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이한들,박광식 한국독성학회 2019 Toxicological Research Vol.35 No.3
The possibility of eye exposure for workers participating in manufacturing of nanoparticles or consumers using products containing nanoparticles has been reported, but toxicity studies on the eye are scarce. In this study, cytotoxicity of five nanoparticles including silver, ceria, silica, titanium and zinc were tested using Statens Seruminstitut Rabbit Cornea (SIRC) cells. When cells were treated with nanoparticles with concentrations of 1-100 μg/mL for 24 hr, zinc oxide nanoparticles showed higher toxicity to cornea cells. LC50 of zinc oxide nanoparticles was less than 25 μg/mL but those of other nanoparticles could not be calculated in this test, which means more than 100 μg/mL. Generation of reactive oxygen species was observed, and expression of apoptosis related biomarkers including Bax and Bcl-2 were changed after treatment of zinc oxide nanoparticles, while no other significant toxicity- related changes were observed in cornea cells treated with Ag, CeO2, SiO2 and TiO2 nanoparticles.
표준입도 분산조건에서 나노입자의 THP-1 세포에 대한 독성영향
이한들(Handule Lee),박주영(Juyoung Park),박광식(Kwangsik Park) 대한약학회 2017 약학회지 Vol.61 No.2
Effect of nanoparticles on cellular toxicity can be influenced by size and/or size distribution of the tested nanoparticles. Therefore, it is necessary to fulfill the requirement of standardized dispersion when toxicity potencies of different types of nanoparticles are compared. In this study, probe-sonicator calibration for delivered acoustic power was performed according to the NANoREG protocol for standardized size-distribution of test nanoparticles including silica nanoparticles (SiNP), ceria nanopaaticles (CeNP), titania nanoparticles (TiNP), silver nanoparticles (AgNP) and zinc nanoparticles(ZnNP). Based on the protocol, the increase of water temperature by sonication power was monitored and Pac value was obtained. When the time of 8 minutes and 25% amplitude calculated from the Pac value was applied to the sonication of silica nanoparticles, size distribution reached to the effective level, 210 nm < size < 270 nm, Polydispersity index(PDI) < 0.46. The same acoustic power used in the dispersion of silica nanoparticles was applied to the other test nanoparticles, and cytotoxicity test was performed by MTS assay in cultured THP-1 cells treated with nanoparticles for 24 hrs. As results, Lethal Concentration 50% (LC50) of silver nanoparticles was 78.44 ppm, which was most toxic among the test nanoparticles. The toxicity compared by the LC50 seemed to be AgNP > SiNP > TiNP > ZnNP > CeNP.
실리카 나노입자의 분산조건에 따른 입도분포 변화 및 A549 세포독성
이한들(Han dule Lee),박주영(Ju young Park),박광식(Kwang sik Park) 대한약학회 2017 약학회지 Vol.61 No.6
Size and/or size distribution is a very important factor in the cellular toxicity test of nanoparticles. Therefore, it is necessary to fulfill the requirement of standardized dispersion protocol when toxicity potencies of different types of nanoparticles are compared. In this study, different conditions including ethanol pre-wetting, concentration of bovine serum albumin in media, and measurement instruments were investigated to see the impact on the dispersity of silica nanoparticles after calibrated sonication. As results, the concentration of bovine serum albumin seemed to mostly influence the dispersion of silica nanoparticles. No significant difference was shown in cytotoxicity of cultured A549 cells among silica (SiO₂), zinc (ZnO), silver (Ag), ceria (CeO₂) and titanium (TiO₂) nanoparticles when they were dispersed by same amount of energy after calibrated sonication.