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Hwang, In Koo,Choi, Jung Hoon,Nam, Sung Min,Park, Ok Kyu,Yoo, Dae Young,Kim, Woosuk,Yi, Sun Shin,Won, Moo-Ho,Seong, Je Kyung,Yoon, Yeo Sung Butterworths [etc.] 2014 Neurological research Vol.36 No.9
<P>The majority of immune cells in the brain are comprised of microglia, which undergo morphological changes when activated to remove damaged neurons and infectious agents from the brain tissue. In this study, we investigated the effects of type 2 diabetes on microglial activation and the subsequent secretion of pro-inflammatory cytokines, such as interferon-gamma (IFN-gamma) and interleukin-1beta (IL-1beta), in the hippocampus using Zucker diabetic fatty (ZDF) rats and Zucker lean control (ZLC) rats at various diabetic stages.</P>
Hwang, Min-Kyu,Lee, Hwa-Sung,Jang, Yun-Seok,Cho, Jeong-Ho,Lee, Shic-Hoon,Kim, Do-Hwan,Cho, Kil-Won The Polymer Society of Korea 2009 Macromolecular Research Vol.17 No.6
We improved the performance of pentacene-based thin film transistors by changing the curing environment of poly(4-vinylphenol) (PVP) gate dielectrics, while keeping the dielectric constant the same. The field-effect mobility of the pentacene TFTs constructed using the vacuum cured PVP was higher than that of the device based on the Ar flow cured gate dielectric, possibly due to the higher crystalline perfection of the pentacene films. The present results demonstrated that the curing conditions used can markedly affect the surface energy of polymer gate dielectrics, thereby affecting the field-effect mobility of TFTs based on those dielectrics.
Hwang, Do Won,Choi, Yoori,Kim, Dohyun,Park, Hye Yoon,Kim, Kyu Wan,Kim, Mee Young,Park, Chul-Kee,Lee, Dong Soo Elsevier 2019 NANOMEDICINE Vol.16 No.-
<P><B>Abstract</B></P> <P>FISH-based RNA detection in paraffin-embedded tissue can be challenging, with complicated procedures producing uncertain results and poor image quality. Here, we developed a robust RNA detection method based on graphene oxide (GO) quenching and recovery of fluorescence <I>in situ</I> hybridization (G-FISH) in formalin-fixed paraffin-embedded (FFPE) tissues. Using a fluorophore-labeled peptide nucleic acid (PNA) attached to GO, the endogenous long noncoding RNA BC1, the constitutive protein β-actin mRNA, and miR-124a and miR-21 could be detected in the cytoplasm of a normal mouse brain, primary cultured hippocampal neurons, an Alzheimer's disease model mouse brain, and glioblastoma multiforme tumor tissues, respectively. Coding and non-coding RNAs, either long or short, could be detected in deparaffinized FFPE or frozen tissues, as well as in clear <B>lipid-exchanged anatomically rigid imaging/immunostaining-compatible tissue hydrogel</B> (CLARITY)-transparent brain tissues. The fluorescence recovered by G-FISH correlated highly with the amount of miR-21, as measured by quantitative real time RT-PCR. We propose G-FISH as a simple, fast, inexpensive, and sensitive method for RNA detection, with a very low background, which could be applied to a variety of research or diagnostic purposes.</P> <P><B>Graphical Abstract</B></P> <P>Fluorescence <I>in situ</I> hybridization (FISH) method for RNA detection in paraffin-embedded tissue contains complicated protocols with poor image quality. In this study, we developed a robust nanoplatform using graphene oxide (GO) quenching and recovery of fluorescence <I>in situ</I> hybridization (G-FISH) for sensitive RNA detection in formalin-fixed paraffin-embedded (FFPE) tissues. A carboxyfluorescein (FAM) dye-decorated peptide nucleic acid (PNA) probe complementary to the target RNA was attached to graphene oxide. Rapid hybridization between the FAM-PNA probes and target RNAs leads to recovery of fluorescence signals in FFPE tissue section. Brain specific BC1 long noncoding RNA and miR-124a expression was markedly detected in paraffin-embedded brain tissue. The difference in BC1 expression was seen in brain section of Alzheimer's disease model. G-FISH also showed highly expressed miR-21 level in human glioblastoma brain tissue sample.</P> <P>[DISPLAY OMISSION]</P>
Hwang Nahee,Yoon Bo Kyung,Chun Kyu-Hye,Kim Hyeonhui,Lee Yoseob,Kim Jae-Won,Jeon Hyeonuk,Kim Tae-Hyun,Kim Mi-Young,Fang Sungsoon,Cheong Jae-Ho,Kim Jae-woo 생화학분자생물학회 2023 Experimental and molecular medicine Vol.55 No.-
Despite advances in cancer therapy, the clinical outcome of patients with gastric cancer remains poor, largely due to tumor heterogeneity. Thus, finding a hidden vulnerability of clinically refractory subtypes of gastric cancer is crucial. Here, we report that chemoresistant gastric cancer cells rely heavily on endocytosis, facilitated by caveolin-1, for survival. caveolin-1 was highly upregulated in the most malignant stem-like/EMT/mesenchymal (SEM)-type gastric cancer cells, allowing caveolin-1-mediated endocytosis and utilization of extracellular proteins via lysosomal degradation. Downregulation of caveolin-1 alone was sufficient to induce cell death in SEM-type gastric cancer cells, emphasizing its importance as a survival mechanism. Consistently, chloroquine, a lysosomal inhibitor, successfully blocked caveolin-1-mediated endocytosis, leading to the marked suppression of tumor growth in chemorefractory gastric cancer cells in vitro, including patient-derived organoids, and in vivo. Together, our findings suggest that caveolin-1-mediated endocytosis is a key metabolic pathway for gastric cancer survival and a potential therapeutic target.
First Report of the Mantid Shrimp Faughnia formosae (Stomatopoda: Parasquillidae) from Korea
Hwang, Hee-Seung,Lee, Sang-Kyu,Kim, Mijin,Kim, Won The Korean Society of Systematic Zoology 2013 Animal Systematics, Evolution and Diversity Vol.29 No.3
The stomatopods are aggressive predatory marine crustaceans, which are mainly found in tropical and subtropical regions. Among these, a parasquillid stomatopod, Faughnia formosae Manning and Chan, 1997, collected from Jeju Island, is reported for the first time in Korea. The family is easily distinguished from other families by the presence of an asymmetrically bilobed cornea, stout propodus on the raptorial claw, and three primary spines of the uropodal protopod. In the paper, detailed descriptions and illustrations of this species are provided alongside a photograph. A key to the species of Korean mantis shrimp is also presented. As a result of this study, four species of stomatopods including this species are now recorded in Korean fauna.
( Kyu Won Kwak ),( Hyung Joo Yoon ),( Youngcheol Choi ),( Kwanho Park ),( Jaesam Hwang ),( Hyunae Kim ),( Sunghee Nam ) 한국잠사학회 2013 International Journal of Industrial Entomology Vol.27 No.2
The purpose of this study was to quickly and effectively identify the Nosema disease of bumblebees in Gangwon Province in Korea. Bumblebees are crucial pollinators of various crops, and microsporidia are the critical pathogens of these hosts. When bumblebees are infected with Nosema bombi, their abdomens can become distended. Paralyzed and infected workers often become sluggish and die early. We have identified the morphology of the microsporidium by light and electron microscopy, and found it to have fairly small oval spores, as has been described previously in many other articles. For the specific and sensitive diagnosis of the microsporidian parasite N. bombi in bumblebees, we have developed an improved method of the polymerase chain reaction (PCR) for expeditious diagnosis. Two pairs of primers were tested on N. bombi and the related microsporidia Nosema apis and Nosema sp., both of which infect Bombus ignitus and Bombus hypocrita sapporoensis. Furthermore, we have verified and analyzed the 16SrRNA sequence data of N. bombi in bumblebees by using the Basic Local Alignment Search Tool (BLAST) server at the National Center for Biotechnology Information.
Development of Prediction Equation of Diffusing Capacity of Lung for Koreans
Hwang, Yong Il,Park, Yong Bum,Yoon, Hyoung Kyu,Lim, Seong Yong,Kim, Tae-Hyung,Park, Joo Hun,Lee, Won-Yeon,Park, Seong Ju,Lee, Sei Won,Kim, Woo Jin,Kim, Ki Uk,Shin, Kyeong Cheol,Kim, Do Jin,Kim, Hui Ju The Korean Academy of Tuberculosis and Respiratory 2018 Tuberculosis and Respiratory Diseases Vol.81 No.1
Background: The diffusing capacity of the lung is influenced by multiple factors such as age, sex, height, weight, ethnicity and smoking status. Although a prediction equation for the diffusing capacity of Korea was proposed in the mid-1980s, this equation is not used currently. The aim of this study was to develop a new prediction equation for the diffusing capacity for Koreans. Methods: Using the data of the Korean National Health and Nutrition Examination Survey, a total of 140 nonsmokers with normal chest X-rays were enrolled in this study. Results: Using linear regression analysis, a new predicting equation for diffusing capacity was developed. For men, the following new equations were developed: carbon monoxide diffusing capacity (DLco)=-10.4433-0.1434${\times}$age (year)+0.2482${\times}$heights (cm); DLco/alveolar volume (VA)=6.01507-0.02374${\times}$age (year)-0.00233${\times}$heights (cm). For women the prediction equations were described as followed: DLco=-12.8895-0.0532${\times}$age (year)+0.2145${\times}$heights (cm) and DLco/VA=7.69516-0.02219${\times}$age (year)-0.01377${\times}$heights (cm). All equations were internally validated by k-fold cross validation method. Conclusion: In this study, we developed new prediction equations for the diffusing capacity of the lungs of Koreans. A further study is needed to validate the new predicting equation for diffusing capacity.