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.
Differentiation and Death of Premyelinating Oligodendrocytes in Developing Rodent Brain
B. Trapp,A. Nishiyama,D. Cheng,W. Macklin
Published 1997 in Journal of Cell Biology
ABSTRACT
PUBLICATION RECORD
- Publication year
1997
- Venue
Journal of Cell Biology
- Publication date
1997-04-21
- Fields of study
Biology, Medicine
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
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