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  • Title: A novel type of calcium channel sensitive to omega-agatoxin-TK in cultured rat cerebral cortical neurons.
    Author: Teramoto T, Niidome T, Kimura M, Ohgoh M, Nishizawa Y, Katayama K, Mayumi T, Sawada K.
    Journal: Brain Res; 1997 May 09; 756(1-2):225-30. PubMed ID: 9187336.
    Abstract:
    We characterized the electrophysiological properties of calcium channels in cultured rat cerebral cortical neurons using omega-agatoxin-TK (omega-Aga-TK) by a patch-clamp technique. Two types of slowly inactivating calcium channels sensitive to omega-Aga-TK were detected. The first type showed high sensitivity to omega-Aga-TK and low recovery from the omega-Aga-TK-induced blockade during washout, corresponding to the P-type channel. The second type showed low sensitivity to omega-Aga-TK and high recovery, resembling the Q-type channel, although it was distinct from the Q-type in terms of slower inactivation kinetics. We designate this channel as Q(L)-type (long-lasting Q channel). The omega-Aga-TK-sensitive calcium channels involved in the glutamatergic synaptic transmission were also divided into two types based on the sensitivity to omega-Aga-TK and reversibility of omega-Aga-TK-induced blockade. We conclude that the Q(L)-type is a novel type of channel, and that both P-type and Q(L)-type channels play a significant role in the cerebral cortical synaptic transmission.
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