ヒライシ　サユリ   Sayuri Hiraishi
  平石　さゆり
   所属   栄養科学研究所
   職種   専任講師
言語種別 英語
発行・発表の年月 2000
形態種別 学位論文（博士）
査読 査読あり
標題 Oxidized low-density lipoprotein impairs the anti-coagulant function of tissue-factor-pathway inhibitor through oxidative modification by its high association and accelerated degradation in cultured human endothelial cells.
執筆形態 共著
掲載誌名 Biochem. J.
巻・号・頁 352,pp.277-285
総ページ数 null
著者・共著者 Horie S, Hiraishi S, Hirata Y, Kazama M, Matsuda J
概要 We have examined whether oxidized low-density lipoprotein (ox-LDL) affects the function of tissue-factor-pathway inhibitor (TFPI), an anti-coagulant regulator in the extrinsic pathway of coagulation, in cultured human umbilical vein endothelial cells (HUVEC). Treatment of culture medium of HUVEC with ox-LDL, but not with native or acetylated LDLs, caused a rapid, concentration-dependent decrease in the functional activity of TFPI to inhibit Factor X activation. Ox-LDL decreased the antigen level of TFPI in the lysate of HUVEC in a time-dependent manner. It did not affect the mRNA level, but ox-LDL-dependent reduction of the TFPI antigen level in HUVEC was reversed by the simultaneous treatment of ox-LDL with bafilomycin A1, an inhibitor of the lysosomal proton pump. These results indicate that ox-LDL lessens the anti-coagulant function of TFPI through both oxidative modification and accelerated degradation of the molecule outside and inside HUVEC respectively.