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Coherence between Brain Cortical Function and Neurocognitive Performance during Changed Gravity Conditions

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Effects of space flight on surface marker expression.

¹Department of General Surgery Research, Carolinas Medical Center, Charlotte, NC 28232-2861, USA.

Advances in Space Research : the Official Journal of the Committee on Space Research (COSPAR)

|September 7, 2001

Summary

Space flight alters immune cell surface markers, including CD4 and CD8, affecting immune responses. These changes vary based on flight conditions and tissue type, with their full biological significance still under investigation.

Keywords:

NASA Discipline Cell Biology Non-NASA Center

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Area of Science:

Immunology
Space Biology
Cell Biology

Background:

Space flight impacts the immune system.
Cell surface markers are crucial for immune regulation.
Previous studies indicate alterations in immune cell markers due to space travel.

Purpose of the Study:

To investigate the effects of space flight on cell surface marker expression.
To determine if immune responses to space flight are compartmentalized.
To explore potential impacts on immune cell differentiation.

Main Methods:

Analysis of blood and tissue samples (spleen, thymus, lymph nodes, bone marrow) from humans, rats, and monkeys post-space flight.
Examination of cell surface markers like CD4 and CD8.
Investigation of cell adhesion molecules (integrins).
Cell culture studies on precursor cell differentiation.

Main Results:

Space flight demonstrably alters the expression of cell surface markers.
Changes in marker expression depend on flight conditions.
Compartmentalization of immune responses was observed, with differences between blood and local immune tissues.
Integrin expression differed between lymph node cells and splenocytes in rats post-flight.
Potential inhibition of macrophage differentiation was noted in cell cultures.

Conclusions:

Space flight induces significant alterations in cell surface marker expression.
The immune response to space flight can be compartmentalized across different tissues.
Further research is needed to establish the biological significance of these observed changes.