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The Journal of Neuroscience, March 12, 2008, 28(11):2919-2932; doi:10.1523/JNEUROSCI.5550-07.2008

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Development/Plasticity/Repair
Functional Maturation of the First Synapse in Olfaction: Development and Adult Neurogenesis

Matthew S. Grubb, Antoine Nissant, Kerren Murray, and Pierre-Marie Lledo

Perception and Memory Laboratory, Unité de Recherche Associée 2182, Centre National de la Recherche Scientifique, Institut Pasteur, F-75724 Paris Cedex 15, France

Correspondence should be addressed to Pierre-Marie Lledo, Perception and Memory Laboratory, Unité de Recherche Associée 2182, Centre National de la Recherche Scientifique, Institut Pasteur, 25 rue du Dr. Roux, F-75724 Paris Cedex 15, France. Email: pmlledo{at}pasteur.fr

The first synapse in olfaction undergoes considerable anatomical plasticity in both early postnatal development and adult neurogenesis, yet we know very little concerning its functional maturation at these times. Here, we used whole-cell recordings in olfactory bulb slices to describe olfactory nerve inputs to developing postnatal neurons and to maturing adult-born cells labeled with a GFP-encoding lentivirus. In both postnatal development and adult neurogenesis, the maturation of olfactory nerve synapses involved an increase in the relative contribution of AMPA over NMDA receptors, and a decrease in the contribution of NMDA receptors containing the NR2B subunit. These postsynaptic transformations, however, were not mirrored by presynaptic changes: in all cell groups, paired-pulse depression remained constant as olfactory nerve synapses matured. Although maturing cells may therefore offer, transiently, a functionally distinct connection for inputs from the nose, presynaptic function at the first olfactory connection remains remarkably constant in the face of considerable anatomical plasticity.

Key words: development; adult neurogenesis; olfaction; olfactory bulb; synapse; periglomerular cells

Received Aug. 24, 2007; accepted Jan. 15, 2008.

Correspondence should be addressed to Pierre-Marie Lledo, Perception and Memory Laboratory, Unité de Recherche Associée 2182, Centre National de la Recherche Scientifique, Institut Pasteur, 25 rue du Dr. Roux, F-75724 Paris Cedex 15, France. Email: pmlledo{at}pasteur.fr






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