De novo synthesis of glutathione is required for both entry into and progression through the cell cycle

Journal of Cellular Physiology
M PootT J Kavanagh

Abstract

To study the putative role of de novo synthesis of glutathione (GSH) in the regulation of the cell cycle, we exposed NIH-3T3 cells to buthionine sulfoximine (BSO) and analysed cell cycle kinetics with continuous bromodeoxyuridine (BrdU) labeling and bivariate Hoechst 33258/ethidium bromide flow cytometry. Treating quiescent cells, which themselves had a low GSH content, with BSO did not affect subsequent entry into and progression through the cell cycle. Adding BSO during serum stimulation, however, provoked a dose-dependent inhibition of cell growth and a delayed increase in GSH level. The cell kinetic mechanism underlying BSO-induced growth inhibition is a diminished entry into the cell cycle and a permanent arrest in the S and G2 phase of the cell cycle. Our results are consistent with the hypothesis that GSH de novo synthesis is required for cell activation and proper S and G2 phase transit.

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