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Transient receptor potential

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https://www.readbyqxmd.com/read/29471128/spatiotemporal-magnetic-fields-enhance-cytosolic-ca-2-levels-and-induce-actin-polymerization-via-activation-of-voltage-gated-sodium-channels-in-skeletal-muscle-cells
#1
Mónica Rubio Ayala, Tatiana Syrovets, Susanne Hafner, Vitalii Zablotskii, Alexandr Dejneka, Thomas Simmet
Cellular function is modulated by the electric membrane potential controlling intracellular physiology and signal propagation from a motor neuron to a muscle fiber resulting in muscle contraction. Unlike electric fields, magnetic fields are not attenuated by biological materials and penetrate deep into the tissue. We used complex spatiotemporal magnetic fields (17-70 mT) to control intracellular signaling in skeletal muscle cells. By changing different parameters of the alternating magnetic field (amplitude, inversion time, rotation frequency), we induced transient depolarization of cellular membranes leading to i) Na+ influx through voltage-gated sodium channels (VGSC), ii) cytosolic calcium increase, and iii) VGSC- and ryanodine receptor-dependent increase of actin polymerization...
February 16, 2018: Biomaterials
https://www.readbyqxmd.com/read/29470146/towards-an-effective-peripheral-visceral-analgesic-responding-to-the-national-opioid-crisis
#2
Michael Camilleri
This is an editorial summarizing recent new developments in visceral analgesics. This promising field is important as a new approach to address abdominal pain with peripheral visceral analgesics is considered a key approach to addressing the current opioid crisis. Some of the novel compounds address peripheral pain mechanisms through modulation of opioid receptors through biased ligands, nociceptin/orphanin FQ opioid peptide (NOP) receptor or dual action on NOP and μ-opioid receptor, buprenorphine and morphiceptin analogs...
February 22, 2018: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29469570/ribemansides-a-and-b-trpc6-inhibitors-from-ribes-manshuricum-that-suppress-tgf-%C3%AE-1-induced-fibrogenesis-in-hk-2-cells
#3
Baoping Zhou, Yange Wang, Chunlei Zhang, Guolin Yang, Fan Zhang, Boyang Yu, Chengzhi Chai, Zhengyu Cao
Two new acylated β-hydroxynitrile glycosides, ribemansides A (1) and B (2), were isolated from the aerial parts of Ribes manshuricum. Their structures were elucidated by comprehensive spectroscopic analysis. Ribemansides A and B inhibited transforming growth factor β1 (TGF-β1)-induced expression of α-smooth muscle actin, fibronectin release, and changes in cell morphology in the human proximal tubular epithelial cell line (human kidney-2, HK-2). Further biological evaluation demonstrated that both 1 and 2 inhibit the activity of canonical transient receptor potential cation channel 6 (TRPC6), with IC50 values of 24...
February 22, 2018: Journal of Natural Products
https://www.readbyqxmd.com/read/29468191/a-neural-circuit-mechanism-for-the-involvements-of-dopamine-in-effort-related-choices-decay-of-learned-values-secondary-effects-of-depletion-and-calculation-of-temporal-difference-error
#4
Kenji Morita, Ayaka Kato
Dopamine has been suggested to be crucially involved in effort-related choices. Key findings are that dopamine depletion (i) changed preference for a high-cost, large-reward option to a low-cost, small-reward option, (ii) but not when the large-reward option was also low-cost or the small-reward option gave no reward, (iii) while increasing the latency in all the cases but only transiently, and (iv) that antagonism of either dopamine D1 or D2 receptors also specifically impaired selection of the high-cost, large-reward option...
January 2018: ENeuro
https://www.readbyqxmd.com/read/29467763/functional-role-of-transient-receptor-potential-channels-in-immune-cells-and-epithelia
#5
REVIEW
Mohammad Khalil, Korina Alliger, Carl Weidinger, Cansu Yerinde, Stefan Wirtz, Christoph Becker, Matthias Agop Engel
Transient receptor potential (TRP) ion channels are widely expressed in several tissues throughout the mammalian organism. Originally, TRP channel physiology was focusing on its fundamental meaning in sensory neuronal function. Today, it is known that activation of several TRP ion channels in peptidergic neurons does not only result in neuropeptide release and consecutive neurogenic inflammation. Growing evidence demonstrates functional extra-neuronal TRP channel expression in immune and epithelial cells with important implications for mucosal immunology...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29466323/transplantation-of-recombinant-vascular-endothelial-growth-factor-vegf-189-neural-stem-cells-downregulates-transient-receptor-potential-vanilloid-1-trpv1-and-improves-motor-outcome-in-spinal-cord-injury
#6
Yun Zeng, Heng Han, Bing Tang, Jie Chen, Dan Mao, Min Xiong
BACKGROUND Spinal cord injury (SCI) causes a rapid loss of motor neurons, leading to weakness and paralysis. Transplantation of neural stem cells is known to restore the neuronal activity but is inefficient due to limited regenerative capability and low rate of survival. There has been an emphasis on the use of growth factors along with neural stem cells (NSCs) to enhance the neuronal recovery. Transplantation of recombinant NSCs with vascular endothelial growth factor (VEGF) might promote neuronal repair. This effect might be attributed to the reduced transient receptor potential vanilloid 1 (TRPV1) expression following transplantation...
February 21, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29465314/endogenously-generated-arachidonate-derived-ligands-for-trpv1-induce-cardiac-protection-in-sepsis
#7
Jianmin Chen, Alexander J P Hamers, Michaela Finsterbusch, Gianmichele Massimo, Maleeha Zafar, Roger Corder, Romain A Colas, Jesmond Dalli, Christoph Thiemermann, Amrita Ahluwalia
The severity of cardiac dysfunction predicts mortality in sepsis. Activation of transient receptor potential vanilloid receptor type (TRPV)-1, a predominantly neuronal nonselective cation channel, has been shown to improve outcome in sepsis and endotoxemia. However, the role of TRPV1 and the identity of its endogenous ligands in the cardiac dysfunction caused by sepsis and endotoxemia are unknown. Using TRPV1-/- and TRPV1+/+ mice, we showed that endogenous activation of cardiac TRPV1 during sepsis is key to limiting the ensuing cardiac dysfunction...
February 20, 2018: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29464762/kpr-2579-a-novel-trpm8-antagonist-inhibits-acetic-acid-induced-bladder-afferent-hyperactivity-in-rats
#8
Naoki Aizawa, Yoshikazu Fujimori, Jun-Ichi Kobayashi, Osamu Nakanishi, Hideaki Hirasawa, Haruki Kume, Yukio Homma, Yasuhiko Igawa
AIMS: Transient receptor potential melastatin 8 (TRPM8) is proposed to be a promising therapeutic target for hypersensitive bladder disorders. We examined the effects of KPR-2579, a novel selective TRPM8 antagonist, on body temperature and on mechanosensitive bladder single-unit afferent activities (SAAs) provoked by intravesical acetic acid (AA) instillation in rats. METHODS: Female Sprague-Dawley rats were used. Effects of cumulative intravenous (i.v.) administrations of KPR-2579 (0...
February 21, 2018: Neurourology and Urodynamics
https://www.readbyqxmd.com/read/29464560/transient-receptor-potential-trp-channels
#9
Amrita Samanta, Taylor E T Hughes, Vera Y Moiseenkova-Bell
Transient Receptor Potential (TRP) channels are evolutionarily conserved integral membrane proteins. The mammalian TRP superfamily of ion channels consists of 28 cation permeable channels that are grouped into six subfamilies based on sequence homology (Fig. 6.1). The canonical TRP (TRPC) subfamily is known for containing the founding member of mammalian TRP channels. The vanilloid TRP (TRPV) subfamily has been extensively studied due to the heat sensitivity of its founding member. The melastatin-related TRP (TRPM) subfamily includes some of the few known bi-functional ion channels, which contain functional enzymatic domains...
2018: Sub-cellular Biochemistry
https://www.readbyqxmd.com/read/29464320/comparative-immunohistochemical-characterization-of-interstitial-cells-in-the-urinary-bladder-of-human-guinea-pig-and-pig
#10
Clara Steiner, Thomas Gevaert, Roman Ganzer, Dirk De Ridder, Jochen Neuhaus
Interstitial cells (ICs) are thought to play a functional role in urinary bladder. Animal models are commonly used to elucidate bladder physiology and pathophysiology. However, inter-species comparative studies on ICs are rare. We therefore analyzed ICs and their distribution in the upper lamina propria (ULP), the deeper lamina propria (DLP) and the detrusor muscular layer (DET) of human, guinea pig (GP) and pig. Paraffin slices were examined by immunohistochemistry and 3D confocal immunofluorescence of the mesenchymal intermediate filament vimentin (VIM), alpha-smooth muscle actin (αSMA), platelet-derived growth factor receptor alpha (PDGFRα) and transient receptor potential cation channel A1 (TRPA1)...
February 20, 2018: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/29463718/structure-of-full-length-human-trpm4
#11
Jingjing Duan, Zongli Li, Jian Li, Ana Santa-Cruz, Silvia Sanchez-Martinez, Jin Zhang, David E Clapham
Transient receptor potential melastatin subfamily member 4 (TRPM4) is a widely distributed, calcium-activated, monovalent-selective cation channel. Mutations in human TRPM4 (hTRPM4) result in progressive familial heart block. Here, we report the electron cryomicroscopy structure of hTRPM4 in a closed, Na+ -bound, apo state at pH 7.5 to an overall resolution of 3.7 Å. Five partially hydrated sodium ions are proposed to occupy the center of the conduction pore and the entrance to the coiled-coil domain. We identify an upper gate in the selectivity filter and a lower gate at the entrance to the cytoplasmic coiled-coil domain...
February 20, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29463225/glycolysis-is-essential-for-chemoresistance-induced-by-transient-receptor-potential-channel-c5-in-colorectal-cancer
#12
Teng Wang, Kuan Ning, Xu Sun, Chun Zhang, Lin-Fang Jin, Dong Hua
BACKGROUND: Elevated intracellular Ca2+ ([Ca2+ ]i ) level could lead to [Ca2+ ]i overload and promote apoptosis via different pathways. In our previously study, up-regulated expression of transient receptor potential canonical channel (TRPC5) was proven to increase [Ca2+ ]i level, and resulted in chemoresistance whereas not apoptosis in human colorectal cancer (CRC) cells. The ATP-dependent homeostatic maintenance of resting [Ca2+ ]i should be important in this process. Increased glycolysis was found to be an important adenosine triphosphate (ATP) source in cancer...
February 20, 2018: BMC Cancer
https://www.readbyqxmd.com/read/29462784/transient-receptor-potential-vanilloid-4-trpv4-activation-by-arachidonic-acid-requires-protein-kinase-a-mediated-phosphorylation
#13
Sheng Cao, Andriy Anishkin, Natalya S Zinkevich, Yoshinori Nishijima, Ankush Korishettar, Zhihao Wang, Juan Fang, David A Wilcox, David X Zhang
TRPV4 is a Ca2+-permeable channel of the transient receptor potential (TRP) superfamily activated by diverse stimuli including warm temperature, mechanical forces, and lipid mediators such as arachidonic acid (AA) and its metabolites. This activation is tightly regulated by protein phosphorylation carried out by various serine/threonine or tyrosine kinases. It remains poorly understood how phosphorylation differentially regulates TRPV4 activation in response to different stimuli. We investigated how TRPV4 activation by AA, an important signaling process in the dilation of coronary arterioles, is affected by protein kinase A (PKA)-mediated phosphorylation at S824...
February 8, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29459735/structural-heterogeneity-of-the-rat-pulmonary-vein-myocardium-consequences-on-intracellular-calcium-dynamics-and-arrhythmogenic-potential
#14
C Pasqualin, A Yu, C O Malécot, F Gannier, C Cognard, D Godin-Ribuot, J Morand, P Bredeloux, V Maupoil
Mechanisms underlying ectopic activity in the pulmonary vein (PV) which triggers paroxysmal atrial fibrillation are unknown. Although several studies have suggested that calcium signalling might be involved in these arrhythmias, little is known about calcium cycling in PV cardiomyocytes (CM). We found that individual PV CM showed a wide range of transverse tubular incidence and organization, going from their virtual absence, as described in atrial CM, to well transversally organised tubular systems, like in ventricular CM...
February 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29458120/major-role-for-trpv1-and-insp3r-in-par-2-elicited-inflammatory-mediator-production-in-differentiated-human-keratinocytes
#15
Olivier Gouin, Killian L'Herondelle, Paul Buscaglia, Christelle Le Gall-Ianotto, Réginald Philippe, Nelig Legoux, Olivier Mignen, Virginie Buhé, Raphael Leschiera, Mehdi Sakka, Nathalie Kerfant, Jean-Luc Carré, Raphaele Le Garrec, Luc Lefeuvre, Nicolas Lebonvallet, Laurent Misery
Proteinase-activated receptor-2 (PAR-2) activation in basal keratinocytes stimulates inflammation via the Ca2+ -dependent production of mediators such as interleukin (IL)-1β, tumor necrosis factor (TNF)-α and thymic stromal lymphopoietin (TSLP). In this study, we investigated PAR-2 calcium signaling and the consequent production of inflammatory mediators in differentiated human primary keratinocytes (DhPKs). Stimulation with the PAR-2 activating peptide SLIGKV promoted Ca2+ store depletion in both undifferentiated human primary keratinocytes (UhPKs) and DhPKs...
February 16, 2018: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/29456142/the-feronia-receptor-kinase-maintains-cell-wall-integrity-during-salt-stress-through-ca-2-signaling
#16
Wei Feng, Daniel Kita, Alexis Peaucelle, Heather N Cartwright, Vinh Doan, Qiaohong Duan, Ming-Che Liu, Jacob Maman, Leonie Steinhorst, Ina Schmitz-Thom, Robert Yvon, Jörg Kudla, Hen-Ming Wu, Alice Y Cheung, José R Dinneny
Cells maintain integrity despite changes in their mechanical properties elicited during growth and environmental stress. How cells sense their physical state and compensate for cell-wall damage is poorly understood, particularly in plants. Here we report that FERONIA (FER), a plasma-membrane-localized receptor kinase from Arabidopsis, is necessary for the recovery of root growth after exposure to high salinity, a widespread soil stress. The extracellular domain of FER displays tandem regions of homology with malectin, an animal protein known to bind di-glucose in vitro and important for protein quality control in the endoplasmic reticulum...
February 12, 2018: Current Biology: CB
https://www.readbyqxmd.com/read/29452097/stimulation-of-trpv1-channels-activates-the-ap-1-transcription-factor
#17
Tobias M Backes, Oliver G Rössler, Xin Hui, Carsten Grötzinger, Peter Lipp, Gerald Thiel
Transient receptor potential vanilloid 1 (TRPV1) channels were originally described as the receptors of capsaicin, the main constituent of hot chili pepper. The biological functions of TRPV1 channels include pain sensation and inflammatory thermal hyperalgesia. Here, we show that stimulation of HEK293 cells expressing TRPV1 channels (H2C1 cells) with capsaicin or the TRPV1 ligand resiniferatoxin activated transcription mediated by the transcription factor AP-1. No cell death was occurring under these experimental conditions...
February 13, 2018: Biochemical Pharmacology
https://www.readbyqxmd.com/read/29452094/evolving-mechanisms-of-vascular-smooth-muscle-contraction-highlight-key-targets-in-vascular-disease
#18
REVIEW
Zhongwei Liu, Raouf A Khalil
Vascular smooth muscle (VSM) plays an important role in the regulation of vascular function. Identifying the mechanisms of VSM contraction has been a major research goal in order to determine the causes of vascular dysfunction and exaggerated vasoconstriction in vascular disease. Major discoveries over several decades have helped to better understand the mechanisms of VSM contraction. Ca 2+ has been established as a major regulator of VSM contraction, and its sources, cytosolic levels, homeostatic mechanisms and subcellular distribution have been defined...
February 13, 2018: Biochemical Pharmacology
https://www.readbyqxmd.com/read/29446246/improvement-of-cardiomyocyte-function-by-in-vivo-hexarelin-treatment-in-streptozotocin-induced-diabetic-rats
#19
Xinli Zhang, Linbing Qu, Ling Chen, Chen Chen
Diabetic cardiomyopathy is characterized by diastolic and systolic cardiac dysfunction, yet no therapeutic drug to specifically treat it. Hexarelin has been demonstrated to improve heart function in various types of cardiomyopathy via its receptor GHS-R. This experiment aims to test the effect of hexarelin on cardiomyocytes under experimental diabetes. Streptozotocin (STZ, 65 mg/kg)-induced diabetic rat model was employed with vehicle injection group as control. Daily hexarelin (100 μg/kg) treatment was performed for 2 weeks after 4-week STZ-induced diabetes...
February 2018: Physiological Reports
https://www.readbyqxmd.com/read/29445096/chronic-intermittent-hypoxia-promotes-myocardial-ischemia-related-ventricular-arrhythmias-and-sudden-cardiac-death
#20
Jessica Morand, Claire Arnaud, Jean-Louis Pepin, Diane Godin-Ribuot
We investigated the effects of intermittent hypoxia (IH), such as that encountered in severe obstructive sleep apnea (OSA) patients, on the development and severity of myocardial ischemia-related ventricular arrhythmias. Rats were exposed to 14 days of IH (30 s at 5%O 2 and 30 s at 21%O 2 , 8 h·day -1 ) or normoxia (N, similar air-air cycles) and submitted to a 30-min coronary ligature. Arterial blood pressure (BP) and ECG were recorded for power spectral analysis, ECG interval measurement and arrhythmia quantification...
February 14, 2018: Scientific Reports
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