PMID: 1068471Oct 1, 1976

Hormonal stimulation of DNA synthesis in primary cultures of adult rat hepatocytes

Proceedings of the National Academy of Sciences of the United States of America
R A RichmanD L Friedman

Abstract

Adult rat hepatocytes have been previously isolated and maintained in monolayer culture, but attempts to stimulate DNA synthesis have been unsuccessful. Hormonal conditions are now described which induce DNA synthesis in cultured hepatocytes from partially hepatectomized rats. DNA synthesis was determined autoradiographically by the incorporation of [3H]thymidine into nuclei of morphologically distinct hepatocytes. Insulin (4-4000 nM) or epidermal growth factor (10 ng/ml) alone caused significant increases in the labeling index. The two hormones together acted synergistically to produce labeling indices of 35-50% on the third day of culture, compared with 2-7% in control cultures. The addition of glucagon (400 nM) further increased the labeling indes. Dexamethasone (80 ng/ml) inhibited DNA synthesis but, under certain conditions, enhanced cell attachment. Growth hormone and triiodothyronine had no significant effect on DNA synthesis. The mixture of epidermal growth factor, insulin, and glucagon also stimulated incorporation of [3H]thymidine into phenol-extracted DNA. Although DNA synthesis was stimulated, cell division occurred infrequently. These data suggest a prominent role for epidermal growth factor in promoting hepatic DN...Continue Reading

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Related Concepts

Cell Adhesion
Cell Division Phases
Oradexon
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Dose-Response Relationship, Drug
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Insulin B Chain
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