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[Lipid peroxidation in microalgae cells under simulated microgravity].

Gen-bao Li, Gao-hong Wang, Li-rong Song

    Hang Tian Yi Xue Yu Yi Xue Gong Cheng = Space Medicine & Medical Engineering
    |November 9, 2002
    PubMed
    Summary
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    Microgravity increases lipid peroxidation and membrane permeability in microalgae cells. This suggests cellular membranes may perceive gravity in unicellular organisms lacking specialized structures.

    Area of Science:

    • * Space biology
    • * Astrobiology
    • * Cell biology

    Background:

    • * The effects of microgravity on cellular structures are not fully understood.
    • * Investigating cellular responses to microgravity is crucial for space exploration and understanding fundamental biological processes.
    • * Plasma membrane integrity and function are vital for cell survival and response to environmental stimuli.

    Purpose of the Study:

    • * To provide direct evidence of microgravity's impact on the structure and function of the plasma membrane.
    • * To investigate the role of lipid peroxidation and membrane permeability under simulated microgravity conditions.
    • * To explore the potential of cellular membranes as gravity-sensing structures in unicellular organisms.

    Main Methods:

    • * Measurement of malondialdehyde (MDA) content using a quantitative thiobarbituric acid (TBA) reaction to assess lipid peroxidation.

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  • * Determination of electrolyte leakage using a DDS-11A conductometer to evaluate membrane permeability.
  • * Experiments conducted on two microalgae species: Anabaena sp PCC7120 and Synechococcus 7942.

    • Main Results:

    • * Simulated microgravity led to increased lipid peroxidation, indicated by higher MDA content.
    • * A significant increase in membrane permeability was observed in both Anabaena sp PCC7120 and Synechococcus 7942 cells.
    • * These findings demonstrate a direct effect of microgravity on plasma membrane integrity.

    Conclusions:

    • * Microgravity stress induces cellular damage, specifically affecting the plasma membrane.
    • * The observed changes in membrane structure and function under microgravity share similarities with responses to other environmental stresses.
    • * Cellular membranes may function as gravity perception sites in unicellular organisms lacking specialized gravity-sensing organelles.