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Odorant response of isolated olfactory receptor cells is blocked by amiloride

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Summary

Olfactory receptor cells were isolated from the nasal mucosa ofRana esculenta and patch clamped. Best results were obtained with free-floating cells showing ciliary movement. 1)On-cell mode: Current records were obtained for up to 50 min. Under control conditions they showed only occasional action potentials. The odorants cineole, amyl acetate and isobutyl methoxypyrazine were applied in saline by prolonged superfusion. At 500 nanomolar they elicited periodic bursts of current transients arising from cellular action potentials. The response was rapidly, fully and reversibly blocked by 50 μm amiloride added to the odorant solution. With 10 μm amiloride, the response to odorants was only partially abolished. 2)Whole-cell mode: Following breakage of the patch, the odorant response was lost within 5 to 15 min. Prior to this, odorants evoked a series of slow transient depolarizations (0.1/sec, 45 mV peak to peak) which reached threshold and thus elicited the periodic discharge of action potentials. These slow depolarizing waves were reversibly blocked by amiloride, which stabilized the membrane voltage between −80 and −90 mV. We conclude that amiloride inhibits chemosensory transduction of olfactory receptor cells, probably by blocking inward current pathways which open in response to odorants.

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  1. Second Department of Physiology, University of the Saarland, D-6650, Homburg/Saar, West Germany

    Stephan Frings & Bernd Lindemann

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Frings, S., Lindemann, B. Odorant response of isolated olfactory receptor cells is blocked by amiloride. J. Membrain Biol. 105, 233–243 (1988). https://doi.org/10.1007/BF01871000

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