Abstract
Spaceflight entails a variety of environmental and psychological stressors that may have long-term physiological and genomic consequences. Metabolomics, an approach that investigates the terminal metabolic outputs of complex physiological alterations, considers the dynamic state of the human body and allows the identification and quantification of down-stream metabolites linked to up-stream physiological and genomic regulation by stress. Employing a metabolomics-based approach, this study investigated longitudinal metabolic perturbations of male (n = 40) and female (n = 11) astronauts on 4–6-month missions to the International Space Station (ISS). Proton nuclear magnetic resonance (1H-NMR) spectroscopy followed by univariate, multivariate and machine learning analyses were used on blood serum to examine sex-specific metabolic changes at various time points throughout the astronauts’ missions, and the metabolic effects of long-duration space travel. Space travel resulted in sex-specific changes in energy metabolism, bone mineral and muscle regulation, immunity, as well as macromolecule maintenance and synthesis. Additionally, metabolic signatures suggest differential metabolic responses—especially during the recovery period—with females requiring more time to adjust to return to Earth. These findings provide insight into the perturbations in glucose and amino acid metabolism and macromolecule biosynthesis that result from the stressors of long-duration spaceflight. Metabolomic biomarkers may provide a viable approach to predicting and diagnosing health risks associated with prolonged space travel and other physiological challenges on Earth.
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References
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Acknowledgements
We thank the NASA JSC Nutritional Biochemistry Lab for their efforts in coordination of study protocols and sample collection, processing, and management. We are grateful to the NASA Human Research Program’s Human Health Countermeasures Element for their support and funding of the underlying projects reported herein. We acknowledge Braeden Heninger, Mat Williamson, Cole Pawlenchuk, Ben Wright, Clay Powelson, and Shae Hilderman for their assistance in sample preparation. We also thank the University of Lethbridge Magnetic Resonance Facility (Lethbridge, AB, Canada) for providing access to and training on the Bruker 700 MHz NMR instrument, and Michael Opyr for assistance with NMR data collection and processing methods used to complete this study. We are grateful to Jyote Boora for his contribution in initiating this collaboration.
Funding
This work was funded by the Natural Sciences and Engineering Research Council of Canada (NSERC), Discovery Grant # 05519 to G.M., an Alberta Innovates (AI) Summer Research Studentship to J.S., and a Health Research Accelerator Fund grant from the University of Lethbridge Research Services Office to G.M. and T.M. The primary studies were funded by the Human Health Countermeasures Element of the NASA Human Research Program. Dr. Heer’s support was provided in part by grant WB 0931 from the German Aerospace Center (DLR), Germany.
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SZ, SS, MH, TM, and GM designed the study. SZ and SS assisted with sample collection and coordinated data analysis. JS, MG, and TM prepared the samples for 1H NMR and analysed the data. JS, MG, SS, TM, and GM contributed to writing the manuscript. All authors have read and approved the final version of the manuscript.
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Participants provided written informed consent prior to sample collection, as well as for the extended analyses reported herein. Approval for this study was granted by Human Participant Research Committee at the University of Lethbridge (# 2021-107), the National Aeronautics and Space Administration (NASA) Johnson Space Center Institutional Review Board (# 0225, 0326, 0797), the Japanese Aerospace Exploration Agency, and the European Space Agency Medical Boards.
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Stroud, J.E., Gale, M.S., Zwart, S.R. et al. Longitudinal metabolomic profiles reveal sex-specific adjustments to long-duration spaceflight and return to Earth. Cell. Mol. Life Sci. 79, 578 (2022). https://doi.org/10.1007/s00018-022-04566-x
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DOI: https://doi.org/10.1007/s00018-022-04566-x