Proceedings of the Japan Academy, Series B
Online ISSN : 1349-2896
Print ISSN : 0386-2208
ISSN-L : 0386-2208
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Volume 87, Issue 10
Displaying 1-2 of 2 articles from this issue
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Review
  • Recollection of the early years of the research on cytochrome P450
    Tsuneo OMURA
    2011 Volume 87 Issue 10 Pages 617-640
    Published: December 09, 2011
    Released on J-STAGE: December 09, 2011
    DOIhttps://doi.org/10.2183/pjab.87.617
    JOURNAL FREE ACCESS
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    Since the publication of the first paper on “cytochrome P450” in 1962, the biochemical research on this novel hemoprotein expanded rapidly in the 1960s and the 1970s as its principal roles in various important metabolic processes including steroid hormone biosynthesis in the steroidogenic organs and drug metabolism in the liver were elucidated. Establishment of the purification procedures of microsomal and mitochondrial P450s in the middle of the 1970s together with the introduction of molecular biological techniques accelerated the remarkable expansion of the research on P450 in the following years. This review paper summarizes the important developments in the research on P450 in the early years, for about two decades from the beginning, together with my personal recollections.

    (Communicated by Masanori OTSUKA, M.J.A.)
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Original Article
  • Alteration in the plasma concentration of a DAAO inhibitor, 3-methylpyrazole-5-carboxylic acid, in the ketamine-treated rats and the influence on the pharmacokinetics of plasma D-tryptophan
    Naomi HARUTA, Hideaki IIZUKA, Kana ISHII, Shunsuke YOSHIHARA, Hideaki ...
    2011 Volume 87 Issue 10 Pages 641-648
    Published: December 09, 2011
    Released on J-STAGE: December 09, 2011
    DOIhttps://doi.org/10.2183/pjab.87.641
    JOURNAL FREE ACCESS
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    A determination method for 3-methylpyrazole-5-carboxylic acid (MPC), an inhibitor of D-amino acid oxidase (DAAO), in rat plasma was developed by using high-performance liquid chromatography-mass spectrometry (LC-MS). The structural isomer of MPC, 3-methylpyrazole-4-carboxylic acid, was used as an internal standard, and the intra- and inter-day accuracies and precisions were satisfactory for the determination of plasma MPC.
    Next, the LC-MS method was applied to determine the plasma MPC concentration in ketamine (Ket)-treated rats after intraperitoneal administration of MPC (5.0 or 50 mg·kg−1). The Cmax value of plasma MPC concentration in the Ket-treated rats was significantly higher than that in the control group when a high dose of MPC (50 mg·kg−1) was administered. In addition, it was found that plasma D-tryptophan (D-Trp) concentration in Ket-treated rats administered D-Trp was not significantly increased by MPC, suggesting that the DAAO-inhibitory effect of MPC is attenuated in Ket-treated rats.

    (Communicated by Masanori OTSUKA, M.J.A.)
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