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Derivation of Glial Restricted Precursors from E13 mice
Published on: June 20, 2012
Iron modulates the differentiation of a distinct population of glial precursor cells into oligodendrocytes
1Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah 84112, USA.
Abstract:
Iron deficiency in children is associated with a number of neural defects including hypomyelination. It has been hypothesized by others that this hypomyelination is due to a failure in myelin production. Other possibilities include failure in the generation of oligodendrocytes from their precursor cells or an interruption in oligodendrocyte maturation. These hypotheses are based on the observations that there is a peak in brain iron uptake in vivo that coincides with the period of greatest myelination and that a shortage of iron leads to myelination deficiency. We now demonstrate that iron availability modulates the generation of oligodendrocytes from tripotential-glial restricted precursor (GRP) cells isolated from the embryonic day 13.5 rat spinal cord. In contrast, we found no effects of iron on oligodendrocyte maturation or survival in vitro, nor did we find that increasing iron availability above basal levels increases oligodendrocyte generation from bipotential oligodendrocyte-type-2 astrocyte/oligodendrocyte precursor cells (O-2A/OPCs). Our results raise the possibility that iron may affect oligodendrocyte development at stages during early embryogenesis rather than during later development.
Insights
Iron deficiency in children impairs neural development. This study shows iron availability specifically affects oligodendrocyte generation from precursor cells during early development, impacting myelination.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Iron deficiency in children is linked to neural defects, particularly hypomyelination.
- Hypomyelination may result from impaired myelin production, oligodendrocyte generation, or maturation.
- Peak brain iron uptake coincides with peak myelination, suggesting a critical role for iron.
Purpose of the Study:
- To investigate the role of iron availability in oligodendrocyte development.
- To determine if iron affects oligodendrocyte generation, maturation, or survival in vitro.
- To identify the specific developmental stage at which iron influences oligodendrocyte development.
Main Methods:
- Isolation of tripotential glial restricted precursor (GRP) cells from embryonic rat spinal cord.
- Culture of GRP cells under varying iron availability conditions.
- Assessment of oligodendrocyte generation, maturation, and survival in vitro.
Main Results:
- Iron availability significantly modulates the generation of oligodendrocytes from GRP cells.
- No significant effect of iron on oligodendrocyte maturation or survival was observed.
- Iron did not enhance oligodendrocyte generation from O-2A/OPCs beyond basal levels.
Conclusions:
- Iron influences oligodendrocyte development primarily during the generation phase from precursor cells.
- The critical window for iron's effect appears to be early embryogenesis, not later development.
- These findings suggest a specific mechanism by which iron deficiency leads to hypomyelination.
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