Erschienen in:
01.02.2013 | Original Research
Immune System Dysregulation Occurs During Short Duration Spaceflight On Board the Space Shuttle
verfasst von:
Brian Crucian, Raymond Stowe, Satish Mehta, Peter Uchakin, Heather Quiriarte, Duane Pierson, Clarence Sams
Erschienen in:
Journal of Clinical Immunology
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Ausgabe 2/2013
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Abstract
Background
Post-flight data suggests immunity is dysregulated immediately following spaceflight, however this data may be influenced by the stress effects of high-G entry and readaptation to terrestrial gravity. It is unknown if immunity is altered during spaceflight.
Methods
Blood samples were collected from 19 US Astronauts onboard the Space Shuttle ~24 h prior to landing and returned for terrestrial analysis. Assays consisted of leukocyte distribution, T cell blastogenesis and cytokine production profiles.
Results
Most bulk leukocyte subsets (WBC, differential, lymphocyte subsets) were unaltered during spaceflight, but were altered following landing. CD8+ T cell subsets, including cytotoxic, central memory and senescent were altered during spaceflight. T cell early blastogenesis varied by culture mitogen. Functional responses to staphylococcal enterotoxin were reduced during and following spaceflight, whereas response to anti-CD3/28 antibodies was elevated post-flight. The level of virus specific T cells were generally unaltered, however virus specific T cell function was depressed both during and following flight. Plasma levels of IFNα, IFNγ, IL-1β, IL-4, IL-10, IL-12, and TNFα were significantly elevated in-flight, while IL-6 was significantly elevated at R + 0. Cytokine production profiles following mitogenic stimulation were significantly altered both during, and following spaceflight. Specifically, production of IFNγ, IL-17 and IL-10 were reduced, but production of TNFα and IL-8 were elevated during spaceflight.
Conclusions
This study indicates that specific parameters among leukocyte distribution, T cell function and cytokine production profiles are altered during flight. These findings distinguish in-flight dysregulation from stress-related alterations observed immediately following landing.