To investigate the potential application of the single-cell gel electrophoresis (SCGE) assay to carp as an aquatic pollution monitoring technique, gill, liver, and blood cells were isolated from carp exposed to a direct-acting mutagen, N-methyl-N'-nitro-N-nitrosoguanidine (MNNG), or indirect mutagen, $benzo[\alpha]pyrene$$(B[\alpha]P)$, then the DNA strand breakage was analyzed using the assay. Based on testing 5 different cell isolation methods and 6 electrophoretic conditions, the optimized assay conditions were found to be cell isolation by filter pressing and electrophoresis at a lower voltage and longer running time (at 0.4 V/cm for 40 min). In preliminary experiments, gill and liver cells isolated from carp exposed to MNNG in vitro exhibited DNA damage signals even with 0.5 ppb exposure, which is a much higher dose than previously reported. In the gill cells isolated from carp exposed to 0.01-0.5 ppm MNNG in vivo, significant dose-and time-dependent increases were observed in the tail for 4 days. As such, the linear correlation between the relative damage index (RDI) values and time for each dose based on the initial 48-h exposure appeared to provide effective criteria for the genotoxicity monitoring of direct-acting mutagenic pollution. In contrast, the in vivo exposure of carp to 0.25-1.0 ppm of $B[\alpha]P$ for 7 days resulted in dose-and time-dependent responses in the liver cells, in which 24-h delayed responses for metabolizing activation and gradual repair after 48 h were also observed. Thus, the negative-sloped linear correlation between the RDI and time at each dose based on the initial 48 h appeared to provide more effective criteria for the genotoxicity monitoring of indirect mutagenic pollution.
This study was conducted to compare the antioxidant, anticytotoxic, and anti-inflammatory properties of Euphorbia maculata ethanol extract with those of E. supina ethanol extract. 2,2-Diphenyl-1-picrylhydrazyl (DPPH) radical and superoxide scavenging activities of E. maculata at $50{\mu}g/mL$ were $38.3{\pm}3.7$ and $21.5{\pm}1.2%$, respectively, whereas those of E. supina at the same concentration were $109.4{\pm}0.9$ and $59.5{\pm}4.8%$, respectively. Oxygen radical absorbance capacities of E. maculata and E. supina at $10{\mu}g/mL$ were $14.70{\pm}0.63$ and $26.17{\pm}1.36nmol/mL$ Trolox, respectively. Cupric reducing antioxidant capacities of E. maculata and E. supina at $10{\mu}g/mL$ were $10.22{\pm}0.97$ and $62.99{\pm}5.28nmol/mL$ Trolox, respectively. Total phenolic contents of E. maculata and E. supina at $50{\mu}g/mL$ were $29.03{\pm}0.14$ and $87.89{\pm}0.20nmol/mL$ gallic acid, respectively. E. maculata and E. supina were reported to prevent supercoiled DNA breakage induced by peroxyl and hydroxyl radicals in a concentration-dependent manner, where protection against the supercoiled DNA breakage provided by E. supina was greater than that provided by E. maculata. E. maculata and E. supina at $100{\mu}g/mL$ inhibited tert-butyl hydroperoxide-induced cytotoxicity in HepG2 cells by $49.4{\pm}4.3$ and $87.3{\pm}4.5%$, respectively. E. maculata and E. supina at $500{\mu}g/mL$ inhibited lipopolysaccharide-induced nitric oxide production in RAW 264.7 cells by $63.1{\pm}7.0$ and $85.2{\pm}1.6%$, respectively. The antioxidant capacities including DPPH radical scavenging, superoxide scavenging, oxygen radical absorbance, and cupric reducing antioxidant activity were found to be highly correlated with total phenolic content (0.896 < r < 0.983, p < 0.01) and anticytotoxic activities (0.915 < r < 0.960, p < 0.01). However, the superoxide scavenging activity was not significantly correlated (r = 0.604, p > 0.05) with the anti-inflammatory activity. Thus, these findings demonstrated that the radical scavenging, anticytotoxic, and anti-inflammatory capacities of E. supina were more potent than those of E. maculata. Further studies are needed to elucidate the properties of polyphenolic constituents in E. supina responsible for these effects and the underlying mechanisms.
Journal of the Korean Applied Science and Technology
/
v.35
no.4
/
pp.1250-1259
/
2018
In this study, Momordica charantia (MC) fermented with Leuconostoc mesenteroides (MC-LM) were assessed for the antioxidant and the antidiabetic activities. Antioxidant activities of MC and MC-LM were evaluated using 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid)(ABTS) radical. Although MC-treated groups showed little activity, 47% of activity was observed at $500{\mu}g/mL$ concentration for MC-LM and increased significantly(p<0.05) as MC-LM concentration increased. MC-LM more effectively inhibited the oxidative damage of DNA by peroxyl radical than MC and the inhibition of the strand breakage increased significantly as MC-LM concentration increased(p<0.05). Measuring the inhibition of ${\alpha}-glucosidase$ activity, which is closely related to the regulation of blood sugar, resulted in MC reduced the activity of ${\alpha}-glucosidase$ by 30% at 8 mg/mL and MC-LM at the same concentration by 60%. In addition, the effect of MC-LM on the cell viability of alloxan-treated RIN-m5F resulted in a significant increase in cell survival(p<0.05) in the group treated with MC-LM and a 20% increase in the concentration of $1000{\mu}g/mL$. As a result of insulin secretion by alloxan-treated RIN-m5F cell, the level of insulin secretion tended to increase in all group treated with MC-LM. At the concentration of $1000{\mu}g/mL$, the insulin secretion was increased by 15% in MC-LM group than in MC group. In conclusion, the results of this study suggest that fermented bitter gourd has antioxidant and antidiabetic effects.
During the 100 years since the initial discovery of meiotic phenomenon many brilliant aspects have been elucidated, but further researches based on light microscopy alone as an experimental tool have been found to have some limits and shortcomings. By the use of electron microscopy and armed with the advanced knowledges on modern genetics and biochemistry it has been possible to applu molecular technology in gaining information on the detailed aspects of meiosis. As synapsis takes place, a three-layered proteinous structure called the synatonemal complex starts to form in the space between the homologous chromosomes. To be more precise, it begins to form along the paired chromosomes early in the prophase I of meiotic division. The mechanism that leads to precise point-by-point pairing between homologous chromocomes division. The mechamism that leads to precise point-by-point pairing between homologous chromosomes remains to be ascertained. Several items of information, however, suggest that chromsome alignment leading to synapsis may be mediated somehow by the nuclear membrane. Pachytene bivalents in eukaryotes are firmly attached to the inner niclear membrane at both termini. This attached begins with unpaired leptotene chromosomes that already have developed a lateral element. Once attached, the loptotene chromosomes begin to synapse. A number of different models have been proposed to account for genetic recombination via exchange between DNA strands following their breakage and subsequent reunion in new arrangement. One of the models accounting for molecular recombination leading to chromatid exchange and chiasma formation was first proposed in 1964 by Holliday, and 30 years later still a modified version of his model is favored. Nicks are made by endomuclease at corresponding sites on one strant of each DNA duplex in nonsister chromatid of a bivalent during prophase 1 of meiosis. The nicked strands loop-out and two strands reassociate into an exchanged arrangement, which is sealed by ligase. The remaining intact strand of each duplex is nicked at a site opposite the cross-over, and the exposed ends are digested by exonuclease action. Considerable progress has been made in recent years in the effort to define the molecular and organization features of the centromere region in the yeast chromosome. Centromere core region of the DNA duplex is flanked by 15 densely packed nucleosomes on ons side and by 3 packed nucleosomes on the other side, that is, 2000 bp on one side and 400 400 bp in the other side. All the telomeres of a given species share a common DNA sequence. Two ends of each chromosome are virtually identical. At the end of each chromosome there exist two kinds of DNA sequence" simple telpmeric sequences and telpmere-associated sequencies. Various studies of telomere replication, function, and behabior are now in progress, all greatly aided by molecular methods. During nuclear division in mitosis as well as in meiosis, the nucleili disappear by the time of metaphase and reappear during nuclear reorganizations in telophase. When telophase begins, small nucleoli form at the NOR of each nucleolar-organizing chromosome, enlarge, and fuse to form one or more large nucleoli. Nucleolus is a special structure attached top a specific nucleolar-organizing region located at a specific site of a particular chromosome. The nucleolus is a vertical factory for the synthesis of rRNAs and the assenbly of ribosome subunit precursors.sors.
Kim, Jin Kyu;Woo, Hyun Jung;Kim, Ji Hyang;Yoon, Yang Dal
Korean Journal of Environmental Biology
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v.22
no.4
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pp.543-549
/
2004
Ixeris dentata is a typical oriental herb. It is a widely distributed perennial in Korea, Japan and China, which belongs to the Compositae Family. The whole plant of I. dentata has been used for the treatment of pneumonia, contusion, tumor and hepatitis. It has also been used for the treatment of allergic diseases as a folk therapy in Korea. I. dentata is known to have aliphatics, triterpenoids and sesquiterpene glycosides in its composition. The present study was designed to explore the protective effects of water- and ethanol- extracts from I. dentata on irradiated rodents. For oral administration (twice per day), the extractive powder of I. dentata and the positive control (ascorbic acid) were dissolved at a concentration of 0.5 and 250mg $ml^{-1}$ in saline, respectively. Thirty days after irradiation, the ratio of the weight of the testis to the body weight was lower than 50% in the radiation groups than the control group. The ALP concentrations in the group treated with the water-extracts of the leaf were $79.68\pm{1.39%}$ (p<0.05) of those of the radiation control. Both of the SGOT and SGPT in the group treated with the ethanol-extract of the root were $72.68\pm{0.95}\;and\;77.87\pm{5.74}$ (p<0.05) of those of the radiation control, respectively. The levels of DNA damage induced by gamma radiation decreased in the experimental group to which the extracts of I. dentata were administered before irradiation. In conclusion, these results indicate that the extracts of I. dentata have an excellent ability to reduce the radicals and they have a protective effect on DNA breakage caused by radiation.
Objective: An water extract of the Hwang-Ryun-Chung-Sim-Um (HRC) was assessed to determine the mechanisms of its antioxidant activity. In addition, the HRC was examined in vitro for the inhibitory effect on the acetylcholinesterse (AChE). Methods: The HRC exhibited a concentration-treatment; scavenging ${\alpha},{\alpha}-diphenyl-{\beta}-picrylhydrazyl$ (DPPH) radical, linoleic acid oxidation in a thiocyanate assay system, hydroxyl radical-induced DNA nicking. We investigated mRNA levels such as catalase activity, superoxide-dismutase and glutathione peroxidase. The water extract of HRC showed inhibitory effect on AChE activity. Result: The HRC extract showed dose-dependent free radical scavenging activity, including DPPH radicals and hydroxyl radicals, using different system. The HRC was also found to be effective in protecting plasmid DNA against the strand breakage induced by Hydroxyl radicals in Fenton's reaction mixture. Futhermore, catalase mRNA expression levels increased, but SOD1 and MnSOD was not expressed. HRC in a various concentration-dependent decreased AChE mRNA levels and inhibitory effect showed AChE. Conclusion: According to the above results, it is supposed that HRC is applicable to the Dementia-type of Alzheimer clinically.
Journal of the Korean Applied Science and Technology
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v.34
no.4
/
pp.1025-1035
/
2017
In this study, the hot water extract from Mulberry (Morus alba) Leaves fermented with Hericium erinaceum mycelium (MA-HE) was assessed for antioxidant activity. Radical scavenging activity of MA-HE evaluated using 2,2-diphenyl-1-picrylhydrazyl(DPPH) radical and 2,2'-azino-bis(3-ethyl-benzothiazoline-6-sulfonic acid)(ABTS) radical. MA-HE showed 63% DPPH radical scavenging activity at $500{\mu}g/mL$ and 98.27% ABTS radical scavenging activity at $250{\mu}g/mL$. MA-HE was shown to significantly inhibited DNA strand breakage induced by free radical. MA-HE also inhibited free radical-mediated human serum albumin modification. MA-HE effectively inhibited $H_2O_2$ induced cell death and significantly increased of the 8% cell survival at $100{\mu}g/mL$. MA-HE decreased intracellular reactive oxygen species (ROS) levels in $H_2O_2$-treated cells. The results suggested that MA-HE can contribute to antioxidant and protected cells from oxidative stress-induced cell injury.
In this study, we describe the development of a simple and efficient method for cell lysis via the insertion of a bacteriophage lambda lysis gene cluster into the pET22b expression vector in the following order; the T7 promoter, a gene for a target protein intended for production, Sam7 and R. This insertion of R and Sam7 into pET22b exerted no detrimental effects on cellular growth or the production of a target protein. The induction of the T7 promoter did not in itself result in the autolysis of cells in culture but the harvested cells were readily broken by freezing and thawing. We compared the efficiency of the cell lysis technique by freezing and thawing to that observed with sonication, and determined that both methods completely disintegrated the cells and released proteins into the solution. With our modification of pET22b, the lysis of cells became quite simple, efficient, and reliable. This strategy may prove useful for a broad variety of applications, particularly in experiments requiring extensive cell breakage, including library screening and culture condition exploration, in addition to protein purification.
Journal of Physiology & Pathology in Korean Medicine
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v.23
no.4
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pp.872-882
/
2009
Sachil-Tang (SCT) has been traditionally used as a prescription of spasm of the esophagus by stress, pectoralgia and oppressive feeling of the chest in Oriental medicine. This study was carried out to investigate the antioxidant activities of the ethanol extract of SCT and its inhibitory effect on intracellular oxidation and vascular cell adhesion molecule-1 expression in human umbilical vein endothelial cells (HUVECs) using various methods. The SCT extract showed a strong inhibitory effect on free radical generating model systems, including DPPH radical, superoxide anions, hydroxyl radical, peroxynirite and nitric oxide. Besides, the SCT extract exhibited a strong inhibitory effect on lipid peroxidation in rat liver homogenate induced by $FeCl_2$-ascorbic acid, and protected plasmid DNA against the strand breakage in a Fenton's reaction system. The SCT extract also inhibited copper-mediated oxidation of human low-density lipoprotein (LDL), and repressed relative electrophoretic mobility of LDL. Furthermore, the SCT extract protected intracellular oxidation induced by various free radical generators and inhibited expression of vascular cell adhesion molecule-1 (VCAM-1) in HUVECs. These results suggest that SCT can be an effective natural antioxidant and a possible medicine of atherosclerosis.
Plant growth promoting rhizobacteria and endophytic bacteria were isolated from different varieties of turmeric (Curcuma longa L.) from South India. Totally 50 strains representing, 30 PGPR and 20 endophytic bacteria were identified based on biochemical assays and 16S rDNA sequence analysis. The isolates were screened for antagonistic activity against Pythium aphanidermatum (Edson) Fitzp., and Rhizoctonia solani Kuhn., causing rhizome rot and leaf blight diseases in turmeric, by dual culture and liquid culture assays. Results revealed that only five isolates of PGPR and four endophytic bacteria showed more than 70% suppression of test pathogens in both assays. The SEM studies of interaction zone showed significant ultrastructural changes of the hyphae like shriveling, breakage and desication of the pathogens by PGPR B. cereus (RBacDOB-S24) and endophyte P. aeruginosa (BacDOB-E19). Selected isolates showed multiple Plant growth promoting traits. The rhizome bacterization followed by soil application of B. cereus (RBacDOB-S24) showed lowest Percent Disease Incidence (PDI) of rhizome rot and leaf blight, 16.4% and 15.5% respectively. Similarly, P. aeruginosa (BacDOB-E19) recorded PDI of rhizome rot (17.5%) and leaf blight (17.7%). The treatment of these promising isolates exhibited significant increase in plant height and fresh rhizome yield/plant in comparison with untreated control under greenhouse condition. Thereby, these isolates can be exploited as a potential biocontrol agent for suppressing rhizome rot and leaf blight diseases in turmeric.
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