<meta charset="utf8"></head><body>Système d’air de surpression personnalisé pour induire des lésions du SNC dans les modèles murins

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>1-Pentanol</td>
			<td>Fisher Scientific</td>
			<td>AC160600250</td>
			<td>Used to make Avertin solution&#160;</td>
		</tr>
		<tr>
			<td>2,2,2-tribomoethanol</td>
			<td>Sigma Aldrich</td>
			<td>T48402</td>
			<td>Used to make Avertin solution&#160;</td>
		</tr>
		<tr>
			<td>24-well plates with lid</td>
			<td>VWR</td>
			<td>76520-634</td>
			<td>24-well plate</td>
		</tr>
		<tr>
			<td>2-Propanol&#160;</td>
			<td>Fisher Scientific</td>
			<td>A451-1&#160;</td>
			<td></td>
		</tr>
		<tr>
			<td>50 kS/s/channel Bridge Analog Input Module&#160;</td>
			<td>National Instruments</td>
			<td>NI-9237</td>
			<td>DAQ module</td>
		</tr>
		<tr>
			<td>Albumin Bovine Fraction V (BSA)&#160;</td>
			<td>Research Products International&#160;</td>
			<td>A30075</td>
			<td>BSA</td>
		</tr>
		<tr>
			<td>Anti-Iba1 Primary Antibody (Goat polyclonal)&#160;</td>
			<td>Abcam&#160;</td>
			<td>ab5076</td>
			<td>Marker for microglia, Used at 1:500 concentration&#160;</td>
		</tr>
		<tr>
			<td>Anti-Synaptophysin Primary Antibody (Mouse monoclonal)&#160;</td>
			<td>Abcam&#160;</td>
			<td>ab8049</td>
			<td>Marker for photoreceptor ribbon synapses, Used at 1:20 concentration</td>
		</tr>
		<tr>
			<td>Araldite GY 502&#160;</td>
			<td>Electron Microscopy Sciences</td>
			<td>10900</td>
			<td></td>
		</tr>
		<tr>
			<td>Cacodylate buffer</td>
			<td>Electron Microscopy Sciences</td>
			<td>11652</td>
			<td></td>
		</tr>
		<tr>
			<td>Charcoal Filter Canister</td>
			<td>E-Z Systems</td>
			<td>EZ-258</td>
			<td>Collection of anesthetic waste</td>
		</tr>
		<tr>
			<td>Clear H20 DietGel 76A</td>
			<td>Clear H2O&#160;</td>
			<td>72-07-5022</td>
			<td>Used post blast to aid animal recovery</td>
		</tr>
		<tr>
			<td>CompactDAQ Chassis</td>
			<td>National Instruments</td>
			<td>USB-9162</td>
			<td>DAQ chassis</td>
		</tr>
		<tr>
			<td>Compressed Air</td>
			<td>A-L Gas</td>
			<td>GSMCA300&#160;</td>
			<td>Used to refill pressurized air tank</td>
		</tr>
		<tr>
			<td>DAPI Fluoromount-G&#160;</td>
			<td>Southern Biotech</td>
			<td></td>
			<td>Mounting media with DAPI</td>
		</tr>
		<tr>
			<td>Diamond knife</td>
			<td>Micro Star Technologies, Group of Bruker Nano, Inc.&#160;</td>
			<td></td>
			<td>For sectioning optic nerves, 3 mm/45 degrees/Style H&#160;</td>
		</tr>
		<tr>
			<td>Donkey Anti-Goat IgG (H+L) High Cross Adsorbed Secondary Antibody, Alex Fluor 594</td>
			<td>Invitrogen (Supplier: Fisher Scientific)</td>
			<td>A-11058</td>
			<td>Secondary antibody for microglia, Used at 1:200 concentration</td>
		</tr>
		<tr>
			<td>Donkey Anti-Mouse IgG (H+L) High Cross Adsorbed Secondary Antibody, Alex Fluor 594</td>
			<td>Invitrogen (Supplier: Fisher Scientific)</td>
			<td>A-21203</td>
			<td>Secondary antibody for photoreceptor ribbon synapses, Used at 1:200 concentration</td>
		</tr>
		<tr>
			<td>Donkey Anti-Rabbit IgG (H+L) High Cross Adsorbed Secondary Antibody, Alex Fluor 488</td>
			<td>Invitrogen (Supplier: Fisher Scientific)</td>
			<td>A-21206</td>
			<td>Secondary antibody for rod bipolar cells, Used at 1:200 concentration&#160;</td>
		</tr>
		<tr>
			<td>Donkey Serum&#160;</td>
			<td>Sigma Aldrich&#160;</td>
			<td>D9662</td>
			<td>NDS</td>
		</tr>
		<tr>
			<td>Dumont #3 Forceps</td>
			<td>Fine Science Tools</td>
			<td>11231-30</td>
			<td>Fine forceps for whole eye enucleation&#160;</td>
		</tr>
		<tr>
			<td>Ethanol (200 proof)&#160;</td>
			<td>KOPTEC (Supplier: VWR)&#160;</td>
			<td>89125-188</td>
			<td>Ethanol&#160;</td>
		</tr>
		<tr>
			<td>Fluoromount-G&#160;</td>
			<td>Invitrogen (Supplier: Fisher Scientific)</td>
			<td>00-4958-02</td>
			<td>Mounting media</td>
		</tr>
		<tr>
			<td>Genteal Tears Ophthalmic Gel</td>
			<td>Covetrus</td>
			<td>72359</td>
			<td>Eye lubricant to prevent eyes from drying out during/after anesthesia&#160;</td>
		</tr>
		<tr>
			<td>Glutaraldehyde</td>
			<td>Electron Microscopy Sciences</td>
			<td>16200</td>
			<td></td>
		</tr>
		<tr>
			<td>Graduated Cylinder 1000 mL</td>
			<td>Fisher Scientific</td>
			<td>08-572G</td>
			<td></td>
		</tr>
		<tr>
			<td>Graduated Cylinder 250 mL</td>
			<td>Fisher Scientific</td>
			<td>08-572E</td>
			<td></td>
		</tr>
		<tr>
			<td>Graduated Cylinder 500 mL</td>
			<td>Fisher Scientific</td>
			<td>08-572F</td>
			<td></td>
		</tr>
		<tr>
			<td>Heating pad&#160;</td>
			<td>Braintree Scientific</td>
			<td>AP-R 26E</td>
			<td>Controlled heating support</td>
		</tr>
		<tr>
			<td>High Pressure Fill Station</td>
			<td>Ninja Paintball</td>
			<td>HPFSV2</td>
			<td>Used to refill pressurized air tank</td>
		</tr>
		<tr>
			<td>ImageJ</td>
			<td>National Institutes of Health&#160;</td>
			<td></td>
			<td>Image analysis software</td>
		</tr>
		<tr>
			<td>Invert Mini</td>
			<td>Empire Paintball</td>
			<td></td>
			<td>Paintball gun</td>
		</tr>
		<tr>
			<td>Isoflurane</td>
			<td>Covetrus</td>
			<td>29405</td>
			<td>Inhalation anesthetic</td>
		</tr>
		<tr>
			<td>Isoflurane Vaporizer</td>
			<td>VetEquip</td>
			<td>901806</td>
			<td>Animal anesthesia</td>
		</tr>
		<tr>
			<td>Masterflex Pump</td>
			<td>Cole-Parmer</td>
			<td></td>
			<td>Used for animal perfusion</td>
		</tr>
		<tr>
			<td>Methanol&#160;</td>
			<td>Sigma Aldrich</td>
			<td>322415-2L&#160;</td>
			<td></td>
		</tr>
		<tr>
			<td>Microscope Slides</td>
			<td>Globe Scientific</td>
			<td>1358W</td>
			<td>White glass microscope slides</td>
		</tr>
		<tr>
			<td>NI LabVIEW&#160;</td>
			<td>National Instruments</td>
			<td></td>
			<td>Software to acquire data from DAQ system (other examples include Matlab, Python, or other softwares provided by different DAQ hardware manufacturers)</td>
		</tr>
		<tr>
			<td>NI Measurement and Automation Explorer (NI MAX)&#160;</td>
			<td>National Instruments</td>
			<td></td>
			<td>Software to configure DAQ system settings</td>
		</tr>
		<tr>
			<td>NI-DAQmx drivers&#160;</td>
			<td>National Instruments</td>
			<td></td>
			<td>Driver for interacing with DAQ system&#160;</td>
		</tr>
		<tr>
			<td>Nikon Eclipse Ni-E microscope</td>
			<td>Nikon Instruments</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Osmium tetroxide 2%</td>
			<td>Electron Microscopy Sciences</td>
			<td>19152</td>
			<td></td>
		</tr>
		<tr>
			<td>Paraformaldehyde 32%</td>
			<td>Electron Microscopy Sciences</td>
			<td>15714-S</td>
			<td>PFA diluted down to 4%</td>
		</tr>
		<tr>
			<td>Paraphenylenediamine&#160;</td>
			<td>Sigma Aldrich</td>
			<td>P6001</td>
			<td></td>
		</tr>
		<tr>
			<td>PBS (10x), pH 7.4</td>
			<td>Thermo Fisher Scientific</td>
			<td>70011044</td>
			<td>PBS diluted down to 1x</td>
		</tr>
		<tr>
			<td>Propylene oxide&#160;</td>
			<td>Electron Microscopy Sciences</td>
			<td>20401</td>
			<td></td>
		</tr>
		<tr>
			<td>PROV3 48 L, 48 in3 Aluminum 3000 psi Rated Tank</td>
			<td>Ninja Paintball</td>
			<td></td>
			<td>Pressurized air tank</td>
		</tr>
		<tr>
			<td>Pyrex Reusable Media Storage Bottle 1000 mL</td>
			<td>Fisher Scientific</td>
			<td>06-414-1D</td>
			<td></td>
		</tr>
		<tr>
			<td>Pyrex Reusable Media Storage Bottle 500 mL</td>
			<td>Fisher Scientific</td>
			<td>06-414-1C</td>
			<td></td>
		</tr>
		<tr>
			<td>Pyrex Reusable Media Storage Bottles 250 mL</td>
			<td>Fisher Scientific</td>
			<td>06-414-1B</td>
			<td></td>
		</tr>
		<tr>
			<td>Recombinant Anti-PKC-a Primary Antibody (Rabbit monoclonal)&#160;</td>
			<td>Abcam&#160;</td>
			<td>ab32376</td>
			<td>Marker for rod bipolar cells, Used at 1:500 concentration&#160;</td>
		</tr>
		<tr>
			<td>Resin 812</td>
			<td>Electron Microscopy Sciences</td>
			<td>14900</td>
			<td></td>
		</tr>
		<tr>
			<td>Series TJE Pressure Transducer, 100 psi&#160;</td>
			<td>Honeywell&#160;</td>
			<td>060-0708-10TJG</td>
			<td>Consider the range when selecting pressure transducer to optimize resolution of measurements&#160;</td>
		</tr>
		<tr>
			<td>Sucrose</td>
			<td>Sigma Aldrich</td>
			<td>S5016</td>
			<td></td>
		</tr>
		<tr>
			<td>Super TJE Pressure Transducer, 7500 psi&#160;</td>
			<td>Honeywell&#160;</td>
			<td></td>
			<td>Consider the range when selecting pressure transducer to optimize resolution of measurements&#160;</td>
		</tr>
		<tr>
			<td>Syringe/Needle Combo</td>
			<td>Covetrus&#160;</td>
			<td>60728</td>
			<td>Syringe/Needle to perform IP injections</td>
		</tr>
		<tr>
			<td>Tissue-Plus OCT Compound</td>
			<td>Fisher Scientific</td>
			<td>23-730-571&#160;</td>
			<td>Freezing medium&#160;</td>
		</tr>
		<tr>
			<td>Toluidine blue</td>
			<td>Fisher Scientific</td>
			<td>BP107-10</td>
			<td></td>
		</tr>
		<tr>
			<td>Triton X-100</td>
			<td>Sigma Aldrich</td>
			<td>T8787</td>
			<td></td>
		</tr>
		<tr>
			<td>UniSlide XY Table</td>
			<td>Velmex&#160;</td>
			<td>AXY40 Series</td>
			<td>XY positioning table&#160;</td>
		</tr>
		<tr>
			<td>University Brush - Series 233- Round, Size 000</td>
			<td>Winsor and Newton&#160;</td>
			<td></td>
			<td>Paintbrush</td>
		</tr>
		<tr>
			<td>Vannas Spring Scissors - 2.5mm Cutting Edge</td>
			<td>Fine Science Tools</td>
			<td>15000-08</td>
			<td>Scissors for whole eye enucleation</td>
		</tr>
		<tr>
			<td>Virtual Instrument</td>
			<td>National Instruments&#160;</td>
			<td></td>
			<td>Digital tool for data acquisition software&#160;</td>
		</tr>
	</tbody>
</table>

system for focal, closed-system central nervous system injury

Closed-system central nervous system (CNS) injuries are injuries that are caused by damage to the brain or spinal cord without causing a break in the skull or spinal column. These injuries include traumatic brain injury (TBI) and spinal cord injury (SCI) and can occur from a variety of incidents, including blunt force injuries (e.g., falls, sports injuries, motor vehicle accidents) and explosive blasts. Closed-system CNS injuries are generally considered less severe compared to penetrating CNS injuries, yet they occur more often. However, similar to penetrating injuries, closed-system CNS injuries can result in long-term and progressive health issues, especially after repeated occurrences1,2,3,4,5,6. Concerningly, emerging evidence suggests that even subclinical closed-system CNS injuries, which fall below the diagnostic criteria for a TBI or SCI after a single occurrence7,8,9,10,11,12,13, may evolve into chronic neurodegenerative diseases after repeated injury6,14,15,16. This underscores the urgent need for a better understanding of the mechanisms and consequences of single and repeated closed-system CNS injuries.&#160; Such knowledge is imperative for improved protective and therapeutic approaches. Crucial to this endeavor are animal models that replicate closed-system CNS injuries.
Current animal models of closed-system CNS injuries have been instrumental in advancing our understanding of the pathophysiology and potential protective and therapeutic interventions for these traumas. Rodents are particularly popular due to their low cost, availability, genetic manipulability, ease of handling, well-established behavioral and physiological assays, and more favorable ethical considerations17. Common methods for inducing closed-system TBI in rodents include weight-drop devices18,19, controlled cortical impact (CCI) devices20, and compression-air-driven shock tubes21. For SCI, blunt trauma models typically require laminectomy22,23 or other surgical techniques24 to access the spinal cord or epidural space directly. However, closed-body SCI blast injury models have been developed using compression-air-driven shock tubes 25. Despite providing valuable insights, each of these models has unique limitations. Weight-drop models can have high variability and limited control of injury location and severity, producing experimental and ethical concerns for causing severe, uncontrolled injury26. CCI devices offer precision but require training to operate, may involve a craniotomy, and can suffer from mechanical variability impacting reproducibility27. Shock tubes are generally less invasive but can be difficult to acquire, complex to set up and operate, and can create unrealistic and highly variable injury conditions due to environmental factors, wave reflections, and complex pressure interactions28.
To better study the mechanisms and effects of single and repeat closed-system CNS injuries and their treatments, this paper presents a modular, user-friendly, cost-effective, and non-invasive method. The primary objective of this approach is to enable precise control and flexible modification of injury parameters, including location, severity, and timing. To support this objective, this manuscript provides a detailed protocol for constructing, calibrating, and troubleshooting an overpressure air system, which addresses some of the limitations of existing closed-system CNS injury devices. This system not only offers cost-effectiveness and minimal setup time, but it highly versatile, providing consistent and reproducible results while minimizing ethical concerns and maximizing clinical relevance. Additionally, the system&#8217;s ability to produce a range of closed-system CNS injuries in murine models is described, along with its potential applications in future studies. Notably, the goal of this manuscript is to provide a framework that enables investigators to easily acquire, adapt, and expand this system for their specific needs, thereby furthering ongoing research in CNS trauma. Representative results demonstrating the system&#8217;s efficacy in inducing axonal trauma are also presented.

<meta charset="utf8"></head><body>Pleins feux sur l’auteur : Développer des modèles précis et cliniquement pertinents pour l’étude de la dégénérescence secondaire dans la neuropathie optique trauma

Système pour lésion focale du système nerveux central en système fermé

The prevalence of closed-system central nervous system (CNS) injuries underscores the need for an enhanced understanding of these traumas to improve ...

system-for-focal-closed-system-central-nervous-system-injury

Research

JoVE Journal

Neuroscience

System for Focal, Closed-System Central Nervous System Injury

562 vues.  Vanderbilt University. Notre laboratoire explore les mécanismes contrôlant la dégénérescence secondaire après ITON, neuropathie optique traumatique indirecte, dans le but de développer des thérapies rationnelles pour les patients. À l’heure actuelle, les dispositifs permettant d’induire des lésions du SNC sur le terrain comprennent des dispositifs d’impact cortical contrôlés, des modèles de chute de poids et des tubes de choc à air comprimé. Nous avons constat?...

Vidéo: Pleins feux sur l’auteur : Développer des modèles précis et cliniquement pertinents pour l’étude de la dégénérescence secondaire dans la neuropathie optique trauma

The prevalence of closed-system central nervous system (CNS) injuries underscores the need for an enhanced understanding of these traumas to improve protective and therapeutic interventions. Crucial to this research are animal models that replicate closed-system CNS injuries. In this context, a custom overpressure air system was engineered to reproduce a range of closed-system CNS injuries in murine models, including ocular, brain, and spinal cord trauma. To date, the system has been used to administer eye-, head-, or spine-directed overpressure air to model anteroposterior pole injury in the eye, indirect traumatic optic neuropathy (ITON), focal traumatic brain injury, and spinal cord injury. This paper provides a detailed protocol outlining the system&#39;s design and operation and shares representative results demonstrating its effectiveness. The robust framework presented here provides a strong foundation for ongoing research in CNS trauma. By leveraging the system&#8217;s flexible attributes, investigators can modify and carefully control the location, severity, and timing of injuries. This allows for comprehensive comparisons of molecular mechanisms and therapeutic efficacy across multiple closed-system CNS injuries.

This protocol describes a custom overpressure air system designed to induce closed-system central nervous system (CNS) injuries in mice, including ocular, brain, and spinal cord traumas. The goal of this protocol is to provide a framework for researchers to easily adapt and expand the system for their unique CNS trauma studies.