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Synaptophysin: a reliable marker for medulloblastomas.

K Schwechheimer, B Wiedenmann, W W Franke

    Virchows Archiv. A, Pathological Anatomy and Histopathology
    |January 1, 1987
    PubMed
    Summary
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    Synaptophysin is a reliable marker for medulloblastomas and other neuronal tumors. This study found synaptophysin expression in medulloblastomas and neuroblastomas, outperforming intermediate filament proteins as a diagnostic marker.

    Area of Science:

    • Neuroscience
    • Oncology
    • Cell Biology

    Background:

    • Synaptophysin is an integral membrane glycoprotein found in presynaptic vesicles of neurons and neuroendocrine cells.
    • Tumors derived from these cells can also express synaptophysin.
    • Intermediate-sized filament (IF) proteins have variable expression patterns in neuronal tumors.

    Purpose of the Study:

    • To evaluate synaptophysin as a reliable diagnostic marker for medulloblastomas and other neuronal tumors.
    • To compare the expression patterns of synaptophysin with intermediate filament proteins in these tumors.

    Main Methods:

    • Indirect immunofluorescence microscopy using the monoclonal antibody SY 38 to detect synaptophysin.
    • Biochemical confirmation of synaptophysin presence in medulloblastomas via immunoblotting.

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  • Immunocytochemistry to examine the expression of neurofilament and vimentin proteins.

    • Main Results:

    • Consistent positive immunoreactivity for synaptophysin was observed in all tested medulloblastomas (n=6) and neuroblastomas (n=3), as well as in a ganglioneuroma and a glioneuronal hamartoma.
    • Synaptophysin presence in medulloblastomas was biochemically confirmed.
    • Intermediate filament protein expression was heterogeneous in medulloblastomas, with distinct neurofilament-positive and vimentin-expressing subtypes identified.

    Conclusions:

    • Synaptophysin serves as a dependable and superior marker for diagnosing medulloblastomas and other differentiated or undifferentiated neuronal tumors compared to intermediate filament proteins.
    • The heterogeneous expression of IF proteins in medulloblastomas necessitates alternative diagnostic markers like synaptophysin.