{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T14:49:58Z","timestamp":1790002198483,"version":"4.0.1"},"reference-count":40,"publisher":"MDPI AG","issue":"15","license":[{"start":{"date-parts":[[2021,7,31]],"date-time":"2021-07-31T00:00:00Z","timestamp":1627689600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100012190","name":"Ministry of Science and Higher Education of the Russian Federation","doi-asserted-by":"publisher","award":["075-15-2020-801"],"award-info":[{"award-number":["075-15-2020-801"]}],"id":[{"id":"10.13039\/501100012190","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>The parietal cortex of rodents participates in sensory and spatial processing, movement planning, and decision-making, but much less is known about its role in associative learning and memory formation. The present study aims to examine the involvement of the parietal association cortex (PtA) in associative fear memory acquisition and retrieval in mice. Using ex vivo c-Fos immunohistochemical mapping and in vivo Fos-EGFP two-photon imaging, we show that PtA neurons were specifically activated both during acquisition and retrieval of cued fear memory. Fos immunohistochemistry revealed specific activation of the PtA neurons during retrieval of the 1-day-old fear memory. In vivo two-photon Fos-EGFP imaging confirmed this result and in addition detected specific c-Fos responses of the PtA neurons during acquisition of cued fear memory. To allow a more detailed study of the long-term activity of such PtA engram neurons, we generated a Fos-Cre-GCaMP transgenic mouse line that employs the Targeted Recombination in Active Populations (TRAP) technique to detect calcium events specifically in cells that were Fos-active during conditioning. We show that gradual accumulation of GCaMP3 in the PtA neurons of Fos-Cre-GCaMP mice peaks at the 4th day after fear learning. We also describe calcium transients in the cell bodies and dendrites of the TRAPed neurons. This provides a proof-of-principle for TRAP-based calcium imaging of PtA functions during memory processes as well as in experimental models of fear- and anxiety-related psychiatric disorders and their specific therapies.<\/jats:p>","DOI":"10.3390\/ijms22158244","type":"journal-article","created":{"date-parts":[[2021,8,1]],"date-time":"2021-08-01T21:51:07Z","timestamp":1627854667000},"page":"8244","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Imaging of C-fos Activity in Neurons of the Mouse Parietal Association Cortex during Acquisition and Retrieval of Associative Fear Memory"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1540-7677","authenticated-orcid":false,"given":"Olga I.","family":"Ivashkina","sequence":"first","affiliation":[{"name":"Institute for Advanced Brain Studies, Lomonosov Moscow State University, 119991 Moscow, Russia"},{"name":"National Research Center \u201cKurchatov Institute\u201d, 123182 Moscow, Russia"},{"name":"Laboratory for Neurobiology of Memory, P.K. Anokhin Institute of Normal Physiology, 125315 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5691-9057","authenticated-orcid":false,"given":"Anna M.","family":"Gruzdeva","sequence":"additional","affiliation":[{"name":"National Research Center \u201cKurchatov Institute\u201d, 123182 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marina A.","family":"Roshchina","sequence":"additional","affiliation":[{"name":"Institute of Higher Nervous Activity and Neurophysiology of RAS, 117485 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ksenia A.","family":"Toropova","sequence":"additional","affiliation":[{"name":"Institute for Advanced Brain Studies, Lomonosov Moscow State University, 119991 Moscow, Russia"},{"name":"National Research Center \u201cKurchatov Institute\u201d, 123182 Moscow, Russia"},{"name":"Laboratory for Neurobiology of Memory, P.K. Anokhin Institute of Normal Physiology, 125315 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Konstantin V.","family":"Anokhin","sequence":"additional","affiliation":[{"name":"Institute for Advanced Brain Studies, Lomonosov Moscow State University, 119991 Moscow, Russia"},{"name":"Laboratory for Neurobiology of Memory, P.K. Anokhin Institute of Normal Physiology, 125315 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,7,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1219","DOI":"10.1016\/j.neuron.2018.01.044","article-title":"An Integrative Framework for Sensory, Motor, and Cognitive Functions of the Posterior Parietal Cortex","volume":"97","author":"Freedman","year":"2018","journal-title":"Neuron"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1016\/B978-0-444-63622-5.00001-2","article-title":"The history of the neurophysiology and neurology of the parietal lobe","volume":"151","author":"Berlucchi","year":"2018","journal-title":"Handb. Clin. 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