• 제목/요약/키워드: Expression Strategies

검색결과 526건 처리시간 0.024초

방사선에 의한 간섬유증에서 헤지호그의 잠재적 역할 (Potential Role of Hedgehog Signaling in Radiation-induced Liver Fibrosis)

  • 왕시형;정영미
    • 생명과학회지
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    • 제23권5호
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    • pp.710-720
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    • 2013
  • 방사선 치료는 가장 일반적으로 사용되고 있는 항암치료로, 암 환자의 수 증가와 동반하여 방사선 활용도는 더욱 증가하고 있다. 방사선치료에 대한 환자들의 심리적 거부감과 산화적 스트레스, 저산소증, DNA 손상을 포함하여, 치료 후 나타나는 간 섬유화는 방사선 치료의 가장 큰 문제점으로 대두되고 있다. 간암의 경우 대부분의 환자들이 섬유화를 동반하고 있어서, 방사선에 의해 암세포가 제거된다 하더라도, 기존에 남아있는 손상 부위에서의 섬유화와 방사선 조사에 의한 정상조직의 섬유화는 간경변 유발 확률을 높이고 있다. 간 섬유화는 여러 간질환에서 흔히 관찰되는 증상으로, 간 섬유화 진행 기작의 규명은 만성질환으로의 진행을 억제할 수 있는 치료책 개발로 연계될 수 있지만, 아직까지 명확히 규명되지 않음에 따라, 섬유화를 억제할 수 있는 효과적인 방법이 없는 실정이다. 최근 간 섬유화 생성 및 진행에 대한 헤지호그의 역할이 밝혀지면서, 간암 및 만성질환으로의 진행을 이해하기 위한 연구대상으로 대두되고 있다. 헤지호그는 손상된 간에서 발현되어 보수과정에 기여하게 된다. 헤지호그의 발현은 간 손상 정도에 비례하여 발현되어, 간 줄기세포 및 간 성상세포의 증식을 조절한다. 또한, TGF-${\beta}1$와, EMT를 유도하고 근섬유화세포의 활성을 조절하여, 간 섬유화 진행에 중심적 역할을 한다. 방사선이 조사된 생쥐의 간에서도 헤지호그의 발현증가가 관찰되었고, 이에 따른 간 줄기세포의 증식 및 EMT 유도, 콜라겐의 축적이 관찰되었다. 또한, 방사선이 조사된 암컷 생쥐의 간에서 헤지호그의 차별적 증가는 줄기세포 및 섬유화 증대로 연결되었고, 이는 방사선 민감성에 대한 성별차이를 설명할 수 있는 생물학적 근거가 될 수 있다. 그러나, 방사선에 의해 유도된 간 섬유화에 대한 연구결과들이 헤지호그를 비롯하여, 표면적인 결과보고만 있을 뿐, 섬유화 진행에 대한 구체적 기작을 밝히지 못하고 있다. 여러 간 질환진행에서 규명된 헤지호그 작용에 대한 지식을 방사선에 의해 유도된 간 섬유화를 이해하기 위한 기초자료로 활용하고, 사람에서의 방사선 부작용과 유사한 동물모델의 정립 및 헤지호그 역할을 직접적으로 규명할 수 있는 추가적 연구을 통해서, 간 섬유화 형성 기작을 이해할 수 있는 연구결과가 기대된다.

한국인의 문화적 자기관과 감정표현불능증의 관계: 세대에 의해 조절된 정서표현양가성 및 정서억제 연속매개과정 모형 (The Relationship between Cultural Self-construal of Korean and Alexithymia: A Serial Mediation Process Model of Ambivalence over Emotion Expression and Emotion Suppression Moderated by Generation)

  • 김해진;권소영;정선호;이동훈
    • 한국심리학회지 : 문화 및 사회문제
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    • 제29권2호
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    • pp.171-197
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    • 2023
  • 전통적인 한국 사회는 동양의 집단주의 문화권으로 분류되어 왔지만, 1970년대 탈냉전과 더불어 세계화와 정보화의 흐름 속에 서양의 개인주의 문화와 가치가 젊은 층을 중심으로 한국 사회에 빠르게 스며들었다. 짧은 시기에 급변했기 때문에, 동시대를 살아가는 세대 간에 문화적 자기관의 차이가 있을 수 있으며, 이로 인해 감정표현 및 억제와 관련된 심리적 문제가 세대에 따라 다르게 나타날 수 있다. 따라서 본 연구에서는 20대에서 60대에 이르는 한국인 성인 남녀 1000명을 대상으로 개인의 문화적 자기관과 감정표현불능 수준, 그리고 정서표현양가성과 정서억제 수준을 조사하여, 상호협조적 자기관, 상호독립적 자기관 및 감정표현불능증의 관계, 그리고 그것을 매개하는 정서표현양가성 및 정서억제의 과정을 살펴보았다. 그리고 연구대상자의 출생연도를 기준으로 산업화 세대(1970년 이전 출생)와 정보화 세대(1970년 이후 출생)로 구분하고, 각 변인의 세대 차이와 정서표현양가성과 정서억제의 매개 과정에 대한 세대의 조절 효과를 검증하였다. Hayes(2022)의 PROCESS macro를 이용하여 분석한 결과, 첫째 문화적 자기관의 상대적 독립성(상호협조적 자기관에 비하여 상호독립적 자기관이 높은 정도를 계산한 값)이 정서표현양가성과 정서억제를 연속매개하여 감정표현불능증에 영향을 주는 연속매개모형이 유의하였다. 이는 개인의 상대적 독립성이 약할수록 정서표현양가성과 정서억제 수준이 순차적으로 높아져서 감정표현불능 수준이 높아짐을 의미한다. 다음으로 연속매개모형에서 세대의 조절효과를 탐색한 결과, 정서억제에서 감정표현불능증으로 가는 경로를 세대 변인이 조절하였다. 산업화 세대의 경우 정서억제 수준이 높아도 감정표현불능 수준이 높아지지 않는 반면, 정보화 세대는 정서억제 수준이 높을수록 감정표현불능증의 수준이 높아짐을 의미한다. 본 연구 결과는 세대의 문화적 가치관에 따라 정서조절방략이 다르게 형성되었을 가능성을 시사하며, 정서억제처럼 역기능적인 정서조절방략이라 할지라도 자신이 속한 세대의 문화적 배경에 따라 그것의 부정적인 영향력이 다를 수 있음을 함의한다.

8-60hIPP5m-Induced G2/M Cell Cycle Arrest Involves Activation of ATM/p53/p21cip1/waf1 Pathways and Delayed Cyclin B1 Nuclear Translocation

  • Zeng, Qi-Yan;Zeng, Lin-Jie;Huang, Yu;Huang, Yong-Qi;Zhu, Qi-Fang;Liao, Zhi-Hong
    • Asian Pacific Journal of Cancer Prevention
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    • 제15권9호
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    • pp.4101-4107
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    • 2014
  • Protein phosphatase 1 (PP1) is a major serine/threonine phosphatase that controls gene expression and cell cycle progression. The active mutant IPP5 ($8-60hIPP5^m$), the latest member of the inhibitory molecules for PP1, has been shown to inhibit the growth of human cervix carcinoma cells (HeLa). In order to elucidate the underlying mechanisms, the present study assessed overexpression of $8-60hIPP5^m$ in HeLa cells. Flow cytometric and biochemical analyses showed that overexpression of $8-60hIPP5^m$ induced G2/M-phase arrest, which was accompanied by the upregulation of cyclin B1 and phosphorylation of G2/M-phase proteins ATM, p53, $p21^{cip1/waf1}$ and Cdc2, suggesting that $8-60hIPP5^m$ induces G2/M arrest through activation of the ATM/p53/$p21^{cip1/waf1}$/Cdc2/cyclin B1 pathways. We further showed that overexpression of $8-60hIPP5^m$ led to delayed nuclear translocation of cyclin B1. $8-60hIPP5^m$ also could translocate to the nucleus in G2/M phase and interact with $pp1{\alpha}$ and Cdc2 as demonstrated by co-precipitation assay. Taken together, our data demonstrate a novel role for $8-60hIPP5^m$ in regulation of cell cycle in HeLa cells, possibly contributing to the development of new therapeutic strategies for cervix carcinoma.

Effects of nanoscale ridge/groovepattern arrayed surface on in vitro differentiation of multi-potent pulp cells derived from human supernumerary teeth

  • Kim, Daehwan;Jo, Hwansung;Lee, Jingu;Kim, Keesung;Roh, Sangho
    • International Journal of Oral Biology
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    • 제38권4호
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    • pp.161-167
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    • 2013
  • Human dental pulp stem cells (DPSCs) are multi-potent mesenchymal stem cells that have several differentiation potentials. An understanding of thetissues that differentiate from these cells can provide insights for future regenerative therapeutics and tissue engineering strategies. The mesiodens is the most frequent form of supernumerary tooth from which DPSCs can differentiate into several lineages similar to cells from normal deciduous teeth. Recently, it has been shown that nanoscale structures can affect stem cell differentiation. In our presentstudy, we investigated the effects of a 250-nm nanoscale ridge/groove pattern array on the osteogenic and adipogenic differentiation of dental pulp cells from mesiodenscontaining human DPSCs. To this end, the expression of lineage specific markers after differentiation induction was analyzed by lineage specific staining and RT-PCR. The nanoscale pattern arrayed surface showed apositive effect on the adipogenic differentiation of DPSCs. There was no difference between nanoscale pattern arrayed surface and conventional surface groups onosteogenic differentiation. In conclusion, the nanoscale ridge/groove pattern arrayed surface can be used to enhance the adipogenic differentiation of DPSCs derived from mesiodens. This finding provides an improved understanding of the effects of topography on cell differentiation as well as the potential use of supernumerary tooth in regenerative dental medicine.

구강 편평상피세포암에서 상피성장인자 수용체와 혈관내피성장인자 수용체 타이로신 활성화효소의 동시 억제 (CONCOMITANT INHIBITION OF EPIDERMAL GROWTH FACTOR AND VASCULAR ENDOTHELIAL GROWTH FACTOR RECEPTOR TYROSINE KINASES IN ORAL SQUAMOUS CELL CARCINOMA)

  • 박영욱;이상신
    • Maxillofacial Plastic and Reconstructive Surgery
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    • 제28권3호
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    • pp.193-201
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    • 2006
  • Squamous cell carcinoma(SCC) of head and neck(SCCHN) is the sixth most common human malignant tumor. However, despite advances in prevention and treatment of SCC, the five-year survival rates for patients remain still low. To improve the outcome for patients with SCCHN, novel treatment strategies are needed. Overexpression of the epidermal growth factor(EGF) and activation of its receptor(EGFR) are associated with progressive growth of SCCHN. Vascular endothelial growth factor(VEGF) signaling molecules are related with neoangiogenesis and vascular metastasis of SCC. In this study, we determined the therapeutic effect of AEE788(Novartis Pharma AG, Basel, Switzerland), which is a dual inhibitor of EGFR/ErbB2 and VEGFR tyrosine kinases, on human oral SCC. At first, we screened the expression of EGFR, c-ErbB2(HER-2) and VEGFR-2 in a series of human oral SCC cell lines. And then we evaluated the effects of AEE788 on the phosphorylation of EGFR and VEGFR-2 in a oral SCC cell line expressing EGFR/HER-2 and VEGFR-2. We also evaluated the effects of AEE788 alone, or with paclitaxel(Taxol) on the oral SCC cell growth and apoptosis. As a result, all oral SCC cells expressed EGFR and VEGFR-2. Treatment of oral SCC cells with AEE788 led to dose-dependent inhibition of EGFR and VEGFR-2 phosphorylation, growth inhibition, and induction of apoptosis. Moreover, AEE788 sensitizes the cells to paclitaxel-mediated toxicity and apoptosis. These data mean EGFR and VEGFR-2 can be reliable targets for molecular therapy of oral SCC, and therefore warrant clinical use of EGFR/VEGFR inhibition in the treatment of patients with recurrent or metastatic oral SCC.

Upregulation of HIF-1α by Hypoxia Protect Neuroblastoma Cells from Apoptosis by Promoting Survivin Expression

  • Zhang, Bo;Yin, Cui-Ping;Zhao, Qian;Yue, Shou-Wei
    • Asian Pacific Journal of Cancer Prevention
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    • 제15권19호
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    • pp.8251-8257
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    • 2014
  • Apoptosis is one of main types of neural cell death and is reversible and is a major target of therapeutic interventions. However, detailed apoptotic cascades still need to be recognized. In present study, we determined the promotion of HIF-$1{\alpha}$ and survivin in brain samples of a mouse model of hypoxic-ischemia and in neuroblastoma SH-SY5Y cells post hypoxia treatment. Then gain-of-function and loss-of-function strategies were adopted to manipulate the HIF-$1{\alpha}$ in SH-SY5Y cells, and hypoxia-induced survivin upregulation and cell apoptosis were determined. Results demonstrated that the HIF-$1{\alpha}$ and survivin were significantly promoted in a mouse model of hypoxic-ischemia or in SH-SY5Y cells post hypoxia in vitro. Manually upregulated HIF-$1{\alpha}$ could promote the hypoxia-induced survivin upregulation and improve the hypoxia-induced SH-SY5Y cell apoptosis. On the other hand, the HIF-$1{\alpha}$ knockdown by RNAi reduced the hypoxia-induced survivin upregulation and cell apoptosis. Therefore, the present study confirmed the protective role of HIF-$1{\alpha}$ and survivin in the hypoxia-induced SH-SY5Y cell apoptosis, and the survivin upregulation by hypoxia is HIF-$1{\alpha}$-dependent. Promotion of HIF-$1{\alpha}$ and survivin might be a valuable stragegy for therapeutic intervention for hypoxic-ischemic encephalopathy.

한국과 뉴질랜드 초등학교 저학년의 덧셈과 뺄셈 지도방법에 관한 고찰 (A Note on Teaching Method of Addition and Subtraction between Korea and New Zealand Primary School)

  • 최창우
    • East Asian mathematical journal
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    • 제31권4호
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    • pp.505-525
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    • 2015
  • The purpose of this study is to analyze teaching method of addition and subtraction of whole number in Korea and New Zealand lower grade textbook and to get some suggestive points to develop mathematics curriculum and for a qualitative improvement of textbook. To do this, we will analyze focusing on teaching material, type and method of teaching, cases of real teaching and in the case of New Zealand, we will analyze portfolios together to see what kind of things do they deal with related to addition and subtraction. From these analyzing, the results are as follows: First, the guideline of accomplishment of group of year are stated in 2009 revised curriculum in Korea but it is rough. On the other hand, the level of accomplishment from kindergarten to high school are stated divided by eight kinds of thing in New Zealand curriculum. Second, there were common and different points in the aspect of teaching material. The common points are that both of our Korea and New Zealand are using materials related to real life intimately and the diifferent points are to use technology such as calculator and computer. They are more widely used in New Zealand than our Korea. Third, Korea had used routine method mainly but New Zealand had used method to develop creativity of learner such as to write problem corresponding to expression, posing problem corresponding to information, to complete table and find pattern and to write word problem to explain pattern and so on. Fourth, we could see special calculation strategies in the case of teaching addition and subtraction such as concept of double, compensation, various strategy based on counting of number, addition of the same number, magic square, near-double which are not finding in our mathematics textbook. Fifth, in the New Zealand textbook they had used teaching methods inducing curiosity of learner such as finding message and puzzle problem than solving given problem simply.

시각정보 메타데이터를 이용한 축산 심벌 표현에 대한 연구 (A Study on Livestock Symbol Representation Using Visual Information Metadata)

  • 김곡미
    • 문화기술의 융합
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    • 제4권2호
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    • pp.191-196
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    • 2018
  • 최근 소비자의 취향이 다양해지고 소비패턴이 변화하며 상품 포장디자인이 점차 발전한다는 것을 체감할 수 있다. 상품 포장디자인은 내용물을 정확하게 알 수 있게 만들어져야 하고 소비자의 눈길을 끌어 상품을 구매하고 싶도록 만드는 매력을 가지고 있어야 한다. 또한 상품디자인은 소비자들에게 시각적 효과를 유도한 그래픽 요소와 더불어 브랜드 네이밍, 패키지 레이아웃, 내용물 표현방법, 맛을 상상할 수 있는 색감 등에 따라 구매의욕을 일으켜야 한다. 상품의 포장디자인에서 내용물에 대한 이미지를 한 눈에 알 수 있게 표현한 그래픽 요소는 상품의 부가가치를 높이고 소비자의 구매동기 유발이나 유통의 합리화를 이루는 가장 핵심적인 요소라 할 수 있다. 본 연구는 축산상품에서 시각정보 메타데이터를 이용한 시각정보 심벌 이미지에 대한 연구이며 다양한 축산 포장에 대한 사례를 살펴보고 메타데이터 요소로 축산 이미지를 한 눈에 알 수 있게 표현한 그래픽 요소를 제시하여 축산상품에 활용하고자 한다. 축산 상품의 프리미엄화를 추구하고, 브랜드 가치를 높이며 차별화된 디자인 전략으로 경제적 효과와 더불어 축산 시장 활성화를 위한 가능성을 제시하고자 한다.

Molecular Analysis of Archaea, Bacteria and Eucarya Communities in the Rumen - Review-

  • White, B.A.;Cann, I.K.O.;Kocherginskaya, S.A.;Aminov, R.I.;Thill, L.A.;Mackie, R.I.;Onodera, R.
    • Asian-Australasian Journal of Animal Sciences
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    • 제12권1호
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    • pp.129-138
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    • 1999
  • If rumen bacteria can be manipulated to utilize nutrients (i.e., ammonia and plant cell wall carbohydrates) more completely and efficiently, the need for protein supplementation can be reduced or eliminated and the digestion of fiber in forage or agricultural residue-based diets could be enhanced. However, these approaches require a complete and accurate description of the rumen community, as well as methods for the rapid and accurate detection of microbial density, diversity, phylogeny, and gene expression. Molecular ecology techniques based on small subunit (SSU) rRNA sequences, nucleic acid probes and the polymerase chain reaction (PCR) can potentially provide a complete description of the microbial ecology of the rumen of ruminant animals. The development of these molecular tools will result in greater insights into community structure and activity of gut microbial ecosystems in relation to functional interactions between different bacteria, spatial and temporal relationships between different microorganisms and between microorganisms and reed panicles. Molecular approaches based on SSU rRNA serve to evaluate the presence of specific sequences in the community and provide a link between knowledge obtained from pure cultures and the microbial populations they represent in the rumen. The successful development and application of these methods promises to provide opportunities to link distribution and identity of gastrointestinal microbes in their natural environment with their genetic potential and in situ activities. The use of approaches for assessing pupulation dynamics as well as for assessing community functionality will result in an increased understanding and a complete description of the gastrointestinal communities of production animals fed under different dietary regimes, and lead to new strategies for improving animal growth.

Assessment of Genetic Diversity in Different Populations of Raily Ecorace of Indian Tasar Silkworm, Antheraea Mylitta Drury Using ISSR Markers

  • Srivastava, Ashok Kumar;Kar, Prasanta Kumar;Sinha, Ravibhushan;Sinha, Manoj Kumar;Vijayaprakash, Nanjappa Basavappa
    • International Journal of Industrial Entomology and Biomaterials
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    • 제19권2호
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    • pp.249-253
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    • 2009
  • Raily ecorace of Indian tasar silkworm is wild in nature and distributed abundantly in dense deciduous forest on Shorea robusta (Sal) in Bastar ($17^{\circ}4'$ and $20^{\circ}34'$ N, $80^{\circ}15'$ and $82^{\circ}15'$ E and altitude ranging from 150 to 1200 mMSL) forest ranges of Chhattisgarh, India. It is represented by about 20 populations. Out of those, eleven populations showed intra- as well as inter- population variability based on phenotypic expression and also in major economic traits viz. cocoon weight, shell weight, filament length and denier. Genetic diversity in these eleven populations was studied using Inter-Simple Sequence Repeat (ISSR) markers. The band profiles generated with eight ISSR primers have depicted variation in band size. All the primers exhibited polymorphism which is an indicative of the genetic variation in individual Raily silkworm. Among the populations, total polymorphism recorded was 76%. The population genetic aspects assessed through POPGENE software package are discussed in the paper. Nei's gene diversity (h) ranged from 0.194 to 0.337 exhibiting high heterozygosity. Relevance of the present study is of high significance in formulating conservation strategies and sustainable utilization of the economically important Raily ecorace of Antheraea mylitta.