• 제목/요약/키워드: protein microarray

검색결과 349건 처리시간 0.026초

ER membrane protein complex subunit 6 (EMC6) is a novel tumor suppressor in gastric cancer

  • Wang, Xiaokun;Xia, Yan;Xu, Chentong;Lin, Xin;Xue, Peng;Zhu, Shijie;Bai, Yun;Chen, Yingyu
    • BMB Reports
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    • 제50권8호
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    • pp.411-416
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    • 2017
  • The endoplasmic reticulum (ER) membrane protein complex subunit 6 (EMC6) is a novel human autophagy-related molecule. Here, using tissue microarray and immunohistochemistry, we report that EMC6 protein is lost or reduced in glandular cells of patients with gastric adenocarcinoma, compared to normal stomach mucosa. Overexpression of EMC6 in gastric cancer cells inhibited cell growth, migration, invasion, and induced apoptosis and cell cycle arrest at S-phase. Further investigation suggested that EMC6 overexpression in BGC823 human adenocarcinoma gastric cancer cells reduced tumorigenicity in a xenograft model, demonstrating that EMC6 has the characteristics of a tumor suppressor. This is the first study to show that EMC6 induces cell death in gastric cancer cells. The molecular mechanism of how EMC6 functions as a tumor suppressor needs to be further explored.

Lycopersicon Eculentum C2H2-type Zinc Finger Protein Induced by Oxidative Stress Especially

  • Seong, Eun-Soo;Lee, Ji-Yeon;Yu, Chang-Yeon;Yang, Deok-Chun;Eom, Seok-Hyun;Cho, Dong-Ha
    • Journal of Plant Biotechnology
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    • 제34권3호
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    • pp.167-172
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    • 2007
  • A tomato zinc-finger protein gene, LeZFP1, encoding the Cys2/His2-type zinc-finger transcription factor was searched from cDNA microarray analysis of gene expression following induction of the overexpressed tomato transgenic plants showing resistance for pathogen and abiotic stresses. The full-length cDNA of LeZFP1 encoded a protein of 261 amino acid residues. Analysis of the deduced amino acid sequence of LeZFP1 revealed that it shares high sequence identity with pepper CAZFP1 (81% identity). We found that single copy of LeZFP1 gene is present in the tomato genome through southern blot analysis. The LeZFP1 transcripts were constitutively expressed in the tomato mature and young leaves, but were detectable weakly in the flower, stem and root. The LeZFP1 transcripts were significantly reduced in treated leaf tissues with NaCl and mannitol. The LeZFP1 gene was induced by oxidative stress especially. Our results indicated that LeZFP1 may play a role function involved in oxidative stress signaling pathways.

Integrated Bioinformatics Approach Reveals Crosstalk Between Tumor Stroma and Peripheral Blood Mononuclear Cells in Breast Cancer

  • He, Lang;Wang, Dan;Wei, Na;Guo, Zheng
    • Asian Pacific Journal of Cancer Prevention
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    • 제17권3호
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    • pp.1003-1008
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    • 2016
  • Breast cancer is now the leading cause of cancer death in women worldwide. Cancer progression is driven not only by cancer cell intrinsic alterations and interactions with tumor microenvironment, but also by systemic effects. Integration of multiple profiling data may provide insights into the underlying molecular mechanisms of complex systemic processes. We performed a bioinformatic analysis of two public available microarray datasets for breast tumor stroma and peripheral blood mononuclear cells, featuring integrated transcriptomics data, protein-protein interactions (PPIs) and protein subcellular localization, to identify genes and biological pathways that contribute to dialogue between tumor stroma and the peripheral circulation. Genes of the integrin family as well as CXCR4 proved to be hub nodes of the crosstalk network and may play an important role in response to stroma-derived chemoattractants. This study pointed to potential for development of therapeutic strategies that target systemic signals travelling through the circulation and interdict tumor cell recruitment.

Inactivation of SMAD$_4$ Tumor Suppressor gene during Gastric Cancer Progression

  • Shin, Young-Kee
    • 한국독성학회:학술대회논문집
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    • 한국독성학회 2006년도 추계학술대회
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    • pp.19-24
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    • 2006
  • Mothers against decapentaplegic homolog 4 (SMAD4) is a tumor suppressor gene associated with gastrointestinal carcinogenesis. The aim of the present study was to characterize more precisely its role in the development and progression of human gastric carcinoma. In this study, using tissue microarray analysis of 283 gastric cancers and related lesions, we found loss of SMAD4 protein expression in the cytoplasm (36/114, 32%) and in the nucleus (46/114, 40%) of gastric cancer cells. The loss of nuclear SMAD4 expression in primary tumors correlated significantly with poor survival, and was an independent prognostic marker in multivariate analysis. We also found a substantial decrease in SMAD4 expression at both the RNA and protein level in several human gastric carcinoma cell lines. To identify the genetic and/or epigenetic mechanisms of altered SMAD4 expression in gastric carcinoma, loss of heterozygosity (LOH), promoter hypermethylation, and exon mutations were examined. We found that LOH (20/70, 29%) and promoter hypermethylation (4/73, 5%) were associated with the loss of SMAD4 expression. SMAD4 protein levels wore also affected in certain gastric carcinoma cell lines following incubation with Mc132, a proteasome inhibitor. Taken together, our results indicate that the loss of SMAD4, especially loss of nuclear SMAD4 expression, is involved in gastric cancer progression. The loss of SMAD4 in gastric carcinomas is due to several mechanisms, including LOH, hypermethylation, and proteasome degradation.

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육미지황탕가미방이 흰쥐의 기억능력과 중추신경계 유전자 발현에 미치는 영향 (Effect on Gene Expression Profile of Rat Hippocampus Caused by Administration of Memory Enhancing Herbal Extract)

  • 최보업;배현수;신민규;홍무창
    • 동의생리병리학회지
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    • 제16권5호
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    • pp.1025-1034
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    • 2002
  • The herbal extract (YMT_02) is a modified herbal extracts from Yukmijihwang-tang (YMJ) to promote memory-enhancing. The YMJ extracts has been widely used as an anti-aging herbal medicine for hundred years in Asian countries. The purpose of this study is to; 1) quantitatively evaluate the memory-enhancing effect of YMT_02 by behavior task, 2) identify candidate genes responsible for enhancing memory by cDNA microarray and 3) assess the anti-oxidant effect of YMT_02 on PC12 cell. Memory retention abilities are addressed by passive avoidance task with Sprague-Dawley (SD) male rat. Before the training session, the rats are subdivided into four groups and administrated with YMT_02, Ginkgo biloba, Soya lecithin and normal saline for 10 days. The retention test was performed. 24 hours after the training session. The retention time of the YMT_02 group was significantly (p<0.05) delayed (~100%), whereas Ginkgo biloba and Soya lecithin treatment delayed 20% and 10% respectively. The hippocampi of YMT_02 and control group were dissected and mANA was further purified. After synthesizing cDNA using oligo-dT primer, the cDNA were applied to Incyte rat GEMTM 2 cDNA microarray. The microarray results show that prealbumin(transthyretin), phosphotidylethanolamine N-methyltransferase, and PEP-19 are expressed abundantly in the YMT_02 treated group. Especially, PEP-19 is a neuron-specific protein, which inhibits apoptotic processes in neuronal cell. On the other hand, transcripts of RAB15, glutamate receptor subunit 2 and CDK108 are abundant in control group. Besides, neuronal genes involved in neuronal death or neurodegeneration such as neuronal-pentraxin and spectrin are abundantly expressed in control group. Additionally, the YMT_02 shows an anti oxidative effect in the PC12 cell. The list of differentially expressed genes may implicate further insight on the action and mechanism behind the memory-enhancing effect of herbal extracts YMT_02, for example, anti-apoptotic, anti-oxidative, and neuroprotective effects.

난소낭종 및 자궁내막염 한우에서 염증유래 유전자 발굴 (Identification of Inflammation-related Genes Altered in the Cystic Ovary and Endometritis of Korean Cattle)

  • 최창용;박선영;김은숙;문윤자;박혜진;손동수;조상래;김현종;김재범;박재용;홍성근;한재희;강다원
    • 한국수정란이식학회지
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    • 제23권3호
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    • pp.211-216
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    • 2008
  • This study was carried out to investigate inflammation-related gene expression altered in ovary and endometrium of Korean cattle with reproductive disorders using microarray. In the present study, nine inflammation-related differential1y expressed genes (DEGs) were identified in the cystic ovary and endometrium with endometritis. In the follicular cyst, eotaxin and alpha-2-HS-glycoprotein (AHSG) were up-regulated, whereas complement component 3 (C3) and oxidised low density lipoprotein (lectin-like) receptor 1 (OLR1) were down-regulated. Complement component 4A (C4A) was up-regulated in luteal cyst. In the endometritis, chemokine 1igand l and 2 (CXCL1 and CXCL2), protein C (inactivator of coagulation factors Va and VIIIa), and complement component C5 were up-regulated, whereas kininogen was down-regulated. Of these genes, we focused on eotaxin and kininogen, which were highly regulated in the follicular cyst and endometritis, respectively and on C3 commonly regulated in both reproductive disorders. The microarray data of eotaxin, kininogen, and C3 were validated by semi-quantitative PCR. Consistent with microarray data, eotaxin was up-regulated by 4-fold in the follicular cyst, while kininogen was down-regulated by 5-fold in the endometritis. C3 was down-regulated in the both follicular cyst and endometritis. Our results suggest that these inflammation-related genes could be useful markers for diagnosis of cystic ovary and endometritis of Korean cattle.

쥐L6 근원세포에서 miR-128의 근육세포 분화와 인슐린신호에서의 역할 (Roles of miR-128 in Myogenic Differentiation and Insulin Signaling in Rat L6 Myoblasts)

  • 오명주;김소현;김지현;전병학
    • 생명과학회지
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    • 제30권9호
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    • pp.772-782
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    • 2020
  • 골격근의 분화 또는 근육 분화는 근육량과 신진대사 항상성을 유지하기 위해 중요하다. 근육 특이적 microRNAs (miRNAs)는 골격근 분화에 중요한 역할을 한다. 본 연구에서는 rat miRNAs 마이크로어레이를 사용하여 rat L6 근아세포의 근육 분화 과정에서의 miRNAs 발현 양상을 조사했다. 우리는 miR-128의 발현 증가를 발견했고, 동시에 이미 알려진 근육 분화 조절 miRNAs인 miR-1, miR-133b와 mi-206의 발현 증가를 확인했다. 이 microarray 결과를 확인하기위해 우리는 Quantitative RT-PCR 기술을 사용하였고, microarray 결과와 유사하게 발현 초기 mRNAs와 발현 후 성숙 miRNAs에서 모두 miR-128의 발현 증가를 확인했다. 또한 Rat L6 근아세포로의 miR-128 발현 향상은 muscle creatine kinase (MCK), myogenin, myosin heavy chain (MHC)와 같은 근육분화 표지 유전자 발현을 유발했고, 또한 MHC의 단백질 발현을 증가시켰다. 억제 PNAs를 사용한 miR-128의 작용 억제는 이러한 근육 분화 표지 유전자들의 발현을 차단했다. 또한, miR-128 발현 향상은 Erk와 Akt 단백질의 인슐린 자극에 의한 인산화를 증가시켰고, 고인슐린혈증과 고혈당증으로 인해 유도된 인슐린 저항성으로 인한 Erk와 Akt의 억제된 인산화를 회복했다. 이러한 발견은 miR-128이 근육분화와 인슐린 작용에 중요한 역할을 할 수 있다는 것을 시사한다.

배추에서 신규 염 저항성 관련 유전자 분리 및 검정 (Isolation and Identification of a New Gene Related to Salt Tolerance in Chinese Cabbage)

  • 유재경;박영두
    • 원예과학기술지
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    • 제31권6호
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    • pp.748-755
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    • 2013
  • 본 연구는 배추에서 염 저항성 관련 유전자를 발굴하기 위해 수행되었다. 우선 염처리(250mM NaCl)된 순계배추 'Chiifu'를 이용한 KBGP-24K oligo chip 데이터[BrEMD(B. rapa EST and microarray database)]를 분석하였다. 그 결과, 염처리 시 크게 반응하는 202개의 unigene들을 1차 선발하였고, 이들 중 기능이 정확히 알려지지 않았으나 완전장을 갖추고 있는 1개의 유전자를 최종선발하여 BrSSR(B. rapa salt sensitive resistance)로 명명하였다. BrSSR은 94개의 아미노산으로 번역되는 총 285bp의 오픈리딩프레임을 가지고 있으며, DUF581 도메인을 지니고 있다. 염 저항성을 분석하기 위하여 BrSSR이 과발현된 pSL94 vector를 제작하여 담배에 형질전환시켰다. BrSSR이 과발현된 $T_1$ 세대 담배 형질전환체들은 PCR과 DNA blot 분석에 의해 선발하였다. Quantitative real-time RT PCR 분석 결과, 형질 전환된 담배에서 BrSSR의 발현이 대조군 보다 약 3.8배까지 높게 발현되었다. 이는 RNA blot 분석 결과와도 일치했다. 또한 표현형 분석에서 5일간 250mM NaCl 염 처리 후 BrSSR이 과발현된 형질전환체들이 대조군보다 우수한 염 저항성을 보여 주었다. 위 결과들에 근거하여 염 스트레스 환경 하에서 BrSSR 유전자의 과발현은 식물의 염 저항성을 향상과 매우 밀접한 관계가 있는 것으로 판단된다.

Caffeic acid phenethyl ester의 처리에 의한 NSAID activated gene-1의 과대발현 (Over-expression of NSAID Activated Gene-1 by Caffeic Acid Phenethyl Ester)

  • 장민정;김효은;손성민;김민정;서을원;김영호;김종식
    • 생명과학회지
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    • 제19권12호
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    • pp.1787-1793
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    • 2009
  • 파이토케미칼의 일종인 CAPE가 암세포 생장에 미치는 영향과 유전자 발현을 연구하기 위하여, 인간 대장암 세포주 HCT116에 CAPE를 처리하였다. CAPE의 처리는 농도 의존적으로 암 세포 생존율을 감소시키고, 세포사멸을 유도함을 확인하였다. CAPE에 의해 차별적으로 발현되는 유전자를 분석하기 위하여, oligo DNA microarray 실험을 수행하였다. 그 결과, $20{\mu}M$ CAPE를 24시간 동안 처리한 경우, 2배 이상 발현이 증가되는 유전자 266개, 2배 이상 발현이 감소되는 유전자 143개를 확인하였다. 발현이 증가되는 유전자중 3개(NAG-1, p21, GADD45A)를 선택하여, RT-PCR을 수행하였다. 그 결과, 모든 유전자의 발현이 마이크로어레이 실험결과와 일치하였다. 또한, CAPE를 농도 의존적으로 처리한 후, NAG-1 유전자와 단백질의 발현을 확인한 결과, mRNA 수준과 단백질 수준에서의 발현양상이 동일함을 확인하였다. 게다가, CAPE를 포함한 5개의 다른 종류의 파이토케미칼(resveratrol, genistein, daidzein, capsaicin)을 처리한 경우, 처리한 모든 파이토케미칼에 의해 NAG-1 유전자의 발현이 증가됨을 확인하였다. 이중 CAPE가 가장 낮은 농도의 처리임에도 불구하고 NAG-1의 발현을 가장 강하게 유도하였다. 결론적으로 이러한 연구결과는 CAPE에 의한 세포사멸은 항암유전자인 NAG-1의 과대발현과 밀접한 관련이 있음을 의미한다.

마늘성분 Allicin에 의해 차별적으로 발현되는 유전자군의 발현 분석 (Analysis of Differentially Expressed Genes by Allicin in Human Colorectal Cancer Cell)

  • 김경호;김민정;김종식;표석능;김병오
    • 한국미생물·생명공학회지
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    • 제38권4호
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    • pp.442-447
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    • 2010
  • 본 연구에서는 마늘성분 allicin에 의한 항암 기전 및 화학적 암 예방법의 분자 생물학적 기전을 이해하기 위한 연구의 일환으로, 마늘성분 중의 하나인 allicin이 인체 대장암 세포주 HCT116의 증식에 미치는 영향을 확인하였다. allicin의 처리에 따라 세포사멸이 나타나며 생존율이 감소함을 확인하였다. 또한 oligo DNA microarray 실험을 통하여 allicin에 의해 발현되는 유전자 중 발현양의 차이를 보인 유전자중 2배 이상 up-regulation된 유전자는 7,840개, 2배 이상 down-regulation 된 유전자는 10,010개로 각각 분류 되었다. 이 중, ATF3유전자의 발현을 확인하였고, 또 다른 항암유전자인 NAG-1 유전자의 발현을 RT-PCR로 확인하였다. 그 결과, allicin처리에 의해 항암유전자인 ATF3의 발현과 NAG1 유전자의 발현이 증가함을 확인하였다. 또한 p53 HCT116 세포주를 이용하여 allicin에 의한 NAG1 단백질의 발현을 확인한 결과, allicin은 p53 유전자 의존적으로 NAG-1 단백질을 발현함을 확인하였다. 결론적으로 allicin은 세포주기나 세포사멸에 관련된 많은 유전자들의 발현 변화를 유도함으로써 암세포 성장억제 활성을 갖는 것으로 사료된다.