期刊
NEURON
卷 80, 期 5, 页码 1218-1231出版社
CELL PRESS
DOI: 10.1016/j.neuron.2013.08.036
关键词
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资金
- Japan Science and Technology Agency (PRESTO)
- Pew Charitable Trusts
- Alfred P. Sloan Foundation
- David & Lucile Packard Foundation
- New York Stem Cell Foundation
- NIH [R01, DC04682, R21, DC012641]
- Neuroplasticity of Aging Training Grant [AG000216]
In the olfactory bulb, odor representations by principal mitral cells are modulated by local inhibitory circuits. While dendrodendritic synapses between mitral and granule cells are typically thought to be a major source of this modulation, the contributions of other inhibitory neurons remain unclear. Here we demonstrate the functional properties of olfactory bulb parvalbumin-expressing interneurons (PV cells) and identify their important role in odor coding. Using paired recordings, we find that PV cells form reciprocal connections with the majority of nearby mitral cells, in contrast to the sparse connectivity between mitral and granule cells. In vivo calcium imaging in awake mice reveals that PV cells are broadly tuned to odors. Furthermore, selective PV cell inactivation enhances mitral cell responses in a linear fashion while maintaining mitral cell odor preferences. Thus, dense connections between mitral and PV cells underlie an inhibitory circuit poised to modulate the gain of olfactory bulb output.
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