Rillema JA, Linebaugh BE. Characteristics of the insulin stimulation of DNA, RNA and protein metabolism in cultured human mammary carcinoma cells.
BIOCHIMICA ET BIOPHYSICA ACTA 1977;
475:74-80. [PMID:
849449 DOI:
10.1016/0005-2787(77)90340-9]
[Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
In a mammary gland cell line (MCF-7) of human origin, insulin stimulated the rates of RNA, DNA and protein biosynthesis. These effects were observed with concentrations of insulin ranging from 10(-6) M to 10(-10) M. Enhanced rates of [3H]leucine incorporation into protein and [3H]uridine incorporation into RNA were observed within 1 h after exposing the cells to insulin. In contrast, a stimulatory effect of insulin on the rate of [3H]thymidine incorporation into DNA was only detectable following a 12--16 h incubation with insulin. Insulin also enhanced the rate of uptake of [3H]leucine, [3H]uridine, and [3H]thymidine into the MCF-7 cells. Finally, incubation with insulin increased the total amount of DNA, RNA and protein in these cells.
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