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Purinergic signalling

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https://www.readbyqxmd.com/read/29791754/atp-triggers-a-robust-intracellular-ca-2-mediated-signalling-pathway-in-human-synovial-fibroblasts
#1
Kondo C, R B Clark, T Y Kim, Belke D, Banderali U, R T Szerencsei, A H Jalloul, P P M Schnetkamp, Spitzer Kw, Giles Wr
NEW FINDINGS: What is the central question of this study? In human articular joints, the synovial fibroblast HSF cell population has essential functions including secretion of lubricants. We address some remaining questions concerning activation-secretion coupling by characterizing the main [Ca2+ ]i signalling pathways activated by ATP. What is the main finding and its importance? In HSF ATP acts through a linked G-protein (Gq ) and phospholipase C signalling mechanisms to produce IP-3 which markedly enhances release of Ca2+ from the endoplasmic reticulum...
May 23, 2018: Experimental Physiology
https://www.readbyqxmd.com/read/29790164/purinergic-receptor-stimulation-induces-calcium-oscillations-and-smooth-muscle-contraction-in-small-pulmonary-veins
#2
Mauricio Henriquez, Marcelo Fonseca, Jose F Perez-Zoghbi
KEY POINTS: We investigated the excitation-contraction coupling mechanisms in small pulmonary veins (SPVs) in rat precision-cut lung slices. We found that SPVs contract strongly and reversibly in response to extracellular ATP and other vasoconstrictors, including angiotensin-II and endothelin-1. ATP-induced vasoconstriction in SPVs was associated with the stimulation of purinergic P2Y2 receptors in vascular smooth muscle cell, activation of phospholipase C-β and the generation of intracellular Ca2+ oscillations mediated by cyclic Ca2+ release events via the inositol 1,4,5-trisphosphate receptor...
May 23, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29789376/optogenetic-activation-of-colon-epithelium-of-the-mouse-produces-high-frequency-bursting-in-extrinsic-colon-afferents-and-engages-visceromotor-responses
#3
Payal A Makadia, Sarah A Najjar, Jami L Saloman, Peter Adelman, Bin Feng, Joseph F Margiotta, Kathryn M Albers, Brian M Davis
Epithelial cells of the colon provide a vital interface between the internal environment (lumen of the colon) and colon parenchyma. To examine epithelial-neuronal signaling at this interface, we analyzed mice in which channelrhodopsin (ChR2) was targeted to either TRPV1-positive afferents or to villin expressing colon epithelial cells. Expression of a ChR2-EYFP fusion protein was directed to either primary sensory neurons or to colon epithelial cells by crossing Ai32 mice with TRPV1-Cre or villin-Cre mice, respectively...
May 22, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29774059/inflammation-in-stroke-the-role-of-cholinergic-purinergic-and-glutamatergic-signaling
#4
REVIEW
Abraham Martín, María Domercq, Carlos Matute
The inflammatory response is a major factor in stroke pathophysiology and contributes to secondary neuronal damage in both acute and chronic stages of the ischemic injury. Recent work in experimental cerebral ischemia has demonstrated the involvement of neurotransmitter signaling in the modulation of neuroinflammation. The present review discusses recent findings on the therapeutic potential and diagnostic perspectives of cholinergic, purinergic and glutamatergic receptors and transporters in experimental stroke...
2018: Therapeutic Advances in Neurological Disorders
https://www.readbyqxmd.com/read/29752814/valproic-acid-inhibits-atp-triggered-ca-2-release-via-a-p38-dependent-mechanism-in-bend-3-endothelial-cells
#5
Iat-Lon Leong, Tien-Yao Tsai, Kar-Lok Wong, Lian-Ru Shiao, Ka-Shun Cheng, Paul Chan, Yuk-Man Leung
Valproic acid (VA) is currently used to treat epilepsy and bipolar disorder. It has also been demonstrated to promote neuroprotection and neurogenesis. Although beneficial actions of VA on brain blood vessels have also been demonstrated, the effects of VA on brain endothelial cell (EC) Ca2+ signaling is hitherto unreported. In this report we examined the effects of VA on agonist-triggered Ca2+ signaling in mouse cortical bEND.3 EC. While VA (100 μM) did not cause an acute inhibition of ATP-triggered Ca2+ signaling, a 30-min VA treatment strongly suppressed ATP-triggered intracellular Ca2+ release; however, such treatment did not affect Ca2+ release triggered by cyclopiazonic acid, an inhibitor of SERCA Ca2+ pump, suggesting there was no reduction in Ca2+ store size...
May 12, 2018: Fundamental & Clinical Pharmacology
https://www.readbyqxmd.com/read/29745882/the-adenosinergic-system-a-potential-player-in-the-pathogenesis-of-anca-associated-vasculitis
#6
REVIEW
Lovis Kling, Bernhard K Krämer, Benito A Yard, Anna-Isabelle Kälsch
Antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV) is a potentially lethal autoimmune disease whose pathology comprises disturbed T cell differentiation and functionality accompanied by dysfunctional autoreactive immunoglobulin development, culminating in destructive innate immune response as well. Purines, adenine nucleotides and adenosine in particular, have been elucidated as potent extracellular mediators for fine adjustment of these pivotal processes establishing human immunity. Therefore, the extracellular purinergic microenvironment is under control of ectonucleotidases CD39 and CD73 degrading pro-inflammatory adenosine triphosphate (ATP) to anti-inflammatory adenosine as well as adenosine deaminase bound to CD26 deactivating adenosine...
May 3, 2018: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/29742297/advances-in-cellular-and-integrative-control-of-oxygen-homeostasis-within-the-central-nervous-system
#7
Jan-Marino Ramirez, Liza Severs, Sanja C Ramirez, Ibis M Agosto-Marlin
Mammals must continuously regulate the levels of O2 and CO2 , which is particularly important for the brain. Failure to maintain adequate O2 /CO2 homeostasis has been associated with numerous disorders including sleep apnea, Rett syndrome, and sudden infant death syndrome (SIDS). But, O2 /CO2 homeostasis poses major regulatory challenges, even in the healthy brain. Neuronal activities change in a differentiated, spatially and temporally complex manner, which is reflected in equally complex changes in O2 demand...
May 9, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29739879/chemical-synapses-without-synaptic-vesicles-purinergic-neurotransmission-through-a-calhm1-channel-mitochondrial-signaling-complex
#8
Roman A Romanov, Robert S Lasher, Brigit High, Logan E Savidge, Adam Lawson, Olga A Rogachevskaja, Haitian Zhao, Vadim V Rogachevsky, Marina F Bystrova, Gleb D Churbanov, Igor Adameyko, Tibor Harkany, Ruibiao Yang, Grahame J Kidd, Philippe Marambaud, John C Kinnamon, Stanislav S Kolesnikov, Thomas E Finger
Conventional chemical synapses in the nervous system involve a presynaptic accumulation of neurotransmitter-containing vesicles, which fuse with the plasma membrane to release neurotransmitters that activate postsynaptic receptors. In taste buds, type II receptor cells do not have conventional synaptic features but nonetheless show regulated release of their afferent neurotransmitter, ATP, through a large-pore, voltage-gated channel, CALHM1. Immunohistochemistry revealed that CALHM1 was localized to points of contact between the receptor cells and sensory nerve fibers...
May 8, 2018: Science Signaling
https://www.readbyqxmd.com/read/29725032/novel-evidence-that-extracellular-nucleotides-and-purinergic-signaling-induce-innate-immunity-mediated-mobilization-of-hematopoietic-stem-progenitor-cells
#9
Mateusz Adamiak, Kamila Bujko, Monika Cymer, Monika Plonka, Talita Glaser, Magda Kucia, Janina Ratajczak, Henning Ulrich, Ahmed Abdel-Latif, Mariusz Z Ratajczak
Pharmacological mobilization of hematopoietic stem progenitor cells (HSPCs) from bone marrow (BM) into peripheral blood (PB) is a result of mobilizing agent-induced "sterile inflammation" in the BM microenvironment due to complement cascade (ComC) activation. Here we provide evidence that ATP, as an extracellular nucleotide secreted in a pannexin-1-dependent manner from BM cells, triggers activation of the ComC and initiates the mobilization process. This process is augmented in a P2X7 receptor-dependent manner, and P2X7-KO mice are poor mobilizers...
March 30, 2018: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/29717535/structural-basis-for-nucleotide-recognition-by-the-ectoenzyme-cd203c
#10
Alexei Gorelik, Antsa Randriamihaja, Katalin Illes, Bhushan Nagar
The ecto-nucleotide pyrophosphatase/phosphodiesterase (NPP) enzyme family modulates purinergic signaling by degrading extracellular nucleotides. CD203c (NPP3, ENPP3) regulates the inflammatory response of basophils via ATP hydrolysis and is a marker for allergen sensitivity on the surface of these cells. Multiple other roles and substrates have also been proposed for this protein. In order to gain insight into its molecular functions, we determined the crystal structure of human NPP3 as well as its complex with an ATP analog...
May 2, 2018: FEBS Journal
https://www.readbyqxmd.com/read/29713276/amyotrophic-lateral-sclerosis-als-and-adenosine-receptors
#11
REVIEW
Ana M Sebastião, Nádia Rei, Joaquim A Ribeiro
In the present review we discuss the potential involvement of adenosinergic signaling, in particular the role of adenosine receptors, in amyotrophic lateral sclerosis (ALS). Though the literature on this topic is not abundant, the information so far available on adenosine receptors in animal models of ALS highlights the interest to continue to explore the role of these receptors in this neurodegenerative disease. Indeed, all motor neurons affected in ALS are responsive to adenosine receptor ligands but interestingly, there are alterations in pre-symptomatic or early symptomatic stages that mirror those in advanced disease stages...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29692728/purinergic-receptors-in-neurological-diseases-with-motor-symptoms-targets-for-therapy
#12
REVIEW
Ágatha Oliveira-Giacomelli, Yahaira Naaldijk, Laura Sardá-Arroyo, Maria C B Gonçalves, Juliana Corrêa-Velloso, Micheli M Pillat, Héllio D N de Souza, Henning Ulrich
Since proving adenosine triphosphate (ATP) functions as a neurotransmitter in neuron/glia interactions, the purinergic system has been more intensely studied within the scope of the central nervous system. In neurological disorders with associated motor symptoms, including Parkinson's disease (PD), motor neuron diseases (MND), multiple sclerosis (MS), amyotrophic lateral sclerosis (ALS), Huntington's Disease (HD), restless leg syndrome (RLS), and ataxias, alterations in purinergic receptor expression and activity have been noted, indicating a potential role for this system in disease etiology and progression...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29691821/mimetic-hierarchical-approaches-for-osteochondral-tissue-engineering
#13
Ivana Gadjanski
In order to engineer biomimetic osteochondral (OC) construct, it is necessary to address both the cartilage and bone phase of the construct, as well as the interface between them, in effect mimicking the developmental processes when generating hierarchical scaffolds that show gradual changes of physical and mechanical properties, ideally complemented with the biochemical gradients. There are several components whose characteristics need to be taken into account in such biomimetic approach, including cells, scaffolds, bioreactors as well as various developmental processes such as mesenchymal condensation and vascularization, that need to be stimulated through the use of growth factors, mechanical stimulation, purinergic signaling, low oxygen conditioning, and immunomodulation...
2018: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29686622/inhibitory-neural-regulation-of-the-ca-2-transients-in-intramuscular-interstitial-cells-of-cajal-in-the-small-intestine
#14
Salah A Baker, Bernard T Drumm, Caroline A Cobine, Kathleen D Keef, Kenton M Sanders
Gastrointestinal motility is coordinated by enteric neurons. Both inhibitory and excitatory motor neurons innervate the syncytium consisting of smooth muscle cells (SMCs) interstitial cells of Cajal (ICC) and PDGFRα+ cells (SIP syncytium). Confocal imaging of mouse small intestines from animals expressing GCaMP3 in ICC were used to investigate inhibitory neural regulation of ICC in the deep muscular plexus (ICC-DMP). We hypothesized that Ca2+ signaling in ICC-DMP can be modulated by inhibitory enteric neural input...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29676177/acetylcholine-induced-ciliary-beat-of-the-human-nasal-mucosa-is-regulated-by-the-pannexin-1-channel-and-purinergic-p2x-receptor
#15
Ba H Do, Toyoaki Ohbuchi, Tetsuro Wakasugi, Hiroki Koizumi, Mitsuru Yokoyama, Nobusuke Hohchi, Hideaki Suzuki
Background Airway mucociliary transport is an important function for the clearance of inhaled foreign particulates in the respiratory tract. The present study aimed at investigating the regulatory mechanism of acetylcholine (Ach)-induced ciliary beat of the human nasal mucosa in ex vivo. Methods The inferior turbinate mucosa was collected from patients with chronic hypertrophic rhinitis during endoscopic surgery. The mucosa was cut into thin strips, and ciliary movement was observed under a phase-contrast light microscope with a high-speed digital video camera...
January 1, 2018: American Journal of Rhinology & Allergy
https://www.readbyqxmd.com/read/29669994/mechanisms-of-atp-release-by-inflammatory-cells
#16
REVIEW
Michel Dosch, Joël Gerber, Fadi Jebbawi, Guido Beldi
Extracellular nucleotides (e.g., ATP, ADP, UTP, UDP) released by inflammatory cells interact with specific purinergic P2 type receptors to modulate their recruitment and activation. The focus of this review is on stimuli and mechanisms of extracellular nucleotide release and its consequences during inflammation. Necrosis leads to non-specific release of nucleotides, whereas specific release mechanisms include vesicular exocytosis and channel-mediated release via connexin or pannexin hemichannels. These release mechanisms allow stimulated inflammatory cells such as macrophages, neutrophils, and endothelial cells to fine-tune autocrine/paracrine responses during acute and chronic inflammation...
April 18, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29664737/insulin-regulates-astrocyte-gliotransmission-and-modulates-behavior
#17
Weikang Cai, Chang Xue, Masaji Sakaguchi, Masahiro Konishi, Alireza Shirazian, Heather A Ferris, Mengyao Li, Ruichao Yu, Andre Kleinridders, Emmanuel N Pothos, C Ronald Kahn
Complications of diabetes affect tissues throughout body, including central nervous system. Epidemiological studies show that diabetic patients have increased risk of depression, anxiety, age-related cognitive decline and Alzheimer's disease. Mice lacking insulin receptor in brain or on hypothalamic neurons display an array of metabolic abnormalities, however, the role of insulin action on astrocytes and neurobehaviors remains less well-studied. Here, we demonstrate that astrocytes are a direct insulin target in the brain and that knockout of IR on astrocytes causes increased anxiety and depressive-like behaviors in mice...
April 17, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/29652806/excessive-extracellular-atp-desensitizes-p2y2-and-p2x4-atp-receptors-provoking-surfactant-impairment-ending-in-ventilation-induced-lung-injury
#18
REVIEW
Djo Hasan, Joshua Satalin, Philip van der Zee, Michaela Kollisch-Singule, Paul Blankman, Atsuko Shono, Peter Somhorst, Corstiaan den Uil, Han Meeder, Toru Kotani, Gary F Nieman
Stretching the alveolar epithelial type I (AT I) cells controls the intercellular signaling for the exocytosis of surfactant by the AT II cells through the extracellular release of adenosine triphosphate (ATP) (purinergic signaling). Extracellular ATP is cleared by extracellular ATPases, maintaining its homeostasis and enabling the lung to adapt the exocytosis of surfactant to the demand. Vigorous deformation of the AT I cells by high mechanical power ventilation causes a massive release of extracellular ATP beyond the clearance capacity of the extracellular ATPases...
April 13, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29643381/pannexin-1-sustains-the-electrophysiological-responsiveness-of-retinal-ganglion-cells
#19
Galina Dvoriantchikova, Alexey Pronin, Sarah Kurtenbach, Abduqodir Toychiev, Tsung-Han Chou, Christopher W Yee, Breanne Prindeville, Junior Tayou, Vittorio Porciatti, Botir T Sagdullaev, Vladlen Z Slepak, Valery I Shestopalov
Pannexin 1 (Panx1) forms ATP-permeable membrane channels that play a key role in purinergic signaling in the nervous system in both normal and pathological conditions. In the retina, particularly high levels of Panx1 are found in retinal ganglion cells (RGCs), but the normal physiological function in these cells remains unclear. In this study, we used patch clamp recordings in the intact inner retina to show that evoked currents characteristic of Panx1 channel activity were detected only in RGCs, particularly in the OFF-type cells...
April 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29626161/extracellular-atp-activates-hyaluronan-synthase-2-has2-in-epidermal-keratinocytes-via-p2y-2-ca-2-signaling-and-mapk-pathways
#20
Leena Rauhala, Tiina Jokela, Riikka Kärnä, Geneviève Bart, Piia Takabe, Sanna Oikari, Markku I Tammi, Sanna Pasonen-Seppänen, Raija H Tammi
Extracellular nucleotides are used as signaling molecules by several cell types. In epidermis, their release is triggered by insults such as ultraviolet radiation, barrier disruption and wounding and by specific nerve terminals firing. Increased synthesis of hyaluronan, a ubiquitous extracellular matrix glycosaminoglycan, also occurs in response to stress, leading to the attractive hypothesis that nucleotide signaling and hyaluronan synthesis could also be linked. In HaCaT keratinocytes ATP caused a rapid and strong but transient activation of hyaluronan synthase 2 ( HAS2 ) expression via PKC-, CaMKII-, MAPK- and CREB-dependent pathways by activating the purinergic P2Y2 receptor...
April 6, 2018: Biochemical Journal
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