Dieses Projekt wurde durch die NIH gewährt DA19112 (DGW) und DA026994 (CMO) unterstützt. Illustration wurde von Katherine Louderback zur Verfügung gestellt. Die Experimente wurden in der Vanderbilt Murine Neuropsychologische Labor durchgeführt.

1. Schreiben Programm operanten Test-Sessions laufen mit vielfältigen visuellen und auditiven Reizen als Verstärker <ol><li> Für festen Verhältnis (FR) Sitzungen: make Sitzungen 1 Stunde lang mit Haus Licht und Lüfter eingeschaltet während der Sitzung. Für progressive Verhältnis Sitzungen, Sitzungen zu 2 Stunden lang. Haben beide Hebel für die Dauer der Sitzung und Gegengewicht, die Hebel als &quot;aktiv&quot; vs &quot;inaktiv&quot; ist über Tiere (Hebel-Zuweisung für jedes Tier ändert sich nie) erweitert. </li><li> Code des Programms in einer Weise, dass jeder Verstärker entsprechend der folgenden Parameter ist vielfältig: <ul><li> jeder Verstärker verfügt über eine der folgenden Laufzeiten zufällig gewählt: 2, 4, 6 oder 8 Sekunden. </li><li> jeder Verstärker verfügt über eine der folgenden Stimulus-Lampe blinkt Raten zufällig gewählt: 0,625, 1,25, 2,5 oder 5 Hz, jeweils mit einem Tastverhältnis von 50%. </li><li> jeden Stimulus-Lampe blinkt nach dem Zufallsprinzip entweder auf der linken oder der rechten Seite der Kammer. </li><li> bieten eine akustische Impulse für die Dauer der Verstärker, die in unserem Labor, lösen wir eine Infusionspumpe, die klingen ca. 3 dB bietet über die Geräuschkulisse in der Kammer. </li></ul></li><li> Code des Programms auf die folgenden Werte in Echtzeit-Anzeige: 1. Anzahl der aktiven Hebel drückt, 2. Anzahl der inaktiven Hebel drückt, 3. Anzahl der Verstärker, 4. Time (in 0,1 Sekunden-Schritten). </li></ol> 2. Handle Tiere (3 Tage-Verfahren) <ol><li> Nach Akklimatisierung an die Tierhaltung, beginnen mit den Tieren umgehen. Dies wird gewöhnen sich die Tiere werden abgeholt und transportiert werden. </li><li> Starten Sie, indem behandschuhten Hände in den Käfig und ließ sie sitzen für 90 sek. Wenn jede Maus hat nicht die Hände in dieser Zeit untersucht, sanft bewegen Hände zu Mäusen und warten für jeden zu schnuppern und / oder kontaktieren Sie Ihre Hände, bevor Sie fortfahren. </li><li> Vorsichtig holen jeder Maus einen nach dem anderen durch die Basis des Schwanzes und legen Sie es auf der Hand, schnell heben ihn auf und brachte es wieder nach unten, damit die Maus, um zu Fuß von der Hand in den Käfig zurück. </li><li> Wiederholen Sie für jede Maus 5-10 mal, je nach Verhalten der Maus. Die letzte Zeit dies geschehen ist, halten Sie die Maustaste hoch (mit ihm stehend auf der Hand) für einen bestimmten Zeitraum, je nach Tag. Tag 1: 5 sec, Tag 2: 10 sec, Tag 3: 15 sek. Stellen Sie sicher, dass jede Maus dieses Kriterium erfüllt für den Tag. Am Tag 1, die Handschuhe wechseln zwischen den Käfigen. </li><li> Beginnend am Tag 2, Schlaganfall den Rücken des Tieres, während sich die Maus auf der Hand. Auch am Tag 2, beginnen mit einem Gewicht der Tiere täglich. Mark jedes Tier den Schwanz mit einem Sharpie zu unterwerfen angibt. </li><li> Wenn Injektionen während des Experiments gegeben wird, beginnen gewöhnen Mäusen Injektionen am Tag 2. Dies sollte geschehen, nachdem alle Mäuse im Käfig haben gehandhabt worden und erfüllt das Kriterium für den Tag sein. </li></ol> 3. Saubere und Prüfmittel <ol><li> Wash Bodenwanne mit heißem Wasser. </li><li> Saubere operante Kammer Wände und Böden mit 30% Ethanol. </li><li> Führen Sie einen Test-Programm, das auf Haus Licht, Ventilator und Stimulus Licht dreht, erstreckt Hebel, und Aufzeichnungen Hebelpressen. </li><li> Stellen Sie sicher, dass alle Lichter und die Fans sind richtig funktioniert und das Programm testen, um sicherzustellen, dass alle Hebel drückt aufgezeichnet werden. </li><li> Saubere Hebel mit 30% Ethanol. </li></ol> 4. Führen operanten Sitzung (Sitzungen sollten 5-6 Tage / Woche zur gleichen Zeit des Tages) <ol><li> Wiegen jeder Maus. </li><li> Laden Sie das Programm in jeder Kammer und kommentieren das Experiment entsprechend. Die aktive Hebel sollte zwischen Tieren (dh die aktive Hebel ist, um den linken Hebel für die Hälfte der Mäuse zugeordnet, der rechte Hebel ist für die andere Hälfte aktiv) ausgeglichen werden, sondern die aktive Hebel Seite ändert sich nie wieder mit der Maus eine Maus wurde zugewiesen. </li><li> Transport jeder Maus, die benannte Kammer, in der Nähe der Kammer, und starten Sie die Sitzung. </li><li> Nach der Sitzung endet, umgehend entfernen Sie die Maus und re-mark den Schwanz. </li><li> Reinigen Sie Kammern wie in Abschnitt 3 beschrieben. </li><li> Analysieren von Daten für die Anzahl der aktiven und inaktiven Hebel drückt. Anzahl der Verstärker und / oder Hebel Genauigkeit (% aktiv Hebelpressen) können ebenfalls gemeldet werden. Wenn Mäuse gehen, um für die Wirkung einer Behandlung auf OSS geprüft werden, sicherzustellen, dass alle Mäuse getestet werden müssen Akquisition Kriterien erfüllt (z. B.&gt; 20 aktive Hebelpressen und&gt; 65% aktive Hebelpressen für drei letzten FR-1-Sessions ) vor Beginn der Behandlung. </li><li> Nach Erwerb der FR-1 reagiert, den Zeitplan für die Verstärkung verändert werden kann (zum Beispiel einen höheren festen Verhältnis, progressive Verhältnis, random-Verhältnis, etc.) sein. </li></ol> 5. Repräsentative Ergebnisse Ein Beispiel für OSS Erwerb von männlichen C57BL/6J-Mäuse ist in Abbildung 1 (reproduziert aus 23) gezeigt. Kontrollmäuse unterzog identischen Bedingungen, außer, dass der Hebel drückt auf beiden Hebel hatte keine KonsequenzenSequenz. Eine weitere Gruppe von Mäusen ist in Abbildung 2 dargestellt. In diesem Experiment erhielt eine Gruppe von Mäusen OSS Verstärkung, während die andere Gruppe erhielt Verstärkung durch Essen. Wir haben festgestellt, dass unter den Bedingungen der ad libitum Zugang zu Nahrung, sowohl feste als auch progressive Verhältnis reagiert ähnlich zwischen OSS und die Reaktion für 10% sicher (Abb. 2, A und B) sind. Dies ermöglicht eine effektive Vergleiche von einer Manipulation an zwei verschiedenen Typen Verstärkung (sensorische und Nahrungsmittel), dass potenzielle verwechselt, die sich aus Hunger Staat oder Unterschiede in der Rücklaufquote vermeidet. <img src="/files/ftp_upload/2292/2292fig1.jpg" alt="Abbildung 1" /> Abbildung 1:. Lever Pressen von OSS-Mäusen und Kontrollen OSS Mäuse erhielten vielfältige visuelle und auditive Reize nach jedem aktiven Hebel zu drücken (FR-1 Zeitplan der Bewehrung), während inaktive Hebelpressen hatte keine Konsequenz. Kontrollmäuse unterzog den gleichen Bedingungen, aber es gab keine Folge der Sie entweder den Hebel (Hebel 1 und 2 bezeichnet und sind ausgeglichen über Tiere in der gleichen Weise, dass aktive und inaktive Hebel für OSS-Mäuse sind ausgeglichen). Aktive Hebel drücken von OSS-Mäusen war relativ erhöht, um inaktive Hebel drücken (* p &lt;0,05, ** p &lt;0,01) und unverstärkten Hebel drücken durch Kontrollen (n = 7 8, $ p &lt;0,05, $ $ p &lt;0,01 ). Abbildung reproduziert aus 23. <img src="/files/ftp_upload/2292/2292fig2.jpg" alt="Abbildung 2" /> Abbildung 2:. Lever Pressen von OSS-Mäuse und Mäuse reagieren nach Nahrung A.) Mäuse reagierten auf einen FR-1 Zeitplan der Bewehrung für OSS Reize oder Lebensmittel Verstärker (10% sicher). Alle Mäuse hatten ad libidum Zugang zu Nahrung für die Dauer der Experimente. B.) Nach FR-1-Sessions wurden die Mäuse zu einer fortschreitenden Ratio (PR) Zeitplan für die Verstärkung für 5 Tage fortgeschritten. Die Daten repräsentieren die Mittel der Werte aus den Tagen vier und fünf für jedes Tier. Die endgültige Verhältnis abgeschlossen ist auf der rechten Y-Achse gemeldet und bezieht sich auf die Anzahl der Antworten erforderlich, um die entsprechenden Verstärker (dh 30 Antworten sind erforderlich, um die 10 th Verstärker, nachdem zuvor verdiente neun Verstärker zu erhalten) zu erhalten.

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Operante sensation seeking ist eine sinnvolle Alternative zu intravenösen Drogenkonsum Selbstverwaltung, wenn die Maus das Tier der Wahl ist. Die Tatsache, dass weder Operation noch Katheter Wartung erforderlich ist, ist vorteilhaft, da diese erhebliche technische Hürden bei der Maus. OSS ist auch attraktiv, weil es die Messung werden Aspekte der Verstärkung unterscheiden sich von anderen natürlichen Verstärker wie Essen. Es ist nützlich zu beachten, dass Verhaltensmaßnahmen bei der M...

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<td>Drug self-administration test package for mouse: extra-wide chamber and retractable levers</td>
<td>&nbsp;</td>
<td><a href="http://www.med-associates.com/">Med Associates, Inc</a></td>
<td>MED-307W-CT-D1</td>
<td>Levers are ultra-sensitive (require ~2 grams force) and are mounted 2.2 cm above the floor. Yellow stimulus lamps are mounted 2 cm above each lever.</td>
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<td>Interface and software package</td>
<td>&nbsp;</td>
<td><a href="http://www.med-associates.com/">Med Associates, Inc</a></td>
<td>MED-SYST-16</td>
<td>This is the package for up to 16 chambers.</td>
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operant sensation seeking in the mouse

Operant methods are powerful behavioral tools for the study of motivated behavior. These 'self-administration' methods have been used extensively in drug addiction research due to their high construct validity. Operant studies provide researchers a tool for preclinical investigation of several aspects of the addiction process. For example, mechanisms of acute reinforcement (both drug and non-drug) can be tested using pharmacological or genetic tools to determine the ability of a molecular target to influence self-administration behavior1-6. Additionally, drug or food seeking behaviors can be studied in the absence of the primary reinforcer, and the ability of pharmacological compounds to disrupt this process is a preclinical model for discovery of molecular targets and compounds that may be useful for the treatment of addiction3,7-9. One problem with performing intravenous drug self-administration studies in the mouse is the technical difficulty of maintaining catheter patency. Attrition rates in these experiments are high and can reach 40% or higher10-15. Another general problem with drug self-administration is discerning which pharmacologically-induced effects of the reinforcer produce specific behaviors. For example, measurement of the reinforcing and neurological effects of psychostimulants can be confounded by their psychomotor effects. Operant methods using food reinforcement can avoid these pitfalls, although their utility in studying drug addiction is limited by the fact that some manipulations that alter drug self-administration have a minimal impact on food self-administration. For example, mesolimbic dopamine lesion or knockout of the D1 dopamine receptor reduce cocaine self-administration without having a significant impact on food self-administration 12,16. 
Sensory stimuli have been described for their ability to support operant responding as primary reinforcers (i.e. not conditioned reinforcers)17-22. Auditory and visual stimuli are self-administered by several species18,21,23, although surprisingly little is known about the neural mechanisms underlying this reinforcement. The operant sensation seeking (OSS) model is a robust model for obtaining sensory self-administration in the mouse, allowing the study of neural mechanisms important in sensory reinforcement24. An additional advantage of OSS is the ability to screen mutant mice for differences in operant behavior that may be relevant to addiction. We have reported that dopamine D1 receptor knockout mice, previously shown to be deficient in psychostimulant self-administration, also fail to acquire OSS24. This is a unique finding in that these mice are capable of learning an operant task when food is used as a reinforcer. While operant studies using food reinforcement can be useful in the study of general motivated behavior and the mechanisms underlying food reinforcement, as mentioned above, these studies are limited in their application to studying molecular mechanisms of drug addiction. Thus, there may be similar neural substrates mediating sensory and psychostimulant reinforcement that are distinct from food reinforcement, which would make OSS a particularly attractive model for the study of drug addiction processes. The degree of overlap between other molecular targets of OSS and drug reinforcers is unclear, but is a topic that we are currently pursuing. While some aspects of addiction such as resistance to extinction may be observed with OSS, we have found that escalation 25 is not observed in this model24. Interestingly, escalation of intake and some other aspects of addiction are observed with self-administration of sucrose26. Thus, when non-drug operant procedures are desired to study addiction-related processes, food or sensory reinforcers can be chosen to best fit the particular question being asked. 
In conclusion, both food self-administration and OSS in the mouse have the advantage of not requiring an intravenous catheter, which allows a higher throughput means to study the effects of pharmacological or genetic manipulation of neural targets involved in motivation. While operant testing using food as a reinforcer is particularly useful in the study of the regulation of food intake, OSS is particularly apt for studying reinforcement mechanisms of sensory stimuli and may have broad applicability to novelty seeking and addiction.

Watch this Scientific Journal Video about Operant Sensation Seeking in the Mouse at JoVE.com

Operant Sensation Seeking in the Mouse

In diesem Protokoll beschreiben wir eine Methode der operanten Lernen mit Sinnesreizen als Verstärker in der Maus. Es erfordert keine vorherige Schulung oder Lebensmittel Beschränkung, und es erlaubt das Studium der motiviertes Verhalten ohne den Einsatz eines pharmakologischen oder natürliche Verstärker wie Essen.

Operante Sensation Seeking in der Maus

Operant methods are powerful behavioral tools for the study of motivated behavior.  These 'self-administration' methods have been used extensively in drug ...

Research

JoVE Journal

Neuroscience

12.9K Aufrufe.  Vanderbilt University Medical Center. In diesem Protokoll beschreiben wir eine Methode der operanten Lernen mit Sinnesreizen als Verstärker in der Maus. Es erfordert keine vorherige Schulung oder Lebensmittel Beschränkung, und es erlaubt das Studium der motiviertes Verhalten ohne den Einsatz eines pharmakologischen oder natürliche Verstärker wie Essen.

Serie: Operant Sensation Seeking in the Mouse

A Procedure for Studying the Footshock-Induced Reinstatement of Cocaine Seeking in Laboratory Rats

The most insidious aspect of drug addiction is the high propensity for relapse. Animal models of relapse, known as reinstatement procedures, have been used extensively to study the neurobiology and phenomenology of relapse to drug use. Although procedural variations have emerged over the past several decades, the most conventional reinstatement procedures are based on the drug self-administration (SA) model. In this model, an animal is trained to perform an operant response to obtain drug. Subsequently, the behavior is extinguished by withholding response-contingent reinforcement. Reinstatement of drug seeking is then triggered by a discrete event, such as an injection of the training drug, re-exposure to drug-associated cues, or exposure to a stressor 1.
Reinstatement procedures were originally developed to study the ability of acute non-contingent exposure to the training drug to reinstate drug seeking in rats and monkeys 1, 2. Reinstatement procedures have since been modified to study the role of environmental stimuli, including drug-associated cues and exposure to various forms of stress, in relapse to drug seeking 1, 3, 4.
Over the past 15 years, a major focus of the reinstatement literature has been on the role of stress in drug relapse. One of the most commonly used forms of stress for studying this relationship is acute exposures to mild, intermittent, electric footshocks. The ability of footshock stress to induce reinstatement of drug seeking was originally demonstrated by Shaham and colleagues (1995) in rats with a history of intravenous heroin SA5. Subsequently, the effect was generalized to rats with histories of intravenous cocaine, methamphetamine, and nicotine SA, as well as oral ethanol SA 3, 6.
Although footshock-induced reinstatement of drug seeking can be achieved reliably and robustly, it is an effect that tends to be sensitive to certain parametrical variables. These include the arrangement of extinction and reinstatement test sessions, the intensity and duration of footshock stress, and the presence of drug-associated cues during extinction and testing for reinstatement. Here we present a protocol for footshock-induced reinstatement of cocaine seeking that we have used with consistent success to study the relationship between stress and cocaine seeking.

Animal models of relapse, known as reinstatement procedures, have been used extensively to study the role of stress in relapse to drug seeking. Here, we report on a method for inducing the reinstatement of cocaine seeking in laboratory rats via acute exposures to mild, intermittent electric footshock.

Ein Verfahren zur Untersuchung der Fußschock-Induced Wiedereinsetzung von Kokain suche in Laborratten

The most insidious aspect of drug addiction is the high propensity for relapse.  Animal models of relapse, known as reinstatement procedures, have been ...

Forschung

Neurowissenschaften

Multiple-mouse Neuroanatomical Magnetic Resonance Imaging

The field of mouse phenotyping with magnetic resonance imaging (MRI) is rapidly growing, motivated by the need for improved tools for characterizing and evaluating mouse models of human disease. MRI is an excellent modality for investigating genetically altered animals. It is capable of whole brain coverage, can be used in vivo, and provides multiple contrast mechanisms for investigating different aspects of neuranatomy and physiology. The advent of high-field scanners along with the ability to scan multiple mice simultaneously allows for rapid phenotyping of novel mutations.
Effective mouse MRI studies require attention to many aspects of experiment design. In this article, we will describe general methods to acquire quality images for mouse phenotyping using a system that images mice concurrently in shielded transmit/receive radio frequency (RF) coils in a common magnet (Bock et al., 2003). We focus particularly on anatomical phenotyping, an important and accessible application that has shown a high potential for impact in many mouse models at our imaging centre. Before we can provide the detailed steps to acquire such images, there are important practical considerations for both in vivo brain imaging (Dazai et al., 2004) and ex vivo brain imaging (Spring et al., 2007) that should be noted. These are discussed below.

Magnetic resonance imaging (MRI) has become an increasingly popular tool for examining the phenotype of genetically altered mice. This article illustrates the methods necessary to achieve high-throughput phenotyping of genetically altered mice using multiple-mouse MRI.

Multiple-Maus Neuroanatomische Magnetic Resonance Imaging

The field of mouse phenotyping with magnetic resonance imaging (MRI) is rapidly growing, motivated by the need for improved tools for characterizing and ...

Detection of Neuritic Plaques in Alzheimer's Disease Mouse Model

Alzheimer's disease (AD) is the most common neurodegenerative disorder leading to dementia. Neuritic plaque formation is one of the pathological hallmarks of Alzheimer's disease. The central component of neuritic plaques is a small filamentous protein called amyloid &beta; protein (A&beta;)1, which is derived from sequential proteolytic cleavage of the beta-amyloid precursor protein (APP) by &beta;-secretase and &gamma;-secretase. The amyloid hypothesis entails that A&gamma;-containing plaques as the underlying toxic mechanism in AD pathology2. The postmortem analysis of the presence of neuritic plaque confirms the diagnosis of AD. To further our understanding of A&gamma; neurobiology in AD pathogenesis, various mouse strains expressing AD-related mutations in the human APP genes were generated. Depending on the severity of the disease, these mice will develop neuritic plaques at different ages. These mice serve as invaluable tools for studying the pathogenesis and drug development that could affect the APP processing pathway and neuritic plaque formation. In this protocol, we employ an immunohistochemical method for specific detection of neuritic plaques in AD model mice. We will specifically discuss the preparation from extracting the half brain, paraformaldehyde fixation, cryosectioning, and two methods to detect neurotic plaques in AD transgenic mice: immunohistochemical detection using the ABC and DAB method and fluorescent detection using thiofalvin S staining method.

Detection of Neuritic Plaques in Alzheimer&#039;s Disease Mouse Model

One of the pathological characteristics of AD is the formation of Amyloid &#x03B2; protein positive neuritic plaques. In this protocol we describe two methods to detect neuritic plaques in transgenic AD model mice: immunohistochemical detection using the ABC and DAB method and fluorescent detection using thioflavin S staining method.

Nachweis von neuritischen Plaques bei Alzheimer-Maus-Modell

Alzheimer's disease (AD) is the most common neurodegenerative disorder leading to dementia. Neuritic plaque formation is one of the pathological hallmarks ...

The Mouse Forced Swim Test

The forced swim test is a rodent behavioral test used for evaluation of antidepressant drugs, antidepressant efficacy of new compounds, and experimental manipulations that are aimed at rendering or preventing depressive-like states. Mice are placed in an inescapable transparent tank that is filled with water and their escape related mobility behavior is measured. The forced swim test is straightforward to conduct reliably and it requires minimal specialized equipment. Successful implementation of the forced swim test requires adherence to certain procedural details and minimization of unwarranted stress to the mice. In the protocol description and the accompanying video, we explain how to conduct the mouse version of this test with emphasis on potential pitfalls that may be detrimental to interpretation of results and how to avoid them. Additionally, we explain how the behaviors manifested in the test are assessed.

The forced swim test is validated as an experimental approach to assess potential antidepressant efficacy in rodents. Experimental animals are placed in a tank of water and escape-related mobility behavior is quantified. The common procedures for the mouse version of this test are described.

Die Maus Forced Swim-Test

The forced swim test is a rodent behavioral test used for evaluation of antidepressant drugs, antidepressant efficacy of new compounds, and experimental ...

Microdialysis of Ethanol During Operant Ethanol Self-administration and Ethanol Determination by Gas Chromatography

Operant self-administration methods are commonly used to study the behavioral and pharmacological effects of many drugs of abuse, including ethanol. However, ethanol is typically self-administered orally, rather than intravenously like many other drugs of abuse. The pharmacokinetics of orally administered drugs are more complex than intravenously administered drugs. Because understanding the relationship between the pharmacological and behavioral effects of ethanol requires knowledge of the time course of ethanol reaching the brain during and after drinking, we use in vivo microdialysis and gas chromatography with flame ionization detection to monitor brain dialysate ethanol concentrations over time. 
Combined microdialysis-behavioral experiments involve the use of several techniques. In this article, stereotaxic surgery, behavioral training and microdialysis, which can be adapted to test a multitude of self-administration and neurochemical centered hypotheses, are included only to illustrate how they relate to the subsequent phases of sample collection and dialysate ethanol analysis. Dialysate ethanol concentration analysis via gas chromatography with flame-ionization detection, which is specific to ethanol studies, is described in detail. Data produced by these methods reveal the pattern of ethanol reaching the brain during the self-administration procedure, and when paired with neurochemical analysis of the same dialysate samples, allows conclusions to be made regarding the pharmacological and behavioral effects of ethanol.

A method to determine the time course of ethanol concentration in the brains of rats during operant ethanol self-administration is described. Gas chromatography with flame ionization detection is used to quantify ethanol in the dialysate samples, because it has the sensitivity required for the small volumes that are generated.

Microdialysis Ethanol während operante Ethanol Selbstverwaltung und Ethanol Bestimmung durch Gaschromatographie

Operant self-administration methods are commonly used to study the behavioral and pharmacological effects of many drugs of abuse, including ethanol.  ...

A Simple Way to Measure Alterations in Reward-seeking Behavior Using Drosophila melanogaster

We describe a protocol for measuring ethanol self-administration in fruit flies (Drosophila melanogaster) as a proxy for changes in reward states. We demonstrate a simple way to tap into the fly reward system, modify experiences related to natural reward, and use voluntary ethanol consumption as a measure for changes in reward states. The approach serves as a relevant tool to study the neurons and genes that play a role in experience-mediated changes of internal state. The protocol is composed of two discrete parts: exposing the flies to rewarding and nonrewarding experiences, and assaying voluntary ethanol consumption as a measure of the motivation to obtain a drug reward. The two parts can be used independently to induce the modulation of experience as an initial step for further downstream assays or as an independent two-choice feeding assay, respectively. The protocol does not require a complicated setup and can therefore be applied in any laboratory with basic fly culture tools.

A Simple Way to Measure Alterations in Reward-seeking Behavior Using Drosophila melanogaster

We describe a protocol for inducing rewarding and nonrewarding experiences in fruit flies (Drosophila melanogaster) using voluntary ethanol consumption as a measure for changes in reward states.

Ein einfacher Weg zu messen Veränderungen in Reward-seeking Verhalten verwenden<em&gt; Drosophila melanogaster</em

We describe a protocol for measuring ethanol self-administration in fruit flies (Drosophila melanogaster) as a proxy for changes in reward states. We ...

Operant Protocols for Assessing the Cost-benefit Analysis During Reinforced Decision Making by Rodents

Reinforcement-guided decision making is the ability to choose between competing courses of action based on the relative value of the benefits and their consequences. This process is integral to the normal human behavior and has been shown to be disrupted by neurological and psychiatric disorders such as addiction, schizophrenia, and depression. Rodents have long been used to uncover the neurobiology of human cognition. To this end, several behavioral tasks have been developed; however, most are non-automated and are labor-intensive. The recent development of the open-source microcontroller has enabled researchers to automate operant-based tasks for assessing a variety of cognitive tasks, standardizing the stimulus presentation, improving the data recording and consequently, improving the research output. Here, we describe an automated delay-based reinforcement-guided decision-making task, using an operant T-maze controlled by custom-written software programs. Using these decision-making tasks, we show the changes in the local field potential activities in the anterior cingulate cortex of a rat whilst it performs a delay-based cost-and-benefit decision-making task.

A cost-benefit analysis is a weighing-scale approach that the brain performs during the course of decision making. Here, we propose a protocol to train rats on an operant-based decision-making paradigm where rats choose higher rewards at the expense of waiting for 15 s to receive them.

Operant Protokolle für die Beurteilung der Kosten / Nutzen-Analyse während verstärkte Entscheidungsfindung durch Nagetiere

Reinforcement-guided decision making is the ability to choose between competing courses of action based on the relative value of the benefits and their ...

Transpupillary Two-Photon In Vivo Imaging of the Mouse Retina

The retina transforms light signals from the environment into electrical signals that are propagated to the brain. Diseases of the retina are prevalent and cause visual impairment and blindness. Understanding how such diseases progress is critical to formulating new treatments. In vivo&#160;microscopy in animal models of disease is a powerful tool for understanding neurodegeneration and has led to important progress towards treatments of conditions ranging from Alzheimer&#39;s disease to stroke. Given that the retina is the only central nervous system structure inherently accessible by optical approaches, it naturally lends itself towards in vivo imaging. However, the native optics of the lens and cornea present some challenges for effective imaging access.
This protocol outlines methods for in vivo two-photon imaging of cellular cohorts and structures in the mouse retina at cellular resolution, applicable for both acute- and chronic-duration imaging experiments. It presents examples of retinal ganglion cell (RGC), amacrine cell, microglial, and vascular imaging using a suite of labeling techniques including adeno-associated virus (AAV) vectors, transgenic mice, and inorganic dyes. Importantly, these techniques extend to all cell types of the retina, and suggested methods for accessing other cellular populations of interest are described. Also detailed are example strategies for manual image postprocessing for display and quantification. These techniques are directly applicable to studies of retinal function in health and disease.

In vivo imaging is a powerful tool for the study of biology in health and disease. This protocol describes transpupillary imaging of the mouse retina with a standard two-photon microscope. It also demonstrates different in vivoimaging methods to fluorescently label multiple cellular cohorts of the retina.

Transpupille Zwei-Photonen-In-vivo-Bildgebung der Netzhaut der Maus

The retina transforms light signals from the environment into electrical signals that are propagated to the brain. Diseases of the retina are prevalent ...

In vivo Calcium Imaging in Mouse Inferior Olive

Inferior olive (IO), a nucleus in the ventral medulla, is the only source of climbing fibers that form one of the two input pathways entering the cerebellum. IO has long been proposed to be crucial for motor control and its activity is currently considered to be at the center of many hypotheses of both motor and cognitive functions of the cerebellum. While its physiology and function have been relatively well studied on single-cell level in vitro, presently there are no reports on the organization of the IO network activity in living animals. This is largely due to the extremely challenging anatomical location of the IO, making it difficult to subject to conventional fluorescent imaging methods, where an optic path must be created through the entire brain located dorsally to the region of interest.
Here we describe an alternative method for obtaining state-of-the-art -level calcium imaging data from the IO network. The method takes advantage of the extreme ventral location of the IO and involves a surgical procedure for inserting a gradient-refractive index (GRIN) lens through the neck viscera to come into contact with the ventral surface of the calcium sensor GCaMP6s-expressing IO in anesthetized mice. A representative calcium imaging recording is shown to demonstrate the feasibility to record IO neuron activity after the surgery. While this is a non-survival surgery and the recordings must be conducted under anesthesia, it avoids damage to life-critical brainstem nuclei and allows conducting large variety of experiments investigating spatiotemporal activity patterns and input integration in the IO. This procedure with modifications could be used for recordings in other, adjacent regions of the ventral brainstem.

In vivo Calcium Imaging in Mouse Inferior Olive

We present a protocol to expose the brainstem of adult mouse from the ventral side. By using a gradient-refractive index lens with a miniature microscope, calcium imaging can be used to examine the activity of inferior olive neural somata in vivo.

In vivo Calcium Imaging in Maus Inferior Olive

Inferior olive (IO), a nucleus in the ventral medulla, is the only source of climbing fibers that form one of the two input pathways entering the ...

Using Optogenetics to Reverse Neuroplasticity and Inhibit Cocaine Seeking in Rats

This protocol demonstrates the steps needed to use optogenetic tools to reverse cocaine-induced plasticity at thalamo-amygdala circuits to reduce subsequent cocaine seeking behaviors in the rat. In our research, we had found that when rats self-administer intravenous cocaine paired with an audiovisual cue, synapses formed at inputs from the medial geniculate nucleus of the thalamus (MGN) onto principal neurons of the lateral amygdala (LA) become stronger as the cue-cocaine association is learned. We hypothesized that reversal of the cocaine-induced plasticity at these synapses would reduce cue-motivated cocaine seeking behavior. In order to accomplish this type of neuromodulation in vivo, we wanted to induce synaptic long-term depression (LTD), which decreases the strength of MGN-LA synapses. To this end, we used optogenetics, which allows neuromodulation of brain circuits using light. The excitatory opsin oChiEF was expressed on presynaptic MGN terminals in the LA by infusing an AAV containing oChiEF into the MGN. Optical fibers were then implanted in the LA and 473 nm laser light was pulsed at a frequency of 1 Hz for 15 minutes to induce LTD and reverse cocaine induced plasticity. This manipulation produces a long-lasting reduction in the ability of cues associated with cocaine to induce drug seeking actions.

The methods described here outline a procedure used to optogenetically reverse cocaine-induced plasticity in a behaviorally-relevant circuit in rats. Sustained low-frequency optical stimulation of thalamo-amygdala synapses induces long-term depression (LTD). In vivo optogenetically-induced LTD in cocaine-experienced rats resulted in the subsequent attenuation of cue-motivated drug seeking.