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Chromogranin A: implications for hypertension.

D T O'Connor

    Journal of Hypertension. Supplement : Official Journal of the International Society of Hypertension
    |December 1, 1984
    PubMed
    Summary
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    Chromogranin A, a protein released with catecholamines, was purified. Assays show elevated levels in hypertension and significantly higher levels in phaeochromocytoma patients, indicating its link to sympathoadrenal activity.

    Area of Science:

    • Biochemistry
    • Endocrinology
    • Neuroscience

    Background:

    • Chromogranin A is a key soluble protein co-stored and co-released via exocytosis with catecholamines from chromaffin granules.
    • This protein is found in both bovine adrenomedullary and human phaeochromocytoma chromaffin granules.

    Purpose of the Study:

    • To purify Chromogranin A to homogeneity from bovine and human sources.
    • To develop radio-immunoassays for bovine and human Chromogranin A.
    • To investigate the presence and levels of Chromogranin A immunoreactivity in tissues and plasma, particularly in relation to hypertension and phaeochromocytoma.

    Main Methods:

    • Purification of Chromogranin A from bovine adrenomedullary and human phaeochromocytoma chromaffin granules.
    • Development of radio-immunoassays for bovine and human Chromogranin A.

    Related Experiment Videos

  • Measurement of Chromogranin A immunoreactivity in adrenergic tissues, subcellular fractions, serum, and plasma.

    • Main Results:

    • Chromogranin A was purified as an acidic monomeric protein from both sources.
    • Radio-immunoassays successfully detected Chromogranin A immunoreactivity.
    • Human plasma showed moderately elevated Chromogranin A (1.5-fold) in essential hypertension and substantially elevated levels (12.5-fold) in phaeochromocytoma.
    • Initial studies suggest plasma Chromogranin A levels correlate with sympathoadrenal activity.

    Conclusions:

    • Chromogranin A can be purified and reliably assayed.
    • Plasma Chromogranin A levels are significantly altered in conditions like phaeochromocytoma and essential hypertension.
    • Further research is needed to pinpoint the exact source of plasma Chromogranin A and fully elucidate its physiological role in sympathoadrenal activity.