3′-Azidothymidine (Zidovudine) Inhibits Glycosylation and Dramatically Alters Glycosphingolipid Synthesis in Whole Cells at Clinically Relevant Concentrations (*)

3′-Azidothymidine (Zidovudine) Inhibits Glycosylation and Dramatically Alters Glycosphingolipid Synthesis in Whole Cells at Clinically Relevant Concentrations (*)
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3-叠氮胸苷 (Zidovudine) 在临床相关浓度下抑制糖基化并显着改变全细胞中的鞘糖脂合成 (*)

DOI:
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发表时间:
1995
影响因子:
4.8
通讯作者:
Paul Melan¸on
Paul Melan¸on
中科院分区:
生物学2区
文献类型:
--
作者:
Jian;D. Ilsley;Corinne Frohlick;R. Steet;E. T. Hall;R. Kuchta;Paul Melan¸on

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最近对高尔基体富集膜的体外研究表明,3′-叠氮胸苷-5 ′-单磷酸(AZTMP)(3′-叠氮胸苷(AZT)的主要细胞内代谢物)是糖基化反应的有效抑制剂(Hall et al.(1994)J.Biol.Chem.269,14355-14358),并预测全细胞的AZT处理应引起类似的抑制。在这份报告中,我们证实了这一预测,显示治疗K562细胞与AZT抑制脂质和蛋白质糖基化。AZT治疗显著改变了鞘糖脂的生物合成模式,在临床相关浓度(1-5 μM)下几乎消除了神经节苷脂的合成,并抑制了唾液酸和半乳糖掺入蛋白质。对照实验表明,这些变化不产生非特异性的影响,无论是分泌装置或蛋白质合成。另一方面,使用分离的细胞核作为染色体DNA复制的模型系统的研究表明,AZTTP是一种非常弱的DNA合成抑制剂。这些观察结果强烈表明,AZT在体内的骨髓抑制作用是由于抑制蛋白质和/或脂质糖基化,而不是对染色体DNA复制的影响。
Recent in vitro work with Golgi-enriched membranes showed that 3′-azidothymidine-5′-monophosphate (AZTMP), the primary intracellular metabolite of 3′-azidothymidine (AZT), is a potent inhibitor of glycosylation reactions (Hall et al.(1994) J. Biol. Chem. 269, 14355-14358) and predicted that AZT treatment of whole cells should cause similar inhibition. In this report, we verify this prediction by showing that treatment of K562 cells with AZT inhibits lipid and protein glycosylation. AZT treatment dramatically alters the pattern of glycosphingolipid biosynthesis, nearly abolishing ganglioside synthesis at clinically relevant concentrations (1-5 μM), and suppresses the incorporation of both sialic acid and galactose into proteins. Control experiments demonstrate that these changes do not result from nonspecific effects on either the secretory apparatus or protein synthesis. On the other hand, studies using isolated nuclei as a model system for chromosomal DNA replication show that AZTTP is a very weak inhibitor of DNA synthesis. These observations strongly suggest that the myelosuppressive effects of AZT in vivo are due to inhibition of protein and/or lipid glycosylation and not to effects on chromosomal DNA replication.
人红白血病细胞系 HEL 和 K562 的碳水化合物抗原谱。
DOI: --
发表时间: 1983
期刊: Blood
影响因子: 20.3
作者:
Kannagi,R;Papayannopoulou,T;Nakamoto,B;Cochran,NA;Yokochi,T;Stamatoyannopoulos,G;Hakomori,S
通讯作者: Hakomori,S
DOI: 10.1016/s0021-9258(18)68785-x
发表时间: 1988-05
期刊: The Journal of biological chemistry
影响因子: --
作者:
N. Hanai;T. Dohi;G. Nores;S. Hakomori
通讯作者: N. Hanai;T. Dohi;G. Nores;S. Hakomori
DOI: 10.1073/pnas.79.15.4540
发表时间: 1982-01-01
期刊: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA-BIOLOGICAL SCIENCES
影响因子: --
作者:
ELDER, JH;ALEXANDER, S
通讯作者: ALEXANDER, S
DOI: 10.1016/s0021-9258(17)39801-0
发表时间: 1984-06
期刊: The Journal of biological chemistry
影响因子: --
作者:
E. Bremer;S. Hakomori;D. Bowen-Pope;E. Raines;R. Ross
通讯作者: E. Bremer;S. Hakomori;D. Bowen-Pope;E. Raines;R. Ross