The cellular stress response induced by aqueous extracts of cigarette smoke is critically dependent on the intracellular glutathione concentration

Carcinogenesis
Thomas Müller, Stephan Gebel

Abstract

Mainstream cigarette smoke (CS) trapped in phosphate-buffered saline solutions (smoke-bubbled PBS) has been shown to induce a strong stress response in cultured cells. This is reflected, for example, by the expression of stress genes such as c-fos and haem oxygenase, a transient decrease in the translation efficiency and the induction of cell cycle arrest. In these studies, peroxynitrite, the reaction product of nitric oxide (NO) and superoxide (O2-.), was identified as an active principle formed by CS in aqueous solutions. In the present study, we show that the CS-induced stress response is critically dependent on the intracellular glutathione (GSH) content which itself becomes diminished in cells exposed to smoke-bubbled PBS. Investigations using c-fos expression as a measure for cellular stress revealed a direct correlation between the smoke-bubbled PBS concentration necessary for stress-dependent c-fos expression and the intracellular GSH concentration observed in different cell lines. Correspondingly, 3T3 fibroblasts artificially depleted of GSH by pretreatment with buthionine-sulphoximine (BSO), an inhibitor of GSH synthesis, require significantly lower amounts of smoke-bubbled PBS to obtain a detectable c-fos expression,...Continue Reading

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