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PGCs and SACs provide feedforward inhibition to all classes of projection neurons, but inhibition between PGCs and SACs is not well understood. We crossed Cre and GFP transgenic mice and used virally-delivered optogenetic constructs to selectively activate either SACs or GAD65cre-ChR2-positive PGCs while recording from identified GAD65cre-ChR2-positive PGCs or SACs, respectively, to investigate inhibitory interactions between these two interneuron types. We show that GAD65cre-ChR2-positive PGCs robustly inhibit SACs and SACs strongly inhibit PGCs. SACs form the interglomerular circuit, which inhibits PGCs in distant glomeruli. Activation of GAD65cre-ChR2-positive PGCs monosynaptically inhibit mitral cells (MCs), which complements recent findings that SACs directly inhibit MCs. Thus, both classes of glomerular inhibitory neurons inhibit each other, as well as OB output neurons. We further show that olfactory nerve input to one glomerulus engages the interglomerular circuit and inhibits PGCs in distant glomeruli. Sensory activation of the interglomerular circuit directly inhibits output neurons in other glomeruli and by inhibiting intraglomerular PGCs, may potentially disinhibit output neurons in other glomeruli. The nature and context of odorant stimuli may determine whether inhibition or excitation prevails so that odors are represented in part by patterns of active and inactive glomeruli.<\/jats:p>","DOI":"10.1523\/eneuro.0048-19.2019","type":"journal-article","created":{"date-parts":[[2019,5,30]],"date-time":"2019-05-30T21:45:14Z","timestamp":1559252714000},"page":"ENEURO.0048-19.2019","source":"Crossref","is-referenced-by-count":18,"title":["Reciprocal Inhibitory Glomerular Circuits Contribute to Excitation\u2013Inhibition Balance in the Mouse Olfactory Bulb"],"prefix":"10.1523","volume":"6","author":[{"given":"Zuoyi","family":"Shao","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3351-8642","authenticated-orcid":false,"given":"Shaolin","family":"Liu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fuwen","family":"Zhou","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Adam C.","family":"Puche","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael T.","family":"Shipley","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"393","published-online":{"date-parts":[[2019,5,30]]},"reference":[{"key":"2023041302134340000_6.3.ENEURO.0048-19.2019.1","doi-asserted-by":"publisher","DOI":"10.1152\/jn.2000.84.3.1194"},{"key":"2023041302134340000_6.3.ENEURO.0048-19.2019.2","doi-asserted-by":"publisher","DOI":"10.1038\/nature02185"},{"key":"2023041302134340000_6.3.ENEURO.0048-19.2019.3","doi-asserted-by":"publisher","DOI":"10.1523\/JNEUROSCI.21-21-08505.2001"},{"key":"2023041302134340000_6.3.ENEURO.0048-19.2019.4","doi-asserted-by":"publisher","DOI":"10.1016\/j.neuron.2015.06.019"},{"key":"2023041302134340000_6.3.ENEURO.0048-19.2019.5","doi-asserted-by":"publisher","DOI":"10.1016\/S0304-3940(99)00697-7"},{"key":"2023041302134340000_6.3.ENEURO.0048-19.2019.6","doi-asserted-by":"publisher","DOI":"10.1523\/JNEUROSCI.4342-12.2013"},{"key":"2023041302134340000_6.3.ENEURO.0048-19.2019.7","doi-asserted-by":"publisher","DOI":"10.1152\/jn.00847.2015"},{"key":"2023041302134340000_6.3.ENEURO.0048-19.2019.8","doi-asserted-by":"publisher","DOI":"10.1523\/JNEUROSCI.2880-16.2016"},{"key":"2023041302134340000_6.3.ENEURO.0048-19.2019.9","doi-asserted-by":"publisher","DOI":"10.1523\/JNEUROSCI.20-05-02011.2000"},{"key":"2023041302134340000_6.3.ENEURO.0048-19.2019.10","doi-asserted-by":"publisher","DOI":"10.1111\/j.1460-9568.2004.03584.x"},{"key":"2023041302134340000_6.3.ENEURO.0048-19.2019.11","doi-asserted-by":"publisher","DOI":"10.1523\/JNEUROSCI.2870-06.2007"},{"key":"2023041302134340000_6.3.ENEURO.0048-19.2019.12","doi-asserted-by":"publisher","DOI":"10.1523\/JNEUROSCI.5317-08.2009"},{"key":"2023041302134340000_6.3.ENEURO.0048-19.2019.13","doi-asserted-by":"publisher","DOI":"10.1016\/j.neuron.2016.06.001"},{"key":"2023041302134340000_6.3.ENEURO.0048-19.2019.14","doi-asserted-by":"crossref","unstructured":"Ennis M , Puche AC , Holy TE , Shipley MT (2014) The olfactory system. 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