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Cold and warm waters: energy metabolism and antioxidant defenses of the freshwater fish Astyanax lacustris (Characiformes: Characidae) under thermal stress

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Abstract

Subtropical fish are exposed to seasonal variations in temperature that impose a set of adaptations on their metabolism necessary for the maintenance of homeostasis. In this study, we addressed the effects of temperature variation on the metabolism of Astyanax lacustris, a species of freshwater fish common in the subtropical region of Brazil. Biomarkers of carbohydrate and protein metabolism, antioxidant defense, and oxidative damage were evaluated in the liver of A. lacustris exposed to low (15 °C) and high (31 °C) temperature thermal shock, with controls at 23 °C for 2, 6, 12, 24, 48, 72, and 96 h. A high energy demand was observed during the first 48 h of exposure to 15 °C, which is necessary for metabolic adjustment at low temperatures, with an increase in glycolysis, citric acid cycle, and amino acid catabolism. In addition, at 31 °C, glucose was exported in the first 12 h of exposure, and an increase in the citric acid cycle suggested acetyl-CoA as the pathway substrate, originating from the oxidation of lipids. The antioxidant defenses did not change at 15 °C, as opposed to 31 °C, in which there were changes in several antioxidant defense markers, indicating a response to the production of ROS. However, oxidative stress was observed at both temperatures, with oxidative damage detected by lipid peroxidation at 15 °C and protein carbonylation at 31 °C.

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Acknowledgements

We thank the Ildo Zago Aquaculture Research and Extension Center (Paraná State University) for their help and support during the execution of the experiments in the present work. This study was financed in part by the Brazilian Federal Agency for Support and Evaluation of Graduate Education (CAPES) (Finance Code 001) and by the National Council for the Development of Scientific and Technological Research (CNPq) (process 407658/2018-1 and 307452/2019-0).

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Correspondence to Lucélia Donatti.

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Communicated by B. Pelster.

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Schleger, I.C., Pereira, D.M.C., Resende, A.C. et al. Cold and warm waters: energy metabolism and antioxidant defenses of the freshwater fish Astyanax lacustris (Characiformes: Characidae) under thermal stress. J Comp Physiol B 192, 77–94 (2022). https://doi.org/10.1007/s00360-021-01409-2

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  • DOI: https://doi.org/10.1007/s00360-021-01409-2

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