Abstract
When immature O-2A (oligodendrocyte-type 2 astrocyte) lineage cells purified from rat mixed cortical glial cultures were subcultured at low density in 10% fetal calf serum (FCS)-containing medium they largely differentiated into type-2 astrocytes. When the same number of cells was subcultured at high density in the same volume of medium the proportion of O-2A progenitors differentiating into oligodendrocytes was substantially increased. The possibility that oligodendrocyte differentiation in high-density cultures is facilitated by autocrine factors is supported by the observation that a medium conditioned by high-density subcultures of purified O-2A cells contains high molecular weight (> 30 kDa), non-mitogenic factor(s) capable of inducing a rapid differentiation of immature 0-2A cells into oligodendrocytes even in low-density cultures.
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