Abstract
The frog Nanorana parkeri (Dicroglossidae) is endemic to the Tibetan Plateau, and overwinters shallow pond within damp caves for up to 6 months. Herein, we investigate the freeze tolerance of this species and profile changes in liver and skeletal muscle metabolite levels using an untargeted LC–MS-based metabolomic approach to investigate molecular mechanisms that may contribute to freezing survival. We found that three of seven specimens of N. parkeri could survive after being frozen for 12 h at − 2.0 °C with 39.91% ± 5.4% (n = 7) of total body water converted to ice. Freezing exposure induced partial dehydration of the muscle, which contributed to decreasing the amount of freezable water within the muscle and could be protective for the myocytes themselves. A comparative metabolomic analysis showed that freezing elicited significant responses, and a total of 33 and 36 differentially expressed metabolites were identified in the liver and muscle, respectively. These metabolites mainly participate in alanine, aspartic acid and glutamic acid metabolism, arginine and proline metabolism, and D-glutamine and D-glutamate metabolism. After freezing exposure, the contents of ornithine, melezitose, and maltotriose rose significantly; these may act as cryoprotectants. Additionally, the content of 8-hydroxy-2-deoxyguanine, 7-Ketocholesterol and hypoxanthine showed a marked increase, suggesting that freezing induced oxidative stress in the frogs. In summary, N. parkeri can tolerate a brief and partial freezing of their body, which was accompanied by substantial changes in metabolomic profiles after freezing exposure.
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Acknowledgements
Funding for this research was provided by the National Natural Science Foundation of China (no. 31971416 and no. 32001110), the Open Project of State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University (2020-KF-002) and the Project of Scientific Research Foundation of Dezhou University (2019xjrc315). We thank Biotree Biotechnology Co., Ltd. for assistance in the metabolomics analysis of samples.
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Niu, Y., Cao, W., Wang, J. et al. Freeze tolerance and the underlying metabolite responses in the Xizang plateau frog, Nanorana parkeri. J Comp Physiol B 191, 173–184 (2021). https://doi.org/10.1007/s00360-020-01314-0
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DOI: https://doi.org/10.1007/s00360-020-01314-0