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TC1(C8orf4) is a novel endothelial inflammatory regulator enhancing NF-kappaB activity.
Kim, Jungtae,Kim, Yunlim,Kim, Hyun-Taek,Kim, Dong Wook,Ha, Yunhi,Kim, Jihun,Kim, Cheol-Hee,Lee, Inchul,Song, Kyuyoung Williams Wilkins 2009 JOURNAL OF IMMUNOLOGY Vol.183 No.6
<P>Endothelial inflammation is regulated by a complex molecular mechanism. TC1(C8orf4) is a novel regulator implicated in cancer and inflammation. It is a small protein conserved well among vertebrates. In zebrafish embryos, it is mostly expressed in angio-hematopoietic system and the overexpression induces edema. In human aortic endothelial cells and umbilical vein endothelial cells, TC1 transfection up-regulates key inflammatory cytokines, enzymes, and adhesion proteins including IL-6, IL-1alpha, COX-2, CXCL1, CCL5, CCL2, IL-8, ICAM1, VCAM1, and E-selectin, while TC1 knockdown down-regulates them. TC1 also enhances inflammatory parameters such as monocyte-endothelial adhesion and endothelial monolayer permeability. TC1 is up-regulated by IL-1beta, TNF-alpha, LPS, and phorbol ester, and the up-regulation is inhibited by I-kappaB-kinase inhibitors. TC1, in turn, enhances the nuclear translocation of RelA and the DNA binding activity, suggesting a biological role of amplifying NF-kappaB signaling via a positive feedback. Our findings suggest that TC1 is a novel endothelial inflammatory regulator that might be implicated in inflammatory vascular diseases.</P>
Kim, Jungtae(김정태) 언어과학회 2015 언어과학연구 Vol.0 No.75
In a Korean context, Self-Directed Learning(SDL) in English language learning is essential, but there is little literature regarding the relationship between SDL and English speaking ability. This study investigated the relationship between Korean college learners` SDL capability and their English speaking proficiency, in particular, the mean difference among the learners` English speaking test scores according to their SDL ability, the effects of gender and study abroad experience on the speaking scores across the SDL levels, and the characteristics of the relationship between the two factors. 90 Korean English language learners 9(ELLs) participated in the study by taking a computerized English speaking test and responding to an SDL survey followed by focal group interviews. The research findings showed that the learners` SDL ability might not be a powerful indicator of their English speaking proficiency; the mean difference of the speaking scores across the SDL groups was significantly different; the effect of study abroad experience was significant across the SDL groups while the gender effect was not. In addition, there was the ELLs` conceptual misunderstanding of the SDL and speaking ability, and their lack of speaking practices. Some suggestions are discussed in terms of improving the ELLs` SDL and English speaking ability.
Kim, Youngmi,Kim, Jungtae,Park, Juhee,Bang, Seunghyun,Jung, Yusun,Choe, Jongseon,Song, Kyuyoung,Lee, Inchul Elsevier 2006 FEBS letters Vol.580 No.14
<P><B>Abstract</B></P><P>Follicular dendritic cells (FDC) play crucial roles in immune regulation. TNF-α has been shown to be essential to the FDC network. However, the molecular regulation of FDC proliferation has not been characterized. Here, we show that TC1(C8orf4), a novel positive regulator of the Wnt/β-catenin pathway in vertebrates, is upregulated by IL-1β and TNF-α in the human FDC-like line HK. TC1 enhances HK cell proliferation, while TC1-knockdown inhibits the proliferation induced by IL-1β, suggesting a role of TC1 as a regulator of FDC proliferation. The regulation by pro-inflammatory cytokines suggests that TC1 might be implicated in linking local inflammation to immune response by stimulating FDC.</P>
Fast Capturing on Micromagnetic Cell Sorter
Jungtae Kim,Hyeck-Hee Lee,Steinfeld, U.,Seidel, H. IEEE 2009 IEEE SENSORS JOURNAL Vol.9 No.8
<P>A new micro immune-magnetophoretic cell sorter (micro IMP cell sorter) has been developed to isolate T lymphocytes from biological suspensions such as whole blood. By using two permanent magnets, the developed micro IMP cell sorter is designed to isolate target cells continuously and automatically without a preliminary labeling process which is often acting as a bottleneck in automated microcell sorters. By using the capture probability analysis and the binding kinetic analysis, fast capturing of the target cells was achieved in the straight microfluidic channel between the magnets within 20 s of flow time. Multiphysical simulations including fluidic and electromagnetic models were carried out describing the trajectory of the magnetic particle, also. The fabricated microcell sorter was tested for sorting of CD3+ T lymphocytes with Dynabead CD3 from a mixture of T lymphocytes and erythrocytes.</P>
Exploring the Effects of Multimedia-based Self-directed English Speaking Practice
( Jungtae Kim ),( Young Woo Cho ),( Yong Ju Lee ) 한국멀티미디어언어교육학회 2014 멀티미디어 언어교육 Vol.17 No.4
This study explored the effects of multimedia-based self-directed speaking practice for English learning at a university setting in Korea. Forty-three undergraduate students participated in a semester-long self-directed English speaking practice program. This study took a blended learning approach in which learners practiced English speaking personally using a computer program outside the classroom, and then worked on some communicative activities in the classroom based on their personal practice effort. The results showed that only 17 out of 43 learners (39.54%) successfully moved up to a higher level of English speaking ability as a result of self-directed speaking practice. Three variables were tested for their possible association with speaking ability improvement: practice quantity, practice quality, and learner quality. Two-by-two Chi-square analyses revealed that none of the variables was significantly associated with speaking level improvement. though there were more learners who improved their speaking ability in the high groups. Finally, survey data indicated that learners perceived the program and their experience as positive, yet responded that their actual participation level was relatively low. A key implication is that self-directed speaking practice requires sophisticated training and coaching to create adequate motivation and readiness for independent learning.