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Morphology of dissociated hippocampal cultures from fetal mice
Abstract:
Dissociated hippocampal cultures from fetal mice (13--18 days gestational age) can be maintained for up to two months in culture. Cells grow as either isolated neurons or in small neuronal aggregates. Neurons remain small with a soma diameter of 15--20 micrometer even in mature cultures and develop extensively branched processes during the first two weeks in culture. After this time, processes become more difficult to visualize with phase-contrast optics because of a tendency to grow within the underlying non-neuronal cells. However, the presence of processes has been proved by silver-staining which demonstrates an organizational complexity ranging from a loosely reticulated neuropil to fascicles containing many fibers. More detailed study of individual neuronal morphology was carried out in cells filled with the fluorescent dye, Lucifer Yellow CH, in conjunction with the intracellular recording of synaptic and action potentials from dye-containing micropipettes. Dye-filled cells show a well-developed branching morphology. Process specializations include spines, beading, and basket-like endings. Processes tend to emanate from one side of the soma, either originating at the cell body or from a single trunk. Commonly there are 2--4 orders of branching, but up to 6 orders can occur (counted centrifugally from the soma). Electron microscopy revealed synapses distributed predominantly on dendrites with a smaller number on somata. Dendritic spines are present and are contacted principally by asymmetric synaptic junctions. Symmetric synapses are relatively more common on somata and proximal dendrites.
Insights
Dissociated hippocampal cultures from fetal mice provide a model for studying neuronal development. These cultures reveal complex neuronal morphology, including branching processes and synaptic connections, crucial for understanding brain function.
Area of Science:
- Neuroscience
- Cell Biology
- Developmental Biology
Background:
- Dissociated hippocampal cultures are established from fetal mice (13-18 days gestational age).
- These cultures can be maintained for up to two months, supporting neuronal growth and differentiation.
- Neurons in culture exhibit distinct morphological characteristics and develop complex processes over time.
Purpose of the Study:
- To characterize the morphology and synaptic organization of dissociated mouse hippocampal neurons in culture.
- To investigate neuronal development and process formation in vitro.
- To utilize advanced imaging and electrophysiological techniques for detailed neuronal analysis.
Main Methods:
- Maintenance of dissociated hippocampal cultures from fetal mice.
- Phase-contrast microscopy and silver-staining for visualizing neuronal processes.
- Lucifer Yellow CH dye-filling combined with intracellular recording for detailed morphology and electrophysiology.
- Electron microscopy to examine synaptic structures.
Main Results:
- Neurons exhibit extensive branching, with specialized structures like spines and beading.
- Processes predominantly originate from one side of the soma, with branching orders up to six.
- Synapses are primarily located on dendrites, with asymmetric junctions on spines.
- Symmetric synapses are more prevalent on somata and proximal dendrites.
Conclusions:
- Dissociated hippocampal cultures serve as a valuable model for studying neuronal morphology and synaptogenesis.
- The study elucidates the intricate structural organization of developing hippocampal neurons in vitro.
- Findings contribute to understanding the cellular basis of hippocampal function and development.