• Title/Summary/Keyword: inhalation toxicity

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Studies on the Toxicity and Distribution of Indium Compounds According to Particle Size in Sprague-Dawley Rats

  • Lim, Cheol Hong;Han, Jeong-Hee;Cho, Hae-Won;Kang, Mingu
    • Toxicological Research
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    • v.30 no.1
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    • pp.55-63
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    • 2014
  • Objectives: The use of indium compounds, especially those of small size, for the production of semiconductors, liquid-crystal panels, etc., has increased recently. However, the role of particle size or the chemical composition of indium compounds in their toxicity and distribution in the body has not been sufficiently investigated. Therefore, the aim of this study was to examine the effects of particle size and the chemical composition of indium compounds on their toxicity and distribution. Methods: Male Sprague-Dawley rats were exposed to two different-sized indium oxides (average particle sizes under 4,000 nm [IO_4000] and 100 nm [IO_100]) and one nano-sized indium-tin oxide (ITO; average particle size less than 50 nm) by inhalation for 6 hr daily, 5 days per week, for 4 weeks at approximately $1mg/m^3$ of indium by mass concentration. Results: We observed differences in lung weights and histopathological findings, differential cell counts, and cell damage indicators in the bronchoalveolar lavage fluid between the normal control group and IO- or ITO-exposed groups. However, only ITO affected respiratory functions in exposed rats. Overall, the toxicity of ITO was much higher than that of IOs; the toxicity of IO_4000 was higher than that of IO_100. A 4-week recovery period was not sufficient to alleviate the toxic effects of IO and ITO exposure. Inhaled indium was mainly deposited in the lungs. ITO in the lungs was removed more slowly than IOs; IO_4000 was removed faster than IO_100. IOs were not distributed to other organs (i.e., the brain, liver, and spleen), whereas ITO was. Concentrations of indium in the blood and organ tissues were higher at 4 weeks after exposure. Conclusions: The effect of particle size on the toxicity of indium compounds was not clear, whereas chemical composition clearly affected toxicity; ITO showed much higher toxicity than that of IO.

Twenty-Eight-Day Repeated Inhalation Toxicity Study of Aluminum Oxide Nanoparticles in Male Sprague-Dawley Rats

  • Kim, Yong-Soon;Chung, Yong-Hyun;Seo, Dong-Seok;Choi, Hyun-Sung;Lim, Cheol-Hong
    • Toxicological Research
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    • v.34 no.4
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    • pp.343-354
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    • 2018
  • Aluminum oxide nanoparticles ($Al_2O_3$ NPs) are among the most widely used nanomaterials; however, relatively little information about their risk identification and assessment is available. In the present study, we aimed to investigate the potential toxicity of $Al_2O_3$ NPs following repeated inhalation exposure in male Sprague-Dawley rats. Rats were exposed to $Al_2O_3$ NPs for 28 days (5 days/week) at doses of 0, 0.2, 1, and $5mg/m^3$ using a nose-only inhalation system. During the experimental period, we evaluated the clinical signs, body weight change, hematological and serum biochemical parameters, necropsy findings, organ weight, and histopathology findings. Additionally, we analyzed the bronchoalveolar lavage fluid (BALF), including differential leukocyte counts, and aluminum contents in the major organs and blood. Aluminum contents were the highest in lung tissues and showed a dose-dependent relationship in the exposure group. Histopathology showed alveolar macrophage accumulation in the lungs of rats in the $5mg/m^3$ group during exposure and recovery. These changes tended to increase at the end of the recovery period. In the BALF analysis, total cell and neutrophil counts and lactate dehydrogenase, tumor necrosis factor-${\alpha}$, and interleukin-6 levels significantly increased in the 1 and $5mg/m^3$ groups during exposure. Under the present experimental conditions, we suggested that the no-observed-adverse-effect level of $Al_2O_3$ NPs in male rats was $1mg/m^3$, and the target organ was the lung.

Subacute(13-week) Inhalation Toxicity Study of Methyl Acrylate in Rats (랫드를 이용한 Methyl Acrylate의 아급성(13주) 흡입독성 연구)

  • Han, Jeong Hee;Park, Sang Yong;Kang, Min Gu;Chung, Yong Hyun;Yang, Jung Sun
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.22 no.4
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    • pp.316-328
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    • 2012
  • Objectives: This study was designed to provide the information regarding chemicals classification and health hazard by evaluating the toxicological effect through repeated inhalation exposure of methyl acrylate(MA) in Sprague-Dawley(SD) rat for 13 weeks. Methods: According to the notification with Ministry of Labor(No. 2009-68) and OECD Test Guideline 413, the rats were exposed to MA at concentration of 0, 56, 168, 280 ppm via whole body inhalation for 6 hours per day, 5 days per week, for 13 weeks. All animals were observed for mortality, morbidity and the change of body weight and food consumption were determined during the exposure period. Necropsy finding, organ weight, hematology, clinical biochemistry and histopathological examination following exposure were also performed. Results: There were no death and abnormal clinical signs relate to exposure MA. However, At 160 ppm and 280 ppm exposure groups, body weight and food consumption showed statistically significant decrease and histopathological changes in lung, trachea, nasal cavity, larynx were observed. Conclusions: MA was mainly affected respiratory tract. It is consequently provided to be classified as category 2(0.2 mg/L/6h < category 2 ${\leq}$ 1.0 mg/L/6h) for specific target organ toxicity following repeated exposure according to Standard for Classification and Labeling of Chemical Substance and Material Safety Data Sheet. The NOAEL(no observable adverse effect level) of MA was also determined to be lower than 56 ppm.

Study on Inhalation Toxicity of Iso-butylalcohol Using SD Rats (Rats를 이용한 Iso-butylalcohol의 아만성 흡입독성 연구)

  • Kin, Hyeon Yeong;Yun, Hyo In;Lee, Sung Bea;Chang, Beom Su;Jeong, Jae Hwang;Lim, Cheol Hong;Chung, Yong Hyun;Han, Jeong Hee;Zeon, Yoon Seok;Jang, Dong Hyuk;Ha, Chang Soo;Kim, Jong Chun;Lee, Yong Mook
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.9 no.2
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    • pp.66-78
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    • 1999
  • The purpose of this study was to investigate the toxic effects of iso-butylalcohol on Sprague-Dawley (SD) rats which were treated 0, 333, 1,000 and 3,000 ppm for 6 hours a day, 5 days a week for 13 weeks by inhalation. Iso-butylalcohol did not induce any abnormal change in the viewpoint of clinical signs, feed consumption, ophthalmic test, urinalysis, hematology and blood biochemistry during and at the termination of the inhalation toxicity test. We did not find any abnormal findings in the gross and microscopic observations due to the inhalation of iso-butylalcohol. There was no alteration in relative organ weight owing to the inhalation of the iso-butylalcohol. In conclusion, concentration was 3,000 ppm in rats under the inhalation of 6 hours a day, 5 days a week for 13 week. Iso-butylalcohol did not show any change in the clinical signs, feed consumption, ophthalmic test, urinalysis, hematology and blood biochemistry, together with no alteration in the gross and pathological findings.

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A Study on thinner's Physicochemical property and its effect on genital organ of rat (시너(thinner)의 물리화학적 특성과 랫트의 생식기에 미치는 영향 연구)

  • Kim, Hyeon-Yeong;Lee, Sung-Bae;Han, Jeong-Hee;Kim, Tae-Gyun;Lee, Jung-Suk;Kang, Min-Gu;Lee, Chae-Kwan
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.18 no.3
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    • pp.224-238
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    • 2008
  • The aim of this study is to confirm the physicochemical property and hazard of thinner (012), which is a diluent of enamel paint used for floor coating for waterproofing and oil painting for the outer wall. The literatures of physicochemical property and hazard of thinner were surveyed and its physicochemical property were evaluated. And then, the inhalation toxicity of thinner affecting the central nervous system and reproductive organs in rats were examined by subchronic (6 h./day. 5 days/ week for 13 weeks) inhalation test. 1) According to the 13-week subchronic inhalation test, there were no significant changes in clinical test and body weight. However, a significant evidence of toxicity was observed in the hematological test and organ weight such as heart, kidney, liver and brain (p<0.01) in the 200 ppm and 1,000 ppm exposure groups in a dose response manner. In the histopathology analysis, there were no significant evidence of toxicity. Therefore, thinner was not classified as an organ targeted toxic agent. In case of Harmfulness, it could be classified as a chronic toxic agent 3($500 ppm/4hr, rat). 2) The reproductive toxicity such as extension of the period of estrous cycle, reduction of serum estradiol concentration and increase of frequency of the abnormal sperm was observed in the 1,000 ppm exposed animals. 3) The result of the physicochemical property of the test material showed that the specific gravity was 0.793, boiling point $155.8^{\circ}C$, steam pressure 2.1 kPa, ignition point $34.5^{\circ}C$, and spontaneous ignition point $280^{\circ}C$. The endothermic and exothermic values were 371.4 J/g and 159.1 J/g. respectively. The explosion limit was 214 mg/l. These data showed that thinner could be classified as an explosion agent level 1.2 and ignitive liquid agent 3 ($23-60^{\circ}C$) according to the notification No. 2008-1 of the Labor Ministry, "Classifying Standard of Chemical Materials."

Inhalation of Carbon Black Nanoparticles Aggravates Pulmonary Inflammation in Mice

  • Saputra, Devina;Yoon, Jin-Ha;Park, Hyunju;Heo, Yongju;Yang, Hyoseon;Lee, Eun Ji;Lee, Sangjin;Song, Chang-Woo;Lee, Kyuhong
    • Toxicological Research
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    • v.30 no.2
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    • pp.83-90
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    • 2014
  • An increasing number of recent studies have focused on the impact of particulate matter on human health. As a model for atmospheric particulate inhalation, we investigated the effects of inhaled carbon black nanoparticles (CBNP) on mice with bleomycin-induced pulmonary fibrosis. The CNBPs were generated by a novel aerosolization process, and the mice were exposed to the aerosol for 4 hours. We found that CBNP inhalation exacerbated lung inflammation, as evidenced by histopathology analysis and by the expression levels of interleukin-6 protein, fibronectin, and interferon-${\gamma}$ mRNAs in lung tissues. Notably, fibronectin mRNA expression showed a statistically significant increase in expression after CBNP exposure. These data suggest that the concentration of CBNPs delivered (calculated to be $12.5{\mu}g/m^3$) can aggravate lung inflammation in mice. Our results also suggest that the inhalation of ultrafine particles like PM 2.5 is an impactful environmental risk factor for humans, particularly in susceptible populations with predisposing lung conditions.

Inhibitory Activity of Pesticide-preventing Active Carbon Fiber Mask on the Penetration of Pesticide and its Inhibitory Effect on Acute Inhalation Toxicity in Rats (탄소섬유 방제 마스크의 농약차단효과 및 흰쥐의 급성 흡입독성 예방효과)

  • Kim, Chang-Jong;Choi, Hyun-Ho;Shim, Sang-Soo;Shin, Hwa-Woo
    • YAKHAK HOEJI
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    • v.42 no.4
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    • pp.447-458
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    • 1998
  • Inhibitory activity of pesticide-preventing active carbon fiber mask on the penetrations in pesticide spray and its inhibitory effect on acute inhalation toxicity in rats were s tudied. Pesticides were sprayed into box ($1.O{\times}1.2{\tmies}O.6\;m$) at a dose of 20ml/min of diazinon ($Diatone^{TM}$) suspension (340ppm) and 5g/min of BPMC powder (2.0%) for 4 hours, and then captured the penetrated pesticides into water via mask in box under 8l/sec suction. The pesticides were analysed by A.O.A.C. method and GC/MS. Pesticide-preventing active carbon fiber mask significantly inhibited the penetration of diazinon by 93.4% as compared with control, and cotton mask and pesticide-preventing mask did it by 74.2% and 83.7%,respectively. This result shows that pesticide-preventing active carbon fiber mask has the most prominent inhibitory effect in preventing the penetration of diazinone. In the penetration of BPMC, all of three masks, such as active carbon fiber mask, cotton mask and pesticide-preventing mask, have a similar inhibitory effect, which were 99.3%, 98.6% and 97.0%, respectively. The penetrated pesticides via pesticide-preventmg active carbon fiber mask did not exert acute inhalation toxicity.

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Two Cases of Sodium Bicarbonate Inhalation Therapy in Chlorine Gas Intoxication (염소 가스 중독에서 나트륨 중탄산염의 흡입치료 2례)

  • Lee, Dong-Hoon;Eo, Eun-Kyung
    • Journal of The Korean Society of Clinical Toxicology
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    • v.2 no.1
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    • pp.49-53
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    • 2004
  • A chlorine gas is a common irritant and when exposed, it result in mild occular, oropharyngeal, or respiratory symptoms. In severe case, however, it may result in pulmonary edema, interstitial pneumonia, or respiratory failure. We report the case of 29-year-old and 46-year-old men is accidentally exposed to chlorine gas during cleaning water. The patients complained dyspnea, chest tightness, cough and both eye pain. During hospitalization, they were treated with inhalation of humidified oxygen, beta-adrenergic agonist and $2\%$ sodium bicarbonate. After several days, patients were discharged without respiratory symptoms and complication. In treatment of chlorine gas toxicity the inhalation of sodium bicarbonate is a possible initial therapy can improve respiratory symptoms in spite of lack of evidence.

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Toxicity Analysis of Carbon Nanotubes Based on Their Physicochemical Properties (서로 다른 물리화학적 특성을 갖는 탄소나노튜브(CNT)의 생물학적 독성 분석)

  • Kim, Soo-Nam;Kang, Min-Sung;Han, Young-Ah;Kim, Jae-Hwan;Roh, Jin-Kyu;Kim, Young-Hun;Choi, Sang-Dun;Park, Eun-Jung
    • Clean Technology
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    • v.17 no.3
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    • pp.273-279
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    • 2011
  • The physicochemical properties of manufactured nanomaterials can vary depending upon the methods of manufacture, although the utilized raw materials are same. Hence, the toxicity can also vary based on the methods of nanomaterials manufacture. In this study, we compared the toxicity effect of two types of CNTs (MWCNT, multi-walled carbon nanotube; SWCNT, single-walled carbon nanotube) that differ in length and wall number. In case of MWCNTs, inflammatory responses were more strongly induced in longer groups, whereas body weights more clearly decreased in shorter groups. SWCNT significantly decreased the relative weights of brain and kidney, and the inflow of immune cells and the hematological changes were observed significantly on day 1 and day 7 after exposure, respectively. Our results showed that the length and wall number of CNTs can serve as critical factors in the exhibited inflammation and toxicity.

ACUTE MAMMALIAN TOXICITY OF O-CHLOROBENZYLIDENE MALONONITRILE(CS)

  • Rim, Byung-Moo;Rim, Chae-Woong
    • Toxicological Research
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    • v.5 no.1
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    • pp.49-52
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    • 1989
  • Acute inhalation intoxication of CS (O-chlorobenzylidene malononitrile) occurred among the 192 animals in confined animal cages of farm as the result of prolonged exposure. A total of 8 animals (3 silver foxes, 3 fitches and 2 minks) died in 15 hours after the exposure. Distinct evidences of pulmonary atelectasis were observed as with hepatorenal damages. The lethal toxicity of CS was considered to be due to early severelung damages leading to asphyxia, accompanying acute toxic hepatitis and nephritis.

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