Purpose : Genetic and clinical factors can influence the permeability of the peritoneal membrane. The peritoneal equilibration test (PET) is helpful in measuring peritoneal permeability in peritoneal dialysis (PD). We investigated the influence of genetic polymorphism of vascular endothelial growth factor (VEGF) on the PET parameters. Methods : Pediatric patients who underwent PET within 12 months of initiating PD at Seoul National University Children's Hospital and Samsung Medical Center were selected. The patients with positive history of peritonitis before PET were excluded. The VEGF -2578C/A, -14978T/C, -1154G/A, -634G/C, and +936C/T single-nucleotide polymorphisms were genotyped. Results : The mean 4-hour dialysate-to-plasma ratio for creatinine (D/P creatinine) and the mean 4-hour dialysate glucose to baseline dialysate glucose ratio (D/$D_0$ glucose) were $0.56{\pm}0.13$ and $0.43{\pm}0.11$, respectively. The patients with haplotype CTGGC showed higher 4-hour D/P creatinine ($0.67{\pm}0.12$ vs $0.50{\pm}0.09$, P=0.007) and lower 4-hour D/$D_0$ glucose ($0.35{\pm}0.12$ vs $0.47{\pm}0.08$, P=0.037) than those without haplotype CTGGC. Conclusion : The VEGF genetic polymorphism may influence the peritoneal solute transport.
Free Radical Scavening and inflammatory of the methanol extracts, which were prepared from 6 difffrent bran of rice, were evaluated to investigate bioactive substances. Among them, the extract of C3GHibyeo and Heugjinjubyeo showed strong DPPH scavening activities (73.25% and 50.38% at 0.4 mg/ml, respectively). The extract of C3GHibyeo and Heugjinjubyeo showed strong thrombin inhibition activities (258.76% and 243.52% inhibition at 5 mg/ml, respectively). The result of antibacterial activity by Zone assay showed that C3GHi rice extract $(250{\mu}g\;and\;500{\mu}g)$ inhibited attachment of Helicobactor pylori on the ATCC48504 and COO1 cell line. But no effect on the SEO cell line. Cytotoxicity of blackish purple rice extract on the H. pylori doesn't showed. These result support a functional superiority of rice-base livelihood, and suggest that the development of healthy food using functional ingredients of rice is possible.
In this paper, we present two sets of fuzzy algorithms for the steam generator level control ; one for the high power operations where the flow error is available and the other for the low power operations where the flow error is not available. These are converted to a PID type controller for the high power case and to a quadratic function form of a controller for the low power case. These controllers are implemented on the Compact Nuclear Simulator at Korea Atomic Energy Research Institute and tested by a set of four simulation experiments for each. For both cases, the results show that the total variation of the level error and of the flow error are about 50% of those by the PI controllers with about one half of the control action. For the high power case, this is mainly due to the fact that a combination of two PD type controllers in the velocity algorithm form rather than a combination of two PI type controllers in the position algorithm form is used. For the low power case, the controller is essentially a PID type with a very small integral component where the average values for the derivative component input and for the controller output are used.
Lee, Seung Eun;Kim, Jang Uk;Jeong, Hyeon Soo;Choi, Je Hun;Ji, Yun Jeong;Kim, Hyung Don;Jang, Gwi Yeong;Hyun, Dong Yun;Kim, Dong Hwi
Korean Journal of Medicinal Crop Science
/
v.28
no.1
/
pp.9-20
/
2020
Background: Although a number of Panax ginseng cultivars have been developed by Korean researchers in recent years, there has been insufficient analysis of their beneficial properties. In this study, we sought to identify useful ginseng varieties as functional materials. Methods and Results: We evaluated effects of root extracts of 10 ginseng cultivars (Cheongsun; CS, Chunpoong; CP, Gopoong; GP, Gumpoong; GMP, K1, Sunhyang; SH, Sunone; SO, Sunpoong; SP, Sunun; SU and Yunpoong; YP) against the inhibitory effects of nitric oxide (NO) and reactive oxygen species (ROS) production in mouse brain microglial BV2 cells, as well as the binding of N-methyl-D-aspartate receptor (NMDAR), a marker related to memory. Ginsenosides, such as 20 (S)-protopanaxadiols (PPDs), including ginsenoside-Rb1, -Rb2, -Rb3, -Rc, -Rd, and - Rg3 and 20 (S)-protopanaxatriols (PPTs) including -Re, -Rg1, and -Rg2 were analyzed by HPLC. We observed that the cultivar GMP showed the highest inhibitory effect (60.8%) against NO production at 20 ㎍/㎖. Those cultivars showing the significantly highest inhibition effects against ROS at 20 ㎍/㎖ were K1 (57.3%), SP (54.5%), YP (53.1%), CP (51.7%), CS (50.9%) and SH (49.6%). At 50 ㎍/㎖, K1 showed the most potent inhibitory effect (51.2%) on NMDAR binding. The total phenol content of SH (1.89 mg/g) and K1 (1.73 mg/g) were higher than those of the other cultivars, whereas in terms of PD/PT ratios, the values of CP (0.98), K1 (1.05) and SO (1.05) were lower than those of the other cultivars. On the basis of correlation coefficient (0.7064) between NMDAR inhibition and ONOO- scavenging activity. Conclusions: The findings of this study indicate that the cultivars K1 and SH could be useful ginseng resources as functional materials with favorable cognition-improving and antioxidative properties.
Kim, Min-Ju;Kwak, Jung-Hyun;Baek, Seung-Han;Yeo, Hyun-Yang;Song, Ju-Hyun;Cho, Bong-Jun;Kim, Oh-Yoen
Preventive Nutrition and Food Science
/
v.15
no.2
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pp.137-142
/
2010
Previous studies report that organo-sulfur compounds derived from garlic inhibited smooth muscle cell (SMC) proliferation and induced apoptosis of cancer cells. Recently, lipid-soluble compounds such as diallyl sulfides (DAS) and diallyl disulfides (DADS) have been reported to more effectively suppress tumor cell proliferation. However, there were few studies on the suppressive effects of lipid-soluble garlic sulfur compounds on the proliferation and migration of vascular smooth muscle cells (VSMC). Therefore, this study investigated the effect of DAS and DADS on VSMC proliferation/migration induced by oleic acid (OA), a principal fatty acid in circulating triglyceride of blood stream. Assays performed include a tetrazole (MTT) assay, a wound healing assay and a Western blots. VSMC proliferations were enhanced by OA in a dose-dependent manner at concentrations of $10{\sim}50\;{\mu}M$ and inhibited by DAS and DADS compared to non-treated control. OA-induced proliferations were also attenuated by DAS and DADS. OA-induced cell migrations were 2.5 times higher than non-treated control, and they were significantly attenuated by DAS (32% at $150\;{\mu}M$ and 50% at $200\;{\mu}M$) and DADS (40% at $150\;{\mu}M$ and 46% at $200\;{\mu}M$). OA-induced cell migration was also attenuated by PD98059 (ERK inhibitor), SB203580 (P38 inhibitor) and particularly by LY204002 (PI3K inhibitor) and SP600125 (JNK2 inhibitor). Additionally, Western blot assays showed that OA-induced JNK1/2-phosphorylation was down-regulated after treatment with DAS and DADS. In conclusion, the findings of our study support the idea that DAS and DADS may have a suppressive effect on the proliferation and migration of OA-induced VSMC and that this effect may be partly associated with PI3K and JNK2 pathways.
Kim, Woo-Chul;Kim, Hun-Jung;Park, Jeong-Hoon;Huh, Hyun-Do;Choi, Sang-Huoun
Radiation Oncology Journal
/
v.29
no.1
/
pp.28-35
/
2011
Purpose: Recently, the use of radiosurgery as a local therapy in patients with early stage non-small cell lung cancer has become favored over surgical resection. To evaluate the efficacy of radiosurgery, we analyzed the results of stereotactic body radiosurgery in patients with primary or recurrent non-small cell lung cancer. Materials and Methods: We reviewed medical records retrospectively of total 24 patients (28 lesions) with non-small cell lung cancer (NSCLC) who received stereotactic body radiosurgery (SBRT) at Inha University Hospital. Among the 24 patients, 19 had primary NSCLC and five exhibited recurrent disease, with three at previously treated areas. Four patients with primary NSCLC received SBRT after conventional radiation therapy as a boost treatment. The initial stages were IA in 7, IB in 3, IIA in 2, IIB in 2, IIIA in 3, IIIB in 1, and IV in 6. The T stages at SBRT were T1 lesion in 13, T2 lesion in 12, and T3 lesion in 3. 6MV X-ray treatment was used for SBRT, and the prescribed dose was 15~60 Gy (median: 50 Gy) for PTV1 in 3~5 fractions. Median follow up time was 469 days. Results: The median GTV was 22.9 mL (range, 0.7 to 108.7 mL) and median PTV1 was 65.4 mL (range, 5.3 to 184.8 mL). The response rate at 3 months was complete response (CR) in 14 lesions, partial response (PR) in 11 lesions, and stable disease (SD) in 3 lesions, whereas the response rate at the time of the last follow up was CR in 13 lesions, PR in 9 lesions, SD in 2 lesions, and progressive disease (PD) in 4 lesions. Of the 10 patients in stage 1, one patient died due to pneumonia, and local failure was identified in one patient. Of the 10 patients in stages III-IV, three patients died, local and loco-regional failure was identified in one patient, and regional failure in 2 patients. Total local control rate was 85.8% (4/28). Local recurrence was recorded in three out of the eight lesions that received below biologically equivalent dose 100 $Gy_{10}$. Among 20 lesions that received above 100 $Gy_{10}$, only one lesion failed locally. There was a higher recurrence rate in patients with centrally located tumors and T2 or above staged tumors. Conclusion: SBRT using a CyberKnife was proven to be an effective treatment modality for early stage patients with NSCLC based on high local control rate without severe complications. SBRT above total 100 $Gy_{10}$ for peripheral T1 stage patients with NSCLC is recommended.
Purpose : Although the use of intravenous gamma-globulin(IVGG) in Kawasaki disease(KD) is effective in reducing clinical symptoms and coronary artery complications, 20-30% of patients have persistent or recrudescent fever and ongoing clinical symptoms. In these patients, the additional infusion of IVGG is considered. The authors studied the characteristics of patients who received IVGG retreatment, and compared them with the patients who did not need IVGG retreatment, for determination of IVGG retreatment. Methods : We reviewed the medical records of 117 KD patients who could be followed up at least six months. We studied the conventional laboratory findings, electrocardiogram(EKG), signal averaged ECG(SAECG) and echocardiogram. Results : Twenty three patients had early cardiac complications during the six months of follow-up. Four patients had late cardiac complications after six months. The early cardiac complication rate was higher in the IVGG retreatment group than the single infusion group(P<0.0001). The late complication rate was also higher in the retreatment group(P<0.0001). The patients who received methyl-prednisolone(m-PD) pulse therapy had much higher rates of early and late cardiac complications than those who received a single IVGG infusion. Among the clinical data and laboratory findings, only CRP increased significantly in patients who have had the cardiac complications. The IVGG retreatment group had increased CRP than the single infusion group. Conclusion : The patients with increased initial CRP may have an increased incidence of complications and an increased possibility of IVGG retreatment. We thought that retreated KD patients might have inflammations severe enough to need high dose IVGG as shown by high CRP levels, and IVGG retreatment could not prevent coronary artery lesions sufficiently.
1-$\beta$-Methyl carbapenem-2-substituted pyrroudine derivatives. CRB 529 and CRB 550, were synthesized as investigational carbapenem derivatives. It has been reported that the in vitro antibacterial activities of the compounds against G(+) and G(-) bacteria were almost the same or more effective than those of imipenem (IPM) and meropenem (MEPM), and also showed better in vivo efficacy than MEPM and inlipeneni/cilastatin (IPM/CS) against representative G(-) organisms, P. aeruginosa and MRSA organisms, S. aureus. The antibacterial activities, pharmacokinetics and protective efficacy of IPM/CS and CRB 529 and CRB 550 wereconducted after subcutaneous or intravenous administration to mice and rats. The pharmacokinetic parameters of CRB 529 and CRB 550 in mice were as follows: the observed maximal serum concentrations (C$_{max}$) following I.V. administration were 87.5 and 101 $\mu\textrm{g}$/ml for CRB 529 and CRB 550, respectively, and 63.6 $\mu\textrm{g}$/ml for IPM/CS. The half-lives (t$_{1/2}$) were 14.0 and 12.0 n-dn for CRB 529 and CRB 550, respectively, and 14.8 min for IPM/CS. In rats, $C_{max}$ after I.V. administration were 74.0 and 91.8 $\mu\textrm{g}$/ml for CRB 529 and CRB 550, respectively, and 41.2 $\mu\textrm{g}$/ml for IPM/CS. The tissue levels of CRB 529 and CRB 550 and IPM/CS after I.V. administration at a dose of 20 mg/kg decreased by the following order: lung, heart, kindney, liver and spleen for CRB 529, lddney, liver. lung, heart and spleen for CRB 550 and kidney, lung, liver, heart, spleen and brain for IPM/CS. In systemic infection, CRB 529 and CRB 550 showed excellent efficacies against P. aeruginosa and S. aureus (MRSA) at a dose of 5 mg/kg. The PD$_{50s}$ were 0.80, 0.36 mg/kg for CRB 529 and CRB 550, respectively, and 3.22 mg/kg for IPM/CS against P. aeruginosa. The corresponding values against S. aureus (MRSA) were 76.0, 55.3 mg/kg for CRB 529 and CRB 550, respectively, and 146 mg/kg for IPM/CS. In local infection, the antibacterial activities of CRB 529 and CRB 550 were more effective than those of IPM/CS against intrarenal infection with E. coli and P. aeruginosa and also showed as effective as IPM/CS against respiratory tract infection with E. coli and P. aeruginosa at a dose of 5 mg/kg.
Taxol, a natural product extracted from the Taxus brevifolia, is known to have significant anti-tumor activities against many common cancers, including ovarian and breast cancers. Despite the pronounced anti-tumor activity of this compound, its poor solubility in aqueous solutions hampers its clinical applications. We studied the anticancer mechanisms of the water-soluble taxol diethylenetriamine pentaacetate (DTPA) used for radiolabeling, and compared it to that of taxol. In vitro cytotoxicities of taxol and taxol-DTPA conjugate were tested in HT29 human colorectal cancer cells by the MTT method. As the result, the $IC_{50}$ value of the taxol-DTPA conjugate was about three fold higher than that of taxol. When analyzed by an agarose gel electrophoresis, the DNA ladders became evident after the incubation of cells with the taxol-DTPA conjugate for 24 h. We also found morphological changes of the cells undergoing apoptosis with electron microscopy Next, we examined the signal pathway of taxol-DTPA conjugate-induced apoptosis in HT29 cells. The activation of extracellular signal-regulated protein kinase (ERK1/2) occurred at 10, 30, 60 and 120 min after 200 nM taxol-DTPA conjugate treatment. The pretreatment of the MEK inhibitor (PD98059) completely blocked the taxol-DTPA conjugate-induced ERK1/2 activation. The activated ERK1/2 translocated into the nucleus at the same time and phosphorylated its transcriptional factor, c-Jun. These results suggest that the taxol-DTPA conjugate has an apoptotic activity in HT29 cells, and that its proapoptic activity might be related with the signal transduction via ERK1/2 and c-Jun similar to that of taxol.
Ginsenosides, one of the active ingredients of Panax ginseng, show various pharmacological and physiological effects, and they are converted into compound K (CK) or protopanaxatriol (M4) by intestinal microorganisms. CK is a metabolite derived from protopanaxadiol (PD) ginsenosides, whereas M4 is a metabolite derived from protopanaxatriol (PT) ginsenosides. The ${\gamma}$-aminobutyric acid $receptor_C$ ($GABA_C$) is primarily expressed in retinal bipolar cells and several regions of the brain. However, little is known of the effects of ginsenoside metabolites on $GABA_C$ receptor channel activity. In the present study, we examined the effects of CK and M4 on the activity of human recombinant $GABA_C$ receptor (${\rho}$ 1) channels expressed in Xenopus oocytes by using a 2-electrode voltage clamp technique. In oocytes expressing $GABA_C$ receptor cRNA, we found that CK or M4 alone had no effect in oocytes. However, co-application of either CK or M4 with GABA inhibited the GABA-induced inward peak current ($I_{GABA}$). Interestingly, pre-application of M4 inhibited $I_{GABA}$ more potently than CK in a dose- dependent and reversible manner. The half-inhibitory concentration ($IC_{50}$) values of CK and M4 were $52.1{\pm}2.3$ and $45.7{\pm}3.9{\mu}M$, respectively. Inhibition of $I_{GABA}$ by CK and M4 was voltage-independent and non-competitive. This study implies that ginsenoside metabolites may regulate $GABA_C$ receptor channel activity in the brain, including in the eyes.
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