Il finanziamento fornito dal borse Ribble G. nel Dipartimento di Biologia, il Kentucky Giovani Ricercatori universitari e Istruzione-eureka! Ufficio (Univ. di KY).

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	<li>Ashton, K., Wagoner, A. P., Carrillo, R., Gibson, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Quantitative+trait+loci+for+the+monoamine-related+traits+heart+rate+and+headless+behavior+in+Drosophila+melanogaster.">Quantitative trait loci for the monoamine-related traits heart rate and headless behavior in Drosophila melanogaster.</a> Genetics. 157, 283-294 (2001).</li><li>Azpiazu, N., Frasch, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Tinman+and+Bagpipe:+Two+homeo+box+genes+that+determine+cell+fates+in+the+dorsal+mesoderm+of+Drosophila.">Tinman and Bagpipe: Two homeo box genes that determine cell fates in the dorsal mesoderm of Drosophila.</a> Genes &#38; Development. 7, 1325-1340 (1993).</li><li>Badre, N. H., Martin, M. E., Cooper, R. 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N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+new+homeobox-containing+gene,+msh-2,+is+transiently+expressed+early+during+mesoderm+formation+of+Drosophila.">A new homeobox-containing gene, msh-2, is transiently expressed early during mesoderm formation of Drosophila.</a> Development. 110, 661-669 (1990).</li><li>Cooper, A. S., Cooper, R. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Monitoring+activity+of+Drosophila+larvae:+Impedance+&#38;+video+microscopy+measures.">Monitoring activity of Drosophila larvae: Impedance &#38; video microscopy measures.</a> Drosophila Information Service. 87, 85-87 (2004).</li><li>Dasari, S., Cooper, R. 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B. 167, 89-97 (1997).</li><li>Johnson, E., Ringo, J., Bray, N., Dowse, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Genetic+and+pharmacological+identification+of+ion+channels+central+to+the+Drosophila+cardiac+pacemaker.">Genetic and pharmacological identification of ion channels central to the Drosophila cardiac pacemaker.</a> J. Neurogenetics. 12, 1-24 (1998).</li><li>Johnson, E., Ringo, J., Dowse, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Native+and+heterologous+neuropeptides+are+cardioactive+in+Drosophila+melanogaster.">Native and heterologous neuropeptides are cardioactive in Drosophila melanogaster.</a> J. 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A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Control+of+circulation+in+insects.">Control of circulation in insects.</a> General Pharmacol. 29, 23-38 (1997).</li><li>Molina, M. R., Cripps, R. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ostia,+the+inflow+tracts+of+the+Drosophila+heart,+develop+from+a+genetically+distinct+subset+of+cardial+cells.">Ostia, the inflow tracts of the Drosophila heart, develop from a genetically distinct subset of cardial cells.</a> Mechanisms of Development. 118, 51-59 (2001).</li><li>Muller, K. J., Nicholls, J. G., Stent, G. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Neurobiology of the Leech. , 254-254 (1981).</li><li>Nichols, R., Kaminski, S., Walling, E., Zornik, E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Regulating+the+activity+of+a+cardioacceleratory+peptide.">Regulating the activity of a cardioacceleratory peptide.</a> Peptides. 20, 1153-1158 (1999).</li><li>Ocorr, K., Akasaka, T., Bodmer, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Age-related+cardiac+disease+model+of+Drosophila.">Age-related cardiac disease model of Drosophila.</a> Mechanisms of Ageing and Development. 128, 112-116 (2007a).</li><li>Ocorr, K. A., Crawley, T., Gibson, G., Bodmer, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Genetic+variation+for+cardiac+dysfunction+in+Drosophila.">Genetic variation for cardiac dysfunction in Drosophila.</a> PLoS ONE. 2, e601-e601 (2007).</li><li>Papaefthmiou, C., Theophilidis, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=An+in+vitro+method+for+recording+the+electrical+activity+of+the+isolated+heart+of+the+adult+Drosophila+melanogaster.">An in vitro method for recording the electrical activity of the isolated heart of the adult Drosophila melanogaster.</a> In Vitro Cellular &#38; Developmental Biol. Animal. 37, 445-449 (2001).</li><li>Peron, S., Zordan, M. A., Magnabosco, A., Reggiani, C., Megighian, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=From+action+potential+to+contraction:+Neural+control+and+excitation-contraction+coupling+in+larval+muscles+of+Drosophila.">From action potential to contraction: Neural control and excitation-contraction coupling in larval muscles of Drosophila.</a> Comp. Biochem.Physiol. A: Molecular &#38; Integrative Physiol. 154, 173-183 (2009).</li><li>Ponzielli, R., Astier, M., Chartier, A., Gallet, A., Therond, P., Semeriva, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Heart+tube+patterning+in+Drosophila+requires+integration+of+axial+and+segmental+information+provided+by+the+Bithorax+Complex+genes+and+hedgehog+signaling.">Heart tube patterning in Drosophila requires integration of axial and segmental information provided by the Bithorax Complex genes and hedgehog signaling.</a> Develop. 129, 4509-4521 (2002).</li><li>Sl ma, K., Farkas, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Heartbeat+patterns+during+the+postembryonic+development+of+Drosophila+melanogaster.">Heartbeat patterns during the postembryonic development of Drosophila melanogaster.</a> J. Insect Physiol. 51, 489-503 (2005).</li><li>St hmer, W., Roberts, W. S., Almers, W., Sakmann, B., Neher, E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Single channel recordings. The loose patch clamp, 123-132 (1983).</li><li>Wessells, R. J., Bodmer, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Screening+assays+for+heart+function+mutants+in+Drosophila.">Screening assays for heart function mutants in Drosophila.</a> Biotechniques. 37, 58-66 (2004).</li><li>Zornik, E., Paisley, K., Nichols, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Neural+transmitters+and+a+peptide+modulate+Drosophila+heart+rate.">Neural transmitters and a peptide modulate Drosophila heart rate.</a> Peptides. 20, 45-51 (1999).</li></ol>

<ol><li> Strumenti di dissezione: Fine # 5 pinzette e forbici fine (tutti ottenuti da Strumenti Scienze Fine (USA), Inc., 373-G Vintage Park Drive, Foster City, CA 94404-1139) </li><li> Dissezione microscopio con funzione di zoom per la dissezione e la frequenza cardiaca di conteggio. Per la stimolazione focale del cuore questo è necessario pure. </li><li> Per le registrazioni extracellulari e intracellulari un microscopio composto con obiettivi in ​​posizione verticale (4 x e 20X) viene utilizzato. Standard amplificatore intracellulare e A / D a bordo per la registrazione in linea a un computer. I segnali elettrici vengono registrati in linea ad una interfaccia PowerLab/4s (ADInstruments, Australia). Noi utilizziamo software standard da ADInstruments nome o Campo Grafico. </li><li> Prodotti chimici: Tutti i prodotti chimici saline sono ottenuti da Sigma Chemical Company (St. Louis, MO). </li><li> Per le registrazioni intracellulari usiamo tubo capillare di vetro (catalogo # 30-31-0 da FHC, Brunswick, ME, 04011, USA) e per la registrazione macropatch focali e gli elettrodi stimolanti usiamo Kimax-51, Kimble Art Prodotti. N. 34502, ID 0.8-1.1mm, lunghezza 100mm. L&#39;elettrodo intracellulare dovrebbe avere una resistenza di 20 a 30 mOhm. L&#39;elettrodo macropatch è costruito rompendo la punta di un vetro dopo una punta fine è stata fatta da un elettrodo estrattore. La punta fuori rotta deve essere una rottura perpendicolare pulito circa 20μM di diametro. La punta è poi il calore lucidato a circa 10μM diametro interno per la registrazione focale extracellulare. Per l&#39;elettrodo stimolante per guidare il cuore che usiamo una punta finale di circa 20-50 micron di diametro. L&#39;albero dell&#39;elettrodo viene investito un elemento riscaldante per indurla a piegarsi di circa 45 gradi con una curva graduale. Questo produce un appartamento o lume elettrodo perpendicolare sul tubo cuore come l&#39;angolo con il micro-manipolatore produrrà circa altri 45 gradi rispetto alla preparazione. </li></ol>

monitoring heart function in larval drosophila melanogaster for physiological studies

Vi presentiamo vari metodi per registrare la funzione cardiaca nei larvale<em&gt; Drosophila</em&gt;. Gli approcci permettono la frequenza cardiaca di essere misurato in sfrenato e trattenuto larve intero. Per il controllo diretto dell&#39;ambiente intorno al cuore un altro approccio sfrutta le larve sezionato e la rimozione degli organi interni in modo da bagnare il cuore in composti desiderato. Il cuore esposto consente inoltre di potenziali di membrana da monitorare che può dare comprensione delle correnti ioniche generate dal miociti e di conduzione elettrica lungo il tubo cuore. Questi approcci hanno vantaggi e svantaggi per gli esperimenti futuri che sono discussi. La preparazione cuore larvale fornisce un modello aggiuntivo oltre ai<em&gt; Drosophila</em&gt; Scheletrico NMJ per indagare il ruolo della regolazione del calcio intracellulare sulla funzione cellulare. Conoscere meglio le correnti ioniche di fondo che danno forma al potenziali d&#39;azione in miociti in varie specie, si può sperare di ottenere un handle sul disfunzioni noto ionici associati a specifici geni responsabili di varie malattie nei mammiferi.

Watch this Scientific Journal Video about Monitoring Heart Function in Larval Drosophila melanogaster for Physiological Studies at JoVE.com

Monitoring Heart Function in Larval Drosophila melanogaster for Physiological Studies

Vi presentiamo vari modi per monitorare la funzione cardiaca in larva di<em&gt; Drosophila</em&gt; Per valutare le domande che fare con la funzione delle giunzioni gap, le mutazioni dei canali ionici, modulazione dell&#39;attività pacemaker e degli studi farmacologici.

Il monitoraggio delle funzioni cardiaca in larvali Drosophila melanogaster Per gli Studi fisiologici

We present various methods to record cardiac function in the larval Drosophila. The approaches allow heart rate to be measured in unrestrained  and  ...

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Universidad de Cartagena UDEC

Research

JoVE Journal

Biology

Monitoring Heart Function in Larval Drosophila melanogaster for Physiological Studies

18.8K Views.  University of Kentucky, Lexington. Vi presentiamo vari modi per monitorare la funzione cardiaca in larva di Drosophila Per valutare le domande che fare con la funzione delle giunzioni gap, le mutazioni dei canali ionici, modulazione dell'attività pacemaker e degli studi farmacologici.

Video: Monitoring Heart Function in Larval Drosophila melanogaster for Physiological Studies

High-Resolution Video Tracking of Locomotion in Adult Drosophila Melanogaster

Flies provide an important model for studying complex behavior due to the plethora of genetic tools available to researchers in this field. Studying locomotor behavior in Drosophila melanogaster relies on the ability to be able to quantify changes in motion during or in response to a given task. For this reason, a high-resolution video tracking system, such as the one we describe in this paper, is a valuable tool for measuring locomotion in real-time. Our protocol involves the use of an initial air pulse to break the flies momentum, followed by a thirty second filming period in a square chamber. A tracking program is then used to calculate the instantaneous speed of each fly within the chamber in 10 msec increments. Analysis software then compiles this data, and outputs a variety of parameters such as average speed, max speed, time spent in motion, acceleration, etc. This protocol will discuss proper feeding and management of flies for behavioral tasks, handling flies without anesthetization or immobilization, setting up a controlled environment, and running the assay from start to finish.

The study of complex locomotor behavior in Drosophila melanogaster is dependent upon the ability to quantify changes in a given fly's movement. This article demonstrates how to do this using a high-resolution tracking system.

Monitoraggio ad alta risoluzione video di locomozione per adulti in Drosophila melanogaster

Flies provide an important model for studying complex behavior due to the plethora of genetic tools available to researchers in this field.  Studying ...

Ricerca

Biologia

Fluorescent Labeling of Drosophila Heart Structures

The Drosophila melanogaster dorsal vessel, or heart, is a tubular structure comprised of a single layer of contractile cardiomyocytes, pericardial cells that align along each side of the heart wall, supportive alary muscles and, in adults, a layer of ventral longitudinal muscle cells. The contractile fibers house conserved constituents of the muscle cytoarchitecture including densely packed bundles of myofibrils and cytoskeletal/submembranous protein complexes, which interact with homologous components of the extracellular matrix. Here we describe a protocol for the fixation and the fluorescent labeling of particular myocardial elements from the hearts of dissected larvae and semi-intact adult Drosophila. Specifically, we demonstrate the labeling of sarcomeric F-actin and of &alpha;-actinin in larval hearts. Additionally, we perform labeling of F-actin and &alpha;-actinin in myosin-GFP expressing adult flies and of &alpha;-actinin and pericardin, a type IV extracellular matrix collagen, in wild type adult hearts. Particular attention is given to a mounting strategy for semi-intact adult hearts that minimizes handling and optimizes the opportunity for maintaining the integrity of the cardiac tubes and the associated tissues. These preparations are suitable for imaging via fluorescent and confocal microscopy. Overall, this procedure allows for careful and detailed analysis of the structural characteristics of the heart from a powerful genetically tractable model system.

Fluorescent Labeling of Drosophila Heart Structures

Here we describe a basic protocol for fluorescent labeling of different elements of heart tubes from larva and adult Drosophila melanogaster. These specimens are well-suited for imaging via fluorescent or confocal microscopy. This technique permits detailed structural analysis of the features of the hearts from a powerful model organism.

Etichette fluorescenti di Drosophila Cuore Strutture

The Drosophila melanogaster dorsal vessel, or heart, is a tubular structure comprised of a single layer of contractile cardiomyocytes, pericardial cells ...

Visualizing the Beating Heart in Drosophila

The Drosophila heart has recently emerged as a good model system for examining the genetic, cellular, and molecular mechanisms underlying function in myogenic hearts. A key step in examining heart function in the fly is finding a way to access the heart in a manner that preserves its myogenic function while still allowing the beating heart organ to be observed and recorded. Two different methods for observing and recording the beating heart in both larva and adult Drosophila are described here. Our semi-intact preparation using adult flies allows clear visualization of the abdominal heart without interference from the pigmented cuticle and overlying fat bodies. To record larval heart beats it is necessary to immobilize the larva, which minimizes body wall movements thereby reducing heart movements that are not associated with myocardial contractions. Our methodologies produce stable adult and larval heart preparations that can beat for hours at rates of 1-3 Hz.

Visualizing the Beating Heart in Drosophila

Technique required for visualizing the beating heart in larval and adult Drosophila are presented. Each life stage requires a different methodology.

Visualizzare il cuore pulsante di Drosophila</em

The Drosophila heart has recently emerged as a good model system for examining the genetic, cellular, and molecular mechanisms underlying function in ...

Semi-automated Optical Heartbeat Analysis of Small Hearts

We have developed a method for analyzing high speed optical recordings from Drosophila, zebrafish and embryonic mouse hearts (Fink, et. al., 2009). Our Semi-automatic Optical Heartbeat Analysis (SOHA) uses a novel movement detection algorithm that is able to detect cardiac movements associated with individual contractile and relaxation events. The program provides a host of physiologically relevant readouts including systolic and diastolic intervals, heart rate, as well as qualitative and quantitative measures of heartbeat arrhythmicity. The program also calculates heart diameter measurements during both diastole and systole from which fractional shortening and fractional area changes are calculated. Output is provided as a digital file compatible with most spreadsheet programs. Measurements are made for every heartbeat in a record increasing the statistical power of the output. We demonstrate each of the steps where user input is required and show the application of our methodology to the analysis of heart function in all three genetically tractable heart models.

We have developed a Semi-automated Optical Heartbeat Analysis method (SOHA) for analyzing high speed optical recordings from Drosophila, zebrafish and embryonic mouse hearts. We demonstrate the application of our methodology to the analysis of heart function in fruit fly and embryonic mouse hearts.

Semiautomatici Analisi Heartbeat ottica di piccoli cuori

We have developed a method for analyzing high speed optical recordings from Drosophila, zebrafish and embryonic mouse hearts (Fink, et. al., 2009). Our ...

Novel And Efficient Method for Drosophila Heart Fluorescence Staining with Cryosectioning

Drosophila heart models are widely employed in studying cardiac aging and modeling&#160;human cardiac diseases. However, the dissection of Drosophila hearts before imaging is a meticulous time-intensive process that requires advanced training and motor skills. To address these challenges, we present an innovative protocol that utilizes cryosectioning for the fluorescence imaging of Drosophila heart tissue. The protocol has been demonstrated in imaging the adult Drosophila heart but could be adapted for developmental stages. The method enhances both the efficiency and accessibility of fluorescence staining while preserving the integrity of the tissue. This protocol simplifies the process without compromising the quality of imaging, thereby reducing the dependency on technicians with highly developed training and motor skills. Specifically, we replace complex techniques, such as capillary vacuum suction, with more straightforward methods like tissue embedding. This approach allows for the visualization of cardiac structures with greater ease and reproducibility. We demonstrate the utility of this protocol by effectively detecting key cardiac markers and&#160;achieving high-resolution fluorescence and immunostaining imaging that unveils intricate details of heart morphology and cellular organization. This method provides a robust and accessible tool for researchers exploring Drosophila cardiac biology, facilitating detailed analyses of heart development, function, and disease models.

The Drosophila heart sectioning and fluorescence imaging protocol simplifies studying heart structure and pathologies. This approach involves straightforward sectioning, staining, and imaging, bypassing the technical expertise needed for traditional dissection. It enhances accessibility, making Drosophila a more widely usable model for cardiac-related research within the broader scientific community.

Metodo nuovo ed efficiente per la colorazione a fluorescenza cardiaca di Drosophila con criosezione

Drosophila heart models are widely employed in studying cardiac aging and modeling&#160;human cardiac diseases. However, the dissection of Drosophila ...

Genetica

Determination of the Spontaneous Locomotor Activity in Drosophila melanogaster

Drosophila melanogaster has been used as an excellent model organism to study environmental and genetic manipulations that affect behavior. One such behavior is spontaneous locomotor activity. Here we describe our protocol that utilizes Drosophila population monitors and a tracking system that allows continuous monitoring of the spontaneous locomotor activity of flies for several days at a time. This method is simple, reliable, and objective and can be used to examine the effects of aging, sex, changes in caloric content of food, addition of drugs, or genetic manipulations that mimic human diseases.

Determination of the Spontaneous Locomotor Activity in Drosophila melanogaster

Drosophila melanogaster are useful in studying genetic or environmental manipulations that affect behaviors such as spontaneous locomotor activity.&#160; Here we describe a protocol that utilizes monitors with infrared beams and data analysis software to quantify spontaneous locomotor activity.&#160;

Determinazione del locomotore attività spontanea in<em&gt; Drosophila melanogaster</em

Drosophila melanogaster has been used as an excellent model organism to study environmental and genetic manipulations that affect behavior. One such ...

Neuroscienze

A Simple Technique to Assay Locomotor Activity in Drosophila

Drosophila melanogaster is an ideal model organism for studying various diseases due to its abundance of advanced genetic manipulation techniques and diverse behavioral features. Identifying behavioral deficiency in animal models is a crucial measure of disease severity, for example, in neurodegenerative diseases where patients often experience impairments in motor function. However, with the availability of various systems to track and assess motor deficits in fly models, such as drug-treated or transgenic individuals, an economical and user-friendly system for precise evaluation from multiple angles is still lacking. A method based on the AnimalTracker application programming interface (API) is developed here, which is compatible with the Fiji image processing program, to systematically evaluate the movement activities of both adult and larval individuals from recorded video, thus allowing for the analysis of their tracking behavior. This method requires only a high-definition camera and a computer peripheral hardware integration to record and analyze behavior, making it an affordable and effective approach for screening fly models with transgenic or environmental behavioral deficiencies. Examples of behavioral tests using pharmacologically treated flies are given to show how the techniques can detect behavioral changes in both adult flies and larvae in a highly repeatable manner.

A Simple Technique to Assay Locomotor Activity in Drosophila

The present protocol assesses the locomotor activity of Drosophila by tracking and analyzing the movement of flies in a hand-made arena using open-source software Fiji, compatible with plugins to segment pixels of each frame based on high-definition video recording to calculate parameters of speed, distance, etc.

Una semplice tecnica per analizzare l'attività locomotoria nella Drosophila

Drosophila melanogaster is an ideal model organism for studying various diseases due to its abundance of advanced genetic manipulation techniques and ...

Comportamento

Electrophysiological Recording of The Central Nervous System Activity of Third-Instar Drosophila Melanogaster

The majority of the currently available insecticides target the nervous system and genetic mutations of invertebrate neural proteins oftentimes yield deleterious consequences, yet the current methods for recording nervous system activity of an individual animal is costly and laborious. This suction electrode preparation of the third-instar larval central nervous system of Drosophila melanogaster, is a tractable system for testing the physiological effects of neuroactive agents, determining the physiological role of various neural pathways to CNS activity, as well as the influence of genetic mutations to neural function. This ex vivo preparation requires only moderate dissecting skill and electrophysiological expertise to generate reproducible recordings of insect neuronal activity. A wide variety of chemical modulators, including peptides, can then be applied directly to the nervous system in solution with the physiological saline to measure the influence on the CNS activity. Further, genetic technologies, such as the GAL4/UAS system, can be applied independently or in tandem with pharmacological agents to determine the role of specific ion channels, transporters, or receptors to arthropod CNS function. In this context, the assays described herein are of significant interest to insecticide toxicologists, insect physiologists, and developmental biologists for which D. melanogaster is an established model organism. The goal of this protocol is to describe an electrophysiological method to enable the measurement of electrogenesis of the central nervous system in the model insect, Drosophila melanogaster, which is useful for testing a diversity of scientific hypotheses.

Electrophysiological Recording of The Central Nervous System Activity of Third-Instar  Drosophila Melanogaster

This protocol describes a method to record the descending electrical activity of the Drosophila melanogaster central nervous system to enable the cost-efficient and convenient testing of pharmacological agents, genetic mutations of neural proteins, and/or the role of unexplored physiological pathways.

Registrazione elettrofisiologica dell'attività del sistema nervoso centrale di terza-Instar Drosophila Melanogaster

The majority of the currently available insecticides target the nervous system and genetic mutations of invertebrate neural proteins oftentimes yield ...

Developing Drosophila melanogaster Models for Imaging and Optogenetic Control of Cardiac Function

Using Drosophila melanogaster (fruit fly) as a model organism has ensured significant progress in many areas of biological science, from cellular organization and genomic investigations to behavioral studies. Due to the accumulated scientific knowledge, in recent years, Drosophila was brought to the field of modeling human diseases, including heart disorders. The presented work describes the experimental system for monitoring and manipulating the heart function in the context of a whole live organism using red light (617 nm) and without invasive procedures. Control over the heart was achieved using optogenetic tools. Optogenetics combines the expression of light-sensitive transgenic opsins and their optical activation to regulate the biological tissue of interest. In this work, a custom integrated optical coherence tomography (OCT) imaging and optogenetic stimulation system was used to visualize and modulate the functioning D. melanogaster heart at the 3rd instar larval and early pupal developmental stages. The UAS/GAL4 dual genetic system was employed to express halorhodopsin (eNpHR2.0) and red-shifted channelrhodopsin (ReaChR), specifically in the fly heart. Details on preparing D. melanogaster for live OCT imaging and optogenetic pacing are provided. A lab-developed integration software processed the imaging data to create visual presentations and quantitative characteristics of Drosophila heart function. The results demonstrate the feasibility of initiating cardiac arrest and bradycardia caused by eNpHR2.0 activation and performing heart pacing upon ReaChR activation.

Developing Drosophila melanogaster Models for Imaging and Optogenetic Control of Cardiac Function

The present protocol describes the generation of Drosophila melanogaster expressing eNpHR2.0 or ReaChR opsins in the heart for OCT imaging and optogenetic heart pacing. Detailed instructions for Drosophila OCT imaging and heart beating modulation, including the simulation of restorable heart arrest, bradycardia, and tachycardia in live animals at different developmental stages, are reported.

Sviluppo di modelli di Drosophila melanogaster per l'imaging e il controllo optogenetico della funzione cardiaca

Using Drosophila melanogaster (fruit fly) as a model organism has ensured significant progress in many areas of biological science, from cellular ...

Bioingegneria

Measurement of Larval Activity in the Drosophila Activity Monitor

Drosophila larvae are used in many behavioral studies, yet a simple device for measuring basic parameters of larval activity has not been available. This protocol repurposes an instrument often used to measure adult activity, the TriKinetics Drosophila activity monitor (MB5 Multi-Beam Activity Monitor) to study larval activity. The instrument can monitor the movements of animals in 16 individual 8 cm glass assay tubes, using 17 infrared detection beams per tube. Logging software automatically saves data to a computer, recording parameters such as number of moves, times sensors were triggered, and animals&#8217; positions within the tubes. The data can then be analyzed to represent overall locomotion and/or position preference as well as other measurements. All data are easily accessible and compatible with basic graphing and data manipulation software. This protocol will discuss how to use the apparatus, how to operate the software and how to run a larval activity assay from start to finish.

Measurement of Larval Activity in the Drosophila Activity Monitor

This report describes a method for measuring Drosophila larval activity using the TriKinetics Drosophila Activity Monitor. The device employs infrared beams to detect movements of up to 16 individual animals. Data can be analyzed to represent motion parameters including rates and the positions of the animals within the assay chambers.

Misura della larvali attività nel<em&gt; Drosophila</em&gt; Activity Monitor

Drosophila larvae are used in many behavioral studies, yet a simple device for measuring basic parameters of larval activity has not been available. This ...

Il monitoraggio delle funzioni cardiaca in larvali Drosophila melanogaster Per gli Studi fisiologici

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