Abstract
African clawed frogs (Xenopus laevis) endure bouts of severe drought in their natural habitats and survive the loss of approximately 30% of total body water due to dehydration. To investigate molecular mechanisms employed by X. laevis during periods of dehydration, the heat shock protein response, a vital component of the cytoprotective stress response, was characterized. Using western immunoblotting and multiplex technology, the protein levels of HSP27, HSP40, HSP60, HSP70, HSC70, and HSP90 were quantified in the liver, skeletal muscle, kidney, lung, and testes from control frogs and those that underwent medium or high dehydration (~16 or ~30% loss of total body water). Dehydration increased HSP27 (1.45–1.65-fold) in the kidneys and lungs, and HSP40 (1.39–2.50-fold) in the liver, testes, and skeletal muscle. HSP60 decreased in response to dehydration (0.43–0.64 of control) in the kidneys and lungs. HSP70 increased in the liver, lungs, and testes (1.39–1.70-fold) during dehydration, but had a dynamic response in the kidneys (levels increased 1.57-fold with medium dehydration, but decreased to 0.56 of control during high dehydration). HSC70 increased in the liver and kidneys (1.20–1.36-fold), but decreased in skeletal muscle (0.27–0.55 of control) during dehydration. Lastly, HSP90 was reduced in the kidney, lung, and skeletal muscle (0.39–0.69 of control) in response to dehydration, but rose in the testes (1.30-fold). Overall, the results suggest a dynamic tissue-specific heat shock protein response to whole body dehydration in X. laevis.
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Acknowledgements
We thank Jan Storey for the editorial review of this article. This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery grant (#6793) to KBS. BEL holds a NSERC Canada Graduate Research Scholarship, SW holds a postgraduate Queen Elizabeth II Graduate Scholarship in Science and Technology, and KBS holds the Canada Research Chair in Molecular Physiology.
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BEL and SW are co-first authors. BEL conceived, designed, performed the experiments, analyzed the data, and wrote the paper. SW conceived, designed, performed the experiments, analyzed the data, and wrote the paper. AIM conceived and performed some of the experiments. KBS contributed reagents, materials, and wrote the paper.
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Luu, B.E., Wijenayake, S., Malik, A.I. et al. The regulation of heat shock proteins in response to dehydration in Xenopus laevis . Cell Stress and Chaperones 23, 45–53 (2018). https://doi.org/10.1007/s12192-017-0822-9
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DOI: https://doi.org/10.1007/s12192-017-0822-9