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• W1983670214 abstract "The conditions for stimulation of ornithine decarboxylase (ODC) and DNA synthesis in primary monolayer cultures of non-growing, highly differentiated hepatocytes from adult rats were compared. The syntheses of ODC and DNA were not stimulated by hormones on the 1st day of culture, but they were induced markedly by insulin (10−8 M) and epidermal growth factor (EGF, 0.1 μg/ml) in cells cultured for 40 h. The effects of insulin and EGF were synergistic, and the ODC activity as well as the DNA synthesis in the presence of these hormones was comparable to that of cultured hepatocytes from partially hepatectomized liver. Other factors had different effects on the two processes. Dexamethasone induced ODC slightly, but it inhibited DNA synthesis strongly. Putrescine inhibited ODC activity, but it had no effect on DNA synthesis. Asparagine and glutamine induced ODC activity, but they inhibited DNA synthesis; their inhibitory effects on DNA synthesis were specific to primary cultured liver cells and were not seen in an established rat liver cell line or in mouse L cells. These results show that although there is some correlation between ODC induction and DNA synthesis, the former is not essential for cell growth. There was no indication of cell division under conditions where maximal ODC induction and DNA synthesis were observed. Cytofluorometry of cells treated with insulin and EGF showed that the DNA content increased from 2 N to 4 N, and to 8 N in some cells. Therefore, under the present culture conditions, mature liver cells could enter G2 phase through S phase, but could not enter M phase." @default.
• W1983670214 created "2016-06-24" @default.
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• W1983670214 date "1981-10-01" @default.
• W1983670214 modified "2023-09-25" @default.
• W1983670214 title "Control of DNA synthesis and ornithine decarboxylase activity by hormones and amino acids in primary cultures of adult rat hepatocytes" @default.
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• W1983670214 doi "https://doi.org/10.1016/0014-4827(81)90172-5" @default.
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