• 대한약학회:학술대회논문집
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• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.1
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• pp.199.1-199.1
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• 2002

• Archives of Pharmacal Research
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• 제22권5호
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• pp.507-514
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• 1999

6-(1-azidoalkyl)-DMNQ derivatives compared to 2-(1-azidoalkyl)-DMNQ isomers, exhibited higher cytotoxic activity against L1210 mouse leukemia cells and stronger inhibition of DNA topoisomerase-I (TOPO-I), suggesting involvement of steric hindrance. However, similar antitumor activity against mice bearing S-180 cell was shown by 2-an 6-(1-azidoalkyl)-DMNQ derivatives.

• 약학회지
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• 제46권5호
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• pp.295-300
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• 2002

To observe the structure-activity relationship of lupane derivatives both on cytotoxic and antiangiogenic activity, twelve lupane derivatives were prepared; their antiangiogenic and cytotoxic activities were evaluated. Among them, four compounds were more cytotoxic than betulinic acid. Carboxylic acid at C28 seemed to be essential for cytotoxic activity. But, a selective cytotoxicity toward SK-MEL-2 was not observed. As for antiangiogenic activity, none of the compounds except lupeol showed antiangiogenic activity at 30 $\mu\textrm{g}$/mL.

• Bulletin of the Korean Chemical Society
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• 제20권9호
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• pp.1073-1077
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• 1999

CRAMP, a 37-amino acid cationic antimicrobial peptide was recently deduced from the cDNA cloned from mouse femoral marrow RNA. In order to investigate the structure-activity relationship and functional region of CRAMP, CRAMP and its 18-mer overlapping peptides were synthesized by the solid phase method. CRAMP showed broad spectrum antibacterial activity against both Gram-positive and Gram-negative bacterial strains (MIC: 3.125-6.25 μM) but had no hemolytic activity until 50 μM. CRAMP was found to have a potent anticancer activity (IC50: 12-23 μM) against two human small cell lung cancer cell lines. Furthermore, CRAMP was found to display faster bactericidal rate in B. subtilis rather than E. coli in the kinetics of bacterial killing. Among 18-meric overlapping fragment peptides, only CRAMP (16-33) displayed potent antibacterial activity (MIC: 12.5-50 μM) against several bacteria with no hemolytic activity. Circular dichroism (CD) spectra anal-ysis indicated that CRAMP and its analogues will form the amphipathic α-helical conformation in the cell membranes similar to other antimicrobial peptides, such as cecropins and magainins.

• 한국식품과학회지
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• 제51권4호
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• pp.336-342
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• 2019

참당귀 유래 면역활성 다당의 활성과 구조의 상관관계를 규명하고자 조다당 AGE-0로부터 두 차례의 연속적인 컬럼 크로마토그래피를 실행하여 단일 정제 다당 AGE-2c-I을 얻었다. AGE-2c-I은 농도의존적으로 우수한 항보체 활성을 보여주었으며, 일반화학적 특성을 분석한 결과, 분자량 약 140 kDa의 고분자 다당으로 4종의 구성당과 13종의 당쇄 결합양식으로 구성되어 있음을 확인할 수 있었다. 이 다당은 ${\beta}$-glucosyl Yariv reagent와의 높은 반응성을 보임으로써 arabino-3,6-galactan의 구조를 가진 rhamnogalacturonan-I 구조임을 추정할 수 있었다. 한편, AGE-2c-I의 미세구조의 해명과 항보체 활성에 관여하는 다당 중의 활성부위 검토를 위해 ${\alpha}$-L-arabinofuranosidase와 endo-1,4-${\beta}$-galactanase를 이용한 연속적 가수분해를 행하고 얻은 단편획분들을 이용, 구성당 및 당쇄결합 양식 분석, ${\beta}$-glucosyl Yariv reagent와의 반응성 검토 및 항보체 활성 결과를 분석한 결과, 참당귀 유래 항보체활성 다당 AGE-2c-I은 rhamnogalacturonan-I과 유사한 구조를 소유하고 있음이 확인되었으며, AGE-2c-I의 측쇄 구조인 arabino-${\beta}$-3,6-galactan 사슬이 항보체 활성 발현에 주요 역할을 수행하며, 5-linked Araf와 3,5-branched Araf로 구성된 ${\alpha}$-arabinan 측쇄가 활성에 부분적으로 관여하고 있음을 최종 확인할 수 있었다.

• 한국환경성돌연변이발암원학회지
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• 제21권2호
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• pp.113-117
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• 2001

The screening of various molecular descriptors for predicting carcinogenic, mutagenic and teratogenic activities of chlorinated aliphatic compounds as drinking water disinfection byproducts (DBPs) has been investigated for the application of quantitative structure-activity relationships (QSAR). The present work embodies the study of relationship between molecular descriptors and toxicity parameters of the genotoxicity endpoints for the screening of relevant molecular descriptors. The toxicity Indices for 29 compounds constituting the testing set were computed by the PASS program and active values were chosen. We investigate feasibility of screening descriptors and of their applications among different genotoxic endpoints. The correlation to teratogenicity of all 29 compounds was significantly improved when the same analysis was done with 20 alkanes only without alkene compounds. The HOMO (highest occupied molecular orbital) energy and number of Cl parameters were dominantly contributed.

• 한국콘텐츠학회논문지
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• 제7권10호
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• pp.115-125
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• 2007

본고는 유저 활동의 중요성, 유저간의 소통의 중요성, 플레이어 캐릭터의 성장과 변형을 통한 정체성 확립의 중요성을 중심으로 가상공간 커뮤니케이션의 특성을 분석하고, 이를 통해 원만한 사회관계를 활성화하고자 그 방안을 모색하고 유저들이 가상 사회 안에서 보다 책임 있는 행동을 유발하도록 제안하였다. 하루에도 수 천 명이 접속하여 교류하는 가상 공간에서 유저는 솔로스토리를 진행하며 타인과의 인간 관계를 통해 자신의 정체성을 찾게 된다. 무엇보다도 중요한 것은 가상 공간을 사회로 인식하고 타인에 대한 언행에 대해 연대 책임 의식을 갖는 유저들의 자세일 것이다.

• Environmental Analysis Health and Toxicology
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• 제24권2호
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• pp.79-93
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• 2009

오염물질에 대한 생태위해성평가(ecological risk assessment)를 위해서는 노출평가(exposure assessment)와 함께 생물영향에 대한 평가(effect assessment)를 수행해야 한다. 노출평가의 경우는 지화학적 과정에 대한 이해를 바탕으로 환경농도를 예측하기 위한 화학평형모델이나 다매체환경거동모델 등 다양한 평가 및 예측모델을 활용해 왔다. 이와 달리 생물영향평가는 실험실 조건에서 제한된 독성자료를 대상으로 외부노출농도에 기반한 농도-반응관계를 통계적 방법을 통해서 추정하는 '경험적 모델(empirical model)'에 주로 의존해 왔다. 최근에 와서 생체 내 잔류량을 기반으로 농도-시간-반응관계를 기술하고 예측하는 독성동태학 및 독성역학 모델(toxicokinetic-toxicodynamic model)과 같은 독성작용에 기반한 모델(processbased model)들이 개발되어 활용되고 있다. 본 논문에서는 여러 종류의 독성동태학 및 독성역학 모델을 소개하고, 이를 통계적 추론에 기반한 전통적인 독성학 모델과 비교하였다. 서로 다른 종류의 독성동태학 및 독성역학 모델로부터 도출된 노출농도-시간 -반응관계식을 비교하고, 동일 독성기작을 보이는 오염물질 그룹 내에서 미측정 오염물질의 독성을 예측할 수 있게 해주는 구조-활성관계(Quantitative Structure-Activity Relationship, QSAR) 모델을 여러 독성동태 및 독성역학모델로부터 유도하였다. 마지막으로 독성동태학 및 독성역학 파라미터를 추정하기 위한 실험계획을 제안하였고, 앞으로 독성동태학 및 독성역학 모델을 생태계 위해성평가에 활용하기 위해서 해결해야 될 연구과제를 검토하였다.

• Biomolecules & Therapeutics
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• 제17권1호
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• pp.79-85
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• 2009

Polyphenolic compounds are reported to have various pharmacological activities such as anti-oxidative, anti-cancerous, anti-inflammatory and anti-aging effects. Although numerous papers explore their functional roles in many different cellular actions, not many studies handle their structural features in anti-inflammatory responses. In this study, therefore, we examined structural role of substituted transstilbenes in their NO inhibitory and NF-${\kappa}B$ suppressive activities. Of 10 compounds tested, 4 compounds (cinnamic acid, resveratrol, piceatannol and curcumin) displayed NO inhibitory activities in a dose-dependent manner. Similarly, these compounds blocked LPS-induced cytotoxicity of RAW264.7 cells. All NO inhibitory compounds also inhibited $I{\kappa}B{\alpha}$ phosphorylation, a hallmark for NF-${\kappa}B$ activation. However, these inhibitory compounds exhibited distinct suppressive pattern in tumor necrosis factor (TNF)-${\alpha}$- or phorbol-12-myristate-13-acetate (PMA)-induced NF-${\kappa}B$ and AP-1 activation. According to structure-activity relationship study, polarity and size of ring B seem to be important for diminishing NO production. Therefore, our data suggest that substituted trans-stilbenes can be developed as novel anti-inflammatory drug or further developed as lead compounds for another improvement.

• Bulletin of the Korean Chemical Society
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• 제34권4호
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• pp.1212-1220
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• 2013

The human coagulation factor XI (FXI) is a serine protease that plays a significant role in blocking of the blood coagulation cascade as an attractive antithrombotic target. Selective inhibition of FXIa (an activated form of factor XI) disrupts the intrinsic coagulation pathway without affecting the extrinsic pathway or other coagulation factors such as FXa, FIIa, FVIIa. Furthermore, targeting the FXIa might significantly reduce the bleeding side effects and improve the safety index. This paper reports on a docking-based three dimensional quantitative structure activity relationship (3D-QSAR) study of the potent FXIa inhibitors, the chloro-phenyl tetrazole scaffold series, using comparative molecular field analysis (CoMFA) and comparative molecular similarity analysis (CoMSIA) methods. Due to the characterization of FXIa binding site, we classified the alignment of the known FXIa inhibitors into two groups according to the docked pose: S1-S2-S4 and S1-S1'-S2'. Consequently, highly predictive 3D-QSAR models of our result will provide insight for designing new potent FXIa inhibitors.