The Journal of Korean Institute of Communications and Information Sciences
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v.36
no.5A
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pp.511-520
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2011
In this paper, we introduce a multiuser (MU) scheduling method for multiuser amplify-and-forward relay systems, which selects both the transmission mode, i.e., either one- or two-hop transmission, and the desired user via two steps. A closed-form expression for the average achievable rate of the proposed scheduling is derived under two transmission modes with MU scheduling, and its asymptotic solution is also analyzed in the limit of large number of mobile stations. Based on the analysis, we perform our two-step scheduling algorithm: the transmission mode selection followed by the user selection that needs partial feedback for instantaneous signal-to-noise ratios (SNRs) to the base station. We also analyze the average SNR condition such that the MU diversity gain is fully exploited. In addition, it is examined how to further reduce a quantity of feedback under certain conditions. The proposed algorithm shows the comparable achievable rate to that of the optimal one using full feedback information, while its required feedback overhead is reduced below half of the optimal one.
Um, Ji Na;Min, Jin Woo;Joo, Kwang Sik;Kang, Hee Cheol
Journal of the Society of Cosmetic Scientists of Korea
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v.43
no.1
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pp.69-78
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2017
Hwangryunhaedoktang (HHT) has been traditionally used as a preventive and therapeutic medicine to treat enervation and diverse chronic diseases. This study was designed to compare the antioxidant, anti-wrinkle and whitening effects of HHT extract and its fermented extract by Leuconostoc mesenteroides (FHHT). FHHT was prepared by inoculation of L. mesenteroides after the extraction procedure with 70% ethanol. HHT and FHHT was investigated via high-performance liquid chromatography (HPLC). Simultaneous qualitative analysis of two bioacitive components, berberine and palmatine. was achieved by comparing their retention times ($t_R$) and UV spectra with those of the standard components. Cell viability test results indicated that both HHT and FHHT were non-toxic. In DPPH radical scavenging ability, $SC_{50}$ values of the FHHT was $68.85{\mu}g/mL$, which is more effective than HHT. Moreover, FHHT showed higher expression in production of procollagen type I than HHT. In nontoxic concentration range, FHHT showed strong melanin production inhibitory effect in ${\alpha}-melanocyte$ stimulating hormone (${\alpha}-MSH$)-stimulated B16F10 cell ($IC_{50}=9.82{\mu}g/mL$). These results suggested that fermented extracts of hwangryunhaedoktang had considerable potential as a cosmetics ingredient with an antioxidant and anti-wrinkle and whitening effects.
Kim, Kyung-Sook;Lee, Jin-Moo;Lee, Chang-Hoon;Jang, Jun-Bock;Lee, Kyung-Sub
The Journal of Korean Obstetrics and Gynecology
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v.24
no.3
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pp.14-27
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2011
Objectives: This study was designed to investigate the effects of Acanthopanacis Cortex Radicis extract(ACRE) on the apoptosis in HeLa cell and MCF-7 cell. Methods: After treatment with various concentration of ACRE, cell growth was evaluated in HeLa cell and MCF-7 cell. Hoechst 33342 staining was performed to estimate DNA fragment effect of ACRE on the apoptosis in HeLa cell and MCF-7 cell. Annexin V/PI apoptosis assay was used to estimate the effects of ACRE on the early apoptosis in HeLa cell and MCF-7 cell. RT-PCR was used to estimate the apoptosis gene expression effect of ACRE on Hela cell MCF-7 cell. Results: Under $0.1mg/m\ell$ of ACRE, cytotoxic effect was not found per NIH3T3 cell. The viability of HeLa cell and MCF-7 cells was significantly decreased ACRE ($100{\mu}g/m\ell$) in HeLa cell and MCF-7 cell, ACRE ($50{\mu}g/m\ell$) in HeLa cell 3 days after treatment, in MCF-7 cell 1&3 days after treatment (p<0.01). DNA fragmentation was observed 3 days after treatment of cl of ACRE on HeLa cell and MCF-7 cell. In Annexin V/PI apoptosis assay, after treatment of $100{\mu}g/m\ell$ of ACRE, the early apoptotic cell increased both in HeLa cell and MCF-7 cell. In RT-PCR analysis, after treatment of $100{\mu}g/m\ell$ of ACRE, bcl-2 were decreased and bax, caspase-3 were increased both in HeLa cell and MCF-7 cell. Conclusions: ACRE appears to have considerable activity on the apoptosis in HeLa cell and MCF-7 cell.
The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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v.23
no.2
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pp.13-26
/
2010
Objectives : The present study was conducted to evaluate the anti-inflammatory effects of the Gamroeum water extracts (GRE) in vivo and in vitro. Methods : The effects of GRE on anti-inflammation were measured by production of NO, $PGE_2$ (Prostaglandin $E_2$), iNOS (inducible Nitric Oxide Synthase), COX-2, $NF{\kappa}B$ (Nuclear Factor kappa B), TNF-$\alpha$ (Tumor Necrosis Factor-alpha) and IL-$1{\beta}$ (Interleukin-$1{\beta}$), IL-6 in Raw 264.7 macrophage cells stimulated with LPS. Results : 1. In machrophage cells, LPS displayed significant stimulatory effects on the production of NO and $PGE_2$. However, GRE showed significant inhibitory effects on NO and $PGE_2$ release. The level of NO and $PGE_2$ was decreased by GRE in a concentration dependent manner as compared with LPS only group. 2. Immunoblot analysis verified that LPS stimulation significantly increased the iNOS and COX-2 protein level, but GRE suppressed the induction of iNOS and COX-2 protein at a concentration dependent manner. 3. GRE reduced the elevated production of TNF-$\alpha$, IL-$1{\beta}$ and IL-6 by LPS. Moreover, the inhibitory effects of GRE was occurred in a dose-dependent manner. 4. GRE significantly reduced the expression of NF-${\kappa}B$ protein in nuclear fraction. 5. GRE effectively inhibited the increases of hind paw skin thicknesses and inflammatory cell infiltrations induced by carrageenan treatment. It, therefore, considered that GRE will be favorably inhibited the acute edematous inflammations. Conclusions : These results indicated that GRE could have anti-inflammatory capacity by inhibiting the production of NO, $PGE_2$ and cytokines in vitro and by reducing the formation of carrageenan-induced paw edema in vivo. Moreover, inhibitory effects of GRE on the macrophage activation were attributable to the reduction of some of inflammatory factors by inhibiting iNOS and COX-2 through the suppression of NF-${\kappa}B$.
The exact transmission coefficients at the interface between a uniaxial anisotropic medium and an isotropic medium at? oblique incidence are derived by applying the extended Jones matrix method. When the birefringence of the uniaxial anisotropic medium is small ($|n_e-n_o|\;{\ll}\;n_o,\;n_e$), the exact transmission coefficients are compared with those by the conventional extended Jones matrix method by Yeh et al. They showed an excellent agreement with each other. In addition, using the exact transmission coefficients, we calculated the polarization characteristics of a light through a uniaxial medium to an incident light with arbitrary polarization state at? oblique incidence. We compared the transmittances of an unpolarized light through a pair of crossed o-type polarizers by two different methods and calculated the transmittance as the variation of the optical constants of the polarizers to evaluate of the extinction ratio. The polarization analysis method using the exact transmission coefficients can be applied to polarization characteristics of a light through a uniaxial medium with large birefringence as well as to liquid crystals and to optical anisotropic material.
The cells of Campylobacter jejuni heat-shocked at 48${\circ}C$ for 30 min synthesized the heat shock proteins of HSP90, HSP66 and HSP60. Those heat shock proteins were found to correspond to the heat shock proteins of HSP87, HSP66 (DnaK), and HSP58 (GroEL) of E. coli, respectively. By Southern blot analysis of the chromosomal DNAs of C. jejuni with groESL and dnaK genes of E. coli as DNA probes, the heat shock genes of C. jejuni which are homologous to the E. coli groESL and dnaK genes were found to exist in the chromosomal DNA. The genomic libraries of C. jejuni were constructed with the cosmid vector pWE15 and the groEL gene of C. jejuni were cloned in E. coli B178 groEL44 temperature senstive mutant. The hybrid plasmid (pLC1) was inserted with the DNA fragment (about 5.7kb in size) containing the groEL gene. E. coli groEL44 mutant cell transformed with the pLC1 could grow at 42${\circ}C$ by synthesizing the HSP60 of C. jejuni and regained the susceptibility to the ${\lambda}$ vir phage by expression of the groEL gene in the cloned cells. These indicated that the groEL products of C. jejuni had chaperon effects by synthesizing the heat shock proteins in the cloned cells of E. coli.
Kim, Jae Kwang;Park, Sang Mi;Jegal, Kyung Hwan;Kim, Young Woo;Byun, Sung Hui;Kim, Sang Chan;Cho, Il Je
The Korea Journal of Herbology
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v.30
no.4
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pp.57-64
/
2015
Objectives : Oxidative stress is one of the most causes of hepatocyte injury. Gleditsia spina, the thorns ofGleditsia sinensisLam., has been known for its anti-cancer and anti-inflammatory effects in Korean medicine. The present study investigated hepatoprotective effect of Gleditsia spina water extract (GSE) against oxidative stress induced by arachidonic acid (AA) + iron in HepG2 cells.Methods : To investigate cytoprotective effect of GSE, cells were pretreated with GSE and then subsequently exposed to 10 μM AA for 12 h, followed by 5 μM iron. Cell viability was monitored by MTT assay, and expression of apoptosis-related proteins was examined by immunoblot analysis. To identify responsible molecular mechanisms, reactive oxygen species (ROS) production, GSH contents, and mitochondrial membrane potential were measured. In addition, effect of GSE on nuclear factor erythroid 2-related factor 2 (Nrf2) activation was determined by immunoblot and antioxidant response element (ARE)-driven reporter gene assays.Results : GSE pretreatment prevented AA + iron-mediated cytotoxicity in concentration dependent manner. In addition, ROS production, glutathione depletion, and mitochondrial impairment by AA + iron were significantly inhibited by GSE. Furthermore, GSE promoted translocation of Nrf2 to nucleus, which acts as essential transcription factor for induction of antioxidant genes. Increased nuclear Nrf2 that caused by GSE treatment promoted transcriptional activity of ARE. Finally, GSE up-regulated sestrin-2 which was widely recognized as target gene of Nrf2.Conclusions : This study demonstrates that GSE protects hepatocytes from oxidative stress via activation of Nrf2 signaling pathway.
Journal of the Korean Association of Oral and Maxillofacial Surgeons
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v.26
no.6
/
pp.581-590
/
2000
Alterations in the cellular genome affecting the expression or function of genes controlling cell growth and differentiation are considered to be the main cause of cancer. Over 30 oncogenes can be activated by insertional mutagenesis, single point mutations, chromosomal translocations and gene amplification. The ras oncogenes have been detected in $15{\sim}20%$ of human tumors that include some of the most common forms of human neoplasia and are known to acquire their transforming properties by single point mutations in two domains of their coding sequences, most commonly in codons 12 and 61. The ras gene family consists of three functional genes, N-ras, K-ras and H-ras which encode highly similar proteins of 188 or 189 amino acid residues generically known as P21. ras proteins have been shown to bind GTP and GTP, and possess intrinsic GTPase activity. Experimental study was performed to observe the mutational change of the ras gene family and apply the results to the clinical activity. 36 Golden Syrian Hamster each weighing $60{\sim}80g$ were used and painted with 0.5% DMBA by 3 times weekly on the right buccal cheek(experimental side) for 6, 8, 10, 12, 14 and 16 weeks. Left buccal cheek (control side) was treated with mineral oil as the same manner of the right side. The hamsters were sacrificed on the 6, 8, 10, 12, 14 & 16 weeks. Normal and tumor tissues from paraffin block were completely dissected by microdissection and DNA from both tissue were isolated by proteinase K/phenol/chloroform extraction. Segments of the K-ras and H-ras gene were amplified by PCR using the oligonucleotide primers corresponding to the homologous region (codon 12 and 61) of the hamster gene, and then confirmational change of ras genes was observed by SSCP and autosequencing analysis. The results were as follows : 1. Malignant lesion could be found in the experimental side from the experimental six weeks. 2. One hamster among six showed point mutation of the H-ras codon 12($G{\rightarrow}A$ transition) at the experimental 10 and 14 weeks. 3. One of six at 6 weeks, two of six at 8 weeks and one of six at 12 weeks revealed the confirmational change of the H-ras codon 61($A{\rightarrow}T$ transversion). 4. The incidence of point mutation of H-ras codon 12 and 61 were 5.5%(2 of 36) and 11%(4 of 36) respectively. 5. Point mutation of the K-ras could not be seen during the whole experimental period. Form the above results, these findings strongly support the concept that H-ras oncogenes may have the influence of the DMBA induced carcinoma of hamster buccal pouch.
The p53 gene is inactivated by the human papillomavirus (HPV) E6 protein in the majority of cervical cancers. Treatment of HeLa S3 cells with siRNA for HPV E6 permitted adenovirus-mediated transduction of a p53 gene linked to an upstream estrogen response element (ERE). Our previous study in non-siRNA treated HHUA cells, which are derived from an endometrial cancer and express estrogen receptor ${\beta}$, showed enhancing effects of an upstream ERE on adenovirus-mediated p53 gene transduction. In HeLa S3 cells treated with siRNA for HPV E6, adenovirus-mediated transduction was enhanced by an upstream ERE linked to a p53 gene carrying a proline variant at codon 72, but not for a p53 gene with arginine variant at codon 72. Expression levels of p53 mRNA and Coxsackie/adenovirus receptor (CAR) mRNA after adenovirus-mediated transfer of an ERE-linked p53 gene (proline variant at codon 72) were higher compared with those after non-ERE-linked p53 gene transfer in siRNA-treated HeLa S3 cells. Western blot analysis showed lower ${\beta}$-tubulin levels and comparatively higher p53/${\beta}$-tubulin or CAR/${\beta}$-tubulin ratios in siRNA-treated HeLa S3 cells after adenovirus-mediated ERE-linked p53 gene (proline variant at codon 72) transfer compared with those in non-siRNA-treated cells. Apoptosis, as measured by annexin V binding, was higher after adenovirus-mediated ERE-linked p53 gene (proline variant at codon 72) transfer compared with that after non-ERE-linked p53 gene transfer in siRNA-treated cells.
Background: Breast cancer (BCa) is the most common malignancy in Mexican women. A set of histopathological markers has been established to guide BCa diagnosis, prognosis and treatment. Nevertheless, in only a few Mexican health services, such as that of the Secretariat of National Defense (SEDENA for its acronym in Spanish), are these markers commonly employed for assessing BCa. The aim of this study was to explore the association of Ki67, TP53, HER2/neu, estrogenic receptors (ERs) and progesterone receptors (PRs) with BCa risk factors. Materials and Methods: Clinical histories provided background patient information. Immunohistochemical (IHC) analysis was conducted on 48 tissue samples from women diagnosed with BCa and treated with radical mastectomy. The Chi square test or Fisher exact test together with the Pearson and Spearman correlation were applied. Results: On average, patients were $58{\pm}10.4$ years old. It was most common to find invasive ductal carcinoma (95.8%), histological grade 3 (45.8%), with a poor Nottingham Prognostic Index (NPI; 80.4%). ERs and PRs were associated with smoking and alcohol consumption, metastasis at diagnosis and Ki67 expression (p<0.05). PR+ was also related to urea and ER+ (p<0.05). Ki67 was associated with TP53 and elevated triglycerides (p<0.05), and HER2/neu with ER+, the number of pregnancies and tumor size (p<0.05). TP53 was also associated with a poor NPI (p<0.05) and CD34 with smoking (p<0.05). The triple negative status (ER-/PR-/HER2/neu-) was related to smoking, alcohol consumption, exposure to biomass, number of pregnancies, metastasis and a poor NPI (p<0.05). Moreover, the luminal B subty was associated with histological type (p=0.007), tumor size (p=0.03) and high cholesterol (p=0.02). Conclusions: Ki67, TP53, HER2/neu, ER and PR proved to be related to several clinical and pathological factors. Hence, it is crucial to determine this IHC profile in women at risk for BCa. Certain associations require further study to understand physiological/biochemical/molecular processes.
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