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A Novel Type of Calcium Channel Sensitive to omega-agatoxin-TK in Cultured Rat Cerebral Cortical Neurons

A Novel Type of Calcium Channel Sensitive to omega-agatoxin-TK in Cultured Rat Cerebral Cortical Neurons

T Teramoto, T Niidome, M Kimura, M Ohgoh, Y Nishizawa, K Katayama, T Mayumi, K Sawada

Brain Res. 1997 May 9;756(1-2):225-30.

PMID: 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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP158484425	ω-Agatoxin TK		158484-42-5	Price

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