keyword
MENU ▼
Read by QxMD icon Read
search

Purinergic

keyword
https://www.readbyqxmd.com/read/28093236/extracellular-atp-and-adenosine-the-yin-and-yang-in-immune-responses
#1
REVIEW
M M Faas, T Sáez, P de Vos
Extracellular adenosine 5'-triphosphate (ATP) and adenosine molecules are intimately involved in immune responses. ATP is mostly a pro-inflammatory molecule and is released during hypoxic condition and by necrotic cells, as well as by activated immune cells and endothelial cells. However, under certain conditions, for instance at low concentrations or at prolonged exposure, ATP may also have anti-inflammatory properties. Extracellular ATP can activate both P2X and P2Y purinergic receptors. Extracellular ATP can be hydrolyzed into adenosine in a two-step enzymatic process involving the ectonucleotidases CD39 (ecto-apyrase) and CD73...
January 13, 2017: Molecular Aspects of Medicine
https://www.readbyqxmd.com/read/28087471/il-6-promotes-m2-macrophage-polarization-by-modulating-purinergic-signaling-and-regulates-the-lethal-release-of-nitric-oxide-during-trypanosoma-cruzi-infection
#2
Liliana M Sanmarco, Nicolás E Ponce, Laura M Visconti, Natalia Eberhardt, Martin G Theumer, Ángel R Minguez, Maria P Aoki
The production of nitric oxide (NO) is a key defense mechanism against intracellular pathogens but it must be tightly controlled in order to avoid excessive detrimental oxidative stress. In this study we described a novel mechanism through which interleukin (IL)-6 mediates the regulation of NO release induced in response to Trypanosoma cruzi infection. Using a murine model of Chagas disease, we found that, in contrast to C57BL/6 wild type (WT) mice, IL-6-deficient (IL6KO) mice exhibited a dramatic increase in plasma NO levels concomitant with a significantly higher amount of circulating IL-1β and inflammatory monocytes...
January 10, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28073370/expression-site-of-p2ry12-in-residential-microglial-cells-in-astrocytomas-correlates-with-m1-and-m2-marker-expression-and-tumor-grade
#3
Changbin Zhu, Johan M Kros, Marcel van der Weiden, PingPin Zheng, Caroline Cheng, Dana A M Mustafa
The role of resident microglial cells in the pathogenesis and progression of glial tumors is still obscure mainly due to a lack of specific markers. Recently P2RY12, a P2 purinergic receptor, was introduced as a specific marker for microglial cells under normal and pathologic conditions. Here we analyzed the expression of P2RY12 in astrocytomas of various malignancy grades in relation to markers for M1 and M2 macrophage activation profiles by using two web-based glioma datasets and confocal immunohistochemistry to 28 astrocytoma samples grades II-IV...
January 10, 2017: Acta Neuropathologica Communications
https://www.readbyqxmd.com/read/28069296/inflammatory-early-events-associated-to-the-role-of-p2x7-receptor-in-acute-murine-toxoplasmosis
#4
Gladys Corrêa, Carolina de Almeida Lindenberg, Aline Cristina de Abreu Moreira-Souza, Luiz Eduardo Baggio Savio, Christina Maeda Takiya, Camila Marques-da-Silva, Rossiane Claudia Vommaro, Robson Coutinho-Silva
Activation of the purinergic P2X7 receptor by extracellular ATP (eATP) potentiates proinflammatory responses during infections by intracellular pathogens. Extracellular ATP triggers an antimicrobial response in macrophages infected with Toxoplasma gondii in vitro, suggesting that purinergic signaling may stimulate host defense mechanisms against toxoplasmosis. Here, we provide in vivo evidence in support of this hypothesis, by showing that P2X7(-/-) mice are more susceptible than P2X7(+/+) mice to acute infection by the RH strain of T...
December 30, 2016: Immunobiology
https://www.readbyqxmd.com/read/28063919/proteomic-analysis-of-the-protective-effects-of-aqueous-bark-extract-of-terminalia-arjuna-roxb-on-isoproterenol-induced-cardiac-hypertrophy-in-rats
#5
Santosh Kumar, Md Jahangir Alam, Pankaj Prabhakar, Sayeed Ahmad, Subir K Maulik, Manish Sharma, Shyamal K Goswami
ETHNOPHARMACOLOGICAL RELEVANCE: Aqueous bark extract of Terminalia arjuna (TA) has been in use as an ethnomedicine for cardiovascular ailments in the Indian subcontinent for centuries. Studies using hemodynamic, ROS scavenging and anti-inflammatory parameters in animal models have shown its anti-atherogenic, hypotensive, inotropic, anti-inflammatory effects. However, details analysis on its effects on established molecular and cell biological markers are a prerequisite for its wider acceptance to the medical community...
January 4, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28062289/evaluation-of-p2x7-receptor-expression-in-peripheral-lymphocytes-and-immune-profile-from-patients-with-indeterminate-form-of-chagas-disease
#6
Viviane do Carmo Gonçalves Souza, Joabel Tonellotto Dos Santos, Fernanda Licker Cabral, Fernanda Barbisan, Maria Isabel Azevedo, Luiz Felipe Dias Carli, Sonia de Avila Botton, Jeandre Augusto Dos Santos Jaques, Daniela Bitencourt Rosa Leal
Chagas disease (CD) is caused by Trypanosoma cruzi, an intracellular protozoan which is a potent stimulator of cell-mediated immunity. In the indeterminate form of CD (IFCD) a modulation between pro- and anti-inflammatory responses establishes a host-parasite adaptation. It was previously demonstrated that purinergic ecto-enzymes regulates extracellular ATP and adenosine levels, influencing immune and inflammatory processes during IFCD. In inflammatory sites ATP, as well as its degradation product, adenosine, function as signaling molecules and immunoregulators through the activation of purinergic receptors...
January 3, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28061416/purinergic-p2x7-receptor-mediates-acetaldehyde-induced-hepatic-stellate-cells-activation-via-pkc-dependent-gsk3%C3%AE-pathway
#7
Xiaojuan Wu, Yuhui Wang, Sheng Wang, Rixiang Xu, Xiongwen Lv
The activation of hepatic stellate cells (HSCs) is an essential part in the development of alcoholic liver fibrosis (ALF). In this study, stimulated HSCs with 200μM acetaldehyde for 48h was used to imitate alcoholic liver fibrosis in vitro. The western blot and qRT-PCR results showed that P2X7R expression was significantly increased in the activation of HSCs after acetaldehyde treatment. Interestingly, activation of P2X7R by stimulating with P2X7R agonist BzATP significantly promoted acetaldehyde-induced CyclinD1 expression, cell proportion in S phase, inflammatory response, and the protein and mRNA levels of α-SMA, collagen I...
February 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/28058465/fish-oil-supplementation-attenuates-neuroinflammation-and-alleviates-depressive-like-behavior-in-rats-submitted-to-repeated-lipopolysaccharide
#8
Ruili Dang, Xueyuan Zhou, Mimi Tang, Pengfei Xu, Xiaoxue Gong, Yuanyuan Liu, Hongxiao Jiao, Pei Jiang
PURPOSE: Depression is frequently associated with inflammation, whereas omega-3 polyunsaturated fatty acids (PUFAs) primarily found in fish oil possess anti-inflammatory properties. Although converging studies suggest an antidepressant effect of PUFAs, there is limited evidence directly linking the neuro-immune modulating features of PUFAs to the antidepressant actions. METHODS: Therefore, we assessed the effects of fish oil (FO) supplementation on behavioral changes, inflammatory cytokine expression and oxidative reactions in frontal cortex and hippocampus of rats following repeated peripheral immune challenge by lipopolysaccharide (LPS) for 2 weeks (500 μg/kg every other day)...
January 5, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28057794/purinergic-signaling-in-the-cardiovascular-system
#9
REVIEW
Geoffrey Burnstock
There is nervous control of the heart by ATP as a cotransmitter in sympathetic, parasympathetic, and sensory-motor nerves, as well as in intracardiac neurons. Centers in the brain control heart activities and vagal cardiovascular reflexes involve purines. Adenine nucleotides and nucleosides act on purinoceptors on cardiomyocytes, AV and SA nodes, cardiac fibroblasts, and coronary blood vessels. Vascular tone is controlled by a dual mechanism. ATP, released from perivascular sympathetic nerves, causes vasoconstriction largely via P2X1 receptors...
January 6, 2017: Circulation Research
https://www.readbyqxmd.com/read/28039004/localized-inhibition-of-p2x7r-at-the-spinal-cord-injury-site-improves-neurogenic-bladder-dysfunction-by-decreasing-urothelial-p2x3r-expression-in-rats
#10
Alvaro Munoz, Iman K Yazdi, Xiufeng Tang, Carolina Rivera, Nima Taghipour, Robert G Grossman, Timothy B Boone, Ennio Tasciotti
AIMS: Reestablishment of bladder function in patients with spinal cord injury (SCI) is a clinical priority. Our objectives were to determine whether SCI-localized inhibition of purinergic P2X7 receptors (P2X7R) improve bladder function by decreasing afferent signals mediated by urothelial P2X3R. MAIN METHODS: Systemic inhibition of P2X7R may improve locomotion in rodent SCI models; however, beneficial effects on bladder function and its physiological mechanisms have not been evaluated...
December 27, 2016: Life Sciences
https://www.readbyqxmd.com/read/28038380/the-p2y2-nucleotide-receptor-is-an-inhibitor-of-vascular-calcification
#11
Shaomin Qian, Jenna N Regan, Maxwell T Shelton, April Hoggatt, Khalid S Mohammad, Paul B Herring, Cheikh I Seye
BACKGROUND AND AIMS: Mutations in the 5'-nucleotidase ecto (NT5E) gene that encodes CD73, a nucleotidase that converts AMP to adenosine, are linked to arterial calcification. However, the role of purinergic receptor signaling in the pathology of intimal calcification is not well understood. In this study, we examined whether extracellular nucleotides acting via P2Y2 receptor (P2Y2R) modulate arterial intimal calcification, a condition highly correlated with cardiovascular morbidity. METHODS: Apolipoprotein E, P2Y2R double knockout mice (ApoE(-/-)P2Y2R(-/-)) were used to determine the effect of P2Y2R deficiency on vascular calcification in vivo...
December 15, 2016: Atherosclerosis
https://www.readbyqxmd.com/read/28035410/inhibiting-purinergic-p2x7-receptors-with-the-antagonist-brilliant-blue-g-is-neuroprotective-in-an-intranigral-lipopolysaccharide-animal-model-of-parkinson-s-disease
#12
Xin-Hong Wang, Xin Xie, Xiao-Guang Luo, Hong Shang, Zhi-Yi He
Parkinson's disease (PD) is a common neurodegenerative disorder, which is characterized by the selective and progressive death of dopaminergic (DA) neurons in the substantia nigra. Increasing evidence suggests that inflammation is important in the degeneration of DA neurons. The purinergic receptor subtype P2X7 receptor (P2X7R) is key in the activation and proliferation of microglia. The present study aimed to examine whether inhibiting purinergic P2X7 receptors is neuroprotective in a rat model of PD, specifically via inhibiting p38 mitogen‑activated protein kinase (MAPK)...
February 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28034895/impaired-aortic-contractility-to-uridine-adenosine-tetraphosphate-in-angiotensin-ii-induced-hypertensive-mice-receptor-desensitization
#13
Zhichao Zhou, Vishal R Yadav, Changyan Sun, Bunyen Teng, Jamal S Mustafa
OBJECTIVE: We previously showed that uridine adenosine tetraphosphate (Up4A)-mediated aortic contraction is partly mediated through purinergic P2X1 receptors (P2X1R). It has been reported that the plasma level of Up4A is elevated in hypertensive patients, implying a potential role for Up4A-P2X1R signaling in hypertension. This study investigated the vasoactive effect of Up4A in aortas isolated from angiotensin (Ang) II-infused (21 days) hypertensive mice. METHODS: Blood pressure was measured by tail cuff plethysmography...
December 29, 2016: American Journal of Hypertension
https://www.readbyqxmd.com/read/28031477/lipin-2-regulates-nlrp3-inflammasome-by-affecting-p2x7-receptor-activation
#14
Gema Lordén, Itziar Sanjuán-García, Nagore de Pablo, Clara Meana, Inés Alvarez-Miguel, M Teresa Pérez-García, Pablo Pelegrín, Jesús Balsinde, María A Balboa
Mutations in human LPIN2 produce a disease known as Majeed syndrome, the clinical manifestations of which are ameliorated by strategies that block IL-1β or its receptor. However the role of lipin-2 during IL-1β production remains elusive. We show here that lipin-2 controls excessive IL-1β formation in primary human and mouse macrophages by several mechanisms, including activation of the inflammasome NLRP3. Lipin-2 regulates MAPK activation, which mediates synthesis of pro-IL-1β during inflammasome priming...
December 28, 2016: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28030754/tonotopic-action-potential-tuning-of-maturing-auditory-neurons-through-endogenous-atp
#15
Saša Jovanovic, Tamara Radulovic, Claudio Coddou, Beatrice Dietz, Jana Nerlich, Stanko S Stojilkovic, Rudolf Rübsamen, Ivan Milenkovic
KEY POINTS: Following the genetically controlled formation of neuronal circuits, early firing activity guides the development of sensory maps in the auditory, visual and somatosensory system. However, it is not clear whether the activity of central auditory neurons is specifically regulated depending on the position within the sensory map. In the ventral cochlear nucleus, the first central station along the auditory pathway, we describe a mechanism through which paracrine ATP signalling enhances firing in a cell-specific and tonotopically-determined manner...
November 7, 2016: Journal of Physiology
https://www.readbyqxmd.com/read/28028627/effect-of-electroacupuncture-on-the-cervicospinal-p2x7-receptor-fractalkine-cx3cr1-signaling-pathway-in-a-rat-neck-incision-pain-model
#16
Y H Gao, C W Li, J Y Wang, L H Tan, C L Duanmu, X H Jing, X R Chang, J L Liu
Increasing evidence supports that acupuncture intervention is an effective approach for intraoperative and postoperative pain. Neuron-microglia crosstalk, mediated by the purinergic P2X7 receptor (R)/fractalkine/CX3CR1 cascade in the spinal cord dorsal horn, plays a pivotal role in pain processing. However, its involvement in the analgesic effect of electroacupuncture (EA) remains unclear. In this study, a rat neck-incision pain model was established by making a longitudinal incision along the midline of the neck and subsequent repeated mechanical stimulation...
December 27, 2016: Purinergic Signalling
https://www.readbyqxmd.com/read/28011630/a-polycycstin-type-transient-receptor-potential-trp-channel-that-is-activated-by-atp
#17
David Traynor, Robert R Kay
ATP and ADP are ancient extra-cellular signalling molecules that in Dictyostelium amoebae cause rapid, transient increases in cytosolic calcium due to an influx through the plasma membrane. This response is independent of hetero-trimeric G-proteins, the putative IP3 receptor IplA and all P2X channels. We show, unexpectedly, that it is abolished in mutants of the polycystin-type transient receptor potential channel, TrpP. Responses to the chemoattractants cyclic-AMP and folic acid are unaffected in TrpP mutants...
December 23, 2016: Biology Open
https://www.readbyqxmd.com/read/28010756/deregulation-of-adenosine-receptors-in-psoriatic-epidermis-an-option-for-therapeutic-treatment
#18
Stefania Merighi, Pier Andrea Borea, Katia Varani, Stefania Gessi
Purinergic signaling is involved in psoriasis, a chronic skin disease characterized by increased epidermis cell growth. In particular, Andrés et al. focus on the keratinocyte biology modulated by adenosine receptors providing evidence that the A2B subtype plays a prominent role in the reduction of keratinocyte proliferation whereas A2A and A2B agonists have antiinflammatory effects independent of adenosine receptors. The authors report that psoriatic epidermis presents a deregulated adenosine receptor expression profile with reduced A2B and increased A2A...
January 2017: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/28007536/conspecific-alarm-substance-differently-alters-group-behavior-of-zebrafish-populations-putative-involvement-of-cholinergic-and-purinergic-signaling-in-anxiety-and-fear-like-responses
#19
Julia Canzian, Barbara D Fontana, Vanessa A Quadros, Denis B Rosemberg
The zebrafish (Danio rerio) is an emergent model organism for assessing fear and anxiety-like phenotypes. The short fin wild type (WT), and leopard (leo) are two zebrafish populations that present several behavioral differences, in which leo displays pronounced defensive responses. Mounting evidence suggests a modulatory role for cholinergic and purinergic signaling in fear and anxiety, but the involvement of these neurotransmitter systems in the behavioral profile of zebrafish is obscure. Here we tested whether the acute exposure to conspecific alarm substance (AS), an experimental protocol that induces fear, alters shoaling behavior, diving response, acetylcholinesterase (AChE) activity, and nucleotide hydrolysis in brain tissue of WT and leo...
December 19, 2016: Behavioural Brain Research
https://www.readbyqxmd.com/read/28004778/glycosides-from-edible-sea-cucumbers-stimulate-macrophages-via-purinergic-receptors
#20
Dmitry Aminin, Evgeny Pislyagin, Maxim Astashev, Andrey Es'kov, Valery Kozhemyako, Sergei Avilov, Elena Zelepuga, Ekaterina Yurchenko, Leonid Kaluzhskiy, Emma Kozlovskaya, Alexis Ivanov, Valentin Stonik
Since ancient times, edible sea cucumbers have been considered a jewel of the seabed and used in Asian folk medicine for stimulation of resistance against different diseases. However, the power of this sea food has not been established on a molecular level. A particular group of triterpene glycosides was found to be characteristic metabolites of the animals, responsible for this biological action. Using one of them, cucumarioside A2-2 (CA2-2) from the edible Cucumaria japonica species as an example as well as inhibitory analysis, patch-clamp on single macrophages, small interfering RNA technique, immunoblotting, SPR analysis, computer modeling and other methods, we demonstrate low doses of CA2-2 specifically to interact with P2X receptors (predominantly P2X4) on membranes of mature macrophages, enhancing the reversible ATP-dependent Ca(2+) intake and recovering Ca(2+) transport at inactivation of these receptors...
December 22, 2016: Scientific Reports
keyword
keyword
81978
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"