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    Please use this identifier to cite or link to this item: https://ir.fy.edu.tw:8080/ir/handle/987654321/8317


    Title: Stimulatory actions of thymol, a natural product, on Ca(2+)-activated K(+) current in pituitary GH(3) cells.
    Authors: HUANG Mei-Han;WU Sheng-Nan;SHEN Ai-Yu
    Contributors: 輔英科技大學 醫學檢驗生物技術系
    Keywords: Endocrine gland;Plant origin;Medicinal plant;Pharmacognosy;In vitro;Pituitary gland
    Date: 2005-12-01
    Issue Date: 2010-10-27
    Abstract: Drugs that influence the opening of potassium (K+) channels and as a consequence cause hyperpolarization of cell membrane possess clinical potential. The large conductance Ca2+-activated K+ (BK) channel is highly selective for K+. Activation of this channel is Ca2+- and voltage-dependent. We have investigated the effects of thymol, a natural product, on ion currents in pituitary GH3 cells. The patch-clamp technique was used to investigate the effect of thymol (100 μM) in these cells. Thymol reversibly stimulated the Ca2+-activated K+ current with an EC50 value of 75 pM. In a cell-attached configuration, application of thymol to the bath increased the activity of BK channels. BAPTA (1 mM) attenuated thymol-stimulated channel activity. In an experiment using the inside-out configuration, thymol exposed to the intracellular face of excised patches did not modify the single-channel conductance of these channels whereas it enhanced the channel activity. Neither menthol (100 μM) nor zingerone (100 μM) had an effect on BK-channel activity while AAPH (100 μM) suppressed it significantly. The stimulatory actions of thymol on Ca2+-activated K+ currents may be associated with the underlying cellular mechanisms through which it affects neuronal or neuroendocrine functions.
    Relation: Planta Med. 71(12),1093-1098
    Appears in Collections:[醫學檢驗生物技術系] 期刊論文

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