Buthionine sulfoximine induced growth inhibition in human lung carcinoma cells does not correlate with glutathione depletion

Buthionine sulfoximine induced growth inhibition in human lung carcinoma cells does not correlate with glutathione depletion
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丁硫氨酸亚砜亚胺诱导的人肺癌细胞生长抑制与谷胱甘肽消耗无关

DOI:
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发表时间:
1991
影响因子:
6.1
通讯作者:
M. Duane Enger
M. Duane Enger
中科院分区:
医学2区
文献类型:
--
作者:
Yu;D. Emery;M. Duane Enger

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l -丁硫氨酸-[S,R]-亚砜亚胺(BSO)治疗A549人肺癌细胞可导致细胞谷胱甘肽(GSH)耗竭和生长抑制。本研究确定了BSO对细胞生长影响的性质以及BSO对细胞生长的抑制作用与BSO对细胞GSH水平的影响之间的关系。观察到BSO对细胞生长的剂量依赖性效应,但发现这种效应与BSO对细胞GSH水平的影响无关。用浓度为5和10 mM的BSO处理60小时,发现以相似的速率消耗细胞谷胱甘肽,并且达到不可检测的水平(低于0.5 nmol/mg蛋白质)。然而,在10毫米的BSO中,生长停止,而在5毫米的BSO中,生长继续,超过对照的一半。结果表明,细胞生长和细胞保护自身免受BSO的抗增殖作用所需的细胞内G - GSH可能有一个明显的阈值水平(大约或小于0.5 nmol/mg蛋白)。在浓度为10 mM时,BSO抑制DNA和蛋白质合成,并在细胞周期的整个阶段而不是特定阶段阻止A549细胞的生长。菌落形成效率(CFE)和电镜研究表明,BSO对生长没有抑制作用,并伴有细胞毒性作用的迹象。0.1 mM BSO对A549细胞的生长也有刺激作用。
Treatment of A549 human lung carcinoma cells with L-buthionine-[S,R]-sulfoximine (BSO) results concomitantly in cellular glutathione (GSH) depletion and growth inhibition. The nature of BSO effects on cell growth and the relationships between BSO inhibition of cell growth and BSO effects on cellular GSH levels were determined in this study. A dose dependent effect of BSO on cell growth was observed, but this effect was found not to correlate with BSO effects on cellular GSH levels. Treatment with BSO for 60 h at concentrations of 5 and 10 mM was found to deplete cellular GSH at similar rates and to an undetectable level (below 0.5 nmol/mg protein). However, cessation of growth occured in 10 mM BSO whereas growth continued at better than one half the control rate in 5 mM BSO. The results suggest there may be a distinct threshold level of intracellular G GSH (on the order of or less than 0.5 nmol/mg protein) required for cell growth and for cells to protect themselves from the antiproliferative effects of BSO. At a concentration of 10 mM, BSO inhibited both DNA and protein synthesis and arrested growth of A549 cells throughout rather than at a specific phase of the cell cycle. BSO inhibition of growth was not, as indicated by colony-forming efficiency (CFE) and electron microscopy studies, accompanied by indications of cytotoxic effects. A stimulatory effect of 0.1 mM BSO on the growth of A549 cells was found also.
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