Elevation of intracellular glutathione content associated with mitogenic stimulation of quiescent fibroblasts

Journal of Cellular Physiology
J P Shaw, I N Chou

Abstract

The relationship between total glutathione (GSH) content and cell growth was examined in 3T3 fibroblasts. The intracellular GSH level of actively growing cultures gradually decreases as these cells become quiescent by either serum deprivation or high cell density. Upon mitogenic stimulation of sparse, quiescent (G0/G1) cultures with serum, there is a rapid 2.3-fold elevation in intracellular GSH levels which is maximal by 1 h and returns to baseline by 2 h. This is followed by a more gradual increase in GSH content as cells enter the S phase. In addition, the elevation in GSH content is required for maximum induction of DNA synthesis. Treatments that prevent the early increase in intracellular GSH levels do not affect protein synthesis but result in a reversible dose-dependent decrease in the percent of cells capable of entering S phase. These results indicate that GSH may be important in the regulation of cellular proliferation.

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