Biz Bernard Charroux tartışmalar için teşekkür ederiz. Bu çalışma KCL Biyomedikal Okulu tarafından finanse edildi.

1. Drosophila retina diseksiyonu <ol><li> Bir iyi bir 3-Well Cam Slayt doldurun fosfat tamponlu salin (PBS 1X) ve sonra CO 2 sinekler uyutmak. Hem erkekler hem de bu deney için kullanılabilir. </li><li> Sinekler anestezi sonra, forseps kullanarak tek bir sinek pick up ve PBS küçük bir çanak içine bırakın. </li><li> Diseksiyon kapsamında, forseps ile burnumun çimdik, ve daha sonra ikinci bir forseps kullanarak boyun kesilmesinin vücut baş ayırmak. </li><li> Sol / sağ orta hat beyin ortaya çıkarmak için microscissors sinek kafası boyunca yarıya, burnumun Holding sinek kafası. </li><li> Retina pick up ve iyi bir Schneider orta dolu 3-Well Cam Slide ikinci transfer için bir kesme pipet kullanın. </li><li> Birincisi, daha sonra uzakta kabuğu kafa manikür ve forseps ile beyin kaldırmak. Lamina ve kornea arasında sıkışmış retina tutun. </li><li> Sonra, retina taze Schnieder orta cam slayt doğrudan yerleştirilen bir damla (50 ul) üzerine aktarın. </li></ol> 2. Ommatidia diseksiyonu <ol><li> Diseksiyon (anında görüntü veya kültür olsun) nihai amacı ve floresan mikroskop (doğrudan ya da ters) optik olarak, bu adımı bir mikroskop lamı üzerine veya 24 plaka ya alabilir. Bu diseksiyon nihai amacı için, ommatidia cam slayt üzerine doğrudan disseke olacaktır. </li><li> Ya forseps ile retinanın en dorsal veya ventral sonuna kavrayın. Microscissors kullanarak, gözün ortasında ommatidia / dorsal ventral orta hat boyunca ortaya çıkarmak için yarım retina kesti. </li><li> Gibi retina, kornea aşağı bakacak ve lamina ile karşı karşıya olduğunu kavramak için devam edin. Ince bir tungsten iğne kullanılması, lamina ve kornea ommatidia ayırın. </li><li> Tek ommatidia ve ommatidia gruplar, iyi veya slayt alt toplayacaktır. Devam etmeden önce toplanan olabilecek herhangi bir büyük enkaz çıkarın. </li></ol> 3. Tedavi, boyama ve görüntüleme <ol><li> Otofaji analiz etmek, 1:1000 Schneider açılan Lysotracker (sonra ilk seyreltik Schneider 01:10 ve slayt açılan 0.5 ul), mix sulandırmak ve 10 saniye bekleyin. </li><li> Ommatidia geride bırakmak için dikkatli olmak, slayt aşırı sıvı çıkarın. Bu ince bir jel yükleme ucu ile yapılır. </li><li> Ommatidia kapağı için Vectashield bir damla, bir oje ile lamel ve mühür uygulanır. </li></ol> 4. Temsilcisi Sonuçlar: Protokol iyi yürütme lamina parçaları ile birlikte tutulur ama güzel kornea tarafta ayrılmış, tek ommatidia ve ommatidia küçük gruplar bir dizi bırakmalısınız. Autophagosomes, lizozomlar ve autophagolysosomes (Şekil 3) gösteren, GFP ve Lysotracker: Bu Atg8 görselleştirmek için bu örnekte olduğu gibi görüntülü olabilir. Bu yöntem, canlı görüntüleme için kullanılabilir, ancak bu durumda Schneider orta otofloresans düşük yoğunluklu floresan sinyalleri ayırt etmek zor olacağı not edilmelidir. Ek bir sorun fotoreseptörlerin bağlı kalır pigment granülleri yoğun floresan, özellikle kırmızı kanal olmasıdır. Bir aydınlık resim gerçek organelleri onları ayırmak için gerekli olabilir. <img src="/files/ftp_upload/2882/2882fig1.jpg" alt="Şekil 1"/> Şekil 1 sinek retina diseksiyonu işlem akış şeması, tek ommatidia veya küçük gruplar ommatidia elde etmek için . <img src="/files/ftp_upload/2882/2882fig2.jpg" alt="Şekil 2"/> Şekil 2 Burada basit bir protokol olası varyasyonları sinek genetik içerir ve 24 saat diseksiyonu ilaç yönetimi downstream diseksiyon ve boyama veya kültür yukarı yaşlanma olduğunu açıklar. <img src="/files/ftp_upload/2882/2882fig3.jpg" alt="Şekil 3"/> Şekil 3 Konfokal tarama aw disseke tek ommatidium autophagosomes ve lizozomlar; GMR-Gal4, UAS-Atro75QN; UAS-GFP:: Atg8 / + sinek poliglutamin Atrophin mutant ve yaşlı 12 gün ifade, 29 ° C Aydınlık paneli (sağ üstte) ommatidium neredeyse sağlam bir yapı gösterir ve çerçeve taranan bölgeyi gösterir. Iki organellerin füzyon sonucu kırmızı lekeler Lizozomlar, yeşil autophagosomes, oto-lizozomlar, sarı görünür. Ok autophagosomes ve lizozomlar arasında devam eden iki füzyon olayları göstermektedir.

<ol>
	<li>Marsh, J. L., Thompson, L. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Drosophila+in+the+study+of+neurodegenerative+disease.">Drosophila in the study of neurodegenerative disease.</a> Neuron. 52, 169-178 (2006).</li><li>Mizushima, N., Levine, B., Cuervo, A. M., Klionsky, D. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Autophagy+fights+disease+through+cellular+self-digestion.">Autophagy fights disease through cellular self-digestion.</a> Nature. 451, 1069-1075 (2008).</li><li>Nisoli, I. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Neurodegeneration+by+polyglutamine+Atrophin+is+not+rescued+by+induction+of+autophagy.">Neurodegeneration by polyglutamine Atrophin is not rescued by induction of autophagy.</a> Cell Death Differ. 17, 1577-1587 (2010).</li><li>Charroux, B., Fanto, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+fine+line+between+waste+disposal+and+recycling:+DRPLA+fly+models+illustrate+the+importance+of+completing+the+autophagy+cycle+for+rescuing+neurodegeneration.">The fine line between waste disposal and recycling: DRPLA fly models illustrate the importance of completing the autophagy cycle for rescuing neurodegeneration.</a> Autophagy. 6, 667-669 (2010).</li><li>Hardie, R. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Voltage-sensitive+potassium+channels+in+Drosophila+photoreceptors.">Voltage-sensitive potassium channels in Drosophila photoreceptors.</a> J Neurosci. 11, 3079-3095 (1991).</li><li>Lee, T., Luo, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mosaic+analysis+with+a+repressible+cell+marker+(MARCM)+for+Drosophila+neural+development.">Mosaic analysis with a repressible cell marker (MARCM) for Drosophila neural development.</a> Trends in neurosciences. 24, 251-254 (2001).</li><li>Xu, T., Rubin, G. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Analysis+of+genetic+mosaics+in+developing+and+adult+Drosophila+tissues.">Analysis of genetic mosaics in developing and adult Drosophila tissues.</a> Development. 117, 1223-1237 (1993).</li><li>Gambis, A., Dourlen, P., Steller, H., Mollereau, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Two-color+in+vivo+imaging+of+photoreceptor+apoptosis+and+development+in+Drosophila.">Two-color in vivo imaging of photoreceptor apoptosis and development in Drosophila.</a> Dev Biol. 351, 128-1234 (2011).</li><li>Napoletano, F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Polyglutamine+Atrophin+provokes+neurodegeneration+in+Drosophila+by+repressing+fat.">Polyglutamine Atrophin provokes neurodegeneration in Drosophila by repressing fat.</a> The EMBO journal. 30, 945-958 (2011).</li><li>Ravikumar, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Inhibition+of+mTOR+induces+autophagy+and+reduces+toxicity+of+polyglutamine+expansions+in+fly+and+mouse+models+of+Huntington+disease.">Inhibition of mTOR induces autophagy and reduces toxicity of polyglutamine expansions in fly and mouse models of Huntington disease.</a> Nature. 36, 585-595 (2004).</li><li>Zou, S., Meadows, S., Sharp, L., Jan, L. Y., Jan, Y. N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Genome-wide+study+of+aging+and+oxidative+stress+response+in+Drosophila+melanogaster.">Genome-wide study of aging and oxidative stress response in Drosophila melanogaster.</a> Proceedings of the National Academy of Sciences of the United States of America. 97, 13726-13731 (2000).</li></ol>

Çıkar çatışması ilan etti.

Burada sunulan tek ommatidium diseksiyonu Drosophila göz modellenen nörodejenerasyon gibi süreçleri hakkında derin hücre biyolojik bilgi toplama sağlar. Fotoreseptör nöronlar diğer nöronlarla daha kolay erişilebilir ve onlar sitoplazma, in vivo olarak nörodejenerasyon ölçmek için birçok model yetkin kullanılan çok aynı hücrelerde, özellikle büyük ve böylece vezikül dinamiklerini incelemek için uygun . Diseksiyon kritik yönü ağırlıklı olarak Sabitlenmemiş doku kadar kur...

<table border="1"><tbody><tr><th> Reaktifin Adı </th><th> Şirket </th><th> Katalog numarası </th><th> Yorumlar (isteğe bağlı) </th></tr><tr><td> Taşınabilir CO2 Dispenseri </td><td> Flystuff </td><td> 59-150 </td><td> Bilgiler mevcut </td></tr><tr><td> DUMONT Cımbız No 5 </td><td> Bilimsel AGAR </td><td> T5034 </td><td></td></tr><tr><td> 3-Well Cam Slayt </td><td> EMS </td><td> 71561-01 </td><td></td></tr><tr><td> Mikro makas </td><td> VWR </td><td> HAMMHSB516-09 </td><td></td></tr><tr><td> Schneider Orta </td><td> VWR </td><td> 733-1663 </td><td></td></tr><tr><td> LysoTracker Kırmızı DND-99 </td><td> Invitrogen </td><td> L7528 </td><td></td></tr><tr><td> SuperFrost Slaytlar </td><td> VWR </td><td> 631-0108 </td><td></td></tr><tr><td> DAPI ile Vectashield </td><td> Vektör Labs </td><td> H-1200 </td><td></td></tr><tr><td> Lameller </td><td> VWR </td><td> 631-1336 </td><td></td></tr></tbody></table>

single drosophila ommatidium dissection and imaging

Meyve sineği Drosophila melanogaster sinirbilim araştırması için çok değerli katkılarda bulunmuştur ve nörodejeneratif hastalıklar için çünkü güçlü genetik 1 bir model olarak yaygın olarak kullanılmaya başlanmıştır. Özellikle sinek göz Drosophila sinir sisteminin en erişilebilir ve yaşam vazgeçilebilir bir parçası olmak, nörodejenerasyon araştırma için tercih organı olmuştur . Ancak sağlam gözleri en önemli uyarı nörodejenerasyon anlamak için her şeyden otofaji dinamikleri 2 hücre içi olaylar gibi görüntüleme, çünkü pigment yoğun otofloresans zorluk. Biz son zamanlarda Dentatorubro-Pallidoluysian Atrofi bir sinek modeli (DRPLA) 3, 4 otofajik işlev bozukluklarının anlaşılması için gerekli olan tek ommatidia 3 diseksiyon ve kültür kullandık . Şimdi nörodejenerasyon için sinek modelleri olasılığını önemli ölçüde genişletmek için muhtemel elektrofizyolojik çalışmalar 5, uyarlanmış bu tekniği (Şekil 1), kapsamlı bir açıklama raporu . Bu yöntem, görüntü, canlı hücre içi olaylar ve fotoreseptör hücrelerinin (Şekil 2) üzerine etkili ilaç yönetimini izlemek için adapte edilebilir. , Mozaik teknikleri 6-8 ile birlikte kullanılması durumunda, hücrelerin genetik olarak farklı tepkiler (Şekil 2) paralel olarak test edilebilir .

Watch this Scientific Journal Video about Single Drosophila Ommatidium Dissection and Imaging at JoVE.com

Single Drosophila Ommatidium Dissection and Imaging

Yetişkin kullanımı sınırlayıcı faktör<em&gt; Drosophila</em&gt; Göz nörodejenerasyon ve hücre biyolojisi çalışmada, hücre içi süreçlerin zor görüntüleme. Biz, ilaç tedavisi ve ileri görüntüleme konusu olabilir iyi niyetli bir primer nöronal hücre kültürü, oluşturmak için tek ommatidia diseksiyonu açıklar.

Tek Drosophila Ommatidium Diseksiyon ve Görüntüleme

The fruit fly Drosophila melanogaster has made invaluable contributions to neuroscience research and has been used widely as a model for neurodegenerative ...

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Neuroscience

Single Drosophila Ommatidium Dissection and Imaging

14.0K Görüntüleme.  King's College London. Yetişkin kullanımı sınırlayıcı faktör Drosophila Göz nörodejenerasyon ve hücre biyolojisi çalışmada, hücre içi süreçlerin zor görüntüleme. Biz, ilaç tedavisi ve ileri görüntüleme konusu olabilir iyi niyetli bir primer nöronal hücre kültürü, oluşturmak için tek ommatidia diseksiyonu açıklar.

Video: Single Drosophila Ommatidium Dissection and Imaging

Single Sensillum Recordings in the Insects Drosophila melanogaster and Anopheles gambiae

The sense of smell is essential for insects to find foods, mates, predators, and oviposition sites3. Insect olfactory sensory neurons (OSNs) are enclosed in sensory hairs called sensilla, which cover the surface of olfactory organs. The surface of each sensillum is covered with tiny pores, through which odorants pass and dissolve in a fluid called sensillum lymph, which bathes the sensory dendrites of the OSNs housed in a given sensillum. The OSN dendrites express odorant receptor (OR) proteins, which in insects function as odor-gated ion channels4, 5. The interaction of odorants with ORs either increases or decreases the basal firing rate of the OSN. This neuronal activity in the form of action potentials embodies the first representation of the quality, intensity, and temporal characteristics of the odorant6, 7.
Given the easy access to these sensory hairs, it is possible to perform extracellular recordings from single OSNs by introducing a recording electrode into the sensillum lymph, while the reference electrode is placed in the lymph of the eye or body of the insect. In Drosophila, sensilla house between one and four OSNs, but each OSN typically displays a characteristic spike amplitude. Spike sorting techniques make it possible to assign spiking responses to individual OSNs. This single sensillum recording (SSR) technique monitors the difference in potential between the sensillum lymph and the reference electrode as electrical spikes that are generated by the receptor activity on OSNs1, 2, 8. Changes in the number of spikes in response to the odorant represent the cellular basis of odor coding in insects. Here, we describe the preparation method currently used in our lab to perform SSR on Drosophila melanogaster and Anopheles gambiae, and show representative traces induced by the odorants in a sensillum-specific manner.

Single Sensillum Recordings in the Insects Drosophila melanogaster and Anopheles gambiae

Electrophysiological responses of olfactory sensory neurons to odorants can be measured in insects using single sensillum recordings. In this video article we will demonstrate how to perform single sensillum recordings in the antennae of the vinegar fly (Drosophila melanogaster) and the maxillary palps of the malaria mosquito (Anopheles gambiae).

Böcekler Tek Sensillum Kayıtlar Drosophila melanogaster Ve Anofel gambiae</em

The sense of smell is essential for insects to find foods, mates, predators, and oviposition sites3. Insect olfactory sensory neurons (OSNs) are enclosed ...

Nörobilim

Dissection and Imaging of Active Zones in the Drosophila Neuromuscular Junction

The Drosophila larvae neuromuscular junction (NMJ) is an excellent model for the study of synaptic structure and function. Drosophila is well known for the ease of powerful genetic manipulations and the larval nervous system has proven particularly useful in studying not only normal function but also perturbations that accompany some neurological disease (Lloyd and Taylor, 2010). Many key synaptic molecules found in Drosophila are also found in mammals and like most CNS excitatory synapses in mammals, the Drosophila NMJ is glutamatergic and demonstrates activity-dependent remodeling (Kohet al. , 2000). Additionally, Drosophila neurons can be individually identified because their innervation patterns are stereotyped and repetitive making it possible to study identified synaptic terminals, such as those between motor neurons and the body-wall muscle fibers that they innervate (Keshishian and Kim, 2004). The existence of evolutionarily conserved synapse components along with the ease of genetic and physical manipulation make the Drosophila model ideal for investigating the mechanisms underlying synaptic function (Budnik, 1996).
The active zones at synaptic terminals are of particular interest because these are the sites of neurotransmitter release. NC82 is a monoclonal antibody that recognizes the Drosophila protein Bruchpilot (Brp), a CAST1/ERC family member that is an important component of the active zone (Waghet al. , 2006). Brp was shown to directly shape the active zone T-bar and is responsible for effectively clustering Ca2+ channels beneath the T-bar density (Fouquetet al. , 2009). Mutants of Brp have reduced Ca2+ channel density, depressed evoked vesicle release, and altered short-term plasticity (Kittelet al. , 2006). Alterations to active zones have been observed in Drosophila disease models. For example, immunofluorescence using the NC82 antibody showed that the active zone density was decreased in models of amyotrophic lateral sclerosis and Pitt-Hopkins syndrome (Ratnaparkhiet al. , 2008; Zweieret al. , 2009). Thus, evaluation of active zones, or other synaptic proteins, in Drosophila larvae models of disease may provide a valuable initial clue to the presence of a synaptic defect.
Preparing whole-mount dissected Drosophila larvae for immunofluorescence analysis of the NMJ requires some skill, but can be accomplished by most scientists with a little practice. Presented is a method that provides for multiple larvae to be dissected and immunostained in the same dissection dish, limiting environmental differences between each genotype and providing sufficient animals for confidence in reproducibility and statistical analysis.

Dissection and Imaging of Active Zones in the Drosophila Neuromuscular Junction

The neuromuscular junction (NMJ) of Drosophila melanogaster is an important model system for studying normal synaptic function as well as perturbations to synaptic function found in certain neurological diseases. We present a protocol for dissection of the Drosophila larval motor system and immunostaining for active zone proteins within the NMJ.

Aktif Bölgeleri Diseksiyon ve Görüntüleme Drosophila Nöromüsküler Junction

The Drosophila  larvae neuromuscular junction (NMJ) is an excellent model for the study of synaptic structure and function. Drosophila  is well known for ...

Dissection and Immunohistochemistry of Larval, Pupal and Adult Drosophila Retinas

The compound eye of Drosophila melanogaster consists of about 750 ommatidia (unit eyes). Each ommatidium is composed of about 20 cells, including lens-secreting cone cells, pigment cells, a bristle cell and eight photoreceptors (PRs) R1-R8 2. The PRs have specialized microvillar structures, the rhabdomeres, which contain light-sensitive pigments, the Rhodopsins (Rhs). The rhabdomeres of six PRs (R1-R6) form a trapezoid and contain Rh1 3 4. The rhabdomeres of R7 and R8 are positioned in tandem in the center of the trapezoid and share the same path of light. R7 and R8 PRs stochastically express different combinations of Rhs in two main subtypes5: In the 'p' subtype, Rh3 in pR7s is coupled with Rh5 in pR8s, whereas in the 'y' subtype, Rh4 in yR7s is associated with Rh6 in yR8s 6 7 8.
Early specification of PRs and development of ommatidia begins in the larval eye-antennal imaginal disc, a monolayer of epithelial cells. A wave of differentiation sweeps across the disc9 and initiates the assembly of undifferentiated cells into ommatidia10-11. The 'founder cell' R8 is specified first and recruits R1-6 and then R7 12-14. Subsequently, during pupal development, PR differentiation leads to extensive morphological changes 15, including rhabdomere formation, synaptogenesis and eventually rh expression.
In this protocol, we describe methods for retinal dissections and immunohistochemistry at three defined periods of retina development, which can be applied to address a variety of questions concerning retinal formation and developmental pathways. Here, we use these methods to visualize the stepwise PR differentiation at the single-cell level in whole mount larval, midpupal and adult retinas (Figure 1).

Dissection and Immunohistochemistry of Larval, Pupal and Adult Drosophila Retinas

The Drosophila retina is a crystal-like lattice composed of a small number of cell types that are generated in a stereotyped manner 1. Its amenability to sophisticated genetic analysis allows the study of complex developmental programs. This protocol describes dissections and immunohistochemistry of retinas at three discrete developmental stages, with a focus on photoreceptor differentiation.

Larva, Pupa ve Erişkin diseksiyonu ve İmmünohistokimya<em&gt; Drosophila</em&gt; Retinaları

The compound eye of Drosophila melanogaster consists of about 750 ommatidia (unit eyes). Each ommatidium is composed of about 20 cells, including ...

Labeling of Single Cells in the Central Nervous System of Drosophila melanogaster

In this article we describe how to individually label neurons in the embryonic CNS of Drosophila melanogaster by juxtacellular injection of the lipophilic fluorescent membrane marker DiI. This method allows the visualization of neuronal cell morphology in great detail. It is possible to label any cell in the CNS: cell bodies of target neurons are visualized under DIC optics or by expression of a fluorescent genetic marker such as GFP. After labeling, the DiI can be transformed into a permanent brown stain by photoconversion to allow visualization of cell morphology with transmitted light and DIC optics. Alternatively, the DiI-labeled cells can be observed directly with confocal microscopy, enabling genetically introduced fluorescent reporter proteins to be colocalised. The technique can be used in any animal, irrespective of genotype, making it possible to analyze mutant phenotypes at single cell resolution.

Labeling of Single Cells in the Central Nervous System of Drosophila melanogaster

We present a technique for labeling single neurons in the central nervous system (CNS) of Drosophila embryos, which allows the analysis of neuronal morphology by either transmitted light or confocal microscopy.

Merkez Sinir Sistemi Tek Hücreler Etiketleme<em&gt; Drosophila melanogaster</em

In this  article we describe how to individually label neurons in the embryonic CNS of Drosophila melanogaster by juxtacellular injection of the ...

A Single-fly Assay for Foraging Behavior in Drosophila

For many animals, hunger promotes changes in the olfactory system in a manner that facilitates the search for appropriate food sources. In this video article, we describe an automated assay to measure the effect of hunger or satiety on olfactory dependent food search behavior in the adult fruit fly Drosophila melanogaster. In a light-tight box illuminated by red light that is invisible to fruit flies, a camera linked to custom data acquisition software monitors the position of six flies simultaneously. Each fly is confined to walk in individual arenas containing a food odor at the center. The testing arenas rest on a porous floor that functions to prevent odor accumulation. Latency to locate the odor source, a metric that reflects olfactory sensitivity under different physiological states, is determined by software analysis. Here, we discuss the critical mechanics of running this behavioral paradigm and cover specific issues regarding fly loading, odor contamination, assay temperature, data quality, and statistical analysis.

A Single-fly Assay for Foraging Behavior in Drosophila

In this video article, we describe an automated assay to measure the effect of hunger or satiety on olfactory dependent food search behavior in the adult fruit fly Drosophila melanogaster.

Toplayıcılık Davranış için Tek-sinek Deneyi<em&gt; Drosophila</em

For many animals, hunger promotes changes in the olfactory system in a manner that facilitates the search for appropriate food sources. In this video ...

Live Imaging of Drosophila Larval Neuroblasts

Stem cells divide asymmetrically to generate two progeny cells with unequal fate potential: a self-renewing stem cell and a differentiating cell. Given their relevance to development and disease, understanding the mechanisms that govern asymmetric stem cell division has been a robust area of study. Because they are genetically tractable and undergo successive rounds of cell division about once every hour, the stem cells of the Drosophila central nervous system, or neuroblasts, are indispensable models for the study of stem cell division. About 100 neural stem cells are located near the surface of each of the two larval brain lobes, making this model system particularly useful for live imaging microscopy studies. In this work, we review several approaches widely used to visualize stem cell divisions, and we address the relative advantages and disadvantages of those techniques that employ dissociated versus intact brain tissues. We also detail our simplified protocol used to explant whole brains from third instar larvae for live cell imaging and fixed analysis applications.

Live Imaging of Drosophila Larval Neuroblasts

This protocol details a streamlined method used to conduct live cell imaging in the context of an intact larval brain. Live cell imaging approaches are invaluable for the study of asymmetric neural stem cell divisions as well as other neurogenic and developmental processes, consistently uncovering mechanisms that were previously overlooked.

Canlı Görüntüleme<em&gt; Drosophila</em&gt; Larva nöroblastomun

Stem cells divide asymmetrically to generate two progeny cells with unequal fate potential: a self-renewing stem cell and a differentiating cell. Given ...

A Simple One-step Dissection Protocol for Whole-mount Preparation of Adult Drosophila Brains

There is an increasing interest in using Drosophila to model human brain degenerative diseases, map neuronal circuitries in adult brains, and study the molecular and cellular basis of higher brain functions. A whole-mount preparation of adult brains with well-preserved morphology is critical for such whole brain-based studies, but can be technically challenging and time-consuming. This protocol describes an easy-to-learn, one-step dissection approach of an adult fly head in less than 10 s, while keeping the intact brain attached to the rest of the body to facilitate subsequent processing steps. The procedure helps remove most of the eye and tracheal tissues normally associated with the brain that can interfere with the later imaging step, and also places less demand on the quality of the dissecting forceps. Additionally, we describe a simple method that allows convenient flipping of the mounted brain samples on a coverslip, which is important for imaging both sides of the brains with similar signal intensity and quality. As an example of the protocol, we present an analysis of dopaminergic (DA) neurons in adult brains of WT (w1118) flies. The high efficacy of the dissection method makes it particularly useful for large-scale adult brain-based studies in Drosophila.

A Simple One-step Dissection Protocol for Whole-mount Preparation of Adult Drosophila Brains

The adult Drosophila brain is a valuable system for studying neuronal circuitry, higher brain functions, and complex disorders. An efficient method to dissect whole brain tissue from the small fly head will facilitate brain-based studies. Here we describe a simple, one-step dissection protocol of adult brains with well-preserved morphology.

Basit Bir adım Yetişkin Tüm montaj Hazırlama Diseksiyon Protokolü<em&gt; Drosophila</em&gt; Brain

There is an increasing interest in using Drosophila to model human brain degenerative diseases, map neuronal circuitries in adult brains, and study the ...

In Vivo Single-Molecule Tracking at the Drosophila Presynaptic Motor Nerve Terminal

An increasing number of super-resolution microscopy techniques are helping to uncover the mechanisms that govern the nanoscale cellular world. Single-molecule imaging is gaining momentum as it provides exceptional access to the visualization of individual molecules in living cells. Here, we describe a technique that we developed to perform single-particle tracking photo-activated localization microscopy (sptPALM) in Drosophila larvae. Synaptic communication relies on key presynaptic proteins that act by docking, priming, and promoting the fusion of neurotransmitter-containing vesicles with the plasma membrane. A range of protein-protein and protein-lipid interactions tightly regulates these processes and the presynaptic proteins therefore exhibit changes in mobility associated with each of these key events. Investigating how mobility of these proteins correlates with their physiological function in an intact live animal is essential to understanding their precise mechanism of action. Extracting protein mobility with high resolution in vivo requires overcoming limitations such as optical transparency, accessibility, and penetration depth. We describe how photoconvertible fluorescent proteins tagged to the presynaptic protein Syntaxin-1A can be visualized via slight oblique illumination and tracked at the motor nerve terminal or along the motor neuron axon of the third instar Drosophila larva.

In Vivo Single-Molecule Tracking at the Drosophila Presynaptic Motor Nerve Terminal

Here we illustrate how single molecule photo-activated localization microscopy can be carried out on the motor nerve terminal of a live Drosophila melanogaster third instar larva.

Vivo Tek molekül Drosophila Presynaptic Motor sinir Terminal izleme

An increasing number of super-resolution microscopy techniques are helping to uncover the mechanisms that govern the nanoscale cellular world. ...

Single-cell Resolution Fluorescence Live Imaging of Drosophila Circadian Clocks in Larval Brain Culture

The circadian pacemaker circuit orchestrates rhythmic behavioral and physiological outputs coordinated with environmental cues, such as day/night cycles. The molecular clock within each pacemaker neuron generates circadian rhythms in gene expression, which underlie the rhythmic neuronal functions essential to the operation of the circuit. Investigation of the properties of the individual molecular oscillators in different subclasses of pacemaker neurons and their interaction with neuronal signaling yields a better understanding of the circadian pacemaker circuit. Here, we present a time-lapse fluorescent microscopy approach developed to monitor the molecular clockwork in clock neurons of cultured Drosophila larval brain. This method allows the multi-day recording of the rhythms of genetically encoded fluorescent circadian reporters at single-cell resolution. This setup can be combined with pharmacological manipulations to closely analyze real-time response of the molecular clock to various compounds. Beyond circadian rhythms, this multipurpose method in combination with powerful Drosophila genetic techniques offers the possibility to study diverse neuronal or molecular processes in live brain tissue.

Single-cell Resolution Fluorescence Live Imaging of Drosophila Circadian Clocks in Larval Brain Culture

The goal of this protocol is to establish ex vivo Drosophila larval brain culture optimized to monitor circadian molecular rhythms with long-term fluorescence time-lapse imaging. The application of this method to pharmacological assays is also discussed.

Tek hücreli çözünürlük Floresans canlı görüntüleme Drosophila sirkadiyen saatler larva beyin kültür

The circadian pacemaker circuit orchestrates rhythmic behavioral and physiological outputs coordinated with environmental cues, such as day/night cycles. ...

Dissection of Single Skeletal Muscle Fibers for Immunofluorescent and Morphometric Analyses of Whole-Mount Neuromuscular Junctions

The neuromuscular junction (NMJ) is a specialized point of contact between the motor nerve and the skeletal muscle. This peripheral synapse exhibits high morphological and functional plasticity. In numerous nervous system disorders, NMJ is an early pathological target resulting in neurotransmission failure, weakness, atrophy, and even in muscle fiber death. Due to its relevance, the possibility to quantitatively assess certain aspects of the relationship between NMJ components can help to understand the processes associated with its assembly/disassembly. The first obstacle when working with muscles is to gain the technical expertise to quickly identify and dissect without damaging their fibers. The second challenge is to utilize high-quality detection methods to obtain NMJ images that can be used to perform quantitative analysis. This article presents a step-by-step protocol for dissecting extensor digitorum longus and soleus muscles from rats. It also explains the use of immunofluorescence to visualize pre and postsynaptic elements of whole-mount NMJs. Results obtained demonstrate that this technique can be used to establish the microscopic anatomy of the synapsis and identify subtle changes in the status of some of its components under physiological or pathological conditions.

The ability to accurately detect neuromuscular junction components is crucial in evaluating modifications in its architecture because of pathological or developmental processes. Here we present a complete description of a straightforward method to obtain high-quality images of whole-mount neuromuscular junctions that can be used to perform quantitative measurements.

Tüm Mount Nöromüsküler Kavşakların İmmünofluoresan ve Morfometrik Analizleri için Tek İskelet Kas Liflerinin Diseksiyonu

The neuromuscular junction (NMJ) is a specialized point of contact between the motor nerve and the skeletal muscle. This peripheral synapse exhibits high ...