Abstract
A permanent glial cell line has been established from the neonatal mouse primary mixed glial cell cultures by transfection with replication origin-defective simian virus 40 DNA. This cell line, designated OS3, has morphological similarity to type-2 astrocyte and expresses an astrocyte-specific marker, glial fibrillary acidic protein (GFAP), when cultured in the presence of 10% calf serum (CS). OS3 cells do not express the O4 antigen, galactocerebroside (GalC) and A2B5 under this culture condition. When cultured in a medium containing 2% CS or a chemically defined medium, these cells undergo morphological transformation. Someof these cells express O4 antigen and/or GalC, and the percentage of GFAP positive cells decreases under these conditions. Thus depending on the culture conditions, the OS3 cells display either type-2 astrocyte properties or immature oligodendrocyte characteristics. Furthermore, the OS3 cells show similar responses to the various growth factors as do oligodendrocyte/type-2 astrocyte (O-2A) progenitors. Therefore, the OS3 cell line is an unique mouse bipotential permanent O-2A lineage cell line which may be useful to analyze the developmental properties of these glial cells.
