Membrane Excitability of Wing and Rod Cells in Frog Taste Discs Following Denervation.
From: Department of Oral Physiology, School of Dentistry, Iwate Medical University, Morioka 020-8505, Japan.
Brain research
- Publish Date: Aug 2006
- ISSN: 0006-8993
- Volume: 1103
- Issue: 1
- Pages: 145-9
- Medium: Print
- Language: English
- Citation (JAMA): Okuda-Akabane Kazuhisa, Fukami Hideyuki, Narita Kinya, et al. Membrane Excitability of Wing and Rod Cells in Frog Taste Discs Following Denervation.. Brain Res. Aug 2006;1103:145-9
Abstract
The frog tongue has a disc-shaped taste organ (taste disc) on the top of fungiform papillae. The taste disc contains two types of cells, wing cells with a sheet-like apical process and rod cells with a rod-like apical process. Both wing and rod cells can produce action potentials. Unlike the taste buds of mammals, frog taste discs do not degenerate over a long period after denervation. Here we report that the shapes of wing and rod cells isolated from taste discs in the bullfrog (Rana catesbeiana) remained unchanged 1 month after cutting bilateral glossopharyngeal nerves. By applying the whole cell patch-clamp technique to isolated wing and rod cells, we found voltage-dependent inward currents and outward currents and action potentials in denervated frogs as seen in normal frogs. These results suggest that the maintenance of morphological integrity and electrical excitability of taste cells does not require a nerve supply in frogs.
Mesh Headings (Keywords): Action Potentials, Animals, Cell Membrane, Cell Separation, Cell Shape, Denervation, Electric Stimulation, Glossopharyngeal Nerve, Ion Channel Gating, Membrane Potentials, Neurons, Afferent, Patch-Clamp Techniques, Potassium, Rana catesbeiana, Sodium Channels, Taste, Tongue
Check for Full Text / PubMed Unique Identifier (PMID): 16787642
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