Calcium waves propagate through radial glial cells and modulate proliferation in the developing neocortex

Area of Science:

• Neuroscience
• Developmental Biology
• Cell Biology

Background:

• The adult neocortex develops from embryonic neuronal progenitor cells.
• Radial glial cells are transient embryonic cells crucial for neuronal migration and are now recognized as key neuronal progenitors.
• Understanding radial glial cell communication is vital for comprehending cortical development and architecture.

Purpose of the Study:

• To investigate intercellular signaling mechanisms among radial glial cells in the embryonic neocortex.
• To determine if radial glial cells utilize calcium signaling for communication.
• To explore the role of radial glial calcium signaling in regulating neurogenesis.

Main Methods:

• Utilized calcium imaging techniques to visualize calcium wave propagation in radial glial cells within the ventricular zone (VZ) of the embryonic cortex.
• Investigated the molecular components required for calcium wave initiation and propagation, including connexin hemichannels and P2Y1 ATP receptors.
• Assessed the impact of disrupting radial glial calcium waves on VZ proliferation during peak embryonic neurogenesis.

Main Results:

• Demonstrated spontaneous propagation of calcium waves through radial glial cells in the VZ.
• Identified connexin hemichannels, P2Y1 ATP receptors, and intracellular IP3-mediated calcium release as necessary for these calcium waves.
• Showed that disruption of these calcium waves led to a decrease in VZ proliferation during embryonic neurogenesis.

Conclusions:

• Radial glial cells exhibit intercellular calcium signaling via propagating waves.
• This calcium signaling mechanism, dependent on specific molecular players, plays a regulatory role in cortical neuronal production.
• These findings reveal a novel signaling pathway in radial glia that influences the development of the neocortex.