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Dopamine and motivation

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https://www.readbyqxmd.com/read/29225042/endogenous-dopamine-and-endocannabinoid-signaling-mediate-cocaine-induced-reversal-of-ampar-synaptic-potentiation-in-the-nucleus-accumbens-shell
#1
Anna E Ingebretson, Matthew C Hearing, Ethan D Huffington, Mark J Thomas
Repeated exposure to drugs of abuse alters the structure and function of neural circuits mediating reward, generating maladaptive plasticity in circuits critical for motivated behavior. Within meso-corticolimbic dopamine circuitry, repeated exposure to cocaine induces progressive alterations in AMPAR-mediated glutamatergic synaptic transmission. During a 10-14 day period of abstinence from cocaine, AMPAR signaling is potentiated at synapses on nucleus accumbens (NAc) medium spiny neurons (MSNs), promoting a state of heightened synaptic excitability...
December 7, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/29222936/role-of-central-oxytocin-and-dopamine-systems-in-nociception-and-their-possible-interactions-suggested-hypotheses
#2
Mohammed Gamal-Eltrabily, Alfredo Manzano-García
Central oxytocin and dopamine have an important role in the process of nociception at the spinal level as well as supraspinal structures, e.g. anterior cingulate cortex, insular cortex, amygdala, nucleus accumbens, and hypothalamus. Many studies have pointed out the importance of both systems in the pain descending modulatory system and in pain-related symptoms in some chronic disorders, e.g. Parkinson disease and fibromyalgia. The interaction between oxytocin and dopamine systems has been addressed in some motivational behaviors, e...
December 9, 2017: Reviews in the Neurosciences
https://www.readbyqxmd.com/read/29217687/role-of-the-axon-initial-segment-in-the-control-of-spontaneous-frequency-of-nigral-dopaminergic-neurons-in-vivo
#3
Rodrigo C Meza, Luciana López-Jury, Carmen C Canavier, Pablo Henny
The spontaneous tonic discharge activity of nigral dopamine neurons plays a fundamental role in dopaminergic signaling. To investigate the role of neuronal morphology and architecture with respect to spontaneous activity in this population, we visualized the 3D structure of the axon initial segment (AIS) along with the entire somatodendritic domain of adult male mouse dopaminergic neurons, previously recorded in vivo We observed a positive correlation of the firing rate with both proximity and size of the AIS...
December 6, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29196318/inactivation-of-nmda-receptors-in-the-ventral-tegmental-area-during-cocaine-self-administration-prevents-glua1-up-regulation-but-with-paradoxical-increases-in-cocaine-seeking-behavior
#4
Daniel Guzman, Maria B Carreira, Allyson K Friedman, Megumi Adachi, Rachael L Neve, Lisa M Monteggia, Ming-Hu Han, Christopher W Cowan, David W Self
Cocaine self-administration increases expression of GluA1 subunits in ventral tegmental area (VTA) dopamine neurons that subsequently enhance the motivation for cocaine. This increase in GluA1 may be dependent on concomitant NMDA receptor (NMDAR) activation during self-administration, similar to cocaine-induced LTP in the VTA. In this study, we used viral-mediated expression of a dominant negative GluN1 subunit (HSV-dnGluN1) in VTA neurons to study the effect of transient NMDAR inactivation on the GluA1 increases induced by chronic cocaine self-administration in male rats...
December 1, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29194534/why-not-try-harder-computational-approach-to-motivation-deficits-in-neuro-psychiatric-diseases
#5
Mathias Pessiglione, Fabien Vinckier, Sébastien Bouret, Jean Daunizeau, Raphaël Le Bouc
Motivation deficits, such as apathy, are pervasive in both neurological and psychiatric diseases. Even when they are not the core symptom, they reduce quality of life, compromise functional outcome and increase the burden for caregivers. They are currently assessed with clinical scales that do not give any mechanistic insight susceptible to guide therapeutic intervention. Here, we present another approach that consists of phenotyping the behaviour of patients in motivation tests, using computational models...
November 29, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29183706/differential-behavioral-phenotypes-of-dopamine-d1-receptor-knockdown-mice-at-the-embryonic-postnatal-and-adult-stages
#6
Tadashi Okubo, Asako Sato, Hirotsugu Okamoto, Toshiya Sato, Toshikuni Sasaoka
Dopamine is widely involved in behaviors related to motor activity, cognition, motivation, and reward. Dopamine signal is transduced through the dopamine receptor gene family. The dopamine D1 receptor (D1R) is highly expressed in the striatum, and is responsible for regulating the motor function. Recently, we have reported that the knockdown (KD) mice in which D1R was conditionally eliminated at adult stage, displayed a hypoactivity in the home cage than wild type mice; however, conventional D1R knockout (KO) mice show hyperactive phenotypes...
November 25, 2017: International Journal of Developmental Neuroscience
https://www.readbyqxmd.com/read/29182715/modulation-of-rat-50-khz-ultrasonic-vocalizations-by-glucocorticoid-signaling-possible-relevance-to-reward-and-motivation
#7
Nicola Simola, Elena Paci, Marcello Serra, Giulia Costa, Micaela Morelli
Background: Rats emit 50-kHz ultrasonic vocalizations (USVs) to communicate positive emotional states, and these USVs are increasingly being investigated in preclinical studies on reward and motivation. Although it is the activation of dopamine receptors that initiates the emission of 50-kHz USVs, non-dopaminergic mechanisms may modulate calling in the 50 kHz frequency band. To further elucidate these mechanisms, the present study investigated whether the pharmacological manipulation of glucocorticoid signaling influenced calling...
November 22, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29175958/amphetamine-reverses-escalated-cocaine-intake-via-restoration-of-dopamine-transporter-conformation
#8
Cody A Siciliano, Kaustuv Saha, Erin S Calipari, Steve C Fordahl, Rong Chen, Habibeh Khoshbouei, Sara R Jones
Cocaine abuse disrupts dopamine system function, including reduced cocaine inhibition of the dopamine transporter (DAT), which results in tolerance. Although tolerance is a hallmark of cocaine addiction and a DSM-V criteria for substance abuse disorders, the molecular adaptations producing tolerance are unknown, and testing the impact of DAT changes on drug taking behaviors has proven difficult. In regard to treatment, amphetamine has shown efficacy in reducing cocaine intake; however, the mechanisms underlying these effects have not been explored...
November 24, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29175512/altering-d1-receptor-activity-in-the-basolateral-amygdala-impairs-fear-suppression-during-a-safety-cue
#9
Ka H Ng, Michael W Pollock, Phillip J Urbanczyk, Susan Sangha
Accurate discrimination among cues signifying reward, danger or safety initiates the proper emotional response in order to guide behavior. Appropriate conditioned inhibition of fear in the presence of a safety cue would allow an organism to engage in reward seeking behaviors. There is currently little known about the mechanisms of reward, fear and safety cue discrimination and how a safety cue can inhibit fear and release reward seeking from inhibition. Here we assess reward, fear and safety cue learning together using a behavioral paradigm that has identified neurons that discriminate among these cues in the basolateral amygdala (BLA) (Sangha, Chadick, & Janak, 2013)...
November 22, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/29168271/n-methyl-d-aspartate-receptor-co-agonist-availability-affects-behavioral-and-neurochemical-responses-to-cocaine-insights-into-comorbid-schizophrenia-and-substance-abuse
#10
Matthew D Puhl, Rajeev I Desai, Shunsuke Takagi, Kendall T Presti, Michelle R Doyle, Rachel J Donahue, Samantha M Landino, Jack Bergman, William A Carlezon, Joseph T Coyle
Both schizophrenia (SZ) and substance abuse (SA) exhibit significant heritability. Moreover, N-methyl-d-aspartate receptors (NMDARs) have been implicated in the pathophysiology of both SZ and SA. We hypothesize that the high prevalence of comorbid SA in SZ is due to dysfunction of NMDARs caused by shared risk genes. We used transgenic mice with a null mutation of the gene encoding serine racemase (SR), the enzyme that synthesizes the NMDAR co-agonist d-serine and an established risk gene for SZ, to recreate the pathology of SZ...
November 23, 2017: Addiction Biology
https://www.readbyqxmd.com/read/29163080/behavioral-and-neurochemical-phenotyping-of-mice-incapable-of-homer1a-induction
#11
Michael C Datko, Jia-Hua Hu, Melanie Williams, Cindy M Reyes, Kevin D Lominac, Georg von Jonquieres, Matthias Klugmann, Paul F Worley, Karen K Szumlinski
Immediate early and constitutively expressed products of the Homer1 gene regulate the functional assembly of post-synaptic density proteins at glutamatergic synapses to influence excitatory neurotransmission and synaptic plasticity. Earlier studies of Homer1 gene knock-out (KO) mice indicated active, but distinct, roles for IEG and constitutively expressed Homer1 gene products in regulating cognitive, emotional, motivational and sensorimotor processing, as well as behavioral and neurochemical sensitivity to cocaine...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/29158359/are-cocaine-seeking-habits-necessary-for-the-development-of-addiction-like-behavior-in-rats
#12
Bryan F Singer, Monica Fadanelli, Alex B Kawa, Terry E Robinson
Drug self-administration models of addiction typically require animals to make the same response (e.g., a lever-press or nose-poke) over and over to procure and take drugs. By their design, such procedures often produce behavior controlled by stimulus-response (S-R) habits. This has supported the notion of addiction as a "drug habit", and has led to considerable advances in our understanding of the neurobiological basis of such behavior. However, for addicts to procure drugs, like cocaine, often requires considerable ingenuity and flexibility in seeking behavior, which, by definition, precludes the development of habits...
November 20, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29157751/preliminary-evidence-that-digit-length-ratio-2d-4d-predicts-neural-response-to-delivery-of-motivational-stimuli
#13
Troy A Webber, Heather E Soder, Geoffrey F Potts, Marina A Bornovalova
Reduced relative length of the 2nd to 4th digits (2D:4D) is thought to partially reflect fetal testosterone (FT) exposure, a process suspected to promote relatively permanent effects on the brain and behavior via structural and functional neuroadaptations. We examined the effect of 2D:4D on neural response - assessed by P2a and feedback-related negativity (FRN) event-related potentials (ERPs) - to motivational stimuli (reward or punishment) using two counterbalanced conditions of a passive S1/S2 outcome prediction design...
November 17, 2017: Biological Psychology
https://www.readbyqxmd.com/read/29153928/enhancing-excitability-of-dopamine-neurons-promotes-motivational-behaviour-through-increased-action-initiation
#14
Linde Boekhoudt, Ellen C Wijbrans, Jodie H K Man, Mieneke C M Luijendijk, Johannes W de Jong, Geoffrey van der Plasse, Louk J M J Vanderschuren, Roger A H Adan
Motivational deficits are a key symptom in multiple psychiatric disorders, including major depressive disorder, schizophrenia and addiction. A likely neural substrate for these motivational deficits is the brain dopamine (DA) system. In particular, DA signalling in the nucleus accumbens, which originates from DA neurons in the ventral tegmental area (VTA), has been identified as a crucial substrate for effort-related and activational aspects of motivation. Unravelling how VTA DA neuronal activity relates to motivational behaviours is required to understand how motivational deficits in psychiatry can be specifically targeted...
November 16, 2017: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29146502/protracted-motivational-dopamine-related-deficits-following-adolescence-sugar-overconsumption
#15
Fabien Naneix, Florence Darlot, Véronique De Smedt-Peyrusse, Jean-Rémi Pape, Etienne Coutureau, Martine Cador
Adolescence represents a critical period characterized by major neurobiological changes. Chronic stimulation of the reward system during adolescence might constitute an important factor of vulnerability to pathological development. Increasing evidences suggest that adolescent overconsumption of sweet palatable foods impact reward-based processes. However, the neurobiological bases of these deficits remain poorly understood. Previous studies have demonstrated motivational deficits for palatable foods after sweet diet exposure during adolescence that might involve the dopamine (DA) system, a central actor in incentive processes...
February 2018: Neuropharmacology
https://www.readbyqxmd.com/read/29142296/the-dopamine-motive-system-implications-for-drug-and-food-addiction
#16
REVIEW
Nora D Volkow, Roy A Wise, Ruben Baler
Behaviours such as eating, copulating, defending oneself or taking addictive drugs begin with a motivation to initiate the behaviour. Both this motivational drive and the behaviours that follow are influenced by past and present experience with the reinforcing stimuli (such as drugs or energy-rich foods) that increase the likelihood and/or strength of the behavioural response (such as drug taking or overeating). At a cellular and circuit level, motivational drive is dependent on the concentration of extrasynaptic dopamine present in specific brain areas such as the striatum...
November 16, 2017: Nature Reviews. Neuroscience
https://www.readbyqxmd.com/read/29128392/adrenergic-manipulation-inhibits-pavlovian-conditioned-approach-behaviors
#17
Kyle Z Pasquariello, Marina Han, Cagla Unal, Paul J Meyer
Environmental rewards and Pavlovian reward cues can acquire incentive salience, thereby eliciting incentive motivational states and instigate reward-seeking. In rats, the incentive salience of food cues can be measured during a Pavlovian conditioned approach paradigm, in which rats engage in cue-directed approach ("sign-tracking") or approach the food delivery location ("goal-tracking"). While it has been shown that dopamine signaling is necessary for sign-tracking, some studies have suggested that norepinephrine is involved in learning to sign-track as well...
November 8, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/29114273/formulation-and-characterization-of-nanomedicine-solid-lipid-nanoparticle-associate-with-the-extract-of-pterospermum-acerifolium-for-the-screening-of-neurochemicals-and-neuroendocrine-effects
#18
Ankur Choubey, Ritu Gilhotra, Santosh Kumar Singh, Gopal Garg
Background: Nanotechnology has given the likelihood of conveying medications to particular cells utilizing nanoparticles. Nanosystems can convey the dynamic constituent at an adequate fixation amid the whole treatment time frame, guiding it to the fancied site of activity. Traditional medications do not meet these necessities. The fundamental motivation behind creating elective medication conveyance advancements is to expand effectiveness of medication conveyance and security during the time spent medication conveyance and give more accommodation to the patient...
October 2017: Asian Journal of Neurosurgery
https://www.readbyqxmd.com/read/29110353/amotivation-is-associated-with-smaller-ventral-striatum-volumes-in-older-patients-with-schizophrenia
#19
Fernando Caravaggio, Gagan Fervaha, Yusuke Iwata, Eric Plitman, Jun Ku Chung, Shinichiro Nakajima, Wanna Mar, Philip Gerretsen, Julia Kim, M Mallar Chakravarty, Benoit Mulsant, Bruce Pollock, David Mamo, Gary Remington, Ariel Graff-Guerrero
OBJECTIVE: Motivational deficits are prevalent in patients with schizophrenia, persist despite antipsychotic treatment, and predict long-term outcomes. Evidence suggests that patients with greater amotivation have smaller ventral striatum (VS) volumes. We wished to replicate this finding in a sample of older, chronically medicated patients with schizophrenia. Using structural imaging and positron emission tomography, we examined whether amotivation uniquely predicted VS volumes beyond the effects of striatal dopamine D2/3 receptor (D2/3 R) blockade by antipsychotics...
November 7, 2017: International Journal of Geriatric Psychiatry
https://www.readbyqxmd.com/read/29109253/a-transient-dopamine-signal-encodes-subjective-value-and-causally-influences-demand-in-an-economic-context
#20
Scott A Schelp, Katherine J Pultorak, Dylan R Rakowski, Devan M Gomez, Gregory Krzystyniak, Raibatak Das, Erik B Oleson
The mesolimbic dopamine system is strongly implicated in motivational processes. Currently accepted theories suggest that transient mesolimbic dopamine release events energize reward seeking and encode reward value. During the pursuit of reward, critical associations are formed between the reward and cues that predict its availability. Conditioned by these experiences, dopamine neurons begin to fire upon the earliest presentation of a cue, and again at the receipt of reward. The resulting dopamine concentration scales proportionally to the value of the reward...
November 6, 2017: Proceedings of the National Academy of Sciences of the United States of America
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