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Effects of manganese, calcium, magnesium and lithium on the ouabain-induced seizure
Abstract:
The effects of the intraventricularly administered cations (Mn2+, Ca2+, Mg2+ and Li+) against the seizure induced by ouabain (3 microgram) were investigated. Mn2+, Ca2+ and Mg2+ caused definite sedation and decreased locomotor activity. But Li+ was without significant behavioral effect at the doses applied. Among the cations used, Mn2+, Ca2+ and Mg2+ showed significant anticonvulsive effect on the ouabain-induced seizure. In comparison, on the dose and molar-to-molar basis, the potency of anticonvulsive action was in the following order: Mn2+ greater than Ca2+ greater than Mg2+. On the contrary, the higher dose of Li+ potentiated the ouabain-induced seizure. The importance of the increased Ca2+ level in the extracellular space or the inhibition of Ca2+ uptake as the anticonvulsive effect of Ca2+, Mn2+ and Mg2+ was discussed.
Insights
Manganese (Mn2+), calcium (Ca2+), and magnesium (Mg2+) ions demonstrated significant anticonvulsant effects against ouabain-induced seizures. Lithium (Li+) ions, however, potentiated seizures at higher doses.
Area of Science:
- Neuropharmacology
- Neuroscience
- Biochemistry
Background:
- Seizures are a significant neurological disorder with complex underlying mechanisms.
- Cationic ion balance plays a crucial role in neuronal excitability and seizure threshold.
- Ouabain is a cardiac glycoside that can induce seizures through inhibition of the Na+/K+-ATPase pump.
Purpose of the Study:
- To investigate the anticonvulsant effects of specific cations (Mn2+, Ca2+, Mg2+, Li+) administered intraventricularly.
- To compare the relative potencies of these cations in mitigating ouabain-induced seizures.
- To explore potential mechanisms underlying the observed anticonvulsant or proconvulsant activities.
Main Methods:
- Intraventricular administration of manganese (Mn2+), calcium (Ca2+), magnesium (Mg2+), and lithium (Li+) ions in a rodent model.
- Induction of seizures using a specific dose (3 micrograms) of ouabain.
- Behavioral observation, including assessment of sedation, locomotor activity, and seizure severity.
Main Results:
- Mn2+, Ca2+, and Mg2+ exhibited significant anticonvulsant effects against ouabain-induced seizures, with Mn2+ > Ca2+ > Mg2+ in potency.
- These effective cations also caused dose-dependent sedation and decreased locomotor activity.
- Higher doses of Li+ unexpectedly potentiated ouabain-induced seizures, indicating a proconvulsant effect.
Conclusions:
- Mn2+, Ca2+, and Mg2+ possess notable anticonvulsant properties, potentially mediated by mechanisms involving extracellular calcium levels or calcium uptake.
- The differential effects of cations highlight their specific roles in regulating neuronal excitability.
- Further research is warranted to elucidate the precise molecular mechanisms of these ionic effects on seizure activity.