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Metabolites identification and multi-component pharmacokinetics of ergostane and lanostane triterpenoids in the anticancer mushroom Antrodia cinnamomea.

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      Abstract

      Antrodia cinnamomea is a precious medicinal mushroom popularly used for adjuvant cancer therapy in Taiwan. Its major bioactive constituents are ergostane and lanostane triterpenoids. Although clinical trials for A. cinnamomea have been recently initiated, its metabolism remains unclear. The present study aims to elucidate the metabolism and pharmacokinetics of A. cinnamomea in rats. After oral administration of an ethanol extract, 18 triterpenoids and 8 biotransformed metabolites were detected in rats plasma by UHPLC/qTOF-MS. Four of the metabolites were prepared by semi-synthesis and fully identified by NMR, while the others were tentatively characterized by comparing with the metabolites of single compounds (antcins B, C, H and K). Furthermore, a multi-component pharmacokinetic study of A. cinnamomea was carried out to monitor the plasma concentrations of 14 triterpenoids (ergostanes 1-3, 5-8, 14-16; lanostanes 9, 10, 17, 19) and 2 metabolites (M5, M6) by LC/MS/MS in rats after oral administration of the ethanol extract (1.0 g/kg). The results showed that ergostanes and Δ(7,9(11)) lanostanes, but not Δ(8) lanostanes, could get into circulation. The low-polarity ergostanes (antcins B and C) undertook hydrogenation (C-3 or C-7 carbonyl groups) or hydroxylation to produce polar metabolites. High-polarity ergostanes (antcins H and K) and Δ(7,9(11)) lanostanes were metabolically stable. We also discovered that ergostanes and lanostanes showed remarkably different pharmacokinetic patterns. The ergostanes were generally absorbed and eliminated rapidly, whereas the lanostanes remained in the plasma at a low concentration for a relatively long time. The results indicate that high-polarity ergostanes are the major plasma-exposed components of A. cinnamomea, and may play an important role in its therapeutic effects.

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      Affiliations
      [1 ] State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, 38 Xueyuan Road, Beijing 100191, China.
      [2 ] Agilent Technologies, 3 Wangjing North Road, Beijing 100102, China.
      [3 ] Institute of Biochemical Sciences and Technology, Chaoyang University of Technology, Taichung 41349, Taiwan.
      [4 ] State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, 38 Xueyuan Road, Beijing 100191, China. Electronic address: yemin@bjmu.edu.cn.
      Journal
      J Pharm Biomed Anal
      Journal of pharmaceutical and biomedical analysis
      1873-264X
      0731-7085
      2015
      : 111
      25912848 S0731-7085(15)00240-X 10.1016/j.jpba.2015.04.010
      Copyright © 2015 Elsevier B.V. All rights reserved.

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