000155629 001__ 155629 000155629 005__ 20240404115647.0 000155629 0247_ $$2doi$$a10.1523/ENEURO.0354-20.2020 000155629 0247_ $$2pmid$$apmid:33531369 000155629 0247_ $$2pmc$$apmc:PMC8114875 000155629 0247_ $$2altmetric$$aaltmetric:99309055 000155629 037__ $$aDZNE-2021-00797 000155629 041__ $$aEnglish 000155629 082__ $$a610 000155629 1001_ $$aGrosser, Sabine$$b0 000155629 245__ $$aParvalbumin Interneurons Are Differentially Connected to Principal Cells in Inhibitory Feedback Microcircuits along the Dorsoventral Axis of the Medial Entorhinal Cortex. 000155629 260__ $$aWashington, DC$$bSoc.$$c2021 000155629 3367_ $$2DRIVER$$aarticle 000155629 3367_ $$2DataCite$$aOutput Types/Journal article 000155629 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1712148737_27004 000155629 3367_ $$2BibTeX$$aARTICLE 000155629 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000155629 3367_ $$00$$2EndNote$$aJournal Article 000155629 520__ $$aThe medial entorhinal cortex (mEC) shows a high degree of spatial tuning, predominantly grid cell activity, which is reliant on robust, dynamic inhibition provided by local interneurons (INs). In fact, feedback inhibitory microcircuits involving fast-spiking parvalbumin (PV) basket cells (BCs) are believed to contribute dominantly to the emergence of grid cell firing in principal cells (PrCs). However, the strength of PV BC-mediated inhibition onto PrCs is not uniform in this region, but high in the dorsal and weak in the ventral mEC. This is in good correlation with divergent grid field sizes, but the underlying morphologic and physiological mechanisms remain unknown. In this study, we examined PV BCs in layer (L)2/3 of the mEC characterizing their intrinsic physiology, morphology and synaptic connectivity in the juvenile rat. We show that while intrinsic physiology and morphology are broadly similar over the dorsoventral axis, PV BCs form more connections onto local PrCs in the dorsal mEC, independent of target cell type. In turn, the major PrC subtypes, pyramidal cell (PC) and stellate cell (SC), form connections onto PV BCs with lower, but equal probability. These data thus identify inhibitory connectivity as source of the gradient of inhibition, plausibly explaining divergent grid field formation along this dorsoventral axis of the mEC. 000155629 536__ $$0G:(DE-HGF)POF4-351$$a351 - Brain Function (POF4-351)$$cPOF4-351$$fPOF IV$$x0 000155629 588__ $$aDataset connected to CrossRef, PubMed, , Journals: pub.dzne.de 000155629 650_7 $$2Other$$aGABAergic interneurons 000155629 650_7 $$2Other$$aentorhinal cortex 000155629 650_7 $$2Other$$afeedback inhibition 000155629 650_7 $$2Other$$amicrocircuit 000155629 650_7 $$2Other$$amorphology 000155629 650_7 $$2Other$$asynapse 000155629 650_7 $$2NLM Chemicals$$aParvalbumins 000155629 650_2 $$2MeSH$$aAction Potentials 000155629 650_2 $$2MeSH$$aAnimals 000155629 650_2 $$2MeSH$$aEntorhinal Cortex: metabolism 000155629 650_2 $$2MeSH$$aFeedback 000155629 650_2 $$2MeSH$$aInterneurons: metabolism 000155629 650_2 $$2MeSH$$aParvalbumins: metabolism 000155629 650_2 $$2MeSH$$aPyramidal Cells: metabolism 000155629 650_2 $$2MeSH$$aRats 000155629 7001_ $$aBarreda, Federico J$$b1 000155629 7001_ $$0P:(DE-2719)2810901$$aBeed, Prateep Sanker$$b2$$udzne 000155629 7001_ $$0P:(DE-2719)2810725$$aSchmitz, Dietmar$$b3$$udzne 000155629 7001_ $$00000-0003-1980-9873$$aBooker, Sam A$$b4 000155629 7001_ $$00000-0003-3214-2233$$aVida, Imre$$b5 000155629 773__ $$0PERI:(DE-600)2800598-3$$a10.1523/ENEURO.0354-20.2020$$gVol. 8, no. 1, p. 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