Cloning of a μ-class glutathione S-transferase complementary DNA and characterization of its glucocorticoid inducibility in a smooth muscle tumor cell line

Cloning of a μ-class glutathione S-transferase complementary DNA and characterization of its glucocorticoid inducibility in a smooth muscle tumor cell line
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μ 级谷胱甘肽 S-转移酶互补 DNA 的克隆及其在平滑肌肿瘤细胞系中糖皮质激素诱导能力的表征

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发表时间:
1991
期刊:
影响因子:
--
通讯作者:
Roy G. Smith
Roy G. Smith
中科院分区:
--
文献类型:
--
作者:
J. Norris;D. Schwartz;S. Macleod;W. Fan;T. O'brien;S. Harris;R. Trifiletti;L. Cornett;T. Cooper;W. M. Levi;Roy G. Smith

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从用丙酮曲安西龙处理的平滑肌肿瘤细胞(DDT 1 MF-2)的mRNA构建的λZAP文库中克隆了包含仓鼠μ-类谷胱甘肽S-转移酶(GST)亚基的完整编码序列的cDNA(命名为hGSTYBX)。核苷酸序列和推导的氨基酸序列分析表明,该基因与大鼠μ类GSTYB 2亚基同源性最高。在增殖的亚融合细胞中,hGSTYBX mRNA的组成型表达检测不到,糖皮质激素处理诱导hGSTYBX表达后的时间滞后3小时,最大诱导发生在10小时。核连续分析表明,糖皮质激素诱导至少部分是由于转录速率的增加。糖皮质激素和放线菌酮同时处理阻止糖皮质激素诱导,但对融合细胞的基础表达影响不大。相反,放线菌酮治疗3小时后,糖皮质激素治疗导致几乎完全诱导。这些结果…
A cDNA (designated hGSTYBX) encompassing the complete coding sequence of a hamster μ-class glutathione S-transferase (GST) subunit was cloned from a λZAP library constructed with mRNA isolated from triamcinolone acetonide-treated smooth muscle tumor cells (DDT1 MF-2). Analysis of its nucleotide and deduced amino acid sequences demonstrated highest homology to the rat μ-class GST YB2 subunit. In proliferating subconfluent cells, in which constitutive expression of hGSTYBX mRNA was undetectable, glucocorticoid treatment induced hGSTYBX expression after a time lag of 3 h, and maximal induction occurred at 10 h. Nuclear run-onanalysis showed that glucocorticoid induction resulted at least in part from an increased rate of transcription. Simultaneous treatment with glucocorticoid and cycloheximide prevented glucocorticoid induction, but had little effect on basal expression in confluent cells. In contrast, cycloheximide treatment 3 h after glucocorticoid treatment resulted in nearly full induction. These resul...
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