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ATP uptake by mouse lymphoma cells.

M F De Castro, S R Ayad

    Anticancer Research
    |January 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Mouse lymphoma cells require sufficient intracellular adenosine triphosphate (ATP) to produce cyclic adenosine monophosphate (cAMP) in response to prostaglandin E1 (PGE1). Low ATP levels prevent this response, highlighting ATP

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    Area of Science:

    • Cellular biochemistry
    • Signal transduction pathways

    Background:

    • Mouse lymphoma cells exhibit unresponsiveness to prostaglandin E1 (PGE1) regarding cyclic adenosine monophosphate (cAMP) production.
    • Endogenous adenosine triphosphate (ATP) levels in these cells are notably low.

    Purpose of the Study:

    • To investigate the role of intracellular ATP concentration in mediating cellular responses to PGE1.
    • To determine if ATP is a prerequisite for PGE1-induced cAMP production in mouse lymphoma cells.

    Main Methods:

    • Incubation of mouse lymphoma cells with varying concentrations of ATP and its analogues.
    • Manipulation of intracellular ATP levels using metabolic inhibitors like iodoacetate and potassium cyanide.
    • Measurement of intracellular ATP and cAMP levels using biochemical assays.

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    Main Results:

    • Supplementation with ATP, in the presence of IBMX, elevated intracellular ATP and restored PGE1-induced cAMP production.
    • The effect of ATP was specific, as guanosine triphosphate (GTP) could not substitute for ATP.
    • An ATP analogue, AMP-PCP, mimicked the effect of ATP, while inhibitors of ATP synthesis drastically reduced cAMP levels.

    Conclusions:

    • Adequate intracellular ATP levels are essential for mouse lymphoma cells to respond to PGE1 by increasing cAMP production.
    • This study elucidates a critical dependency on ATP for a specific signal transduction pathway.