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https://www.readbyqxmd.com/read/28631520/striatal-changes-underlie-mpep-mediated-suppression-of-the-acquisition-and-expression-of-pramipexole-induced-place-preference-in-an-alpha-synuclein-rat-model-of-parkinson-s-disease
#1
Simon Loiodice, Portia McGhan, Vitalina Gryshkova, Renaud Fleurance, David Dardou, Aziz Hafidi, Andre Nogueira da Costa, Franck Durif
Impulsive-compulsive disorders in Parkinson's disease patients have been described as behavioural or substance addictions including pathological gambling or compulsive medication use of dopamine replacement therapy. A substantial gap remains in the understanding of these disorders. We previously demonstrated that the rewarding effect of the D2/D3 agonist pramipexole was enhanced after repeated exposure to L-dopa and alpha-synuclein mediated dopaminergic nigral loss with specific transcriptional signatures suggesting a key involvement of the glutamatergic pathway...
June 1, 2017: Journal of Psychopharmacology
https://www.readbyqxmd.com/read/28630404/activation-of-d1r-pka-mtor-signaling-cascade-in-medial-prefrontal-cortex-underlying-the-antidepressant-effects-of-l-spd
#2
Bing Zhang, Fei Guo, Yuqin Ma, Yingcai Song, Rong Lin, Fu-Yi Shen, Guo-Zhang Jin, Yang Li, Zhi-Qiang Liu
Major depressive disorder (MDD) is a common neuropsychiatric disorder characterized by diverse symptoms. Although several antidepressants can influence dopamine system in the medial prefrontal cortex (mPFC), but the role of D1R or D2R subtypes of dopamine receptor during anti-depression process is still vague in PFC region. To address this question, we investigate the antidepressant effect of levo-stepholidine (l-SPD), an antipsychotic medication with unique pharmacological profile of D1R agonism and D2R antagonism, and clarified its molecular mechanisms in the mPFC...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28630327/virus-induced-inflammasome-activation-is-suppressed-by-prostaglandin-d2-dp1-signaling
#3
Rahul Vijay, Anthony R Fehr, Ann M Janowski, Jeremiah Athmer, Dorthea L Wheeler, Matthew Grunewald, Ramakrishna Sompallae, Samarchith P Kurup, David K Meyerholz, Fayyaz S Sutterwala, Shuh Narumiya, Stanley Perlman
Prostaglandin D2 (PGD2), an eicosanoid with both pro- and anti-inflammatory properties, is the most abundantly expressed prostaglandin in the brain. Here we show that PGD2 signaling through the D-prostanoid receptor 1 (DP1) receptor is necessary for optimal microglia/macrophage activation and IFN expression after infection with a neurotropic coronavirus. Genome-wide expression analyses indicated that PGD2/DP1 signaling is required for up-regulation of a putative inflammasome inhibitor, PYDC3, in CD11b(+) cells in the CNS of infected mice...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28630021/thyroid-hormone-signaling-and-deiodinase-actions-in-muscle-stem-progenitor-cells
#4
REVIEW
Raffaele Ambrosio, Maria Angela De Stefano, Daniela Di Girolamo, Domenico Salvatore
Thyroid hormone (TH) regulates such crucial biological functions as normal growth, development and metabolism of nearly all vertebrate tissues. In skeletal muscle, TH plays a critical role in regulating the function of satellite cells, the bona fide skeletal muscle stem cells. Deiodinases (D2 and D3) have been found to modulate the expression of various TH target genes in satellite cells. Regulation of the expression and activity of the deiodinases constitutes a cell-autonomous, pre-receptor mechanism that controls crucial steps during the various phases of myogenesis...
June 16, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28629580/folding-underlies-bidirectional-role-of-gpr37-pael-r-in-parkinson-disease
#5
REVIEW
Lina Leinartaité, Per Svenningsson
Since conformational flexibility, which is required for the function of a protein, comes at the expense of structural stability, many proteins, including G-protein-coupled receptors (GPCRs), are under constant risk of misfolding and aggregation. In this regard GPR37 (also named PAEL-R and ETBR-LP-1) takes a prominent role, particularly in relation to Parkinson disease (PD). GPR37 is a substrate for parkin and accumulates abnormally in autosomal recessive juvenile parkinsonism, contributing to endoplasmic reticulum stress and death of dopaminergic neurons...
June 16, 2017: Trends in Pharmacological Sciences
https://www.readbyqxmd.com/read/28628756/atypical-sympathomimetic-drug-lerimazoline-mediates-contractile-effects-in-rat-aorta-predominantly-by-5-ht2a-receptors
#6
Eldina Rizvić, Goran Janković, Slađana Kostić-Rajačić, Miroslav M Savić
Lerimazoline is a sympathomimetic drug that belongs to the imidazoline class of compounds, and is used as a nasal decongestant. Studies on lerimazoline are rare, and its pharmacological profile is not completely understood. Here, we analyzed the affinity of lerimazoline for dopamine receptor D2, serotonin 5-HT1A and 5-HT2A receptors and α1-adrenoceptor, and investigated lerimazoline contractile effects in isolated rat thoracic aorta. We also determined the effect of several antagonists on the contractile response to lerimazoline, including prazosin (α1-adrenoceptor antagonist), RX 821002 and rauwolscine (α2-adrenoceptor antagonists), JP 1302 (α2C-adrenoceptor antagonist), methiothepin (non-selective 5-HT receptor antagonist), SB 224289 (5-HT1B receptor antagonist), BRL 15572 (5-HT1D receptor antagonist), and ketanserin (5-HT2A receptor antagonist)...
June 19, 2017: Bosnian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/28626925/stoichiometric-analysis-of-oligomeric-states-of-three-class-a-gpcrs-chemokine-cxcr4-dopamine-d2-and-prostaglandin-ep1-receptors-on-living-cells
#7
Kenichi Kawano, Tetsuya Yagi, Nozomu Fukada, Yoshiaki Yano, Katsumi Matsuzaki
G-protein-coupled receptors (GPCRs) form the largest family of transmembrane receptors, and their oligomerization has been suggested to be related to their functions. Despite extensive studies, their oligomeric states are highly controversial. One of the reasons is the overestimation of oligomerization by conventional methods. We recently established a stoichiometric analysis method for precisely determining the oligomeric state of membrane proteins on living cells with the combined use of the coiled-coil labeling method and a spectral imaging technique and showed that the prototypical class-A GPCR β2 -adrenergic receptor (β2 AR) did not form functional oligomers...
June 18, 2017: Journal of Peptide Science: An Official Publication of the European Peptide Society
https://www.readbyqxmd.com/read/28625719/atypical-dopamine-transporter-inhibitors-r-modafinil-and-jhw-007-differentially-affect-d2-autoreceptor-neurotransmission-and-the-firing-rate-of-midbrain-dopamine-neurons
#8
Alicia J Avelar, J Cao, Amy Hauck Newman, Michael J Beckstead
Abuse of psychostimulants like cocaine that inhibit dopamine (DA) reuptake through the dopamine transporter (DAT) represents a major public health issue, however FDA-approved pharmacotherapies have yet to be developed. Recently a class of ligands termed "atypical DAT inhibitors" has gained attention due to their range of effectiveness in increasing extracellular dopamine (DA) levels without demonstrating significant abuse liability. These compounds not only hold promise as therapeutic agents to treat stimulant use disorders but also as experimental tools to improve our understanding of DAT function...
June 15, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28623711/contribution-of-dopaminergic-and-noradrenergic-systems-in-the-antinociceptive-effect-of-%C3%AE-phenylalanyl-acetophenone
#9
Fernanda S S Sousa, Roberta G Anversa, Paloma T Birmann, Maurice N de Souza, Renata Balaguez, Diego Alves, Cristiane Luchese, Ethel A Wilhelm, Lucielli Savegnago
BACKGROUND: This study evaluated the antinociceptive action of α-(phenylalanyl) acetophenone (PSAP) in mice. METHODS: Evaluated whether the serotonergic, adrenergic and dopaminergic systems are involved in PSAP antinociceptive activity. PSAP was administered intragastrically (ig) 30min prior to formalin or glutamate test and compared with a standard drug, meloxicam (10mg/kg, ig). RESULTS: The treatment with PSAP (10-50mg/kg) caused inhibition in the neurogenic phase and reduced the paw oedema caused by intraplantar (ipl) injection of formalin...
March 27, 2017: Pharmacological Reports: PR
https://www.readbyqxmd.com/read/28623450/the-relationship-between-excitement-symptom-severity-and-extrastriatal-dopamine-d2-3-receptor-availability-in-patients-with-schizophrenia-a-high-resolution-pet-study-with-18-f-fallypride
#10
Yo-Han Joo, Jeong-Hee Kim, Young-Don Son, Hang-Keun Kim, Yeon-Jeong Shin, Sang-Yoon Lee, Jong-Hoon Kim
The purpose of this study was to investigate the relationship between specific symptom severity and D2/3 receptor availability in extrastriatal regions in outpatients with schizophrenia to shed light on the role of extrastriatal dopaminergic neurotransmission in the pathophysiology of symptoms of schizophrenia. Sixteen schizophrenia patients receiving relatively low-dose maintenance atypical antipsychotics and seventeen healthy controls underwent 3-Tesla magnetic resonance imaging and high-resolution positron emission tomography with [(18)F]fallypride...
June 16, 2017: European Archives of Psychiatry and Clinical Neuroscience
https://www.readbyqxmd.com/read/28623133/prostaglandin-d2-enhances-lipid-accumulation-through-suppression-of-lipolysis-via-dp2-crth2-receptors-in-adipocytes
#11
Eri Wakai, Kosuke Aritake, Yoshihiro Urade, Ko Fujimori
Prostaglandin (PG) D2 enhanced lipid accumulation in adipocytes. However, its molecular mechanismremains unclear. In this study, we investigated the regulatory mechanisms of PGD2-elevated lipid accumulation in mouse adipocytic 3T3-L1 cells. The Gi-coupled DP2 (CRTH2) receptors (DP2R), one of the two-types of PGD2 receptors were dominantly expressed in adipocytes. A DP2R antagonist, CAY10595, but not DP1 receptor antagonist, BWA868C cleared the PGD2-elevated intracellular triglyceride level. While, a DP2R agonist, 15R-15-methyl PGD2 (15R) increased the mRNA levels of the adipogenic and lipogenic genes, and decreased the glycerol release level...
June 13, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28619471/oral-haloperidol-or-olanzapine-intake-produces-distinct-and-region-specific-increase-in-cannabinoid-receptor-levels-that-is-prevented-by-high-fat-diet
#12
Foteini Delis, Lauren Rosko, Aditya Schroff, Kenneth E Leonard, Panayotis K Thanos
Clinical studies show higher levels of cannabinoid CB1 receptors (CB1R) in the brain of schizophrenic patients while preclinical studies report a significant functional interaction between dopamine D2 receptors and CB1Rs as well as an upregulation of CB1Rs after antipsychotic treatment. These findings prompted us to study the effects of chronic oral intake of a first and a second generation antipsychotic, haloperidol and olanzapine, on the levels and distribution of CB1Rs in the rat brain. Rats consumed either regular chow or high-fat food and drank water, haloperidol drinking solution (1...
June 12, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28615773/cabergoline-induced-mania-in-a-patient-of-pituitary-microadenoma
#13
Satyakam Mohapatra, Mihir Ranjan Nayak
Cabergoline, a dopamine agonist agent, is commonly used in the treatment of hyperprolactinemia, Parkinson's disease, restless leg syndrome, and antipsychotic-induced prolactin elevation. It is generally well tolerated as compared to other dopamine agonist agents due to its more selective D2 receptor agonistic effect. We present a case of a 25-year-old female who developed manic episode, following the use of cabergoline for treatment of pituitary microadenoma. We suggest that physicians should carefully screen patients before initiating cabergoline therapy and at-risk patients may benefit from more frequent monitoring and cessation of therapy at the earliest safe juncture...
May 2017: Indian Journal of Psychological Medicine
https://www.readbyqxmd.com/read/28612233/targeting-the-pgd2-crth2-dp1-signaling-pathway-in-asthma-and-allergic-disease-current-status-and-future-perspectives
#14
Maciej Kupczyk, Piotr Kuna
Prostaglandin D2 (PGD2) released by degranulating mast cells is believed to play a key role in orchestrating mechanisms of inflammation in allergies and asthma. The biological effects of PGD2 are mediated by D-prostanoid (DP1), CRTH2 (DP2), and thromboxane prostanoid (TP) receptors. The CRTH2 receptor is involved in induction of migration and activation of T helper type 2 (Th2) lymphocytes, eosinophils, and basophils; up-regulation of adhesion molecules; and promotion of pro-inflammatory Th2-type cytokines (interleukin [IL]-4, 5, 13), whereas the DP receptor is associated with relaxation of smooth muscles, vasodilation, inhibition of cell migration, and apoptosis of eosinophils...
June 13, 2017: Drugs
https://www.readbyqxmd.com/read/28608008/effects-of-social-reorganization-on-dopamine-d2-d3-receptor-availability-and-cocaine-self-administration-in-male-cynomolgus-monkeys
#15
P W Czoty, R W Gould, H D Gage, M A Nader
RATIONALE: Studies have demonstrated that brain dopamine D2/D3 receptors (D2/D3R) and the reinforcing effects of cocaine can be influenced by a monkey's position in the social dominance hierarchy. OBJECTIVE: In this study, we manipulated the social ranks of monkeys by reorganizing social groups and assessed effects on D2/D3R availability and cocaine self-administration. METHODS: Male cynomolgus monkeys (N = 12) had been trained to self-administer cocaine under a concurrent cocaine-food reinforcement schedule...
June 12, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28607030/mirna-340-inhibits-osteoclast-differentiation-via-repression-of-mitf
#16
Hongying Zhao, Jun Zhang, Haiyu Shao, Jianwen Liu, Mengran Jin, Jinping Chen, Yazeng Huang
Many miRNAs play critical roles in modulating various biological processes of osteoclast differentiation and function. Microphthalmia-associated transcription factor (MITF), a target of miR-340, served as pivotal transcription factor involved in osteoclast differentiation. However, the role of miR-340 and MITF during osteoclast differentiation has not yet been clearly established. Tartrate-resistant acid phosphatase (TRAP) staining assay was performed to identify osteoclasts differentiated from bone marrow-derived macrophages (BMMs)...
June 12, 2017: Bioscience Reports
https://www.readbyqxmd.com/read/28602634/dp1-receptor-agonist-bw245c-inhibits-diet-induced-obesity-in-apoe-mice
#17
Sunil Kumar, Thomas Palaia, Christopher Hall, Louis Ragolia
BACKGROUND/OBJECTIVE: Lipocalin Prostaglandin D2 synthase (LPGDS) contributes to the production of PGD2, which has been associated with adipogenesis. In this study, we aimed to investigate the role of PGD2 on obesity through its DP1 and DP2 receptor signaling using intraperitoneal injection of their respective agonists and antagonists. METHODS: ApoE(-/-) mice were divided into five groups: vehicle control (n=5), DP1 receptor agonist (n=5), DP1 receptor antagonist (n=5), DP2 receptor agonist (n=5), and DP2 receptor antagonist (n=5), and the study was carried out for 10 weeks...
June 8, 2017: Obesity Research & Clinical Practice
https://www.readbyqxmd.com/read/28602573/dopamine-signaling-and-myopia-development-what-are-the-key-challenges
#18
REVIEW
Xiangtian Zhou, Machelle T Pardue, P Michael Iuvone, Jia Qu
In the face of an "epidemic" increase in myopia over the last decades and myopia prevalence predicted to reach 2.5 billion people by the end of this decade, there is an urgent need to develop effective and safe therapeutic interventions to slow down this "myopia booming" and prevent myopia-related complications and vision loss. Dopamine (DA) is an important neurotransmitter in the retina and mediates diverse functions including development, visual signaling, and refractive development. Inspired by the convergence of epidemiological and animal studies in support of the inverse relationship between outdoor activity and risk of developing myopia and by the close biological relationship between light exposure and dopamine release/signaling, we felt it is timely and important to critically review the role of DA in myopia development...
June 7, 2017: Progress in Retinal and Eye Research
https://www.readbyqxmd.com/read/28600746/dopamine-induces-inhibitory-effects-on-the-circular-muscle-contractility-of-mouse-distal-colon-via-d1-and-d2-like-receptors
#19
Michelangelo Auteri, Maria Grazia Zizzo, Antonella Amato, Rosa Serio
Dopamine (DA) acts as gut motility modulator, via D1- and D2-like receptors, but its effective role is far from being clear. Since alterations of the dopaminergic system could lead to gastrointestinal dysfunctions, a characterization of the enteric dopaminergic system is mandatory. In this study, we investigated the role of DA and D1- and D2-like receptors in the contractility of the circular muscle of mouse distal colon by organ-bath technique. DA caused relaxation in carbachol-precontracted circular muscle strips, sensitive to domperidone, D2-like receptor antagonist, and mimicked by bromocriptine, D2-like receptor agonist...
June 9, 2017: Journal of Physiology and Biochemistry
https://www.readbyqxmd.com/read/28599217/reduced-dopamine-receptors-and-transporters-but-not-synthesis-capacity-in-normal-aging-adults-a-meta-analysis
#20
Teresa M Karrer, Anika K Josef, Rui Mata, Evan D Morris, Gregory R Samanez-Larkin
Many theories of cognitive aging are based on evidence that dopamine (DA) declines with age. Here, we performed a systematic meta-analysis of cross-sectional positron emission tomography and single-photon emission-computed tomography studies on the average effects of age on distinct DA targets (receptors, transporters, or relevant enzymes) in healthy adults (N = 95 studies including 2611 participants). Results revealed significant moderate to large, negative effects of age on DA transporters and receptors...
May 12, 2017: Neurobiology of Aging
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