Kei M Igarashi*
Trends in Neurosciences (2023)
The cover illustration was made by Aehyn Shin
Reconciling neuronal representations of schema, abstract task structure, and categorization under cognitive maps in the entorhinal-hippocampal-frontal circuits
Kei M Igarashi*, Jason Y Lee & Heechul Jun
Curr Opin Neurobiol (2022)
Dopamine facilitates associative memory encoding in the entorhinal cortex
Jason Y. Lee†, Heechul Jun†, Shogo Soma†, Tomoaki Nakazono†, Kaori Shiraiwa, Ananya Dasgupta, Tatsuki Nakagawa, Jiayun L. Xie, Jasmine Chavez, Rodrigo Romo, Sandra Yungblut, Meiko Hagihara, Koshi Murata & Kei M. Igarashi*
We found that dopamine facilitates associative memory encoding of fan cells in the lateral entorhinal cortex. Collaborative work by Jason, Heechul, Shogo & Tom.
UCI NEWS: New research “sniffs out” how associative memories are formed
Protocol for remapping of place cells in disease mouse models
Heechul Jun, Jasmine Chavez, Allen Bramian & Kei M Igarashi
STAR Protocols, (2021)
We describe our method to perform in vivo spike recording of Place cell/Grid cells in mice.
Disrupted Place Cell Remapping and Impaired Grid Cells in a Knockin Model of Alzheimer's Disease
Heechul Jun, Shogo Soma, Takashi Saito, Takaomi C Saido, Kei M Igarashi*
Heechul found that the remapping of place cells and grid cells were impaired in a third generation Alzheimer's disease mouse model.
Our work suggests that spatial memory loss in Alzheimer's patients is caused by the remapping impairment of place cells in the hippocampus.
Preview in Neuron
The Sound of Silence: Hidden Responses of Neural Circuits to Alzheimer-Linked Mutations
Press release from UCI School of Medicine
New discovery reveals brain network mechanism that causes spatial memory impairment in Alzheimer’s disease
Discussion in AlzForum
In APP Knock-In Mice, Spatial Mapping Circuitry Crumbles
Nakazono T*, Jun H*, Blurton-Jones, M, Green KN, Igarashi KM
Nakazono T, Lam TN, Patel AY, Kitazawa M, Saito T, Saido TC, Igarashi KM
Front Syst Neurosci
Curr Opin Neurobiol
Impaired sharp-wave ripple coordination between the medial entorhinal cortex and hippocampal CA1 of knock-in model of Alzheimer’s disease
Tsukasa Funane†, Heechul Jun†, Stephanie Sutoko†, Takaomi C Saido, Akihiko Kandori, Kei M Igarashi*
Front Syst Neurosci (2022)
Publication before UC Irvine
Topography of Place Maps along the CA3-to-CA2 Axis of the Hippocampus.
Lu L, Igarashi KM, Witter MP, Moser EI, Moser MB.
Neuron. 87:1078-92 (2015)
Coordination of entorhinal-hippocampal ensemble activity during associative learning.
Igarashi KM*, Lu L, Colgin LL, Moser MB, Moser EI* (*Co-corresponding authors)
Nature. 510: 143-7 (2014)
Functional diversity along the transverse axis of hippocampal area CA1.
Igarashi KM*, Ito HT, Moser EI, Moser, M-B. (*Corresponding author)
FEBS Lett. 588:2470-2476 (2014)
Parallel mitral and tufted cell pathways route distinct odor information to different targets in the olfactory cortex.
Igarashi KM*, Ieki N, An M, Yamaguchi Y, Nagayama S, Kobayakawa K, Kobayakawa R, Tanifuji M, Sakano H, Chen WR, Mori K* (*Co-corresponding authors)
Journal of Neuroscience. 32:7970-85 (2012)
Genetic visualization of the secondary olfactory pathway in Tbx21 transgenic mice.
Mitsui S, Igarashi KM, Mori K and Yoshihara Y
Neural Systems & Circuits. 1:5 (2011)
Swept source optical coherence tomography as a tool for real time visualization and localization of electrodes used in electrophysiological studies of brain in vivo.
Watanabe H, Rajagopalan UM, Nakamichi Y, Igarashi KM, Kadono H, Tanifuji M.
Biomedical Optics Express. 2:3129-3134 (2011)
In vivo layer visualization of rat olfactory bulb by a swept source optical coherence tomography and its confirmation through electrocoagulation and anatomy.
Watanabe H, Rajagopalan UM, Nakamichi Y, Igarashi KM, Madjarova VD, Kadono H, Tanifuji M.
Biomedical Optics Express. 2:2279-2287 (2011)
Two highly homologous mouse odorant receptors encoded by tandemly-linked MOR29A and MOR29B genes respond differently to phenyl ethers.
Tsuboi A, Imai T, Kato HK, Matsumoto H, Igarashi KM, Suzuki M, Mori K, Sakano H.
European Journal of Neuroscience. 33:205-13 (2011)
Differential axonal projection of mitral and tufted cells in the mouse main olfactory system.
Nagayama S, Enerva A, Fletcher ML, Masurkar AV, Igarashi KM, Mori K, Chen WR.
Frontiers in Neural Circuits. 4. Pii120 (2010)
Dendrodendritic synapses and functional compartmentalization in the olfactory bulb.
Mori K, Matsumoto H, Tsuno Y, Igarashi KM.
Ann N Y Acad Sci. 1070:255-258 (2009)
Maps of odorant molecular features in the Mammalian olfactory bulb.
Mori K, Takahashi YK, Igarashi KM, Yamaguchi M.
Physiol Rev. 86:409-433 (2006)
Spatial representation of hydrocarbon odorants in the ventrolateral zones of the rat olfactory bulb.
Igarashi KM, Mori K.
Journal of Neurophysiology. 93:1007-1019 (2005)
Odor Maps in the Dorsal and Lateral Surfaces of the Rat Olfactory Bulb.
Mori K, Takahashi YK, Igarashi K, and Nagayama S
Chemical Senses. 30:i103-i104 (2005)