Chem. Senses 27: 367-374,
2002
© Oxford University Press 2002
Slow Potentials in Taste Cells Induced by Frog Glossopharyngeal Nerve Stimulation
Department of Physiology, Nagasaki University School of Dentistry, 1-7-1 Sakamoto, Nagasaki 852-8588, Japan
Correspondence to be sent to: Toshihide Sato, Department of Physiology, Nagasaki University School of Dentistry, 1-7-1 Sakamoto, Nagasaki 852-8588, Japan. e-mail: toshi{at}net.nagasaki-u.ac.jp
Intracellular recordings were made from the taste cells of atropinized
bullfrogs while the glossopharyngeal (GP) nerve fibres were electrically
stimulated. Two types of slow potential, slow hyperpolarizing potentials (HPs)
and slow depolarizing potentials (DPs), were induced in the taste cells. The
slow HPs appeared when the lingual capillary blood flow was kept above 0.7
mm/s, whereas the slow DPs appeared when the blood flow was slowed down below
0.7 mm/s. The membrane resistance of a taste cell increased during the
generation of a slow HP, but decreased during the generation of a slow DP. The
reversal potentials for the slow HPs and the slow DPs were recorded at the
same membrane potential (-11 to 
-13 mV). Activation of non-selective
cation channels possibly induced the slow DP and inactivation of those
channels possibly induced the slow HP in the taste cell membrane. Electrical
stimulation of the GP nerve activated a population of C fibres in the nerve
and possibly released neurotransmitters from the nerve terminals. Released
neurotransmitters might cause modulation of the membrane conductance in taste
cells that leads to generation of the slow potentials. The present data
suggest that slow HPs and slow DPs evoked in the taste cells of atropinized
frogs by GP nerve stimulation are induced by putative neurotransmitters in the
taste disc.
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