Name: a simple neuronal mechanical injury methodology to study drosophila motor neuron degeneration
Uploaded: 2017-07-19T15:00:00
Description: Watch this Scientific Journal Video about A Simple Neuronal Mechanical Injury Methodology to Study Drosophila Motor Neuron Degeneration at JoVE.com

We would like to thank all members of the Keller and Magie Labs at Quinnipiac University for helpful suggestions. In particular, we would like to thank Barron L. Lincoln II for development of this injury assay within the Keller Lab. We would also like to thank Quinnipiac University College of Arts and Science Grant-In-Aid awarded to L.C. Keller.

1. Preparation of Reagents and Equipment
<ol>
	<li>Prepare 1x Dissection Buffer (70 mM NaCl, 5 mM KCl, 0.02 mM CaCl2, 20 mM MgCl2, 10 mM NaHCO3, 115 mM sucrose, 5 mM trehalose, 5 mM HEPES;&#160;pH 7.2).</li>
	<li>Prepare 1x Phosphate-Buffered Saline (PBS).</li>
	<li>Prepare 1x PBT using 1x PBS with 0.01% Triton X-100.</li>
	<li>Prepare fruit juice agar plates.14 Briefly, mix 30 g agar in 700 mL of H2O and autoclave. Dissolve 0.5 g of methyl paraben in ...

<ol>
	<li>Bier, E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Drosophilia,+the+golden+bug,+emerges+as+a+tool+for+human+genetics.">Drosophilia, the golden bug, emerges as a tool for human genetics.</a> Nat. Rev. Genet. 6 (1), 9-23 (2005).</li><li>Ugur, B., Chen, K., Bellen, H. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Drosophila+tools+and+assays+for+the+study+of+human+diseases.">Drosophila tools and assays for the study of human diseases.</a> Dis Model Mech. 9 (3), 235-244 (2016).</li><li>McGurk, L., Berson, A., Bonini, N. 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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=Using+microfluidics+chips+for+live+imaging+and+study+of+injury+responses+in+Drosophila+larvae.">Using microfluidics chips for live imaging and study of injury responses in Drosophila larvae.</a> J Vis Exp. (84), e50998 (2014).</li><li>Eaton, B. A., Fetter, R. D., Davis, G. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Dynactic+is+necessary+for+synapse+stabilization.">Dynactic is necessary for synapse stabilization.</a> Neuron. 34 (5), 729-741 (2002).</li><li>Eaton, B. A., Davis, G. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=LIM+Kinase1+controls+synaptic+stability+downstream+of+the+type+II+BMP+receptor.">LIM Kinase1 controls synaptic stability downstream of the type II BMP receptor.</a> Neuron. 47 (5), 695-708 (2005).</li><li>Pielage, J., Fetter, R. D., Davis, G. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Presynaptic+spectrin+is+essential+for+synapse+stabilization.">Presynaptic spectrin is essential for synapse stabilization.</a> Curr Biol. 15 (10), 918-928 (2005).</li><li>Pielage, J., Cheng, L., Fetter, R. D., Carlton, P. M., Sedat, J. W., Davis, G. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+presynaptic+giant+Ankyrin+stabilizes+the+NMJ+through+regulation+or+presynaptic+microtubules+and+transsynaptic+cell+adhesion.">A presynaptic giant Ankyrin stabilizes the NMJ through regulation or presynaptic microtubules and transsynaptic cell adhesion.</a> Neuron. 58 (2), 195-209 (2008).</li><li>Massaro, C. M., Pielage, J., Davis, G. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Molecular+mechanisms+that+enhance+synapse+stability+despite+persistent+disruption+of+the+spectrin/ankryin/microtubule+cytoskeleton.">Molecular mechanisms that enhance synapse stability despite persistent disruption of the spectrin/ankryin/microtubule cytoskeleton.</a> J Cell Biol. 187 (1), 101-117 (2009).</li><li>Lincoln, B. L., Alabsi, S. H., Frendo, N., Freund, R., Keller, L. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Drosophila+neuronal+injury+follows+a+temporal+sequence+of+cellular+events+leading+to+degeneration+at+the+neuromuscular+junction.">Drosophila neuronal injury follows a temporal sequence of cellular events leading to degeneration at the neuromuscular junction.</a> J Exp Neurosci. 9, 1-9 (2015).</li><li>. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Drosophila+apple+juice-agar+plates.">Drosophila apple juice-agar plates.</a> Cold Spring Harb Protoc. , (2011).</li><li>Brent, J. R., Werner, K. M., McCabe, B. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Drosophila+larval+NMJ+immunohistochemistry.">Drosophila larval NMJ immunohistochemistry.</a> J Vis Exp. (25), (2009).</li><li>Smith, R., Taylor, J. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Dissection+and+imaging+of+active+zones+in+the+Drosophila+neuromuscular+junction.">Dissection and imaging of active zones in the Drosophila neuromuscular junction.</a> J Vis Exp. (50), (2011).</li><li>Jan, L., Jan, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Antibodies+to+horseradish+peroxidase+as+specific+neuronal+markers+in+Drosophila+and+in+grasshopper+embryos.">Antibodies to horseradish peroxidase as specific neuronal markers in Drosophila and in grasshopper embryos.</a> Proc. Natl. Acad. Sci. 79 (8), 2700-2704 (1982).</li><li>Lahey, T., Gorczyca, M., Jia, X., Budnik, V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+Drosophila+tumor+suppressor+gene+dlg+is+required+for+normal+synaptic+bouton+structure.">The Drosophila tumor suppressor gene dlg is required for normal synaptic bouton structure.</a> Neuron. 13 (4), 823-835 (1994).</li></ol>

The neuronal mechanical injury described earlier and demonstrated here can be used to induce injury/stress in the segmental nerves of Drosophila larvae.4,5,6,14 This experimental technique has been employed previously to dissect the temporal sequence of events leading to neurodegeneration, as well as to examine transcriptional changes in the motor neuron cell bodies post injury.<sup cl...

Neuronal degeneration occurs during normal development and can be caused by the natural aging process, injury, stress, or disease states. Drosophila melanogaster, the common fruit fly, provides a simple and powerful model organism to study neurodegeneration due to the remarkable similarities in the molecular mechanisms that drive the degeneration of neurons. These similarities are highlighted by the fact that approximately 70% of disease-associated human genes have a Drosophila homolog.1 Additionally, numerous assays and technological tools to study human neurodegenerative diseases have been developed and utilized in Drosophila.2,3 Within Drosophila, the neuromuscular junction (NMJ) allows for analysis of both cellular and electrophysiological properties and has proven to be an important system to study neuromuscular disease due to the visible neuron-muscle connections.2 In this study, we describe an in vivo neuron injury assay in Drosophila larvae which allows for the reproducible injury of segmental nerves. This motoneuron injury results in a temporal sequence of cellular events resulting in neurodegeneration at the NMJ 24 h&#160;post injury. The ability to reproducibly injury motoneurons resulting in neurodegeneration has diverse applications such as identifying specific genes required for the degenerative process, the dissection of transcriptional responses to neuronal injury, and the analysis of protective signaling cascades.4,5,6 This method has also been used in combination with microfluidics to study neuronal degeneration and regeneration in live animals.7
We utilize an established quantitative assay to examine motor neuron degeneration at the Drosophila NMJ after mechanical injury. This assay is based on the fact that loss of presynaptic membrane and proteins precedes the disassembly of the subsynaptic reticulum (SSR) characterized by the postsynaptic muscle membrane folds.8,9,10,11,12,13 This assay allows for the quantification of &#34;synaptic footprints&#34; where the pre-synaptic neuron has lost connection to the adjacent postsynaptic muscle. The degenerative process has been shown to be progressive throughout larval development12 and cannot be accounted for by altered synapse development or sprouting.8,9,10,11,12 The advantage of using mechanical injury over preexisting mutations is that it allows for dissection of the temporal sequence of cellular events leading up to neurodegeneration at the NMJ.13

<table>
	<tbody>
		<tr>
			<td>Micro-dissecting scissors</td>
			<td>Fine Science Tools</td>
			<td>15000-08</td>
			<td></td>
		</tr>
		<tr>
			<td>Dumont #3 Forceps</td>
			<td>Fine Science Tools</td>
			<td>11231-30</td>
			<td>Some people prefer size 3, while others prefer size 5</td>
		</tr>
		<tr>
			<td>Dumont #5 Forceps</td>
			<td>Fine Science Tools</td>
			<td>11251-30</td>
			<td>Some people prefer size 3, while others prefer size 5</td>
		</tr>
		<tr>
			<td>CO2 Air Tank</td>
			<td>Tech Air</td>
			<td>UN 1013</td>
			<td>Various tank sizes can be purchased/</td>
		</tr>
		<tr>
			<td>CO2 Anesthetizing Apparatus</td>
			<td>Genesee Scientific</td>
			<td>59-114</td>
			<td></td>
		</tr>
		<tr>
			<td>Stainless-steel pins, size 0.1</td>
			<td>Fine Science Tools</td>
			<td>26002-10</td>
			<td></td>
		</tr>
		<tr>
			<td>SylGard 184 Silicone Elastomer, Base and Curing Agent</td>
			<td>Dow Corning</td>
			<td>3097358-1004</td>
			<td>To pour dissecting plates</td>
		</tr>
		<tr>
			<td>Bouin&#39;s Solution</td>
			<td>Sigma</td>
			<td>HT 10132-1L</td>
			<td>Antibodies should be tested for their efficiency in Bouin&#39;s and PFA</td>
		</tr>
		<tr>
			<td>4% Paraformaldehyde in PBS</td>
			<td>Affymetrix</td>
			<td>FLY-8030-20</td>
			<td>Antibodies should be tested for their efficiency in Bouin&#39;s and PFA</td>
		</tr>
		<tr>
			<td>Dissecting Stereo MIcroscope</td>
			<td>AmScope</td>
			<td>SM-1BZ</td>
			<td></td>
		</tr>
		<tr>
			<td>Light Source</td>
			<td>AmScope</td>
			<td>HL150-AY-220V</td>
			<td></td>
		</tr>
		<tr>
			<td>anti- nc82 antibody</td>
			<td>Developmental Studies Hybridoma Bank</td>
			<td>nc82-s</td>
			<td></td>
		</tr>
		<tr>
			<td>anti-discs large antibody</td>
			<td>Developmental Studies Hybridoma Bank</td>
			<td>AF3</td>
			<td></td>
		</tr>
		<tr>
			<td>Alexa Fluor anti-horseradish peroxidase</td>
			<td>Jackson Immunoresearch</td>
			<td>123-545-021; 123-585-021; 123-605-021</td>
			<td>One can you Alexa Fluor&#174; 488, 594 or 647</td>
		</tr>
		<tr>
			<td>Flystuff Grape Juice Agar Premix</td>
			<td>Genesee Scientific</td>
			<td>47-102</td>
			<td></td>
		</tr>
		<tr>
			<td>Microscope slides</td>
			<td>Genesee Scientific</td>
			<td>29-101</td>
			<td></td>
		</tr>
		<tr>
			<td>Glass Coverslips</td>
			<td>Fisher Scientific</td>
			<td>12-545-87</td>
			<td></td>
		</tr>
		<tr>
			<td>Thermo Scientific Nalgene Utility Box</td>
			<td>Fisher Scientific</td>
			<td>03-484C</td>
			<td>Used to create humid chamber for larval recovery</td>
		</tr>
	</tbody>
</table>

a simple neuronal mechanical injury methodology to study drosophila motor neuron degeneration

The degeneration of neurons occurs during normal development and in response to injury, stress, and disease. The cellular hallmarks of neuronal degeneration are remarkably similar in humans and invertebrates as are the molecular mechanisms that drive these processes. The fruit fly, Drosophila melanogaster, provides a powerful yet simple genetic model organism to study the cellular complexities of neurodegenerative diseases. In fact, approximately 70% of disease-associated human genes have a Drosophila homolog and a plethora of tools and assays have been described using flies to study human neurodegenerative diseases. More specifically the neuromuscular junction (NMJ) in Drosophila has proven to be an effective system to study neuromuscular diseases because of the ability to analyze the structural connections between the neuron and the muscle. Here, we report on an in vivo motor neuron injury assay in Drosophila, which reproducibly induces neurodegeneration at the NMJ by 24 h. Using this methodology, we have described a temporal sequence of cellular events resulting in motor neuron degeneration. The injury method has diverse applications and has also been utilized to identify specific genes required for neurodegeneration and to dissect transcriptional responses to neuronal injury.

Using the procedure presented here, we have demonstrated that mechanical neuronal injury allows for temporal dissection of neurodegenerative events.14,18 The sequence of events has been previously characterized and begins with an immediate disruption of the cytoskeleton, followed by axonal trafficking defects, an accumulation of ubiquitinated proteins, and subsequent neurodegeneration 24 h post-injury. Prior to injury, WT NMJs sho...

Watch this Scientific Journal Video about A Simple Neuronal Mechanical Injury Methodology to Study Drosophila Motor Neuron Degeneration at JoVE.com

A Simple Neuronal Mechanical Injury Methodology to Study Drosophila Motor Neuron Degeneration

Here we describe a simple and widely accessible method to injure segmental nerves in Drosophila larvae to visualize and quantify neurodegeneration of motor neurons at the neuromuscular junction (NMJ) of third instar larvae.

A Simple Neuronal Mechanical Injury Methodology to Study Drosophila Motor Neuron Degeneration

The degeneration of neurons occurs during normal development and in response to injury, stress, and disease. The cellular hallmarks of neuronal ...

The overall goal of this procedure is to induce mechanical injury of motor neurons in Drosophila larvae. This method can help answer key questions in the field of neurodegenerative research such as the temporal sequence of cellular events leading to neurodegeneration. The main advantages of this technique are that it is inexpensive and uses equipment that most Drosophila labs already have.The implications of this technique extend towards the understanding of the molecular mechanisms that drive neurodegeneration. To begin the protocol, select 10 second or third instar larvae from a vial or bottle of Drosophila containing wandering third instar larvae that have been cultured at 25 degrees Celsius. Use forceps to carefully pick individual larvae up by forceps or a paintbrush without compressing them.Directly place the 10 larvae into a glass dish containing cold 1x PBS to remove any food debris and to decelerate larval motility. Identify third instar larvae by their anterior branch spiracles and second instar larvae by their smaller size and club-like anterior spiracles. Place each larva onto a CO2 anesthetizing apparatus.Under a dissecting microscope, carefully roll each larva onto its dorsal side to visualize the segmental nerves throughout the cuticle. It is essential to carefully roll each larva onto their dorsal side in order to visualize the segmental nerves through the cuticle before injury. Starting at the mouth hooks, position size 5 forceps approximately one-half to two-thirds of the way down the length of the larva.Once positioned, pinch approximately one-third of the ventral cuticle containing the segmental nerves with size 5 foreceps. To ensure that larval segmental nerves are injured, apply sufficient force to crush the segmental nerves but leave the cuticle intact. To determine the correct amount of force, crush 10 larvae and insure the death rate after five hours is under 50%After injury, carefully transfer the larvae to a fruit juice agar plate containing approximately 0.5 grams of yeast paste.Place each larva so its anterior end is on the yeast paste for continued feeding. Place agar plates containing yeast paste and 10 injured larvae onto the bottom of an empty 100 by 15 millimeter Petri dish. Cover the Petri dish with a moist paper towel, ensuring that the paper towel does not touch the larvae or the agar plates.Then place the Petri dish into an airtight container at room temperature. Finally, retrieve larvae for dissection after specified periods post-injury. Prior to injury, wild-type neuromuscular junctions, or NMJs, show the presynaptic active zone marker Brp in apposition to the postsynaptic marker Dlg throughout the entire NMJ.Mechanical injury of segmental nerves can induce moderate to severe neurodegeneration in which butons stained with Dlg now lack the presynaptic active zone protein Brp. After its development, this technique paved the way for researchers studying neuronal injury to explore the temporal sequence of cellular events leading to the neurodegeneration at the neuromuscular junction in Drosophila.

Research

JoVE Journal

Neuroscience

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The Neuromuscular Junction: Measuring Synapse Size, Fragmentation and Changes in Synaptic Protein Density Using Confocal Fluorescence Microscopy

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Why Quantification Matters: Characterization of Phenotypes at the Drosophila Larval Neuromuscular Junction

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

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

Assay to Measure Nucleocytoplasmic Transport in Real Time within Motor Neuron-like NSC-34 Cells

Nucleocytoplasmic transport refers to the import and export of large molecules from the cell nucleus. Recently, a number of studies have shown a ...

In Vivo Electrophysiological Measurement of Compound Muscle Action Potential from the Forelimbs in Mouse Models of Motor Neuron Degeneration

In Vivo Electrophysiological Measurement of Compound Muscle Action Potential from the Forelimbs in Mouse Models of Motor Neuron Degeneration

Assessing the functionality of the nerve axon provides detailed information on the progression of neuromuscular disorders. Electrophysiological recordings ...

3D Kinematic Analysis for the Functional Evaluation in the Rat Model of Sciatic Nerve Crush Injury

Compared to the Sciatic Functional Index (SFI), kinematic analysis is a more reliable and sensitive method for performing functional evaluations of ...