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An 18,000 Molecular Weight Polypeptide Induces Early Events and Stimulates DNA Synthesis in Cultured Cells

Henry R. Bourne and Enrique Rozengurt
Proceedings of the National Academy of Sciences of the United States of America
Vol. 73, No. 12 (Dec., 1976), pp. 4555-4559
Stable URL: http://www.jstor.org/stable/66154
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
An 18,000 Molecular Weight Polypeptide Induces Early Events and Stimulates DNA Synthesis in Cultured Cells
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Abstract

Extracts of serum-free medium, conditioned by contact with SV40-transformed BHK cells, stimulate DNA synthesis in cultured fibroblasts. From this source, we have purified a homogeneous basic protein of 18,000 molecular weight, termed fibroblast derived growth factor. In submicrogram quantities, fibroblast derived growth factor stimulates DNA synthesis in mouse 3T3 cells, in the absence of added serum. Prior to the onset of DNA synthesis, both serum and fibroblast derived growth factor induce an array of nearly simultaneous biochemical changes in the membrane of 3T3 cells that include stimulation of the uptake of nucleosides, 2-deoxyglucose, and 86Rb+. These results strongly suggest that the early events are integral components of the proliferative response, rather than coincidental effects of nonmitogenic molecules present in serum.

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