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Quantal-like current fluctuations induced by odorants in olfactory receptor cells
A Menini1, C Picco, S Firestein
1Istituto di Cibernetica e Biofisica, Consiglio Nazionale delle Ricerche, Genova, Italy.
Nature
|February 2, 1995
Summary
Researchers found evidence of single odorant molecule detection in vertebrate olfactory receptor cells. This suggests a quantal event, potentially a single molecule binding, triggers a measurable current fluctuation, advancing olfactory science.
Area of Science:
- Olfactory neuroscience
- Sensory biology
- Molecular mechanisms of olfaction
Background:
- Sensory systems, like vision and hearing, exhibit high sensitivity, detecting single photons or atomic displacements.
- While insects can detect single pheromone molecules, quantal responses in vertebrate olfactory receptor cells remain unconfirmed.
- Human olfactory detection suggests a low threshold, possibly involving single odorant molecule activation per receptor.
Purpose of the Study:
- To investigate the potential for single odorant molecule detection in vertebrate olfactory systems.
- To identify and characterize quantal events in olfactory receptor cells upon odorant stimulation.
Main Methods:
- Measurement of current fluctuations in olfactory receptor cells.
- Application of odorants to induce cellular responses.
- Analysis of electrical signals to identify discrete events.
Main Results:
- Observed current fluctuations in the range of 0.3-1 pA.
- These fluctuations are consistent with a quantal event.
- The quantal event is presumed to be initiated by the binding of a single odorant molecule.
Conclusions:
- Vertebrate olfactory receptor cells may respond to single odorant molecules.
- A single odorant molecule binding event can trigger a measurable quantal current.
- This finding provides direct evidence for the molecular basis of olfactory detection sensitivity.