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Na+/K+ ATPase and cell growth IV: a metabolic marker of human brain tumors?

R Verna, P Nardi, R Muraro

    Journal of Neurosurgical Sciences
    |April 1, 1983
    PubMed

    Insights

    Researchers investigated enzyme activity and cyclic nucleotide levels in human brain tumors. Na+/K+ ATPase and cAMP decreased with tumor malignancy, suggesting Na+/K+ ATPase as a potential malignancy marker.

    Area of Science:

    • Neuroscience
    • Biochemistry
    • Oncology

    Background:

    • Brain tumors exhibit altered cellular metabolism compared to normal brain tissue.
    • Enzyme activities and cyclic nucleotide levels are key indicators of cellular function and disease states.

    Purpose of the Study:

    • To investigate the activity of Mg++ dependent and Na+/K+ ATPase, and the content of cAMP and cGMP in human brain tumor homogenates.
    • To compare these biochemical parameters in tumors with normal brain cortex.
    • To assess the relationship between these parameters and the degree of tumor malignancy.

    Main Methods:

    • Analysis of total, Mg++ dependent, and Na+/K+ ATPase activity in human brain tumor homogenates.
    • Quantification of cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP) levels in tumor homogenates.
    • Comparison of biochemical data from tumor samples with those from normal brain cortices.

    Main Results:

    • Na+/K+ ATPase activity and cAMP levels were significantly decreased in brain tumors compared to normal cortex.
    • A strong correlation was observed between decreased Na+/K+ ATPase activity/cAMP levels and the degree of tumor malignancy.
    • Mg++ dependent ATPase activity was lower in tumors but showed no significant variation across different tumor types.
    • cGMP levels remained unaffected in brain tumors compared to normal tissue.

    Conclusions:

    • The study suggests that Na+/K+ ATPase activity can serve as a valuable marker for assessing the malignancy of neoplastic brain growth.
    • Altered ATPase activity and cAMP levels are indicative of disturbed cellular metabolism in brain tumors.
    • Further research into brain tumor metabolism may reveal new diagnostic and therapeutic targets.

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