Abstract
Human HSP27 is a small heat shock protein that modulates the ability of cells to respond to heat shock and oxidative stress, and also functions as a chaperone independent of ATP, participating in the proteasomal degradation of proteins. The expression of HSP27 is associated with survival in mammalian cells. In cancer cells, it confers resistance to chemotherapy; in neurons, HSP27 has a positive effect on neuronal viability in models of Alzheimerʼs and Parkinsonʼs diseases. To better understand the mechanism by which HSP27 expression contributes to cell survival, we expressed human HSP27 in the budding yeast Saccharomyces cerevisiae under control of different mutant TEF promoters, that conferred nine levels of graded basal expression, and showed that replicative lifespan and proteasomal activity increase as well as the resistance to oxidative and thermal stresses. The profile of these phenotypes display a dose–response effect characteristic of hormesis, an adaptive phenomenon that is observed when cells are exposed to increasing amounts of stress or toxic substances. The hormetic response correlates with changes in expression levels of HSP27 and also with its oligomeric states when correlated to survival assays. Our results indicate that fine tuning of HSP27 concentration could be used as a strategy for cancer therapy, and also for improving neuronal survival in neurodegenerative diseases.
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This work was supported by Grants #2017/09938-2, #2013/07937-8 and #2016/11724-8, São Paulo Research Foundation (FAPESP) and Finance Code 001 from the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES).
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Camandona, V.L., Rios-Anjos, R.M., Alegria, T.G.P. et al. Expression of human HSP27 in yeast extends replicative lifespan and uncovers a hormetic response. Biogerontology 21, 559–575 (2020). https://doi.org/10.1007/s10522-020-09869-9
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DOI: https://doi.org/10.1007/s10522-020-09869-9