J. Cell Biol.
© The Rockefeller University Press
0021-9525/97/04/459/10 $2.00
Volume 137, Number 2, April 21, 1997 459-468

Differentiation and Death of Premyelinating Oligodendrocytes in Developing Rodent Brain

Bruce D. Trapp, Akiko Nishiyama, David Cheng, and Wendy Macklin

Department of Neurosciences, Research Institute, The Cleveland Clinic Foundation, Cleveland, Ohio 44195

Previous studies have indicated that newly formed oligodendrocytes are dynamic cells whose production, survival, and differentiation depend upon axonal influences. This study has characterized the appearance and fate of newly formed oligodendrocytes in developing rat brain. Oligodendrocytes appear in predictable locations and radially extend DM-20-positive processes that cover 80-µm domains in the cortex and 40-µm domains in the corpus callosum. These premyelinating oligodendrocytes have one of two fates: they myelinate axons or degenerate. Between 7 and 21 d after birth, ~20% of premyelinating oligodendrocytes identified in the cerebral cortex were degenerating. Oligodendrocytes that ensheathed axons expressed and selectively targeted proteolipid protein to compact myelin and did not degenerate. These observations support the hypothesis that axonal influences affect oligodendrocyte survival, differentiation, and expression of proteolipid protein gene products.

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