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Development, Vol 105, Issue 2 387-400, Copyright © 1989 by Company of Biologists
JOURNAL ARTICLES |
G Wolswijk and M Noble
Ludwig Institute for Cancer Research, London, UK.
We have found that glial progenitor cells isolated from the optic nerves of adult rats are fundamentally different from their counterparts in perinatal animals. In our studies on bipotential oligodendrocyte-type-2 astrocyte (O-2A) progenitor cells, we have seen that O-2Aadult progenitor cells can be distinguished from O-2Aperinatal progenitors by their morphology and antigenic phenotype, their much longer cell cycle time (65 h versus 18 h), slower rate of migration rate (4 microns h-1 versus 21 microns h-1), and their time course of differentiation into oligodendrocytes or type-2 astrocytes in vitro (less than or equal to 3 days versus greater than 5 days). At least some of the differences between O-2Aadult and O-2Aperinatal progenitor cells appear to be clearly related to the differing cellular requirements of the adult and perinatal central nervous system (CNS). The properties of the O-2Aadult progenitor cells may make these cells ideally suited for the needs of the adult CNS, where rapid exponential increases in the number of oligodendrocytes and O-2A progenitor cells would be inappropriate. However, the properties of the O-2Aadult progenitor cells are such that they may not be able to replace oligodendrocytes in sufficient numbers to repair extensive or recurrent damage in the adult brain, such as in patients suffering from the human demyelinating disease multiple sclerosis. Moreover, available information about other tissues suggests that the transition from perinatal to adult progenitor cell types may represent a developmental mechanism of general importance.
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