Related Experiment Videos
Seizure control following administration of anticonvulsant drugs in the quaking mouse
Abstract:
The effectiveness of a variety of clinical anticonvulsant drugs was evaluated in the quaking mutant mouse model of epilepsy. In this model, tonic-clonic seizures are easily elicited by handling and the effects of administration of carbamazepine (CBZ), phenytoin (DPH), phenobarbital (PB), diazepam, valproic acid (VPA) and ethosuximide were quantitatively evaluated. Chronic oral administration of CBZ, DPH and PB reduced the frequency of seizures and this was positively correlated with plasma levels of the drugs. The plasma levels of the 10,11-epoxide metabolite of CBZ were found to be approximately 3-5 times that of the parent compound with chronic oral administration. Acute intraperitoneal administration of the other drugs revealed VPA to be an effective anticonvulsant agent, whereas ethosuximide and diazepam were ineffective at dosage levels that are normally effective in mice as determined by classical testing methods such as electroshock and chemoshock. The results of the present study suggest that the quaking mouse may be a simple, reliable and inexpensive animal model for the evaluation of agents effective against focal motor seizures in humans.
Insights
The quaking mouse model effectively evaluated anticonvulsant drugs for epilepsy. Carbamazepine, phenytoin, and phenobarbital reduced seizure frequency, showing promise for focal motor seizure treatments.
Area of Science:
- Neuroscience
- Pharmacology
- Genetics
Background:
- Epilepsy is a neurological disorder characterized by recurrent seizures.
- The quaking (qk) mutant mouse exhibits a phenotype relevant to epilepsy, including tonic-clonic seizures.
- Evaluating anticonvulsant drug efficacy in relevant animal models is crucial for developing new treatments.
Purpose of the Study:
- To assess the effectiveness of various clinical anticonvulsant drugs in the quaking mouse model of epilepsy.
- To determine if the quaking mouse model can serve as a reliable platform for anticonvulsant drug screening.
Main Methods:
- Quaking mutant mice were used to model epilepsy.
- Drugs evaluated included carbamazepine (CBZ), phenytoin (DPH), phenobarbital (PB), diazepam, valproic acid (VPA), and ethosuximide.
- Seizure frequency was quantitatively measured following drug administration (chronic oral or acute intraperitoneal).
- Plasma drug levels and metabolite levels (CBZ epoxide) were analyzed.
Main Results:
- Chronic oral administration of CBZ, DPH, and PB reduced seizure frequency, correlating positively with plasma drug levels.
- The 10,11-epoxide metabolite of CBZ was found at higher concentrations than the parent drug with chronic oral administration.
- Valproic acid (VPA) was effective as an anticonvulsant via acute intraperitoneal administration.
- Ethosuximide and diazepam were ineffective at standard dosage levels in this model.
Conclusions:
- The quaking mouse model is a potentially valuable tool for evaluating anticonvulsant drugs.
- This model may be particularly useful for identifying agents effective against focal motor seizures.
- Drug efficacy in the quaking mouse model correlates with plasma drug concentrations, supporting its predictive value.