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To characterize VPCs in detail, we combined various electrophysiological, neuroanatomical, and two-photon Ca<jats:sup>2+<\/jats:sup>imaging techniques in acute bulb slices from juvenile transgenic rats with eGFP-labeled VPCs. VPCs showed regular non-bursting firing patterns, and displayed slower membrane time constants and higher input resistances versus other glutamatergic tufted cell types. VPC axons spread deeply into the external plexiform and superficial granule cell layer (GCL). Axonal projections fell into two subclasses, with either denser local columnar collaterals or longer-ranging single projections running laterally within the internal plexiform layer and deeper within the granule cell layer. VPCs always featured lateral dendrites and a tortuous apical dendrite that innervated a single glomerulus with a homogenously branching tuft. These tufts lacked Ca<jats:sup>2+<\/jats:sup>transients in response to single somatically-evoked action potentials and showed a moderate Ca<jats:sup>2+<\/jats:sup>increase upon prolonged action potential trains.<\/jats:p><jats:p>Notably, electrical olfactory nerve stimulation did not result in synaptic excitation of VPCs, but triggered substantial GABA<jats:sub>A<\/jats:sub>receptor-mediated IPSPs that masked excitatory barrages with yet longer latency. Exogenous vasopressin application reduced those IPSPs, as well as olfactory nerve-evoked EPSPs recorded from external tufted cells. In summary, VPCs can be classified as non-bursting, vertical superficial tufted cells. Moreover, our findings imply that sensory input alone cannot trigger excitation of VPCs, arguing for specific additional pathways for excitation or disinhibition in social contexts.<\/jats:p>","DOI":"10.1523\/eneuro.0431-18.2019","type":"journal-article","created":{"date-parts":[[2019,6,19]],"date-time":"2019-06-19T21:49:02Z","timestamp":1560980942000},"page":"ENEURO.0431-18.2019","source":"Crossref","is-referenced-by-count":17,"title":["Vasopressin Cells in the Rodent Olfactory Bulb Resemble Non-Bursting Superficial Tufted Cells and Are Primarily Inhibited upon Olfactory Nerve Stimulation"],"prefix":"10.1523","volume":"6","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4287-7367","authenticated-orcid":false,"given":"Michael","family":"Lukas","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5729-997X","authenticated-orcid":false,"given":"Hajime","family":"Suyama","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5869-8523","authenticated-orcid":false,"given":"Veronica","family":"Egger","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"393","published-online":{"date-parts":[[2019,6,19]]},"reference":[{"key":"2023041302135236000_6.4.ENEURO.0431-18.2019.1","doi-asserted-by":"publisher","DOI":"10.1016\/j.neuron.2010.01.009"},{"key":"2023041302135236000_6.4.ENEURO.0431-18.2019.2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1460-9568.2006.04988.x"},{"key":"2023041302135236000_6.4.ENEURO.0431-18.2019.3","doi-asserted-by":"publisher","DOI":"10.1152\/jn.1999.82.1.489"},{"key":"2023041302135236000_6.4.ENEURO.0431-18.2019.4","doi-asserted-by":"publisher","DOI":"10.1038\/nature02185"},{"key":"2023041302135236000_6.4.ENEURO.0431-18.2019.5","doi-asserted-by":"publisher","DOI":"10.3389\/fncir.2012.00084"},{"key":"2023041302135236000_6.4.ENEURO.0431-18.2019.6","doi-asserted-by":"publisher","DOI":"10.1016\/S0306-4522(98)00525-9"},{"key":"2023041302135236000_6.4.ENEURO.0431-18.2019.7","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.physiol.010908.163137"},{"key":"2023041302135236000_6.4.ENEURO.0431-18.2019.8","doi-asserted-by":"publisher","DOI":"10.1523\/JNEUROSCI.05-01-00081.1985"},{"key":"2023041302135236000_6.4.ENEURO.0431-18.2019.9","doi-asserted-by":"publisher","DOI":"10.1098\/rstb.2006.1931"},{"key":"2023041302135236000_6.4.ENEURO.0431-18.2019.10","doi-asserted-by":"publisher","DOI":"10.1016\/S0079-6123(08)64379-4"},{"key":"2023041302135236000_6.4.ENEURO.0431-18.2019.11","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.2013.269886"},{"key":"2023041302135236000_6.4.ENEURO.0431-18.2019.12","doi-asserted-by":"publisher","DOI":"10.3389\/fnana.2016.00127"},{"key":"2023041302135236000_6.4.ENEURO.0431-18.2019.13","doi-asserted-by":"crossref","unstructured":"Camats Perna J , Engelmann M (2017) Recognizing others: rodent\u2019s social memories. 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