Original Article
Study on the electrophsiological properties in the stria vascularis pericytes in cochlear of guinea pig
Liu Yanhui, Wang Yanping, Wang Yang, Ma Ketao, Si Junqiang, Li Li
Published 2016-08-07
Cite as Chin J Otorhinolaryngol Head Neck Surg, 2016, 51(8): 600-605. DOI: 10.3760/cma.j.issn.1673-0860.2016.08.008
Abstract
ObjectiveThe purpose of this paper was to study the electrophysiological properties and the type of potassium channels on cell membrane in the stria vascularis pericytes in cochlear of guinea pig.
MethodsFirstly examined the expression of the stria vascularis pericytes by desmin, a marker of pericytes, in cochlear of guinea pig with immunofluorescent method. Using whole-cell patch clamp recording techniques to observe electrophysiological properties in the cochlear pericytes in stria vascularis of guinea pig.
ResultsPericytes were predominately distributed in the capillaries of cochlea.The average membrane capacitance, resistance, and potential of a single pericyte in stria vascularis were(5.9±0.3)pF, (2.2±0.3)GΩ and (-30.9±1.2)mV, respectively by using patch clamp technique. In addition, the average current density of cochlear pericyte was voltage-sensitive (Vh from 0 to + 60 mV, in 20 mV steps). The pericytes exhibited outward current and this property could be blocked by TEA (tetraethylammonium) 1 mmol/L, a large-conductance calcium-activated potassium channel(BKCa)inhibitor and 4-AP (4-aminopyridine) 1 mmol/L, a voltage-dependent K+ channels(KV) channel blocker. TEA blocked the outward current from (296.2±35.9)pA to (163.7±16.8)pA and 4-AP blocked the outward current from (248.7±39.8)pA to (158.0±38.0)pA.
ConclusionThese results suggest that pericytes in stria vascularis have BKCa and KV channels.
Key words:
Cochlea; Pericytes; Potassium channels; Patch-clamp techniques; Guinea pigs
Contributor Information
Liu Yanhui
Department of Physiology, the Key Laboratory of Xinjiang Endemic and Ethnic Diseases, Medical College of Shihezi University
Shihezi 832002, China
Wang Yanping
Department of Physiology, the Key Laboratory of Xinjiang Endemic and Ethnic Diseases, Medical College of Shihezi University
Shihezi 832002, China
Wang Yang
Department of Physiology, the Key Laboratory of Xinjiang Endemic and Ethnic Diseases, Medical College of Shihezi University
Shihezi 832002, China
Ma Ketao
Department of Physiology, the Key Laboratory of Xinjiang Endemic and Ethnic Diseases, Medical College of Shihezi University
Shihezi 832002, China
Si Junqiang
Department of Physiology, the Key Laboratory of Xinjiang Endemic and Ethnic Diseases, Medical College of Shihezi University
Shihezi 832002, China
Li Li
Department of Physiology, the Key Laboratory of Xinjiang Endemic and Ethnic Diseases, Medical College of Shihezi University
Shihezi 832002, China