1. Takip Mikroskop Açıklaması <ol><li> Bir agar bir fiber ışık kaynağı tarafından aydınlatılır ve bir kamera ile görüntülenir. Bu sistem, X, Y çeviri aşama için monte edilir. </li><li> Sahne bir step motor denetleyicisine bağlı olan standart step motorları tarafından taşınır. </li><li> Denetleyici ve kamera bilgisayara bağlı ve LabVIEW yazılmış özel programlar tarafından kontrol edilir. </li><li> Kamera görüntüleri bir agar plaka yüzey ve hafif bir arka plan üzerine koyu nesneleri tanımlar. </li><li> Bilgisayar programı gerçek zamanlı olarak herhangi bir nesne ölçmek böylece görüntü kalitesi ayarlanır. Kazanç, parlaklık ve kameranın çekim hızı beyaz bir arka plan üzerinde koyu bir nesne sağlamak için ayarlanabilir. </li><li> Otomatik kalibrasyon işlemi için bir kalibrasyon işareti bir solucan kıracağıyla agar yüzeyini alay tarafından yapılır. </li><li> Izleme programı tarafından kullanılan filtre, ikili resmi kontrol edilebilir. </li><li> Öylesineftware bir test nesne sabit bir mesafe hareket ettirerek kalibrasyon matrisi hesaplayan otomatik kalibrasyon özelliğine sahiptir. </li><li> Piksel Mesafeler kalibrasyon matrisi step motor tarafından atılan adımların kalibre edilmektedir. </li><li> Kalibrasyon sonra sistem gitmek için hazır olduğunu ve büyütme değiştirilmediği sürece veya kameranın yönü değiştirilmiş ise yeniden kalibre edilmesi gerekmez. </li></ol> 2. Takip Tabaklar ve C. hazırlanması Takip için elegans <ol><li> Bir bakır halka solucanlar ağıl ve plakasının kenar geçme onları tutmak için kullanılır. Bakır, yerel bir kimyasal bir engel oluşturur ve deney (&lt;1 saat) süreleri için başka solucan hareket etkilemez. Bir ısı bloğu veya eşdeğer yerleştirerek ilk halkası ısıtın. </li><li> Taze bir agar plakası üzerine il halkası (% 1.7 Bacto Agar,% 0.25 &#39;lik Bacto-pepton,% 0.3 NaCl, 1 mM CaCl2, 1 mM MgSO4, 25 mM potasyum fosfat tamponu, 5 ug / mlkolesterol) ve agar yüzeyinden içine gömmek için hafifçe bastırın. </li><li> Yemek artıklarını onları yıkamak için bazı NGM tamponu (% 0.3 NaCl, 1 mM CaCl2, 1 mM MgSO4, 25 mM potasyum fosfat tamponu) ile dolu bir agar plaka üzerine L4 evre veya genç erişkin solucanlar seçin. Solucanlar birkaç dakika yüzmek edelim. </li><li> Dikkatle halkanın merkezine yakın izleme plaka üzerine tek bir solucan yerleştirin. Ve sonra solucanı izci üzerine plakası yerleştirin. </li></ol> 3. Solucan Takibi <ol><li> LabVIEW programı çalıştırın ve gerekirse (görüntüler için konum, resimler, ölçümler, kamera ayarları türleri) seçeneklerini belirleyin. </li><li> Joystick solucanın bir görüntü kadar mikroskop hareket kullanarak görüş alanı (bilgisayar ekranında) bulunmaktadır. Izleme program yapmaya &quot;parça&quot; tuşuna basın. </li><li> Bilgisayar programı aslında görüldüğü gibi bir ikili filtrelenen görüntüleri hareketlerini ölçer ve gerçek zamanlı olarak bu görüntü üzerinde ölçümler yapabilir </li><li> Kıçtasolucanı lokal şekil değişiklikleri ayrıntılı olarak görülebilir ve küresel yörünge bir yeniden izleme er, kademeli motor hareketlerine yapılabilir. </li></ol> 4. Veri Analizi <ol><li> Solucanın şekilleri parametreleştirmek skeletonizing betik (MATLAB) çalıştırın. (Şekil 2) </li><li> Iskeletize veri eigenmodes hesaplayın. (Şekil 3,4) </li><li> Şekil 5 göster. Şekildeki açıklayıcı veya temsilci sonuçları okuyun. </li></ol>

<ol>
	<li>Brenner, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+genetics+of+Caenorhabditis+elegans.">The genetics of Caenorhabditis elegans.</a> Genetics. 77 (1), 71-79 (1974).</li><li>de Bono, M., Maricq, A. V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Neuronal+substrates+of+complex+behaviors+in+C.+elegans.">Neuronal substrates of complex behaviors in C. elegans.</a> Annu. Rev. Neurosci. (28), 451-501 (2005).</li><li>Pierce-Shimomura, J. T., Morse, T. M., Lockery, S. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+fundamental+role+of+pirouettes+in+Caenorhabditis+elegans+chemotaxis.">The fundamental role of pirouettes in Caenorhabditis elegans chemotaxis.</a> J. Neurosci. 19 (21), 9557-9569 (1999).</li><li>Gray, J. M., Hill, J. J., Bargmann, C. I. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+circuit+for+navigation+in+Caenorhabditis+elegans.">A circuit for navigation in Caenorhabditis elegans.</a> Proc. Natl. Acad. Sci. U.S.A. 102 (9), 3184-3191 (2005).</li><li>Baek, J. H., Cosman, P., Feng, Z., Silver, J., Schafer, W. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Using+machine+vision+to+analyze+and+classify+Caenorhabditis+elegans+behavioral+phenotypes+quantitatively.">Using machine vision to analyze and classify Caenorhabditis elegans behavioral phenotypes quantitatively.</a> J. Neurosci. Methods. 118 (1), 9-21 (2002).</li><li>Stephens, G. J., Johnson-Kerner, B., Bialek, W., Ryu, W. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Dimensionality+and+Dynamics+in+the+Behavior+of+C.+elegans.">Dimensionality and Dynamics in the Behavior of C. elegans.</a> PLoS Comput. Biol. 4 (1), e1000028 (2008).</li><li>Stephens, G. J., Johnson-Kerner, B., Bialek, W., Ryu, W. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=From+modes+to+movement+in+the+behavior+of+C.+elegans.">From modes to movement in the behavior of C. elegans.</a> PLoS One. 5 (11), e13914 (2010).</li><li>Feng, Z., Cronin, C. J., Wittig, J. H., Sternberg, P. W., Schafer, W. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=An+imaging+system+for+standardized+quantitative+analysis+of+C.+elegans+behavior.">An imaging system for standardized quantitative analysis of C. elegans behavior.</a> BMC Bioinformatics. (5), 115 (2004).</li><li>Ramot, D., Johnson, B. E., Berry, T. L., Carnell, L., Goodman, M. B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+Parallel+Worm+Tracker:+A+Platform+for+Measuring+Average+Speed+and+Drug-Induced+Paralysis+in+Nematodes.">The Parallel Worm Tracker: A Platform for Measuring Average Speed and Drug-Induced Paralysis in Nematodes.</a> PLoS One. 3 (5), e2208 (2008).</li><li>Swierczek, N. A., Giles, A. C., Rankin, C. H., Kerr, R. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=High-throughput+behavioral+analysis+in+C.+elegans.">High-throughput behavioral analysis in C. elegans.</a> Nat. Methods. 8 (7), 592-598 (2011).</li><li>Leifer, A. M., Fang-Yen, C., Gershow, M., Alkema, M. J., Samuel, A. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Optogenetic+manipulation+of+neural+activity+in+freely+moving+Caenorhabditis+elegans.">Optogenetic manipulation of neural activity in freely moving Caenorhabditis elegans.</a> Nat. Methods. 8 (2), 147-152 (2011).</li><li>Stirman, J. N., Crane, M. M., Husson, S. J., Wabnig, S., Schultheis, C., Gottschalk, A., Lu, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Real-time+multimodal+optical+control+of+neurons+and+muscles+in+freely+behaving+Caenorhabditis+elegans.">Real-time multimodal optical control of neurons and muscles in freely behaving Caenorhabditis elegans.</a> Nat. Methods. 8 (2), 153-158 (2011).</li><li>Ben Arous, J., Tanizawa, Y., Rabinowitch, I., Chatenay, D., Schafer, W. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Automated+imaging+of+neuronal+activity+in+freely+behaving+Caenorhabditis+elegans.">Automated imaging of neuronal activity in freely behaving Caenorhabditis elegans.</a> J Neurosci Methods. 187 (2), 229-234 (2010).</li><li>Wittenburg, N., Baumeister, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Thermal+avoidance+in+Caenorhabditis+elegans:+an+approach+to+the+study+of+nociception.">Thermal avoidance in Caenorhabditis elegans: an approach to the study of nociception.</a> Proc. Natl. Acad. Sci. U.S.A. 96 (18), 10477-10482 (1999).</li></ol>

Çıkar çatışması ilan etti.

Lokomosyon ve doğal davranış çalışmada veri azaltma teknikleri ile ortak non-invazif izleme teknikleri gerektirir. Burada C. detaylı görüntülerini kaydeden izleme sistemi kullanımı kolay göstermiştir bir agar plaka yüzeyi üzerinde tarama gibi elegans davranış. Bu görüntülerin içerdiği bilgi miktarı büyük ve yüksek boyutlu olduğunu ve bu yüzden de sadece dört temel tedbirleri içine veri boyutluluğu azaltmak için yöntemler geliştirmişlerdir. Bu önlemler kapsamlı ve s...

<table border="1"><tbody><tr><td> Kısım Adı </td><td> Şirket </td><td> Katalog numarası </td><td> Yorumlar (isteğe bağlı) </td></tr><tr><td> CCD kamera </td><td> Basler </td><td> A601f </td><td></td></tr><tr><td> Lens </td><td> Edmund Optik </td><td> MMS serisi </td><td></td></tr><tr><td> Fiber Aydınlatma </td><td> Dolan Jenner </td><td> DC-950H </td><td></td></tr><tr><td> Çeviri aşamasında </td><td> Deltron </td><td> LS3-4 </td><td></td></tr><tr><td> Step Motor </td><td> ABD dijital </td><td> MS23C </td><td></td></tr><tr><td> Step motor sürücü </td><td> Geko </td><td> G201 </td><td></td></tr><tr><td> Adım motor kontrolü </td><td> SimpleStep </td><td> SSXYZ </td><td></td></tr><tr><td></td><td></td><td></td><td> Tüm programlama kodu kullanılabilir. Yazara bir istek e-posta gönderin. </td></tr></tbody></table>

c. elegans tracking and behavioral measurement

Biz C. lokomotor davranışları ölçmek için enstrümantasyon, görüntü işleme ve veri analiz teknikleri geliştirdiler elegans bir agar plaka yüzeyi üzerinde tarama gibi. Davranış, C. genetik, biyokimyasal ve nöronal temelini çalışma için Bu mikroskop mükellef, genetik uysal ve taksiler, öğrenme ve sosyal etkileşim 1,2 dahil olmak üzere karmaşık davranışlar, bir dizi gösterir çünkü elegans ideal bir organizmadır. Onlar agar plaklarına sürün solucanlar hareketleri izlemeye dayalı Davranış analizi duyusal davranışları 3, lokomosyon 4, ve genel mutasyonel fenotipleme 5 çalışmada özellikle yararlıdır olmuştur. Sistemimiz solucanlar hiçbir mekanik uyarana solucan iletilir sağlayan sabit bir agar plaka üzerinde taradığı gibi kamera ve aydınlatma sistemi hareket ettirerek çalışır. Bizim izleme sistemi kullanımı kolay ve yarı-otomatik kalibrasyon özelliği içerir. Bir chatüm video izleme sistemlerinin llenge bunu boyutlu özünde yüksek veri büyük miktarda üretir olmasıdır. Bizim görüntü işleme ve veri analiz programlarının kapsamlı sadece 3-4 boyutları 6,7 fonksiyonu olarak solucanlar davranışı yeniden bağımsız bileşenler, bir dizi içine solucan şekli azaltarak bu meydan başa. Işleminin bir örnek olarak, sonsuz dişli bir faz özel bir şekilde onun ters durumuna girer ve çıkar olduğunu göstermektedir.

Örnek: yem, C. elegans geçişler ileriden genellikle ileri hareket durumuna dönmeden önce bir uyarlanmasını (omega dönüş) gerçekleştirirken, hareket ters. Bu geçiş nicel hareket toplayıcılık desen anlamak ve aynı zamanda solucan motor kontrolü önemlidir. Lokomosyon davranış ince ayrıntılarını ortaya çıkarmak için güç bizim izci cihaz kullanılarak görülebilir. Bir örnek olarak ters ve ~ 30 dakika agar plaka üzerinde serbestçe sürünerek solucanlar...

Watch this Scientific Journal Video about C. elegans Tracking and Behavioral Measurement at JoVE.com

C. elegans Tracking and Behavioral Measurement

Biz kayıt ve sayısal bir video-hızı izleme mikroskop sistemi geliştirdik<em&gt; C. elegans</emYüksek çözünürlüklü ve yüksek hızlarda&gt; davranışı. Biz de tamamen solucanın şeklini tanımlayan ölçümleri temel bir dizi solucan görüntülerin boyutluluğu azaltmak için hesaplamalı yöntemler geliştirmişlerdir.

C. elegans Takip ve Davranış Ölçme

We have developed instrumentation, image processing, and data analysis techniques to quantify the locomotory behavior of C. elegans as it crawls on the ...

c-elegans-tracking-and-behavioral-measurement

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Neuroscience

C. elegans Tracking and Behavioral Measurement

19.0K Görüntüleme.  University of Toronto. Biz kayıt ve sayısal bir video-hızı izleme mikroskop sistemi geliştirdik C. elegans davranışı. Biz de tamamen solucanın şeklini tanımlayan ölçümleri temel bir dizi solucan görüntülerin boyutluluğu azaltmak için hesaplamalı yöntemler geliştirmişlerdir.

Video: C. elegans Tracking and Behavioral Measurement

Assaying &beta;-amyloid Toxicity using a Transgenic C. elegans Model

Accumulation of the &beta;-amyloid peptide (A&beta;) is generally believed to be central to the induction of Alzheimer's disease, but the relevant mechanism(s) of toxicity are still unclear. A&beta; is also deposited intramuscularly in Inclusion Body Myositis, a severe human myopathy. The intensely studied nematode worm Caenorhabditis elegans can be transgenically engineered to express human A&beta;. Depending on the tissue or timing of A&beta; expression, transgenic worms can have readily measurable phenotypes that serve as a read-out of A&beta; toxicity. For example, transgenic worms with pan-neuronal A&beta; expression have defects is associative learning (Dosanjh et al. 2009), while transgenic worms with constitutive muscle-specific expression show a progressive, age-dependent paralysis phenotype (Link, 1995; Cohen et al. 2006). One particularly useful C. elegans model employs a temperature-sensitive mutation in the mRNA surveillance system to engineer temperature-inducible muscle expression of an A&beta; transgene, resulting in a reproducible paralysis phenotype upon temperature upshift (Link et al. 2003). Treatments that counter A&beta; toxicity in this model [e.g., expression of a protective transgene (Hassan et al. 2009) or exposure to Ginkgo biloba extracts (Wu et al. 2006)] reproducibly alter the rate of paralysis induced by temperature upshift of these transgenic worms. Here we describe our protocol for measuring the rate of paralysis in this transgenic C. elegans model, with particular attention to experimental variables that can influence this measurement.

Assaying &#946;-amyloid Toxicity using a Transgenic C. elegans Model

The intensely studied nematode worm Caenorhabditis elegans can be transgenically engineered to express the human &beta;-amyloid peptide (A&beta;). Induced expression of A&beta; in C. elegans muscle leads to a rapid, reproducible paralysis phenotype that can be used to monitor treatments that modulate A&beta; toxicity.

Transgenik kullanarak Assaying β-amiloid Toksisite C. elegans Model

Accumulation of the &beta;-amyloid peptide (A&beta;) is generally believed to be central to the induction of Alzheimer's disease, but the relevant ...

Nörobilim

C. elegans Positive Butanone Learning, Short-term, and Long-term Associative Memory Assays

The memory of experiences and learned information is critical for organisms to make choices that aid their survival. C. elegans navigates its environment through neuron-specific detection of food and chemical odors1, 2, and can associate nutritive states with chemical odors3, temperature4, and the pathogenicity of a food source5.
Here, we describe assays of C. elegans associative learning and short- and long-term associative memory. We modified an aversive olfactory learning paradigm6 to instead produce a positive response; the assay involves starving ~400 worms, then feeding the worms in the presence of the AWC neuron-sensed volatile chemoattractant butanone at a concentration that elicits a low chemotactic index (similar to Toroyama et al.7). A standard population chemotaxis assay1 tests the worms' attraction to the odorant immediately or minutes to hours after conditioning.
After conditioning, wild-type animals' chemotaxis to butanone increases ~0.6 Chemotaxis Index units, its "Learning Index". Associative learning is dependent on the presence of both food and butanone during training. Pairing food and butanone for a single conditioning period ("massed training") produces short-term associative memory that lasts ~2 hours. Multiple conditioning periods with rest periods between ("spaced training") yields long-term associative memory (&lt;40 hours), and is dependent on the cAMP Response Element Binding protein (CREB),6 a transcription factor required for long-term memory across species.8
Our protocol also includes image analysis methods for quick and accurate determination of chemotaxis indices. High-contrast images of animals on chemotaxis assay plates are captured and analyzed by worm counting software in MatLab. The software corrects for uneven background using a morphological tophat transformation.9 Otsu's method is then used to determine a threshold to separate worms from the background.10 Very small particles are removed automatically and larger non-worm regions (plate edges or agar punches) are removed by manual selection. The software then estimates the size of single worm by ignoring regions that are above a specified maximum size and taking the median size of the remaining regions. The number of worms is then estimated by dividing the total area identified as occupied by worms by the estimated size of a single worm.
We have found that learning and short- and long-term memory can be distinguished, and that these processes share similar key molecules with higher organisms.6,8 Our assays can quickly test novel candidate genes or molecules that affect learning and short- or long-term memory in C. elegans that are relevant across species.

C. elegans Positive Butanone Learning, Short-term, and Long-term Associative Memory Assays

Here we describe methods to test C. elegans associative learning and short- and long-term associative memory. These population assays employ the worms abilities to chemotax toward volatile odorants, and form positive associations upon pairing food with the chemoattractant butanone. Increasing the number of conditioning periods induces long-term memory.

C. elegans Pozitif bütanon Öğrenme, Kısa vadeli ve uzun vadeli ilişkilendirilebilir Bellek Tahliller

The memory of experiences and learned information is critical for organisms to make choices that aid their survival. C. elegans navigates its environment ...

In vivo Laser Axotomy in C. elegans

Neurons communicate with other cells via axons and dendrites, slender membrane extensions that contain pre- or post-synaptic specializations. If a neuron is damaged by injury or disease, it may regenerate. Cell-intrinsic and extrinsic factors influence the ability of a neuron to regenerate and restore function. Recently, the nematode C. elegans has emerged as an excellent model organism to identify genes and signaling pathways that influence the regeneration of neurons1-6. The main way to initiate neuronal regeneration in C. elegans is laser-mediated cutting, or axotomy. During axotomy, a fluorescently-labeled neuronal process is severed using high-energy pulses. Initially, neuronal regeneration in C. elegans was examined using an amplified femtosecond laser5. However, subsequent regeneration studies have shown that a conventional pulsed laser can be used to accurately sever neurons in vivo and elicit a similar regenerative response1,3,7.
We present a protocol for performing in vivo laser axotomy in the worm using a MicroPoint pulsed laser, a turnkey system that is readily available and that has been widely used for targeted cell ablation. We describe aligning the laser, mounting the worms, cutting specific neurons, and assessing subsequent regeneration. The system provides the ability to cut large numbers of neurons in multiple worms during one experiment. Thus, laser axotomy as described herein is an efficient system for initiating and analyzing the process of regeneration.

In vivo Laser Axotomy in C. elegans

A protocol to cut neurons in C. elegans with a MicroPoint pulsed laser is presented. We describe setting up the system, immobilizing worms, and severing labeled neurons. Advantages include a relatively low-cost system and the ability to sever neuronal processes or ablate cells in vivo.

C in vivo Lazer Axotomy elegans

Neurons communicate with other cells via axons and dendrites, slender membrane extensions that contain pre- or post-synaptic specializations. If a neuron ...

Automated Quantification of Synaptic Fluorescence in C. elegans

Synapse strength refers to the amplitude of postsynaptic responses to presynaptic neurotransmitter release events, and has a major impact on overall neural circuit function. Synapse strength critically depends on the abundance of neurotransmitter receptors clustered at synaptic sites on the postsynaptic membrane. Receptor levels are established developmentally, and can be altered by receptor trafficking between surface-localized, subsynaptic, and intracellular pools, representing important mechanisms of synaptic plasticity and neuromodulation. Rigorous methods to quantify synaptically-localized neurotransmitter receptor abundance are essential to study synaptic development and plasticity. Fluorescence microscopy is an optimal approach because it preserves spatial information, distinguishing synaptic from non-synaptic pools, and discriminating among receptor populations localized to different types of synapses. The genetic model organism Caenorhabditis elegans is particularly well suited for these studies due to the small size and relative simplicity of its nervous system, its transparency, and the availability of powerful genetic techniques, allowing examination of native synapses in intact animals.
Here we present a method for quantifying fluorescently-labeled synaptic neurotransmitter receptors in C. elegans. Its key feature is the automated identification and analysis of individual synapses in three dimensions in multi-plane confocal microscope output files, tabulating position, volume, fluorescence intensity, and total fluorescence for each synapse. This approach has two principal advantages over manual analysis of z-plane projections of confocal data. First, because every plane of the confocal data set is included, no data are lost through z-plane projection, typically based on pixel intensity averages or maxima. Second, identification of synapses is automated, but can be inspected by the experimenter as the data analysis proceeds, allowing fast and accurate extraction of data from large numbers of synapses. Hundreds to thousands of synapses per sample can easily be obtained, producing large data sets to maximize statistical power. Considerations for preparing C. elegans for analysis, and performing confocal imaging to minimize variability between animals within treatment groups are also discussed. Although developed to analyze C. elegans postsynaptic receptors, this method is generally useful for any type of synaptically-localized protein, or indeed, any fluorescence signal that is localized to discrete clusters, puncta, or organelles.
The procedure is performed in three steps: 1) preparation of samples, 2) confocal imaging, and 3) image analysis. Steps 1 and 2 are specific to C. elegans, while step 3 is generally applicable to any punctate fluorescence signal in confocal micrographs.

Automated Quantification of Synaptic Fluorescence in C. elegans

The abundance of neurotransmitter receptors clustered at synapses strongly influences synaptic strength. This method quantifies fluorescently-labeled neurotransmitter receptors in three dimensions with single-synapse resolution in C. elegans, allowing hundreds of synapses to be rapidly characterized within a single sample without distortions introduced by z-plane projection.

Içinde Synaptic florasan Otomatik Sayısallaştırma<em&gt; C. elegans</em

Synapse strength refers to the amplitude of postsynaptic responses to presynaptic neurotransmitter release events, and has a major impact on overall ...

A Molecular Readout of Long-term Olfactory Adaptation in C. elegans

During sustained stimulation most sensory neurons will adapt their response by decreasing their sensitivity to the signal. The adaptation response helps shape attention and also protects cells from over-stimulation. Adaptation within the olfactory circuit of C. elegans was first described by Colbert and Bargmann1,2. Here, the authors defined parameters of the olfactory adaptation paradigm, which they used to design a genetic screen to isolate mutants defective in their ability to adapt to volatile odors sensed by the Amphid Wing cells type C (AWC) sensory neurons. When wildtype C. elegans animals are exposed to an attractive AWC-sensed odor3 for 30 min they will adapt their responsiveness to the odor and will then ignore the adapting odor in a chemotaxis behavioral assay for ~1 hr. When wildtype C. elegans animals are exposed to an attractive AWC-sensed odor for ~1 hr they will then ignore the adapting odor in a chemotaxis behavioral assay for ~3 hr. These two phases of olfactory adaptation in C. elegans were described as short-term olfactory adaptation (induced after 30 min odor exposure), and long-term olfactory adaptation (induced after 60 min odor exposure). Later work from L'Etoile et al.,4 uncovered a Protein Kinase G (PKG) called EGL-4 that is required for both the short-term and long-term olfactory adaptation in AWC neurons. The EGL-4 protein contains a nuclear localization sequence that is necessary for long-term olfactory adaptation responses but dispensable for short-term olfactory adaptation responses in the AWC4. By tagging EGL-4 with a green fluorescent protein, it was possible to visualize the localization of EGL-4 in the AWC during prolonged odor exposure. Using this fully functional GFP-tagged EGL-4 (GFP::EGL-4) molecule we have been able to develop a molecular readout of long-term olfactory adaptation in the AWC5. Using this molecular readout of olfactory adaptation we have been able to perform both forward and reverse genetic screens to identify mutant animals that exhibit defective subcellular localization patterns of GFP::EGL-4 in the AWC6,7. Here we describe: 1) the construction of GFP::EGL-4 expressing animals; 2) the protocol for cultivation of animals for long-term odor-induced nuclear translocation assays; and 3) the scoring of the long-term odor-induced nuclear translocation event and recovery (re-sensitization) from the nuclear GFP::EGL-4 state.

A Molecular Readout of Long-term Olfactory Adaptation in C. elegans

Here we describe a molecular readout of long-term olfactory adaptation in Caenorhabditis elegans. The Protein Kinase G, EGL-4, is necessary for stable adaptation responses in the primary sensory neuron pair called AWC. During prolonged odor exposure EGL-4 translocates from the cytosol to nucleus of the AWC.

Uzun vadeli Olfaktör İntibak A Moleküler Saati<em&gt; C. elegans</em

During sustained stimulation most sensory neurons will adapt their response by decreasing their sensitivity to the signal. The adaptation response helps ...

Hippocampal Insulin Microinjection and In vivo Microdialysis During Spatial Memory Testing

Glucose metabolism is a useful marker for local neural activity, forming the basis of methods such as 2-deoxyglucose and functional magnetic resonance imaging. However, use of such methods in animal models requires anesthesia and hence both alters the brain state and prevents behavioral measures. An alternative method is the use of in vivo microdialysis to take continuous measurement of brain extracellular fluid concentrations of glucose, lactate, and related metabolites in awake, unrestrained animals. This technique is especially useful when combined with tasks designed to rely on specific brain regions and/or acute pharmacological manipulation; for example, hippocampal measurements during a spatial working memory task (spontaneous alternation) show a dip in extracellular glucose and rise in lactate that are suggestive of enhanced glycolysis1-3,4-5, and intrahippocampal insulin administration both improves memory and increases hippocampal glycolysis6. Substances such as insulin can be delivered to the hippocampus via the same microdialysis probe used to measure metabolites. The use of spontaneous alternation as a measure of hippocampal function is designed to avoid any confound from stressful motivators (e.g. footshock), restraint, or rewards (e.g. food), all of which can alter both task performance and metabolism; this task also provides a measure of motor activity that permits control for nonspecific effects of treatment. Combined, these methods permit direct measurement of the neurochemical and metabolic variables regulating behavior.

Hippocampal Insulin Microinjection and In vivo Microdialysis During Spatial Memory Testing

Modulation of hippocampally-dependent spatial working memory by direct intrahippocampal microinjection, accompanied and followed by in vivo microdialysis for metabolites in conscious, behaving animals.

Hipokampal İnsülin Mikroenjeksiyon ve<em&gt; In vivo</emMekansal Bellek Test sırasında&gt; mikrodivaliz

Glucose metabolism is a useful marker for local neural activity, forming the basis of methods such as 2-deoxyglucose and functional magnetic resonance ...

A Method for High Fidelity Optogenetic Control of Individual Pyramidal Neurons In vivo

Optogenetic methods have emerged as a powerful tool for elucidating neural circuit activity underlying a diverse set of behaviors across a broad range of species. Optogenetic tools of microbial origin consist of light-sensitive membrane proteins that are able to activate (e.g., channelrhodopsin-2, ChR2) or silence (e.g., halorhodopsin, NpHR) neural activity ingenetically-defined cell types over behaviorally-relevant timescales. We first demonstrate a simple approach for adeno-associated virus-mediated delivery of ChR2 and NpHR transgenes to the dorsal subiculum and prelimbic region of the prefrontal cortex in rat. Because ChR2 and NpHR are genetically targetable, we describe the use of this technology to control the electrical activity of specific populations of neurons (i.e., pyramidal neurons) embedded in heterogeneous tissue with high temporal precision. We describe herein the hardware, custom software user interface, and procedures that allow for simultaneous light delivery and electrical recording from transduced pyramidal neurons in an anesthetized in vivo preparation. These light-responsive tools provide the opportunity for identifying the causal contributions of different cell types to information processing and behavior.

A Method for High Fidelity Optogenetic Control of Individual Pyramidal Neurons In vivo

The recent development of neuroscience tools that combine genetics and optics, termed "optogenetics", enables control over neural circuit activity with an unprecedented level of spatial and temporal resolution. Here we provide a protocol for integrating in vivo recording with optogenetic manipulation of genetically-defined subsets of prefrontal cortical and subicular pyramidal neurons.

Bireysel piramidal nöronlar High Fidelity optogenetic Kontrolü için Bir Yöntem<em&gt; In vivo</em

Optogenetic methods  have emerged as a powerful tool for elucidating neural circuit activity  underlying a diverse set of behaviors across a broad range ...

In vivo Neuronal Calcium Imaging in C. elegans

The nematode worm C. elegans is an ideal model organism for relatively simple, low cost neuronal imaging in vivo. Its small transparent body and simple, well-characterized nervous system allows identification and fluorescence imaging of any neuron within the intact animal. Simple immobilization techniques with minimal impact on the animal's physiology allow extended time-lapse imaging. The development of genetically-encoded calcium sensitive fluorophores such as cameleon 1 and GCaMP 2 allow in vivo imaging of neuronal calcium relating both cell physiology and neuronal activity. Numerous transgenic strains expressing these fluorophores in specific neurons are readily available or can be constructed using well-established techniques. Here, we describe detailed procedures for measuring calcium dynamics within a single neuron in vivo using both GCaMP and cameleon. We discuss advantages and disadvantages of both as well as various methods of sample preparation (animal immobilization) and image analysis. Finally, we present results from two experiments: 1) Using GCaMP to measure the sensory response of a specific neuron to an external electrical field and 2) Using cameleon to measure the physiological calcium response of a neuron to traumatic laser damage. Calcium imaging techniques such as these are used extensively in C. elegans and have been extended to measurements in freely moving animals, multiple neurons simultaneously and comparison across genetic backgrounds. C. elegans presents a robust and flexible system for in vivo neuronal imaging with advantages over other model systems in technical simplicity and cost.

In vivo Neuronal Calcium Imaging in C. elegans

With its small transparent body, well-documented neuroanatomy and a host of amenable genetic techniques and reagents, C. elegans makes an ideal model organism for in vivo neuronal imaging using relatively simple, low-cost techniques. Here we describe single neuron imaging within intact adult animals using genetically encoded fluorescent calcium indicators.

C. vivo Nöronal Kalsiyum Imaging&#39;de elegans

The nematode worm C. elegans is an ideal model organism  for relatively simple, low cost neuronal imaging in vivo. Its small transparent body and simple, ...

Long-term Behavioral Tracking of Freely Swimming Weakly Electric Fish

Long-term behavioral tracking can capture and quantify natural animal behaviors, including those occurring infrequently. Behaviors such as exploration and social interactions can be best studied by observing unrestrained, freely behaving animals. Weakly electric fish (WEF) display readily observable exploratory and social behaviors by emitting electric organ discharge (EOD). Here, we describe three effective techniques to synchronously measure the EOD, body position, and posture of a free-swimming WEF for an extended period of time. First, we describe the construction of an experimental tank inside of an isolation chamber designed to block external sources of sensory stimuli such as light, sound, and vibration. The aquarium was partitioned to accommodate four test specimens, and automated gates remotely control the animals&#39; access to the central arena. Second, we describe a precise and reliable real-time EOD timing measurement method from freely swimming WEF. Signal distortions caused by the animal&#39;s body movements are corrected by spatial averaging and temporal processing stages. Third, we describe an underwater near-infrared imaging setup to observe unperturbed nocturnal animal behaviors. Infrared light pulses were used to synchronize the timing between the video and the physiological signal over a long recording duration. Our automated tracking software measures the animal&#39;s body position and posture reliably in an aquatic scene. In combination, these techniques enable long term observation of spontaneous behavior of freely swimming weakly electric fish in a reliable and precise manner. We believe our method can be similarly applied to the study of other aquatic animals by relating their physiological signals with exploratory or social behaviors.

We describe a set of techniques for studying spontaneous behavior of freely swimming weakly electric fish over an extended period of time, by synchronously measuring the animal&#39;s electric organ discharge timing, body position and posture both accurately and reliably in a specially designed aquarium tank inside a sensory isolation chamber.

Serbestçe Yüzme Zayıf Elektrik Balık Uzun vadeli Davranış Takip

Long-term behavioral tracking can capture and quantify natural animal behaviors, including those occurring infrequently. Behaviors such as exploration and ...

Visualizing Neuroblast Cytokinesis During C. elegans Embryogenesis

This protocol describes the use of fluorescence microscopy to image dividing cells within developing Caenorhabditis elegans embryos. In particular, this protocol focuses on how to image dividing neuroblasts, which are found underneath the epidermal cells and may be important for epidermal morphogenesis. Tissue formation is crucial for metazoan development&#160;and relies on external cues from neighboring tissues. C. elegans is an excellent model organism to study tissue morphogenesis in vivo due to its transparency and simple organization, making its tissues easy to study via microscopy. Ventral enclosure is the process where the ventral surface of the embryo is covered by a single layer of epithelial cells. This event is thought to be facilitated by the underlying neuroblasts, which provide chemical guidance cues to mediate migration of the overlying epithelial cells. However, the neuroblasts are highly proliferative and also may act as a mechanical substrate for the ventral epidermal cells. Studies using this experimental protocol could uncover the importance of intercellular communication during tissue formation, and could be used to reveal the roles of genes involved in cell division within developing tissues.

Visualizing Neuroblast Cytokinesis During C. elegans Embryogenesis

This protocol describes how to image dividing cells within a tissue in Caenorhabditis elegans embryos. While several protocols describe how to image cell division in the early embryo, this protocol describes how to image cell division within a developing tissue during mid late embryogenesis.

Sırasında Neuroblast Sitokinez görselleştirme<em&gt; C. elegans</em&gt; Embriyo

This protocol describes the use of fluorescence microscopy to image dividing cells within developing Caenorhabditis elegans embryos. In particular, this ...