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Methionine utilization in long-term human lymphoid cell lines

L Guarini, J A Sturman, G E Gaull

    Journal of Cellular Physiology
    |March 1, 1981
    PubMed
    Summary

    Long-term lymphoid cell lines (LTL) primarily use methionine for protein synthesis. High cell density disrupts this, limiting polyamine synthesis despite S-adenosylmethionine (SAM) accumulation.

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    Area of Science:

    • Cell Biology
    • Biochemistry
    • Metabolism

    Background:

    • Long-term lymphoid cell lines (LTL) are crucial models for studying cellular processes.
    • Methionine metabolism is vital, supporting protein synthesis and polyamine production.
    • Cell density is a known factor influencing cellular behavior and metabolism.

    Purpose of the Study:

    • To investigate the metabolic fate of methionine in LTL under varying cell densities.
    • To understand the impact of high cell density on protein synthesis and polyamine production.
    • To elucidate the relationship between S-adenosylmethionine (SAM) levels and polyamine synthesis under stress conditions.

    Main Methods:

    • Culturing LTL under normal and high cell density conditions.
    • Quantifying methionine incorporation into proteins.
    • Measuring levels of S-adenosylmethionine (SAM) and polyamines (spermidine, spermine).

    Main Results:

    • Under normal conditions, LTL utilize methionine for both protein synthesis and conversion to SAM for polyamine synthesis.
    • High cell density initially supports rapid protein synthesis and SAM accumulation.
    • Polyamine synthesis is significantly reduced at high cell densities, irrespective of SAM availability.

    Conclusions:

    • High cell density imposes a metabolic shift in LTL, prioritizing processes other than polyamine synthesis.
    • Methionine metabolism is tightly regulated and sensitive to environmental cues like cell density.
    • Further research is needed to understand the specific regulatory mechanisms underlying this density-dependent metabolic alteration.

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