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Neuronal differentiation involves both morphological and electrophysiological changes, which depend on calcium influx. Voltage-gated calcium channels (VGCCs) represent a major route for calcium entry into neurons. The recently cloned low-voltage-activated T-type calcium channels (T-channels) are the first class of VGCCs functionally expressed in most developing neurons, as well as in neuroblastoma cell lines, but their roles in neuronal development are yet unknown. Here, we document the part played by T-channels in neuronal differentiation. Using NG108–15, a cell line that recapitulates early steps of neuronal differentiation, we demonstrate that blocking T-currents by nickel, mibefradil, or the endogenous cannabinoid anandamide prevents neuritogenesis without affecting neurite outgrowth. Similar results were obtained using antisense oligodeoxynucleotides directed against the α1H T-channel subunit. Furthermore, we describe that inhibition of α1H T-channel activity impairs concomitantly, but independently, both high-voltage-activated calcium channel expression and neuritogenesis, providing strong evidence for a dual role of T-channels in both morphological and electrical changes at early stages of neuronal differentiation.

Neuronal T-type α1H Calcium Channels Induce Neuritogenesis and Expression of High-Voltage-Activated Calcium Channels in the NG108–15 Cell Line