• Toxicological Research
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• 제18권2호
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• pp.139-147
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• 2002

Hantaan (HTNV) and Puumala (PUUV) viruses cause hemorrhagic fever with renal syndrome in human. In the present study, the repeated dose toxicity of the HTNV-PUUV combination vaccine was evaluated in Sprague-Dawley rats. Animals were injected subcutaneously for 28 days with dosages of 0, 0.017, 0.17 and 1.7 dose/kg body weight per day, respectively. No any significant changes of body weight, food and water consumptions were shown. There were no death and clinical findings during the experimental period. In both male and female rats, there were not significant changes in hematological and serum biochemical analysis, urinalysis, and ophthalmoscopic and histopathological examination. These results indicate that the HTNV-PUUV combination vaccine may have no toxic effects and no observed adverse effect level (NOAEL) may be over 1.7 dose/kg/day at subcutaneous route in rats.

• 동아시아식생활학회지
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• 제15권4호
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• pp.431-436
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• 2005

In order to evaluate their possible subacute toxicity, the male and female of SD rats were given to 30 kGy irradiated porridge for three months. During the experimental periods, appearance, behavior, mortality, food and water consumption of rats fed the 30 kGy porridge were not affected compared with the non-irradiated control. In urine analysis, hematological as well as in serum biochemical findings, no significant differences were found between the non-irradiate control and 30 kGy porridge group. Although minor changes in biochemical parameters were observed, they were in the normal ranges. These results indicate that porridge irradiated at 30 kGy did not show any toxic effects under these experimental conditions.

• Journal of Microbiology and Biotechnology
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• 제18권7호
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• pp.1298-1307
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• 2008

In this study, we investigated the inhibition effects of single and mixed heavy metal ions ($Zn^{2+},\;Ni^{2+},\;Cu^{2+},\;and\;Cd^{2+}$) on iron oxidation by Acidithiobacillus ferrooxidans. Effects of metals on the iron oxidation activity of A. ferrooxidans are categorized into four types of patterns according to its oxidation behavior. The results indicated that the inhibition effects of the metals on the iron oxidation activity were noncompetitive inhibitions. We proposed a reduced inhibition model, along with the reduced inhibition constant ($\alpha_i$), which was derived from the inhibition constant ($K_I$) of individual metals and represented the tolerance of a given inhibitor relative to that of a reference inhibitor. This model was used to evaluate the toxicity effect (inhibition effect) of metals on the iron oxidation activity of A. ferrooxidans. The model revealed that the iron oxidation behavior of the metals, regardless of metal systems (single, binary, ternary, or quaternary), is closely matched to that of any reference inhibitor at the same reduced inhibition concentration, $[I]_{reduced}$, which defines the ratio of the inhibitor concentration to the reduced inhibition constant. The model demonstrated that single metal systems and mixed metal systems with the same reduced inhibitor concentrations have similar toxic effects on microbial activity.

• 한방비만학회지
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• 제17권2호
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• pp.96-100
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• 2017

Objectives: Samjung-hwan (SJH) is a Korean herbal formula that has been used for antilipidemic, antioxidant, and antidepressant effects. As a part of safety evaluation, single oral dose toxicity study of modified SJH in Sprague-Dawley (SD) rats was carried out. Methods: Modified SJH extract was administered orally in male and female SD rats at dose of 5,000 mg/kg. After single oral administration of modified SJH, we monitored the changes of mortalities, clinical signs, and body weight daily for 14 days. Gross necropsy findings were also evaluated at the end of the experiment. Results: Modified SJH extract did not induce any toxic signs in the changes of mortalities, clinical signs, and body weight. There were also observed no gross necropsy findings in rats. Conclusions: As results, the approximate lethal dose of modified SJH extract in SD rats was considered to be over 5,000 mg/kg. This suggests that modified SJH is safe herbal formula for the treatment with.

• Korean Journal of Acupuncture
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• 제36권1호
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• pp.74-80
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• 2019

Objectives : TA, a polyherbal extract, typically is used for pharmacopuncture therapy on patients with traffic accident-related injuries and musculoskeletal diseases. This study was performed to evaluate the safety of the TA extract, using a micronucleus test. Methods : The dose range and sampling time were first established. An in vivo micronucleus test was then performed to determine the induction of micronuclei in mouse bone marrow cells after a single intramuscular administration of TA to 7-week-old ICR mice (0.2 ml/animal, at 24 hours post-dosing). Results : The incidence of micro-nucleated polychromatic erythrocytes (PCEs) in PCEs in the TA group was similar to that in the negative-control group, while that in the positive-control group was significantly greater. The positive- and negative-control groups did not differ in the ratio of PCEs to total erythrocytes. Conclusions : Our toxicity study indicates that the TA extract does not induce micronucleus formation in mouse bone marrow cells.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2019년도 추계학술대회
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• pp.75-75
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• 2019

The aim of the study was to determine the anti-inflammatory activities of the plants with origin of China. The Fissistigma poilanei, which is a species of plant in the family Annonaceae and Rubus laxus Focke, which is a species of plant in the family Rosaceae from China were tested for anti-inflammatory activities. Samples were prepared using 95% ethanol using nitric oxide (NO) assay for assessing the anti-inflammatory activity. NO assay experiment showed that extracts of the Fissistigma poilanei give 28.3% increases in anti-inflammatory activity and extracts of Rubus laxus Focke give 57.1% decreases in anti-inflammatory activity, compared to control. To determine the cell toxicity, MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay was used. MTT assay experiment showed that Fissistigma poilanei and Rubus laxus Focke might have less toxicity of 60.5% and 62.3%, respectively, compared to control. Taken together, these experiments showed that Fissistigma poilanei extracts might have significantly higher anti-inflammatory activities and relatively lower toxicity, compared to control. This implies that this study might give a tool to develop a new potential anti-inflammatory therapeutic candidate.

• The Korean Journal of Physiology and Pharmacology
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• 제23권5호
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• pp.393-402
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• 2019

Aurora kinases inhibitors, including ZM447439 (ZM), which suppress cell division, have attracted a great deal of attention as potential novel anti-cancer drugs. Several recent studies have confirmed the anti-cancer effects of ZM in various cancer cell lines. However, there have been no studies regarding the cardiac safety of this agent. We performed several cytotoxicity, invasion and migration assays to examine the anti-cancer effects of ZM. To evaluate the potential effects of ZM on cardiac repolarisation, whole-cell patch-clamp experiments were performed with human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) and cells with heterogeneous cardiac ion channel expression. We also conducted a contractility assay with rat ventricular myocytes to determine the effects of ZM on myocardial contraction and/or relaxation. In tests to determine in vitro efficacy, ZM inhibited the proliferation of A549, H1299 (lung cancer), MCF-7 (breast cancer) and HepG2 (hepatoma) cell lines with $IC_{50}$ in the submicromolar range, and attenuated the invasive and metastatic capacity of A549 cells. In cardiac toxicity testing, ZM did not significantly affect $I_{Na}$, $I_{Ks}$ or $I_{K1}$, but decreased $I_{hERG}$ in a dose-dependent manner ($IC_{50}$: $6.53{\mu}M$). In action potential (AP) assay using hiPSC-CMs, ZM did not induce any changes in AP parameters up to $3{\mu}M$, but it at $10{\mu}M$ induced prolongation of AP duration. In summary, ZM showed potent broad-spectrum anti-tumor activity, but relatively low levels of cardiac side effects compared to the effective doses to tumor. Therefore, ZM has a potential to be a candidate as an anti-cancer with low cardiac toxicity.

• Toxicological Research
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• 제18권1호
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• pp.87-98
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• 2002

This study was conducted to evaluate the safety of a recombinant human Factor VIII(GC-$\gamma$ AHF) manufactured by Korea Green Cross Company with different technology according to the Regulation of Korean Food and Drug Administration (l 998. 12. 3). In acute toxicity test, both genders of Sprague-Dawley rats and Beagle dogs were administered intravenously with GC-$\gamma$ AHF of three doses (3,125, 625 and 125 IU/kg), and single dose of 3,125 IU/kg, respectively. No dead animal and abnormal autopsy findings were found in Control and GC-$\gamma$ AHF treated group. Therefore, the 50% lethal dose ($LD_{50}$) of GC-$\gamma$ AHF was conidered to be higher than 3,125 IU/kg in rats and dogs. In the four weeks repeated intravenous toxicity study, GC-$\gamma$ AHF was administrated intravenosly to both genders of rats and dogs with 3 doses (500, 150, 50 IU/kg). There were neither dead animals nor significant changes of body weights during the experimental Period. In addition, no significant GC-$\gamma$ AHF related changes were found in clinical sign, urinalysis and other finding. Statistically changes were observed in hematological, biochemical and organ weight parameters of treated groups: however these changes were not dose dependent. No histopathological lesion were observed in both control and treated animals. Above data suggest that no observed adverse effect level of test materials in rats and dogs might be over 500 IU/kg/day in this study. In ocular irritation test, any injury on iris, conjunctiva and cornea in rabbits were not observed. The acute ocular irritation index (A.O.I.), mean ocular irritation index (M.O.I.) and Day-7 individual ocular irritation Index (I.O.I.) of GC-$\gamma$ AHF were 0. In the primary skin Irritation test, the primary irritation index (P.I.I.) oj GC-$\gamma$ AHF were 0. Therefore, the GC-$\gamma$ AHF is considered not to have the primary skin and eye toxicity in rabbits. In active systemic anaphylaxis (ASA) test, GC-$\gamma$ AHF and GC-$\gamma$ AHF emulsified with Freund's complete adjuvant (FCA) did not induce any symptom of anaphylactic shock in guinea pigs. In passive cutaneous anaphylxis (PCA) test, after sensitization with antisera of GC-$\gamma$ AHF sensitized mice, blue spots were observed on the hypodermis of back of rats, but diameter of each spot was smaller than 5 mm in each test groups except the positive control group. Based on the results of this study, GC-$\gamma$ AHF is not conidered to have any antigenic potential. In conclusion, at levels of up to 500 IU/kg, GC-$\gamma$ AHF did not produce treatment-related toxicity under the conditions of these acute-, four week repeated-toxicity, primary skin and eye toxicity, and antigenicity test.

• 한국안전학회지
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• 제23권3호
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• pp.30-35
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• 2008

The recent fire incident in an elementary school of Chonan city causes the media focus on the fire safety of residential container buildings. In this study, real fire tests were conducted in this kind of buildings. Combustion products including $O_2$, $CO_2$, CO, $NO_x,$, $SO_x$, HCI, HCN were measured, in order to investigate the hazard-reduction effects of employing gas mask protected with filter during the fire emergency of residential container buildings. According to the test results, whether or not employing the filter showed a sheer difference in the toxicity of the fire-induced gases, and then the importance of wearing a gas mask was evidently demonstrated.

• Environmental Analysis Health and Toxicology
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• 제14권4호
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• pp.135-144
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• 1999

Environmental toxicities of priority water pollutants were evaluated by two selected bioassays, Lettuce seed germination/elongation test and Microtox acute toxicity test. Toxic chemicals (heavy metals, polycyclic aromatic hydrocarbons, and phenolic compounds) inhibited the germination rate and root elongation of Lettuce seed, as well as the bioluminescence of Microtox bacteria. When test biota were exposed to target chemicals, the sensitivity of Lettuce bioassay was relatively lower than that of Microtox bioassay. However, Lettuce bioassay may be a good candidate for prescreening the environmental toxicities of priority water pollutants, since the testing method with Lettuce seed was relatively easier and more economic than with Microtox bacteria. Toxicity tests were conducted to compare the validity and sensitivity of both bioassays for sediment from a small stream passed through urban area as well as leachate from a municipal solid waste landfill. From experimental results, we found that Lettuce test and Microtox test are compensated each other as a battery of bioassay for evaluating the environmental toxicities of field samples obtained from a small stream contaminated by pollutants.