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Kim, J.H.,Choi, B.H.,Lim, H.T.,Park, E.W.,Lee, S.H.,Seo, B.Y.,Cho, I.C.,Lee, J.G.,Oh, S.J.,Jeon, J.T. Asian Australasian Association of Animal Productio 2005 Animal Bioscience Vol.18 No.12
This study deals with the characterization of porcine PIK3C3 and association tests with quantitative traits. PIK3C3 belongs to the class 3 PI3Ks that participate in the regulation of hepatic glucose output, glycogen synthase, and antilipolysis in typical insulin target cells such as those in the such as liver, muscle system, and fat. On the analysis of full-length mRNA sequence, the length of the PIK3C3 CDS was recorded as 2,664 bps. As well, nucleotide and amino acid identities between human and pig subjects were 92% and 99%, respectively. Five SNPs were detected over 5 exons. We performed genotyping by using a SNP C2604T on exon24 for 145 F$_2$ animals (from a cross between Korean native boars and Landrace sows) by PCR-RFLP analysis with Hpy8I used to investigate the relationship between growth and fat depot traits. In the total association analysis, which doesn' consider transmission disequilibrium, the SNP showed a significant effect (p<0.05) on body weight and carcass fat at 30 weeks of age as well as a highly significant effect (p<0.01) on back fat. In an additional sib-pair analysis, C allele still showed positive and significant effects (p<0.05) on back fat thickness and carcass fat. Moreover, the effects of C allele on the means of within-family components for carcass fat and back fat were estimated as 2.76 kg and 5.07 mm, respectively. As a result, the SNP of porcine PIK3C3 discovered in this study could be utilized as a possible genetic marker for the selection of pigs that possess low levels of back fat and carcass fat at the slaughter weight.
Intravesical Instillation of c-MYC Inhibitor KSI-3716 Suppresses Orthotopic Bladder Tumor Growth
Jeong, K.C.,Kim, K.T.,Seo, H.H.,Shin, S.P.,Ahn, K.O.,Ji, M.J.,Park, W.S.,Kim, I.H.,Lee, S.J.,Seo, H.K. Williams and Wilkins Co 2014 The Journal of urology Vol.191 No.2
Purpose: c-MYC is a promising target for cancer therapy but its use is restricted by unwanted, devastating side effects. We explored whether intravesical instillation of the c-MYC inhibitor KSI-3716 could suppress tumor growth in murine orthotopic bladder xenografts. Materials and Methods: The small molecule KSI-3716, which blocks c-MYC/MAX binding to target gene promoters, was used as an intravesical chemotherapy agent. KSI-3716 action was assessed by electrophoretic mobility shift assay, chromatin immunoprecipitation, transcription reporter assay and quantitative reverse transcriptase-polymerase chain reaction. Inhibition of cell proliferation and its mechanism was monitored by cell cytotoxicity assay, EdU incorporation assay and flow cytometry. The in vivo efficacy of KSI-3716 was examined by noninvasive luminescence imaging and histological analysis after intravesical instillation of KSI-3716 in murine orthotopic bladder xenografts. Results: KSI-3716 blocked c-MYC/MAX from forming a complex with target gene promoters. c-MYC mediated transcriptional activity was inhibited by KSI-3716 at concentrations as low as 1 μM. The expression of c-MYC target genes, such as cyclin D2, CDK4 and hTERT, was markedly decreased. KSI-3716 exerted cytotoxic effects on bladder cancer cells by inducing cell cycle arrest and apoptosis. Intravesical instillation of KSI-3716 at a dose of 5 mg/kg significantly suppressed tumor growth with minimal systemic toxicity. Conclusions: The c-MYC inhibitor KSI-3716 could be developed as an effective intravesical chemotherapy agent for bladder cancer.
Jung, W.Y.,Yu, S.L.,Seo, D.W.,Jung, K.C.,Cho, I.C.,Lim, H.T.,Jin, D.I.,Lee, Jun-Heon Asian Australasian Association of Animal Productio 2012 Animal Bioscience Vol.25 No.10
Pigs may need to be exploited as xenotransplantation donors due to the shortage of human organs, tissues and cells. Porcine endogenous retroviruses (PERVs) are a significant obstacle to xenotransplantation because they can infect human cells in vitro and have the potential for transmission of unexpected pathogens to humans. In this research, 101 pigs, including four commercial breeds (23 Berkshire, 13 Duroc, 22 Landrace and 14 Yorkshire pigs), one native breed (19 Korean native pigs) and one miniature breed (10 NIH miniature pigs) were used to investigate insertional variations for 11 PERV loci (three PERV-A, six PERV-B and two PERV-C). Over 60% of the pigs harbored one PERV-A (907F8) integration and five PERV-B (B3-3G, B3-7G, 742H1, 1155D9 and 465D1) integrations. However, two PERV-A loci (A1-6C and 1347C1) and one PERV-B locus (B3-7F) were absent in Duroc pigs. Moreover, two PERV-C loci (C2-6C and C4-2G) only existed in Korean native pigs and NIH miniature pigs. The results suggest that PERV insertional variations differ among pig breeds as well as among individuals within a breed. Also, the results presented here can be used for the selection of animals that do not have specific PERV integration for xenotransplantation research.
Eltohamy, M.,Seo, J.W.,Hwang, J.Y.,Jang, W.C.,Kim, H.W.,Shin, U.S. Elsevier 2016 Colloids and surfaces. B, Biointerfaces Vol.144 No.-
<P>The preparation of the ideal smart drug-delivery systems were successfully achieved by the in situ co-polymerization of a vinyl group-functionalized mesoporous silica nanoparticle (f-MSN) with 1-butyl-3-vinyl imidazolium bromide (BVIm) and N-isopropylacrylamide (NIPAAm) monomers. The thickness of the capping copolymer layer, poly(NIPAAm-co-BVIm) (p-NIBIm), was controlled at between 2.5 nm and 5 nm, depending on the monomers/f-MSN ratio in the reaction solution. The finally obtained smart drug-delivery systems are named as p-MSN2.5 and p-MSN5.0 (MSNs integrated by 2.5 nm and 5 nm p-NIBIm layer in thickness). The key roles of the mesoporous-silica-nanoparticle (MSN) core and the p-NIBIm shell are drug-carrying (or containing) and pore-capping, respectively, and the latter has an on/off function that operates in accordance with temperature changes. According to the swelling- or shrinking-responses of the smart capping copolymer to temperature changes between 10 degrees C and 40 degrees C, the loading and releasing patterns of the model drug cytochrome c were studied in vitro. The developed system showed interesting performances such as a cytochrome-c-loading profile (loading capacity for 3 h = 26.3% and 19.8% for p-MSN2.5 and p-MSN5.0, respectively) at 10 degrees C and a cytochrome-c-releasing profile (releasing efficiency = > 95% within 3 days and 4days for p-MSN2.5 and p-MSN5.0, respectively) at 40 degrees C. The cytotoxicity of the drug delivery systems, p-MSN2.5 and p-MSN5.0 (in the concentration range of <0.125 mg/mL without drug), for human embryonic kidney (HEK 293) cells were minimal in vitro compared with that of a blank MSN. These results may be reasonably applied in the field of specified drug delivery. (C) 2016 Elsevier B.V. All rights reserved.</P>
Oh, S.H.,Kwon, M.C.,Choi, W.Y.,Seo, Y.C.,Kim, G.B.,Kang, D.H.,Lee, S.Y.,Lee, H.Y. Society for Bioscience and Bioengineering, Japan ; 2010 Journal of bioscience and bioengineering Vol.110 No.2
A unique perfusion process was developed to maintain high concentrations of marine alga, Chlorella minutissima. This method is based on recycling cells by continuous feeding with warm spent sea water from nuclear power plants, which has very similar properties as sea water. A temperature of at least 30 <SUP>o</SUP>C in a 200 L photo-bioreactor was maintained in this system by perfusion of the thermal plume for 80 days in the coldest season. The maximum cell concentration and total lipid content was 8.3 g-dry wt./L and 23.2 %, w/w, respectively, under mixotrophic conditions. Lipid production was found to be due to a partially or non-growth related process, which implies that large amounts of biomass are needed for a high accumulation of lipids within the cells. At perfusion rates greater than 1.5 L/h, the temperature of the medium inside the reactor was around 30 <SUP>o</SUP>C, which was optimal for cell growth. For this system, a perfusion rate of 2.8 L/h was determined to be optimal for maintaining rapid cell growth and lipid production during outdoor cultivation. It was absolutely necessary to maintain the appropriate perfusion rate so that the medium temperature was optimal for cell growth. In addition, the lipids produced using this process were shown to be feasible for biodiesel production since the lipid composition of C. minutissima grown under these conditions consisted of 17 % (w/w) of C<SUB>16</SUB> and 47% (w/w) of C<SUB>18</SUB>. The combined results of this study clearly demonstrated that the discharged energy of the thermal plume could be reused to cultivate marine alga by maintaining a relatively constant temperature in an outdoor photo-bioreactor without the need for supplying any extra energy, which could allow for cheap production of biodiesel from waste energy.
김동우(D. W. Kim),서원빈(W. B. Seo),김찬우(C. W. Kim),이하범(H. B. Lee) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.5
슈퍼커패시터는 높은 전력 밀도 및 긴 수명, 고속 충전과 같은 특성을 통해 에너지 저장 분야에서 많은 관심을 받고 있다. 이러한 슈퍼커패시터는 산화 환원 반응이 전극 표면에서 발생하는 작동 특성상 전극의 표면적이 넓어질수록 전기화학적 성능이 우수해진다. 이를 달성하고자 높은 표면적을 가진 탄소질 전극이 주목받았는데, 그 중 LIG (Laser-induced Graphene) 형태가 비표면적이 크고 경제적이라는 이유로 많이 연구되었다. 하지만, LIG 구조에서는 그래핀이 PI 필름 상에 부착되어 특정한 그래핀 표면만이 전기화학적 활성의 대상이 된다. 따라서, 모든 표면적을 활용하기 어렵게 되고 높은 표면적을 달성하기에 비효율적이다. 이러한 문제를 개선하고자 해당 연구에서는 레이저를 PI필름 위에 조사하여 섬유 형태의 그래핀을 추출하고 이를 전극으로 활용한 슈퍼캐패시터를 제작하였다. 해당 방식으로 추출된 섬유 형태의 다공성 그래핀은 2D상의 그래핀에 비해 표면적을 보다 효율적으로 활용할 수 있다. 제작된 섬유 형태의 그래핀 전극은 C-V 테스트 결과를 통해 동일한 J/mm 조건의 LIG 전극에 비해 보다 더 우수한 성능을 가지고 있음을 확인하였다. 해당 연구를 통해 기존의 LIG 응용 방식보다 큰 정전용량을 갖춘 슈퍼캐퍼시터를 달성할 수 있을 것으로 기대된다.
낙동강상류수계 (洛東江上流水系) 및 12지류의 화학적 수질조사연구 ( 1975 )
양경린,이철,박찬걸,서기림,김낙배,이인종,박두원 ( K R Yang,C Lee,C K Park,K L Seo,N B Kim,Y J Lee,D W Park ) 한국하천호수학회 1976 생태와 환경 Vol.9 No.1·2
The chemical water quality of the upper stream of the Nakdong river and 12 tributaries were investigated in order to obtain the basic data of water quality and survey the present status of pollution from April to October, 1975 bimonthly. The results showed that the contents of pollutants such as CN, Cd, Pb, and Cr were far bellow the drinking water standards in both the Nakdong river and 12 tributaries. Among 12 tributaries, Hancheon, Gumcheon, Eancheon, Secheon, and Bukcheon were very clean and healthy as uncontaminated water quality and the others were found to be contaminated partially with some metals.