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Cell cycle‐specific glucocorticoid growth regulation of a human cell line (NHIK 3025)
Author(s) -
Bakke Oddmund,
EikNes Kristen B.
Publication year - 1981
Publication title -
journal of cellular physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.529
H-Index - 174
eISSN - 1097-4652
pISSN - 0021-9541
DOI - 10.1002/jcp.1041090315
Subject(s) - cell cycle , glucocorticoid , dexamethasone , mitosis , cell division , glucocorticoid receptor , cell culture , cell growth , restriction point , microbiology and biotechnology , chemistry , cell , dna synthesis , steroid hormone , biology , endocrinology , in vitro , hormone , biochemistry , cell cycle progression , genetics
It has been reported that the human cell line NHIK 3025 has a specific cytoplasmic glucocorticoid receptor. When these cells were exposed to glucocorticoids, the cell cycle time was prolonged. Cells, synchronized by mitotic selection, were subjected to the synthetic glucocorticoid dexamethasone throughout the cell cycle. Only cells exposed in the first half of G1 phase had a lengthened cell cycle time. Most of the prolongation was also located within the G1 phase. The dexamethasone growth inhibition was reversible and could be detected only in the cell cycle where the cells were exposed to the steroid. DNA‐histograms of asynchronous cells were recorded by flowcytometry at various times after steroid exposure. These histograms also showed G1 phase sensitivity and G1 phase prolongation after exposure to dexamethasone. Our results thus indicate that these cells have a dexamethasone‐sensitive restriction point in mid‐G1 phase of the cell cycle.