Abstract
Cellular responses induced by stress are essential for the survival of cells under adverse conditions. These responses, resulting in cell adaptation to the stress, are accomplished by a variety of processes at the molecular level. After an alteration in homeostatic conditions, intracellular signalling processes link the sensing mechanism to adaptive or compensatory changes in gene expression. The ability of cells to adapt to hyperosmotic stress involves early responses in which ions move across cell membranes and late responses characterized by increased synthesis of either membrane transporters essential for uptake of organic osmolytes or of enzymes involved in their synthesis. The goal of these responses is to return the cell to its normal size and maintain cellular homeostasis. The enhanced synthesis of molecular chaperones, such as heat shock proteins, is another important component of the adaptive process that contributes to cell survival. Some responses are common to different stresses, whereas others are specific. In the first part of the review, we illustrate the characteristic and specific features of adaptive response to hypertonicity; we then describe similarities to and differences from other cellular stresses, such as genotoxic agents, nutrient starvation and heat shock.
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Acknowledgments
The authors thank Dr. K.P. Wheeler and Dr. A.F. Borghetti for carefully reading and for the constructive criticism of this manuscript.
We apologize to the colleagues whose works have not been cited in the present review because of space limitations and our inability to find their work in the literature search.
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Alfieri, R.R., Petronini, P.G. Hyperosmotic stress response: comparison with other cellular stresses. Pflugers Arch - Eur J Physiol 454, 173–185 (2007). https://doi.org/10.1007/s00424-006-0195-x
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DOI: https://doi.org/10.1007/s00424-006-0195-x