRPM2 temperature thresholds that is mediated by TRPM2 phosphorylation. Our results show that: (1) the temperature threshold for TRPM2 activation is lowered by cytosolic Ca2+ ; (2) protein kinase C-mediated phosphorylation of TRPM2 counteracts the effect of cytosolic Ca2+ ; and (3) Thr738 in mouse TRPM2 that lies near the Ca2+ binding site in the cytosolic cleft of the transmembrane domain is a potential phosphorylation site that may be involved in phosphorylation-mediated elevation of TRPM2 thresholds. These findings provide structure-based evidence to understand how temperature thresholds of thermo-sensitive TRP channels (thermo-TRPs) are determined and regulated. KEY POINTS: The transient receptor potential melastatin type 2 (TRPM2) ion channel is temperature-sensitive and Ca2+ -permeable. Endogenous factors and pathways such as redox signalling can regulate TRPM2 activity at body temperature under physiological and pathophysiological conditions. In the present study, we report the novel finding that cytosolic Ca2+ lowers the temperature threshold for TRPM2 activation in a concentration-dependent manner. Protein kinase C-mediated phosphorylation of TRPM2 at amino acid Thr782 elevates the temperature threshold for activation by counteracting the effects of cytosolic Ca2+ . These findings provide structure-based evidence to understand how temperature thresholds of thermo-sensitive TRP channels are determined and regulated.
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Affiliation(s)
- Makiko Kashio
- Division of Cell SignalingNational Institute for Physiological SciencesNational Institutes for Natural SciencesOkazakiAichiJapan
| | - Satoru Masubuchi
- Department of PhysiologyAichi Medical UniversityNagakuteAichiJapan
| | - Makoto Tominaga
- Division of Cell SignalingNational Institute for Physiological SciencesNational Institutes for Natural SciencesOkazakiAichiJapan,Thermal Biology GroupExploratory Research Center on Life and Living Systems (ExCELLS)National Institutes of Natural SciencesOkazakiAichiJapan
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13
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Daldal H, Nazıroğlu M. Selenium and Resveratrol Attenuated Diabetes Mellitus-Mediated Oxidative Retinopathy and Apoptosis via the Modulation of TRPM2 Activity in Mice. Biol Trace Elem Res 2022; 200:2283-2297. [PMID: 35384580 DOI: 10.1007/s12011-022-03203-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Accepted: 03/11/2022] [Indexed: 01/14/2023]
Abstract
Diabetes mellitus induces optic nerve injury via the excessive generation of mitochondria reactive free oxygen radical (mitROS). TRPM2 channel is activated by mitROS, although it is inhibited by selenium (Se) and resveratrol (RSV). The activation of TRPM2 induces apoptosis and oxidative injury in the optic nerve. The inhibition of TRPM2 may decrease the optic nerve injury action of diabetes mellitus after the treatments of Se and RSV. Present study aimed to investigate the protective actions of Se and RSV on the excessive Ca2+ influx and mitROS generation-mediated optic nerve oxidative injury via the modulation of TRPM2. Fifty-six C57BL/6j male mice were divided into seven groups as control, Se, RSV, streptozotocin (STZ), STZ + Se, STZ + RSV, and STZ + Se + RSV. The STZ-mediated stimulation of TRPM2 increased the cytosolic Ca2+, lipid peroxidation, mitROS, cytosolic ROS, apoptosis, caspase-3, caspase-8, and caspase-9 concentrations in the mice, although their concentrations were decreased in the optic nerve by the treatments of Se and RSV. The STZ-induced decrease of optic nerve viability, glutathione, glutathione peroxidase, vitamin A, and vitamin E concentrations was also upregulated by the treatments of Se and RSV. The STZ-induced increase of TRPM2, PARP-1, caspase-3, and caspase-9 protein band expressions was diminished by the treatments of Se and RSV. In conclusion, STZ induced the optic nerve oxidative injury and apoptosis via the upregulation of TRPM2 stimulation, although the treatments of Se and RSV decreased the injury and apoptosis via the downregulation of TRPM2 activity.
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Affiliation(s)
- Hatice Daldal
- Department of Ophthalmology, Faculty of Medicine, Usak University, TR-64100, Usak, Turkey.
| | - Mustafa Nazıroğlu
- Neuroscience Research Center, Suleyman Demirel University, TR-32260, Isparta, Turkey
- Drug Discovery Unit, BSN Health, Analyses, Innov., Consult., Org., Agricul., Ltd., TR-32260, Isparta, Turkey
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14
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Ehrlich W, Gahan JM, Rentzsch F, Kühn FJP. TRPM2 causes sensitization to oxidative stress but attenuates high-temperature injury in the sea anemone Nematostella vectensis. J Exp Biol 2022; 225:jeb243717. [PMID: 35202476 DOI: 10.1242/jeb.243717] [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: 10/25/2021] [Accepted: 02/21/2022] [Indexed: 11/20/2022]
Abstract
In humans, the cation channel TRPM2 (HsTRPM2) has been intensively studied because it is involved in oxidative stress-mediated apoptosis and also contributes to temperature regulation. The gating mechanism of TRPM2 is quite complex, with a C-terminally localized enzyme domain playing a crucial role. The analysis of orthologues of TRPM2, in particular from the distantly related marine invertebrate Nematostella vectensis (NvTRPM2), revealed that during evolution, the functional role of the endogenous enzyme domain of TRPM2 has undergone fundamental changes. In this study, we investigated whether these evolutionary differences also apply to the physiological functions of TRPM2. For this purpose, we generated a TRPM2 loss-of-function mutation in N. vectensis and compared the phenotypes of wild-type and mutant animals after exposure to either oxidative stress or high temperature. Our results show that under standard culture conditions, mutant animals are indistinguishable from wild-type animals in terms of morphology and development. However, exposure of the two experimental groups to different stressors revealed that TRPM2 causes sensitization to oxidative stress but attenuates high-temperature injury in N. vectensis. Therefore, NvTRPM2 plays opposite roles in the cellular response to these two different stressors. These findings reveal a similar physiological spectrum of activity of TRPM2 in humans and N. vectensis and open up the possibility of establishing N. vectensis as a model organism for the physiological function of TRPM2.
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Affiliation(s)
- Wiebke Ehrlich
- Institute of Physiology, Medical Faculty,University Hospital Aachen, 52074 Aachen, Germany
| | - James M Gahan
- Sars International Centre for Marine Molecular Biology, University of Bergen, 5008 Bergen, Norway
| | - Fabian Rentzsch
- Sars International Centre for Marine Molecular Biology, University of Bergen, 5008 Bergen, Norway
| | - Frank J P Kühn
- Institute of Physiology, Medical Faculty,University Hospital Aachen, 52074 Aachen, Germany
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15
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Distribution and Assembly of TRP Ion Channels. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2022; 1349:111-138. [PMID: 35138613 DOI: 10.1007/978-981-16-4254-8_7] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
In the last several decades, a large family of ion channels have been identified and studied intensively as cellular sensors for diverse physical and/or chemical stimuli. Named transient receptor potential (TRP) channels, they play critical roles in various aspects of cellular physiology. A large number of human hereditary diseases are found to be linked to TRP channel mutations, and their dysregulations lead to acute or chronical health problems. As TRP channels are named and categorized mostly based on sequence homology rather than functional similarities, they exhibit substantial functional diversity. Rapid advances in TRP channel study have been made in recent years and reported in a vast body of literature; a summary of the latest advancements becomes necessary. This chapter offers an overview of current understandings of TRP channel distribution and subunit assembly.
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16
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Zong P, Lin Q, Feng J, Yue L. A Systemic Review of the Integral Role of TRPM2 in Ischemic Stroke: From Upstream Risk Factors to Ultimate Neuronal Death. Cells 2022; 11:491. [PMID: 35159300 PMCID: PMC8834171 DOI: 10.3390/cells11030491] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Revised: 01/26/2022] [Accepted: 01/29/2022] [Indexed: 02/04/2023] Open
Abstract
Ischemic stroke causes a heavy health burden worldwide, with over 10 million new cases every year. Despite the high prevalence and mortality rate of ischemic stroke, the underlying molecular mechanisms for the common etiological factors of ischemic stroke and ischemic stroke itself remain unclear, which results in insufficient preventive strategies and ineffective treatments for this devastating disease. In this review, we demonstrate that transient receptor potential cation channel, subfamily M, member 2 (TRPM2), a non-selective ion channel activated by oxidative stress, is actively involved in all the important steps in the etiology and pathology of ischemic stroke. TRPM2 could be a promising target in screening more effective prophylactic strategies and therapeutic medications for ischemic stroke.
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Affiliation(s)
- Pengyu Zong
- Department of Cell Biology, Calhoun Cardiology Center, University of Connecticut School of Medicine (UConnHealth), Farmington, CT 06030, USA; (P.Z.); (J.F.)
| | - Qiaoshan Lin
- Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT 06269, USA;
| | - Jianlin Feng
- Department of Cell Biology, Calhoun Cardiology Center, University of Connecticut School of Medicine (UConnHealth), Farmington, CT 06030, USA; (P.Z.); (J.F.)
| | - Lixia Yue
- Department of Cell Biology, Calhoun Cardiology Center, University of Connecticut School of Medicine (UConnHealth), Farmington, CT 06030, USA; (P.Z.); (J.F.)
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17
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Funazaki S, Yoshida M, Yamada H, Kakei M, Kawakami M, Nagashima S, Hara K, Dezaki K. A novel mechanism of imeglimin-mediated insulin secretion via the cADPR-TRP channel pathway. J Diabetes Investig 2022; 13:34-41. [PMID: 34523242 PMCID: PMC8756313 DOI: 10.1111/jdi.13669] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 09/02/2021] [Accepted: 09/12/2021] [Indexed: 01/20/2023] Open
Abstract
AIMS/INTRODUCTION Imeglimin is a novel oral hypoglycemic agent that improves blood glucose levels through multiple mechanisms of action including the enhancement of glucose-stimulated insulin secretion (GSIS), however, the details of this mechanism have not been clarified. In the process of GSIS, activation of the transient receptor potential melastatin 2 (TRPM2) channel, a type of non-selective cation channel (NSCCs) in β-cells, promotes plasma membrane depolarization. The present study aimed to examine whether imeglimin potentiates GSIS via the TRPM2 channel in β-cells. MATERIALS AND METHODS Pancreatic islets were isolated by collagenase digestion from male wild-type and TRPM2-knockout (KO) mice. Insulin release and nicotinamide adenine dinucleotide (NAD+ ) production in islets were measured under static incubation. NSCC currents in mouse single β-cells were measured by patch-clamp experiments. RESULTS Batch-incubation studies showed that imeglimin enhanced GSIS at stimulatory 16.6 mM glucose, whereas it did not affect basal insulin levels at 2.8 mM glucose. Imeglimin increased the glucose-induced production of NAD+ , a precursor of cADPR, in islets and the insulinotropic effects of imeglimin were attenuated by a cADPR inhibitor 8-Br-cADPR. Furthermore, imeglimin increased NSCC current in β-cells, and abolished this current in TRPM2-KO mice. Imeglimin did not potentiate GSIS in the TRPM2-KO islets, suggesting that imeglimin's increase of NSCC currents through the TRPM2 channel is causally implicated in its insulin releasing effects. CONCLUSIONS Imeglimin may activate TRPM2 channels in β-cells via the production of NAD+ /cADPR, leading to the potentiation of GSIS. Developing approaches to stimulate cADPR-TRPM2 signaling provides a potential therapeutic tool to treat type 2 diabetes.
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Affiliation(s)
- Shunsuke Funazaki
- Department of MedicineDivision of Endocrinology and MetabolismJichi Medical University Saitama Medical CenterSaitamaJapan
| | - Masashi Yoshida
- Department of MedicineDivision of Endocrinology and MetabolismJichi Medical University Saitama Medical CenterSaitamaJapan
| | - Hodaka Yamada
- Department of MedicineDivision of Endocrinology and MetabolismJichi Medical University Saitama Medical CenterSaitamaJapan
| | - Masafumi Kakei
- Department of MedicineDivision of Endocrinology and MetabolismJichi Medical University Saitama Medical CenterSaitamaJapan
| | - Masanobu Kawakami
- Department of MedicineDivision of Endocrinology and MetabolismJichi Medical University Saitama Medical CenterSaitamaJapan
| | - Shuichi Nagashima
- Department of MedicineDivision of Endocrinology and MetabolismJichi Medical University Saitama Medical CenterSaitamaJapan
| | - Kazuo Hara
- Department of MedicineDivision of Endocrinology and MetabolismJichi Medical University Saitama Medical CenterSaitamaJapan
| | - Katsuya Dezaki
- Department of PhysiologyDivision of Integrative PhysiologyJichi Medical UniversityShimotsuke‐shiJapan
- Faculty of PharmacyIryo Sosei UniversityIwakiJapan
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18
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Wang X, Xiao Y, Huang M, Shen B, Xue H, Wu K. Effect of TRPM2-Mediated Calcium Signaling on Cell Proliferation and Apoptosis in Esophageal Squamous Cell Carcinoma. Technol Cancer Res Treat 2021; 20:15330338211045213. [PMID: 34605693 PMCID: PMC8642046 DOI: 10.1177/15330338211045213] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Esophageal squamous cell carcinoma (ESCC) is the sixth leading cause of death due to
cancer, indicating that finding new therapeutic targets or approaches for ESCC treatment
is imperative. Transient Receptor Potential cation channel subfamily M, member 2 (TRPM2)
is a calcium-permeable, nonselective cation channel that responds to reactive oxygen
species (ROS), which are found in the tumor microenvironment and are important regulators
of tumorigenesis, cell proliferation, apoptosis, and the therapeutic response. Here, we
used immunohistochemical analysis of tumor tissue derived from patients with ESCC to find
that the TRPM2 channel protein expression level was increased in tumor tissue compared
with adjacent normal tissue. Intracellular calcium concentration measurements, western
blotting, and ROS and cell viability assays were used with a human ESCC cell line (TE-1
cells) to find that TRPM2 participated in the ROS hydrogen peroxide-induced increase in
intracellular calcium. This increased calcium inhibited cell proliferation and enhanced
apoptosis. Pretreatment of cells with the anticancer agent 5-fluorouracil (5-FU)
significantly increased ROS production, which potentiated TRPM2-mediated calcium
signaling, decreased cell proliferation, and increased apoptosis in TE-1 cells, suggesting
that the therapeutic effect of 5-FU in ESCC cells may be mediated by the TRPM2
channel-mediated calcium influx. These findings offer a potential treatment target and
provide mechanistic insight into the therapeutic effects of 5-FU in patients with
ESCC.
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Affiliation(s)
- Xingbang Wang
- Lu'an People's Hospital, Lu'an Affiliated Hospital of Anhui Medical University, Lu'an, China
| | - Yong Xiao
- Lu'an People's Hospital, Lu'an Affiliated Hospital of Anhui Medical University, Lu'an, China
| | - Mingming Huang
- Lu'an People's Hospital, Lu'an Affiliated Hospital of Anhui Medical University, Lu'an, China
| | - Bing Shen
- School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - Haowei Xue
- 36639The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Kaile Wu
- 36639The First Affiliated Hospital of Anhui Medical University, Hefei, China
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Chen J, Zhang M, Ma Z, Yuan D, Zhu J, Tuo B, Li T, Liu X. Alteration and dysfunction of ion channels/transporters in a hypoxic microenvironment results in the development and progression of gastric cancer. Cell Oncol (Dordr) 2021; 44:739-749. [PMID: 33856653 PMCID: PMC8338819 DOI: 10.1007/s13402-021-00604-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/19/2021] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Gastric cancer (GC) is one of the most common malignant cancers in the world and has only few treatment options and, concomitantly, a poor prognosis. It is generally accepted now that the tumor microenvironment, particularly that under hypoxia, plays an important role in cancer development. Hypoxia can regulate the energy metabolism and malignancy of tumor cells by inducing or altering various important factors, such as oxidative stress, reactive oxygen species (ROS), hypoxia-inducible factors (HIFs), autophagy and acidosis. In addition, altered expression and/or dysfunction of ion channels/transporters (ICTs) have been encountered in a variety of human tumors, including GC, and to play an important role in the processes of tumor cell proliferation, migration, invasion and apoptosis. Increasing evidence indicates that ICTs are at least partly involved in interactions between cancer cells and their hypoxic microenvironment. Here, we provide an overview of the different ICTs that regulate or are regulated by hypoxia in GC. CONCLUSIONS AND PERSPECTIVES Hypoxia is one of the major obstacles to cancer therapy. Regulating cellular responses and factors under hypoxia can inhibit GC. Similarly, altering the expression or activity of ICTs, such as the application of ion channel inhibitors, can slow down the growth and/or migration of GC cells. Since targeting the hypoxic microenvironment and/or ICTs may be a promising strategy for the treatment of GC, more attention should be paid to the interplay between ICTs and the development and progression of GC in such a microenvironment.
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Affiliation(s)
- Junling Chen
- Department of Gastroenterology, Affiliated Hospital of Zunyi Medical University, Zunyi, 563003, Guizhou Province, China
- Digestive Disease Institute of Guizhou Province, Zunyi, Guizhou Province, China
| | - Minglin Zhang
- Department of Gastroenterology, Affiliated Hospital of Zunyi Medical University, Zunyi, 563003, Guizhou Province, China
- Digestive Disease Institute of Guizhou Province, Zunyi, Guizhou Province, China
| | - Zhiyuan Ma
- Department of Gastroenterology, Affiliated Hospital of Zunyi Medical University, Zunyi, 563003, Guizhou Province, China
- Digestive Disease Institute of Guizhou Province, Zunyi, Guizhou Province, China
- Department of Thyroid and Breast Surgery, Affiliated Hospital of Zunyi Medical University, Zunyi, 563003, Guizhou Province, China
| | - Dumin Yuan
- Department of Gastroenterology, Affiliated Hospital of Zunyi Medical University, Zunyi, 563003, Guizhou Province, China
- Digestive Disease Institute of Guizhou Province, Zunyi, Guizhou Province, China
| | - Jiaxing Zhu
- Department of Gastroenterology, Affiliated Hospital of Zunyi Medical University, Zunyi, 563003, Guizhou Province, China
- Digestive Disease Institute of Guizhou Province, Zunyi, Guizhou Province, China
| | - Biguang Tuo
- Department of Gastroenterology, Affiliated Hospital of Zunyi Medical University, Zunyi, 563003, Guizhou Province, China
- Digestive Disease Institute of Guizhou Province, Zunyi, Guizhou Province, China
| | - Taolang Li
- Department of Thyroid and Breast Surgery, Affiliated Hospital of Zunyi Medical University, Zunyi, 563003, Guizhou Province, China.
| | - Xuemei Liu
- Department of Gastroenterology, Affiliated Hospital of Zunyi Medical University, Zunyi, 563003, Guizhou Province, China.
- Digestive Disease Institute of Guizhou Province, Zunyi, Guizhou Province, China.
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20
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Stožer A, Paradiž Leitgeb E, Pohorec V, Dolenšek J, Križančić Bombek L, Gosak M, Skelin Klemen M. The Role of cAMP in Beta Cell Stimulus-Secretion and Intercellular Coupling. Cells 2021; 10:1658. [PMID: 34359828 PMCID: PMC8304079 DOI: 10.3390/cells10071658] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 06/18/2021] [Accepted: 06/28/2021] [Indexed: 12/22/2022] Open
Abstract
Pancreatic beta cells secrete insulin in response to stimulation with glucose and other nutrients, and impaired insulin secretion plays a central role in development of diabetes mellitus. Pharmacological management of diabetes includes various antidiabetic drugs, including incretins. The incretin hormones, glucagon-like peptide-1 and gastric inhibitory polypeptide, potentiate glucose-stimulated insulin secretion by binding to G protein-coupled receptors, resulting in stimulation of adenylate cyclase and production of the secondary messenger cAMP, which exerts its intracellular effects through activation of protein kinase A or the guanine nucleotide exchange protein 2A. The molecular mechanisms behind these two downstream signaling arms are still not fully elucidated and involve many steps in the stimulus-secretion coupling cascade, ranging from the proximal regulation of ion channel activity to the central Ca2+ signal and the most distal exocytosis. In addition to modifying intracellular coupling, the effect of cAMP on insulin secretion could also be at least partly explained by the impact on intercellular coupling. In this review, we systematically describe the possible roles of cAMP at these intra- and inter-cellular signaling nodes, keeping in mind the relevance for the whole organism and translation to humans.
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Affiliation(s)
- Andraž Stožer
- Institute of Physiology, Faculty of Medicine, University of Maribor, SI-2000 Maribor, Slovenia; (A.S.); (E.P.L.); (V.P.); (J.D.); (L.K.B.); (M.G.)
| | - Eva Paradiž Leitgeb
- Institute of Physiology, Faculty of Medicine, University of Maribor, SI-2000 Maribor, Slovenia; (A.S.); (E.P.L.); (V.P.); (J.D.); (L.K.B.); (M.G.)
| | - Viljem Pohorec
- Institute of Physiology, Faculty of Medicine, University of Maribor, SI-2000 Maribor, Slovenia; (A.S.); (E.P.L.); (V.P.); (J.D.); (L.K.B.); (M.G.)
| | - Jurij Dolenšek
- Institute of Physiology, Faculty of Medicine, University of Maribor, SI-2000 Maribor, Slovenia; (A.S.); (E.P.L.); (V.P.); (J.D.); (L.K.B.); (M.G.)
- Faculty of Natural Sciences and Mathematics, University of Maribor, SI-2000 Maribor, Slovenia
| | - Lidija Križančić Bombek
- Institute of Physiology, Faculty of Medicine, University of Maribor, SI-2000 Maribor, Slovenia; (A.S.); (E.P.L.); (V.P.); (J.D.); (L.K.B.); (M.G.)
| | - Marko Gosak
- Institute of Physiology, Faculty of Medicine, University of Maribor, SI-2000 Maribor, Slovenia; (A.S.); (E.P.L.); (V.P.); (J.D.); (L.K.B.); (M.G.)
- Faculty of Natural Sciences and Mathematics, University of Maribor, SI-2000 Maribor, Slovenia
| | - Maša Skelin Klemen
- Institute of Physiology, Faculty of Medicine, University of Maribor, SI-2000 Maribor, Slovenia; (A.S.); (E.P.L.); (V.P.); (J.D.); (L.K.B.); (M.G.)
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21
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Tóth B, Iordanov I, Csanády L. Selective profiling of N- and C-terminal nucleotide-binding sites in a TRPM2 channel. J Gen Physiol 2021; 152:151583. [PMID: 32211872 PMCID: PMC7201885 DOI: 10.1085/jgp.201912533] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Accepted: 02/20/2020] [Indexed: 11/23/2022] Open
Abstract
Transient receptor potential melastatin 2 (TRPM2) is a homotetrameric Ca2+-permeable cation channel important for the immune response, body temperature regulation, and insulin secretion, and is activated by cytosolic Ca2+ and ADP ribose (ADPR). ADPR binds to two distinct locations, formed by large N- and C-terminal cytosolic domains, respectively, of the channel protein. In invertebrate TRPM2 channels, the C-terminal site is not required for channel activity but acts as an active ADPR phosphohydrolase that cleaves the activating ligand. In vertebrate TRPM2 channels, the C-terminal site is catalytically inactive but cooperates with the N-terminal site in channel activation. The precise functional contributions to channel gating and the nucleotide selectivities of the two sites in various species have not yet been deciphered. For TRPM2 of the sea anemone Nematostella vectensis (nvTRPM2), catalytic activity is solely attributable to the C-terminal site. Here, we show that nvTRPM2 channel gating properties remain unaltered upon deletion of the C-terminal domain, indicating that the N-terminal site is single-handedly responsible for channel gating. Exploiting such functional independence of the N- and C-terminal sites, we selectively measure their affinity profiles for a series of ADPR analogues, as reflected by apparent affinities for channel activation and catalysis, respectively. Using site-directed mutagenesis, we confirm that the same N-terminal site observed in vertebrate TRPM2 channels was already present in ancient cnidarians. Finally, by characterizing the functional effects of six amino acid side chain truncations in the N-terminal site, we provide first insights into the mechanistic contributions of those side chains to TRPM2 channel gating.
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Affiliation(s)
- Balázs Tóth
- Department of Medical Biochemistry, Semmelweis University, Budapest, Hungary.,MTA-SE Lendület Ion Channel Research Group, Semmelweis University, Budapest, Hungary
| | - Iordan Iordanov
- Department of Medical Biochemistry, Semmelweis University, Budapest, Hungary.,MTA-SE Lendület Ion Channel Research Group, Semmelweis University, Budapest, Hungary
| | - László Csanády
- Department of Medical Biochemistry, Semmelweis University, Budapest, Hungary.,MTA-SE Lendület Ion Channel Research Group, Semmelweis University, Budapest, Hungary
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22
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Abstract
Already for centuries, humankind is driven to understand the physiological and pathological mechanisms that occur in our brains. Today, we know that ion channels play an essential role in the regulation of neural processes and control many functions of the central nervous system. Ion channels present a diverse group of membrane-spanning proteins that allow ions to penetrate the insulating cell membrane upon opening of their channel pores. This regulated ion permeation results in different electrical and chemical signals that are necessary to maintain physiological excitatory and inhibitory processes in the brain. Therefore, it is no surprise that disturbances in the functions of cerebral ion channels can result in a plethora of neurological disorders, which present a tremendous health care burden for our current society. The identification of ion channel-related brain disorders also fuel the research into the roles of ion channel proteins in various brain states. In the last decade, mounting evidence has been collected that indicates a pivotal role for transient receptor potential (TRP) ion channels in the development and various physiological functions of the central nervous system. For instance, TRP channels modulate neurite growth, synaptic plasticity and integration, and are required for neuronal survival. Moreover, TRP channels are involved in numerous neurological disorders. TRPM3 belongs to the melastatin subfamily of TRP channels and represents a non-selective cation channel that can be activated by several different stimuli, including the neurosteroid pregnenolone sulfate, osmotic pressures and heat. The channel is best known as a peripheral nociceptive ion channel that participates in heat sensation. However, recent research identifies TRPM3 as an emerging new player in the brain. In this review, we summarize the available data regarding the roles of TRPM3 in the brain, and correlate these data with the neuropathological processes in which this ion channel may be involved.
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Affiliation(s)
- Katharina Held
- Laboratory of Endometrium, Endometriosis and Reproductive Medicine, Department of Development and Regeneration, KU Leuven, Leuven, Belgium
- Laboratory of Ion Channel Research, Department of Cellular and Molecular Medicine and VIB-KU Leuven Center for Brain and Disease Research, KU Leuven, Leuven, Belgium
| | - Balázs István Tóth
- Laboratory of Cellular and Molecular Physiology, Department of Physiology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
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Nakao A, Matsunaga Y, Hayashida K, Takahashi N. Role of Oxidative Stress and Ca 2+ Signaling in Psychiatric Disorders. Front Cell Dev Biol 2021; 9:615569. [PMID: 33644051 PMCID: PMC7905097 DOI: 10.3389/fcell.2021.615569] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Accepted: 01/25/2021] [Indexed: 12/21/2022] Open
Abstract
Psychiatric disorders are caused by complex and diverse factors, and numerous mechanisms have been proposed for the pathogenesis of these disorders. Accumulating evidence suggests that oxidative stress is one of the general factors involved in the pathogenesis/pathophysiology of major psychiatric disorders, including bipolar disorder, depression, anxiety disorder, and schizophrenia. Indeed, some clinical trials have shown improvement of the symptoms of these disorders by antioxidant supplementation. However, the molecular basis for the relationship between oxidative stress and the pathogenesis of psychiatric disorders remains largely unknown. In general, Ca2+ channels play central roles in neuronal functions, including neuronal excitability, neurotransmitter release, synaptic plasticity, and gene regulation, and genes that encode Ca2+ channels have been found to be associated with psychiatric disorders. Notably, a class of Ca2+-permeable transient receptor potential (TRP) cation channels is activated by changes in cellular redox status, whereby these TRP channels can link oxidative stress to Ca2+ signals. Given the unique characteristic of redox-sensitive TRP channels, these channels could be a target for delineating the pathogenesis or pathophysiology of psychiatric disorders. In this review, we summarize the outcomes of clinical trials for antioxidant treatment in patients with psychiatric disorders and the current insights into the physiological/pathological significance of redox-sensitive TRP channels in the light of neural functions, including behavioral phenotypes, and discuss the potential role of TRP channels in the pathogenesis of psychiatric disorders. Investigation of redox-sensitive TRP channels may lead to the development of novel therapeutic strategies for the treatment of psychiatric disorders.
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Affiliation(s)
- Akito Nakao
- Laboratory of Molecular Biology, Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, Japan
| | - Yoshihiro Matsunaga
- Laboratory of Molecular Biology, Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, Japan
| | - Katsumi Hayashida
- Laboratory of Molecular Biology, Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, Japan
| | - Nobuaki Takahashi
- The Hakubi Center for Advanced Research, Kyoto University, Kyoto, Japan
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24
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Kashio M. Thermosensation involving thermo-TRPs. Mol Cell Endocrinol 2021; 520:111089. [PMID: 33227348 DOI: 10.1016/j.mce.2020.111089] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 02/02/2020] [Accepted: 11/17/2020] [Indexed: 12/13/2022]
Abstract
The transient receptor potential (TRP) channels constitute a superfamily of large ion channels that are activated by a wide range of chemical, mechanical and thermal stimuli. TRP channels with temperature sensitivity are called thermo-TRPs. They are involved in diverse physiological functions through their detection of external environmental temperature and internal body temperature. Each thermo-TRP has its own characteristic temperature threshold for activation. As a group, they cover temperatures ranging from cold to nociceptive high temperatures. Recently, many studies have identified the functions of thermo-TRPs residing in deep organs where they are exposed to body temperature. Importantly, temperature thresholds of thermo-TRPs can be regulated by physiological factors enabling their function at relatively constant body temperature. Moreover, several thermo-TRPs are reportedly engaged in body temperature regulation. This review will summarize the current understanding of thermo-TRPs, including their roles in thermosensation and functional regulation of physiological responses at body temperature and the regulation of body temperature.
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Affiliation(s)
- Makiko Kashio
- Department of Physiology, Aichi Medical University, 1-1 Yazakokarimata, Nagakute, Aichi, 480-1195, Japan.
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25
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Yu S, Li C, Ding Y, Huang S, Wang W, Wu Y, Wang F, Wang A, Han Y, Sun Z, Lu Y, Gu N. Exploring the 'cold/hot' properties of traditional Chinese medicine by cell temperature measurement. PHARMACEUTICAL BIOLOGY 2020; 58:208-218. [PMID: 32114881 PMCID: PMC7067177 DOI: 10.1080/13880209.2020.1732429] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Context: It is common sense that chewing a mint leaf can cause a cooling feeling, while chewing ginger root will produce a burning feeling. In Traditional Chinese Medicine (TCM), this phenomenon is referred to as 'cold/hot' properties of herbs. Herein, it is reported that TCM with different "cold/hot" properties have different effects on the variation of cells.Objective: To explore the intrinsic 'cold/hot' properties of TCM from the perspective of cellular and molecular biology.Materials and methods: A375 cells were selected using Cancer Cell Line Encyclopaedia (CCLE) analysis and western blots. Hypaconitine and baicalin were selected by structural similarity analysis from 56 and 140 compounds, respectively. A wireless thermometry system was used to measure cellular temperature change induced by different compounds. Alteration of intracellular calcium influx was investigated by means of calcium imaging.Results: The IC50 values of GSK1016790A, HC067047, hypaconitine, and baicalin for A375 cells are 8.363 nM, 816.4 μM, 286.4 μM and 29.84 μM, respectively. And, 8 μM hypaconitine induced obvious calcium influx while 8 μM baicalin inhibited calcium influx induced by TRPV4 activation. Cellular temperature elevated significantly when treated with GSK1016790A or hypaconitine, while the results were reversed when cells were treated with HC067047 or baicalin.Discussion and conclusions: The changes in cellular temperature are speculated to be caused by the alteration of intracellular calcium influx mediated by TRPV4. In addition, the 'cold/hot' properties of compounds in TCM can be classified by using cellular temperature detection.
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Affiliation(s)
- Suyun Yu
- Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, Jiangsu Collaborative Innovation Center of Traditional Chinese Medicine Prevention and Treatment of Tumor, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Can Li
- School of Artificial Intelligence and Information Technology, Nanjing University of Chinese Medicine, Nanjing, China
| | - Yushi Ding
- Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, Jiangsu Collaborative Innovation Center of Traditional Chinese Medicine Prevention and Treatment of Tumor, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Shuai Huang
- Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, Jiangsu Collaborative Innovation Center of Traditional Chinese Medicine Prevention and Treatment of Tumor, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Wei Wang
- Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, Jiangsu Collaborative Innovation Center of Traditional Chinese Medicine Prevention and Treatment of Tumor, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Yuanyuan Wu
- Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, Jiangsu Collaborative Innovation Center of Traditional Chinese Medicine Prevention and Treatment of Tumor, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Fangxu Wang
- The State Key Laboratory of Bioelectronics and Jiangsu Key Laboratory of Biomaterials and Devices, School of Biological Sciences and Medical Engineering of Southeast University, Nanjing, China
- Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou, China
| | - Aiyun Wang
- Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, Jiangsu Collaborative Innovation Center of Traditional Chinese Medicine Prevention and Treatment of Tumor, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Yuexia Han
- The State Key Laboratory of Bioelectronics and Jiangsu Key Laboratory of Biomaterials and Devices, School of Biological Sciences and Medical Engineering of Southeast University, Nanjing, China
- Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou, China
| | - Zhiguang Sun
- Jiangsu Provincial Second Chinese Medicine Hospital, The Second Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, China
| | - Yin Lu
- Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, Jiangsu Collaborative Innovation Center of Traditional Chinese Medicine Prevention and Treatment of Tumor, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
- CONTACT Yin Lu
| | - Ning Gu
- The State Key Laboratory of Bioelectronics and Jiangsu Key Laboratory of Biomaterials and Devices, School of Biological Sciences and Medical Engineering of Southeast University, Nanjing, China
- Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou, China
- Ning Gu
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26
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Kamei J, Aizawa N, Nakagawa T, Kaneko S, Fujimura T, Homma Y, Kume H, Igawa Y. Lacking transient receptor potential melastatin 2 attenuates lipopolysaccharide-induced bladder inflammation and its associated hypersensitivity in mice. Int J Urol 2020; 28:107-114. [PMID: 33026125 DOI: 10.1111/iju.14389] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 09/02/2020] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To study the role of transient receptor potential melastatin 2 in bladder function and inflammation-associated hypersensitivity. METHODS We evaluated physiological function of the bladder and intravesical lipopolysaccharide-induced inflammatory nociceptive responses in female wild-type and transient receptor potential melastatin 2-knockout mice. In vivo frequency/volume and decerebrated unanesthetized cystometry measurements, as well as in vitro detrusor strip functional studies, were carried out to evaluate bladder function. Mice received intravesical lipopolysaccharide (2.0 mg/mL) or saline instillation to evaluate responses to bladder inflammation. Voiding and bladder pain-like behaviors, cystometry measurements and histological evaluation were carried out before and after intravesical lipopolysaccharide instillation. RESULTS Few phenotypic differences in in vivo and in vitro physiological function were found between the two genotypes. Comparison of measurements taken before and 24-48 h after intravesical lipopolysaccharide instillation showed that voiding parameters did not change in transient receptor potential melastatin 2-knockout mice, whereas an increased voiding frequency was observed in wild-type mice. At 24 h after intravesical lipopolysaccharide instillation, the numbers of bladder pain-like behaviors and of infiltrated inflammatory cells in the bladder submucosal layer were significantly increased, and the voided volume and the intercontraction interval were significantly decreased on cystometry measurements in wild-type mice compared with those in both transient receptor potential melastatin 2-knockout mice and in wild-type mice treated with saline instillation. CONCLUSIONS Although the physiological roles of transient receptor potential melastatin 2 channels in the bladder might be limited, inflammation and associated hypersensitivity of the bladder caused by intravesical lipopolysaccharide instillation are attenuated in transient receptor potential melastatin 2-knockout mice, suggesting pathophysiological roles of transient receptor potential melastatin 2 channels in these processes.
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Affiliation(s)
- Jun Kamei
- Department of Urology, Jichi Medical University, Tochigi, Japan.,Department of Continence Medicine, The University of Tokyo Graduate School of Medicine, Tokyo, Japan
| | - Naoki Aizawa
- Department of Continence Medicine, The University of Tokyo Graduate School of Medicine, Tokyo, Japan.,Department of Pharmacology and Toxicology, Dokkyo Medical University, Tochigi, Japan
| | - Takayuki Nakagawa
- Clinical Pharmacology and Therapeutics, Kyoto University Hospital, Kyoto, Japan.,Department of Molecular Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
| | - Shuji Kaneko
- Department of Molecular Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
| | | | - Yukio Homma
- Department of Urology, Japan Red Cross Hospital, Tokyo, Japan
| | - Haruki Kume
- Department of Urology, The University of Tokyo Graduate School of Medicine, Tokyo, Japan
| | - Yasuhiko Igawa
- Department of Continence Medicine, The University of Tokyo Graduate School of Medicine, Tokyo, Japan.,Department of Urology, Nagano Prefectural Medical Center, Suzaka, Japan
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27
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Lü W, Du J. The N-terminal domain in TRPM2 channel is a conserved nucleotide binding site. J Gen Physiol 2020; 152:151652. [PMID: 32282890 PMCID: PMC7201883 DOI: 10.1085/jgp.201912555] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Affiliation(s)
- Wei Lü
- Van Andel Institute, Grand Rapids, MI
| | - Juan Du
- Van Andel Institute, Grand Rapids, MI
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28
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Magnone M, Sturla L, Guida L, Spinelli S, Begani G, Bruzzone S, Fresia C, Zocchi E. Abscisic Acid: A Conserved Hormone in Plants and Humans and a Promising Aid to Combat Prediabetes and the Metabolic Syndrome. Nutrients 2020; 12:nu12061724. [PMID: 32526875 PMCID: PMC7352484 DOI: 10.3390/nu12061724] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 06/03/2020] [Accepted: 06/03/2020] [Indexed: 12/25/2022] Open
Abstract
Abscisic acid (ABA) is a hormone with a very long evolutionary history, dating back to the earliest living organisms, of which modern (ABA-producing) cyanobacteria are likely the descendants, well before separation of the plant and animal kingdoms, with a conserved role as a signal regulating cell responses to environmental challenges. In mammals, nanomolar ABA controls the metabolic response to glucose availability by stimulating glucose uptake in skeletal muscle and adipose tissue with an insulin-independent mechanism and increasing energy expenditure in the brown and white adipose tissues. Activation by ABA of AMP-dependent kinase (AMPK), in contrast to the insulin-induced activation of AMPK-inhibiting Akt, is responsible for stimulation of GLUT4-mediated muscle glucose uptake, and for the browning effect on white adipocytes. Intake of micrograms per Kg body weight of ABA improves glucose tolerance in both normal and in borderline subjects and chronic intake of such a dose of ABA improves blood glucose, lipids and morphometric parameters (waist circumference and body mass index) in borderline subjects for prediabetes and the metabolic syndrome. This review summarizes the most recent results obtained in vivo with microgram amounts of ABA, the role of the receptor LANCL2 in the hormone’s action and the significance of the endowment by mammals of two different hormones controlling the metabolic response to glucose availability. Finally, open issues in need of further investigation and perspectives for the clinical use of nutraceutical ABA are discussed.
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Affiliation(s)
- Mirko Magnone
- Nutravis S.r.l., Via Corsica 2/19, 16128 Genova, Italy
- Department of Experimental Medicine, University of Genova, 16132 Genova, Italy; (L.S.); (L.G.); (S.S.); (G.B.); (S.B.)
- Correspondence: (M.M.); (E.Z.); Tel.: +39-10-3538131 (M.M.); +39-10-3538161 (E.Z.)
| | - Laura Sturla
- Department of Experimental Medicine, University of Genova, 16132 Genova, Italy; (L.S.); (L.G.); (S.S.); (G.B.); (S.B.)
| | - Lucrezia Guida
- Department of Experimental Medicine, University of Genova, 16132 Genova, Italy; (L.S.); (L.G.); (S.S.); (G.B.); (S.B.)
| | - Sonia Spinelli
- Department of Experimental Medicine, University of Genova, 16132 Genova, Italy; (L.S.); (L.G.); (S.S.); (G.B.); (S.B.)
| | - Giulia Begani
- Department of Experimental Medicine, University of Genova, 16132 Genova, Italy; (L.S.); (L.G.); (S.S.); (G.B.); (S.B.)
| | - Santina Bruzzone
- Department of Experimental Medicine, University of Genova, 16132 Genova, Italy; (L.S.); (L.G.); (S.S.); (G.B.); (S.B.)
| | - Chiara Fresia
- Molecular and Cell Biology Laboratory, Salk Institute for Biological Studies, 10010 N Torrey Pines Rd, La Jolla, CA 92037, USA;
| | - Elena Zocchi
- Department of Experimental Medicine, University of Genova, 16132 Genova, Italy; (L.S.); (L.G.); (S.S.); (G.B.); (S.B.)
- Correspondence: (M.M.); (E.Z.); Tel.: +39-10-3538131 (M.M.); +39-10-3538161 (E.Z.)
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29
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Pallagi P, Madácsy T, Varga Á, Maléth J. Intracellular Ca 2+ Signalling in the Pathogenesis of Acute Pancreatitis: Recent Advances and Translational Perspectives. Int J Mol Sci 2020; 21:ijms21114005. [PMID: 32503336 PMCID: PMC7312053 DOI: 10.3390/ijms21114005] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 05/26/2020] [Accepted: 06/01/2020] [Indexed: 12/12/2022] Open
Abstract
Intracellular Ca2+ signalling is a major signal transductional pathway in non-excitable cells, responsible for the regulation of a variety of physiological functions. In the secretory epithelial cells of the exocrine pancreas, such as acinar and ductal cells, intracellular Ca2+ elevation regulates digestive enzyme secretion in acini or fluid and ion secretion in ductal cells. Although Ca2+ is a uniquely versatile orchestrator of epithelial physiology, unregulated global elevation of the intracellular Ca2+ concentration is an early trigger for the development of acute pancreatitis (AP). Regardless of the aetiology, different forms of AP all exhibit sustained intracellular Ca2+ elevation as a common hallmark. The release of endoplasmic reticulum (ER) Ca2+ stores by toxins (such as bile acids or fatty acid ethyl esters (FAEEs)) or increased intrapancreatic pressure activates the influx of extracellular Ca2+ via the Orai1 Ca2+ channel, a process known as store-operated Ca2+ entry (SOCE). Intracellular Ca2+ overload can lead to premature activation of trypsinogen in pancreatic acinar cells and impaired fluid and HCO3- secretion in ductal cells. Increased and unbalanced reactive oxygen species (ROS) production caused by sustained Ca2+ elevation further contributes to cell dysfunction, leading to mitochondrial damage and cell death. Translational studies of AP identified several potential target molecules that can be modified to prevent intracellular Ca2+ overload. One of the most promising drugs, a selective inhibitor of the Orai1 channel that has been shown to inhibit extracellular Ca2+ influx and protect cells from injury, is currently being tested in clinical trials. In this review, we will summarise the recent advances in the field, with a special focus on the translational aspects of the basic findings.
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Affiliation(s)
- Petra Pallagi
- First Department of Medicine, University of Szeged, H6720 Szeged, Hungary; (P.P.); (T.M.); (Á.V.)
- HAS-USZ Momentum Epithelial Cell Signaling and Secretion Research Group, University of Szeged, H6720 Szeged, Hungary
- HCEMM-SZTE Molecular Gastroenterology Research Group, University of Szeged, H6720 Szeged, Hungary
| | - Tamara Madácsy
- First Department of Medicine, University of Szeged, H6720 Szeged, Hungary; (P.P.); (T.M.); (Á.V.)
- HAS-USZ Momentum Epithelial Cell Signaling and Secretion Research Group, University of Szeged, H6720 Szeged, Hungary
- HCEMM-SZTE Molecular Gastroenterology Research Group, University of Szeged, H6720 Szeged, Hungary
| | - Árpád Varga
- First Department of Medicine, University of Szeged, H6720 Szeged, Hungary; (P.P.); (T.M.); (Á.V.)
- HAS-USZ Momentum Epithelial Cell Signaling and Secretion Research Group, University of Szeged, H6720 Szeged, Hungary
- HCEMM-SZTE Molecular Gastroenterology Research Group, University of Szeged, H6720 Szeged, Hungary
| | - József Maléth
- First Department of Medicine, University of Szeged, H6720 Szeged, Hungary; (P.P.); (T.M.); (Á.V.)
- HAS-USZ Momentum Epithelial Cell Signaling and Secretion Research Group, University of Szeged, H6720 Szeged, Hungary
- HCEMM-SZTE Molecular Gastroenterology Research Group, University of Szeged, H6720 Szeged, Hungary
- Correspondence: or ; Tel.: +36-(62)-342-877 or +36-70-41-66500
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30
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Islam MS. Molecular Regulations and Functions of the Transient Receptor Potential Channels of the Islets of Langerhans and Insulinoma Cells. Cells 2020; 9:cells9030685. [PMID: 32168890 PMCID: PMC7140661 DOI: 10.3390/cells9030685] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Revised: 03/06/2020] [Accepted: 03/08/2020] [Indexed: 12/17/2022] Open
Abstract
Insulin secretion from the β-cells of the islets of Langerhans is triggered mainly by nutrients such as glucose, and incretin hormones such as glucagon-like peptide-1 (GLP-1). The mechanisms of the stimulus-secretion coupling involve the participation of the key enzymes that metabolize the nutrients, and numerous ion channels that mediate the electrical activity. Several members of the transient receptor potential (TRP) channels participate in the processes that mediate the electrical activities and Ca2+ oscillations in these cells. Human β-cells express TRPC1, TRPM2, TRPM3, TRPM4, TRPM7, TRPP1, TRPML1, and TRPML3 channels. Some of these channels have been reported to mediate background depolarizing currents, store-operated Ca2+ entry (SOCE), electrical activity, Ca2+ oscillations, gene transcription, cell-death, and insulin secretion in response to stimulation by glucose and GLP1. Different channels of the TRP family are regulated by one or more of the following mechanisms: activation of G protein-coupled receptors, the filling state of the endoplasmic reticulum Ca2+ store, heat, oxidative stress, or some second messengers. This review briefly compiles our current knowledge about the molecular mechanisms of regulations, and functions of the TRP channels in the β-cells, the α-cells, and some insulinoma cell lines.
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Affiliation(s)
- Md. Shahidul Islam
- Karolinska Institutet, Department of Clinical Science and Education, Södersjukhuset, Research Center, 5th floor, SE-118 83 Stockholm, Sweden;
- Department of Emergency Care and Internal Medicine, Uppsala University Hospital, Uppsala University, SE-751 85 Uppsala, Sweden
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31
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Fanczal J, Pallagi P, Görög M, Diszházi G, Almássy J, Madácsy T, Varga Á, Csernay-Biró P, Katona X, Tóth E, Molnár R, Rakonczay Z, Hegyi P, Maléth J. TRPM2-mediated extracellular Ca 2+ entry promotes acinar cell necrosis in biliary acute pancreatitis. J Physiol 2020; 598:1253-1270. [PMID: 31917868 DOI: 10.1113/jp279047] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Accepted: 12/24/2019] [Indexed: 01/05/2023] Open
Abstract
KEY POINTS Acute biliary pancreatitis is a significant clinical challenge as currently no specific pharmaceutical treatment exists. Intracellular Ca2+ overload, increased reactive oxygen species (ROS) production, mitochondrial damage and intra-acinar digestive enzyme activation caused by bile acids are hallmarks of acute biliary pancreatitis. Transient receptor potential melastatin 2 (TRPM2) is a non-selective cation channel that has recently emerged as an important contributor to oxidative-stress-induced cellular Ca2+ overload across different diseases. We demonstrated that TRPM2 is expressed in the plasma membrane of mouse pancreatic acinar and ductal cells, which can be activated by increased oxidative stress induced by H2 O2 treatment and contributed to bile acid-induced extracellular Ca2+ influx in acinar cells, which promoted acinar cell necrosis in vitro and in vivo. These results suggest that the inhibition of TRPM2 may be a potential treatment option for biliary pancreatitis. ABSTRACT Acute biliary pancreatitis poses a significant clinical challenge as currently no specific pharmaceutical treatment exists. Disturbed intracellular Ca2+ signalling caused by bile acids is a hallmark of the disease, which induces increased reactive oxygen species (ROS) production, mitochondrial damage, intra-acinar digestive enzyme activation and cell death. Because of this mechanism of action, prevention of toxic cellular Ca2+ overload is a promising therapeutic target. Transient receptor potential melastatin 2 (TRPM2) is a non-selective cation channel that has recently emerged as an important contributor to oxidative-stress-induced cellular Ca2+ overload across different diseases. However, the expression and possible functions of TRPM2 in the exocrine pancreas remain unknown. Here we found that TRPM2 is expressed in the plasma membrane of mouse pancreatic acinar and ductal cells, which can be activated by increased oxidative stress induced by H2 O2 treatment. TRPM2 activity was found to contribute to bile acid-induced extracellular Ca2+ influx in acinar cells, but did not have the same effect in ductal cells. The generation of intracellular ROS in response to bile acids was remarkably higher in pancreatic acinar cells compared to isolated ducts, which can explain the difference between acinar and ductal cells. This activity promoted acinar cell necrosis in vitro independently from mitochondrial damage or mitochondrial fragmentation. In addition, bile-acid-induced experimental pancreatitis was less severe in TRPM2 knockout mice, whereas the lack of TRPM2 had no protective effect in cerulein-induced acute pancreatitis. Our results suggest that the inhibition of TRPM2 may be a potential treatment option for biliary pancreatitis.
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Affiliation(s)
- Júlia Fanczal
- First Department of Internal Medicine, University of Szeged, Szeged, Hungary
| | - Petra Pallagi
- First Department of Internal Medicine, University of Szeged, Szeged, Hungary.,HAS-USZ Momentum Epithelial Cell Signalling and Secretion Research Group, University of Szeged, Szeged, Hungary
| | - Marietta Görög
- First Department of Internal Medicine, University of Szeged, Szeged, Hungary.,HAS-USZ Momentum Epithelial Cell Signalling and Secretion Research Group, University of Szeged, Szeged, Hungary
| | - Gyula Diszházi
- Department of Physiology, University of Debrecen, Debrecen, Hungary
| | - János Almássy
- Department of Physiology, University of Debrecen, Debrecen, Hungary
| | - Tamara Madácsy
- First Department of Internal Medicine, University of Szeged, Szeged, Hungary.,HAS-USZ Momentum Epithelial Cell Signalling and Secretion Research Group, University of Szeged, Szeged, Hungary
| | - Árpád Varga
- First Department of Internal Medicine, University of Szeged, Szeged, Hungary.,HAS-USZ Momentum Epithelial Cell Signalling and Secretion Research Group, University of Szeged, Szeged, Hungary
| | - Péter Csernay-Biró
- First Department of Internal Medicine, University of Szeged, Szeged, Hungary
| | - Xénia Katona
- First Department of Internal Medicine, University of Szeged, Szeged, Hungary.,HAS-USZ Momentum Epithelial Cell Signalling and Secretion Research Group, University of Szeged, Szeged, Hungary
| | - Emese Tóth
- First Department of Internal Medicine, University of Szeged, Szeged, Hungary
| | - Réka Molnár
- First Department of Internal Medicine, University of Szeged, Szeged, Hungary
| | - Zoltán Rakonczay
- Department of Pathophysiology, University of Szeged, Szeged, Hungary
| | - Péter Hegyi
- HAS-USZ Momentum Translational Gastroenterology Research Group, University of Szeged, Szeged, Hungary.,Institute for Translational Medicine, Medical School, University of Pécs, Pécs, Hungary
| | - József Maléth
- First Department of Internal Medicine, University of Szeged, Szeged, Hungary.,HAS-USZ Momentum Epithelial Cell Signalling and Secretion Research Group, University of Szeged, Szeged, Hungary.,Department of Public Health, University of Szeged, Szeged, Hungary
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32
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Magnone M, Emionite L, Guida L, Vigliarolo T, Sturla L, Spinelli S, Buschiazzo A, Marini C, Sambuceti G, De Flora A, Orengo AM, Cossu V, Ferrando S, Barbieri O, Zocchi E. Insulin-independent stimulation of skeletal muscle glucose uptake by low-dose abscisic acid via AMPK activation. Sci Rep 2020; 10:1454. [PMID: 31996711 PMCID: PMC6989460 DOI: 10.1038/s41598-020-58206-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Accepted: 01/07/2020] [Indexed: 02/07/2023] Open
Abstract
Abscisic acid (ABA) is a plant hormone active also in mammals where it regulates, at nanomolar concentrations, blood glucose homeostasis. Here we investigated the mechanism through which low-dose ABA controls glycemia and glucose fate. ABA stimulated uptake of the fluorescent glucose analog 2-NBDG by L6, and of [18F]-deoxy-glucose (FDG) by mouse skeletal muscle, in the absence of insulin, and both effects were abrogated by the specific AMPK inhibitor dorsomorphin. In L6, incubation with ABA increased phosphorylation of AMPK and upregulated PGC-1α expression. LANCL2 silencing reduced all these ABA-induced effects. In vivo, low-dose oral ABA stimulated glucose uptake and storage in the skeletal muscle of rats undergoing an oral glucose load, as detected by micro-PET. Chronic treatment with ABA significantly improved the AUC of glycemia and muscle glycogen content in CD1 mice exposed to a high-glucose diet. Finally, both acute and chronic ABA treatment of hypoinsulinemic TRPM2-/- mice ameliorated the glycemia profile and increased muscle glycogen storage. Altogether, these results suggest that low-dose oral ABA might be beneficial for pre-diabetic and diabetic subjects by increasing insulin-independent skeletal muscle glucose disposal through an AMPK-mediated mechanism.
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Affiliation(s)
- Mirko Magnone
- Department of Experimental Medicine, Section of Biochemistry, University of Genova, Viale Benedetto XV, 1, 16132, Genova, Italy. .,Nutravis S.r.l., Via Corsica 2/19, 16128, Genova, Italy.
| | - Laura Emionite
- Animal Facility, IRCCS Ospedale Policlinico San Martino, Largo Benzi 10, 16132, Genova, Italy
| | - Lucrezia Guida
- Department of Experimental Medicine, Section of Biochemistry, University of Genova, Viale Benedetto XV, 1, 16132, Genova, Italy
| | - Tiziana Vigliarolo
- Department of Experimental Medicine, Section of Biochemistry, University of Genova, Viale Benedetto XV, 1, 16132, Genova, Italy
| | - Laura Sturla
- Department of Experimental Medicine, Section of Biochemistry, University of Genova, Viale Benedetto XV, 1, 16132, Genova, Italy
| | - Sonia Spinelli
- Department of Experimental Medicine, Section of Biochemistry, University of Genova, Viale Benedetto XV, 1, 16132, Genova, Italy
| | - Ambra Buschiazzo
- Nuclear Medicine, IRCCS Ospedale Policlinico San Martino, Largo Benzi 10, 16132, Genova, Italy
| | - Cecilia Marini
- Nuclear Medicine, IRCCS Ospedale Policlinico San Martino, Largo Benzi 10, 16132, Genova, Italy.,CNR Institute of Bioimages and Molecular Physiology, Milan, Italy.,Department of Health Sciences, Via A. Pastore 1, Genova, Italy
| | - Gianmario Sambuceti
- Nuclear Medicine, IRCCS Ospedale Policlinico San Martino, Largo Benzi 10, 16132, Genova, Italy.,CNR Institute of Bioimages and Molecular Physiology, Milan, Italy.,Department of Health Sciences, Via A. Pastore 1, Genova, Italy
| | - Antonio De Flora
- Department of Experimental Medicine, Section of Biochemistry, University of Genova, Viale Benedetto XV, 1, 16132, Genova, Italy
| | - Anna Maria Orengo
- Nuclear Medicine, IRCCS Ospedale Policlinico San Martino, Largo Benzi 10, 16132, Genova, Italy
| | - Vanessa Cossu
- Nuclear Medicine, IRCCS Ospedale Policlinico San Martino, Largo Benzi 10, 16132, Genova, Italy
| | - Sara Ferrando
- Department of Earth, Environmental and Life Sciences, University of Genova, Corso Europa 26, Genova, Italy
| | - Ottavia Barbieri
- Animal Facility, IRCCS Ospedale Policlinico San Martino, Largo Benzi 10, 16132, Genova, Italy
| | - Elena Zocchi
- Department of Experimental Medicine, Section of Biochemistry, University of Genova, Viale Benedetto XV, 1, 16132, Genova, Italy.
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Huang Y, Roth B, Lü W, Du J. Ligand recognition and gating mechanism through three ligand-binding sites of human TRPM2 channel. eLife 2019; 8:50175. [PMID: 31513012 PMCID: PMC6759353 DOI: 10.7554/elife.50175] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Accepted: 09/11/2019] [Indexed: 12/17/2022] Open
Abstract
TRPM2 is critically involved in diverse physiological processes including core temperature sensing, apoptosis, and immune response. TRPM2’s activation by Ca2+ and ADP ribose (ADPR), an NAD+-metabolite produced under oxidative stress and neurodegenerative conditions, suggests a role in neurological disorders. We provide a central concept between triple-site ligand binding and the channel gating of human TRPM2. We show consecutive structural rearrangements and channel activation of TRPM2 induced by binding of ADPR in two indispensable locations, and the binding of Ca2+ in the transmembrane domain. The 8-Br-cADPR—an antagonist of cADPR—binds only to the MHR1/2 domain and inhibits TRPM2 by stabilizing the channel in an apo-like conformation. We conclude that MHR1/2 acts as a orthostatic ligand-binding site for TRPM2. The NUDT9-H domain binds to a second ADPR to assist channel activation in vertebrates, but not necessary in invertebrates. Our work provides insights into the gating mechanism of human TRPM2 and its pharmacology.
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Affiliation(s)
- Yihe Huang
- Van Andel Institute, Grand Rapids, United States
| | - Becca Roth
- Van Andel Institute, Grand Rapids, United States
| | - Wei Lü
- Van Andel Institute, Grand Rapids, United States
| | - Juan Du
- Van Andel Institute, Grand Rapids, United States
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Miller BA, Wang J, Song J, Zhang XQ, Hirschler-Laszkiewicz I, Shanmughapriya S, Tomar D, Rajan S, Feldman AM, Madesh M, Sheu SS, Cheung JY. Trpm2 enhances physiological bioenergetics and protects against pathological oxidative cardiac injury: Role of Pyk2 phosphorylation. J Cell Physiol 2019; 234:15048-15060. [PMID: 30637731 PMCID: PMC6626587 DOI: 10.1002/jcp.28146] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 01/03/2019] [Indexed: 01/25/2023]
Abstract
The mechanisms by which Trpm2 channels enhance mitochondrial bioenergetics and protect against oxidative stress-induced cardiac injury remain unclear. Here, the role of proline-rich tyrosine kinase 2 (Pyk2) in Trpm2 signaling is explored. Activation of Trpm2 in adult myocytes with H2 O2 resulted in 10- to 21-fold increases in Pyk2 phosphorylation in wild-type (WT) myocytes which was significantly lower (~40%) in Trpm2 knockout (KO) myocytes. Pyk2 phosphorylation was inhibited (~54%) by the Trpm2 blocker clotrimazole. Buffering Trpm2-mediated Ca2+ increase with 1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid (BAPTA) resulted in significantly reduced pPyk2 in WT but not in KO myocytes, indicating Ca2+ influx through activated Trpm2 channels phosphorylated Pyk2. Part of phosphorylated Pyk2 translocated from cytosol to mitochondria which has been previously shown to augment mitochondrial Ca2+ uptake and enhance adenosine triphosphate generation. Although Trpm2-mediated Ca2+ influx phosphorylated Ca2+ -calmodulin kinase II (CaMKII), the CaMKII inhibitor KN93 did not significantly affect Pyk2 phosphorylation in H2 O2 -treated WT myocytes. After ischemia/reperfusion (I/R), Pyk2 phosphorylation and its downstream prosurvival signaling molecules (pERK1/2 and pAkt) were significantly lower in KO-I/R when compared with WT-I/R hearts. After hypoxia/reoxygenation, mitochondrial membrane potential was lower and superoxide level was higher in KO myocytes, and were restored to WT values by the mitochondria-targeted superoxide scavenger MitoTempo. Our results suggested that Ca2+ influx via tonically activated Trpm2 phosphorylated Pyk2, part of which translocated to mitochondria, resulting in better mitochondrial bioenergetics to maintain cardiac health. After I/R, Pyk2 activated prosurvival signaling molecules and prevented excessive increases in reactive oxygen species, thereby affording protection from I/R injury.
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Affiliation(s)
- Barbara A. Miller
- Department of Pediatrics, The Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033
| | - JuFang Wang
- Center of Translational Medicine, Lewis Katz School of Medicine of Temple University, Philadelphia, PA 19140
| | - Jianliang Song
- Center of Translational Medicine, Lewis Katz School of Medicine of Temple University, Philadelphia, PA 19140
| | - Xue-Qian Zhang
- Center of Translational Medicine, Lewis Katz School of Medicine of Temple University, Philadelphia, PA 19140
| | - Iwona Hirschler-Laszkiewicz
- Department of Pediatrics, The Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033
| | - Santhanam Shanmughapriya
- Center of Translational Medicine, Lewis Katz School of Medicine of Temple University, Philadelphia, PA 19140,Department of Biochemistry, Lewis Katz School of Medicine of Temple University, Philadelphia, PA 19140
| | - Dhanendra Tomar
- Center of Translational Medicine, Lewis Katz School of Medicine of Temple University, Philadelphia, PA 19140,Department of Biochemistry, Lewis Katz School of Medicine of Temple University, Philadelphia, PA 19140
| | - Sudasan Rajan
- Center of Translational Medicine, Lewis Katz School of Medicine of Temple University, Philadelphia, PA 19140,Department of Biochemistry, Lewis Katz School of Medicine of Temple University, Philadelphia, PA 19140
| | - Arthur M. Feldman
- Department of Medicine, Lewis Katz School of Medicine of Temple University, Philadelphia, PA 19140
| | - Muniswamy Madesh
- Center of Translational Medicine, Lewis Katz School of Medicine of Temple University, Philadelphia, PA 19140,Department of Biochemistry, Lewis Katz School of Medicine of Temple University, Philadelphia, PA 19140
| | - Shey-Shing Sheu
- Center for Translational Medicine, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania 19107
| | - Joseph Y. Cheung
- Center of Translational Medicine, Lewis Katz School of Medicine of Temple University, Philadelphia, PA 19140,Department of Medicine, Lewis Katz School of Medicine of Temple University, Philadelphia, PA 19140
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35
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Yin Y, Wu M, Hsu AL, Borschel WF, Borgnia MJ, Lander GC, Lee SY. Visualizing structural transitions of ligand-dependent gating of the TRPM2 channel. Nat Commun 2019; 10:3740. [PMID: 31431622 PMCID: PMC6702222 DOI: 10.1038/s41467-019-11733-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 07/31/2019] [Indexed: 12/20/2022] Open
Abstract
The transient receptor potential melastatin 2 (TRPM2) channel plays a key role in redox sensation in many cell types. Channel activation requires binding of both ADP-ribose (ADPR) and Ca2+. The recently published TRPM2 structures from Danio rerio in the ligand-free and the ADPR/Ca2+-bound conditions represent the channel in closed and open states, which uncovered substantial tertiary and quaternary conformational rearrangements. However, it is unclear how these rearrangements are achieved within the tetrameric channel during channel gating. Here we report the cryo-electron microscopy structures of Danio rerio TRPM2 in the absence of ligands, in complex with Ca2+ alone, and with both ADPR and Ca2+, resolved to ~4.3 Å, ~3.8 Å, and ~4.2 Å, respectively. In contrast to the published results, our studies capture ligand-bound TRPM2 structures in two-fold symmetric intermediate states, offering a glimpse of the structural transitions that bridge the closed and open conformations. The transient receptor potential channel member 2 (TRPM2) ion channel has a function in redox-dependent signaling. Here the authors present the cryo-EM structures of zebrafish TRPM2 in the ligand-free form, with Ca2+ and both ADP-ribose/Ca2+ and observe two-fold symmetric quaternary structure rearrangements in the ligand-bound structures that likely represent intermediate gating states.
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Affiliation(s)
- Ying Yin
- Department of Biochemistry, Duke University School of Medicine, Durham, NC, 27710, USA
| | - Mengyu Wu
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, 92037, USA
| | - Allen L Hsu
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC, 27709, USA
| | - William F Borschel
- Department of Biochemistry, Duke University School of Medicine, Durham, NC, 27710, USA
| | - Mario J Borgnia
- Department of Biochemistry, Duke University School of Medicine, Durham, NC, 27710, USA.,Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC, 27709, USA
| | - Gabriel C Lander
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, 92037, USA
| | - Seok-Yong Lee
- Department of Biochemistry, Duke University School of Medicine, Durham, NC, 27710, USA.
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36
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Sarmiento BE, Santos Menezes LF, Schwartz EF. Insulin Release Mechanism Modulated by Toxins Isolated from Animal Venoms: From Basic Research to Drug Development Prospects. Molecules 2019; 24:E1846. [PMID: 31091684 PMCID: PMC6571724 DOI: 10.3390/molecules24101846] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 04/23/2019] [Accepted: 05/09/2019] [Indexed: 12/12/2022] Open
Abstract
Venom from mammals, amphibians, snakes, arachnids, sea anemones and insects provides diverse sources of peptides with different potential medical applications. Several of these peptides have already been converted into drugs and some are still in the clinical phase. Diabetes type 2 is one of the diseases with the highest mortality rate worldwide, requiring specific attention. Diverse drugs are available (e.g., Sulfonylureas) for effective treatment, but with several adverse secondary effects, most of them related to the low specificity of these compounds to the target. In this context, the search for specific and high-affinity compounds for the management of this metabolic disease is growing. Toxins isolated from animal venom have high specificity and affinity for different molecular targets, of which the most important are ion channels. This review will present an overview about the electrical activity of the ion channels present in pancreatic β cells that are involved in the insulin secretion process, in addition to the diversity of peptides that can interact and modulate the electrical activity of pancreatic β cells. The importance of prospecting bioactive peptides for therapeutic use is also reinforced.
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Affiliation(s)
- Beatriz Elena Sarmiento
- Departamento de Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, DF 70910-900, Brazil.
| | - Luis Felipe Santos Menezes
- Departamento de Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, DF 70910-900, Brazil.
| | - Elisabeth F Schwartz
- Departamento de Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, DF 70910-900, Brazil.
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37
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Redox TRPs in diabetes and diabetic complications: Mechanisms and pharmacological modulation. Pharmacol Res 2019; 146:104271. [PMID: 31096011 DOI: 10.1016/j.phrs.2019.104271] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 04/04/2019] [Accepted: 05/08/2019] [Indexed: 12/12/2022]
Abstract
Transient receptor potential (TRP) channels have shown to be involved in a wide variety of physiological functions and pathophysiological conditions. Modulation of TRP channels reported to play a major role in number of disorders starting from central nervous system related disorders to cardiovascular, inflammatory, cancer, gastrointestinal and metabolic diseases. Recently, a subset of TRP ion channels called redox TRPs gained importance on account of their ability to sense the cellular redox environment and respond accordingly to such redox stimuli. Diabetes, the silent epidemic of the world is increasing at an alarming rate in spite of novel therapeutic interventions. Moreover, diabetes and its associated complications are reported to arise due to a change in oxidative status of cell induced by hyperglycemia. Such a change in cellular oxidative status can modulate the activities of various redox TRP channels (TRPA1, TRPC5, TRPMs and TRPV1). Targeting redox TRPs have potential in diabetes and diabetic complications like neuropathy, cardiomyopathy, retinopathy, cystopathy, and encephalopathy. Thus in this review, we have discussed the activities of different redox sensing TRPs in diabetes and diabetic complications and how they can be modulated pharmacologically, so as to consider them a potential novel therapeutic target in treating diabetes and its comorbidity.
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38
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Iordanov I, Tóth B, Szollosi A, Csanády L. Enzyme activity and selectivity filter stability of ancient TRPM2 channels were simultaneously lost in early vertebrates. eLife 2019; 8:44556. [PMID: 30938679 PMCID: PMC6461439 DOI: 10.7554/elife.44556] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Accepted: 04/01/2019] [Indexed: 01/01/2023] Open
Abstract
Transient Receptor Potential Melastatin 2 (TRPM2) is a cation channel important for the immune response, insulin secretion, and body temperature regulation. It is activated by cytosolic ADP ribose (ADPR) and contains a nudix-type motif 9 (NUDT9)-homology (NUDT9-H) domain homologous to ADPR phosphohydrolases (ADPRases). Human TRPM2 (hsTRPM2) is catalytically inactive due to mutations in the conserved Nudix box sequence. Here, we show that TRPM2 Nudix motifs are canonical in all invertebrates but vestigial in vertebrates. Correspondingly, TRPM2 of the cnidarian Nematostella vectensis (nvTRPM2) and the choanoflagellate Salpingoeca rosetta (srTRPM2) are active ADPRases. Disruption of ADPRase activity fails to affect nvTRPM2 channel currents, reporting a catalytic cycle uncoupled from gating. Furthermore, pore sequence substitutions responsible for inactivation of hsTRPM2 also appeared in vertebrates. Correspondingly, zebrafish (Danio rerio) TRPM2 (drTRPM2) and hsTRPM2 channels inactivate, but srTRPM2 and nvTRPM2 currents are stable. Thus, catalysis and pore stability were lost simultaneously in vertebrate TRPM2 channels.
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Affiliation(s)
- Iordan Iordanov
- Department of Medical Biochemistry, Semmelweis University, Budapest, Hungary.,MTA-SE Lendület Ion Channel Research Group, Semmelweis University, Budapest, Hungary
| | - Balázs Tóth
- Department of Medical Biochemistry, Semmelweis University, Budapest, Hungary.,MTA-SE Lendület Ion Channel Research Group, Semmelweis University, Budapest, Hungary
| | - Andras Szollosi
- Department of Medical Biochemistry, Semmelweis University, Budapest, Hungary.,MTA-SE Lendület Ion Channel Research Group, Semmelweis University, Budapest, Hungary
| | - László Csanády
- Department of Medical Biochemistry, Semmelweis University, Budapest, Hungary.,MTA-SE Lendület Ion Channel Research Group, Semmelweis University, Budapest, Hungary
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39
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An incretin-based tri-agonist promotes superior insulin secretion from murine pancreatic islets via PLC activation. Cell Signal 2018; 51:13-22. [DOI: 10.1016/j.cellsig.2018.07.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Revised: 07/24/2018] [Accepted: 07/24/2018] [Indexed: 01/22/2023]
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40
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Andoh C, Nishitani N, Hashimoto E, Nagai Y, Takao K, Miyakawa T, Nakagawa T, Mori Y, Nagayasu K, Shirakawa H, Kaneko S. TRPM2 confers susceptibility to social stress but is essential for behavioral flexibility. Brain Res 2018; 1704:68-77. [PMID: 30273551 DOI: 10.1016/j.brainres.2018.09.031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Revised: 09/19/2018] [Accepted: 09/21/2018] [Indexed: 12/12/2022]
Abstract
Transient receptor potential melastatin 2 (TRPM2) is a Ca2+-permeable, nonselective cation channel and a member of the TRP channel superfamily that acts as a sensor of intracellular redox states. TRPM2 is widely distributed in many tissues and highly expressed in the brain, but the physiological roles of TRPM2 in the central nervous system remain unclear. In this study, TRPM2-deficient mice were examined in a series of behavioral tests. TRPM2-deficient mice did not significantly differ from wild-type littermates in muscle strength, light/dark transition test, rotarod, elevated plus maze, social interaction, prepulse inhibition, Y-maze, forced swim test, cued and contextual fear conditioning, and tail suspension test. In the Barnes circular maze, TRPM2-deficient mice learned the fixed escape box position at similar extent to wild-type littermates, suggesting normal reference memory. However, performance of the first reversal trial and probe test were significantly impaired in TRPM2-deficient mice. In the T-maze delayed alternation task, TRPM2 deficiency significantly reduced choice accuracy. These results indicate that TRPM2-deficient mice shows behavioral inflexibility. Meanwhile, social avoidance induced by repeated social defeat stress was significantly attenuated in TRPM2-deficient mice, suggesting that TRPM2 deficiency confers stress resiliency. Our findings indicate that TRPM2 plays an essential role in maintaining behavioral flexibility but it increases susceptibility to stress.
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Affiliation(s)
- Chihiro Andoh
- Department of Molecular Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
| | - Naoya Nishitani
- Department of Molecular Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
| | - Emina Hashimoto
- Department of Molecular Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
| | - Yuma Nagai
- Department of Molecular Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
| | - Keizo Takao
- Center for Genetic Analysis of Behavior, National Institute for Physiological Sciences, Okazaki, Japan; Life Science Research Center, University of Toyama, Toyama, Japan
| | - Tsuyoshi Miyakawa
- Center for Genetic Analysis of Behavior, National Institute for Physiological Sciences, Okazaki, Japan; Division of Systems Medical Science, Institute for Comprehensive Medical Science, Fujita Health University, Toyoake, Japan
| | - Takayuki Nakagawa
- Department of Clinical Pharmacology and Therapeutics, Kyoto University Hospital, Kyoto, Japan
| | - Yasuo Mori
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, Japan
| | - Kazuki Nagayasu
- Department of Molecular Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
| | - Hisashi Shirakawa
- Department of Molecular Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan.
| | - Shuji Kaneko
- Department of Molecular Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
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41
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Thei L, Imm J, Kaisis E, Dallas ML, Kerrigan TL. Microglia in Alzheimer's Disease: A Role for Ion Channels. Front Neurosci 2018; 12:676. [PMID: 30323735 PMCID: PMC6172337 DOI: 10.3389/fnins.2018.00676] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Accepted: 09/07/2018] [Indexed: 12/11/2022] Open
Abstract
Alzheimer's disease is the most common form of dementia, it is estimated to affect over 40 million people worldwide. Classically, the disease has been characterized by the neuropathological hallmarks of aggregated extracellular amyloid-β and intracellular paired helical filaments of hyperphosphorylated tau. A wealth of evidence indicates a pivotal role for the innate immune system, such as microglia, and inflammation in the pathology of Alzheimer's disease. The over production and aggregation of Alzheimer's associated proteins results in chronic inflammation and disrupts microglial clearance of these depositions. Despite being non-excitable, microglia express a diverse array of ion channels which shape their physiological functions. In support of this, there is a growing body of evidence pointing to the involvement of microglial ion channels contributing to neurodegenerative diseases such as Alzheimer's disease. In this review, we discuss the evidence for an array of microglia ion channels and their importance in modulating microglial homeostasis and how this process could be disrupted in Alzheimer's disease. One promising avenue for assessing the role that microglia play in the initiation and progression of Alzheimer's disease is through using induced pluripotent stem cell derived microglia. Here, we examine what is already understood in terms of the molecular underpinnings of inflammation in Alzheimer's disease, and the utility that inducible pluripotent stem cell derived microglia may have to advance this knowledge. We outline the variability that occurs between the use of animal and human models with regards to the importance of microglial ion channels in generating a relevant functional model of brain inflammation. Overcoming these hurdles will be pivotal in order to develop new drug targets and progress our understanding of the pathological mechanisms involved in Alzheimer's disease.
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Affiliation(s)
- Laura Thei
- Reading School of Pharmacy, University of Reading, Reading, United Kingdom
| | - Jennifer Imm
- University of Exeter Medical School, University of Exeter, Exeter, United Kingdom
| | - Eleni Kaisis
- Reading School of Pharmacy, University of Reading, Reading, United Kingdom
| | - Mark L Dallas
- Reading School of Pharmacy, University of Reading, Reading, United Kingdom
| | - Talitha L Kerrigan
- University of Exeter Medical School, University of Exeter, Exeter, United Kingdom
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42
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Gao M, Du Y, Xie JW, Xue J, Wang YT, Qin L, Ma MM, Tang YB, Li XY. Redox signal-mediated TRPM2 promotes Ang II-induced adipocyte insulin resistance via Ca 2+-dependent CaMKII/JNK cascade. Metabolism 2018; 85:313-324. [PMID: 29775644 DOI: 10.1016/j.metabol.2018.05.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Revised: 04/21/2018] [Accepted: 05/11/2018] [Indexed: 10/16/2022]
Abstract
BACKGROUND AND OBJECTIVE Redox-sensitive transient receptor potential melastatin 2 (TRPM2) is a Ca2+-permeable, nonselective cation channel which plays a crucial role in various physiological processes. However, little is known whether TRPM2 is involved in adipocyte dysfunction during hypertension. In the present study, we determined the role of TRPM2 in angiotensin II (Ang II)-induced insulin resistance in adipocytes and the underlying mechanisms. METHODS Ang II-induced adipocyte insulin resistant model was conducted. Data from Ang II-induced hypertensive mice were used to measure the effects of TRPM2 inhibitor on insulin resistance in vivo. Whole-cell patch clamp technique, intracellular Ca2+ concentration measurement, glucose uptake assay, western blot, cDNA and siRNA transfection were employed to investigate the TRPM2/Ca2+/CaMKII/JNK signaling. RESULTS Ang II rose a cation current similar to that activated by hydrogen peroxide (H2O2) or ADP-ribose (ADPR), which was blocked by TRPM2 inhibitor or TRPM2 siRNA in adipocytes. Knockdown of TRPM2 significantly improved the lowered insulin sensitivity induced by Ang II, including insulin stimulated glucose uptake, phosphorylation of IRS1 and Akt, interaction between IR and IRS1 and the membrane translocation of GLUT4, whereas overexpression of TRPM2 resulted in the opposite effects. These results were related to the potentiated effects of TRPM2 on Ca2+ influx and CaMKII/JNK cascade activation upon Ang II-induced challenge. Notably, the pharmacological TRPM2 inhibitor, N-(p-amylcinnamoyl)anthranilic acid (ACA), was proved to improve insulin sensitivity in adipose tissue during Ang II-induced hypertension progress. CONCLUSIONS These data suggested that TRPM2 is a positive regulator of Ang II-induced adipocyte insulin resistance via Ca2+/CaMKII/JNK-dependent signaling pathway. Targeting TRPM2 may be a novel therapeutic strategy to treat hypertension-associated insulin resistance.
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Affiliation(s)
- Min Gao
- Department of Pharmacy, the Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China.
| | - Yu Du
- Guangdong Provincial Key Laboratory of Liver Disease Research, Cell-gene Therapy Translational Medicine Research Center, The Third Affiliated Hospital, Sun Yat-sen University, Guangzhou 510630, China
| | - Jing-Wen Xie
- Department of Pharmacy, the Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
| | - Jing Xue
- Department of Pharmacy, the Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
| | - Yi-Ting Wang
- Department of Pharmacy, the Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
| | - Li Qin
- Department of Pharmacy, the Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
| | - Ming-Ming Ma
- Department of Pharmacology, Cardiac and Cerebral Vascular Research Center, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou 510080, China
| | - Yong-Bo Tang
- Department of Pharmacology, Cardiac and Cerebral Vascular Research Center, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou 510080, China
| | - Xiao-Yan Li
- Department of Pharmacy, the Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China.
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43
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Sita G, Hrelia P, Graziosi A, Ravegnini G, Morroni F. TRPM2 in the Brain: Role in Health and Disease. Cells 2018; 7:cells7070082. [PMID: 30037128 PMCID: PMC6070997 DOI: 10.3390/cells7070082] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 07/10/2018] [Accepted: 07/20/2018] [Indexed: 01/02/2023] Open
Abstract
Transient receptor potential (TRP) proteins have been implicated in several cell functions as non-selective cation channels, with about 30 different mammalian TRP channels having been recognized. Among them, TRP-melastatin 2 (TRPM2) is particularly involved in the response to oxidative stress and inflammation, while its activity depends on the presence of intracellular calcium (Ca2+). TRPM2 is involved in several physiological and pathological processes in the brain through the modulation of multiple signaling pathways. The aim of the present review is to provide a brief summary of the current insights of TRPM2 role in health and disease to focalize our attention on future potential neuroprotective strategies.
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Affiliation(s)
- Giulia Sita
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum, University of Bologna, Via Irnerio 48, 40126 Bologna, Italy.
| | - Patrizia Hrelia
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum, University of Bologna, Via Irnerio 48, 40126 Bologna, Italy.
| | - Agnese Graziosi
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum, University of Bologna, Via Irnerio 48, 40126 Bologna, Italy.
| | - Gloria Ravegnini
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum, University of Bologna, Via Irnerio 48, 40126 Bologna, Italy.
| | - Fabiana Morroni
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum, University of Bologna, Via Irnerio 48, 40126 Bologna, Italy.
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44
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Zhang Z, Tóth B, Szollosi A, Chen J, Csanády L. Structure of a TRPM2 channel in complex with Ca 2+ explains unique gating regulation. eLife 2018; 7:36409. [PMID: 29745897 PMCID: PMC5976436 DOI: 10.7554/elife.36409] [Citation(s) in RCA: 87] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Accepted: 05/09/2018] [Indexed: 11/18/2022] Open
Abstract
Transient receptor potential melastatin 2 (TRPM2) is a Ca2+-permeable cation channel required for immune cell activation, insulin secretion, and body heat control. TRPM2 is activated by cytosolic Ca2+, phosphatidyl-inositol-4,5-bisphosphate and ADP ribose. Here, we present the ~3 Å resolution electron cryo-microscopic structure of TRPM2 from Nematostella vectensis, 63% similar in sequence to human TRPM2, in the Ca2+-bound closed state. Compared to other TRPM channels, TRPM2 exhibits unique structural features that correlate with its function. The pore is larger and more negatively charged, consistent with its high Ca2+ selectivity and larger conductance. The intracellular Ca2+ binding sites are connected to the pore and cytosol, explaining the unusual dependence of TRPM2 activity on intra- and extracellular Ca2+. In addition, the absence of a post-filter motif is likely the cause of the rapid inactivation of human TRPM2. Together, our cryo-EM and electrophysiology studies provide a molecular understanding of the unique gating mechanism of TRPM2.
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Affiliation(s)
- Zhe Zhang
- Laboratory of Membrane Biophysics and Biology, The Rockefeller University, New York, United States.,Howard Hughes Medical Institute, Chevy Chase, United States
| | - Balázs Tóth
- Department of Medical Biochemistry, Semmelweis University, Budapest, Hungary.,MTA-SE Ion Channel Research Group, Semmelweis University, Budapest, Hungary
| | - Andras Szollosi
- Department of Medical Biochemistry, Semmelweis University, Budapest, Hungary.,MTA-SE Ion Channel Research Group, Semmelweis University, Budapest, Hungary
| | - Jue Chen
- Laboratory of Membrane Biophysics and Biology, The Rockefeller University, New York, United States.,Howard Hughes Medical Institute, Chevy Chase, United States
| | - László Csanády
- Department of Medical Biochemistry, Semmelweis University, Budapest, Hungary.,MTA-SE Ion Channel Research Group, Semmelweis University, Budapest, Hungary
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45
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Belrose JC, Jackson MF. TRPM2: a candidate therapeutic target for treating neurological diseases. Acta Pharmacol Sin 2018; 39:722-732. [PMID: 29671419 PMCID: PMC5943913 DOI: 10.1038/aps.2018.31] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Accepted: 02/24/2018] [Indexed: 12/25/2022] Open
Abstract
Transient receptor potential melastatin 2 (TRPM2) is a calcium (Ca2+)-permeable non-selective cation channel belonging to the TRP ion channel family. Oxidative stress-induced TRPM2 activation provokes aberrant intracellular Ca2+ accumulation and cell death in a variety of cell types, including neurons. Aberrant TRPM2 function has been implicated in several neurological disorders including ischemia/stroke, Alzheimer's disease, neuropathic pain, Parkinson's disease and bipolar disorder. In addition to research identifying a role for TRPM2 in disease, progress has been made in the identification of physiological functions of TRPM2 in the brain, including recent evidence that TRPM2 is necessary for the induction of N-methyl-D-aspartate (NMDA) receptor-dependent long-term depression, an important form of synaptic plasticity at glutamate synapses. Here, we summarize recent evidence on the role of TRPM2 in the central nervous system (CNS) in health and disease and discuss the potential therapeutic implications of targeting TRPM2. Collectively, these studies suggest that TRPM2 represents a prospective novel therapeutic target for neurological disorders.
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Affiliation(s)
- Jillian Corinne Belrose
- Department of Anesthesia & Perioperative Medicine, Schulich Medicine & Dentistry, Western University, London, Ontario, N6A 5A5, Canada
- E-mail
| | - Michael Frederick Jackson
- Department of Pharmacology and Therapeutics, Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba, R3E 0T6, Canada
- Neuroscience Research Program, Kleysen Institute for Advanced Medicine, Health Sciences Centre, Winnipeg, Manitoba, R3E 3J7, Canada
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46
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Ca 2+ Regulation of TRP Ion Channels. Int J Mol Sci 2018; 19:ijms19041256. [PMID: 29690581 PMCID: PMC5979445 DOI: 10.3390/ijms19041256] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 04/16/2018] [Accepted: 04/17/2018] [Indexed: 12/20/2022] Open
Abstract
Ca2+ signaling influences nearly every aspect of cellular life. Transient receptor potential (TRP) ion channels have emerged as cellular sensors for thermal, chemical and mechanical stimuli and are major contributors to Ca2+ signaling, playing an important role in diverse physiological and pathological processes. Notably, TRP ion channels are also one of the major downstream targets of Ca2+ signaling initiated either from TRP channels themselves or from various other sources, such as G-protein coupled receptors, giving rise to feedback regulation. TRP channels therefore function like integrators of Ca2+ signaling. A growing body of research has demonstrated different modes of Ca2+-dependent regulation of TRP ion channels and the underlying mechanisms. However, the precise actions of Ca2+ in the modulation of TRP ion channels remain elusive. Advances in Ca2+ regulation of TRP channels are critical to our understanding of the diversified functions of TRP channels and complex Ca2+ signaling.
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47
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Lee SH, Kim BJ, Park DR, Kim UH. Exercise induces muscle fiber type switching via transient receptor potential melastatin 2-dependent Ca 2+ signaling. J Appl Physiol (1985) 2018; 124:364-373. [PMID: 29146687 DOI: 10.1152/japplphysiol.00687.2017] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The aim of the present study was to examine whether transient receptor potential melastatin 2 (TRPM2) plays a role in muscle fiber-type transition during exercise. Mice were trained at a speed of 12 m/min at a slope of 0° for 60 min for 5 consecutive days/wk for 4 wk. Exhaustion tests were performed on the treadmill (the speed was set at 6 m/min at a slope of 0° and increased at a rate of 1 m/min every 6 min). Isolated primary skeletal muscle cells from TRPM2-knockout (KO) mice showed lower amplitudes of electrical stimuli (ES)-induced Ca2+ signals when compared with wild-type (WT) mice due to a defect in Ca2+ influx. Moreover, TRPM2-KO mice had a higher proportion of fast-twitch skeletal muscle fibers and a lower proportion of slow-twitch muscle fibers before exercise than WT mice. After exercise, the expression of slow-twitch skeletal muscle fibers was increased only in WT mice but not in TRPM2-KO mice. ES-induced nuclear translocation of the Ca2+-dependent transcription factor NFATc1 was significantly lower in TRPM2-KO mice than in WT mice. TRPM2-KO mice also showed decreased mitochondrial Ca2+ and membrane potential. Lactate levels were higher in the skeletal muscle cells of TRPM2-KO mice before and after ES compared with WT mice. Collectively, these data indicate that TRPM2-mediated Ca2+ signaling plays a critical role in the regulation of fiber-type switching and mitochondrial function in skeletal muscle. NEW & NOTEWORTHY TRPM2 has been shown to play an important role in a variety of cellular functions. However, the role of TRPM2 in skeletal muscle remains poorly understood. Here, we provide evidence that TRPM2-mediated Ca2+ signaling is required for training-induced improvement in skeletal muscle mitochondrial function and fiber type transition.
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Affiliation(s)
- Seo-Ho Lee
- Department of Biochemistry, Chonbuk National University Medical School, Jeon-ju, South Korea.,National Creative Research Laboratory for Ca2+ Signaling Network, Chonbuk National University Medical School, Jeon-ju, South Korea
| | - Byung-Ju Kim
- Department of Biochemistry, Chonbuk National University Medical School, Jeon-ju, South Korea.,National Creative Research Laboratory for Ca2+ Signaling Network, Chonbuk National University Medical School, Jeon-ju, South Korea
| | - Dae-Ryoung Park
- Department of Biochemistry, Chonbuk National University Medical School, Jeon-ju, South Korea.,National Creative Research Laboratory for Ca2+ Signaling Network, Chonbuk National University Medical School, Jeon-ju, South Korea
| | - Uh-Hyun Kim
- Department of Biochemistry, Chonbuk National University Medical School, Jeon-ju, South Korea.,National Creative Research Laboratory for Ca2+ Signaling Network, Chonbuk National University Medical School, Jeon-ju, South Korea.,Institute of Cardiovascular Research, Chonbuk National University Medical School, Jeon-ju, South Korea
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48
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Luo X, Li M, Zhan K, Yang W, Zhang L, Wang K, Yu P, Zhang L. Selective inhibition of TRPM2 channel by two novel synthesized ADPR analogues. Chem Biol Drug Des 2018; 91:552-566. [PMID: 29034580 PMCID: PMC5813235 DOI: 10.1111/cbdd.13119] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Revised: 07/04/2017] [Accepted: 08/21/2017] [Indexed: 01/02/2023]
Abstract
Transient receptor potential melastatin-2 (TRPM2) channel critical for monitoring internal body temperature is implicated in the pathological processes such as neurodegeneration. However, lacking selective and potent TRPM2 inhibitors impedes investigation and validation of the channel as a drug target. To discover novel and selective TRPM2 inhibitors, a series of adenosine 5'-diphosphoribose analogues were synthesized, and their activities and selectivity were evaluated. Whole-cell patch-clamp recordings were employed for screen and evaluation of synthesized compounds. Two compounds, 7i and 8a, were identified as TRPM2 inhibitors with IC50 of 5.7 and 5.4 μm, respectively. Both 7i and 8a inhibited TRPM2 current without affecting TRPM7, TRPM8, TRPV1 and TRPV3. These two TRPM2 inhibitors can serve as new pharmacological tools for further investigation and validation of TRPM2 channel as a drug target, and the summarized structure-activity relationship (SAR) may also provide insights into further improving existing inhibitors as potential lead compounds.
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Affiliation(s)
- Xiao Luo
- State Key Laboratory of Natural and Biomimetic DrugsPeking UniversityBeijingChina
| | - Meng Li
- Department of NeurobiologyNeuroscience Research InstitutePeking University Health Science CenterPeking University School of Pharmaceutical SciencesBeijingChina
| | - Kaiyu Zhan
- Department of NeurobiologyZhejiang University School of MedicineHangzhouZhejiangChina
| | - Wei Yang
- Department of NeurobiologyZhejiang University School of MedicineHangzhouZhejiangChina
| | - Lihe Zhang
- State Key Laboratory of Natural and Biomimetic DrugsPeking UniversityBeijingChina
| | - KeWei Wang
- Department of NeurobiologyNeuroscience Research InstitutePeking University Health Science CenterPeking University School of Pharmaceutical SciencesBeijingChina
- Department of PharmacologySchool of PharmacyQingdao UniversityQingdaoChina
| | - Peilin Yu
- Department of ToxicologySchool of Public HealthZhejiang UniversityHangzhouZhejiangChina
| | - Liangren Zhang
- State Key Laboratory of Natural and Biomimetic DrugsPeking UniversityBeijingChina
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49
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Almasi S, Kennedy BE, El-Aghil M, Sterea AM, Gujar S, Partida-Sánchez S, El Hiani Y. TRPM2 channel-mediated regulation of autophagy maintains mitochondrial function and promotes gastric cancer cell survival via the JNK-signaling pathway. J Biol Chem 2018; 293:3637-3650. [PMID: 29343514 DOI: 10.1074/jbc.m117.817635] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 12/22/2017] [Indexed: 12/16/2022] Open
Abstract
A lack of effective treatment is one of the main factors contributing to gastric cancer-related death. Discovering effective targets and understanding their underlying anti-cancer mechanism are key to achieving the best response to treatment and to limiting side effects. Although recent studies have shown that the cation channel transient receptor potential melastatin-2 (TRPM2) is crucial for cancer cell survival, the exact mechanism remains unclear, limiting its therapeutic potential. Here, using molecular and functional assays, we investigated the role of TRPM2 in survival of gastric cancer cells. Our results indicated that TRPM2 knockdown in AGS and MKN-45 cells decreases cell proliferation and enhances apoptosis. We also observed that the TRPM2 knockdown impairs mitochondrial metabolism, indicated by a decrease in basal and maximal mitochondrial oxygen consumption rates and ATP production. These mitochondrial defects coincided with a decrease in autophagy and mitophagy, indicated by reduced levels of autophagy- and mitophagy-associated proteins (i.e. ATGs, LC3A/B II, and BNIP3). Moreover, we found that TRPM2 modulates autophagy through a c-Jun N-terminal kinase (JNK)-dependent and mechanistic target of rapamycin-independent pathway. We conclude that in the absence of TRPM2, down-regulation of the JNK-signaling pathway impairs autophagy, ultimately causing the accumulation of damaged mitochondria and death of gastric cancer cells. Of note, by inhibiting cell proliferation and promoting apoptosis, the TRPM2 down-regulation enhanced the efficacy of paclitaxel and doxorubicin in gastric cancer cells. Collectively, we provide compelling evidence that TRPM2 inhibition may benefit therapeutic approaches for managing gastric cancer.
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Affiliation(s)
| | | | | | - Andra M Sterea
- Physiology, Biophysics Faculty of Life Science, Dalhousie University, Halifax and
| | - Shashi Gujar
- Pathology.,Microbiology and Immunology, and.,the Centre for Innovative and Collaborative Health Services Research, Quality and System Performance, IWK Health Centre, Halifax, Nova Scotia B3H 4R2, Canada
| | - Santiago Partida-Sánchez
- Center for Microbial Pathogenesis, Research Institute at Nationwide Children's Hospital and.,the Department of Pediatrics, College of Medicine, Ohio State University, Columbus, Ohio 43205
| | - Yassine El Hiani
- Physiology, Biophysics Faculty of Life Science, Dalhousie University, Halifax and
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50
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Thiel G, Rubil S, Lesch A, Guethlein LA, Rössler OG. Transient receptor potential TRPM3 channels: Pharmacology, signaling, and biological functions. Pharmacol Res 2017; 124:92-99. [DOI: 10.1016/j.phrs.2017.07.014] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 07/12/2017] [Accepted: 07/12/2017] [Indexed: 12/13/2022]
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