Abstract
A single bipotential glial progenitor cell of newborn rat optic nerve (the O-2A progenitor) characterized by its reactivity with antibodies to surface gangliosides (A2B5) and the presence of vimentin, can grow in microcultures in conditions which favor this progenitor's differentiation into oligodendrocytes. We selected at 8 days larger clones derived from such bipolar progenitors which had steadily proliferated on a layer of Type-1 astrocytes during the first week. Clonal growth and ratio of progenitor cells to oligodendrocytes was measured over the next two weeks by phase microscopy and double immunofluorescence labeling for the specific markers A2B5, GC (galactocerebroside, a surface marker for differentiated oligodendrocytes), O4 (a glycolipid marker of oligodendrocytes and some progenitors), GFAP (an astrocyte specific intermediate filament protein) and vimentin. Two types of clones were identified: type A clones (the majority), which were still slowly expanding at three weeks, and type B clones (the minority), which had stopped proliferating during the second week. In type A clones, some cells became GC positive multipolar oligodendrocytes, while other multipolar cells remained GC negative for days and expressed A2B5 and O4, but not GFAP or vimentin. Type B clones contained only GC positive, vimentin negative oligodendrocytes, which were generated during the second week and then decreased in number because of their restricted lifespan. Type B clones only developed in the presence of insulin or neurons. The number of GC negative cells in type A clones increased when insulin or neurons were deleted.(ABSTRACT TRUNCATED AT 250 WORDS)
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