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Updated: Jul 14, 2026
Pentylenetetrazole-Induced Kindling Mouse Model
Published on: June 12, 2018
Mirtazapine does not affect pentylenetetrazole- and maximal electroconvulsive shock-induced seizures in mice
Ismail Yilmaz1, Zafer Sezer, Hakan Kayir
1Psychopharmacology Research Unit, Department of Medical Pharmacology, Gulhane Military Medical Academy, Ankara, Turkey.
Abstract:
Mirtazapine is an antidepressant exhibiting both noradrenergic and serotonergic activity. We have investigated the effects of mirtazapine on pentylenetetrazole (PTZ)- and maximal electroconvulsive shock (MES)-induced seizures in mice. Mirtazapine (1.25-20mg/kg) or saline was administered, and locomotor activity was evaluated for 30 min. One hour after administration of mirtazapine (1.25-5mg/kg) or saline, PTZ (80 mg/kg) was injected intraperitoneally into the mice. Immediately afterward, times of onset of the first myoclonic jerk (FMJ), generalized clonic seizures (GCS), and tonic extension (TE) were recorded. In the MES groups, we used the MES protocol to induce convulsions characterized by tonic hindlimb extension. Similarly, 1h after mirtazapine or saline administration, an electroshock was evoked by ear-clip electrodes to induce convulsion. Mirtazapine, at 10 and 20 mg/kg, depressed locomotor activity. Doses of 1.25-5mg/kg had no significant effect on the time of onset of FMJ, GCS, or TE induced by PTZ; on the duration of GCS and TE; or on the latency to reinstatement of the righting reflex after MES administration. Our results suggest that mirtazapine neither aggravates nor alleviates PTZ- or MES-induced seizures in mice.
Insights
Mirtazapine, an antidepressant, did not significantly alter pentylenetetrazole (PTZ)- or maximal electroshock seizure (MES)-induced seizures in mice. This study indicates mirtazapine has no pro- or anti-convulsant effects in these seizure models.
Area of Science:
- Neuroscience
- Pharmacology
- Antidepressant Research
Background:
- Mirtazapine is an antidepressant with noradrenergic and serotonergic activity.
- Antidepressants can influence seizure susceptibility.
- Understanding mirtazapine's impact on seizures is crucial for patient safety.
Purpose of the Study:
- To investigate the effects of mirtazapine on PTZ- and MES-induced seizures in a mouse model.
- To determine if mirtazapine possesses pro-convulsant or anti-convulsant properties.
Main Methods:
- Mice were administered mirtazapine (1.25-20mg/kg) or saline.
- Locomotor activity was assessed.
- Seizures were induced using pentylenetetrazole (PTZ) or maximal electroshock (MES).
- Seizure parameters including onset, duration, and recovery were recorded.
Main Results:
- Mirtazapine at 10 and 20 mg/kg reduced locomotor activity.
- Lower doses (1.25-5mg/kg) did not significantly affect seizure onset, duration, or recovery time in either PTZ- or MES-induced seizures.
- Mirtazapine did not alter the time to first myoclonic jerk, generalized clonic seizures, or tonic extension.
Conclusions:
- Mirtazapine does not appear to aggravate or alleviate PTZ- or MES-induced seizures in mice.
- The antidepressant mirtazapine shows neither pro- nor anti-convulsant activity in these specific seizure models.
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