• 대한방사성의약품학회지
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• 제8권2호
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• pp.77-85
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• 2022

The Td05 and Sgc8c, DNA-based aptamers, are well-known to target internalized surface markers (IGHM and PTK7) of Burkitt's lymphoma and acute lymphoblastic leukemia (ALL). Thus, Td05 and Sgc8c labeled with metallic radioisotope ⁶⁴Cu can be evaluated as potential diagnostic PET imaging agents. In this study, we modified the carbon chain length of the last adenosine of aptamer (n = 3, 6, 12) to increase tumor cell uptake and select the best candidate among six types of aptamer analogues and one adenosine of aptamer. After labeling of ⁶⁴Cu, [⁶⁴Cu]Cu-DOTA-aptamer analogues were evaluated in vitro studies (serum stability, Log P values, cell uptake, biodistribution). Then, we evaluate in vivo PET imaging study for two candidates (⁶⁴Cu-DOTA-C12-Sgc8c, ⁶⁴Cu-DOTA-C6-Td05). PET images clearly visualize tumors at 24 h post-injection rather than at an early time point and the tumor-to-background ratio also increases at the delay time point. ⁶⁴Cu-DOTA-C12-Sgc8c and ⁶⁴Cu-DOTA-C6-Td05 could be used as potential radiotracers for lymphoma.

• KSBB Journal
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• 제26권4호
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• pp.352-356
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• 2011

The detection of biomarkers is an important issue for disease diagnosis. However, many systems are not suitable to detect the biomarker itself directly. For direct detection of biomarker proteins in human serum, a new affinity-capture method using aptamers combined with the mass spectrometry was suggested. Since signals from protein samples cannot be amplified, modified chromatin immunoprecipitation (ChIP) and subsequent cross-linking with formaldehyde between aptamers and target proteins were used not to lose the captured target proteins, which allowed us to perform a harsh washing step to remove the non-specifically bound proteins. As a model system, a thrombin aptamer was used as a bait and thrombin as a target protein. Using our modified ChIP and affinity-capture method, non-specific binding proteins on the beads decreased significantly, suggesting that our new method is efficient and can be applied to developing diagnosis systems for various biomarkers.

• Molecular & Cellular Toxicology
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• 제4권2호
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• pp.100-105
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• 2008

Biochips are a powerful emerging technology for biomedical, environmental applications. Especially, making use of bioseonors in the evaluation of toxicity becomes increasingly important. For biosensor as a toxicity detection, biomolecules like antibodies or aptamers have been developed to specifically capture the toxic target molecules. In addition, the development of optimal chip materials capable of maintaining the activity of embedded biomolecules such as proteins or aptamers has proven challenging. Here, using sol-gel materials, new chip material, whose ability for immobilizing the embedded aptamers and maintaining the ability of embedded aptamers is optimal, was searched. We used sol-gel formulation screening methods previously developed and found the best formulation which shows high sensitive and specific interactions of aptamers. This study results will support the technological advancement for diagnosis and environmental sensor.

• Bulletin of the Korean Chemical Society
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• 제31권12호
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• pp.3561-3566
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• 2010

Interleukin 32 (IL-32) is a recently identified cytokine that induces major proinflammatory cytokines such as $TNF{\alpha}$ and IL-$1{\beta}$, which play an important role in chronic inflammatory diseases. To antagonize the biological function of IL-32 in cells, we generated RNA aptamers that could bind specifically to IL-32 protein. The highest affinity aptamer, AC3-3, successfully antagonized IL-32 by abolishing the induction of $TNF{\alpha}$ in the human lung carcinoma cells expressing IL-32. This aptamer could be used as a potent and selective antagonist against IL-32 to further elucidate the roles of IL-32 in chronic inflammatory diseases, as well as a therapeutic agent.

• Journal of Dairy Science and Biotechnology
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• 제38권4호
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• pp.169-188
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• 2020

Salmonella spp. is the most common cause of gastrointestinal food poisoning worldwide, and human salmonellosis is mostly caused by the consumption of contaminated food. Therefore, the development of rapid detection methods for Salmoenlla spp. and rapid identification of the source of infection by subtyping are important for the surveillance and monitoring of food-borne salmonellosis. Therefore, this review introduces (1) History and nomenclature of Salmoenlla spp., (2) Epidemiology of Salmoenlla spp., (3) Detection methods for Salmoenlla spp. - conventional culture method, genetic detection method, molecular detection methods, and aptamer, and (4) Subtyping methods for Salmoenlla spp. - pulsed-field gel electrophoresis and repetitive sequence-based polymerase chain reaction (PCR).

• 미생물학회지
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• 제43권3호
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• pp.159-165
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• 2007

C형 간염바이러스(hepatitis C virus; HCV)증식을 효과적이며 특이적으로 제어할 수 있는 유전산물을 개발하기 위하여 HCV 중식조절이자인 NS5B RNA replicase 존재에 의해 allosteric하게 그 활성 이 조절될 수 있는 HCV internal ribosome entry site (IRES) 표적 hammerhead 리보자임을 개발하였다. 우선 HCV IRES 염기서열 중+382 nucleotide(nt) 부위가 리보자임에 의해 가장 잘 인식되었음을 관찰하였다. 이러한 allosteric 리보자임은 NS5B RNA replicase와 특이적으로 결합하는 RNA aptamer 부위, aptamer와 NS5B와의 결합에 의해 리보자임 활성을 유도할 수 있도록 구조적 변이를 전달할 수 있는 communication module부위 및 HCV IRES의 +382 nt를 인지하는 hammerhead 리보자임 등으로 구성되도록 설계하였다. 특히 in vitro selection기법을 활용하여 NS5B 의존적으로 리보자임 활성을 증가시킬 수 있는 communication module 염기서열을 밝혀내었다. 이러한 리보자임은 단백질이 없거나 대조 단백질인 bovine serum albumin이 존재할 때에는 절단반응을 유도하지 못하였으나 HCV NS5B 단백질이 존재할 매에만 효과적으로 NS5B 농도 의존적으로 절단 반응을 유도할 수 있음을 관찰하였다. 이러한 allosteric 리보자임은 HCV중식의 효과적인 증식 억제 선도물질 뿐만 아니라 HCV 치료선도물질의 스크리닝용 도구 및 HCV 조절 인자를 탐색할 수 있는 HCV 진단용 리간드로서도 활용될 수 있을 것이다.

• 한국유전체학회:학술대회논문집
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• 한국유전체학회 2006년도 The 15th Korean Genome Organization Conference KOGO 2006 Annual Meeting
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• pp.66-66
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• 2006

• Bulletin of the Korean Chemical Society
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• 제33권8호
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• pp.2796-2798
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• 2012

• Molecular & Cellular Toxicology
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• 제3권sup4호
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• pp.33.1-33.1
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• 2007

• Safe Food
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• 제2권4호
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• pp.5-10
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• 2007