Effects of Space Flight on Neutrophil Functions in Astronauts

Valadez, Victoria A. ; Pierson, Duane L. ; Simons, Elizabeth R. ; Kaur, Indreshpal

PID  :  NTRS Document ID: 20100029738
RP-ID  :  JSC-CN-6357

学科分类：医学（综合）

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Neutrophil phagocytosis, oxidative burst, degranulation, and the expression of selected surface markers were studied in 25 astronauts following 4 space shuttle missions. Space flight duration ranged from 5 to 11 days. Blood specimens were obtained 10 days before launch, immediately after landing, and again at 3 days after landing. The number of neutrophils increased at landing by 85%. Phagocytosis of Escherichia coli (E. coli) and oxidative burst following the medium length (9 to 11 days) missions were lower than the control mean values. Whereas, following the short-duration (5 days) mission, these functions were unchanged from control values. No consistent changes in degranulation were observed following either short or medium length space missions. The expression of CD16, CD32, CD11a, CD11b, CD11c, L-selectin and CD36 were measured and found to be variable. Specifically, CD16 and CD32 did not correlate with the changes in oxidative burst. Mission duration appears to be a factor in phagocytic and oxidative functions.