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Effects of ML-236B (compactin) on sterol synthesis and low density lipoprotein receptor activities in fibroblasts of patients with homozygous familial hypercholesterolemia
http://hdl.handle.net/2297/7211
http://hdl.handle.net/2297/721112d2f7a4-c7be-41d5-865e-9228ddf5d59b
名前 / ファイル | ライセンス | アクション |
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ME-PR-MABUCHI-H-1532.pdf (661.2 kB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2017-10-03 | |||||
タイトル | ||||||
タイトル | Effects of ML-236B (compactin) on sterol synthesis and low density lipoprotein receptor activities in fibroblasts of patients with homozygous familial hypercholesterolemia | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Haba, Toshihiro
× Haba, Toshihiro× Mabuchi, Hiroshi× Yoshimura, Akira× Watanabe, Akira× Wakasugi, Takanobu× Tatami, Ryozo× Ueda, Kosei× Ueda, Ryosei× Kametani, Tomio× Koizumi, Junji× Miyamoto, Susumu× Takeda, Ryoyu× Takeshita, Haruo |
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提供者所属 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 金沢大学大学院医学系研究科 | |||||
書誌情報 |
Journal of Clinical Investigation 巻 67, 号 5, p. 1532-1540, 発行日 1981-01-01 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0021-9738 | |||||
NCID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00695520 | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1172/jci110184 | |||||
出版者 | ||||||
出版者 | American Society for Clinical Investigation | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | We studied biochemical genetics of low density lipoprotein (LDL) receptor mutations in fibroblasts from six homozygous and five heterozygous patients with familial hypercholesterolemia (FH). Three of six homozygotes are receptor-negative type and the other three homozygotes are receptor-defective type. In the cells from three receptor-negative homozygotes, the receptor binding, internalization, and degradation of 125I-LDL were 0.5 ± 0.3 ng/mg protein (mean ± SEM), 14 ± 8 and 8 ± 6 ng/mg protein per 6 h (four normal cells; 44 ± 3, 386 ± 32, and 1,335 ± 214 ng/mg protein per 6 h), respectively. In the cells from three receptor-defective homozygotes, the receptor binding, internalization, and degradation of 12:5I-LDL were 6 ± 2, 29 ± 8, and 90 ± 32 ng/mg protein per 6 h, respectively. In these six homozygotes, two pairs of siblings are included. Two siblings in the same family were classified as receptor-negative and two siblings in another family were classified as receptor-defective. The receptor-negative phenotypes and the receptor-defective phenotypes bred true in individual families. The cells from five heterozygotes showed ~46% of the normal activities of receptor. ML-236B, competitive inhibitor of 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMG-CoA reductase), completely inhibited the incorporation of [14C]acetate into digitonin-precipitable sterols in fibroblasts from normal subjects and heterozygous and homozygous patients with FH with the concentration of 0.5 μg/ml. However, at 0.05 μg/ml of ML-236 B sterol synthesis in fibroblasts from homozygotes was not completely suppressed in contrast to normal and heterozygous cells. Moreover, after preincubation with 0.05 μg/ml of ML-236B for 24 h in medium containing lipoproteins, sterol synthesis in the cells from receptor-negative homozygote showed 75% of the initial activity compared with that of 25% without preincubation. In the cells from a normal subject and heterozygote, sterol synthesis was inhibited even after preincubation. These results suggest that (a) the inhibitory effect of ML-236B is overcome in homozygote cells by their high intracellular levels of HMG-CoA reductase and (b) that a higher dose of ML-236B may be required to lower serum cholesterol levels in FH homozygotes than in heterozygotes. | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 |