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Temporospatial relationships between macroglia and microglia during in vitro differentiation of murine stem cells
D N Angelov1, S Arnhold, C Andressen
1Institut für Anatomie der Universität zu Köln, Deutschland, Germany. angelov.anatomie@uni-koeln.de
Abstract:
Embryonic stem (ES) cells of the permanent line BLC6 derived from a 129/Sv Gat mouse blastocyst were differentiated as spheroid aggregates (embryoid bodies, EBs) in the presence of retionic acid. After 2 days in suspension, EBs were plated on gelatine-coated glass coverslips and cultivated for 5, 9, and 16 days post plating (DPP) in normal medium. In this study we investigated whether the well-known retinoic acid-induced differentiation of ES cells into neurons (identified by immunostaining for neuron-specific enolase and synaptophysin) was accompanied by cells expressing astroglial (GFAP), oligodendroglial (O4), and microglial (5C6, galectin-3) markers. Whereas differentiation of neurons was closely related to their centrifugal migration towards the periphery of the EBs, the maturation of neuroglia followed a strict time-dependent manner. At 5 DPP, only neurons but no cells expressing glia-specific markers, were observed. At 9 DPP, GFAP-positive and O4-positive macroglial cells appeared. At 16 DPP, microglial cells (5C6-positive and galectin-3-positive) occurred. The established dynamic of relationships between neuronal and nonneuronal cells shows that the model of EBs is similar to the sequence differentiation of the nervous tissue. Thus, enabling in vivo observation of neurons, astrocytes, oligodendrocytes, and microglia, the model of EBs provides a basis for further investigations on the relationships between neurons and neuroglia under various experimental conditions.
Insights
Embryonic stem cells differentiated into neurons and neuroglia in embryoid bodies. This model mimics nervous system development, showing distinct timelines for neuronal and glial cell maturation.
Area of Science:
- Developmental Biology
- Neuroscience
- Stem Cell Research
Background:
- Embryonic stem (ES) cells offer a model for studying cell differentiation.
- Retinoic acid is known to induce neuronal differentiation in ES cells.
- Understanding neuroglial development is crucial for neuroscience.
Purpose of the Study:
- To investigate the differentiation timeline of neurons and neuroglia from ES cells using embryoid bodies (EBs).
- To determine if retinoic acid-induced neuronal differentiation is accompanied by the emergence of astroglial, oligodendroglial, and microglial cells.
- To establish a dynamic model for studying neuron-neuroglia interactions.
Main Methods:
- Mouse ES cells (BLC6 line) were aggregated into embryoid bodies (EBs) and treated with retinoic acid.
- EBs were cultured for 5, 9, and 16 days post plating (DPP).
- Immunostaining was used to identify neurons (NSE, synaptophysin) and glial cells (GFAP, O4, 5C6, galectin-3).
Main Results:
- Neuronal differentiation correlated with centrifugal migration in EBs.
- No glial markers were detected at 5 DPP; neurons were present.
- Macroglial cells (GFAP+, O4+) appeared at 9 DPP, and microglial cells (5C6+, galectin-3+) emerged at 16 DPP.
Conclusions:
- Embryoid body differentiation recapitulates the temporal sequence of nervous tissue development.
- This EB model allows for in vivo observation of neuronal and glial cell interactions.
- The model provides a foundation for further research into neuron-neuroglia relationships under experimental conditions.