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https://www.readbyqxmd.com/read/28934250/changes-in-striatal-activity-and-functional-connectivity-in-a-mouse-model-of-huntington-s-disease
#1
Magali Cabanas, Fares Bassil, Nicole Mons, Maurice Garret, Yoon H Cho
Hereditary Huntington's disease (HD) is associated with progressive motor, cognitive and psychiatric symptoms. A primary consequence of the HD mutation is the preferential loss of medium spiny projection cells with relative sparing of local interneurons in the striatum. In addition, among GABAergic striatal projection cells, indirect pathway cells expressing D2 dopamine receptors are lost earlier than direct pathway cells expressing D1 receptors. To test in vivo the functional integrity of direct and indirect pathways as well as interneurons in the striatum of male R6/1 transgenic mice, we assessed their c-Fos expression levels induced by a striatal-dependent cognitive task and compared them with age-matched wild-type littermates...
2017: PloS One
https://www.readbyqxmd.com/read/28930069/initial-elevations-in-glutamate-and-dopamine-neurotransmission-decline-with-age-as-does-exploratory-behavior-in-lrrk2-g2019s-knock-in-mice
#2
Mattia Volta, Dayne A Beccano-Kelly, Sarah A Paschall, Stefano Cataldi, Sarah E MacIsaac, Naila Kuhlmann, Chelsie A Kadgien, Igor Tatarnikov, Jesse Fox, Jaskaran Khinda, Emma Mitchell, Sabrina Bergeron, Heather Melrose, Matthew J Farrer, Austen J Milnerwood
LRRK2 mutations produce end-stage Parkinson's disease (PD) with reduced nigrostriatal dopamine. Conversely, asymptomatic carriers have increased dopamine turnover and altered brain connectivity. LRRK2 pathophysiology remains unclear, but reduced dopamine and mitochondrial abnormalities occur in aged mutant knock-in (GKI) mice. Conversely, cultured GKI neurons exhibit increased synaptic transmission. We assessed behavior and synaptic glutamate and dopamine function across ages. Young GKI exhibit more vertical exploration, elevated glutamate and dopamine transmission, and aberrant D2-receptor responses...
September 20, 2017: ELife
https://www.readbyqxmd.com/read/28929131/spontaneous-eye-blink-rate-ebr-is-uncorrelated-with-dopamine-d2-receptor-availability-and-unmodulated-by-dopamine-agonism-in-healthy-adults
#3
Linh C Dang, Gregory R Samanez-Larkin, Jaime J Castrellon, Scott F Perkins, Ronald L Cowan, Paul A Newhouse, David H Zald
Spontaneous eye blink rate (EBR) has been proposed as a noninvasive, inexpensive marker of dopamine functioning. Support for a relation between EBR and dopamine function comes from observations that EBR is altered in populations with dopamine dysfunction and EBR changes under a dopaminergic manipulation. However, the evidence across the literature is inconsistent and incomplete. A direct correlation between EBR and dopamine function has so far been observed only in nonhuman animals. Given significant interest in using EBR as a proxy for dopamine function, this study aimed to verify a direct association in healthy, human adults...
September 2017: ENeuro
https://www.readbyqxmd.com/read/28927482/treating-depressive-episodes-or-symptoms-in-patients-with-schizophrenia
#4
Geeske van Rooijen, Jentien Marloes Vermeulen, Henricus Gerardus Ruhé, Lieuwe de Haan
Depressive episodes or symptoms occur frequently in patients with schizophrenia and may have far-reaching consequences. Despite the high prevalence rate and clinical relevance of this comorbidity, knowledge about treatment options is still limited. The aim of this review is to provide an overview of the literature concerning treatment options for depressive episodes or symptoms in schizophrenia. Based on the current evidence, we present a stepwise treatment approach. The first step is to evaluate the current antipsychotic treatment of psychotic symptoms and consider lowering the dosage, since increased blockade of the dopamine D2 receptors may be associated with a worse subjective sense of well-being and dysphoria...
September 20, 2017: CNS Spectrums
https://www.readbyqxmd.com/read/28926871/multiple-organic-cation-transporters-contribute-to-the-renal-transport-of-sulpiride
#5
Liping Li, Yayun Weng, Wei Wang, Mengru Bai, Hongmei Lei, Hui Zhou, Huidi Jiang
Sulpiride, a selective dopamine D2 receptor blocker, is widely used for treatment of schizophrenia, depression, and gastric/duodenal ulcers. Because of the great majority of sulpiride in positive charged at physiological pH7.4, and ~70% of dose recovered in urine in unchanged form after human intravenous administration of sulpiride, we believe transporters play an important role in renal excretion of sulpiride. The aim of the present study was to explore which transporters contribute to the renal disposition of sulpiride...
September 19, 2017: Biopharmaceutics & Drug Disposition
https://www.readbyqxmd.com/read/28925317/dopamine-supersensitivity-psychosis-in-schizophrenia-concepts-and-implications-in-clinical-practice
#6
Yusuke Nakata, Nobuhisa Kanahara, Masaomi Iyo
Dopamine supersensitivity psychosis (DSP) is observed in patients with schizophrenia under antipsychotic treatment, and it is characterized by rebound psychosis, an uncontrollable psychotic episode following a stable state and tardive dyskinesia. DSP, first described in patients taking typical antipsychotics in the late 1970s, sometimes appears even in patients who are treated with current atypical antipsychotics. It was recently demonstrated that DSP can have a negative impact on the long-term prognosis of schizophrenia patients and that DSP could be involved in the etiology of some cases of treatment-resistant schizophrenia...
September 1, 2017: Journal of Psychopharmacology
https://www.readbyqxmd.com/read/28923416/cocaine-modulates-allosteric-d2-%C3%AF-1-receptor-receptor-interactions-on-dopamine-and-glutamate-nerve-terminals-from-rat-striatum
#7
Sarah Beggiato, Andrea Celeste Borelli, Dasiel Borroto-Escuela, Ilaria Corbucci, Maria Cristina Tomasini, Matteo Marti, Tiziana Antonelli, Sergio Tanganelli, Kjell Fuxe, Luca Ferraro
The effects of nanomolar cocaine concentrations, possibly not blocking the dopamine transporter activity, on striatal D2-σ1 heteroreceptor complexes and their inhibitory signaling over Gi/o, have been tested in rat striatal synaptosomes and HEK293T cells. Furthermore, the possible role of σ1 receptors (σ1Rs) in the cocaine-provoked amplification of D2 receptor (D2R)-induced reduction of K(+)-evoked [(3)H]-DA and glutamate release from rat striatal synaptosomes, has also been investigated. The dopamine D2-likeR agonist quinpirole (10nM-1μM), concentration-dependently reduced K(+)-evoked [(3)H]-DA and glutamate release from rat striatal synaptosomes...
September 15, 2017: Cellular Signalling
https://www.readbyqxmd.com/read/28921719/inflammation-alters-ampa-stimulated-calcium-responses-in-dorsal-striatal-d2-but-not-d1-spiny-projection-neurons
#8
Carissa D Winland, Nora Welsh, Alberto Sepulveda-Rodriguez, Stefano Vicini, Kathleen A Maguire-Zeiss
Neuroinflammation precedes neuronal loss in striatal neurodegenerative diseases and can be exacerbated by the release of proinflammatory molecules by microglia. These molecules can affect trafficking of AMPARs. The preferential trafficking of calcium-permeable versus impermeable AMPARs can result in disruptions of [Ca(2+) ]i and alter cellular functions. In striatal neurodegenerative diseases, changes in [Ca(2+) ]i and L-type voltage-gated calcium channels (VGCCs) have been reported. Therefore, the present study sought to determine whether a proinflammatory environment alters AMPA-stimulated [Ca(2+) ]i through calcium-permeable AMPARs and/or L-type VGCCs in dopamine-2 and dopamine-1 expressing striatal spiny projection neurons (D2 and D1 SPNs) in the dorsal striatum...
September 16, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28921163/discriminative-stimulus-properties-of-the-atypical-antipsychotic-amisulpride-comparison-to-its-isomers-and-to-other-benzamide-derivatives-antipsychotic-antidepressant-and-antianxiety-drugs-in-c57bl-6-mice
#9
Timothy J Donahue, Todd M Hillhouse, Kevin A Webster, Richard Young, Eliseu O De Oliveira, Joseph H Porter
RATIONALE: Racemic (RS)-amisulpride (Solian(®)) is an atypical antipsychotic drug used to treat schizophrenia and dysthymia. Blockade of dopamine D2/D3 and/or serotonin 5-HT7 receptors is implicated in its pharmacological effects. While the (S)-amisulpride isomer possesses a robust discriminative cue, discriminative stimulus properties of (RS)-amisulpride have not been evaluated. OBJECTIVES: The present study established (RS)-amisulpride as a discriminative stimulus and assessed amisulpride-like effects of amisulpride stereoisomers, other benzamide derivatives, and antipsychotic, antidepressant, and anxiolytic drugs...
September 18, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28916137/oxytocin-induces-penile-erection-and-yawning-when-injected-into-the-bed-nucleus-of-the-stria-terminalis-involvement-of-glutamic-acid-dopamine-and-nitric-oxide
#10
Fabrizio Sanna, Jessica Bratzu, Antonio Argiolas, Maria Rosaria Melis
Oxytocin (5-100ng), but not Arg(8)-vasopressin (100ng), injected unilaterally into the bed nucleus of the stria terminalis (BNST) induces penile erection and yawning in a dose-dependent manner in male rats. The minimal effective dose was 20ng for penile erection and 5ng for yawning. Oxytocin responses were abolished not only by the oxytocin receptor antagonist d(CH2)5Tyr(Me)(2)-Orn(8)-vasotocin (1μg), but also by (+) MK-801 (1μg), an excitatory amino acid receptor antagonist of the N-methyl-d-aspartic acid (NMDA) subtype, SCH 23390 (1μg), a D1 receptor antagonist, but not haloperidol (1μg), a D2 receptor antagonist, and SMTC (40μg), an inhibitor of neuronal nitric oxide synthase, injected into the BNST 15min before oxytocin...
September 18, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28912680/fyn-signaling-is-compartmentalized-to-dopamine-d1-receptor-expressing-neurons-in-the-dorsal-medial-striatum
#11
Khanhky Phamluong, Emmanuel Darcq, Su Wu, Samuel A Sakhai, Dorit Ron
The tyrosine kinase Fyn plays an important role in synaptic plasticity, learning, and memory. Here we report that Fyn is activated in response to 15 min D1 receptor (D1R) but not D2 receptor (D2R) stimulation specifically in the dorsomedial striatum (DMS) of mice but not in the other substriatal regions, the dorsolateral striatum (DLS), and the nucleus accumbens (NAc). Once activated Fyn phosphorylates its substrate GluN2B, and we show that GluN2B is phosphorylated only in the DMS but not in the other striatal regions...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28912499/role-of-dopamine-d2-receptor-in-stress-induced-myelin-loss
#12
Mi-Hyun Choi, Ji Eun Na, Ye Ran Yoon, Hyo Jin Lee, Sehyoun Yoon, Im Joo Rhyu, Ja-Hyun Baik
Dopaminergic systems play a major role in reward-related behavior and dysregulation of dopamine (DA) systems can cause several mental disorders, including depression. We previously reported that dopamine D2 receptor knockout (D2R(-/-)) mice display increased anxiety and depression-like behaviors upon chronic stress. Here, we observed that chronic stress caused myelin loss in wild-type (WT) mice, while the myelin level in D2R(-/-) mice, which was already lower than that in WT mice, was not affected upon stress...
September 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28912160/dopamine-d2-receptors-modulate-pyramidal-neurons-in-mouse-medial-prefrontal-cortex-through-a-stimulatory-g-protein-pathway
#13
Sarah E Robinson, Vikaas S Sohal
Dopaminergic modulation of prefrontal cortex is believed to play key roles in many cognitive functions and to be disrupted in pathological conditions such as schizophrenia. We have previously described a phenomenon whereby dopamine D2 receptor (D2R) activation elicits afterdepolarizations (ADPs) in subcortically-projecting (SC) pyramidal neurons within L5 of the prefrontal cortex. These D2R-induced ADPs only occur following synaptic input which activates NMDA receptors (NMDARs) even when the delay between the synaptic input and afterdepolarizations is relatively long, e...
September 14, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28910740/generation-of-low-gamma-oscillations-in-a-gabaergic-network-model-of-the-striatum
#14
Zhihua Wu, Aike Guo, Xiaodi Fu
Striatal oscillations in the low-gamma frequency range have been consistently recorded in a number of experimental studies. However, whether these rhythms are locally generated in the striatum circuit, which is mainly composed of GABAergic neurons, remains an open question. GABAergic medium spiny projection neurons represent the great majority of striatal neurons, but they fire at very low rates. GABAergic fast-spiking interneurons typically show firing rates that are approximately 10 times higher than those of principal neurons, but they are a very small minority of the total neuronal population...
September 11, 2017: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/28905269/differences-in-neural-response-to-romantic-stimuli-in-monogamous-and-non-monogamous-men
#15
Lisa Dawn Hamilton, Cindy M Meston
In non-human animal research, studies comparing socially monogamous and promiscuous species of voles (Microtus) have identified some key neural differences related to monogamy and non-monogamy. Specifically, densities of the vasopressin V1a receptor and dopamine D2 receptors in subcortical reward-related and limbic areas of the brain have been linked to monogamous behavior in prairie voles (Microtus ochrogaster). Similar brain areas have been shown to be correlated with feelings of romantic love in monogamously pair-bonded humans...
September 13, 2017: Archives of Sexual Behavior
https://www.readbyqxmd.com/read/28895569/the-effects-of-the-monoamine-stabilizer-osu6162-on-binge-like-eating-and-cue-controlled-food-seeking-behavior-in-rats
#16
K Feltmann, C Giuliano, B J Everitt, P Steensland, J Alsiö
Binge eating disorder (BED) is characterized by recurring episodes of excessive consumption of palatable food and an increased sensitivity to food cues. Patients with BED display an addiction-like symptomatology and the dopamine system might be a potential treatment target. The clinically safe monoamine stabilizer (-)-OSU6162 (OSU6162) restores dopaminergic dysfunction in long-term alcohol drinking rats and shows promise as a novel treatment for alcohol use disorder. Here, the effects of OSU6162 on consummatory (binge-like eating) and appetitive (cue-controlled seeking) behavior motivated by chocolate-flavored sucrose pellets were evaluated in non-food-restricted male Lister Hooded rats...
September 12, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28894586/a-pilot-study-on-the-impact-of-dopamine-serotonin-and-brain-derived-neurotrophic-factor-genotype-on-long-term-functional-outcomes-after-subarachnoid-hemorrhage
#17
Ansley Stanfill, Claire Simpson, Paula Sherwood, Samuel Poloyac, Elizabeth Crago, Hyungsuk Kim, Yvette Conley
OBJECTIVES: Many that survive an aneurysmal subarachnoid hemorrhage experience lasting physical disability, which might be improved by medications with effects on the dopaminergic, serotonergic, and brain-derived neurotrophic factor neurotransmitter systems. But it is not clear which patients are most likely to benefit from these therapies. The purpose of this pilot study was to explore the relationship of genetic polymorphisms in these pathways with 12-month functional outcomes after aneurysmal subarachnoid hemorrhage...
2017: SAGE Open Medicine
https://www.readbyqxmd.com/read/28894300/striatal-dopamine-d1-type-receptor-availability-no-difference-from-control-but-association-with-cortical-thickness-in-methamphetamine-users
#18
K Okita, A M Morales, A C Dean, M C Johnson, V Lu, J Farahi, M A Mandelkern, E D London
Chronic methamphetamine use poses potentially devastating consequences for directly affected individuals and for society. Lower dopamine D2-type receptor availability has been observed in striata of methamphetamine users as compared with controls, but an analogous comparison of D1-type receptors has been conducted only on post-mortem material, with no differences in methamphetamine users from controls in the caudate nucleus and putamen and higher D1-receptor density in the nucleus accumbens. Released from neurons when methamphetamine is self-administered, dopamine binds to both D1- and D2-type receptors in the striatum, with downstream effects on cortical activity...
September 12, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28893593/monoaminergic-neurotransmission-is-mediating-the-antidepressant-like-effects-of-passiflora-edulis-sims-fo-edulis
#19
Adriana S F S J Ayres, Wilton B Santos, Décio D Junqueira-Ayres, Geison M Costa, Freddy A Ramos, Leonardo Castellanos, Jovelina S F Alves, Laila Asth, Iris U de Medeiros, Silvana M Zucolotto, Elaine C Gavioli
The genus Passiflora is popularly used to treat anxiety. Recent studies showed antidepressant-like effects of two varieties of P. edulis (edulis and flavicarpa) in mice. However, the mechanisms of antidepressant actions are still unknown. Here, the effects of P. edulis fo. edulis aqueous extract (AE, 100-300mg/kg, po), and ethyl acetate (AcOEt, 25-50mg/kg, po), butanol (BuOH, 25-50mg/kg, po) and residual aqueous (25-100mg/kg, po) fractions were investigated in the mouse forced swimming test. In addition, the involvement of monoamines in the P...
September 8, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28892416/roman-high-and-low-avoidance-rats-differ-in-their-response-to-chronic-olanzapine-treatment-at-the-level-of-body-weight-regulation-glucose-homeostasis-and-cortico-mesolimbic-gene-expression
#20
Simon S Evers, Gretha J Boersma, Kellie Lk Tamashiro, Anton Jw Scheurink, Gertjan van Dijk
Olanzapine, an antipsychotic agent mainly used for treating schizophrenia, is frequently associated with body weight gain and diabetes mellitus. Nonetheless, studies have shown that not every individual is equally susceptible to olanzapine's weight-gaining effect. Therefore, Roman high and low avoidance rat strains were examined on their responsiveness to olanzapine treatment. The Roman high avoidance rat shares many behavioral and physiological characteristics with human schizophrenia, such as increased central dopaminergic sensitivity, whereas the Roman low avoidance rat has been shown to be prone to diet-induced obesity and insulin resistance...
August 1, 2017: Journal of Psychopharmacology
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