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Related Experiment Videos

Barium modulates c-fos expression and post-translational modification.

T Curran, J I Morgan

    Proceedings of the National Academy of Sciences of the United States of America
    |November 1, 1986
    PubMed
    Summary
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    Barium ions transiently induce the c-fos gene in PC12 cells by entering through calcium channels and interacting with calmodulin. This mechanism differs from other cations and growth factors, affecting c-fos protein modification.

    Area of Science:

    • Neuroscience
    • Molecular Biology
    • Cell Biology

    Background:

    • The c-fos gene is a crucial immediate-early gene involved in cellular responses.
    • PC12 rat pheochromocytoma cells are a standard model for studying neuronal differentiation and gene expression.

    Purpose of the Study:

    • To investigate the mechanism by which barium ions induce c-fos gene expression in PC12 cells.
    • To differentiate the signaling pathways of barium-induced c-fos expression from other known inducers.

    Main Methods:

    • Treatment of PC12 cells with exogenous barium ions.
    • Assessment of c-fos gene induction.
    • Examination of the effects of extracellular calcium, calcium channel blockers, and calmodulin inhibitors.
    • Analysis of c-fos protein post-translational modifications using SDS-PAGE.

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    Main Results:

    • Barium ions transiently induce c-fos gene expression in PC12 cells.
    • This induction is inhibited by extracellular calcium and dihydropyridine calcium channel blockers.
    • Calmodulin inhibitors attenuate barium-induced c-fos expression.
    • Barium-induced c-fos protein shows less post-translational modification compared to that induced by growth factors or phorbol esters.

    Conclusions:

    • Barium ions likely enter PC12 cells via voltage-dependent calcium channels.
    • Barium interacts with calmodulin to stimulate c-fos expression, representing a distinct pathway.
    • The distinct post-translational modification of c-fos protein induced by barium suggests differential signaling cascades.