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Kwanghun Chung

Feng-Ju Weng, Rodrigo I Garcia, Stefano Lutzu, Karina Alviña, Yuxiang Zhang, Margaret Dushko, Taeyun Ku, Khaled Zemoura, David Rich, Dario Garcia-Dominguez, Matthew Hung, Tushar D Yelhekar, Andreas Toft Sørensen, Weifeng Xu, Kwanghun Chung, Pablo E Castillo, Yingxi Lin
Synaptic connections between hippocampal mossy fibers (MFs) and CA3 pyramidal neurons are essential for contextual memory encoding, but the molecular mechanisms regulating MF-CA3 synapses during memory formation and the exact nature of this regulation are poorly understood. Here we report that the activity-dependent transcription factor Npas4 selectively regulates the structure and strength of MF-CA3 synapses by restricting the number of their functional synaptic contacts without affecting the other synaptic inputs onto CA3 pyramidal neurons...
March 7, 2018: Neuron
Norman Lippok, Martin Villiger, Alexandre Albanese, Eelco F J Meijer, Kwanghun Chung, Timothy P Padera, Sangeeta N Bhatia, Brett E Bouma
Owing to their electromagnetic properties, tunability and biocompatibility, gold nanorods (GNRs) are being investigated as multifunctional probes for a range of biomedical applications. However, detection beyond the reach of traditional fluorescence and two-photon approaches and quantitation of their concentration in biological tissue remain challenging tasks in microscopy. Here we show how the size and aspect ratio that impart GNRs with their plasmonic properties also make them a source of entropy. We report on how depolarization can be exploited as a strategy to visualize GNR diffusion and distribution in biologically relevant scenarios ex vivo , in vitro and in vivo ...
2017: Nature Photonics
Kelly R Stevens, Margaret A Scull, Vyas Ramanan, Chelsea L Fortin, Ritika R Chaturvedi, Kristin A Knouse, Jing W Xiao, Canny Fung, Teodelinda Mirabella, Amanda X Chen, Margaret G McCue, Michael T Yang, Heather E Fleming, Kwanghun Chung, Ype P de Jong, Christopher S Chen, Charles M Rice, Sangeeta N Bhatia
Control of both tissue architecture and scale is a fundamental translational roadblock in tissue engineering. An experimental framework that enables investigation into how architecture and scaling may be coupled is needed. We fabricated a structurally organized engineered tissue unit that expanded in response to regenerative cues after implantation into mice with liver injury. Specifically, we found that tissues containing patterned human primary hepatocytes, endothelial cells, and stromal cells in a degradable hydrogel expanded more than 50-fold over the course of 11 weeks in mice with injured livers...
July 19, 2017: Science Translational Medicine
Kwanghun Chung
A 3D hydrogel enables rapid and scalable production of oligodendrocyte progenitor cells for transplantation to treat demyelination diseases.
July 12, 2017: Science Translational Medicine
Kwanghun Chung
Human forebrain spheroids enable in vitro observation of region-specific neural migration and circuit formation during brain development.
June 7, 2017: Science Translational Medicine
Kwanghun Chung
Artificial thymic organoids may enable more efficient engineered T cell production for immunotherapy.
April 19, 2017: Science Translational Medicine
Jian Ren, Heejin Choi, Kwanghun Chung, Brett E Bouma
A central effort of today's neuroscience is to study the brain's 'wiring diagram'. The nervous system is believed to be a network of neurons interacting with each other through synaptic connection between axons and dendrites, therefore the neuronal connectivity map not only depicts the underlying anatomy, but also has important behavioral implications. Different approaches have been utilized to decipher neuronal circuits, including electron microscopy (EM) and light microscopy (LM). However, these approaches typically demand extensive sectioning and reconstruction for a brain sample...
April 12, 2017: Scientific Reports
Sang Yeon Cho, Kwanghun Kim, Min Soo Park, Mi Young Jang, Young Hwan Choi, Suyeon Han, Hyun Mo Shin, Chaeuk Chung, Hye Young Han, Jung Bo Yang, Young Bok Ko, Heon Jong Yoo
Yes-associated protein 1 (YAP1) is a key transcriptional regulator in the Hippo signaling pathway that plays a critical role in the development and progression of several types of malignancies, including ovarian cancer. Herein, we investigated the expression of YAP1 and its clinical significance in a large population of patients with ovarian serous cystadenocarcinoma (OSC), which is the most common form of epithelial ovarian neoplasm, using the TCGA database. Surprisingly, cross-cancer mRNA expression and alterations in YAP1 were higher in OSC than in those of other types of cancers in the TCGA database...
May 2017: Oncology Reports
Magdalena Renner, Madeline A Lancaster, Shan Bian, Heejin Choi, Taeyun Ku, Angela Peer, Kwanghun Chung, Juergen A Knoblich
Cerebral organoids recapitulate human brain development at a considerable level of detail, even in the absence of externally added signaling factors. The patterning events driving this self-organization are currently unknown. Here, we examine the developmental and differentiative capacity of cerebral organoids. Focusing on forebrain regions, we demonstrate the presence of a variety of discrete ventral and dorsal regions. Clearing and subsequent 3D reconstruction of entire organoids reveal that many of these regions are interconnected, suggesting that the entire range of dorso-ventral identities can be generated within continuous neuroepithelia...
May 15, 2017: EMBO Journal
Kwanghun Chung
Protein-gene interactome map reveals how Zika virus overrides molecular machinery in human neurospheres.
March 8, 2017: Science Translational Medicine
Young Sup Woo, Won-Myong Bahk, Young-Min Park, Sangkeun Chung, Bo-Hyun Yoon, Seunghee Won, Jeong Goo Lee, Hwang-Bin Lee, Won Kim, Jong-Hyun Jeong, Kwanghun Lee, Moon-Doo Kim
We evaluated the effectiveness of aripiprazole among bipolar patients who had switched to this medication as a result of difficulty maintaining on their prestudy atypical antipsychotics (AAPs) because of subsyndromal mood symptoms or intolerance. This study included 77 bipolar patients who were in syndromal remission with an AAP as monotherapy or with an AAP combined with a mood stabilizer(s) who needed to switch from their present AAP because of subsyndromal symptoms or intolerance. At 24 weeks after switching to aripiprazole, the remission rates on the Montgomery-Åsberg Depression Rating Scale (MADRS) and on both the MADRS and the Young Mania Rating Scale were increased significantly in the full sample and in the inefficacy subgroup...
September 2016: International Clinical Psychopharmacology
Taeyun Ku, Justin Swaney, Jeong-Yoon Park, Alexandre Albanese, Evan Murray, Jae Hun Cho, Young-Gyun Park, Vamsi Mangena, Jiapei Chen, Kwanghun Chung
The biology of multicellular organisms is coordinated across multiple size scales, from the subnanoscale of molecules to the macroscale, tissue-wide interconnectivity of cell populations. Here we introduce a method for super-resolution imaging of the multiscale organization of intact tissues. The method, called magnified analysis of the proteome (MAP), linearly expands entire organs fourfold while preserving their overall architecture and three-dimensional proteome organization. MAP is based on the observation that preventing crosslinking within and between endogenous proteins during hydrogel-tissue hybridization allows for natural expansion upon protein denaturation and dissociation...
September 2016: Nature Biotechnology
Young-Eun Jung, Moon-Doo Kim, Won-Myong Bahk, Young Sup Woo, Jonghun Lee, Sae-Heon Jang, Seunghee Won, Kyung Joon Min, Sangkeun Chung, Young-Joon Kwon, Duk-In Jon, Kwanghun Lee, Bo-Hyun Yoon
BACKGROUND: The Bipolar Depression Rating Scale (BDRS) is a scale for assessment of the clinical characteristics of bipolar depression. The primary aims of this study were to describe the development of the Korean version of the BDRS (K-BDRS) and to establish more firmly its psychometric properties in terms of reliability and validity. METHODS: The study included 141 patients (62 male and 79 female) who had been diagnosed with bipolar disorder, were currently experiencing symptoms of depression, and were interviewed using the K-BDRS...
July 15, 2016: BMC Psychiatry
Alexandre Albanese, Kwanghun Chung
Advances in microscopy and sample preparation have led to the first ever mapping of individual neurons in the whole mouse brain.
January 20, 2016: ELife
Evan Murray, Jae Hun Cho, Daniel Goodwin, Taeyun Ku, Justin Swaney, Sung-Yon Kim, Heejin Choi, Young-Gyun Park, Jeong-Yoon Park, Austin Hubbert, Margaret McCue, Sara Vassallo, Naveed Bakh, Matthew P Frosch, Van J Wedeen, H Sebastian Seung, Kwanghun Chung
Combined measurement of diverse molecular and anatomical traits that span multiple levels remains a major challenge in biology. Here, we introduce a simple method that enables proteomic imaging for scalable, integrated, high-dimensional phenotyping of both animal tissues and human clinical samples. This method, termed SWITCH, uniformly secures tissue architecture, native biomolecules, and antigenicity across an entire system by synchronizing the tissue preservation reaction. The heat- and chemical-resistant nature of the resulting framework permits multiple rounds (>20) of relabeling...
December 3, 2015: Cell
Sung-Yon Kim, Jae Hun Cho, Evan Murray, Naveed Bakh, Heejin Choi, Kimberly Ohn, Luzdary Ruelas, Austin Hubbert, Meg McCue, Sara L Vassallo, Philipp J Keller, Kwanghun Chung
Nondestructive chemical processing of porous samples such as fixed biological tissues typically relies on molecular diffusion. Diffusion into a porous structure is a slow process that significantly delays completion of chemical processing. Here, we present a novel electrokinetic method termed stochastic electrotransport for rapid nondestructive processing of porous samples. This method uses a rotational electric field to selectively disperse highly electromobile molecules throughout a porous sample without displacing the low-electromobility molecules that constitute the sample...
November 17, 2015: Proceedings of the National Academy of Sciences of the United States of America
Hoo Rim Song, Young-Joon Kwon, Won-Myong Bahk, Young Sup Woo, Hwang-Bin Lee, Jonghun Lee, Dae-Bo Lee, Sang-Yeol Lee, Moon-Doo Kim, Seunghee Won, Kwanghun Lee, Inki Sohn, Jung Goo Lee, Young-Chul Shin, Sangkeun Chung, Saeheon Jang, Young Myo Jae, Bo-Hyun Yoon
AIMS: We examined prescription patterns in maintenance treatment for recovered bipolar patients and compared these with acute treatments. METHODS: Using retrospective methods, the bipolar patients in clinical recovery (Clinical Global Impression Bipolar Version score ≤ 2 for 6 months) after acute episode were selected. We reviewed differences between prescription patterns at remission and after a maintenance period of at least 6 months. RESULTS: A total of 340 bipolar disorder patients were selected...
January 2016: Psychiatry and Clinical Neurosciences
Randal Burns, William Gray Roncal, Dean Kleissas, Kunal Lillaney, Priya Manavalan, Eric Perlman, Daniel R Berger, Davi D Bock, Kwanghun Chung, Logan Grosenick, Narayanan Kasthuri, Nicholas C Weiler, Karl Deisseroth, Michael Kazhdan, Jeff Lichtman, R Clay Reid, Stephen J Smith, Alexander S Szalay, Joshua T Vogelstein, R Jacob Vogelstein
We describe a scalable database cluster for the spatial analysis and annotation of high-throughput brain imaging data, initially for 3-d electron microscopy image stacks, but for time-series and multi-channel data as well. The system was designed primarily for workloads that build connectomes- neural connectivity maps of the brain-using the parallel execution of computer vision algorithms on high-performance compute clusters. These services and open-science data sets are publicly available at
2013: Scientific and Statistical Database Management: International Conference, SSDBM ...: Proceedings
Sung-Yon Kim, Kwanghun Chung, Karl Deisseroth
Mapping of neural connectivity across the mammalian brain is a daunting and exciting prospect. Current approaches can be divided into three classes: macroscale, focusing on coarse inter-regional connectivity; mesoscale, involving a finer focus on neurons and projections; and microscale, reconstructing full details of all synaptic contacts. It remains to be determined how to bridge the datasets or insights from the different levels of study. Here we review recent light-microscopy-based approaches that may help in integration across scales...
December 2013: Trends in Cognitive Sciences
Kwanghun Chung, Karl Deisseroth
With potential relevance for brain-mapping work, hydrogel-based structures can now be built from within biological tissue to allow subsequent removal of lipids without mechanical disassembly of the tissue. This process creates a tissue-hydrogel hybrid that is physically stable, that preserves fine structure, proteins and nucleic acids, and that is permeable to both visible-spectrum photons and exogenous macromolecules. Here we highlight relevant challenges and opportunities of this approach, especially with regard to integration with complementary methodologies for brain-mapping studies...
June 2013: Nature Methods
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