Double-gating mechanism and diversity of an adenosine triphosphate (ATP)-sensitive K(+) channel in neurons acutely dissociated from rat neocortex

Science in China. Series C, Life Sciences
Z Q TongW Yang

Abstract

Classically, ion channels are classified into 2 groups: chemical-sensitive (ligand-gated) and voltage sensitive channels. Single ATP-sensitive K(+) (K-ATP) channel currents were recorded in acutely dissociated rat neocortical neurons using patch clamp technique. A type of K-ATP channel has been found to be gated not only by intracellular ATP, but also by membrane potential (V(m)), and proved to be a novel mechanism underlying the gating of ion channels, namely bi-gating mechanism. The results also show that the K-ATP channels possess heterogeneity and diversity. These types of K-ATP channels have been identified in 40.12% of all patches, which are different in activation-threshold and voltage-sensitivity. The present experiment studied the type-3 K-ATP channel with a unitary conductance of about 80 pS in detail (n = 15). Taking account of all the available data, a variety of K-ATP channels are suggested to exist in body, and one type of them is bi-gated by both chemical substances and membrane potentials. This property of the K-ATP channels may be related to their pathophysiological function.

References

Dec 1, 1992·Pflügers Archiv : European journal of physiology·T Ohno-Shosaku, C Yamamoto
Jan 1, 1991·The Japanese Journal of Physiology·A Noma, M Takano
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May 1, 1986·Journal of Neuroscience Methods·A R Kay, R K Wong
Jun 23, 1995·Neuroscience Letters·M IshimaruJ W Olney

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Citations

Dec 21, 2010·Biochemistry. Biokhimii︠a︡·M S KritskyO A Golub

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