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Related Experiment Videos

Lymphatic tissue changes in rats flown on Spacelab Life Sciences-2

C C Congdon1, Z Allebban, L A Gibson

  • 1Department of Medical Biology, University of Tennessee Medical Center at Knoxville 37920, USA.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|July 1, 1996
PubMed
Summary

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Spaceflight caused temporary changes in rat lymphatic tissues, including thymus and spleen, shortly after landing. This apoptosis-related response was linked to readaptation to gravity, not observed in flight.

Area of Science:

  • Space biology
  • Immunology
  • Cellular biology

Background:

  • Spaceflight impacts physiological systems, including the immune system.
  • Lymphatic tissues play a crucial role in immune response and adaptation.

Purpose of the Study:

  • To investigate the effects of spaceflight on rat lymphatic tissues.
  • To determine the cellular mechanisms behind observed changes.
  • To assess the role of gravitational stress in post-flight immune alterations.

Main Methods:

  • Analysis of thymus, spleen, lymph node, and bone marrow specimens from rats aboard Spacelab Life Sciences-2.
  • Tissue section staining and in situ labeling of fragmented DNA using ApopTag reagents.
  • Microscopic examination for tingible body-containing macrophages and apoptotic activity.
Keywords:
NASA Discipline Number 00-00NASA Discipline Number 18-10NASA Discipline Regulatory PhysiologyNASA Program FlightNASA Program Space Physiology and CountermeasuresNon-NASA Center

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Main Results:

  • A transient increase in tingible body-containing macrophages was observed in lymphatic tissues hours after landing.
  • In situ labeling confirmed apoptosis within these macrophages.
  • These changes were not present 9 days post-flight or in rats sampled during flight.

Conclusions:

  • Spaceflight induces a transient retrogressive change in lymphatic tissues.
  • This change is characterized by apoptosis in macrophages.
  • Gravitational stress during readaptation to 1 G is the likely cause of these transient immune alterations.