Summary
The D283 Med human medulloblastoma cell line and primary explants of five surgically excised medulloblastomas were cultured using a three-dimensional Gelfoam matrix system. The cultures were evaluated immunohistochemically for a series of antigenic determinants associated with neuronal or glial differentiation. Focal immunolocalization of class III β-tubulin, microtubule-associated protein 2 (MAP2), and to a lesser degree tau, was demonstrated in all cultures. Class III β-tubulin isotype, MAP2, and tau protein were also detected by immunoblot in Gelfoam matrix cultures, monolayer cultures, and suspension cultures of D283 Med cells. Staining for neurofilament protein epitopes was highly variable, even among different cultures derived from the same original tumour, but time-dependent changes in neurofilament protein, which may have reflected neuronal differentiation, were not consistently shown. Widespread γ-enolase and focal synaptophysin reactivities were visualized in all cultures, but no S-antigen staining was detected. Leu 7 labelling was variably present in half of the cultures of D283 Med cells, but was more abundant in explants derived from four of the five original tumours. Vimentin was consistently found in D283 Med cultures at all time points. No immunoreactivity for glial fibrillary acidic protein was detected in the D283 Med cell line. Conversely, staining for this protein was demonstrated in scattered astrocytic cells in the surgical specimens of all five medulloblastomas. Concomitant with increased time in culture, three of the primary tumours displayed increased numbers of glial fibrillary acidic protein-positive cells when cultured in the Gelfoam system, but the other two tumours had a minimal astrocytic component. Collectively, our findings indicate that the D283 Med cell line and explants of five primary medulloblastomas exhibit a chiefly neuroblastic phenotype.
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Vinores, S.A., Herman, M.M., Katsetos, C.D. et al. Neuron-associated class III β-tubulin, tau, and MAP2 in the D-283 Med cell line and in primary explants of human medulloblastoma. Histochem J 26, 678–685 (1994). https://doi.org/10.1007/BF00158293
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DOI: https://doi.org/10.1007/BF00158293