Rapid filopodial sprouting induced by electrical stimulation in nerve terminals

Area of Science:

• Neuroscience
• Cell Biology

Background:

• Neuronal development involves complex cellular processes, including the extension of neurites and the formation of specialized structures.
• Filopodia are dynamic actin-rich protrusions involved in cell migration, adhesion, and sensing the environment.

Purpose of the Study:

• To investigate the effects of direct electrical stimulation on filopodial formation in cultured neuronal and neuroendocrine cells.
• To elucidate the underlying mechanisms and cellular localization of electrically induced filopodial sprouting.

Main Methods:

• Utilized cultured chromaffin cells and neuronally differentiated PC12 cells.
• Applied direct electrical stimulation to neurite terminals.
• Assessed filopodial formation and its dependence on calcium and cytoskeletal components.

Main Results:

• Direct electrical stimulation induced rapid filopodial sprouting at neurite terminals in a calcium-dependent manner.
• Repetitive stimulation facilitated filopodia formation.
• Cytoskeletal blocking agents did not significantly inhibit filopodial sprouting, suggesting a distinct mechanism.

Conclusions:

• Electrical stimulation is a potent trigger for filopodial sprouting in neuronal and neuroendocrine cells.
• The calcium-dependent, localized nature of this response suggests a role in dynamic processes like neuronal growth cone navigation and development.