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Park, Young ,Ran,Seo, Seung ,Young,Kim, Se ,Lim,Zhu, Shi ,Mao,Chun, Sungkun,Oh, Jung-Mi,Lee, Min ,Ro,Kim, Seong ,Hun,Kim, In ,Hee,Lee, Seung ,Ok,Lee, Soo ,Teik,Kim, Portland Press Ltd. 2018 Bioscience reports Vol.38 No.5
<P>MiRNA (miR)-206 plays a tumor suppressor role in various cancer types. Here, we investigated whether miR-206 is involved in prostaglandin E2 (PGE2)-induced epithelial–mesenchymal transition (EMT) in colorectal cancer (CRC) cells through the targetting of transmembrane 4 L six family member 1 (TM4SF1).</P><P>The effect of PGE2 on growth and apoptosis of CRC cells was evaluated using the MTT assay and flow cytometry analysis, respectively. TM4SF1 and miR-206 expression levels were determined with quantitative polymerase chain reaction (qRT-PCR) in CRC tissues and cell lines. The concentration of PGE2 in the serum of CRC patients and healthy controls was measured with an ELISA kit. A miR-206 or TM4SF1 construct was transfected into cells with PGE2. Transwell migration and invasion assays were used to examine cell migration and invasion properties. Additionally, a luciferase assay was performed to determine whether TM4SF1 was directly targetted by miR-206.</P><P>We found that miR-206 was down-regulated and TM4SF1 was up-regulated in human CRC tissues and cell lines. Moreover, miR-206 was negatively correlated with TM4SF1 expression. Bioinformatics analysis and a luciferase reporter assay revealed that miR-206 directly targetted the 3′-untranslated region (UTR) of TM4SF1, and TM4SF1 expression was reduced by miR-206 overexpression at both the mRNA and protein levels. Additionally, PGE2 significantly suppressed the expression of miR-206 and increased the expression of TM4SF1 in CRC cells. PGE2 induction led to enhanced CRC cell proliferation, migration, and invasion. Moreover, the overexpression of miR-206 decreased CRC cell proliferation, migration, and invasion compared with control group in PGE2-induced cells, and these effects could be recovered by the overexpression of TM4SF1. Overexpression of miR-206 also suppressed the expression of β-catenin, VEGF, MMP-9, Snail, and Vimentin and enhanced E-cadherin expression in PGE2-induced cells. These results could be reversed by the overexpression of TM4SF1. At last, up-regulation of miR-206 suppressed expression of <I>p</I>-AKT and <I>p</I>-ERK by targetting TM4SF1 in PGE2-induced cells.</P><P>Our results provide further evidence that miR-206 has a protective effect on PGE2-induced colon carcinogenesis.</P>
축격손상을 받은 의사등방성 탄소섬유강화 복합재의 굽힘피로강도
박수철(Soo-Chul Park ),박설현(Seol-Hyeon Park ),정종안(Jong-An Jung),차천석(Cheon-Seok Cha ),양용준(Yong-Jun Yang) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.10
CFRP는 금속에 비해 가벼우면서 강도 및 강성과 내열성 등 기계적 특성이 매우 뛰어나 다양한 분야에서 사용되어지고 있으며 최근 우주항공 분야에 까지 사용되어지고 있지만 외부 충격하중으로 인하여 내부에 발생되는 손상에 대해서는 매우 취약한 단점을 보이고 있다. 본 연구는 외부 충격을 받은 CFRP 적층판의 내부 충격손상에 대해 반복적인 사용에 따른 파괴에 이르기까지의 강도를 고찰함으로써 우주항공 분야에 사용되는 항공기 외판의 설계를 위한 설계 데이터를 확보하기 위한 실험적 연구이다. 실험 방법으로는 적층구성을 달리하여 제작된 의사등방형 CFRP 시험편과 직교이방성 CFRP 시험편에 대해 직경 5mm의 강구를 충돌시킴으로써 발생하는 충격손상을 관찰한 후 3점 굽힘피로실험을 통하여 내부 층간분리 및 충격손상의 진전을 관찰하였다. 시험편 내부의 파괴가 발생하기 까지 굼힘피로실험에 따른 굽힘피로강도를 고찰한 결과 강구에 의해 충격을 받은 면이 인장을 받는 경우와 충격을 받는 경우 모두 의사등방성 적층구성의 강도가 높게 나타남을 알 수 있었다. Compared to metal, CFRP has excellent mechanical characteristics in terms of intensity, hardness, and heat resistance as well as its light weight that it is used widely in various fields. Therefore, this material has beenused recently in the aerospace field. On the other hand, the material has shortcomings in terms of its extreme vulnerability todamage occurring internally from an external impact. This study examinedthe intensity up to itsdestruction from repeated use with the internal impact of aCFRP laminated plate that hadalso been exposed to external impact obtain design data for the external plate of aircraft used in the aerospace field. For the experimental method, regarding the quasi-isotopic type CFRP specimen and orthotropic CFRP specimen that are produced with a different layer structure, steel spheres with adiameter of 5mm werecillided to observe the resulting impact damage. Through a3-point flexural fatigue experiment, the progress of internal layer separation and impact damage qasobseved. Measurements of the flexural fatigue strength afterthe flexural fatigue experiment until internal damage occus and the surface impacted by the steel spheres revealed the quasui-istopic layer structure to have ahigher intensity for both cases.
Thu, Huong Phung ,Thi,Nguyen, Tuan Anh,Munashingha, Palinda Ruvan,Kwon, Buki,Dao ,Van, Quy,Seo, Yeon-Soo Oxford University Press 2015 Nucleic acids research Vol.43 No.3
<P>Fen1 and Mus81–Mms4 are endonucleases involved in the processing of various DNA structural intermediates, and they were shown to have genetic and functional interactions with each other. Here, we show the <I>in vivo</I> significance of the interactions between Mus81 and Rad27 (yeast Fen1). The N-terminal 120 amino-acid (aa) region of Mus81, although entirely dispensable for its catalytic activity, was essential for the abilities of Mus81 to bind to and be stimulated by Rad27. In the absence of <I>SGS1</I>, the <I>mus81</I><SUB>Δ120N</SUB> mutation lacking the N-terminal 120 aa region exhibited synthetic lethality, and the lethality was rescued by deletion of <I>RAD52</I>, a key homologous recombination mediator. These findings, together with the fact that Sgs1 constitutes a redundant pathway with Mus81–Mms4, indicate that the N-terminus-mediated interaction of Mus81 with Rad27 is physiologically important in resolving toxic recombination intermediates. Mutagenic analyses of the N-terminal region identified two distinct motifs, named N21–26 (aa from 21–26) and N108–114 (aa from 108–114) important for the <I>in vitro</I> and <I>in vivo</I> functions of Mus81. Our findings indicate that the N-terminal region of Mus81 acts as a landing pad to interact with Rad27 and that Mus81 and Rad27 work conjointly for efficient removal of various aberrant DNA structures.</P>