ESA VIVALDI Dry Immersion Microgravity Simulations Induce Increases in Immune Biomarkers Associated With Physical and Psychological Stress, and Sex-Specific Factors
{"title":"ESA VIVALDI Dry Immersion Microgravity Simulations Induce Increases in Immune Biomarkers Associated With Physical and Psychological Stress, and Sex-Specific Factors","authors":"Pauline Jacob, Adrien Robin, Nastassia Navasiolava, Marc-Antoine Custaud, Stéphanie Ghislin, Marie-Pierre Bareille, Rebecca Billette De Villemeur, Inês Antunes, Angelique Van Ombergen, Guillemette Gauquelin-Koch, Jean-Pol Frippiat","doi":"10.1096/fj.202502198R","DOIUrl":null,"url":null,"abstract":"<p>With future manned space projects involving missions of unprecedented duration, multisystem deconditioning induced by spaceflight could seriously affect the well-being and health of astronauts. Safe and easily determined in-flight biomarkers are therefore needed to monitor health status. In this study, we simulated space deconditioning with a 5-day dry immersion (DI) of 18 healthy women and 19 healthy men and evaluated the effects of this protocol on three biomarkers: the neutrophil-to-lymphocyte ratio (NLR), the granulocyte-to-lymphocyte ratio (GLR) and the platelet-to-lymphocyte ratio (PLR). Increases in all three ratios were observed in both men and women, as also observed at the end of a space mission or after exposure to simulated microgravity. These increases were associated with physical and psychological stress in both sexes. Furthermore, our work suggested a positive link between NLR increase and cardiovascular system alteration in women, whereas in men, there would be a positive relationship between NLR, GLR, PLR, and inflammation. Thus, in addition to physical and psychological stress, sex-specific factors could contribute to increases in NLR, GLR, and PLR ratios during DI. As for the increase in PLR, it did not predict the development of long-lasting immune diseases during DI, in contrast to 2 months of head-down tilt bed rest (HDBR), another spaceflight analog. These data show that the NLR, GLR, and PLR ratios are promising biomarkers that deserve further study to determine the relationships between their increase and microgravity-induced deconditioning. These dry immersion investigations are registered at clinicaltrials.gov as NCT05043974 for women and NCT05493176 for men.</p>","PeriodicalId":50455,"journal":{"name":"The FASEB Journal","volume":"39 17","pages":""},"PeriodicalIF":4.2000,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://faseb.onlinelibrary.wiley.com/doi/epdf/10.1096/fj.202502198R","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The FASEB Journal","FirstCategoryId":"99","ListUrlMain":"https://faseb.onlinelibrary.wiley.com/doi/10.1096/fj.202502198R","RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"BIOCHEMISTRY & MOLECULAR BIOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
With future manned space projects involving missions of unprecedented duration, multisystem deconditioning induced by spaceflight could seriously affect the well-being and health of astronauts. Safe and easily determined in-flight biomarkers are therefore needed to monitor health status. In this study, we simulated space deconditioning with a 5-day dry immersion (DI) of 18 healthy women and 19 healthy men and evaluated the effects of this protocol on three biomarkers: the neutrophil-to-lymphocyte ratio (NLR), the granulocyte-to-lymphocyte ratio (GLR) and the platelet-to-lymphocyte ratio (PLR). Increases in all three ratios were observed in both men and women, as also observed at the end of a space mission or after exposure to simulated microgravity. These increases were associated with physical and psychological stress in both sexes. Furthermore, our work suggested a positive link between NLR increase and cardiovascular system alteration in women, whereas in men, there would be a positive relationship between NLR, GLR, PLR, and inflammation. Thus, in addition to physical and psychological stress, sex-specific factors could contribute to increases in NLR, GLR, and PLR ratios during DI. As for the increase in PLR, it did not predict the development of long-lasting immune diseases during DI, in contrast to 2 months of head-down tilt bed rest (HDBR), another spaceflight analog. These data show that the NLR, GLR, and PLR ratios are promising biomarkers that deserve further study to determine the relationships between their increase and microgravity-induced deconditioning. These dry immersion investigations are registered at clinicaltrials.gov as NCT05043974 for women and NCT05493176 for men.
期刊介绍:
The FASEB Journal publishes international, transdisciplinary research covering all fields of biology at every level of organization: atomic, molecular, cell, tissue, organ, organismic and population. While the journal strives to include research that cuts across the biological sciences, it also considers submissions that lie within one field, but may have implications for other fields as well. The journal seeks to publish basic and translational research, but also welcomes reports of pre-clinical and early clinical research. In addition to research, review, and hypothesis submissions, The FASEB Journal also seeks perspectives, commentaries, book reviews, and similar content related to the life sciences in its Up Front section.