Abstract
All cells depend on sterols and isoprenoids derived from mevalonate (MVA) for growth, differentiation, and maintenance of homeostatic functions. In plants, environmental insults like heat and sunlight trigger the synthesis of isoprene, also derived from MVA, and this phenomenon has been associated with enhanced tolerance to heat. Here, we show that in human prostate adenocarcinoma PC-3M cells heat shock leads to activation of the MVA pathway. This is characterized by a dose- and time-dependent elevation in 3-hydroxy-3-methylglutaryl-coenzyme A reductase (HMGR) activity, enhanced sterol and isoprenoid synthesis, and increased protein prenylation. Furthermore, prenylation and subsequent membrane localization of Ras, a central player in cell signaling, was rapidly induced following heat stress. These effects were dose-dependent, augmented with repeated insults, and were prevented by culturing cells in the presence of lovastatin, a competitive inhibitor of HMGR. Enhanced Ras maturation by heat stress was also associated with a heightened activation of extracellular signal-regulated kinase (ERK), a key mediator of both mitogenic and stress signaling pathways, in response to subsequent growth factor stimulation. Thus, activation of the MVA pathway may constitute an important adaptive host response to stress, and have significant implications to carcinogenesis.
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Acknowledgements
We are grateful to Drs Tak-Yee Aw and Xiantao Wang for their valuable assistance, Dr Steven Branch for helpful discussions regarding the HMGR assay, Jennifer Martindale for critical reading of the manuscript, and Dr Dan L Longo for his advice and constant support.
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Shack, S., Gorospe, M., Fawcett, T. et al. Activation of the cholesterol pathway and Ras maturation in response to stress. Oncogene 18, 6021–6028 (1999). https://doi.org/10.1038/sj.onc.1203002
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DOI: https://doi.org/10.1038/sj.onc.1203002
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