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- 저자 : SEKHONSIMRANJEET SINGH (검색결과 5 건)
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Bioengineered aptamer-nanoconjugates for cancer theragnosis
SEKHONSIMRANJEET SINGH,안근아,Satpal Singh Sekhon,Ji-Young Ahn,Yang-Hoon Kim 대한독성 유전단백체 학회 2018 Molecular & cellular toxicology Vol.14 No.4
Early detection and treatment of cancer is of global interest as cancer is one of the leading causes of death worldwide. As the survival rate of cancer patients is closely related to its detection at an early stage, there is an urgent need to develop detection techniques that are fast, reliable, and easily available. Aptamers are single stranded DNA- and RNA- based oligonucleotides that can bind to their targets with high affinity and specificity. Their small size, excellent chemical stability, and low immunogenicity enable them to become alternatives to antibodies in cancer theragnostic approaches with cancer imaging and therapy applications. Purpose of review: In this review, we discuss the role of aptamer-nanomaterials conjugates as novel molecular tools for enhanced diagnosis (biosensing and nano-imaging) and therapy (drug delivery) of cancer cells.
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The pine wood nematode Bursaphelenchus xylophilus and molecular diagnostic methods
이진표,SEKHONSIMRANJEET SINGH,김지훈,김선창,조병관,안지영,김양훈 대한독성 유전단백체 학회 2021 Molecular & cellular toxicology Vol.17 No.1
Background Bursaphelenchus xylophilus, commonly known as the pine wood nematode (PWN), is one of the most destructive nematode species. It causes pine wilt, a slow progressive disease that results in economic loss worldwide. Objective Here, we review the nematode detection methods, including morphological, molecular, chemical, and protein-based methods, and assess how the nematode’s distribution, virulence, incidence, and severity may be attenuated. Results Pathogenicity of the pine wood nematode is determined via its morphological and molecular characteristics. Many studies have used nucleic acid PCR amplification as a molecular-based technique, but there are often problems with DNA isolation. Currently, molecular-, chemical-, and protein-based analysis methods are used to diagnose emerging pine wilt diseases. Conclusion It is important to quickly diagnose and treat symptomatic trees, but the asymptomatic trees also require quick diagnosis and removal. For this reason, morphological- and DNA-based methods should be combined with chemical- and protein-based approaches for quick and efficient detection.
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김영창,김양훈,반연희,안지영,SEKHONSIMRANJEET SINGH,조성진 한국유전학회 2016 Genes & Genomics Vol.38 No.5
Sphingomonas chungbukensis DJ77 is a novel aromatic hydrocarbon-degrading bacterium capable of growing on phenanthrene as its sole source of carbon and energy. In this study, the protein expression profiles of S. chungbukensis DJ77 grown in the presence of phenanthrene were investigated by using two-dimensional gel electrophoresis (2-DE). Among 1000 protein spots visualized by 2-DE, the four proteins (i.e. 4-oxalocrotonate decarboxylase, 2-hydroxy-6-oxo-phenylhexa-2,4-dienoate hydrolase, glutathione S-transferase, and 2,3-dihydroxybiphenyl 1,2-dioxygenase) showing the significant upregulation by phenanthrene were identified by reversed-phase liquid chromatography–tandem mass spectrometry. Evidently, these proteins were involved in the metabolism of aromatic hydrocarbons. This can explain why S. chungbukensis DJ77 shows a significantly higher rate of phenanthrene consumption during the degradation process. The present analysis of proteomic responses and the detailed analysis results will be quite helpful to better understand the global physiology of S. chungbukensis DJ77, as proteome databases for various aromatic hydrocarbon- degrading strains have already been established.
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Lysosome-related organelles extracts from egg-white for hypermelanosis reduction
윤지희,오민주,안지영,SEKHONSIMRANJEET SINGH,김양훈,민지호 대한독성 유전단백체 학회 2016 Molecular & cellular toxicology Vol.12 No.2
Pigmentary disorders generally indicate that an increased amount of melanin, leading to darker color of skin, called hypermelanosis. Thus, several methods were studied for finding therapy of hypermelanosis until now in worldwide. In this study, the hypermelanosis reduction has been observed with daily lysosome-related organelles (LRO) extract from eggwhite. The scrub was used for enzyme extraction so as to maintain the stability of the extracted enzyme. The LRO extracts were divided and into two groups: free enzyme and fresh enzyme. Free enzyme was extracted on the first day from the LRO and fresh enzyme was extracted by scrub from LRO daily. The melanin dissolved phosphate buffer (pH 7.0) was treated by two groups of enzymes for a period of 30 days. The fresh enzymes were found to be more effective than the free enzymes. The activity of free enzymes decreases with time and as a result it could not degrade melanin after 36 days. The peroxidase activity was also measured and it matched with the results of previous studies. Therefore, the daily fresh enzymes displayed remarkable ability in hypermelanosis reduction than with free enzyme that lost its activity after some time. The present work can be potentially used for dermal disease in medical industry and also in cosmetic products.
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Woo‑Ri Shin,Mun‑Jong Lee,SEKHONSIMRANJEET SINGH,Ji Hun Kim,Sun Chang Kim,Byung‑Kwan Cho,Ji‑Young Ahn,Yang‑Hoon Kim 대한독성 유전단백체 학회 2020 Molecular & cellular toxicology Vol.16 No.3
Background Development of genetically modified crops has rapidly increased in last few years. The most widely grown GM crops express genes that confer herbicide tolerance and insect resistance. Detection system of GM crops is important for safety evaluation before its consumption. Objective The purpose of this research is to detect GM crops, especially PAT, in food-samples. Results The bar gene (PAT protein, herbicide resistant) was cloned in pGEX-4T-1 and expressed by E. coli. The high-affinity PAT-specific single-stranded DNA (ssDNA) aptamers were obtained from a random DNA library. MOE docking study was performed to identify the potential binding region of the selected aptamers on PAT. Aptamer-linked immobilized sorbent assay (ALISA) method was used to detect PAT. Conclusion We screened aptamer against PAT for developing an efficient detection method. The selected PAT specific aptamers, HRPA-05 and HRPA-07, showed the distinct target binding behaviors, and detected PAT protein by aptamer-linked immobilized sorbent assay method with high efficiency and selectivity.
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