Effects of space flight and IGF-1 on immune function

We tested the hypothesis that insulin-like growth factor-1 (IGF-1) would ameliorate space flight-induced effects on the immune system. Twelve male, Sprague-Dawley rats, surgically implanted with mini osmotic pumps, were subjected to space flight for 10 days on STS-77. Six rats received 10 mg/kg/day...

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Veröffentlicht in:Advances in space research 1999, Vol.23 (12), p.1955-1964
Hauptverfasser: Chapes, S.K., Simske, S.J., Forsman, A.D., Bateman, T.A., Zimmerman, R.J.
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container_end_page 1964
container_issue 12
container_start_page 1955
container_title Advances in space research
container_volume 23
creator Chapes, S.K.
Simske, S.J.
Forsman, A.D.
Bateman, T.A.
Zimmerman, R.J.
description We tested the hypothesis that insulin-like growth factor-1 (IGF-1) would ameliorate space flight-induced effects on the immune system. Twelve male, Sprague-Dawley rats, surgically implanted with mini osmotic pumps, were subjected to space flight for 10 days on STS-77. Six rats received 10 mg/kg/day of IGF-1 and 6 rats received saline. Flight animals had a lymphocytopenia and granulocytosis which were reversed by IGF-1. Flight animals had significantly higher corticosterone levels than ground controls but IGF-1 did not impact this stress hormone. Therefore, the reversed granulocytosis did not correlate with serum corticosterone. Space flight and IGF-1 also combined to induce a monocytopenia that was not evident in ground control animals treated with IGF-1 or in animals subjected to space flight but given physiological saline. There was a significant increase in spleen weights in vivarium animals treated with IGF-1, however, this change did not occur in flight animals. We observed reduced agonist-induced lymph node cell proliferation by cells from flight animals compared to ground controls. The reduced proliferation was not augmented by IGF-1 treatment. There was enhanced secretion of TNF, IL-6 and NO by flight-animal peritoneal macrophages compared to vivarium controls, however, O 2 secretion was not affected. These data suggest that IGF-1 can ameliorate some of the effects of space flight but that space flight can also impact the normal response to IGF-1.
doi_str_mv 10.1016/S0273-1177(99)00456-1
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Twelve male, Sprague-Dawley rats, surgically implanted with mini osmotic pumps, were subjected to space flight for 10 days on STS-77. Six rats received 10 mg/kg/day of IGF-1 and 6 rats received saline. Flight animals had a lymphocytopenia and granulocytosis which were reversed by IGF-1. Flight animals had significantly higher corticosterone levels than ground controls but IGF-1 did not impact this stress hormone. Therefore, the reversed granulocytosis did not correlate with serum corticosterone. Space flight and IGF-1 also combined to induce a monocytopenia that was not evident in ground control animals treated with IGF-1 or in animals subjected to space flight but given physiological saline. There was a significant increase in spleen weights in vivarium animals treated with IGF-1, however, this change did not occur in flight animals. We observed reduced agonist-induced lymph node cell proliferation by cells from flight animals compared to ground controls. The reduced proliferation was not augmented by IGF-1 treatment. There was enhanced secretion of TNF, IL-6 and NO by flight-animal peritoneal macrophages compared to vivarium controls, however, O 2 secretion was not affected. 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subjects Animals
Corticosterone - metabolism
Cytokines - metabolism
Insulin-Like Growth Factor I - immunology
Insulin-Like Growth Factor I - pharmacology
Lymphocyte Activation - drug effects
Lymphocyte Activation - physiology
Lymphocytes - drug effects
Lymphocytes - immunology
Lymphocytes - physiology
Macrophage Colony-Stimulating Factor - metabolism
Macrophages - drug effects
Macrophages - immunology
Macrophages - physiology
Male
Nitric Oxide - metabolism
Organ Size
Rats
Rats, Sprague-Dawley
Space Flight
Space life sciences
Spleen - cytology
Spleen - physiology
Thymus Gland - cytology
Thymus Gland - physiology
Weightlessness
title Effects of space flight and IGF-1 on immune function
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