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Frequency-dependent inhibition of neuronal activity by lappaconitine in normal and epileptic hippocampal slices.

Abstract：

:1. Extracellular recording of the stimulus-evoked population spike in the CA1 region of rat hippocampal slices in vitro was performed in order to investigate whether lappaconitine affects neuronal excitability. Lappaconitine is a diterpene alkaloid of plants of the Aconitum genus and has analgesic properties. 2. The results reveal an inhibitory action of lappaconitine (10 microM) manifested in a slow attenuation of the orthodromic and antidromic population spike. 3. The lappaconitine-induced inhibitory action was activity-dependent, that is, it was potentiated when frequency of electrical stimulation was increased. In contrast, washout of the neurotoxin was accelerated when stimulation frequency was decreased. 4. The activity-dependent action of lappaconitine raised the question of whether the drug is effective in suppressing the aberrant neuronal activity that occurs during an epileptic seizure. The results obtained from experiments on epileptic hippocampal slices demonstrated a selective reduction of the later spikes in the bursts with less effect on normal neuronal activity. 5. These data support the conclusion that lappaconitine, in addition to its antinociceptive effect, also has antiepileptic potency due to its highly activity-dependent mode of action.

journal_name

Br J Pharmacol

journal_title

British journal of pharmacology

authors

Ameri A,Metzmeier P,Peters T

doi

10.1111/j.1476-5381.1996.tb15440.x

subject

Has Abstract

pub_date

1996-06-01 00:00:00

pages

577-84

issue

3

eissn

0007-1188

issn

1476-5381

journal_volume

118

pub_type

杂志文章

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