• 제목/요약/키워드: Functional characterization

검색결과 793건 처리시간 0.033초

Functional Characterization of ABCB4 Mutations Found in Low Phospholipid-Associated Cholelithiasis (LPAC)

  • Kim, Tae Hee;Park, Hyo Jin;Choi, Ji Ha
    • The Korean Journal of Physiology and Pharmacology
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    • 제17권6호
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    • pp.525-530
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    • 2013
  • Multidrug resistance 3 (MDR3) is expressed on the canalicular membrane of the hepatocytes and plays an important role in protecting the liver from bile acids. Altered ABCB4 gene expression can lead to a rare hepatic disease, low phospholipid-associated cholelithiasis (LPAC). In this study, we characterized 3 ABCB4 mutations in LPAC patients using various in vitro assay systems. We first measured the ability of each mutant to transport paclitaxel and then the mechanisms by which these mutations might change MDR3 transport activity were determined using immunoblotting, cell surface protein biotinylation, and immunofluorescence. Through a membrane vesicular transport assay, we observed that the uptake of paclitaxel was significantly reduced in membrane vesicles expressing 2 ABCB4 mutations, F165I and S320F. Both mutants showed significantly decreased total and cell surface MDR3 expression. These data suggest two missense mutations of ABCB4 may alter function of MDR3 and ultimately can be determined as LPAC-causing mutations.

사과 '히로사키' 캘러스 추출물의 기능성 화장품 소재로서의 특성 (Functional Characterization of Callus Extracts of Apple 'Hirosaki' for Cosmetic Materials)

  • 고승희;김영수;이진혁;김일현;김승범;노경백;신승우;정은선;박덕훈
    • KSBB Journal
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    • 제28권4호
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    • pp.244-248
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    • 2013
  • In order to investigate functional characterization of callus extracts of apple 'Hirosaki' for cosmetic materials, biological activities of its extracts including wrinkle improvement, hair growth, and anti-inflammatory effect were investigated. The callus extract showed similar activity with TGF-${\beta}$ used as positive control at 50 ${\mu}g/mL$ in the test of collagen synthesis, and increased 40% of proliferation of hair follicle dermal papilla cells. Especially, in case of anti-inflammatory effect, callus extract inhibited about 50% of COX-2 expression which was known as response for intermediating inflammation, and about 70% of eotaxin-1 production which was increased by atopy dermatitis.

Functional Genomics Approach Using Mice

  • Sung, Young-Hoon;Song, Jae-Whan;Lee, Han-Woong
    • BMB Reports
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    • 제37권1호
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    • pp.122-132
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    • 2004
  • The rapid development and characterization of the mouse genome sequence, coupled with comparative sequence analysis of human, has been paralleled by a reinforced enthusiasm for mouse functional genomics. The way to uncover the in vivo function of genes is to analyze the phenotypes of the mutant animals. From this standpoint, the mouse is a suitable and valuable model organism in the studies of functional genomics. Therefore, there have been enormous efforts to enrich the list of the mutant mice. Such a trend emphasizes the random mutagenesis, including ENU mutagenesis and gene-trap mutagenesis, to obtain a large stock of mutant mice. However, since various mutant alleles are needed to precisely characterize the role of a gene in vivo, mutations should be designed. The simplicity and utility of transgenic technology can satisfy this demand. The combination of RNA interference with transgenic technology will provide more opportunities for researchers. Nevertheless, gene targeting can solely define the in vivo function of a gene without a doubt. Thus, transgenesis and gene targeting will be the major strategies in the field of functional genomics.

실리카 나노입자 충진 폴리에틸렌 나프탈레이트의 특성 (Characterization of silica nano-particle filled poly (ethylene 2,6-naphthalate))

  • Ahn, Seon-Hoon;Kim, Seong-Hun;Im, Seung-Soon;Lee, Seung-Goo
    • 한국섬유공학회:학술대회논문집
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    • 한국섬유공학회 2003년도 봄 학술발표회 논문집
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    • pp.52-55
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    • 2003
  • Poly (ethylene 2, 6-naphthalate) (PEN) has been used for a high performance engineering plastics such as fiber, film, and packaging, because of excellent physical properties and outstanding gas barrier characteristics [1-2]. However, the application of PEN is limited because PEN exhibits a relatively high melt viscosity. Recently, many researches for organic/inorganic composites by applying nano-particles to the polymer matrix have been carried out [3], and the nano-particles exhibited greatly improved mechanical and rheological properties [4]. (omitted)

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