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Dopamine Cannabinoids

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https://www.readbyqxmd.com/read/29740319/pharmacological-blockade-of-adenosine-a-2a-but-not-a-1-receptors-enhances-goal-directed-valuation-in-satiety-based-instrumental-behavior
#1
Yan Li, Xinran Pan, Yan He, Yang Ruan, Linshan Huang, Yuling Zhou, Zhidong Hou, Chaoxiang He, Zhe Wang, Xiong Zhang, Jiang-Fan Chen
The balance and smooth shift between flexible, goal-directed behaviors and repetitive, habitual actions are critical to optimal performance of behavioral tasks. The striatum plays an essential role in control of goal-directed versus habitual behaviors through a rich interplay of the numerous neurotransmitters and neuromodulators to modify the input, processing and output functions of the striatum. The adenosine receptors (namely A2A R and A1 R), with their high expression pattern in the striatum and abilities to interact and integrate dopamine, glutamate and cannabinoid signals in the striatum, may represent novel therapeutic targets for modulating instrumental behavior...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29740277/hedonic-eating-and-the-delicious-circle-from-lipid-derived-mediators-to-brain-dopamine-and-back
#2
REVIEW
Roberto Coccurello, Mauro Maccarrone
Palatable food can be seductive and hedonic eating can become irresistible beyond hunger and negative consequences. This is witnessed by the subtle equilibrium between eating to provide energy intake for homeostatic functions, and reward-induced overeating. In recent years, considerable efforts have been devoted to study neural circuits, and to identify potential factors responsible for the derangement of homeostatic eating toward hedonic eating and addiction-like feeding behavior. Here, we examined recent literature on "old" and "new" players accountable for reward-induced overeating and possible liability to eating addiction...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29560069/cannabinoid-hyperemesis-syndrome-public-health-implications-and-a-novel-model-treatment-guideline
#3
Jeff Lapoint, Seth Meyer, Charles K Yu, Kristi L Koenig, Roneet Lev, Sayone Thihalolipavan, Katherine Staats, Christopher A Kahn
Introduction: Cannabinoid hyperemesis syndrome (CHS) is an entity associated with cannabinoid overuse. CHS typically presents with cyclical vomiting, diffuse abdominal pain, and relief with hot showers. Patients often present to the emergency department (ED) repeatedly and undergo extensive evaluations including laboratory examination, advanced imaging, and in some cases unnecessary procedures. They are exposed to an array of pharmacologic interventions including opioids that not only lack evidence, but may also be harmful...
March 2018: Western Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29487381/mglur5-antagonism-inhibits-cocaine-reinforcement-and-relapse-by-elevation-of-extracellular-glutamate-in-the-nucleus-accumbens-via-a-cb1-receptor-mechanism
#4
Xia Li, Xiao-Qing Peng, Chloe J Jordan, Jie Li, Guo-Hua Bi, Yi He, Hong-Ju Yang, Hai-Ying Zhang, Eliot L Gardner, Zheng-Xiong Xi
Metabotropic glutamate receptor 5 (mGluR5) antagonism inhibits cocaine self-administration and reinstatement of drug-seeking behavior. However, the cellular and molecular mechanisms underlying this action are poorly understood. Here we report a presynaptic glutamate/cannabinoid mechanism that may underlie this action. Systemic or intra-nucleus accumbens (NAc) administration of the mGluR5 antagonist 2-methyl-6-(phenylethynyl)-pyridine (MPEP) dose-dependently reduced cocaine (and sucrose) self-administration and cocaine-induced reinstatement of drug-seeking behavior...
February 27, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29466446/the-cannabinoid-1-receptor-is-abundantly-expressed-in-striatal-striosomes-and-striosome-dendron-bouquets-of-the-substantia-nigra
#5
Margaret I Davis, Jill R Crittenden, Austin Y Feng, David A Kupferschmidt, Alipi Naydenov, Nephi Stella, Ann M Graybiel, David M Lovinger
Presynaptic cannabinoid-1 receptors (CB1-R) bind endogenous and exogenous cannabinoids to modulate neurotransmitter release. CB1-Rs are expressed throughout the basal ganglia, including striatum and substantia nigra, where they play a role in learning and control of motivated actions. However, the pattern of CB1-R expression across different striatal compartments, microcircuits and efferent targets, and the contribution of different CB1-R-expressing neurons to this pattern, are unclear. We use a combination of conventional techniques and novel genetic models to evaluate CB1-R expression in striosome (patch) and matrix compartments of the striatum, and in nigral targets of striatal medium spiny projection neurons (MSNs)...
2018: PloS One
https://www.readbyqxmd.com/read/29437028/changes-in-the-peripheral-endocannabinoid-system-as-a-risk-factor-for-the-development-of-eating-disorders
#6
Anna Capasso, Walter Milano, Omar Cauli
BACKGROUND AND OBJECTIVE: Eating Disorder (ED) is characterized by persistently and severely disturbed eating behaviours. They arise from a combination of long-standing behavioural, emotional, psychological, interpersonal, and social factors and result in insufficient nutrient ingestion and/or adsorption. The three main EDs are: anorexia nervosa, bulimia nervosa, and binge eating disorder. We review the role of peripheral endocannabinoids in eating behaviour. DISCUSSION: The neuronal pathways involved in feeding behaviours are closely related to catecholaminergic, serotoninergic and peptidergic systems...
February 12, 2018: Endocrine, Metabolic & Immune Disorders Drug Targets
https://www.readbyqxmd.com/read/29407764/rimonabant-a-potent-cb1-cannabinoid-receptor-antagonist-is-a-g%C3%AE-i-o-protein-inhibitor
#7
Alessandra Porcu, Miriam Melis, Rostislav Turecek, Celine Ullrich, Ignazia Mocci, Bernhard Bettler, Gian Luigi Gessa, M Paola Castelli
Rimonabant is a potent and selective cannabinoid CB1 receptor antagonist widely used in animal and clinical studies. Besides its antagonistic properties, numerous studies have shown that, at micromolar concentrations rimonabant behaves as an inverse agonist at CB1 receptors. The mechanism underpinning this activity is unclear. Here we show that micromolar concentrations of rimonabant inhibited Gαi/o -type G proteins, resulting in a receptor-independent block of G protein signaling. Accordingly, rimonabant decreased basal and agonist stimulated [35 S]GTPγS binding to cortical membranes of CB1- and GABAB -receptor KO mice and Chinese Hamster Ovary (CHO) cell membranes stably transfected with GABAB or D2 dopamine receptors...
May 1, 2018: Neuropharmacology
https://www.readbyqxmd.com/read/29385930/pro-psychotic-effects-of-synthetic-cannabinoids-interactions-with-central-dopamine-serotonin-and-glutamate-systems
#8
William E Fantegrossi, Catheryn D Wilson, Michael D Berquist
An association between marijuana use and schizophrenia has been noted for decades, and the recent emergence of high-efficacy synthetic cannabinoids (SCBs) as drugs of abuse has lead to a growing number of clinical reports of persistent psychotic effects in users of these substances. The mechanisms underlying SCB-elicited pro-psychotic effects is unknown, but given the ubiquitous neuromodulatory functions of the endocannabinoid system, it seems likely that agonist actions at cannabinoid type-1 receptors (CB1Rs) might modulate the functions of other neurotransmitter systems known to be involved in schizophrenia...
February 2018: Drug Metabolism Reviews
https://www.readbyqxmd.com/read/29329382/adolescent-synthetic-cannabinoid-exposure-produces-enduring-changes-in-dopamine-neuron-activity-in-a-rodent-model-of-schizophrenia-susceptibility
#9
David D Aguilar, Andrea Giuffrida, Daniel J Lodge
Background: Epidemiological studies recognize cannabis intake as a risk factor for schizophrenia, yet the majority of adolescents who use marijuana do not develop psychosis. Similarly, the abuse of synthetic cannabinoids poses a risk for psychosis. For these reasons, it is imperative to understand the effects of adolescent cannabinoid exposure in susceptible individuals. Methods: We recently developed a novel rodent model of schizophrenia susceptibility, the F2 methylazoxymethanol acetate rat, where only a proportion (~40%) of rats display a schizophrenia-like phenotype...
April 1, 2018: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29249810/schizophrenia-and-depression-two-poles-of-endocannabinoid-system-deregulation
#10
María Rodríguez-Muñoz, Pilar Sánchez-Blázquez, Luis F Callado, J Javier Meana, Javier Garzón-Niño
The activity of certain G protein-coupled receptors (GPCRs) and of glutamate N-Methyl-D-aspartate receptors (NMDARs) is altered in both schizophrenia and depression. Using postmortem prefrontal cortex samples from subjects with schizophrenia or depression, we observed a series of opposite changes in the expression of signaling proteins that have been implicated in the cross-talk between GPCRs and NMDARs. Thus, the levels of HINT1 proteins and NMDAR NR1 subunits carrying the C1 cytosolic segment were increased in depressives and decreased in schizophrenics, respect to matched controls...
December 18, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/29234141/cannabinoid-type-2-receptors-in-dopamine-neurons-inhibits-psychomotor-behaviors-alters-anxiety-depression-and-alcohol-preference
#11
Qing-Rong Liu, Ana Canseco-Alba, Hai-Ying Zhang, Patricia Tagliaferro, Monika Chung, Eugene Dennis, Branden Sanabria, Norman Schanz, Joao Carlos Escosteguy-Neto, Hiroki Ishiguro, Zhicheng Lin, Susan Sgro, Claire M Leonard, Jair Guilherme Santos-Junior, Eliot L Gardner, Josephine M Egan, Jeung Woon Lee, Zheng-Xiong Xi, Emmanuel S Onaivi
Cannabinoid CB2 receptors (CB2Rs) are expressed in mouse brain dopamine (DA) neurons and are involved in several DA-related disorders. However, the cell type-specific mechanisms are unclear since the CB2R gene knockout mice are constitutive gene knockout. Therefore, we generated Cnr2-floxed mice that were crossed with DAT-Cre mice, in which Cre- recombinase expression is under dopamine transporter gene (DAT) promoter control to ablate Cnr2 gene in midbrain DA neurons of DAT-Cnr2 conditional knockout (cKO) mice...
December 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29223163/neuroprotective-properties-of-endocannabinoids-n-arachidonoyl-dopamine-and-n-docosahexaenoyl-dopamine-examined-in-neuronal-precursors-derived-from-human-pluripotent-stem-cells
#12
E V Novosadova, E L Arsenyeva, E S Manuilova, L G Khaspekov, M Yu Bobrov, V V Bezuglov, S N Illarioshkin, I A Grivennikov
Neuroprotective properties of endocannabinoids N-arachidonoyl dopamine (NADA) and N-docosahexaenoyl dopamine (DHDA) were examined in neuronal precursor cells differentiated from human induced pluripotent stem cells and subjected to oxidative stress. Both compounds exerted neuroprotective activity, which was enhanced by elevating the concentration of the endocannabinoids within the 0.1-10 µM range. However, both agents at 10 µM concentration showed a marked toxic effect resulting in death of ~30% of the cells...
November 2017: Biochemistry. Biokhimii︠a︡
https://www.readbyqxmd.com/read/29221808/a-cannabinoid-receptor-antagonist-attenuates-ghrelin-induced-activation-of-the-mesolimbic-dopamine-system-in-mice
#13
Aimilia Lydia Kalafateli, Daniel Vallöf, Julia Winsa Jörnulf, Markus Heilig, Elisabet Jerlhag
Ghrelin has been attributed various physiological processes including food intake and reward regulation, through activation of the mesolimbic dopamine system. Reward modulation involves the mesolimbic dopamine system, consisting of the ventral tegmental area (VTA) dopamine neurons targeting nucleus accumbens (NAc), a system that ghrelin activates through VTA-dependent mechanisms. In the first study, we found that systemic intraperitoneal (ip) administration of rimonabant attenuated intracerebroventricular (icv) ghrelin's ability to cause locomotor stimulation and NAc dopamine release in mice...
February 1, 2018: Physiology & Behavior
https://www.readbyqxmd.com/read/29132050/cannabinoid-hyperemesis-syndrome-review-of-the-literature-and-of-cases-reported-to-the-french-addictovigilance-network
#14
REVIEW
Benoît Schreck, Nicolas Wagneur, Pascal Caillet, Marie Gérardin, Jennyfer Cholet, Michel Spadari, Nicolas Authier, Juliana Tournebize, Marion Gaillard, Anais Serre, Louise Carton, Stéphanie Pain, Pascale Jolliet, Caroline Victorri-Vigneau
BACKGROUND: Cannabinoid hyperemesis syndrome is a variant of cyclical vomiting syndrome in a context of chronic cannabis usage. Our aim was to compare French cases to those identified in the international literature in order to further our knowledge of the clinical criteria, pathophysiology and treatments for cannabinoid hyperemesis syndrome. METHODS: We analysed cases reported in the international literature up to 30 June 2017, obtained from the MEDLINE, PsycINFO and The Cochrane Library databases; we selected relevant articles based on title and abstract...
January 1, 2018: Drug and Alcohol Dependence
https://www.readbyqxmd.com/read/29128806/emotional-disorders-induced-by-hemopressin-and-rvd-hemopressin-%C3%AE-administration-in-rats
#15
Sheila Leone, Lucia Recinella, Annalisa Chiavaroli, Sara Martinotti, Claudio Ferrante, Adriano Mollica, Giorgia Macedonio, Azzurra Stefanucci, Szabolcs Dvorácskó, Csaba Tömböly, Luciano De Petrocellis, Michele Vacca, Luigi Brunetti, Giustino Orlando
BACKGROUND: The endocannabinoid (eCB) system plays an important role in regulating emotional disorders, and is involved, directly or indirectly, in psychiatric diseases, such as anxiety and depression. Hemopressin, a hemoglobin α chain-derived peptide, and RVD-hemopressin(α), a N-terminally extended form of hemopressin, act as antagonist/inverse agonist and negative allosteric modulator of the cannabinoid 1 (CB1) receptor, respectively. METHODS: Considering the possible involvement of these peptides on emotional behaviour, the aim of our study was to investigate the behavioural effects of a single intraperitoneal (ip) injection of hemopressin (0...
December 2017: Pharmacological Reports: PR
https://www.readbyqxmd.com/read/29121220/pathway-specific-control-of-striatal-neuron-vulnerability-by-corticostriatal-cannabinoid-cb1-receptors
#16
Andrea Ruiz-Calvo, Irene B Maroto, Raquel Bajo-Grañeras, Anna Chiarlone, Ángel Gaudioso, José J Ferrero, Eva Resel, José Sánchez-Prieto, José A Rodríguez-Navarro, Giovanni Marsicano, Ismael Galve-Roperh, Luigi Bellocchio, Manuel Guzmán
The vast majority of neurons within the striatum are GABAergic medium spiny neurons (MSNs), which receive glutamatergic input from the cortex and thalamus, and form two major efferent pathways: the direct pathway, expressing dopamine D1 receptor (D1R-MSNs), and the indirect pathway, expressing dopamine D2 receptor (D2R-MSNs). While molecular mechanisms of MSN degeneration have been identified in animal models of striatal damage, the molecular factors that dictate a selective vulnerability of D1R-MSNs or D2R-MSNs remain unknown...
January 1, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29113897/long-lasting-effects-of-chronic-win55-212-2-treatment-on-mesostriatal-dopaminergic-and-cannabinoid-systems-in-the-rat-brain
#17
Panagiotis Perdikaris, Martha Tsarouchi, Eleni Fanarioti, Evangelos Natsaridis, Ada Mitsacos, Panagiotis Giompres
Cannabinoid administration modulates dopamine transmission via an indirect, multisynaptic mechanism that includes the activation of cannabinoid type-1 receptor (CB1R). The present study evaluated in rodents, the effects of acute and chronic (20 days) WIN55,212-2 administration, a non-selective CB1R agonist, on dopamine uptake and synthesis in the mesolimbic and nigrostriatal dopaminergic pathways and associate them to its effects on the endocannabinoid system. The effect of spontaneous withdrawal, after different abstinence periods (7 days, 20 days), was also assessed...
February 2018: Neuropharmacology
https://www.readbyqxmd.com/read/29109060/cannabinoid-1-receptor-neutral-antagonist-reduces-binge-like-alcohol-consumption-and-alcohol-induced-accumbal-dopaminergic-signaling
#18
Andrea Balla, Bin Dong, Borehalli M Shilpa, Kiran Vemuri, Alexandros Makriyannis, Subhash C Pandey, Henry Sershen, Raymond F Suckow, K Yaragudri Vinod
Binge alcohol (ethanol) drinking is associated with profound adverse effects on our health and society. Rimonabant (SR141716A), a CB1 receptor inverse agonist, was previously shown to be effective for nicotine cessation and obesity. However, studies using rimonabant were discontinued as it was associated with an increased risk of depression and anxiety. In the present study, we examined the pharmacokinetics and effects of AM4113, a novel CB1 receptor neutral antagonist on binge-like ethanol drinking in C57BL/6J mice using a two-bottle choice drinking-in-dark (DID) paradigm...
March 15, 2018: Neuropharmacology
https://www.readbyqxmd.com/read/29098189/an-update-on-non-cb-1-non-cb-2-cannabinoid-related-g-protein-coupled-receptors
#19
REVIEW
Paula Morales, Patricia H Reggio
The endocannabinoid system (ECS) has been shown to be of great importance in the regulation of numerous physiological and pathological processes. To date, two Class A G-protein-coupled receptors (GPCRs) have been discovered and validated as the main therapeutic targets of this system: the cannabinoid receptor type 1 (CB1 ), which is the most abundant neuromodulatory receptor in the brain, and the cannabinoid receptor type 2 (CB2 ), predominantly found in the immune system among other organs and tissues. Endogenous cannabinoid receptor ligands (endocannabinoids) and the enzymes involved in their synthesis, cell uptake, and degradation have also been identified as part of the ECS...
2017: Cannabis and Cannabinoid Research
https://www.readbyqxmd.com/read/29097307/effect-fingerprinting-of-new-psychoactive-substances-nps-what-can-we-learn-from-in-vitro-data
#20
REVIEW
Laura Hondebrink, Anne Zwartsen, Remco H S Westerink
The use of new psychoactive substances (NPS) is increasing and currently >600 NPS have been reported. However, limited information on neuropharmacological and toxicological effects of NPS is available, hampering risk characterization. We reviewed the literature on the in vitro neuronal modes of action to obtain effect fingerprints of different classes of illicit drugs and NPS. The most frequently reported NPS were selected for review: cathinones (MDPV, α-PVP, mephedrone, 4-MEC, pentedrone, methylone), cannabinoids (JWH-018), (hallucinogenic) phenethylamines (4-fluoroamphetamine, benzofurans (5-APB, 6-APB), 2C-B, NBOMes (25B-NBOMe, 25C-NBOMe, 25I-NBOMe)), arylcyclohexylamines (methoxetamine) and piperazine derivatives (mCPP, TFMPP, BZP)...
February 2018: Pharmacology & Therapeutics
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