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( Sung Jun Ko ),( Sun Mi Choi ),( Jin Woo Lee ),( Young Sik Park ),( Chang Hoon Lee ),( Jae Joon Yim ),( Chul Gyu Yoo ),( Young Whan Kim ),( Sung Koo Han ),( Sang Min Lee ) 대한결핵 및 호흡기학회 2014 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.118 No.0
Background: Adipose tissue is recently recognized as not only energy reservoir but also endocrine organ producing proinflammatory cytokines. Especially the impact of visceral adipose tissue(VAT) in critical illnesses has been proposed, but researches on the association between VAT and sepsis were scarce and quantitative measurement of VAT had not been used. Methods: In this retrospective cohort study, we enrolled patients with sepsis who examined abdominal computed tomography( A-CT) within 1 month of occurrence of sepsis, among the patients admitted to intensive care unit(ICU). Age, sex, anthropometric values, comorbidities and APACHE II score were reviewed. The areas of VAT and total adipose tissue(TAT) on the section of A-CT image of the umbilicus level were measured by calculating pixels presenting fat density. Results: Among 287 patients admitted to ICU due to sepsis, 178 patients were included for this study. Median age was 65 and 59.0% were men. In-hospital mortality rate was 57.9%. Women had higher TAT and subcutaneous adipose tissue, lower VAT/TAT ratio compared to men. The amount of VAT and VAT/TAT ratio were higher in in-hospital mortality group than in survivor group(90.41cm2 vs. 63.83cm2 and 45.88% vs. 32.79%, p=0.001 and <0.001, respectively). After adjusting age, sex, APACHE II score and comorbidities, multivariate logistic regression analysis revealed that the amount of VAT and VAT/TAT ratio were independent prognostic factors of sepsis with obvious dose-dependent relationship(VAT/TAT ratio quartile 3: OR 8.832, p<0.001 and quartile 4: OR 29.477, p<0.001, compared to quartile 1 respectively). Conclusion: The amount of VAT and VAT/TAT ratio quantitatively measured by A-CT were positively correlated with mortality in sepsis, and this association was dose-dependent. Visceral obesity should be considered as the poor prognostic factor of sepsis.
Prediction of parathyroid hormone signalling potency using SVMs
Yoo, Ahrim,Ko, Sunggeon,Lim, Sung-Kil,Lee, Weontae,Yang, Dae Ryook Springer-Verlag 2009 Molecules and cells Vol.27 No.5
<P>Parathyroid hormone is the most important endocrine regulator of calcium concentration. Its N-terminal fragment (1-34) has sufficient activity for biological function. Recently, site-directed mutagenesis studies demonstrated that substitutions at several positions within shorter analogues (1-14) can enhance the bioactivity to greater than that of PTH (1-34). However, designing the optimal sequence combination is not simple due to complex combinatorial problems. In this study, support vector machines were introduced to predict the biological activity of modified PTH (1-14) analogues using mono-substituted experimental data and to analyze the key physicochemical properties at each position that correlated with bioactivity. This systematic approach can reduce the time and effort needed to obtain desirable molecules by bench experiments and provide useful information in the design of simpler activating molecules.</P>
Ko, Jung Min,Cheon, Chong-Kun,Kim, Gu-Hwan,Kim, Sung Hoon,Kim, Kun Suk,Yoo, Han-Wook S. Karger AG 2010 Hormone research in pædiatrics Vol.73 No.1
<P><I>Aims:</I> The aim of this study was to perform a 5α-reductase type 2 gene <I>(SRD5A2)</I> analysis in 6 Korean patients with external genitalia ranging from predominantly female to male in whom 5α-reductase type 2 deficiency was suspected. <I>Patients:</I> Six patients from five unrelated families participated, and all of their parents were non-consanguineous. Three patients presented with ambiguous genitalia at birth, and 2 were referred owing to delayed puberty. The other patient was presented incidentally during an operation for inguinal hernia. Basal and post-human chorionic gonadotropin-stimulated serum testosterone and dihydrotestosterone levels were determined, but neither the levels nor ratio yielded enough information for differential diagnosis. Confirmative diagnosis was achieved by <I>SRD5A2</I> gene analysis. <I>Results:</I> Four different pathologic mutations were identified. All have already been reported, and are located in exon 1 (p.Q6X), exon 4 (p.G203S and c.655delT), and exon 5 (p.R246Q). p.R246Q was the most frequently identified mutation in our study, and c.655delT has been detected only in Korean patients to date. <I>Conclusion:</I> The molecular analysis is the most reliable method for a correct diagnosis of 5α-reductase type 2 deficiency. Identification of mutations also enables genetic counseling for families at risk.</P><P>Copyright © 2010 S. Karger AG, Basel</P>
Ko Sanghwan,Park Sora,Sohn Myung Ho,조미경,Ko Byoung Joon,Na Jung-Hyun,Yoo Hojin,Jeong Ae Lee,Ha Kyungsoo,Woo Ju Rang,Lim Chungsu,Shin Jung Hyu,Lee Dohyun,Choi So-Young,Jung Sang Taek 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-
The pH-selective interaction between the immunoglobulin G (IgG) fragment crystallizable region (Fc region) and the neonatal Fc receptor (FcRn) is critical for prolonging the circulating half-lives of IgG molecules through intracellular trafficking and recycling. By using directed evolution, we successfully identified Fc mutations that improve the pH-dependent binding of human FcRn and prolong the serum persistence of a model IgG antibody and an Fc-fusion protein. Strikingly, trastuzumab-PFc29 and aflibercept-PFc29, a model therapeutic IgG antibody and an Fc-fusion protein, respectively, when combined with our engineered Fc (Q311R/M428L), both exhibited significantly higher serum half-lives in human FcRn transgenic mice than their counterparts with wild-type Fc. Moreover, in a cynomolgus monkey model, trastuzumab-PFc29 displayed a superior pharmacokinetic profile to that of both trastuzumab-YTE and trastuzumab-LS, which contain the well-validated serum half-life extension Fcs YTE (M252Y/S254T/T256E) and LS (M428L/N434S), respectively. Furthermore, the introduction of two identified mutations of PFc29 (Q311R/M428L) into the model antibodies enhanced both complement-dependent cytotoxicity and antibody-dependent cell-mediated cytotoxicity activity, which are triggered by the association between IgG Fc and Fc binding ligands and are critical for clearing cancer cells. In addition, the effector functions could be turned off by combining the two mutations of PFc29 with effector function-silencing mutations, but the antibodies maintained their excellent pH-dependent human FcRn binding profile. We expect our Fc variants to be an excellent tool for enhancing the pharmacokinetic profiles and potencies of various therapeutic antibodies and Fc-fusion proteins.
Fabrication and superconducting property of $MgB_2$ tape with Al metal powder addition
Ko, Jae-Woong,Yoo, Jai-Moo,Chung, Kuk-Chae,Kim, Young-Kuk,Wang, Xiaolin,Dou, Shi Xue,Yoo, Sang-Im,Chung, Woo-Hyun The Korean Society of Superconductivity and Cryoge 2007 한국초전도저온공학회논문지 Vol.9 No.2
The sub micron sized spherical $MgB_2$ powders were synthesized by spray reaction method. $MgB_2$ tapes with Al addition were fabricated by Powder in Tube (PIT) method. The superconducting property and microstructure of Al doped $MgB_2$ tapes were characterized by X-ray diffraction, optical microscopy and transport measurement under magnetic field. The $J_c$ value of $MgB_2$ tapes was increased with 10 vol. % Al addition. The $J_c$ value of 5,500 A/$cm^2$ and 11,000 A/$cm^2$ at 4.2 K and 5 T were obtained for the $MgB_2$ tape and 10 vol. % of Al added $MgB_2$ tape without heat treatment, respectively. The $J_c$ value of 8,000 A/$cm^2$ and 33,000 A/$cm^2$ at 4.2 K and 5 T were obtained for the $MgB_2$ tape and 10 vol. % of Al added $MgB_2$ tape with heat treatment, respectively. The $J_c$-B curves show enhancement in $J_c$ (B), which suggests that the microstructure and transport properties of $MgB_2$ tapes have been improved with Al addition.