Abstract
We report here that human leukocyte interferon preparations are capable of influencing the transition of human melanoma cells from the "A" state to the "B" phase. Human melanoma cells that enter a quiescent stage at high cell density are more sensitive to the cytostatic action of interferon than those that continue to proliferate under similar conditions. Cell cycle perturbations caused by interferon in these cells include a decreased transition rate out of G0-G1 ("A" state) into S ("B" phase) and a prolongation of S. These findings support the idea that some metabolic event is required for progress through the G0-G1 phase of the cell cycle and is susceptible to interferon action.
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