Inhibitory effect of peony root extract on pentylenetetrazol-induced EEG power spectrum changes and extracellular calcium concentration changes in rat cerebral cortex.
To elucidate the mechanism of anticonvulsant action of peony root and to determine the relative contributions of pure component substances, the water, water/acetone and methanol extracts of peony roots, paeoniflorin, albiflorin and pentagalloylglucose were studied in rats using the EEG power spectrum changes induced by pentylenetetrazol administration and the extracellular calcium and potassium concentration changes related to seizure activity. The water extract of peony roots, albiflorin and pentagalloylglucose given orally completely inhibited the EEG power spectrum changes as well as the extracellular calcium and potassium concentration changes related to seizure activity. The water/acetone and methanol extracts and paeoniflorin were relatively less potent. These findings suggested that the anticonvulsant action of peony roots is due primarily to albiflorin and the gallotannin fraction. Albiflorin and pentagalloylglucose appear to manifest their anticonvulsant action due to inhibition of the seizure-related decrease of extracellular calcium and consequent intracellular calcium increase.
Faculty of Pharmaceutical Sciences, Josai University, Saitama, Japan.
A
A
Sugaya
T
T
Suzuki
E
E
Sugaya
N
N
Yuyama
K
K
Yasuda
T
T
Tsuda
D000818:Animals; D001565:Benzoates; D001952:Bridged-Ring Compounds / Q000494:pharmacology; D002118:Calcium / Q000378:metabolism*; D002540:Cerebral Cortex / Q000187:drug effects / Q000378:metabolism*; D004569:Electroencephalography; D005707:Gallic Acid / Q000031:analogs & derivatives / Q000494:pharmacology; D005947:Glucose / Q000031:analogs & derivatives / Q000494:pharmacology; D005960:Glucosides / Q000494:pharmacology; D008297:Male; D000432:Methanol; D039821:Monoterpenes; D010433:Pentylenetetrazole / Q000037:antagonists & inhibitors* / Q000494:pharmacology; D010936:Plant Extracts / Q000494:pharmacology; D010946:Plants, Medicinal / Q000737:chemistry*; D011188:Potassium / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D014867:Water; D006027:Glycosides
D001565:Benzoates; D001952:Bridged-Ring Compounds; D002118:Calcium; D005707:Gallic Acid; D005947:Glucose; D005960:Glucosides; D000432:Methanol; D039821:Monoterpenes; D010433:Pentylenetetrazole; D010936:Plant Extracts; D011188:Potassium; D014867:Water; C015423:peoniflorin; D006027:Glycosides; C014959:albiflorin; C058187:2,3,4,5,6-pentagalloylglucose