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논문 기본 정보

자료유형
학술저널
저자정보
Sharma Kushal (College of Pharmacy and Natural Medicine Research Institute Mokpo National University Mokpo 58554 K) 강권우 (목포대학교) Seo Young-Woo (KBSI Gwangju Center Korea Basic Science Institute Gwangju 61186 Korea) Glowatzki Elisabeth (Department of Otolaryngology-Head and Neck Surgery and Neuroscience The Johns Hopkins School of Med) 이은영 (College of Pharmacy and Natural Medicine Research Institute Mokpo National University Mokpo 58554 K)
저널정보
한국뇌신경과학회 Experimental Neurobiology Experimental Neurobiology Vol.31 No.4
발행연도
2022.8
수록면
243 - 259 (17page)
DOI
10.5607/en22013

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Cochlear afferent nerve fibers (ANF) are the first neurons in the ascending auditory pathway. We investigated the low-voltage activating K+ channels expressed in ANF dendrites using isolated rat cochlear segments. Whole cell patch clamp recordings were made from the dendritic terminals of ANFs. Outward currents activating at membrane potentials as low as -64 mV were observed in all dendrites studied. These currents were inhibited by 4-aminopyridine (4-AP), a blocker known to preferentially inhibit low-voltage activating K+ currents (IKL) in CNS auditory neurons and spiral ganglion neurons. When the dendritic IKL was blocked by 4-AP, the EPSP decay time was significantly prolonged, suggesting that dendritic IKL speeds up the decay of EPSPs and likely modulates action potentials of ANFs. To reveal molecular subtype of dendritic IKL, α-dendrotoxin (α-DTX), a selective inhibitor for Kv1.1, Kv1.2, and Kv1.6 containing channels, was tested. α-DTX inhibited 23±9% of dendritic IKL. To identify the α-DTXsensitive and α-DTX-insensitive components of IKL, immunofluorescence labeling was performed. Strong Kv1.1- and Kv1.2-immunoreactivity was found at unmyelinated dendritic segments, nodes of Ranvier, and cell bodies of most ANFs. A small fraction of ANF dendrites showed Kv7.2- immunoreactivity. These data suggest that dendritic IKL is conducted through Kv1.1and Kv1.2 channels, with a minor contribution from Kv7.2 and other as yet unidentified channels.

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