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Is spaceflight-induced immune dysfunction linked to systemic changes in metabolism?

Michael J Pecaut1, Xiao Wen Mao1, Denise L Bellinger2

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Space shuttle missions impacted mouse immune and metabolic systems. Spaceflight altered spleen cell populations and liver metabolism, suggesting a link between immune and metabolic changes during space travel.

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Area of Science:

  • Space biology
  • Immunology
  • Metabolomics

Background:

  • The final Space Shuttle mission (STS-135) provided an opportunity to study spaceflight effects on biological systems.
  • Mice were utilized as a model organism to investigate physiological changes during space travel.

Purpose of the Study:

  • To characterize the effects of spaceflight on immune cell phenotype, adrenal gland hormones, and liver gene/metabolite profiles.
  • To investigate potential links between immune function and metabolic alterations induced by spaceflight.

Main Methods:

  • Analysis of splenic leukocyte subsets and phagocytic function.
  • Measurement of catecholamine and corticosterone levels in adrenal glands.
  • Transcriptomic and metabolomic profiling of liver tissue.
  • Comparison of spaceflight samples with ground controls.

Main Results:

  • Decreased splenic leukocyte subsets but increased reactive oxygen species (ROS)-related activity.
  • Elevated corticosterone levels in adrenals and liver, with no significant change in catecholamines.
  • Gene expression and metabolomic data suggested increased phagocytic activity and fatty acid oxidation, with decreased glycolysis, not indicative of oxidative or psychological stress.

Conclusions:

  • Spaceflight induces complex changes in immune and metabolic functions in mice.
  • The findings suggest a potential link between immune and metabolic dysregulation during spaceflight, similar to ground-based diseases.
  • Further research is needed to understand the mechanisms behind these spaceflight-induced adaptations.