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Lee, H. G,P. Y. Lee,Y. K. Lee,S. J. Kim,H. K. Chung,M. K. Seo,J. K. Park,K. S. Min,W. K. Chang 한국동물생명공학회(구 한국동물번식학회) 2003 Reproductive & developmental biology Vol.27 No.4
The effects of additions/deletions in glycosylated residues of recombinant human EPO (rhEPO) produced in CHO-K1 on their secretion were examined. hEPO cDNA was amplified from human liver mRNA and cloned into the pCR2.1 TOPO. Using overlapping-extension site-directed mutagenesis method, glycosylation sites at 24th, 38th, 83rd, and 126th were respectively or accumulatively removed by substituting its asparagine (or serine) with glutamine. To add novel glycosylation sites, 69 and 105th leucine was mutated to asparagine. Mutant and wild type rhEPO constructs were cloned into the pcDNA3 expression vector with CMV promoter and transfected into CHO cell line, CHO-K1, to produce mutant rhEPO mutant rhEPO proteins. Enzyme-linked immunosorbant assay (ELISA) and Western analysis with monoclonal anti-EPO antibody were performed using supernatants of the cultures showing transient and stable expressions respectively. Addition of novel glycosylation reduced rhEPO secretion dramatically while deletion mutants had little effect except some double deletion mutants (△24/83 and △38/83) and triple mutant (△24/38/83). This fact suggests that not single but combination of changes in glycosyl groups affect secretion of rhEPO in cell culture, possibly via changes in their conformations.
Control of Thermoelectric Properties through the addition of Ag in the Bi0.5 Sb1.5 Te3Alloy
( J. K. Lee ),( S. D. Kim ),( M. W. Oh ),( S. H. Cho ),( B. K. Min ),( H. W. Lee ),( M. H. Kim ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 ELECTRONIC MATERIALS LETTERS Vol.6 No.4
In this study, the thermoelectric properties of the Ag-doped Bi0.5Sb1.5Te3 compounds were investigated in the temperature range from 323 K to 573 K. Ingots were fabricated by a conventional melting process and the powder crushed from ingots was then sintered using a hot-pressing method. The temperature dependence of the Seebeck coefficient and the electrical conductivity of the Ag-doped Bi0.5Sb1.5Te3compound are characteristic of degenerate semiconductors, which is fairly different from the conventional Bi0.5Sb1.5Te3 compound. The power factor (α 2 σ) of the quaternary compound was larger than that of the ternary, which is mainly due to the increase in the electrical conductivity with doping content of Ag. The thermal conductivity was greater than that of the Ag-freeBi0.5Sb1.5Te3compound in the temperature range from 323 K to 523 K. The lattice thermal conductivity showed low values throughout the temperature range. The maximum value of the dimensionless figure of merit (ZT) of the 0.05 wt. % Ag-doped compound and the ternary alloy were 1.2 at 373 K and 0.88 at 323 K, respectively. Each of the maximum peak ZT shifts to a higher temperature region with increases in the doping content of Ag. This is likely due to the control of the lattice thermal conductivity by the twin structure, which had a nano-ordered layer.
지속형 천식 환자에서 아콜레이트 (R) (Zafirlukast) 투여에 따른 유효성과 안전성 및 내약성 평가를 위한 비대조, 다기관 임상연구
김능수,이양근,조영주,최병휘,최인선,박춘식,민경업,홍천수,박중원,윤호주,박해심 대한알레르기학회 2001 천식 및 알레르기 Vol.21 No.3
Background and Objective:Accolate, one of the cysteinyl leukotriene receptor antagonists, have anti-inflammatory and bronchodilating effects. The clinical indications for LT antagonist are not yet in consensus. We performed a non-comparative multicenter trial to assess the additional responses of Accolate to the current long-term control regimens in persistent asthma. Materials and Methods: Eighty persistent asthmatics from 10 asthma special care clinics were enrolled. Daily 20 mg of Accolate was added 2 times to the current control regimen for 6 weeks and its effects on symptom scores, morning and evening PEFR, FEV₁ and frequency of the short acting 2 agonist usage for relief of asthma were measured. Results: The morning symptom scores significantly improved by addition of Accolate for 1 week (p$lt;0.01) and its effect persisted to the 6th week (p$lt;0.01) of trial. Nocturnal symptom scores also improved at 2nd week (p$lt;0.05) and the effect continued to the end of this trial. Days with morning asthma symptoms deceased by addition of Accolate at 4th week (p$lt;0.05) and 6th week (p$lt;0.05). The frequency of the short acting β₂- agonist inhalations significantly decreased by addition of Accolate from 1st week to the end of this trial. Morning and evening PEFR significantly improved at 1st week and the effects progressively improved to the end of this trial. The FEV1 not improve by addition of Accolate. However, when the asthmatic with obstructed lung function (FEV₁ $lt;80%) were enrolled only for analysis, the FEV₁ significantly improved at 3rd (p$lt;0.05) and 6th weeks (p$lt;0.05). In 21 asthmatics, oral prednisolone was continuously used at the beginning of this trial. It could be discontinued in 4 patients and the dosage of prednisolone was significantly reduced in another 3 patients by addition of Accolate. Their mean administered dosage of prednisolone decreased from 8.6±0.9 mg/day to 6.8±1.1 mg/day at the end of this trial (p$lt;0.05). Conclusions: With these results, we thought that addition of Accolate as a long term control imen in the symptomatic persistent asthmatics would be an effective strategy. For evaluation of steroid sparing effects, further studies will be needed.
Effects of Acteoside on Maturation and Development of Porcine Oocytes In Vitro
K. J. Kim,J. H. Lee,X. X. Li,E. Y. Kim,Y. B. Park,K. S. Park,Y. N. Ha,M. Kim,K. W. Han,J. Y. Park,J. Yu,D. S. Lee,Min Kyu Kim 한국동물생명공학회(구 한국동물번식학회) 2011 발생공학 국제심포지엄 및 학술대회 Vol.2011 No.1
Acteoside (verbascoside) is a typical phenylethanoid glycoside, extracted from various plants. It has various biological functions such as anti-oxidant, anti-inflammation, and anti-hypertension. Specially, it was powerful anti-oxidants either by direct scavenging of reactive oxygen and nitrogen species, or by acting as chain-breaking peroxyl radical scavengers. We examined the role of acteoside in IVM medium on the morphological progress of meiosis, developmental competence, and ROS in porcine oocytes. And we investigated effect of acteoside on the oocytes condition represented by cytoplasmic maturation by homogeneous distribution and formation of cytoplasmic organelles and regulation of apoptosis-related genes. The selected COCs were cultured in TCM-199 with various concentration of acteoside: 0 (control), 10, 30, and 50 μM. After 22 h of maturation with hormones, the oocytes were washed twice in a fresh maturation medium before being cultured in hormone-free medium for additional 22 h. The oocytes maturation rates of supplemented with acteoside were no significantly different compared with control group (71.13, 75.96, 72.95 and 73.68%, respectively). Level of ROS was significantly decreased in acteoside treated group. Furthermore, the parthenogenetic blastocyst rate was significantly improved in 10 μM acteoside treated group compared with control group (40.03 vs. 22.95%). During IVM, 10 μM acteoside treated oocytes showed that the mitochondria and lipid droplet were smaller and homogeneous distribution in cytoplasm compare with non-treated control oocytes. And reverse transcription polymerase chain reaction (RT-PCR) witarthenogenetic blstocysts revealed that acteoside increased the anti-apoptoticgenes, otherwise reibued pro-apoptotic genes. In conclusion, our results represents that addition of acteoside to the IVM medium has a beneficial effect in physiology of porcine oocytes such as viability and activation, providing a improved method for porcine oocytes in vitro.