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标题：Epidermal growth factor and expression of specific genes: effects on cultured rat pituitary cells are dissociable from the mitogenic response
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作者：L K Johnson ; J D Baxter ; I Vlodavsky 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1980
卷号：77
期号：1
页码：394-398
DOI：10.1073/pnas.77.1.394
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Cultured rat pituitary tumor cells, GH3/D6, which synthesize both growth hormone and prolactin, have cell-surface epidermal growth factor (EGF) receptor sites (34,000 per cell) that bind 125I-labeled EGF with a high affinity (Kd approximately 1 nM). Prolonged treatment of the cells with EGF did not stimulate cell division but did inhibit thyroid hormone-stimulated cell growth. In addition, EGF altered the morphology of the cells from a rounded to an elongated conformation. EGF also induced a perturbation of chromatin structure in GH3 cell nuclei that was detected by an increase (40%) in the number of rifampicin-resistant initiation sites for bacterial RNA polymerase. This was accompanied by an increased synthesis of prolactin and an inhibition of synthesis of growth hormone. In the presence of EGF, the synthesis of growth hormone was no longer inducible by thyroid hormone, but it remained responsive to glucocorticoids. The results demonstrate that EGF can elicit major effects on the cellular phenotype and expression of specific genes in the absence of a proliferative response. This suggests that EGF can also regulate differentiated cellular functions.