Related Experiment Videos
Adaptation-induced changes in sensitivity in frog olfactory receptor cells.
1Physiological Laboratory, University of Cambridge, Downing Street, Cambridge CB2 3EG, UK. jr10022@hermes.cam.ac.uk
Chemical Senses
|August 17, 2000
Summary
Frog olfactory receptor cells show concentration-dependent responses to cineole odorant. Adaptation significantly reduces sensitivity to odorants, impacting both action potential firing and receptor currents.
Area of Science:
- Olfactory neuroscience
- Sensory physiology
- Cellular biology
Background:
- Olfactory receptor cells (ORCs) are crucial for detecting airborne chemicals.
- Understanding ORC response dynamics to odorants is key to olfactory processing.
- Adaptation mechanisms in ORCs influence sensory perception.
Purpose of the Study:
- To investigate odorant-induced action potential and receptor current responses in frog ORCs.
- To characterize the dose-response relationship of cineole on ORCs.
- To examine the impact of adaptation on ORC sensitivity.
Main Methods:
- Suction pipette technique applied to frog olfactory receptor cells.
- Stimulation with cineole odorant at varying concentrations.
- Application of adapting pre-pulses followed by test pulses.
Main Results:
- Action potential firing frequency saturated with increasing cineole concentration.
- Receptor current response showed no saturation over a wide concentration range.
- Adaptation progressively shifted dose-response curves, reducing sensitivity, especially for action potentials.
Conclusions:
- Frog ORCs exhibit differential saturation properties for action potentials versus receptor currents.
- Adaptation significantly impairs olfactory receptor cell sensitivity to odorants.
- Adaptation differentially affects spiking and current responses, impacting overall olfactory detection.