Abstract
In vitro cellular models provide valuable insights into the adaptive biochemical mechanisms triggered by cells to cope with the stress situation induced by hypoxia and reoxygenation cycles. The first biological data generated in studies based on this micrometric life-scale has the potential to provide us a global overview about the main biochemical phenomena presented in some reported preconditioning therapies in life-scale of higher dimensions. Thus, in this study, a cell incubator was designed and manufactured to produce a cellular model of heart hypoxia followed by reoxygenation (HfR) through consecutive repetitions of hypoxia-normoxia gas exchange. Samples of cellular extracts and culture media were obtained from non-proliferative cardiomyocytes (CMs) cultivated under challenging HfR (stressed CMs) and regular cultivation (unstressed CMs) in rounds of four days for each case. Metabolomic based on proton magnetic resonance spectroscopy (1H-MRS) was used as an analytical approach to identify and quantify the metabolomes of these samples, the endo- and exo-metabolome. Despite the stressed CMs presented over 90% higher cellular death rate compared to the unstressed CMs, the metabolic profiles indicates that the surviving cells up-regulate their amino acid metabolism either by active protein degradation or by the consumption of culture media components to increase coenzyme A-dependent metabolic pathways. This cell auto-regulation mechanism could be well characterized in the first two days when the difference smears off under once the metabolomes become similar. The metabolic adaptations of stressed CMs identified the relevance of the cyclic oxidation/reduction reactions of nicotinamide adenine dinucleotide phosphate molecules, NADP+/NADPH, and the increased tricarboxylic acid cycle activity in an environment overloaded with such a powerful antioxidant agent to survive an extreme HfR challenge. Thus, the combination of cellular models based on CMs, investigative methods, such as metabolomic and 1H-MRS, and the instrumental development of hypoxia incubator shown in this work were able to provide the first biochemical evidences behind therapies of gaseous exchanges paving the way to future assays.
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Data Availability
Experimental data, statistical analysis results, protocols used for cell manipulation, and hypoxia incubator electric schemes that supported this study can be found within the paper, in the supplementary materials or can be provided from the corresponding author on reasonable request.
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Acknowledgements
The authors would like to acknowledge the Sao Paulo Research Foundation - FAPESP (grants 2011/19678-1; 2013/17368-0; 2014/22102-2; 2014/21646-9; 2018/20910-5), and Medical Sciences Graduate Program-CAPES/PROEX for financial support; Instituto de Pesquisas Tecnologicas (IPT) for providing NMR spectrometer and facilities; Laboratory of Genetics and Molecular Cardiology, Heart Institute (InCor), University of Sao Paulo School of Medicine for providing cells and scientific assistance; and National Institute of Science and Technology Complex Fluids (INCT-FCX) for daily financial aid.
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L.D.M.C. and A.C.B. contributed to design, coding, calibrations, and the first trials with cells in the HI device. A.C.B. contributed performing all the resonance experiments, biological interpretations, and drafted the entire manuscript. L.D.M.C. contributed to the cell experiments, sample preparation, viability assays, resonance data processing, and statistical analysis. Y.B.B. and C.V.V. made suggestions and corrections to the manuscript. L.F.G. contributed to the revision of biological interpretations of the results and its respective discussions. C.V.V. drew Fig. 6. All authors contributed to the revision of the manuscript and agreed to be fully accountable for ensuring the integrity and accuracy of the work and reading and approving the final manuscript.
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Condori, L.D.M., Vivas, C.V., Barreto, Y.B. et al. Effects of Hypoxia and Reoxygenation on Metabolic Profiles of Cardiomyocytes. Cell Biochem Biophys (2024). https://doi.org/10.1007/s12013-024-01249-1
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DOI: https://doi.org/10.1007/s12013-024-01249-1