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Chem. Senses 26: 25-34, 2001
© Oxford University Press 2001

Odorant-induced Hyperpolarization and Suppression of cAMP-activated Current in Newt Olfactory Receptor Neurons

Hiroshi Yamada and Kei Nakatani

Institute of Biological Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan

Correspondence to be sent to: Kei Nakatani, Institute of Biological Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan. e-mail: nakatani{at}biol.tsukuba.ac.jp

Although many studies have reported that odorants can elicit inhibitory responses as well as excitatory responses in vertebrate olfactory receptor neurons, the cellular mechanisms that underlie this inhibition are unclear. Here we examine the inhibitory effect of odorants on newt olfactory receptor neurons using whole cell patch clamp recording. At high concentrations, odorant stimulation decreased the membrane conductance and inhibited depolarization. Various odorants (anisole, isoamyl acetate, cineole, limonene and isovaleric acid) suppressed the depolarizing current in a dose-dependent manner. Furthermore, one odorant could suppress the depolarization caused by another odorant. The depolarization caused by isoamyl acetate was inhibited by anisole in cells that were excited by isoamyl acetate but not by anisole. Odorants were able to hyperpolarize cells that were depolarized by cAMP-induced conductance. Given that this inhibitory effect of odorants can affect excitation caused by other odorants, we suggest that it might play a role in coding odorants in olfactory receptor neurons.


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[Abstract] [Full Text] [PDF]


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