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Telomerase Activity and Microgravity- Dependent Apoptosis in Human Leukemia HL- 60 Cells
Mammalian cells subjected to conditions of spaceflight and the microgravity environment ofspace; manifest a number of alterations in structure and function. Among the most notable changes incells flown on the Space Shuttle are reduced growth activation and decline in growth rate in the totalpopulation[1-3]. Other changes include chromosomal aberrations[4], inhibited locomotion[5] , alteredcytokine production[6, 7], changes in PKC distribution[8] , and increased apoptosis[3]. Human lymphocytesrespond poorly to mitogenic stimulation in microgravity[2] and cells of the lymphoblastoid T cell line,Jurkat, are growth arrested[3].
