Glioma biology in vitro: goals and concepts.

Gliomas are heterogeneous in their cellular composition, affecting therapeutic efforts such as surgical removal, radiotherapy, chemotherapy and immunotherapy. 106 gliomas were taken into culture in our laboratory and 12 cell lines could be established there from. Experiments were carried out in as many early cultures as possible and with the constant experimental system of the cell lines. To subdivide and possibly classify the heterogeneous group of gliomas the following approaches emerged: Immunostaining of cells for glial markers such as GFAP, A4, A2B5, Leu 7 as well as fibronectin will allow one to distinguish different groups of glial cultures. Performance of growth factor sensitivity tests allows the assessment of major aspects of growth control in cultured gliomas. Cytogenetic evaluation in early cultures and correlation with the expression of oncogenes may yield useful information on mechanisms of escape from normal growth control. One of our cell lines (NCE-G28) in which cells switch from GFAP to fibronectin expression and transiently express the x-hapten may serve as a model to study crucial aspects of cellular differentiation. Using different extracellular matrices for the initiation of cultures even from very benign lesions with low proliferative potential it is possible to include these into comparative studies with glioblastomas.