Abstract
THE understanding of the control of cell proliferation and differentiation requires the unravelling of the early events that trigger the initiation of growth. An in vitro system to study the initiation of growth is provided by the mouse 3T3 cell line. These cells exist in two alternative growth states: either reversibly arrested in the G0 phase of the cell cycle or in active proliferation. When resting 3T3 cells are exposed to fresh serum they recommence DNA synthesis and cell division1. Functional membrane changes are among the earliest events associated with the reinitiation of growth2. Within minutes of serum addition, the rate of transport of inorganic phosphate, nucleosides and glucose is increased several fold2–6, while cyclic AMP, which has been implicated in the regulation of growth of cultured fibroblasts, shows an opposite change7–11.
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DE ASUA, L., ROZENGURT, E. Multiple control mechanisms underlie initiation of growth in animal cells. Nature 251, 624–626 (1974). https://doi.org/10.1038/251624a0
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DOI: https://doi.org/10.1038/251624a0
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