Involvement of Interleukin-1 in Lead Nitrate-Induced Hypercholesterolemia in Mice
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概要
- 論文の詳細を見る
Hepatic 3-hydroxy-3-methylglutaryl-CoA reductase (HMGR) and cholesterol 7α-hydroxylase (Cyp7a1) are rate-limiting enzymes for cholesterol biosynthesis and catabolism, respectively. Involvement of inflammatory cytokines, particularly interleukin-1 (IL-1), in alterations of HMGR and Cyp7a1 gene expression during development of lead nitrate (LN)-induced hypercholesterolemia was examined in IL-1α/β-knockout (IL-1-KO) and wild-type (WT) mice. Lead nitrate treatment of WT mice led to not only a marked downregulation of the Cyp7a1 gene at 6—12 h, but also a significant upregulation of the HMGR gene at 12 h. However, such changes were not observed at significant levels in IL-1-KO mice, although a slight, transient downregulation of the Cyp7a1 gene and a minimal upregulation of the HMGR gene occurred at 6 h and 24 h, respectively. Consequently, LN treatment led to development of hypercholesterolemia at 24 h in WT mice, but not in IL-1-KO mice. Furthermore, in WT mice, significant LN-mediated increases were observed at 3—6 h in hepatic IL-1 levels, which can modulate gene expression of Cyp7a1 and HMGR. These findings indicate that, in mice, LN-mediated increases in hepatic IL-1 levels contribute, at least in part, to altered expressions of Cyp7a1 and HMGR genes, and eventually to hypercholesterolemia development.
著者
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ASHINO TAKASHI
Department of Biochemical Toxicology, School of Pharmaceutical Sciences, Showa University
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Yoshida Takemi
Department Of Biochemical Toxicology School Of Pharmaceutical Science Showa University
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Degawa Masakuni
Department Of Hygienic Chemistry Faculty Of Pharmaceutical Sciences Tohoku University
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Kojima Misaki
Animal Genome Res. Unit Div. Of Animal Sciences National Inst. Of Agrobiological Sciences
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Ashino Takashi
Department Of Biochemical Toxicology School Of Pharmaceutical Sciences Showa University
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Iwakura Yoichiro
Center For Experimental Medicine And Systems Biology Inst. Of Medical Sci. The Univ. Of Tokyo
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Kojima Misaki
Animal Genome Research Unit, Agrogenomics Research Center, National Institute of Agrobiological Sciences
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YOSHIDA Takemi
Department of Biochemical Toxicology, School of Pharmaceutical Sciences, Showa University
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Iwakura Yoichiro
Center for Experimental Medicine and Systems Biology, Institute of Medical Science, The University of Tokyo
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Degawa Masakuni
Department of Molecular Toxicology and Global COE Program, School of Pharmaceutical Sciences, University of Shizuoka
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