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Tumor growth and immune function in mice during hind-limb unloading
Erica H Lee1, Wanhong Ding, Anil D Kulkarni
1Department of Dermatology, Joan and Sanford I. Weill Medical College of Cornell University, New York, NY 10021, USA.
Aviation, Space, and Environmental Medicine
|June 11, 2005
Summary
Spaceflight conditions impair anti-tumor immunity, leading to increased tumor growth in mice. This suggests spaceflight negatively impacts the host immune response against tumors.
Area of Science:
- Immunology
- Space Medicine
- Oncology
Background:
- Spaceflight alters immune parameters, decreasing resistance to infections.
- The impact of spaceflight on tumor immunity remains largely unexplored.
Purpose of the Study:
- To investigate the effect of spaceflight conditions on tumor immunity using a murine model.
- To assess tumor growth and immune reactivity under simulated microgravity.
Main Methods:
- Utilized the hindlimb unloading (HU) murine model to simulate spaceflight.
- Compared tumor growth and splenic mass in HU mice versus controls.
- Employed severe combined immunodeficiency (SCID) mice to evaluate the role of host immunity.
Main Results:
- Hindlimb unloading significantly increased tumor growth and splenic atrophy.
- A diminished delayed-type hypersensitivity response to tumor antigens was observed in HU mice.
- Immunodeficient mice showed no difference in tumor growth, indicating a role for host immunity.
Conclusions:
- Antitumor immunity is inhibited under simulated spaceflight conditions (antiorthostatic suspension).
- Hindlimb unloading alters host immunity, impacting tumor progression.
- Further research is needed to understand spaceflight's effects on immunity, carcinogenesis, and tumor growth.