Visualization and Live Imaging of Oligodendrocyte Organelles in Organotypic Brain Slices Using Adeno-associated Virus and Confocal Microscopy
October 23rd, 2017
Myelinating oligodendrocytes promote rapid action potential propagation and neuronal survival. Described here is a protocol for oligodendrocyte-specific expression of fluorescent proteins in organotypic brain slices with subsequent time-lapse imaging. Further, a simple procedure for visualizing unstained myelin is presented.
The overall goal of this viral transduction and time-lapse recording is to visualize movement of oligodendrocyte mitochondria in organotypic brain slices.This method can help answer key questions in the oligodendrocyte field.Such as how the oligodendrocytes and their organelles respond to changes in the local environment.The main advantage of this technique is that it gives detailed information about oligodendrocyte structure and organelle dynamics in a preparation where all the different brain cells are present and oligodendrocytes produce compact myelin.Transduce oligodendrocytes in slice cultures at day seven in vitro.First draw up 1.3 microliters of diluted AAV per slice.Making sure the outside of the pipette tip is dry, hold pipette above the cortex as close as possible without touching the slice with the pipette tip and slowly push solution out of the pipette.When the solution touches the slice, move the pipette tip over the cortex to spread the solution over the whole cortex area.Once all the slices in one dish have been transduced, return the dish to the incubator and then repeat the process on the other dishes.Examine the slices for expression of fluorescent markers and image the slices when the expression levels of the fluorescent markers are sufficient and the slices look healthy.Begin setting up the imaging bath by using modeling clay to attach syringe needles bent at a 45
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Overview
This study focuses on the dynamics of oligodendrocytes through a protocol for oligodendrocyte-specific expression of fluorescent proteins in organotypic brain slices. By employing time-lapse imaging, researchers aim to visualize the movement of oligodendrocyte mitochondria and understand their response to environmental changes.
Key Study Components
Area of Science
- Neuroscience
- Cell Biology
- Imaging Techniques
Background
- Myelinating oligodendrocytes are crucial for efficient neuronal signaling.
- They enhance action potential propagation and support neuronal survival.
- Understanding oligodendrocyte behavior can provide insights into brain function and pathology.
Purpose of Study
- To visualize oligodendrocyte mitochondria movement in an organotypic brain slice model.
- To investigate how oligodendrocytes respond to local environmental changes.
- To provide a method that aids in assessing oligodendrocyte structure and dynamics.
Methods Used
- The experiment utilizes organotypic brain slices for observing oligodendrocyte behavior.
- Oligodendrocytes are transduced at day seven in vitro using a viral vector.
- The time-lapse imaging method captures the dynamic changes of oligodendrocytes.
- Careful pipetting techniques are employed to ensure uniform transduction across slices.
Main Results
- The approach enables detailed observation of oligodendrocyte movement and mitochondrial dynamics.
- Insights into the structural responses of oligodendrocytes are expected to emerge from the imaging data.
Conclusions
- This protocol facilitates the visualization of oligodendrocyte dynamics in a relevant model.
- The findings could enhance understanding of oligodendrocyte functions and their implications for neuronal health.
