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Related Experiment Videos

Polyamine metabolism during cardiac hypertrophy.

A E Pegg, H Hibasami

    The American Journal of Physiology
    |November 1, 1980
    PubMed
    Summary

    Thyroxine treatment increased heart polyamines by boosting putrescine and decarboxylated S-adenosylmethionine. Inhibiting polyamine synthesis did not prevent thyroxine-induced cardiac hypertrophy, suggesting polyamines are not essential for this response.

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    Area of Science:

    • Biochemistry
    • Cardiology
    • Molecular Biology

    Background:

    • Thyroid hormones, like thyroxine, are known to induce cardiac hypertrophy.
    • Polyamines are crucial for cell growth and proliferation.
    • The role of polyamines in thyroid hormone-induced cardiac hypertrophy is not fully understood.

    Purpose of the Study:

    • To investigate the effect of thyroxine on polyamine metabolism in the rat heart.
    • To determine the contribution of specific enzymes and precursors to polyamine accumulation during cardiac hypertrophy.
    • To assess whether polyamine synthesis is essential for thyroxine-induced cardiac hypertrophy.

    Main Methods:

    • Rats were treated with thyroxine for 7 days to induce myocardial hypertrophy.
    • Heart tissue polyamine content, enzyme activities (ornithine decarboxylase, S-adenosylmethionine decarboxylase, spermine synthase, spermidine synthase), and enzyme protein levels were measured.
    • The effect of 1,3-diamino-2-propanol, an inhibitor of ornithine decarboxylase, on polyamine levels and cardiac hypertrophy was evaluated.

    Main Results:

    • Thyroxine treatment significantly increased putrescine, spermidine, and spermine content in the rat heart.
    • Activities and protein levels of ornithine decarboxylase and S-adenosylmethionine decarboxylase were elevated, leading to increased decarboxylated S-adenosylmethionine.
    • Inhibition of polyamine synthesis with 1,3-diamino-2-propanol prevented polyamine accumulation but did not inhibit cardiac hypertrophy.

    Conclusions:

    • Thyroxine-induced cardiac polyamine accumulation is primarily mediated by increased putrescine and decarboxylated S-adenosylmethionine availability.
    • The enhanced synthesis is due to increased enzyme protein for S-adenosylmethionine decarboxylase and elevated putrescine activating the enzyme.
    • Increased polyamine content is not essential for the development of thyroxine-induced cardiac hypertrophy.

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