• Journal of Periodontal and Implant Science
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• v.42 no.1
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• pp.13-19
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• 2012

Purpose: The aim of this study was to examine whether a previous peri-implantitis site can affect osseointegration, by comparing implant placement at a site where peri-implantitis was present and at a normal bone site. A second aim of this study was to identify the tissue and bone reaction after treating the contaminated implant surface to determine the optimal treatment for peri-implant diseases. Methods: A peri-implant mucositis model for dogs was prepared to determine the optimal treatment option for peri-implant mucositis or peri-implantitis. The implants were inserted partially to a length of 6 mm. The upper 4 mm part of the dental implants was exposed to the oral environment. Simple exposure for 2 weeks contaminated the implant surface. After 2 weeks, the implants were divided into three groups: untreated, swabbed with saline, and swabbed with $H_2O_2$. Three implants from each group were placed to the full length in the same spot. The other three implants were placed fully into newly prepared bone. After eight weeks of healing, the animals were sacrificed. Ground sections, representing the mid-buccal-lingual plane, were prepared for histological analysis. The analysis was evaluated clinically and histometrically. Results: The untreated implants and $H_2O_2$-swabbed implants showed gingival inflammation. Only the saline-swabbed implant group showed re-osseointegration and no gingival inflammation. There was no difference in regeneration height or bone-to-implant contact between in situ implant placement and implant placement in the new bone site. Conclusions: It can be concluded that cleaning with saline may be effective in implant decontamination. After implant surface decontamination, implant installation in a previous peri-implant diseased site may not interfere with osseointegration.

• Journal of Radiation Protection and Research
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• v.25 no.4
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• pp.183-190
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• 2000

Medicinal plants with synergistic effects on growth inhibition of canter cells under oxidative stress were screened in this study. Methanol extracts from 51 natural medicinal plants which were reported to have anticancer effort on hepatoma stomach cancer or colon cancers which are frequently found in Korean, were prepared and screened for their synergistic activity on growth inhibition of cancer cells under chemically-induced oxidative stress by using MTT assay. Twenty seven samples showed synergistic activity on the growth inhibition in various extent under chemically-induced oxidative stress. Among those samples, eleven samples such as Melia azedarach, Agastache rugosa, Catalpa ovata, Prunus persica, Sinomenium acutum Pulsatilla koreana, Oldenlandia diffusa, Anthriscus sylvestris, Schizandra chinensis, Gieditsia sinensis, Cridium officinale, showed decrease in $IC_{50}$ values more than 50%, other 16 samples showed decrease in $IC_{50}$ values between 50-25%, compared with the value acquired when medicinal plant sample was used alone. Among those 11 samples, extract of Catalpa ovata showed the highest activity. $IC_{50}$ values were decrease to 61% and 28% when carcinoma cells were treated with Catalpa ovata extract in combination of 75 and 100 uM of hydrogen peroxide, respectively.

• The Journal of Korean Medicine
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• v.28 no.2 s.70
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• pp.213-223
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• 2007

Objective : Alzheimer's disease (AD) is a geriatric dementia that is widespread in old age. With an aging populace, AD is a looming problem in public health service. Alzheimer's disease is characterized by specific neuronal degeneration in certain areas of the brain. Mutations and abnormal expression of several genes are associated with ${\beta}-amyloid$ deposits and Alzheimer's disease; among them APP, PS1, and PS2, SOD, free radical, ROS. Methods:We studied herbal medicines that have a relationship to brain degeneration. From pre-modern times, although a variety of oriental prescriptions of Aster tataricus have been traditionally utilized for the treatment of AD, their pharmacological effects and action mechanisms have not yet been fully elucidated. Result : Based on morphological observations by phase-contrast microscope, TUNEL assay and MTT in the culture media, $H_20_2-induced$ cell death was significantly inhibited by Aticus. We examined by ROS formation, catalase activity and GSH activity. We studied the protective effect and inhibitory effects of neurotoxicity in $H_20_2-induced$ PC-12 cells by Aticus. Findings from our experiments show that Aticus inhibits apoptosis, which has neurotoxicities and cell damage in PC-12 cells. In addition, treatment with Aticus ($>25{\mu}g/ml$ for 6hrs) partially prevented $H_20_2-induced$ cytotoxicity in PC-12 cells, and induced a protective effect. Conclusion : As the result of this study, in the Aticus group, the apoptosis in the nervous system was inhibited, protected against the degeneration of PC-12 cells by $H_20_2$. Taken together, Aticus exhibited inhibition of $H_20_2-induced$ apoptotic cell death. Aticus was found to induce protective effect on GSH and catalase in PC-12 cells. Based on these findings, Aticus may be beneficial for the treatment of AD.

• Journal of Korean Ophthalmic Optics Society
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• v.13 no.3
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• pp.95-101
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• 2008

Purpose: Hydrogen peroxide which is one of the reactive oxygen species has been seen to cause various diseases, various cellular disinfections, gene transformation and cell death. The goals of this study were to determine the protective effect of EGCG against $H_2O_2$-induced apoptotic death in conjunctival cell lines. Methods: We measured cell viability by MTT assay and analyzed DNA fragmentation to check up a distinctive feature in cell death and measured the removal ability of free radicals by DPPH free radical scavenging assay and evaluated the oxygen free radical's quantity in the cell by DCFH-DA assay. The mRNA expression in the cell were examined by RT-PCR. Results: Cell viability and free radical scavening activites was significantly increased in dose dependently after cell was exposed to EGCG. And DNA fragmentation and intracellular ROS was decreased. It was showed the mRNA expression which increase of bcl-2, bcl-xL expression and decrease of bax expression. Conclusions: From these results, it suggests that EGCG has an antioxidant effect and protects conjunctival cell lines from the $H_2O_2$-mediated apoptosis through the modulation of the mRNA expression.

• Journal of the Mineralogical Society of Korea
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• v.28 no.3
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• pp.233-244
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• 2015

In order to study the phase transformation of pyrite and to determine the maximum Fe leaching factors, pyrite samples were an electric furnace and microwave oven and then ammonia leaching was carried out. The rim structure of hematite was observed in the sample exposed in an electric furnace, whereas a rim structure consisting of hematite and pyrrhotite were found in the microwave treated sample. Numerous interconnected cracks were only formed in the microwave treated sample due to the arcing effect, and these cracks were not found in the electric furnace treated sample. Under XRD analysis, pyrite and hematite were observed in the electric furnace treated sample, whereas pyrite, hematite and pyrrhotite were found in the microwave treated sample. The results of the pyrite sample leaching experiments showed that the Fe leaching was maximized with the particle size of -325 mesh, sulfuric acid of 2.0 M, ammonium sulfate of 1.0 M, and hydrogen peroxide of 1.0 M. The electric furnace and microwave treated samples were tested under the maximum leaching conditions, the Fe leaching rate was much greater in the microwave treated sample than in the electric furnace treated sample and the maximum Fe leaching time was also faster in the microwave treated sample than in the electric furnace treated sample. Accordingly, it is expected that the microwave heating can enhance (or improve) Fe leaching in industrial minerals as well as pyrite decomposition in gold ores.

• Journal of Pharmacopuncture
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• v.13 no.2
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• pp.5-12
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• 2010

Reactive Oxygen Species(ROS) are continuously produced at a high rate as a by-product of aerobic metabolism. Since tissue damage by free radical increases with age, the reactive oxygen species(ROS) such as hydrogen peroxide($H_2O_2$), nitric oxide(NO). Several lines of evidence provided that ROS appears to cause to develop aging-related various diseases such as cancer, arthritis, cardiovascular disease. In this study, we have conducted to investigate the biological activities of Hominis Placenta Herbal Acupuncture by measuring total polyphenol content, DPPH radical scavenging, ABTS radical scavenging, Superoxide dismutase(SOD)-like activity, Nitrite scavenging ability in vitro. The total polyphenol contents of Hominis Placenta Herbal Acupuncture was $24.6m{\ell}/m{\ell}$. Elctron donation ability on DPPH was 49.4%. The 2,2'-azinobis-3-ehtlbezothiazoline-6-sulfonic acid radical decolorization (ABTS) was 50.01%, similar 10 the DPPH free radical scavenging. The superoxide dismutase (SOD)-like activities of hominis placenta herbal acupuncture was 50.876%. The nitrite scavenging abilities at pH 1.5, pH 3.0, pH 6.0 were 52.8%, 29.4%, 15.4%, respectively; these abilities decreased as pH increased. We conclude that Hominis Placenta Herbal Acupuncture may be useful as potential sources of antioxidant.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.20 no.4
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• pp.300-307
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• 1987

The present study was investigated on the DNA damage by the peroxidation of polar and non-polar lipid fractionated from mackerel lipid to elucidate the DNA damage mechanism by fish oil peroxidation. The degree of DNA damage by polar lipid peroxidation became greater with the increase of its concentration, and such DNA damage was induced below 100 millieq./kg in POV for 4 days incubation. Among the polar lipid peroxidation products, singlet oxygen $^1O_2$ and superoxide anion ${\cdot}O_2^-$ greatly affected to the DNA damage than hydrogen peroxide $H_2O_2$ and hydroxyl radical ${\cdot}OH$. Non-polar lipid peroxidation also induced the DNA damage with the increase of its concentration, but such effect was lower than the case of total lipid and polar lipid. And, the effects of active crygens on the DNA damage by non-polar lipid peroxidation was the same as in the case of total and polar lipid peroxidation.

• Journal of Periodontal and Implant Science
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• v.30 no.2
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• pp.403-420
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• 2000

The treatment and prevention of periodontitis is focused on the reduction and the elimination of pathogenic bacteria, especially A. actinomycetemcomitans and black pigmented bacteria such as P. gingivalis. To prevent recurrent disease, the recolonization of these bacteria should be inhibited in the periodontal pocket. Since the replacement therapy was introduced in periodontics by Hillman et al, Jeong et al reported that hydrogen peroxide-producing Lactobacillus acidophilus V-20 completely inhibited P. gingivalis and A. actino - mycetemcomitans in vitro and mouth gargling with Lactobacillus acidophilus V-20 in periodontitis patients during the maintenance phase improved clinical condition and reduced the No. of P. gingivalis and A. actinomycetemcomitans at 4 weeks of treatment. Prior to replacement therapy with bacteria, dynamics of microbial colonization should be considered. This study was performed to evaluate the change in the viable cell number of Lactobacilli and P. gingivalis after oral administration of L. acidophilus V-20. In periodontal health, gargling increased the No. of Lactobacilli in saliva, buccal mucosa, supragingival plaque from the first week, which maintained for 2-3 weeks after gargling stop, and then returned to the undetectable baseline level at the ninth week. In the periodontal pocket of moderate periodontitis patients, daily irrigation for 1 week and weekly irrigation for subsequent 3 weeks decreased the viable cell number of P. gingivalis during the period of irrigation and increased the number of Lactobacilli, which was maintained from the second to the seventh week. L. acidophilus V-20 was isolated for the first 2 weeks of oral administration, and the 3 different strains of Lactobacilli were isolated continuously for remaining period and identified as L. ali - mentarius, L. casei subspecies casei and L. fructosus. The first two Lactobacilli strains completely inhibited P. gingivalis in vitro and all the isolated Lactobacilli strains reduced the artificial plaque formation by 55-63%. These results showed that mouth gargling or pocket irrigation with L. acidophilus V-20 increased the No. of intraoral Lactobacilli and caused to decrease in the No. of P. gingivalis. This suggests that the replacement therapy by these Lactobacilli might be useful in the maintenance care of periodontal patients.

• Journal of Korean Society of Environmental Engineers
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• v.30 no.10
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• pp.1039-1046
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• 2008

The combining process of UV irradiation and H$_2$O$_2$ was used to investigate characteristics of cefaclor decomposition in the aquatic environment. The separate mixing tank was used to minimize the decreasing effective of contact area caused by sampling. Four baffles were installed inside the UV reactor for the complete mixing of the sample and outside of the reactor was wrapped with aluminum foil to protect the emission of photon energy. Production of OH radical was measured using pCBA(p-Chlorobenzoic acid) indirectly and rate constants were withdrawn pseudo-frist order reaction. Optimum condition for the maximum production of OH radical was found to be pH 3, hydrogen peroxide of 5 mmol/L and recirculation rate of 400 mL/min. Pseudo-frist order reaction rate constant was 0.1051 min$^{-1}$. In the optimum condition, cefaclor was completely decomposed within 40 min and rate constant was 0.093 min$^{-1}$. Decomposition by OH radical producted intermediate anions such as chloride, nitrate, sulfite and acetic acid and phenylglycine. After 6 hr most cefaclor was decomposed by UV/H$_2$O$_2$ process and converted to CO$_2$ and H$_2$O, resulting of operation in the decrease of TOC and acetic acid and the disappearance of phenylglycine.

• Journal of Physiology & Pathology in Korean Medicine
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• v.16 no.3
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• pp.452-457
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• 2002

Galla Rhois is a gallnut of Rhus javanica Linne used for treatment of diarrhea, hemorrhage, cough, leukorrhea and toxic tumor etc in oriental medicine. For the evaluation of antitumor effect of Galla Rhois, activity based fractionation was done. We isolated an effective compound and identified 1,2,3,4,6-penta-O-galloyl-β-D-glucose(PGG) by photometric analysis such as NMR and MASS. Then, we studied the angiogenic activity of PGG. It showed a cytotoxicity against SK-OV-3, SK-OV-3, HT1080 with IC/sub 50/ of 50 ug/ml approximately. It also effectively inhibited proliferation of HUVEC cells treated by bFGF to 30% of control at 20 ug/ml and cell migration to 80% at 10 ug in a dose dependent fashion. Tube formation of HUVEC cells on matrigel was effectively suppressed from 2.5 ug/ml of concentration by PGG. Moreover, it effectively recovered the dysfunction of gap junctional intercellular communication in WB-F344 rat liver epithelial cells caused by hydrogen peroxide at 4 ug/ml suggesting it potently can inhibit tumor promotion. Taken together, it indicates 1,2,3,4,6-penta-O-galloyl- β -D-glucose has antiangiogenic activity.