scholarly journals ‘Nonblocking’ a.c. preamplifier for tip recording from insect taste hairs

1977 ◽  
Vol 15 (4) ◽  
pp. 470-471 ◽  
Author(s):  
F. W. Maes
Keyword(s):  
Taste Hairs

Substance P Immunoreactive Nerve Fibers of the Canine Laryngeal Mucosa

1987 ◽  
Vol 97 (1) ◽  
pp. 39-46 ◽  
Author(s):  
Takemoto Shin ◽  
Shigeru Wada ◽  
Tadatsugu Maeyama ◽  
Shun Watanabe
Keyword(s):  
Substance P ◽  
Light And Electron Microscopy ◽  
Lower Surface ◽  
Nerve Fibers ◽  
Taste Bud ◽  
Nerve Endings ◽  
Free Nerve Endings ◽  
Laryngeal Mucosa ◽  
Glandular Cells ◽  
Taste Hairs

Substance P (SP) immunoreactive nerve endings in the laryngeal mucosa were studied by PAP immunohistochemistry with light and electron microscopy. SP immunoreactive sensory endings were observed in the epithelium as intra-epithelial free nerve endings and taste bud-like structures. A small number of autonomic SP immunoreactive nerve fibers were observed running parallel to arterioles which were over 30 μm in diameter and terminated in glandular cells. Contrary to findings by silver impregnation, intraepithelial free nerve endings were more frequently observed on the lower surface of the vocal cord. The taste bud-like structures were classified into two different types: (1) simple terminations and (2) reticular terminations, according to the mode of the SP immunoreactive nerve fiber. Immature or degenerated taste bud-like structures in the larynx were assumed to be mechanical receptors because these receptors lacked outer taste pores and taste hairs.

scholarly journals Expression of the Metabotropic Glutamate Receptor, mGluR4a, in the Taste Hairs of Taste Buds in Rat Gustatory Papillae.

2002 ◽  
Vol 65 (1) ◽  
pp. 91-96 ◽  
Author(s):  
Takashi TOYONO ◽  
Yuji SETA ◽  
Shinji KATAOKA ◽  
Hidemitsu HARADA ◽  
Takahiko MOROTOMI ◽  
...  
Keyword(s):  
Glutamate Receptor ◽  
Metabotropic Glutamate Receptor ◽  
Taste Buds ◽  
Metabotropic Glutamate ◽  
Taste Hairs ◽  
Gustatory Papillae

scholarly journals Transduction Ion Channels Directly Gated by Sugars on the Insect Taste Cell

2000 ◽  
Vol 115 (4) ◽  
pp. 455-466 ◽  
Author(s):  
Midori Murakami ◽  
Hiromasa Kijima
Keyword(s):  
Ion Channels ◽  
G Protein ◽  
Single Channel ◽  
Receptor Cell ◽  
Taste Cell ◽  
Sugar Receptor ◽  
Taste Hairs ◽  
Sensory Processes ◽  
Sensory Process ◽  
Receptor Channel

Insects detect sugars and amino acids by a specialized taste cell, the sugar receptor cell, in the taste hairs located on their labela and tarsi. We patch-clamped sensory processes of taste cells regenerated from the cut end of the taste hairs on the labelum of the flashfly isolated from the pupa ∼20 h before emergence. We recorded both single channel and ensemble currents of novel ion channels located on the distal membrane of the sensory process of the sugar receptor cell. In the stable outside-out patch membrane excised from the sensory processes, we could repeatedly record sucrose-induced currents for tens of minutes without appreciable decrease. An inhibitor of G-protein activation, GDP-β-S, did not significantly decrease the sucrose response. These results strongly suggested that the channel is an ionotropic receptor (a receptor/channel complex), activated directly by sucrose without mediation by second messengers or G protein. The channel was shown to be a nonselective cation channel. Analyses of single channel currents showed that the sucrose-gated channel has a single channel conductance of ∼30 pS and has a very short mean open time of ∼0.23 ms. It is inhibited by external Ca2+ and the dose–current amplitude relation could be described by a Michaelis-Menten curve with an apparent dissociation constant of ∼270 mM. We also report transduction ion channels of the receptor/channel complex type directly gated by fructose and those gated by L-valine located on the sensory process.

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