This article describes the process of culturing mouse embryonic dorsal root ganglion (DRG) neurons and their interaction with Schwann cells. The methodology highlights the importance of ascorbic acid in promoting myelination and neuronal communication.
Begin with a multi-well plate containing a coverslip coated with poly-D-lysine and a neuron growth medium.
Place the mouse embryonic dorsal root ganglion, or DRG, rich in sensory neurons, into this well and incubate.
DRG neurons utilize the nutrients and growth factors that facilitate their growth, followed by the extension of neuronal projections, forming axons.
These axons grow out from DRG tissue, establishing the DRG explant culture.
Replace the medium with an ascorbic acid-supplemented co-culture medium with Schwann cells, a specialized glial cell.
Over time, axons secrete signaling molecules that trigger Schwann cell migration toward the axons.
Meanwhile, the ascorbic acid stimulates various signaling pathways in the Schwann cells.
These activated cells begin to extend their lipid-rich plasma membranes around the axons, wrapping them in multiple layers to form the myelin sheath.
This myelination results in an insulating covering around the axons, which is essential for efficient neuronal communication.
Take a four-well plate containing 190 microliters of DRG growth medium in each well, and carefully transfer a single DRG into the center of each well using fine forceps and a spatula. Then, place the DRG explant cultures in the incubator at 37 degrees Celsius and 5% carbon dioxide. The next day, carefully add 50 microliters of the DRG growth medium to each well, and observe DRG explant adherence and axon outgrowth using a microscope daily. For co-culturing on day three of the DRG explant culture, carefully replaced the DRG growth medium with 250 microliters of the co-culture medium containing 30,000 Schwann cells per well.
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