Plasmid-aided insertion of MMTV-LTR and ras DNAs to NIH 3T3 fibroblast cells makes them responsive to 2,3,7,8-TCDD causing overexpression of p21ras and down-regulation of EGF receptor.

Molecular toxicology Pub Date : 1989-07-01
J Jankun, F Matsumura, H Kaneko, J E Trosko, A Pellicer, A H Greenberg
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引用次数: 0

Abstract

TCDD administered to NIH 3T3 fibroblast cells transfected with a plasmid containing MMTV-LTR and mouse ras DNAs caused an increased level of p21ras protein and down-regulation of EGF receptor. This effect occurred only in the cells with introduced N-ras or Ha-ras under transcriptional control of glucocorticoid-sensitive MMTV-LTR but not ones without these DNAs. The MMTV-LTR ras-incorporated cells treated with either dexamethasone or TCDD grew in soft agar to form colonies (anchorage independent growth), while nontreated cells did not, indicating profound cellular changes due to activation of N-ras by these two agents.

质粒辅助将MMTV-LTR和ras dna插入NIH 3T3成纤维细胞,使其对2,3,7,8- tcdd产生应答,导致p21ras过表达和EGF受体下调。
用含有MMTV-LTR和小鼠ras dna的质粒转染NIH 3T3成纤维细胞,TCDD可引起p21ras蛋白水平升高和EGF受体下调。这种效应只发生在糖皮质激素敏感的MMTV-LTR转录控制下引入N-ras或Ha-ras的细胞中,而不存在这些dna的细胞中。用地塞米松或TCDD处理的MMTV-LTR ras结合细胞在软琼脂中生长形成集落(锚定独立生长),而未处理的细胞则没有,表明这两种药物激活N-ras导致细胞发生了深刻的变化。
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