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Updated: May 25, 2026
Pentylenetetrazole-Induced Kindling Mouse Model
Published on: June 12, 2018
Effect of medroxyprogesterone on development of pentylenetetrazole-induced kindling in mice
S A Nasir1, A Sharma, R Khanam
1Neurobehavioral Pharmacology Laboratory, Department of Pharmacology, Faculty of Pharmacy, Hamdard University, New Delhi 110062, India.
Abstract:
In the present study, the effect of medroxyprogesterone (MPA) is evaluated for its effect on pentylenetetrazole (PTZ) kindling model of epileptogenesis in mice followed by evaluation on kindling-induced changes in cognitive and motor functions. To explore whether the effects are mediated via progesterone receptors, a selective antagonist of progesterone (mifepristone, MIF) was also taken. Kindling was induced by once every 2 days treatment with PTZ (25 mg/kg, i.p.) for 5 weeks. The seizure severity during induction of kindling and % incidence of animals kindled at the end of 5 weeks were recorded. The motor function was assessed using a grip strength meter, whereas spatial memory was assessed in a cross maze. MPA (5 and 10 mg/kg, i.p.) significantly reduced the seizure severity scores and produced a significant decrease in the incidence of animals kindled at the end of 5 weeks (P<0.01). A higher efficacy was observed against male mice as compared with females following MPA. MIF neither reduced nor delayed the development of PTZ-induced kindling in mice. Also, it couldn't reverse the antiepileptogenic effects of MPA. On grip strength test (GST) and spontaneous alternation behavior (SAB), a significant decline in GST and % alternation was observed in kindled mice which was reversed by pre-treatment with MPA. MIF, however, could reverse only the reduced % alternation and not grip strength (GS) in PTZ-kindled animals. The study shows that MPA has antiepileptogenic effects against development of PTZ-induced kindling in mice that may not be mediated via progesterone receptors.
Insights
Medroxyprogesterone (MPA) demonstrates antiepileptogenic effects against pentylenetetrazole (PTZ)-induced seizures in mice, improving motor and cognitive functions. These beneficial effects may not be mediated through progesterone receptors.
Area of Science:
- Neuroscience
- Pharmacology
- Epilepsy Research
Background:
- Epileptogenesis is a complex process involving neuronal network alterations.
- Progesterone and its analogs are being investigated for potential neuroprotective and antiepileptic properties.
- Pentylenetetrazole (PTZ) is a widely used chemoconvulsant to induce seizure models in preclinical research.
Purpose of the Study:
- To evaluate the antiepileptogenic effects of medroxyprogesterone (MPA) in a pentylenetetrazole (PTZ)-induced kindling model in mice.
- To assess the impact of MPA on PTZ-induced cognitive and motor deficits.
- To investigate the potential involvement of progesterone receptors in MPA's effects using mifepristone (MIF), a selective progesterone antagonist.
Main Methods:
- Kindling was induced in mice using repeated PTZ administration over 5 weeks.
- Seizure severity and incidence were recorded during PTZ kindling.
- Motor function was assessed using a grip strength test (GST).
- Spatial memory was evaluated using a cross maze, measuring spontaneous alternation behavior (SAB).
- Mice were treated with MPA alone, MIF alone, or MPA in combination with MIF.
Main Results:
- MPA significantly reduced seizure severity and the incidence of kindling in a dose-dependent manner.
- MPA treatment improved motor function (grip strength) and spatial memory (spontaneous alternation) in kindled mice.
- Mifepristone (MIF) did not affect PTZ-induced kindling development or reverse MPA's antiepileptogenic effects.
- MIF partially reversed the cognitive deficits but not the motor deficits induced by PTZ kindling.
Conclusions:
- Medroxyprogesterone (MPA) exhibits significant antiepileptogenic properties in the PTZ kindling model.
- MPA ameliorates PTZ-induced motor and cognitive impairments.
- The antiepileptogenic effects of MPA in this model appear to be independent of progesterone receptors.
