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Transient receptor potential

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https://www.readbyqxmd.com/read/27932558/petct-imaging-of-unstable-carotid-plaque-with-ga-68-labelled-somatostatin-receptor-ligand
#1
Ming Young Simon Wan, Raymond Endozo, Sofia Michopoulou, Robert Shortman, Manuel Rodriguez-Justo, Leon Menezes, Syed Yusuf, Toby Richards, Damian Wild, Beatrice Waser, Jean Claude Reubi, Ashley Groves
BACKGROUND: Ga68 labelled somatostatin receptor ligand PET imaging has recently been shown in preclinical and early human studies to have a potential role in the evaluation of vulnerable arterial plaques. We prospectively evaluated carotid plaque Ga68-DOTATATE uptake in patients with recent carotid events, assessed inter- and intra- observer variability of such measurements, and explored the mechanism of any plaque DOTATATE activity with immunohistochemistry in resected specimens. MATERIALS & METHODS: 20 consecutively consenting patients with recent symptomatic carotid events (transient ischaemic attack [TIA], stroke or amaurosis fugax), due for carotid endarterectomy were prospectively recruited...
December 8, 2016: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/27932059/classical-transient-receptor-potential-trpc6-channels-support-myofibroblast-differentiation-and-development-of-experimental-pulmonary-fibrosis
#2
Katharina Hofmann, Susanne Fiedler, Sarah Vierkotten, Jonas Weber, Stephan Klee, Jie Jia, Wolfgang Zwickenpflug, Veit Flockerzi, Ursula Storch, Ali Önder Yildirim, Thomas Gudermann, Melanie Königshoff, Alexander Dietrich
Pulmonary fibrosis (PF) is a chronic progressive lung disease without effective medical treatment options leading to respiratory failure and death within 3-5 years of diagnosis. The pathological process of PF is driven by aberrant wound-healing involving fibroblasts and myofibroblasts differentiated by secreted profibrotic transforming growth factor β (TGF-β1). Classical transient receptor potential 6 (TRPC6), a Na(+)- and Ca(2+)-permeable cation channel, is able to promote myofibroblast conversion of primary rat cardiac and human dermal fibroblasts and TRPC6-deficiency impaired wound healing after injury...
December 5, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27930673/dopamine-neurons-change-the-type-of-excitability-in-response-to-stimuli
#3
Ekaterina O Morozova, Denis Zakharov, Boris S Gutkin, Christopher C Lapish, Alexey Kuznetsov
The dynamics of neuronal excitability determine the neuron's response to stimuli, its synchronization and resonance properties and, ultimately, the computations it performs in the brain. We investigated the dynamical mechanisms underlying the excitability type of dopamine (DA) neurons, using a conductance-based biophysical model, and its regulation by intrinsic and synaptic currents. Calibrating the model to reproduce low frequency tonic firing results in N-methyl-D-aspartate (NMDA) excitation balanced by γ-Aminobutyric acid (GABA)-mediated inhibition and leads to type I excitable behavior characterized by a continuous decrease in firing frequency in response to hyperpolarizing currents...
December 2016: PLoS Computational Biology
https://www.readbyqxmd.com/read/27929123/rnai-mediated-mortality-of-the-whitefly-through-transgenic-expression-of-double-stranded-rna-homologous-to-acetylcholinesterase-and-ecdysone-receptor-in-tobacco-plants
#4
Hassan Jamil Malik, Amir Raza, Imran Amin, Jodi A Scheffler, Brian E Scheffler, Judith K Brown, Shahid Mansoor
The whitefly Bemisia tabaci (Genn.) is a pest and vector of plant viruses to crop and ornamental plants worldwide. Using RNA interference (RNAi) to down regulate whitefly genes by expressing their homologous double stranded RNAs in plants has great potential for management of whiteflies to reduce plant virus disease spread. Using a Tobacco rattle virus-derived plasmid for in planta transient expression of double stranded RNA (dsRNA) homologous to the acetylcholinesterase (AChE) and ecdysone receptor (EcR) genes of B...
December 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27926982/trpv4-channels-mediate-na-k-cl-co-transporter-induced-brain-edema-after-traumatic-brain-injury
#5
Kwok-Tung Lu, Tai-Chun Huang, Ya-Hsin Tsai, Yi-Ling Yang
Na(+) -K(+) -2Cl(-) co-transporter (NKCC1) plays an important role in traumatic brain injury (TBI)-induced brain edema via the mitogen-activated protein kinases (MAPK) cascade. The transient receptor potential vanilloid type 4 (TRPV4) channel participates in neurogenic inflammation, pain transmission and edema. In this study, we investigated the relationship between NKCC1 and TRPV4 and the related signaling pathways in TBI-induced brain edema and neuronal damage. TBI was induced by the calibrated weight-drop device...
December 7, 2016: Journal of Neurochemistry
https://www.readbyqxmd.com/read/27926584/common-single-nucleotide-polymorphisms-in-transient-receptor-potential-melastatin-type-6-increase-the-risk-for-proton-pump-inhibitor-induced-hypomagnesemia-a-case-control-study
#6
Mark W Hess, Jeroen H F de Baaij, Mark M T J Broekman, Tanya M Bisseling, Bertram J T Haarhuis, Adriaan C I T L Tan, René H M Te Morsche, Joost G J Hoenderop, René J M Bindels, Joost P H Drenth
OBJECTIVE: Proton pump inhibitors (PPIs) are effective drugs for the treatment of gastric acid-related disorders. Serious adverse events are rare for PPIs, but recent data suggest that PPIs cause hypomagnesemia. The aim of this study was to estimate the frequency of PPI-induced hypomagnesemia and to define the risk factors for its development. MATERIALS AND METHODS: A total of 133 chronic users of PPIs were enrolled and patients were distinguished on the basis of their serum Mg concentrations...
December 6, 2016: Pharmacogenetics and Genomics
https://www.readbyqxmd.com/read/27925186/up-regulation-of-transient-receptor-potential-melastatin-6-channel-expression-by-tumor-necrosis-factor-%C3%AE-in-the-presence-of-epidermal-growth-factor-receptor-tyrosine-kinase-inhibitor
#7
Chisa Furukawa, Naoko Fujii, Aya Manabe, Toshiyuki Matsunaga, Satoshi Endo, Hajime Hasegawa, Yoshinori Ito, Masahiko Yamaguchi, Yasuhiro Yamazaki, Akira Ikari
Anti-epidermal growth factor receptor (EGFR) drugs such as erlotinib and gefitinib cause a side effect of hypomagnesemia, but chemotherapy to treat this has not yet been developed. The transient receptor potential melastatin 6 (TRPM6) channel is involved in the reabsorption of Mg(2+) in the renal tubule. We reported previously that the expression of TRPM6 is up-regulated by epidermal growth factor (EGF) in renal tubular epithelial NRK-52E and HEK293 cells. EGF-induced elevation of TRPM6 expression was inhibited by erlotinib, gefitinib, and lapatinib...
December 7, 2016: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/27923234/transient-receptor-potential-vanilloid-1-channels-contribute-to-the-regulation-of-acid-and-base-induced-vasomotor-responses
#8
Ivan Ivic, Margit Solymar, Eszter Pakai, Zoltan Rumbus, Erika Pinter, Akos Koller, Andras Garami
pH changes can influence local blood flow, but the mechanisms of how acids and bases affect vascular tone is not fully clarified. Transient receptor potential vanilloid-1 (TRPV1) channels are expressed in vessels and can be activated by pH alterations. Thus, we hypothesized that TRPV1 channels are involved in the mediation of vascular responses to acid-base changes. Vasomotor responses to HCl, NaOH, and capsaicin were measured in isolated murine carotid and tail skin arteries. The function of TRPV1 was blocked by either of three approaches: Trpv1 gene disruption, pharmacological blockade with a TRPV1 antagonist (BCTC), and functional impairment of mainly neural TRPV1 channels (desensitization)...
December 7, 2016: Journal of Vascular Research
https://www.readbyqxmd.com/read/27920205/molecular-determinants-of-the-sensitivity-to-gq-11-phospholipase-c-dependent-gating-gd3-potentiation-and-ca2-permeability-in-the-transient-receptor-potential-canonical-type-5-trpc5-channel
#9
Xingjuan Chen, Wennan Li, Ashley M Riley, Mario Soliman, Saikat Chakraborty, Christopher W Stamatkin, Alexander G Obukhov
Transient Receptor Potential Canonical type 5 (TRPC5) is a Ca(2+) permeable cation channel that is highly expressed in the brain and is implicated in motor coordination, innate fear behavior, and seizure-genesis. The channel is activated by a signal downstream of the G-protein-coupled receptor (GPCR)-Gq/11-phospholipase C (PLC) pathway. In this study, we aimed to identify the molecular mechanisms involved in regulating TRPC5 activity. We report that R593, a residue located in the E4 loop near the TRPC5's extracellular Gd(3+)-binding site, is critical for conferring the sensitivity to GPCR-Gq/11-PLC-dependent gating on TRPC5...
December 5, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27920147/accumbens-nnos-interneurons-regulate-cocaine-relapse
#10
Alexander C W Smith, Michael D Scofield, Jasper A Heinsbroek, Cassandra D Gipson, Daniela Neuhofer, Doug J Roberts-Wolfe, Sade Spencer, Neringa M Stankeviciute, Rachel Smith, Nicholas P Allen, Melissa R Lorang, William C Griffin, Heather A Boger, Peter W Kalivas
: Relapse to drug use can be initiated by drug-associated cues. The intensity of cue-induced relapse is correlated with the induction of transient synaptic potentiation (t-SP) at glutamatergic synapses on medium spiny neurons (MSNs) in the nucleus accumbens core (NAcore), and requires spillover of glutamate from prefrontal cortical afferents. We used a rodent self-administration/reinstatement model of relapse to show that cue-induced t-SP and reinstated cocaine-seeking result from glutamate spillover initiating a metabotropic glutamate receptor 5 (mGluR5)-dependent increase in nitric oxide (NO) production...
December 5, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27916453/shank3-deficiency-impairs-heat-hyperalgesia-and-trpv1-signaling-in-primary-sensory-neurons
#11
Qingjian Han, Yong Ho Kim, Xiaoming Wang, Di Liu, Zhi-Jun Zhang, Alexandra L Bey, Mark Lay, Wonseok Chang, Temugin Berta, Yan Zhang, Yong-Hui Jiang, Ru-Rong Ji
Abnormal pain sensitivity is commonly associated with autism spectrum disorders (ASDs) and affects the life quality of ASD individuals. SHANK3 deficiency was implicated in ASD and pain dysregulation. Here, we report functional expression of SHANK3 in mouse dorsal root ganglion (DRG) sensory neurons and spinal cord presynaptic terminals. Homozygous and heterozygous Shank3 complete knockout (Δe4-22) results in impaired heat hyperalgesia in inflammatory and neuropathic pain. Specific deletion of Shank3 in Nav1...
November 24, 2016: Neuron
https://www.readbyqxmd.com/read/27915149/trans-and-paracellular-calcium-transport-along-the-small-and-large-intestine-in-horses
#12
M R Wilkens, L Marholt, N Eigendorf, A S Muscher-Banse, K Feige, B Schröder, G Breves, A Cehak
Intestinal calcium absorption plays a key role in the maintenance of calcium homeostasis and may either occur by paracellular or transcellular mechanisms. The horse has some unique peculiarities in calcium homeostasis compared to other species including a high absorptive capacity for calcium in the intestine, high plasma calcium concentrations, high renal excretion, and low plasma concentrations of vitamin D metabolites. So far, knowledge about the underlying mechanisms and the regulation of intestinal calcium absorption is still limited concerning this species...
November 30, 2016: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/27915078/analgesic-effect-of-coumarins-from-radix-angelicae-pubescentis-is-mediated-by-inflammatory-factors-and-trpv1-in-a-spared-nerve-injury-model-of-neuropathic-pain
#13
Ruili Li, Chao Zhao, Minna Yao, Ying Song, Yin Wu, Aidong Wen
ETHNOPHARMACOLOGICAL RELEVANCE: Coumarins from Radix angelicae pubescentis (CRAP) are a major active component that are isolated from dried roots of Angelica biserrata Yuan et Shan, which has been used clinically to cure headaches for a long period of time, and it is an effective treatment for pain. The aim of the present study was to investigate the analgesic effect of CRAP on a spared nerve injury (SNI) model of neuropathy. MATERIALS AND METHODS: Antinociceptive effects of CRAP were assessed in Sprague-Dawley male rats using a spared nerve injury model of neuropathic pain...
November 30, 2016: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/27913425/cd36-mediates-h2o2-induced-calcium-influx-in-lung-microvascular-endothelial-cells
#14
Karthik Suresh, Laura Servinsky, Jose Reyes, Clark Undem, Joel Zaldumbide, Otgonchimeg Rentsendorj, Sruti Modekurty, Jeffrey M Dodd-O, Alan L Scott, David B Pearse, Larissa A Shimoda
Elevated levels of reactive oxygen species (ROS) and intracellular Ca2+ play a key role in endothelial barrier dysfunction in acute lung injury (ALI). We previously showed that H2O2-induced increases in intracellular calcium concentrations ([Ca2+]i) in LMVECs involve the membrane Ca2+ channel, transient receptor potential vanilloid-4 (TRPV4), and that inhibiting this channel attenuated H2O2-induced barrier disruption in vitro. We also showed that phosphorylation of TRPV4 by the Src family kinase, Fyn, contributes to H2O2-induced Ca2+ influx in LMVEC...
December 2, 2016: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/27913210/trpv4-activation-of-endothelial-nitric-oxide-synthase-resists-nonalcoholic-fatty-liver-disease-by-blocking-cyp2e1-mediated-redox-toxicity
#15
Ratanesh K Seth, Suvarthi Das, Diptadip Dattaroy, Varun Chandrashekaran, Firas Alhasson, Gregory Michelotti, Mitzi Nagarkatti, Prakash Nagarkatti, Anna Mae Diehl, Darwin P Bell, Wolfgang Liedtke, Saurabh Chatterjee
NAFLD is a clinically progressive disease with steatosis, inflammation, endothelial dysfunction and fibrosis being the stages where clinical intervention becomes necessary. Lack of early biomarkers and absence of a FDA approved drug obstructs efforts for effective treatment. NAFLD progression is strongly linked to a balance between liver injury, tissue regeneration and the functioning of endogenous defense mechanisms. The failure of the defense pathways to resist the tissue damage arising from redox stress, one of the "multiple hits" in disease progression, give rise to heightened inflammation and occasional fibrosis...
November 29, 2016: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/27908562/ontogeny-of-sensorimotor-gating-and-short-term-memory-processing-throughout-the-adolescent-period-in-rats
#16
Anja A Goepfrich, Chris M Friemel, Sabina Pauen, Miriam Schneider
Adolescence and puberty are highly susceptible developmental periods during which the neuronal organization and maturation of the brain is completed. The endocannabinoid (eCB) system, which is well known to modulate cognitive processing, undergoes profound and transient developmental changes during adolescence. With the present study we were aiming to examine the ontogeny of cognitive skills throughout adolescence in male rats and clarify the potential modulatory role of CB1 receptor signalling. Cognitive skills were assessed repeatedly every 10th day in rats throughout adolescence...
November 19, 2016: Developmental Cognitive Neuroscience
https://www.readbyqxmd.com/read/27906951/changes-in-neuroglial-activity-in-multiple-spinal-segments-after-caudal-epidural-pulsed-radiofrequency-in-a-rat-model-of-lumbar-disc-herniation
#17
Hee Kyung Cho, Jae Hoon Kang, So-Yeon Kim, Mi-Jung Choi, Se Jin Hwang, Yun-Woo Cho, Sang-Ho Ahn
BACKGROUND: Herniated lumbar discs can induce sciatica by mechanical compression and/or chemical irritation. It was recently reported that neuroglial cellular activity after pulsed radiofrequency (PRF) application to a single dorsal root ganglion (DRG) attenuated neuroglial activity at the corresponding spinal dorsal horn. Recently, caudal epidural PRF has been used to manage neuropathic pain, but evidence of molecular changes after the administration of caudal epidural PRF to attenuate neuropathic pain is lacking, and it has not been determined whether caudal epidural PRF affects neuroglial activity at different spinal levels...
November 2016: Pain Physician
https://www.readbyqxmd.com/read/27906239/fiber-optic-electron-spin-resonance-thermometry-of-single-laser-activated-neurons
#18
A A Lanin, I V Fedotov, Yu G Ermakova, D A Sidorov-Biryukov, A B Fedotov, P Hemmer, V V Belousov, A M Zheltikov
Optically detected electron spin resonance in fiber-coupled nitrogen-vacancy (NV) centers of diamond is used to demonstrate a fiber-optic quantum thermometry of individual thermogenetically activated neurons. Laser-induced temperature variations read out from single neurons with the NV-diamond fiber sensor are shown to strongly correlate with the fluorescence of calcium-ion sensors, serving as online indicators of the inward Ca<sup>2+</sup> current across the cell membrane of neurons expressing transient receptor potential (TRP) cation channels...
December 1, 2016: Optics Letters
https://www.readbyqxmd.com/read/27904950/age-dependent-alpha-synuclein-accumulation-is-correlated-with-elevation-of-mitochondrial-trpc3-in-the-brains-of-monkeys-and-mice
#19
Min Chen, Jia Liu, Yongquan Lu, Chunli Duan, Lingling Lu, Ge Gao, Piu Chan, Shun Yu, Hui Yang
Aberrant α-synuclein (α-syn) accumulation has been shown to impair mitochondrial function by reducing mitochondrial membrane potential (MMP). However, the underlying mechanisms remain elusive. Transient receptor potential canonical (TRPC) channels are a diverse group of non-selective Ca(2+) channels, among which TRPC3 is the only one that is localized in mitochondria and plays a role in maintaining the normal MMP. This raises a possibility that altered TRPC3 expression may play a role in the mitochondrial dysfunction induced by α-syn accumulation...
November 30, 2016: Journal of Neural Transmission
https://www.readbyqxmd.com/read/27902333/plant-produced-anti-dengue-virus-monoclonal-antibodies-exhibit-reduced-antibody-dependent-enhancement-of-infection-activity
#20
Matthew Dent, Jonathan Hurtado, Amber M Paul, Haiyan Sun, Huafang Lai, Ming Yang, Adrian Esqueda, Fengwei Bai, Herta Steinkellner, Qiang Chen
The monoclonal antibody (mAb) E60 has the potential to be a desirable therapeutic molecule since it efficiently neutralizes all four serotypes of dengue virus (DENV). However, mammalian cell-produced E60 exhibits antibody-dependent enhancement of infection (ADE) activity, rendering it inefficacious in vivo and subjects treated animals more susceptible to develop more severe diseases during secondary infection. In this study, we evaluated a plant-based expression system for the production of therapeutically suitable E60...
October 20, 2016: Journal of General Virology
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