Name: systemic pilocarpine treatment: mouse model of temporal lobe epilepsy
Uploaded: 2023-04-30T12:50:44.000+00:00
Duration: 1 min 16 s
Description: Source: Kim, J. E. and Cho, K. O. The Pilocarpine Model of Temporal Lobe Epilepsy and EEG Monitoring Using Radiotelemetry System in Mice. J. Vis. Exp. ...

systemic pilocarpine treatment: mouse model of temporal lobe epilepsy

Systemic Pilocarpine Treatment: Mouse Model of Temporal Lobe Epilepsy

Begin by weighing each 8-week-old male mouse. Make 2 milligrams per kilogram of scopolamine and terbutaline as well as 280 milligrams per kilogram of pilocarpine solution. Then, inject the solution intraperitoneally into each mouse and return the mice to their cages.
30 minutes after the scopolamine and terbutaline administration, inject pilocarpine solution into each mouse. Immediately after pilocarpine injection, place the mice in an incubator with 28 to 30 degrees Celsius for observation. Next, monitor the behavior of the mice until status epilepticus or SE is induced. If limbic motor seizures that correspond to stage 3 or higher according to Racine&#39;s scale are detected, record the time and monitor the mice.
Once continuous motor seizures last more than 2 minutes, place the mouse in a new cage at room temperature and keep monitoring for 3 hours to determine whether their convulsive seizures continue and SE is induced. Then, terminate behavioral acute seizures at 3 hours after SE onset by injecting 10 milligrams per kilogram of diazepam solution. After diazepam injection, administer 1 milliliter of 5% dextrose per individual mouse to help with recovery.
At day 1 after SE induction, weigh the mice and keep them in the incubator for one extra day. At day 2 after SE induction, weigh the mice and return them to their home cage. Provide moist food to facilitate recovery. Finally, measure daily body weight of the animals until 7 days post pilocarpine, and if the body weight has not increased, inject the mice with 5% dextrose.

systemic-pilocarpine-treatment-mouse-model-of-temporal-lobe-epilepsy

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All procedures involving animal models have been reviewed by the local institutional animal care committee and the JoVE veterinary review board.
1. SE Induction
<ol>
	<li>Purchase 8-week-old male C57BL/6NHsd mice and weigh each mouse. Then, use a marker pen to mark the tails of all mice for their easy identification during SE induction.</li>
	<li>Calculate the amount of scopolamine methyl bromide (scopolamine; 2 mg/kg), terbutaline hemisulfate (terbutaline; 2 mg/kg), and pilocarpine hydrochloride (pilocarpine; 280 mg/kg) based on the mouse weight and add saline (0.9% NaCl, 10 mL/kg) to make solutions. 
	NOTE:&#160;For example, if the weight of the mouse is 25 g, the following amounts are applied: Scopolamine and terbutaline: 2 mg/kg * (25 g/1,000 g) = 0.05 mg, Saline: 10 mL/kg * (25 g/1,000 g) = 0.25 mL, Pilocarpine: 280 mg/kg * (25 g/1,000 g) = 7 mg, Saline: 10 mL/kg * (25 g/1,000 g) = 0.25 mL.</li>
	<li>Load the scopolamine and terbutaline mixture in a 1 mL syringe with a 30 G needle. Inject the solution intraperitoneally into each mouse, and then return the mice to their cages. At 30 min after scopolamine and terbutaline administration, inject pilocarpine solution into each mouse (i.p.; 1 mL syringe; 30 G needle). Immediately after pilocarpine injection, place the mice in an incubator (28&#8211;30&#176;C) for observation.</li>
	<li>Carefully monitor the behavior of the mice until SE is induced. If limbic motor seizures that correspond to stage 3 or higher according to Racine&#39;s scale are detected, record the time and monitor the mice to determine whether the seizures occur more frequently. Once continuous motor seizures last more than 2 min, place the mouse in a new cage at room temperature and keep monitoring for 3 h to determine whether their convulsive seizures continue and SE is induced. Euthanize the mice that failed to enter SE at about 2 h after pilocarpine injection. 
	NOTE:&#160;Racine&#39;s scale; stage 1, mouth and facial movement; stage 2, head nodding; stage 3, forelimb clonus; stage 4, rearing with forelimb clonus; stage 5, rearing and falling with forelimb clonus. If the mouse is not transferred to the cage at room temperature immediately after SE induction, the mouse can die due to hyperthermia.</li>
	<li>Terminate behavioral acute seizures at 3 h after SE onset by injecting diazepam solution (i.p.; 10 mg/kg; 1 mL syringe; 30 G needle). Make the diazepam solution by diluting 5 mg/mL of diazepam in 10% polyoxyl 35 hydrogenated castor oil by adding saline (i.p.; 10 mL/kg; 1 mL syringe; 30 G needle).&#160; 
	NOTE:&#160;10% polyoxyl 35 hydrogenated castor oil solution: 1 mL polyoxyl 35 hydrogenated castor oil solution + 9 mL saline. Store the solution at room temperature. For example, if the mouse body weight is 25 g, inject 250 &#181;L of diazepam solution: 50 &#181;L 5 mg/mL diazepam + 200 &#181;L 10% polyoxyl 35 hydrogenated castor oil solution = 250 &#181;L 1 mg/mL diazepam.</li>
	<li>For sham mice, perform an i.p. injection of the scopolamine methyl bromide and terbutaline hemisulfate mixture (i.p.; both 2 mg/kg, 10 mL/kg; 1 mL syringe; 30 G needle). 30 min later, inject the saline intraperitoneally (i.p.; 10 mL/kg; 1 mL syringe; 30 G needle). 
	NOTE:&#160;If the mouse body weight is 25 g, inject 250 &#181;L of saline instead of pilocarpine.</li>
	<li>After diazepam injection (i.p.; 1 mL syringe; 30 G needle), administer 1 mL of 5% dextrose per individual mouse (i.p.; 1 mL syringe; 26 G needle). 
	NOTE:&#160;1 mL of 5% dextrose injection provides energy source and hydration that can increase the survival rate.</li>
	<li>During post-care in the incubator (28&#8211;30 &#176;C), wipe off excessive secretions such as saliva, tears, and feces.</li>
	<li>At day 1 after SE induction, weigh the mice and keep them in the incubator (28&#8211;30 &#176;C) for one extra day. At day 2, after SE induction, weigh the mice and return them to their home cage. Provide moist chow to facilitate their recovery. 
	NOTE:&#160;In this experiment, the mortality rate for C57BL/6NHsd after SE termination was 8.57% on average (3 out of 35 mice tested).</li>
	<li>Measure daily body weight of the animals until 7 days post-pilocarpine and inject the mice with 5% dextrose (i.p.; 1 mL syringe; 26 G needle) when the body weight has not increased. Stop body weight monitoring when the mice start to regain body weight and consume moist chow without difficulty at 2 days after pilocarpine injection. 
	NOTE:&#160;If the body weight of a mouse did not increase until 7 days post SE, exclude the mouse from the experiment and euthanize by carbon dioxide. Depending on the background of the mouse, death can occasionally occur; however, in the case of C57BL/6NHsd, less than 1% of mice died in these experiments. With survival of more than 7 days after SE induction, the mice rarely die during the latent period.</li>
</ol>

<table><tbody><tr><td>C57BL/6</td><td>Envigo</td><td>C57BL/6NHsd</td><td></td></tr><tr><td>Scopolamine methyl nitrate</td><td>Sigma</td><td>S2250</td><td>Make 10X stock</td></tr><tr><td>Terbutaline hemisulfate salt</td><td>Sigma</td><td>T2528</td><td>Make 10X stock</td></tr><tr><td>Pilocarpine hydrochloride</td><td>Sigma</td><td>P6503</td><td></td></tr><tr><td>Diazepam</td><td>SAMJIN</td><td></td><td></td></tr><tr><td>Castor oil (Kolliphor EL)</td><td>Sigma</td><td>C5135</td><td>Polyoxyl 35 hydrogenated castor oil</td></tr><tr><td>Saline</td><td>Daihan pharm. Co.</td><td></td><td></td></tr><tr><td>5% Dextrose</td><td>Daihan pharm. Co.</td><td></td><td></td></tr><tr><td>1 mL syringe</td><td>Sung shim medial Co.&amp;nbsp; Ltd.</td><td></td><td></td></tr><tr><td>26 guage needle</td><td>Sung shim medial Co.&amp;nbsp; Ltd.</td><td></td><td>26 G * 13 mm (1/2&quot;)</td></tr><tr><td>30 guage needle</td><td>Sung shim medial Co.&amp;nbsp; Ltd.</td><td></td><td>30 G * 13 mm (1/2&quot;)</td></tr></tbody></table>

Source: Kim, J. E. and Cho, K. O. <a href="https://www.jove.com/video/56831/the-pilocarpine-model-temporal-lobe-epilepsy-eeg-monitoring-using">The Pilocarpine Model of Temporal Lobe Epilepsy and EEG Monitoring Using Radiotelemetry System in Mice</a>. J. Vis. Exp. (2018).
This video presents the procedure for inducing status epilepticus (SE) in mice by systemic administration of pilocarpine to model temporal lobe epilepsy.

Source: Kim, J. E. and Cho, K. O. The Pilocarpine Model of Temporal Lobe Epilepsy and EEG Monitoring Using Radiotelemetry System in Mice. J. Vis. Exp. ...

To begin, administer an injection of scopolamine and terbutaline solution to minimize the peripheral side effects of pilocarpine. Next, administer an injection of pilocarpine solution to induce status epilepticus or SE. Pilocarpine will alter the brain&#39;s neuronal excitability.
Immediately after that, place the mouse in a warm incubator and monitor for induction of SE. Look for head nodding and rhythmic movements of the front legs or any behavior of stage 3 or higher on the Racine&#39;s scale. Then, place the mouse into a room temperature incubator and continue to monitor the animal&#39;s behavior.
Next, administer an injection of diazepam solution to end SE. Lastly, administer an injection of dextrose solution to aid with the animal&#39;s recovery. Following SE induction, the animal enters a seizure-free latent period until the onset of spontaneous recurrent seizures.

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Systemic Pilocarpine Treatment: Mouse Model of Temporal Lobe Epilepsy

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Systemic Pilocarpine Treatment: Mouse Model of Temporal Lobe Epilepsy