Inhibitory effect of the plant-extract osthole on L-type calcium current in NG108-15 neuronal cells

Sheng Nan Wu, Yuk Kang Lo, Chien Chich Chen, Hui Fang Li, Hung Ting Chiang

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25 Citations (Scopus)


The effects of osthole, a coumarin isolated from Cnidium monnieri (L.) Cusson, on ionic currents in a mouse neuroblastoma and rat glioma hybrid cell line, NG105-18, were investigated with the aid of the whole-cell voltage-clamp technique. Osthole (0.3-100μM) caused an inhibition of voltage-dependent L-type Ca2+ current (ICa,L) in a concentration-dependent manner. Osthole produced no change in the overall shape of the current-voltage relationship of ICa,L. The IC50 value of the osthole-induced inhibition of ICa,L was 4μM. The presence of osthole (3μM) shifted the steady state inactivation curve of ICa,L to a more negative potential by approximately -15mV. Osthole (3μM) also produced a prolongation in the recovery of ICa,L inactivation. Although osthole might suppress phosophodiesterases to increase intracellular adenosine-3′,5′-cyclic monophosphate (cyclic AMP) or guanosine-3′,5′-cyclic monophosphate (cyclic GMP), sp-cAMPS did not affect ICa,L and 8-bromo-cyclic GMP slightly suppressed it. Thus, osthole-mediated inhibition of ICa,L was not associated with intracellular cyclic AMP or GMP. However, no effect of osthole on voltage-dependent K+ outward current was observed. Under a current-clamp mode, osthole could decrease the firing frequency of action potentials. Therefore, the channel-blocking properties of osthole may, at least in part, contribute to the underlying mechanisms by which it affects neuronal or neuroendocrine function.

Original languageEnglish
Pages (from-to)199-206
Number of pages8
JournalBiochemical Pharmacology
Issue number2
Publication statusPublished - 2002 Jan 15

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Pharmacology


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