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https://www.readbyqxmd.com/read/29351460/macrophage-dependent-impairment-of-%C3%AE-2-adrenergic-autoreceptor-function-in-sympathetic-neurons-from-doca-salt-but-not-high-fat-diet-induced-hypertensive-rats
#1
Ryan Kwun-Yee Mui, Roxanne Fernandes, Hannah Garver, Nico van Rooijen, James J Galligan
DOCA-salt and obesity-related hypertension are associated with inflammation and sympathetic nervous system hyperactivity. Prejunctional α2-adrenergic receptors (α2ARs) provide negative feedback to norepinephrine release from sympathetic nerves through inhibition of N-type Ca2+ channels. Increased neuronal norepinephrine release in DOCA-salt and obesity-related hypertension occurs through impaired α2AR signaling, however, the mechanisms involved are unclear. Mesenteric arteries are resistance arteries that receive sympathetic innervation from the superior mesenteric and celiac ganglia (SMCG)...
January 5, 2018: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29341465/p2y12-deficiency-in-mouse-impairs-noradrenergic-system-in-brain-and-alters-anxiety-like-neurobehavior-and-memory
#2
Fang Zheng, Qiang Zhou, Yin Cao, Hailian Shi, Hui Wu, Beibei Zhang, Fei Huang, Xiaojun Wu
Purinergic receptor P2Y12 (P2Y12 ), a G protein-coupled (GPCR) purinergic receptor, is widely distributed in nervous system and involved in the progression of neurological diseases such as multiple sclerosis and neuropathic pain. The central noradrenergic system actively participates in a number of neurophysiological processes. Nevertheless, whether there is any direct relevance between P2Y12 and noradrenergic signal transduction remains unknown. In the present study, we tested the hypothesis that lack of P2Y12 impaired noradrenergic signal transduction in mouse brain...
January 17, 2018: Genes, Brain, and Behavior
https://www.readbyqxmd.com/read/29335257/staphylococcal-superantigens-use-lama2-as-a-coreceptor-to-activate-t-cells
#3
Zhigang Li, Joseph J Zeppa, Mark A Hancock, John K McCormick, Terence M Doherty, Geoffrey N Hendy, Joaquín Madrenas
Canonical Ag-dependent TCR signaling relies on activation of the src-family tyrosine kinase LCK. However, staphylococcal superantigens can trigger TCR signaling by activating an alternative pathway that is independent of LCK and utilizes a Gα11-containing G protein-coupled receptor (GPCR) leading to PLCβ activation. The molecules linking the superantigen to GPCR signaling are unknown. Using the ligand-receptor capture technology LRC-TriCEPS, we identified LAMA2, the α2 subunit of the extracellular matrix protein laminin, as the coreceptor for staphylococcal superantigens...
January 15, 2018: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29328000/conscious-sedation-with-dexmedetomidine-compared-with-asleep-awake-asleep-craniotomies-in-glioma-surgery-an-analysis-of-180-patients
#4
Eric Suero Molina, Stephanie Schipmann, Isabelle Mueller, Johannes Wölfer, Christian Ewelt, Matthias Maas, Benjamin Brokinkel, Walter Stummer
OBJECTIVE Awake craniotomies have become a feasible tool over time to treat brain tumors located in eloquent regions. Different techniques have been applied in neurooncology centers. Both "asleep-awake-asleep" (asleep) and "conscious sedation" were used subsequently at the authors' neurosurgical department. Since 2013, the authors have only performed conscious sedation surgeries, predominantly using the α2-receptor agonist dexmedetomidine as the anesthetic drug. The aim of this study was to compare both mentioned techniques and evaluate the clinical use of dexmedetomidine in the setting of awake craniotomies for glioma surgery...
January 12, 2018: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29321332/erk-is-a-critical-regulator-of-jc-polyomavirus-infection
#5
Jeanne K DuShane, Michael P Wilczek, Colleen L Mayberry, Melissa S Maginnis
The human JC polyomavirus (JCPyV) infects the majority of the population worldwide and presents as an asymptomatic, persistent infection in the kidney. In individuals who are immunocompromised, JCPyV can become reactivated and cause a lytic infection in the central nervous system resulting in the fatal, demyelinating disease progressive multifocal leukoencephalopathy (PML). Infection is initiated by interactions between the capsid protein viral protein 1 (VP1) and the α2,6-linked sialic acid on LSTc, while JCPyV internalization is facilitated by 5-hydroxytryptamine 2 receptors (5-HT2Rs)...
January 10, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29320746/sada-expressing-staphylococci-in-the-human-gut-show-increased-cell-adherence-and-internalization
#6
Arif Luqman, Mulugeta Nega, Minh-Thu Nguyen, Patrick Ebner, Friedrich Götz
A subgroup of biogenic amines, the so-called trace amines (TAs), are produced by mammals and bacteria and can act as neuromodulators. In the genus Staphylococcus, certain species are capable of producing TAs through the activity of staphylococcal aromatic amino acid decarboxylase (SadA). SadA decarboxylates aromatic amino acids to produce TAs, as well as dihydroxy phenylalanine and 5-hydroxytryptophan to thus produce the neurotransmitters dopamine and serotonin. SadA-expressing staphylococci were prevalent in the gut of most probands, where they are part of the human intestinal microflora...
January 9, 2018: Cell Reports
https://www.readbyqxmd.com/read/29314165/synthesis-of-c-14-labeled-gabaa-%C3%AE-2-%C3%AE-3-selective-partial-agonists-and-the-investigation-of-late-occurring-and-long-circulating-metabolites-of-gabaa-receptor-modulator-azd7325
#7
Markus Artelsmair, Chungang Gu, Richard J Lewis, Charles S Elmore
Anxiolytic activity has been associated with GABAA α2 and α3 subunits. Several target compounds were identified and required in C-14 labeled form to enable a better understanding of their DMPK properties. AZD7325 is a selective GABAA α2 and α3 receptor modulator intended for the treatment of anxiety through oral administration. A great number of AZD7325 metabolites were observed across species in vivo, whose identification was aided by [14 C]AZD7325. An interesting metabolic cyclization and aromatization pathway leading to the tricyclic core of M9 and the oxidative pathways to M10 and M42 are presented...
January 4, 2018: Journal of Labelled Compounds & Radiopharmaceuticals
https://www.readbyqxmd.com/read/29304162/adrenergic-receptors-inhibit-trpv1-activity-in-the-dorsal-root-ganglion-neurons-of-rats
#8
Yumi Matsushita, Miki Manabe, Naoki Kitamura, Izumi Shibuya
Transient receptor potential vanilloid type 1 (TRPV1) is a polymodal receptor channel that responds to multiple types of stimuli, such as heat, acid, mechanical pressure and some vanilloids. Capsaicin is the most commonly used vanilloid to stimulate TRPV1. TRPV1 channels are expressed in dorsal root ganglion neurons that extend to Aδ- and C-fibers and have a role in the transduction of noxious inputs to the skin into the electrical signals of the sensory nerve. Although noradrenergic nervous systems, including the descending antinociceptive system and the sympathetic nervous system, are known to modulate pain sensation, the functional association between TRPV1 and noradrenaline in primary sensory neurons has rarely been examined...
2018: PloS One
https://www.readbyqxmd.com/read/29299193/quetiapine-reverses-paclitaxel-induced-neuropathic-pain-in-mice-role-of-alpha2-adrenergic-receptors
#9
Alireza Abed, Mohammad Javad Khoshnoud, Mehdi Taghian, Mahbubeh Aliasgharzadeh, Azam Mesdaghinia
Objectives: Paclitaxel-induced peripheral neuropathy is a common adverse effect of cancer chemo -therapy. This neuropathy has a profound impact on quality of life and patient's survival. Preventing and treating paclitaxel-induced peripheral neuropathy is a major concern. First- and second-generation antipsychotics have shown analgesic effects both in humans and animals. Quetiapine is a novel atypical antipsychotic with low propensity to induce extrapyramidal or hyperprolactinemia side effects...
November 2017: Iranian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/29284857/to-compare-the-effect-of-two-different-doses-of-dexmedetomidine-on-the-attenuation-of-airway-and-pressor-response-during-tracheostomy-tube-change-in-traumatic-brain-injury-patients
#10
Abdul Alim Khan, Neeraj Kumar, Yashpal Singh, Atul Kumar Singh, Sharad Kumar Mathur
Background: Tracheostomy tube (TT) change is the common procedure in trauma Intensive Care Unit (ICU) and almost always associated with cough reflex, increase in blood pressure, and heart rate. Dexmedetomidine (DEX) is a selective α2-adrenergic receptor agonist well studied for the prevention of pressor response during laryngoscopy and extubation, but literature on prevention of pressor response during TT change is lacking. Aims: The aim of this study is to compare two doses (0...
October 2017: Anesthesia, Essays and Researches
https://www.readbyqxmd.com/read/29282218/a-novel-role-for-the-macrophage-galactose-type-lectin-mgl-receptor-in-mediating-von-willebrand-factor-clearance
#11
Soracha E Ward, Jamie M O'Sullivan, Clive Drakeford, Sonia Aguila, Christopher N Jondle, Jyotika Sharma, Padraic G Fallon, Teresa M Brophy, Roger J S Preston, Paul Smyth, Orla Sheils, Alain Chion, James S O'Donnell
Previous studies have shown that loss of terminal sialic acid causes enhanced VWF clearance through the Ashwell-Morrell receptor (AMR). In this study we investigated (i) the specific importance of N- versus O-linked sialic acid in protecting against VWF clearance (ii) whether additional receptors contribute to the reduced half-life of hyposialylated VWF. α2-3 linked sialic acid accounts for <20% of total sialic acid and is predominantly expressed on VWF O-glycans. Nevertheless, specific digestion with α2-3 neuraminidase (α2-3Neu-VWF) was sufficient to cause markedly enhanced VWF clearance...
December 27, 2017: Blood
https://www.readbyqxmd.com/read/29273459/mirtazapine-impairs-acquisition-and-reinstatement-of-cocaine-induced-place-preference-in-rats
#12
Susana Barbosa-Méndez, Maura Matus-Ortega, Salomón Jacinto-Gutiérrez, Alberto Salazar-Juárez
Exposure to cues previously associated with drug use and the environment can trigger intense craving and drug-seeking, often leading to relapse in individuals with substance use disorders. Several studies suggest that the decrease in the effects of the cues and the environment could help maintain abstinence from drug use in individuals abusing drugs. Mirtazapine, an antagonist of the noradrenergic (NE) α2 receptor and the 5-HT2A/C and 5-HT3 receptors has demonstrated efficacy in reducing the rewarding effect of different drugs...
December 19, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29262310/binding-of-cholera-toxin-b-subunit-to-intestinal-epithelial-cells
#13
Elena V Navolotskaya, Vladimir B Sadovnikov, Valery M Lipkin, Vladimir P Zav'yalov
We have prepared 125I-labeled cholera toxin B subunit (125I-labeled CT-B, a specific activity of 98Ci/mmol) and found that it binds to rat IEC-6 and human Caco-2 intestinal epithelial cells with high affinity (Kd 3.6 and 3.7nM, respectively). The binding of labeled protein was completely inhibited by unlabeled thymosin-α1 (TM-α1), interferon-α2 (IFN-α2), and the synthetic peptide LKEKK that corresponds to residues 16-20 in TM-α1 and 131-135 in IFN-α2, but was not inhibited by the synthetic peptide KKEKL with inverted amino acid sequence (Ki>10μM)...
December 17, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/29242172/curcumin-enhances-lxr%C3%AE-in-an-amp-activated-protein-kinase-dependent-manner-in-human-macrophages
#14
Javier Sáenz, Gonzalo Alba, María E Reyes-Quiroz, Isabel Geniz, Juan Jiménez, Francisco Sobrino, Consuelo Santa-María
Liver X receptor alpha (LXRα) is a nuclear receptor involved in cholesterol homeostasis. Curcumin, a traditional Chinese derivative from the rhizomes of Curcuma longa and a well-known AMP-activated protein kinase (AMPK) activator, possess hypocholesterolemic activity, however, the possible link between AMPK and cholesterol is unknown. In this study, we have investigated whether curcumin regulates metabolic changes in cholesterol metabolism via LXRα in THP-1 human macrophages, the cells implicated in atheroma plaques formation...
November 16, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/29236669/-optically-dissecting-brain-nicotinic-receptor-function-with-photo-controllable-designer-receptors
#15
Romain Durand-de Cuttoli, Sarah Mondoloni, Alexandre Mourot
Nicotinic acetylcholine receptors (nAChRs) are pentameric ligand-gated ion channels widely expressed in the central nervous system and the periphery. They play an important modulatory role in learning, memory and attention, and have been implicated in various diseases such as Alzheimer's disease, Parkinson's disease, epilepsy, schizophrenia and addiction. These receptors are activated by the endogenous neurotransmitter acetylcholine, or by nicotine, the alkaloid found in tobacco leaves. Both molecules open the ion channel and cause the movement of cations across the membrane, which directly affects neuronal excitability and synaptic plasticity...
2017: Biologie Aujourd'hui
https://www.readbyqxmd.com/read/29235261/interferon-%C3%AE-2-and-interferon-%C3%AE-induce-the-degranulation-independent-production-of-vegf-a-and-il-1-receptor-antagonist-and-other-mediators-from-human-mast-cells
#16
Sharon A Oldford, Suzanne P Salsman, Liliana Portales-Cervantes, Raidan Alyazidi, Robert Anderson, Ian D Haidl, Jean S Marshall
BACKGROUND: Mast cells are resident immune effector cells, often studied in the context of allergic disease. Found in substantial numbers at sites of potential infection they are increased at sites of angiogenesis and can be pivotal for the sensing and clearance of a variety of pathogens. Interferons (IFNs) are cytokines that are critical for host defence against intracellular pathogens. Increased levels of IFNs are observed during viral infection and in autoimmune diseases. IFNs are also widely used therapeutically and have been examined in the therapy of severe asthma...
December 13, 2017: Immunity, Inflammation and Disease
https://www.readbyqxmd.com/read/29233887/st6gal-i-sialyltransferase-promotes-tumor-necrosis-factor-tnf-mediated-cancer-cell-survival-via-sialylation-of-the-tnf-receptor-1-tnfr1-death-receptor
#17
Andrew T Holdbrooks, Colleen M Britain, Susan L Bellis
Activation of the TNFR1 death receptor by TNF induces either cell survival or cell death. However, the mechanisms mediating these distinct outcomes remain poorly understood. In the present study, we report that the ST6Gal-I sialyltransferase, an enzyme upregulated in numerous cancers, sialylates TNFR1, and thereby protects tumor cells from TNF-induced apoptosis. Using pancreatic and ovarian cancer cells with ST6Gal-I knockdown or overexpression, we determined that α2-6 sialylation of TNFR1 had no effect on early TNF-induced signaling events including the rapid activation of NFκB, JNK, ERK, and Akt (occurring within 15m)...
December 12, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29230587/arterial-wall-hypertrophy-is-ameliorated-by-%C3%AE-2-adrenergic-receptor-antagonist-or-aliskiren-in-kidneys-of-angiotensinogen-knockout-mice
#18
Haruka Nakamori, Shin-Ichiro Yoshida, Hiroaki Ishiguro, Shota Suzuki, Hiroaki Yasuzaki, Tatsuo Hashimoto, Tomoaki Ishigami, Nobuhito Hirawa, Yoshiyuki Toya, Satoshi Umemura, Kouichi Tamura
BACKGROUND: Arterial hypertrophy and interstitial fibrosis are important characteristics in kidneys of angiotensinogen-knockout (Atg -/-) mice. In these mice, which exhibit polyuria and hypotension, sympathetic nerve signaling is estimated to be compensatorily hyperactive. Furthermore, transforming growth factor (TGF)-β1 is overexpressed in mice kidneys. To determine whether sympathetic nerve signaling and TGF-β1 exacerbate arterial hypertrophy and interstitial fibrosis, intervention studies of such signaling are required...
December 11, 2017: Clinical and Experimental Nephrology
https://www.readbyqxmd.com/read/29228713/cell-surface-thomsen-friedenreich-proteome-profiling-of-metastatic-prostate-cancer-cells-reveals-potential-link-with-cancer-stem-cell-like-phenotype
#19
Feng Li, Olga V Glinskii, Brian P Mooney, Kate Rittenhouse-Olson, Kenneth J Pienta, Vladislav V Glinsky
The tumor-associated Thomsen-Friedenreich glycoantigen (TF-Ag) plays an important role in hematogenous metastasis of multiple cancers. The LTQ Orbitrap LC-MS/MS mass spectrometry analysis of cell surface TF-Ag proteome of metastatic prostate cancer cells reveals that several cell surface glycoproteins expressing this carbohydrate antigen in prostate cancer (CD44, α2 integrin, β1 integrin, CD49f, CD133, CD59, EphA2, CD138, transferrin receptor, profilin) are either known as stem cell markers or control important cancer stem-like cell functions...
November 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/29225214/noradrenergic-effects-in-rat-sacral-autonomic-nucleus-using-in-vitro-slice-patch-clamp-recordings
#20
Masahiro Kawatani, Nozomi Akimoto, Akihiro Yamada, Hidemasa Furue, Masahito Kawatani
Noradrenergic modulation has been frequently discussed in the context of neural activities that are related to pelvic organs. The sacral preganglionic nucleus (SPN) is a spinal nucleus containing parasympathetic preganglionic neurons that send fibers to pelvic nerves. In spite of the abundant presence of noradrenergic fibers around the SPN, the effects of noradrenaline (NA) remain obscure. To explore this issue, NA (50 μM) was applied to parasympathetic preganglionic neurons in the SPN during whole-cell patch clamp recording...
2017: Biomedical Research
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