The stabilization of cell proliferation and its reversal in the microgravity environment

Physics – Medical Physics

Scientific paper

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Aerospace Bio- And Medical Physics

Scientific paper

Studies conducted on two recent shuttle missions (STS-69 and STS-73) have shown that cell cycle arrest of human myeloma IM-9 cells, mediated by a purified cell regulatory sialoglycopeptide (CeReS-18), can maintain cells in a stabilized condition for several days prior to launch. In addition, when the orbiter reached the microgravity environment, the inhibition was readily reversed by a simple dilution of the concentration of the inhibitory CeReS-18. This was accomplished by the introduction of fresh culture medium, without inhibitor. The previously stabilized cell population then rapidly initiated a renewal of cell cycling. Since it has been previously shown that the ability of CeReS-18 to stabilize cell populations in a nonproliferating state was calcium ion dependent (Betz et al. 1994, Betz et al. 1995) the current studies included the use of culture medium containing either high (0.42 mM) or low (0.042 mM) calcium concentrations.

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