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The Journal of Neuroscience, March 11, 2009, 29(10):3067-3072; doi:10.1523/JNEUROSCI.6187-08.2009

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Brief Communications
Peripheral Adaptation Codes for High Odor Concentration in Glomeruli

Jérôme Lecoq,^1,2,3 * Pascale Tiret,^1,2,3 * and Serge Charpak^1,2,3

¹Institut National de la Santé et de la Recherche Médicale, U603, ²Centre National de la Recherche Scientifique, UMR 8154, and ³Laboratory of Neurophysiology and New Microscopies, Université Paris Descartes, 75006 Paris, France

Correspondence should be addressed to Serge Charpak, Institut National de la Santé et de la Recherche Médicale, U603, Laboratory of Neurophysiology, 45 rue des St Pères, 75006 Paris, France. Email: serge.charpak{at}parisdescartes.fr

Adaptation is a general property of sensory receptor neurons and has been extensively studied in isolated cell preparation of olfactory receptor neurons. In contrast, little is known about the conditions under which peripheral adaptation occurs in the CNS during odorant stimulation. Here, we used two-photon laser-scanning microscopy and targeted extracellular recording in freely breathing anesthetized rats to investigate the correlate of peripheral adaptation at the first synapse of the olfactory pathway in olfactory bulb glomeruli. We find that during sustained stimulation at high concentration, odorants can evoke local field potential (LFP) postsynaptic responses that rapidly adapt with time, some within two inhalations. Simultaneous measurements of LFP and calcium influx at olfactory receptor neuron terminals reveal that postsynaptic adaptation is associated with a decrease in odorant-evoked calcium response, suggesting that it results from a decrease in glutamate release. This glomerular adaptation was concentration-dependent and did not change the glomerular input–output curve. In addition, in situ application of antagonists of either ionotropic glutamate receptors or metabotropic GABA_B receptors did not affect this adaptation, thus discarding the involvement of local presynaptic inhibition. Glomerular adaptation, therefore, reflects the response decline of olfactory receptor neurons to sustained odorant. We postulate that peripheral fast adaptation is a means by which glomerular output codes for high concentration of odor.

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Received Dec. 30, 2008; revised Feb. 3, 2009; accepted Feb. 8, 2009.

Correspondence should be addressed to Serge Charpak, Institut National de la Santé et de la Recherche Médicale, U603, Laboratory of Neurophysiology, 45 rue des St Pères, 75006 Paris, France. Email: serge.charpak{at}parisdescartes.fr

This article has been cited by other articles:

				D. H. Gire and N. E. Schoppa Control of On/Off Glomerular Signaling by a Local GABAergic Microcircuit in the Olfactory Bulb J. Neurosci., October 28, 2009; 29(43): 13454 - 13464. [Abstract] [Full Text] [PDF]

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