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The Journal of Neuroscience, October 1, 2008, 28(40):9920-9928; doi:10.1523/JNEUROSCI.3082-08.2008

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Behavioral/Systems/Cognitive
Intrabulbar Projecting External Tufted Cells Mediate a Timing-Based Mechanism That Dynamically Gates Olfactory Bulb Output

Zhishang Zhou and Leonardo Belluscio

Developmental Neural Plasticity Unit, National Institute of Neurological Disorders and Stroke–National Institutes of Health, Bethesda, Maryland 20892

Correspondence should be addressed to Leonardo Belluscio at the above address. Email: belluscl{at}ninds.nih.gov

In the mammalian olfactory system, intrabulbar projections (IBPs) mediated by a class of external tufted cells (ET cells) specifically link isofunctional odor columns within the same olfactory bulb. To study the function of these ET cells within the glomerular network, we developed a "hemibulb" preparation that maintains IBPs intact enabling the select activation of ET cells associated with specific glomeruli. Using P2-GFP mice, a line in which the P2 glomeruli are labeled with green fluorescent protein, we recorded from P2 mitral cells (MT cells) while selectively stimulating P2 ET cells. Here, we show that ET-cell activity evokes a slow modulatory (SM) potential within MT cells, which is mediated by the glomerular network and consists of both excitatory and inhibitory components. Interestingly, the timing of the SM potential with respect to olfactory nerve (ON) stimulation can produce converse effects on MT-cell output. When ET-cell activity precedes ON stimulation, the MT-cell response is potentiated; however, when ET-cell activity follows ON stimulation, the MT-cell response is inhibited. Thus, intrabulbar projecting ET cells can shape olfactory bulb output through intraglomerular modulation of MT cells.

Key words: olfactory bulb; intrabulbar; glomerulus; external tufted cells; chemosensory; mice

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Received July 2, 2008; revised Aug. 5, 2008; accepted Aug. 28, 2008.

Correspondence should be addressed to Leonardo Belluscio at the above address. Email: belluscl{at}ninds.nih.gov

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