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Neuron. 2017 Nov 15;96(4):856-870.e4. doi: 10.1016/j.neuron.2017.10.014.

Double-Nanodomain Coupling of Calcium Channels, Ryanodine Receptors, and BK Channels Controls the Generation of Burst Firing.

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Oregon Hearing Research Center, Oregon Health & Science University, Portland, OR 97239, USA; Division of Pharmacology, National Institute of Health Sciences, Kanagawa 210-9501, Japan. Electronic address:
Oregon Hearing Research Center, Oregon Health & Science University, Portland, OR 97239, USA; Vollum Institute, Oregon Health & Science University, Portland, OR 97239, USA. Electronic address:


Action potentials clustered into high-frequency bursts play distinct roles in neural computations. However, little is known about ionic currents that control the duration and probability of these bursts. We found that, in cartwheel inhibitory interneurons of the dorsal cochlear nucleus, the likelihood of bursts and the interval between their spikelets were controlled by Ca2+ acting across two nanodomains, one between plasma membrane P/Q Ca2+ channels and endoplasmic reticulum (ER) ryanodine receptors and another between ryanodine receptors and large-conductance, voltage- and Ca2+-activated K+ (BK) channels. Each spike triggered Ca2+-induced Ca2+ release (CICR) from the ER immediately beneath somatic, but not axonal or dendritic, plasma membrane. Moreover, immunolabeling demonstrated close apposition of ryanodine receptors and BK channels. Double-nanodomain coupling between somatic plasma membrane and hypolemmal ER cisterns provides a unique mechanism for rapid control of action potentials on the millisecond timescale.


auditory; calcium channel; endoplasmic reticulum; potassium channel; ryanodine

[Available on 2018-11-15]
[Indexed for MEDLINE]

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