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https://www.readbyqxmd.com/read/28101241/potential-role-of-melastatin-related-transient-receptor-potential-cation-channel-subfamily-m-gene-expression-in-the-pathogenesis-of-urinary-bladder-cancer
#1
Gülay Güleç Ceylan, Ebru Etem Önalan, Tuncay Kuloğlu, Gülten Aydoğ, İbrahim Keleş, Şenol Tonyali, Cavit Ceylan
Urinary bladder cancer is one of the most common malignancies of the urinary tract. Ion channels and calcium homeostasis are involved in almost all basic cellular mechanisms. The transient receptor potential cation channel subfamily M (TRPM) takes its name from the melastatin protein, which is classified as potential tumor suppressor. To the best of our knowledge, there have been no previous studies in the literature investigating the role of these ion channels in bladder cancer. The present study aimed to determine whether bladder cancer is associated with mRNA expression levels of TRPM ion channel genes, and whether there is the potential to conduct further studies to establish novel treatment modalities...
December 2016: Oncology Letters
https://www.readbyqxmd.com/read/28097390/a-role-of-plc-pkc-dependent-pathway-in-glp-1-stimulated-insulin-secretion
#2
REVIEW
Makoto Shigeto, Chae Young Cha, Patrik Rorsman, Kohei Kaku
Glucagon-like peptide-1 (GLP-1) is an endogenous glucose-lowering hormone and GLP-1 receptor agonists are currently being used as antidiabetic drugs clinically. The canonical signalling pathway (including cAMP, Epac2, protein kinase A (PKA) and KATP channels) is almost universally accepted as the main mechanism of GLP-1-stimulated insulin secretion. This belief is based on in vitro studies that used nanomolar (1-100 nM) concentrations of GLP-1. Recently, it was found that the physiological concentrations (1-10 pM) of GLP-1 also stimulate insulin secretion from isolated islets, induce membrane depolarization and increase of intracellular [Ca(2+)] in isolated β cells/pancreatic islets...
January 17, 2017: Journal of Molecular Medicine: Official Organ of the "Gesellschaft Deutscher Naturforscher und Ärzte"
https://www.readbyqxmd.com/read/28077439/the-functional-expression-of-transient-receptor-potential-channels-in-the-mouse-endometrium
#3
Katrien De Clercq, Charlotte Van den Eynde, Aurélie Hennes, Rieta Van Bree, Thomas Voets, Joris Vriens
STUDY QUESTION: Does mouse endometrial epithelial cells and stromal cells have a similar transient receptor potential (TRP)-channel expression profile and to that found in the human endometrium? SUMMARY ANSWER: Mouse endometrial epithelial and stromal cells have a distinct TRP channel expression profile analogous to what has been found in human endometrium, and hence suggests the mouse a good model to investigate the role of TRP channels in reproduction. WHAT IS KNOWN ALREADY: An optimal intercellular communication between epithelial and stromal endometrial cells is crucial for successful reproduction...
January 6, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28028617/calcium-gated-k-channels-of-the-kca1-1-and-kca3-1-type-couple-intracellular-ca-2-signals-to-membrane-hyperpolarization-in-mesenchymal-stromal-cells-from-the-human-adipose-tissue
#4
Michail V Tarasov, Marina F Bystrova, Polina D Kotova, Olga A Rogachevskaja, Veronika Y Sysoeva, Stanislav S Kolesnikov
Electrogenesis in mesenchymal stromal cells (MSCs) remains poorly understood. Little is known about ion channels active in resting MSCs and activated upon MSC stimulation, particularly, by agonists mobilizing Ca(2+) in the MSC cytoplasm. A variety of Ca(2+)-gated ion channels may couple Ca(2+) signals to polarization of the plasma membrane. Here, we studied MSCs from the human adipose tissue and found that in cells responsive to ATP and adenosine with Ca(2+) transients or exhibiting spontaneous Ca(2+) oscillations, Ca(2+) bursts were associated with hyperpolarization mediated by Ca(2+)-gated K(+) channels...
December 27, 2016: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/27995510/mechanisms-of-global-cerebral-edema-formation-in-aneurysmal-subarachnoid-hemorrhage
#5
Erik G Hayman, Aaron Wessell, Volodymyr Gerzanich, Kevin N Sheth, J Marc Simard
A growing body of clinical literature emphasizes the impact of cerebral edema in early brain injury following aneurysmal subarachnoid hemorrhage (aSAH). Aneurysm rupture itself initiates global cerebral edema in up to two thirds of cases. Although cerebral edema is not a universal feature of aSAH, it portends a poor clinical course, with quantitative analysis revealing a direct correlation between cerebral edema and poor outcome, including mortality and cognitive deficits. Mechanistically, global cerebral edema has been linked to global ischemia at the time of aneurysm rupture, dysfunction of autoregulation, blood breakdown products, neuroinflammation, and hyponatremia/endocrine abnormalities...
December 19, 2016: Neurocritical Care
https://www.readbyqxmd.com/read/27956381/hydrogen-peroxide-suppresses-trpm4-trafficking-to-the-apical-membrane-in-mouse-cortical-collecting-duct-principal-cells
#6
Ming-Ming Wu, Yu-Jia Zhai, Yu-Xia Li, Qing-Qing Hu, Zhi-Rui Wang, Shi-Peng Wei, Li Zou, Abdel A Alli, Tiffany L Thai, Zhi-Ren Zhang, He-Ping Ma
A Ca(2+)-activated nonselective cation channel (NSCCa) is found in principal cells of the mouse cortical collecting duct (CCD). However, the molecular identity of this channel remains unclear. We used mpkCCDc14 cells, a mouse CCD principal cell line, to determine whether NSCCa represents the transient receptor potential (TRP) channel, the melastatin subfamily 4 (TRPM4). A Ca(2+)-sensitive single-channel current was observed in inside-out patches excised from the apical membrane of mpkCCDc14 cells. Like TRPM4 channels found in other cell types, this channel has an equal permeability for Na(+) and K(+) and has a linear current-voltage relationship with a slope conductance of ~23 pS...
December 1, 2016: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/27834303/single-nucleotide-polymorphisms-and-genotypes-of-transient-receptor-potential-ion-channel-and-acetylcholine-receptor-genes-from-isolated-b-lymphocytes-in-myalgic-encephalomyelitis-chronic-fatigue-syndrome-patients
#7
Sonya Marshall-Gradisnik, Samantha Johnston, Anu Chacko, Thao Nguyen, Peter Smith, Donald Staines
OBJECTIVE: The pathomechanism of chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME) is unknown; however, a small subgroup of patients has shown muscarinic antibody positivity and reduced symptom presentation following anti-CD20 intervention. Given the important roles of calcium (Ca(2+)) and acetylcholine (ACh) signalling in B cell activation and potential antibody development, we aimed to identify relevant single nucleotide polymorphisms (SNPs) and genotypes in isolated B cells from CFS/ME patients...
November 10, 2016: Journal of International Medical Research
https://www.readbyqxmd.com/read/27807801/role-of-glibenclamide-in-brain-injury-after-intracerebral-hemorrhage
#8
Bing Jiang, Lin Li, Qianwei Chen, Yihao Tao, Liming Yang, Bo Zhang, John H Zhang, Hua Feng, Zhi Chen, Jun Tang, Gang Zhu
Brain edema following intracerebral hemorrhage (ICH) causes severe secondary brain injury, and no efficient pharmacological preventions are available. The present study was designed to demonstrate the neuroprotective effects of glibenclamide on brain edema and key factors of the blood-brain barrier (BBB). The study was divided into two parts. First, we utilized an autoblood-induced rat model to investigate the expression of sulfonylurea receptor 1 (Sur1). Second, rats were randomized into sham, vehicle, and glibenclamide groups...
November 3, 2016: Translational Stroke Research
https://www.readbyqxmd.com/read/27784066/trpv2-channels-contribute-to-stretch-activated-cation-currents-and-myogenic-constriction-in-retinal-arterioles
#9
Mary K McGahon, José A Fernández, Durga P Dash, Jon McKee, David A Simpson, Alex V Zholos, J Graham McGeown, Tim M Curtis
Purpose: Activation of the transient receptor potential channels, TRPC6, TRPM4, and TRPP1 (PKD2), has been shown to contribute to the myogenic constriction of cerebral arteries. In the present study we sought to determine the potential role of various mechanosensitive TRP channels to myogenic signaling in arterioles of the rat retina. Methods: Rat retinal arterioles were isolated for RT-PCR, Fura-2 Ca2+ microfluorimetry, patch-clamp electrophysiology, and pressure myography studies...
October 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27624684/trpm4-mediated-control-of-fc%C3%AE%C2%B5ri-evoked-ca-2-elevation-comprises-enhanced-plasmalemmal-trafficking-of-trpm4-channels-in-connective-tissue-type-mast-cells
#10
Torben Rixecker, Ilka Mathar, Rebekka Medert, Stefanie Mannebach, Alexander Pfeifer, Peter Lipp, Volodymyr Tsvilovskyy, Marc Freichel
TRPM4 proteins form Ca(2+)-activated non selective cation (CAN) channels that affect transmembrane Ca(2+)-influx by determining the membrane potential. Tight control of the intracellular Ca(2+) concentration is essential for mast cell responses. In this study, we analyzed the expression of TRPM4 in peritoneal mast cells (PCMC) as a model for connective tissue type mast cells with respect to FcεRI-evoked calcium changes and the subcellular localization of fluorescently labeled TRPM4 using two viral transduction systems before and following antigen stimulation...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27464700/expression-of-transient-receptor-potential-channels-in-the-purified-human-pancreatic-%C3%AE-cells
#11
Francesco Marabita, Md Shahidul Islam
OBJECTIVE: Members of the transient receptor potential (TRP) channels are involved in mediating the electrical excitability and stimulus-secretion coupling in the pancreatic β-cells. The expression and the relative abundance of different TRP channels in the human β-cells are unknown. The objective of this study was to examine the expression of the TRP channels and their relative abundance in the human β-cell. METHODS: RNA sequencing data obtained from human islets, fluorescence-activated cell sorting-purified human β-cell and human pancreatic acinar cells were analyzed...
January 2017: Pancreas
https://www.readbyqxmd.com/read/27413041/glibenclamide-is-comparable-to-target-temperature-management-in-improving-survival-and-neurological-outcome-after-asphyxial-cardiac-arrest-in-rats
#12
Kaibin Huang, Ziyue Wang, Yong Gu, Yafang Hu, Zhong Ji, Shengnan Wang, Zhenzhou Lin, Xing Li, Zuoshan Xie, Suyue Pan
BACKGROUND: We previously have shown that glibenclamide (GBC), a sulfonylurea receptor 1-transient receptor potential M4 (SUR1-TRPM4) channel inhibitor, improves survival and neurological outcome after asphyxial cardiac arrest and cardiopulmonary resuscitation (ACA/CPR). Here, we further compare the efficacy of GBC with target temperature management (TTM) and determine whether the efficacy of GBC is affected by TTM. METHODS AND RESULTS: Male Sprague-Dawley rats (n=213) subjected to 10-minute ACA/CPR were randomized to 4 groups after return of spontaneous circulation (ROSC): normothermia control (NT); GBC; TTM; and TTM+GBC...
July 13, 2016: Journal of the American Heart Association
https://www.readbyqxmd.com/read/27328745/direct-modulation-of-trpm4-and-trpm3-channels-by-the-phospholipase-c-inhibitor-u73122
#13
Michael G Leitner, Niklas Michel, Marc Behrendt, Marlen Dierich, Sandeep Dembla, Bettina U Wilke, Maik Konrad, Moritz Lindner, Johannes Oberwinkler, Dominik Oliver
BACKGROUND AND PURPOSE: Signalling through phospholipase C (PLC) controls many cellular processes. Much information on the relevance of this important pathway has been derived from pharmacological inhibition of the enzymatic activity of PLC. We found that the most frequently employed PLC inhibitor, U73122, activates endogenous ionic currents in widely used cell lines. Given the extensive use of U73122 in research, we set out to identify these U73122-sensitive ion channels. EXPERIMENTAL APPROACH: We performed detailed biophysical analysis of the U73122-induced currents in frequently used cell lines...
August 2016: British Journal of Pharmacology
https://www.readbyqxmd.com/read/27246103/the-sur1-trpm4-channel-regulates-nos2-transcription-in-tlr4-activated-microglia
#14
David B Kurland, Volodymyr Gerzanich, Jason K Karimy, Seung Kyoon Woo, Rudi Vennekens, Marc Freichel, Bernd Nilius, Joseph Bryan, J Marc Simard
BACKGROUND: Harmful effects of activated microglia are due, in part, to the formation of peroxynitrite radicals, which is attributable to the upregulation of inducible nitric oxide (NO) synthase (NOS2). Because NOS2 expression is determined by Ca(2+)-sensitive calcineurin (CN) dephosphorylating nuclear factor of activated T cells (NFAT), and because Sur1-Trpm4 channels are crucial for regulating Ca(2+) influx, we hypothesized that, in activated microglia, Sur1-Trpm4 channels play a central role in regulating CN/NFAT and downstream target genes such as Nos2...
June 1, 2016: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/27207958/variants-of-transient-receptor-potential-melastatin-member-4-in-childhood-atrioventricular-block
#15
Ninda Syam, Stéphanie Chatel, Lijo Cherian Ozhathil, Valentin Sottas, Jean-Sébastien Rougier, Alban Baruteau, Estelle Baron, Mohamed-Yassine Amarouch, Xavier Daumy, Vincent Probst, Jean-Jacques Schott, Hugues Abriel
BACKGROUND: Transient receptor potential melastatin member 4 (TRPM4) is a nonselective cation channel. TRPM4 mutations have been linked to cardiac conduction disease and Brugada syndrome. The mechanisms underlying TRPM4-dependent conduction slowing are not fully understood. The aim of this study was to characterize TRPM4 genetic variants found in patients with congenital or childhood atrioventricular block. METHODS AND RESULTS: Ninety-one patients with congenital or childhood atrioventricular block were screened for candidate genes...
May 2016: Journal of the American Heart Association
https://www.readbyqxmd.com/read/27147559/local-coupling-of-trpc6-to-ano1-tmem16a-channels-in-smooth-muscle-cells-amplifies-vasoconstriction-in-cerebral-arteries
#16
Qian Wang, M Dennis Leo, Damodaran Narayanan, Korah P Kuruvilla, Jonathan H Jaggar
Anoctamin-1 [ANO1, also known as transmembrane protein 16A (TMEM16A)] is a Ca(2+)-activated Cl(-) channel expressed in arterial myocytes that regulates membrane potential and contractility. Signaling mechanisms that control ANO1 activity in arterial myocytes are poorly understood. In cerebral artery myocytes, ANO1 channels are activated by local Ca(2+) signals generated by plasma membrane nonselective cation channels, but the molecular identity of these proteins is unclear. Arterial myocytes express several different nonselective cation channels, including multiple members of the transient receptor potential receptor (TRP) family...
June 1, 2016: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/27134767/genome-wide-time-to-event-analysis-on-smoking-progression-stages-in-a-family-based-study
#17
Liang He, Janne Pitkäniemi, Kauko Heikkilä, Yi-Ling Chou, Pamela A F Madden, Tellervo Korhonen, Antti-Pekka Sarin, Samuli Ripatti, Jaakko Kaprio, Anu Loukola
BACKGROUND: Various pivotal stages in smoking behavior can be identified, including initiation, conversion from experimenting to established use, development of tolerance, and cessation. Previous studies have shown high heritability for age of smoking initiation and cessation; however, time-to-event genome-wide association studies aiming to identify underpinning genes that accelerate or delay these transitions are missing to date. METHODS: We investigated which single nucleotide polymorphisms (SNPs) across the whole genome contribute to the hazard ratio of transition between different stages of smoking behavior by performing time-to-event analyses within a large Finnish twin family cohort (N = 1962), and further conducted mediation analyses of plausible intermediate traits for significant SNPs...
May 2016: Brain and Behavior
https://www.readbyqxmd.com/read/26888821/new-life-in-overactive-bladder-focus-on-novel-regulatory-mechanism-in-human-urinary-bladder-central-role-of-transient-receptor-potential-melastatin-4-channels-in-detrusor-smooth-muscle-function
#18
EDITORIAL
https://www.readbyqxmd.com/read/26820365/targeted-resequencing-identifies-trpm4-as-a-major-gene-predisposing-to-progressive-familial-heart-block-type-i
#19
Xavier Daumy, Mohamed-Yassine Amarouch, Pierre Lindenbaum, Stéphanie Bonnaud, Eric Charpentier, Beatrice Bianchi, Sabine Nafzger, Estelle Baron, Swanny Fouchard, Aurélie Thollet, Florence Kyndt, Julien Barc, Solena Le Scouarnec, Naomasa Makita, Hervé Le Marec, Christian Dina, Jean-Baptiste Gourraud, Vincent Probst, Hugues Abriel, Richard Redon, Jean-Jacques Schott
BACKGROUND: Progressive cardiac conduction disease (PCCD) is one of the most common cardiac conduction disturbances. It has been causally related to rare mutations in several genes including SCN5A, SCN1B, TRPM4, LMNA and GJA5. METHODS AND RESULTS: In this study, by applying targeted next-generation sequencing (NGS) in 95 unrelated patients with PCCD, we have identified 13 rare variants in the TRPM4 gene, two of which are currently absent from public databases. This gene encodes a cardiac calcium-activated cationic channel which precise role and importance in cardiac conduction and disease is still debated...
March 15, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/26791488/novel-regulatory-mechanism-in-human-urinary-bladder-central-role-of-transient-receptor-potential-melastatin-4-channels-in-detrusor-smooth-muscle-function
#20
Kiril L Hristov, Amy C Smith, Shankar P Parajuli, John Malysz, Eric S Rovner, Georgi V Petkov
Transient receptor potential melastatin 4 (TRPM4) channels are Ca(2+)-activated nonselective cation channels that have been recently identified as regulators of detrusor smooth muscle (DSM) function in rodents. However, their expression and function in human DSM remain unexplored. We provide insights into the functional role of TRPM4 channels in human DSM under physiological conditions. We used a multidisciplinary experimental approach, including RT-PCR, Western blotting, immunohistochemistry and immunocytochemistry, patch-clamp electrophysiology, and functional studies of DSM contractility...
April 1, 2016: American Journal of Physiology. Cell Physiology
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