Abstract
We examined marginal cells in stria vascularis for the presence of amiloride-sensitive Na+ channels, a possible pathway for maintaining a low Na+ concentration in the endolymph. Whole-cell voltage-clamp experiment shows that amiloride at 1 μM concentration reversibly reduces inward current more than outward current. Immunogold-labeling method shows that the luminal and lateral membrane have antigenic sites for these antibodies. These observations indicate the presence of amiloride-sensitive channels in the marginal cell. If amiloride-sensitive channels in the luminal membrane are highly selective to Na+, they could be an efficient pathway for Na+ uptake from the endolymph. In the basolateral membrane, amiloride-sensitive Na+ channels may make a relatively small contribution to the unusual resting potential.
Original language | English (US) |
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Pages (from-to) | 163-166 |
Number of pages | 4 |
Journal | Neuroscience Letters |
Volume | 172 |
Issue number | 1-2 |
DOIs | |
State | Published - May 19 1994 |
Keywords
- Amiloride
- Endolymph
- Sodium channel
- Stria vascularis
ASJC Scopus subject areas
- Neuroscience(all)