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2.
Mol Psychiatry ; 29(10): 2967-2978, 2024 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-38615102

RESUMO

We report a mechanism that underlies stress-induced cognitive inflexibility at the molecular level. In a mouse model under subacute cellular stress in which deficits in rule shifting tasks were elicited, the nuclear glyceraldehyde dehydrogenase (N-GAPDH) cascade was activated specifically in microglia in the prelimbic cortex. The cognitive deficits were normalized with a pharmacological intervention with a compound (the RR compound) that selectively blocked the initiation of N-GAPDH cascade without affecting glycolytic activity. The normalization was also observed with a microglia-specific genetic intervention targeting the N-GAPDH cascade. At the mechanistic levels, the microglial secretion of High-Mobility Group Box (HMGB), which is known to bind with and regulate the NMDA-type glutamate receptors, was elevated. Consequently, the hyperactivation of the prelimbic layer 5 excitatory neurons, a neural substrate for cognitive inflexibility, was also observed. The upregulation of the microglial HMGB signaling and neuronal hyperactivation were normalized by the pharmacological and microglia-specific genetic interventions. Taken together, we show a pivotal role of cortical microglia and microglia-neuron interaction in stress-induced cognitive inflexibility. We underscore the N-GAPDH cascade in microglia, which causally mediates stress-induced cognitive alteration.


Assuntos
Microglia , Neurônios , Animais , Microglia/metabolismo , Camundongos , Masculino , Neurônios/metabolismo , Córtex Cerebral/metabolismo , Estresse Psicológico/metabolismo , Camundongos Endogâmicos C57BL , Cognição/fisiologia , Proteína HMGB1/metabolismo , Gliceraldeído-3-Fosfato Desidrogenases/metabolismo , Transdução de Sinais/fisiologia , Disfunção Cognitiva/metabolismo , Modelos Animais de Doenças , Núcleo Celular/metabolismo
3.
J Neurosci ; 43(45): 7538-7546, 2023 11 08.
Artigo em Inglês | MEDLINE | ID: mdl-37940587

RESUMO

The supramammillary nucleus (SuM) is a small region in the ventromedial posterior hypothalamus. The SuM has been relatively understudied with much of the prior focus being on its connection with septo-hippocampal circuitry. Thus, most studies conducted until the 21st century examined its role in hippocampal processes, such as theta rhythm and learning/memory. In recent years, the SuM has been "rediscovered" as a crucial hub for several behavioral and cognitive processes, including reward-seeking, exploration, and social memory. Additionally, it has been shown to play significant roles in hippocampal plasticity and adult neurogenesis. This review highlights findings from recent studies using cutting-edge systems neuroscience tools that have shed light on these fascinating roles for the SuM.


Assuntos
Hipotálamo Posterior , Motivação , Hipocampo , Ritmo Teta , Cognição
4.
Prog Neurobiol ; 212: 102252, 2022 05.
Artigo em Inglês | MEDLINE | ID: mdl-35227866

RESUMO

Reinforcement learning and goal-seeking behavior are thought to be mediated by midbrain dopamine neurons. However, little is known about neural substrates of curiosity and exploratory behavior, which occur in the absence of clear goal or reward. This is despite behavioral scientists having long suggested that curiosity and exploratory behaviors are regulated by an innate drive. We refer to such behavior as information-seeking behavior and propose 1) key neural substrates and 2) the concept of environment prediction error as a framework to understand information-seeking processes. The cognitive aspect of information-seeking behavior, including the perception of salience and uncertainty, involves, in part, the pathways from the posterior hypothalamic supramammillary region to the hippocampal formation. The vigor of such behavior is modulated by the following: supramammillary glutamatergic neurons; their projections to medial septal glutamatergic neurons; and the projections of medial septal glutamatergic neurons to ventral tegmental dopaminergic neurons. Phasic responses of dopaminergic neurons are characterized as signaling potentially important stimuli rather than rewards. This paper describes how novel stimuli and uncertainty trigger seeking motivation and how these neural substrates modulate information-seeking behavior.


Assuntos
Dopamina , Motivação , Neurônios Dopaminérgicos , Hipocampo , Humanos , Recompensa
5.
Nat Commun ; 13(1): 1386, 2022 03 16.
Artigo em Inglês | MEDLINE | ID: mdl-35296648

RESUMO

The prefrontal cortex is involved in goal-directed behavior. Here, we investigate circuits of the PFC regulating motivation, reinforcement, and its relationship to dopamine neuron activity. Stimulation of medial PFC (mPFC) neurons in mice activated many downstream regions, as shown by fMRI. Axonal terminal stimulation of mPFC neurons in downstream regions, including the anteromedial thalamic nucleus (AM), reinforced behavior and activated midbrain dopaminergic neurons. The stimulation of AM neurons projecting to the mPFC also reinforced behavior and activated dopamine neurons, and mPFC and AM showed a positive-feedback loop organization. We also found using fMRI in human participants watching reinforcing video clips that there is reciprocal excitatory functional connectivity, as well as co-activation of the two regions. Our results suggest that this cortico-thalamic loop regulates motivation, reinforcement, and dopaminergic neuron activity.


Assuntos
Neurônios Dopaminérgicos , Objetivos , Animais , Axônios , Neurônios Dopaminérgicos/fisiologia , Humanos , Camundongos , Vias Neurais/fisiologia , Córtex Pré-Frontal/fisiologia , Tálamo
6.
Pharmacol Rev ; 74(1): 119-140, 2022 01.
Artigo em Inglês | MEDLINE | ID: mdl-34987089

RESUMO

A widely held dogma in the preclinical addiction field is that females are more vulnerable than males to drug craving and relapse. Here, we first review clinical studies on sex differences in psychostimulant and opioid craving and relapse. Next, we review preclinical studies on sex differences in psychostimulant and opioid reinstatement of drug seeking after extinction of drug self-administration, and incubation of drug craving (time-dependent increase in drug seeking during abstinence). We also discuss ovarian hormones' role in relapse and craving in humans and animal models and speculate on brain mechanisms underlying their role in cocaine craving and relapse in rodent models. Finally, we discuss imaging studies on brain responses to cocaine cues and stress in men and women.The results of the clinical studies reviewed do not appear to support the notion that women are more vulnerable to psychostimulant and opioid craving and relapse. However, this conclusion is tentative because most of the studies reviewed were correlational, not sufficiently powered, and not a priori designed to detect sex differences. Additionally, imaging studies suggest sex differences in brain responses to cocaine cues and stress. The results of the preclinical studies reviewed provide evidence for sex differences in stress-induced reinstatement and incubation of cocaine craving but not cue- or cocaine-induced reinstatement of cocaine seeking. These sex differences are modulated in part by ovarian hormones. In contrast, the available data do not support the notion of sex differences in craving and relapse/reinstatement for methamphetamine or opioids in rodent models. SIGNIFICANCE STATEMENT: This systematic review summarizes clinical and preclinical studies on sex differences in psychostimulant and opioid craving and relapse. Results of the clinical studies reviewed do not appear to support the notion that women are more vulnerable to psychostimulant and opioid craving and relapse. Results of preclinical studies reviewed provide evidence for sex differences in reinstatement and incubation of cocaine seeking but not for reinstatement or incubation of methamphetamine or opioid seeking.


Assuntos
Transtornos Relacionados ao Uso de Cocaína , Cocaína , Analgésicos Opioides , Animais , Fissura , Extinção Psicológica , Feminino , Humanos , Masculino , Recidiva , Autoadministração , Caracteres Sexuais
7.
J Neurosci ; 42(10): 1987-1998, 2022 03 09.
Artigo em Inglês | MEDLINE | ID: mdl-35064000

RESUMO

Hippocampal theta oscillations (HTOs) during rapid eye movement (REM) sleep play an important role in mnemonic processes by coordinating hippocampal and cortical activities. However, it is not fully understood how HTOs are modulated by subcortical regions, including the median raphe nucleus (MnR). The MnR is thought to suppress HTO through its serotonergic outputs. Here, our study on male mice revealed a more complex framework indicating roles of nonserotonergic MnR outputs in regulating HTO. We found that nonselective optogenetic activation of MnR neurons at theta frequency increased HTO amplitude. Granger causality analysis indicated that MnR theta oscillations during REM sleep influence HTO. By using three transgenic mouse lines, we found that MnR serotonergic neurons exhibited little or no theta-correlated activity during HTO. Instead, most MnR GABAergic neurons and Vglut3 neurons respectively increased and decreased activities during HTO and exhibited hippocampal theta phase-locked activities. Although MnR GABAergic neurons do not directly project to the hippocampus, they could modulate HTO through local Vglut3 and serotonergic neurons as we found that MnR GABAergic neurons monosynaptically targeted Vglut3 and serotonergic neurons. Additionally, pontine wave recorded from the MnR during REM sleep accompanied nonserotonergic activity increase and HTO acceleration. These results suggest that MnR nonserotonergic neurons modulate hippocampal theta activity during REM sleep, which regulates memory processes.SIGNIFICANCE STATEMENT The MnR is the major source of serotonergic inputs to multiple brain regions including the hippocampus and medial septal area. It has long been thought that those serotonergic outputs suppress HTOs. However, our results revealed that MnR serotoninergic neurons displayed little firing changes during HTO. Instead, MnR Vglut3 neurons were largely silent during HTO associated with REM sleep. Additionally, many MnR GABAergic neurons fired rhythmically phase-locked to HTO. These results indicate an important role of MnR nonserotonergic neurons in modulating HTO.


Assuntos
Hipocampo , Núcleos da Rafe , Animais , Neurônios GABAérgicos/fisiologia , Hipocampo/fisiologia , Masculino , Camundongos , Septo do Cérebro , Neurônios Serotoninérgicos , Ritmo Teta/fisiologia
8.
Nat Commun ; 12(1): 2811, 2021 05 14.
Artigo em Inglês | MEDLINE | ID: mdl-33990558

RESUMO

The supramammillary region (SuM) is a posterior hypothalamic structure, known to regulate hippocampal theta oscillations and arousal. However, recent studies reported that the stimulation of SuM neurons with neuroactive chemicals, including substances of abuse, is reinforcing. We conducted experiments to elucidate how SuM neurons mediate such effects. Using optogenetics, we found that the excitation of SuM glutamatergic (GLU) neurons was reinforcing in mice; this effect was relayed by their projections to septal GLU neurons. SuM neurons were active during exploration and approach behavior and diminished activity during sucrose consumption. Consistently, inhibition of SuM neurons disrupted approach responses, but not sucrose consumption. Such functions are similar to those of mesolimbic dopamine neurons. Indeed, the stimulation of SuM-to-septum GLU neurons and septum-to-ventral tegmental area (VTA) GLU neurons activated mesolimbic dopamine neurons. We propose that the supramammillo-septo-VTA pathway regulates arousal that reinforces and energizes behavioral interaction with the environment.


Assuntos
Neurônios Dopaminérgicos/fisiologia , Hipotálamo Posterior/citologia , Hipotálamo Posterior/fisiologia , Animais , Comportamento Animal/efeitos dos fármacos , Comportamento Animal/fisiologia , Comportamento Consumatório/efeitos dos fármacos , Comportamento Consumatório/fisiologia , Dopamina/fisiologia , Feminino , Ácido Glutâmico/fisiologia , Imageamento por Ressonância Magnética , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Transgênicos , Modelos Neurológicos , Vias Neurais/citologia , Vias Neurais/fisiologia , Optogenética , Ratos , Ratos Wistar , Reforço Psicológico , Septo do Cérebro/citologia , Septo do Cérebro/efeitos dos fármacos , Septo do Cérebro/fisiologia , Área Tegmentar Ventral/citologia , Área Tegmentar Ventral/fisiologia , Ácido alfa-Amino-3-hidroxi-5-metil-4-isoxazol Propiônico/administração & dosagem
9.
Commun Biol ; 4(1): 66, 2021 01 14.
Artigo em Inglês | MEDLINE | ID: mdl-33446857

RESUMO

Intracranial self-stimulation, in which an animal performs an operant response to receive regional brain electrical stimulation, is a widely used procedure to study motivated behavior. While local neuronal activity has long been measured immediately before or after the operant, imaging the whole brain in real-time remains a challenge. Herein we report a method that permits functional MRI (fMRI) of brain dynamics while mice are cued to perform an operant task: licking a spout to receive optogenetic stimulation to the medial prefrontal cortex (MPFC) during a cue ON, but not cue OFF. Licking during cue ON results in activation of a widely distributed network consistent with underlying MPFC projections, while licking during cue OFF (without optogenetic stimulation) leads to negative fMRI signal in brain regions involved in acute extinction. Noninvasive whole brain readout combined with circuit-specific neuromodulation opens an avenue for investigating adaptive behavior in both healthy and disease models.


Assuntos
Encéfalo/diagnóstico por imagem , Encéfalo/fisiologia , Optogenética/métodos , Animais , Comportamento Animal/fisiologia , Sinais (Psicologia) , Imageamento por Ressonância Magnética , Masculino , Camundongos Endogâmicos C57BL , Córtex Pré-Frontal/fisiologia , Sacarose
10.
Front Neurosci ; 15: 824741, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-35197820

RESUMO

Studies using either continuous or intermittent access cocaine self-administration procedures showed that cocaine seeking increases during abstinence (incubation of cocaine craving), and that this effect is higher after intermittent cocaine access. Other studies showed that cocaine abstinence is characterized by the emergence of stress- and anxiety-related states which were hypothesized to increase relapse vulnerability. We examined whether incubation of cocaine craving and anxiety-related behaviors are correlated and whether intermittent cocaine self-administration would potentiate these behaviors during abstinence. Male rats self-administered cocaine either continuously (6 h/day) or intermittently (5 min ON, 25 min OFF × 12) for 14 days, followed by relapse tests after 1 or 21 abstinence days. A group of rats that self-administered saline served as a control. Anxiety-related behaviors were measured on the same abstinence days, using the novelty induced-hypophagia test. Finally, motivation for cocaine was measured using a progressive ratio reinforcement schedule. Lever-presses after 21 abstinence days were higher than after 1 day and this incubation effect was higher in the intermittent access group. Progressive ratio responding was also higher after intermittent cocaine access. Intermittent and continuous cocaine access did not induce anxiety-like responses in the novelty-induced hypophagia test after 1 or 21 abstinence days. Independent of the access condition, incubation of cocaine seeking was not correlated with the novelty-induced hypophagia measures. Results suggest that cocaine-induced anxiety-related states during protracted abstinence do not contribute to incubation of cocaine craving. However, this conclusion is tentative because we used a single anxiety-related measure and did not test female rats.

11.
PLoS One ; 15(10): e0240505, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33031482

RESUMO

The survival of an organism depends on the ability to make adaptive decisions to achieve the needs of the organism: where to get food, who to mate with, and how to evade predators. Decision-making is a term used to describe a collection of behavioral and/or computational functions that guide the selection of an option amongst a set of alternatives. Some of these functions may include calculating the costs and benefits of a particular action, evaluating differences in value of each of the alternative outcomes and the likelihood of receiving a particular outcome, using past experiences to generate predictions or expectations about action-outcome associations, and/or integration of past experiences to make novel inferences that can be used in new environments. There is considerable interest in understanding the neurobiological mechanisms that mediate these decision-making functions and recent advances in behavioral approaches, neuroscience techniques, and neuroimaging measures have begun to develop mechanistic links between biology, reward, and decision making. This multidisciplinary work holds great promise for elucidating the biological mechanisms mediating decision-making deficits in normal and abnormal states. The multidisciplinary studies included in this Collection provide new insights into the neuroscience of decision making and reward.


Assuntos
Tomada de Decisões , Publicações Periódicas como Assunto , Recompensa , Humanos , Neurobiologia , Neurociências
12.
Science ; 366(6469): 1071-1072, 2019 11 29.
Artigo em Inglês | MEDLINE | ID: mdl-31780542
13.
Biol Psychiatry ; 85(11): 915-924, 2019 06 01.
Artigo em Inglês | MEDLINE | ID: mdl-30846301

RESUMO

BACKGROUND: Studies using continuous-access drug self-administration showed that cocaine seeking increases during abstinence (incubation of cocaine craving). Recently, studies using intermittent-access self-administration showed increased motivation to self-administer and seek cocaine. We examined whether intermittent cocaine self-administration would potentiate incubation of craving in male and female rats and examined the estrous cycle's role in this incubation. METHODS: In experiment 1, male and female rats self-administered cocaine either continuously (8 hours/day) or intermittently (5 minutes ON, 25 minutes OFF × 16) for 12 days, followed by relapse tests after 2 or 29 days. In experiments 2 and 3, female rats self-administered cocaine intermittently for six, 12, or 18 sessions. In experiment 4, female rats self-administered cocaine continuously followed by relapse tests after 2 or 29 days. In experiments 3 and 4, the estrous cycle was measured using a vaginal smear test. RESULTS: Incubation of cocaine craving was observed in both sexes after either intermittent or continuous drug self-administration. Independent of access condition and abstinence day, cocaine seeking was higher in female rats than in male rats. In both sexes, cocaine seeking on both abstinence days was higher after intermittent drug access than after continuous drug access. In female rats, incubation of craving after either intermittent or continuous drug access was significantly higher during estrus than during non-estrus; for intermittent drug access, this effect was independent of the training duration. CONCLUSIONS: In both sexes, intermittent cocaine access caused time-independent increases in drug seeking during abstinence. In female rats, the time-dependent increase in drug seeking (incubation) is critically dependent on the estrous cycle phase.


Assuntos
Cocaína/farmacologia , Fissura/efeitos dos fármacos , Fissura/fisiologia , Ciclo Estral/fisiologia , Caracteres Sexuais , Animais , Extinção Psicológica , Feminino , Masculino , Ratos , Autoadministração/métodos , Fatores de Tempo
14.
PLoS One ; 14(2): e0211375, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30785908

RESUMO

Despite the importance of predicting evacuation mobility dynamics after large scale disasters for effective first response and disaster relief, our general understanding of evacuation behavior remains limited because of the lack of empirical evidence on the evacuation movement of individuals across multiple disaster instances. Here we investigate the GPS trajectories of a total of more than 1 million anonymized mobile phone users whose positions were tracked for a period of 2 months before and after four of the major earthquakes that occurred in Japan. Through a cross comparative analysis between the four disaster instances, we find that in contrast to the assumed complexity of evacuation decision making mechanisms in crisis situations, an individual's evacuation probability is strongly dependent on the seismic intensity that they experience. In fact, we show that the evacuation probabilities in all earthquakes collapse into a similar pattern, with a critical threshold at around seismic intensity 5.5. This indicates that despite the diversity in the earthquakes profiles and urban characteristics, evacuation behavior is similarly dependent on seismic intensity. Moreover, we found that probability density functions of the distances that individuals evacuate are not dependent on seismic intensities that individuals experience. These insights from empirical analysis on evacuation from multiple earthquake instances using large scale mobility data contributes to a deeper understanding of how people react to earthquakes, and can potentially assist decision makers to simulate and predict the number of evacuees in urban areas with little computational time and cost. This can be achieved by utilizing only the information on population density distribution and seismic intensity distribution, which can be observed instantaneously after the shock.


Assuntos
Terremotos , Telefone Celular , Bases de Dados Factuais , Planejamento em Desastres , Sistemas de Informação Geográfica , Humanos , Japão
15.
Psychopharmacology (Berl) ; 234(14): 2197-2206, 2017 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-28391507

RESUMO

RATIONALE: It is necessary to understand better how chronic food restriction (CFR) and psychostimulant drugs interact in motivated behavior unrelated to food or energy homeostasis. OBJECTIVES: We examined whether CFR augments methylphenidate (MPH)-potentiated responding reinforced by visual sensation (VS) and whether repeated MPH injections or prolonged CFR further augments such responses. METHODS: Before starting the following experiments, rats on a CFR diet received a limited daily ration in such a way that their body weights decreased to 85-90% of their original weights over 2 weeks. In experiment 1, rats on CFR and ad libitum diet received four injections of varying MPH doses (0, 2.5, 5, and 10 mg/kg). In experiment 2, CFR and ad libitum groups received repeated injections of MPH (2.5 mg/kg). In experiment 3, half of CFR rats received repeated injections of MPH (2.5 mg/kg), and the other half received saline, and following a 7-day abstinence, they all received the 2.5-mg/kg dose of MPH. RESULTS: CFR rats increased VS-reinforced responding more than ad libitum rats when they received MPH. Repeated injections of MPH with prolonged CFR further increased VS-reinforced responding. We found a double dissociation where prolonged CFR (3 vs. 6 weeks) made VS-reinforced responding, but not locomotor activity, more responsive to MPH, whereas repeated MPH injections made locomotor activity, but not VS-reinforced responding, more responsive to MPH. CONCLUSIONS: CFR markedly potentiates effects of MPH on VS-reinforced responding. The present study demonstrates that the longer CFR continues, the greater psychostimulant drugs augment behavioral interaction with salient stimuli.


Assuntos
Peso Corporal/efeitos dos fármacos , Estimulantes do Sistema Nervoso Central/farmacologia , Metilfenidato/farmacologia , Animais , Alimentos , Masculino , Ratos , Ratos Sprague-Dawley , Reforço Psicológico , Sensação
16.
Cell Rep ; 18(11): 2584-2591, 2017 03 14.
Artigo em Inglês | MEDLINE | ID: mdl-28297663

RESUMO

Dopamine neurons in the ventral tegmental area (VTA) were previously found to express vesicular glutamate transporter 2 (VGLUT2) and to co-transmit glutamate in the ventral striatum (VStr). This capacity may play an important role in reinforcement learning. Although it is known that activation of the VTA-VStr dopamine system readily reinforces behavior, little is known about the role of glutamate co-transmission in such reinforcement. By combining electrode recording and optogenetics, we found that stimulation of VTA dopamine neurons in vivo evoked fast excitatory responses in many VStr neurons of adult mice. Whereas conditional knockout of the gene encoding VGLUT2 in dopamine neurons largely eliminated fast excitatory responses, it had little effect on the acquisition of conditioned responses reinforced by dopamine neuron activation. Therefore, glutamate co-transmission appears dispensable for acquisition of conditioned responding reinforced by DA neuron activation.


Assuntos
Comportamento Animal , Condicionamento Psicológico , Neurônios Dopaminérgicos/metabolismo , Ácido Glutâmico/metabolismo , Animais , Camundongos Knockout , Neostriado/metabolismo , Optogenética , Área Tegmentar Ventral/metabolismo , Proteína Vesicular 2 de Transporte de Glutamato/metabolismo
17.
J Neurosci ; 36(41): 10663-10672, 2016 10 12.
Artigo em Inglês | MEDLINE | ID: mdl-27733616

RESUMO

Hippocampal-cortical interaction during sleep promotes transformation of memory for long-term storage in the cortex. In particular, hippocampal sharp-wave ripple-associated neural activation is important for this transformation during slow-wave sleep. The anterior cingulate cortex (ACC) has been shown to be crucial for expression and likely storage of long-term memory. However, little is known about how ACC activity is influenced by hippocampal ripple activity during sleep. We report here about coordinated interactions between hippocampal ripple activity and ACC neural firings. By recording from the ACC and hippocampal CA1 simultaneously in mice, we found that almost all ACC neurons showed increased activity before hippocampal ripple activity; moreover, a subpopulation (17%) displayed a further activation immediately after ripple activity. This postripple activation of ACC neurons correlated positively with ripple amplitude, and the same neurons were excited upon electrical stimulation of the CA1. Interestingly, the preripple activation of ACC neurons was present during the sleep state, but not during the awake state. These results suggest intimate interactions between hippocampal sharp-wave ripples and ACC neurons in a state-dependent manner. Importantly, sharp-wave ripples and associated activation appear to regulate activity of a small population of ACC neurons, a process that may play a critical role in memory consolidation. SIGNIFICANCE STATEMENT: The hippocampus communicates with the cortex for memory transformation. Memories of previous experiences become less dependent on the hippocampus and increasingly dependent on cortical areas, such as the anterior cingulate cortex (ACC). However, little evidence is available to directly support this hippocampus-to-cortex information transduction hypothesis of memory consolidation. Here we show that a subpopulation of ACC neurons becomes active just after hippocampal ripple activity, and that electrical stimulation of the hippocampus excites the same ACC neurons. In addition, the majority of ACC neurons are activated just before ripple activity during the sleep state, but not during the awake state. These results provide evidence supporting the hypothesis of hippocampus-to-cortex information flow for memory consolidation as well as reciprocal interaction between the hippocampus and the cortex.


Assuntos
Giro do Cíngulo/fisiologia , Hipocampo/fisiologia , Sono/fisiologia , Potenciais de Ação/fisiologia , Animais , Região CA1 Hipocampal/fisiologia , Estimulação Elétrica , Eletroencefalografia , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Vigília/fisiologia
18.
Cell Rep ; 16(10): 2699-2710, 2016 09 06.
Artigo em Inglês | MEDLINE | ID: mdl-27568569

RESUMO

The ventral tegmental area (VTA) receives phenotypically distinct innervations from the pedunculopontine tegmental nucleus (PPTg). While PPTg-to-VTA inputs are thought to play a critical role in stimulus-reward learning, direct evidence linking PPTg-to-VTA phenotypically distinct inputs in the learning process remains lacking. Here, we used optogenetic approaches to investigate the functional contribution of PPTg excitatory and inhibitory inputs to the VTA in appetitive Pavlovian conditioning. We show that photoinhibition of PPTg-to-VTA cholinergic or glutamatergic inputs during cue presentation dampens the development of anticipatory approach responding to the food receptacle during the cue. Furthermore, we employed in vivo optetrode recordings to show that photoinhibition of PPTg cholinergic or glutamatergic inputs significantly decreases VTA non-dopamine (non-DA) neural activity. Consistently, photoinhibition of VTA non-DA neurons disrupts the development of cue-elicited anticipatory approach responding. Taken together, our study reveals a crucial regulatory mechanism by PPTg excitatory inputs onto VTA non-DA neurons during appetitive Pavlovian conditioning.


Assuntos
Apetite/fisiologia , Condicionamento Clássico/fisiologia , Neurônios Dopaminérgicos/fisiologia , Aprendizagem , Núcleo Tegmental Pedunculopontino/fisiologia , Área Tegmentar Ventral/fisiologia , Animais , Apetite/efeitos da radiação , Condicionamento Clássico/efeitos da radiação , Sinais (Psicologia) , Neurônios Dopaminérgicos/efeitos da radiação , Glutamatos/metabolismo , Luz , Masculino , Camundongos Endogâmicos C57BL , Núcleo Tegmental Pedunculopontino/efeitos da radiação , Recompensa , Área Tegmentar Ventral/efeitos da radiação
19.
Behav Brain Res ; 290: 17-31, 2015 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-25907747

RESUMO

Dopamine neurons located in the midbrain play a role in motivation that regulates approach behavior (approach motivation). In addition, activation and inactivation of dopamine neurons regulate mood and induce reward and aversion, respectively. Accumulating evidence suggests that such motivational role of dopamine neurons is not limited to those located in the ventral tegmental area, but also in the substantia nigra. The present paper reviews previous rodent work concerning dopamine's role in approach motivation and the connectivity of dopamine neurons, and proposes two working models: One concerns the relationship between extracellular dopamine concentration and approach motivation. High, moderate and low concentrations of extracellular dopamine induce euphoric, seeking and aversive states, respectively. The other concerns circuit loops involving the cerebral cortex, basal ganglia, thalamus, epithalamus, and midbrain through which dopaminergic activity alters approach motivation. These models should help to generate hypothesis-driven research and provide insights for understanding altered states associated with drugs of abuse and affective disorders.


Assuntos
Gânglios da Base/fisiologia , Neurônios Dopaminérgicos/fisiologia , Motivação/fisiologia , Rede Nervosa/fisiologia , Recompensa , Animais
20.
Nat Neurosci ; 18(5): 728-35, 2015 May.
Artigo em Inglês | MEDLINE | ID: mdl-25867120

RESUMO

Sharp wave-associated field oscillations (∼200 Hz) of the hippocampus, referred to as ripples, are believed to be important for consolidation of explicit memory. Little is known about how ripples are regulated by other brain regions. We found that the median raphe region (MnR) is important for regulating hippocampal ripple activity and memory consolidation. We performed in vivo simultaneous recording in the MnR and hippocampus of mice and found that, when a group of MnR neurons was active, ripples were absent. Consistently, optogenetic stimulation of MnR neurons suppressed ripple activity and inhibition of these neurons increased ripple activity. Notably, using a fear conditioning procedure, we found that photostimulation of MnR neurons interfered with memory consolidation. Our results demonstrate a critical role of the MnR in regulating ripples and memory consolidation.


Assuntos
Mapeamento Encefálico , Ondas Encefálicas/fisiologia , Hipocampo/fisiologia , Memória/fisiologia , Núcleos da Rafe/fisiologia , Animais , Aprendizagem da Esquiva/fisiologia , Relógios Biológicos , Região CA1 Hipocampal/fisiologia , Condicionamento Clássico/fisiologia , Medo , Neurônios GABAérgicos/fisiologia , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Transgênicos , Optogenética , Estimulação Luminosa , Distribuição Aleatória , Neurônios Serotoninérgicos/fisiologia
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