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The modulation of astrocytic differentiation in cells derived from a medulloblastoma surgical specimen

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Abstract

Medulloblastomas are cerebellar tumors which are primarily composed of sheets of uniform, small malignant cells and may have astrocytic, neuronal or no features typical of these cell types. The assessment of astrocytic differentiation in medulloblastoma rests largely on the detection in malignant cells of glial fibrillary acidic protein (GFAP), a marker present in the later stages of normal astrocyte differentiation. It is still not known whether cells that do not contain GFAP in medulloblastomas with astrocytic differentiation correspond to highly proliferative astrocyte progenitors in maturation arrest at earlier stages of differentiation. The purpose of the current study was to examine whether cells in short term culture derived from a medulloblastoma tumor specimen with astrocytic differentiation were of the astrocytic lineage and if so, whether they represented proliferative astrocyte progenitors which would morphologically and antigenically mature in response to differentiating agents. A portion of tumor specimen from a 10-month-old child with recurrent posterior fossa medulloblastoma (RB2) that contained GFAP focally in tumor cells was grown in monolayer culture. We examined cellular structure and appearance of western immunoblotting and immunohistochemical studies for GFAP and neuron-specific enolase (NSE) in RB2 cells before and after treatment with retinoic acid (RA) and dibutyryl cyclic AMP (dBcAMP). RB2 in culture consisted of small polygonal cells (93%), large flat cells (3%), and polygonal cells with cytoplasmic processes (4%). In untreated RB2, 30% of cells expressed GFAP and staining for NSE was negative. RA treatment produced flattened cells and decreased GFAP. DBcAMP reversibly induced fine cytoplasmic processes containing GFAP in 85% of cells within 96h. Neither agent induced NSE. The results suggest that cultured cells which are derived from a medulloblastoma with astrocytic differentiation do not spontaneously differentiate but that treatment with dBcAMP suppresses proliferation, enhances cytoplasmic process formation and increases cytoplasmic GFAP. Cells in culture and in medulloblastoma tumor specimens which do not contain GFAP may represent astrocyte progenitors in maturation arrest.

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Authors and Affiliations

  1. Department of Neuro-Oncology, The University of Texas and M.D. Anderson Cancer Center, 1515 Holcombe Blvd, 77030, Houston, TX, USA

    Bernard L. Maria, Peter A. Steck & W. K. Alfred Yung

  2. Department of Experimental Pathology, The University of Texas and M.D. Anderson Cancer Center, 1515 Holcombe Blvd, 77030, Houston, TX, USA

    Antonio Milici & Frederick F. Becker

  3. Department of Neuropathology, The University of Texas and M.D. Anderson Cancer Center, 1515 Holcombe Blvd, 77030, Houston, TX, USA

    Janet M. Bruner

  4. Department of Cell Biology, The University of Texas and M.D. Anderson Cancer Center, 1515 Holcombe Blvd, 77030, Houston, TX, USA

    Sen Pathak

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  1. Bernard L. Maria
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  2. Peter A. Steck
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  3. W. K. Alfred Yung
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  4. Antonio Milici
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  5. Janet M. Bruner
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  6. Sen Pathak
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  7. Frederick F. Becker
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Maria, B.L., Steck, P.A., Yung, W.K.A. et al. The modulation of astrocytic differentiation in cells derived from a medulloblastoma surgical specimen. J Neuro-Oncol 7, 329–338 (1989). https://doi.org/10.1007/BF02147090

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