• Biomolecules & Therapeutics
• /
• 제11권3호
• /
• pp.190-195
• /
• 2003

To assess the genotoxicity of AS6, several classical toxicological tests were performed. In Ames test, AS6 did not show any transformation of revertant with or without S-9 metabolic activating system, indicating the lack of mutagenic effect of the compound. To assess clastogenic effect, in vivo micronucleus and in vitro chromosomal aberration assays were performed using male ICR mice and Chinese hamster lung (CHL) fibroblast cells, respectively. Chromosomal aberration was not induced regardless of the presence of S-9 metabolic activating system. In addition, AS6 did not cause any increase in the incidence of micronucleated polychromatic erythrocytes at any of the dose levels, suggesting little clastogenicity in vitro or in vivo. Taken together, these results demonstrate that AS-6 has no mutagenic effect in our test system.

• Toxicological Research
• /
• 제16권1호
• /
• pp.77-82
• /
• 2000

This study was conducted to assess a possible alternative method as replacements for in vivo test. The human fibroblasts were exposed to several photoxic chemicals (promethazine, neutral red, chlortetracyclone, amiodatone, bithional, 8-methyooxypsorale) and non-phototoxi substance, ammonium laureth sulfate and irradiatied with 5 J/$cm^2$ of UVA (3320~420nm). The cell viability was measured by NRU (neutral red uptake) assay. The photoxic potential of test chemicals in the NRU PT (phototoxicity test) was assessed by determining the PIF (photoirritancy Factor) by using a cut-off value of 5. The NRU PT responses of most chemicals showed a close agreement with in vivo response except bithinol. There was a relatively good agreement between in vitro NRU assay and in vivo data. These results suggest that NRU assay using fibroblast could be used to predict the phototoxicity.

• 한국식품영양과학회지
• /
• 제31권5호
• /
• pp.910-916
• /
• 2002

생약재의 식품ㆍ생물 산업적 이용증대에 따라 생약재의 안전한 위생화 기술이 요구되고 있다 본 연구에서는 생약재의 위생화 기술로서 방사선 조사기법의 활용 가능성을 검토하기 위하여, 감마선을 조사한 생약재 3종에 대한 유전독성학적 안전성을 평가하고자 하였다. 공시 재료는 오염유기체 완전 구제선량인 10 kGy의 감마선을 조사시킨 황기, 백출 및 승마로 하였으며, 각각의 열수 추출물의 유전독성을 in vitro 시험으로 평가하였다. 유전독성 평가는 Salmonella typhimurium TA98 및 TA100 균주를 이용한 복귀 돌연변이 시험(Ames test)과 Chiilese hamster ovary(CHO) 세포를 이용한 in vitro 소핵 유발 시험으로 시행하였다. 각각의 시험은 59 nix를 첨가한 대사 활성화 시스템과 첨 가하지 않은 비활성화 시스템으로 구분하여 실시하였으며, 시료의 최고 처리 농도는 복귀돌연변이 시험에서는 5mg/plate로, 소핵유발시험에서는 50%의 세포증식 억제를 나타내는 농도(1 mg/mL)로 하였다. 복귀 돌연변이 시험 결과 대사 활성화 및 비활성화의 경우 모두에서 각 시료에 의한 복귀변이 집락수의 증가를 인정할 수 없었으며, 각 용량단계에서 감마선 조사군과 비조사군 간의 차이도 볼 수 없었으므로 음성으로 판정하였다. 소핵 유발시험에서도 음성 대조군 및 감마선 조사군과 비조사군 모두 각 용량 단계에서 세포 내에 생성된 소핵의 빈도가 3% 이하로 나타남에 따라, 시료에 의한 소핵의 유발을 인정할 수 없었으므로 음성으로 판정하였다 따라서 감마선이 조사된 각각의 시료는 직접 및 간접 돌연변이원으로 작용하지 않으며 세포유전 독성을 나타내지 않음을 확인할 수 있었다. 향후, 생체내 유전독성 시험, 만성독성 시험 및 생식독성 시험 등의 추가적인 in vivo실험이 행하여진다면 감마선 조사 생약재의 안전성을 보다 명확히 밝힐 수 있을 것으로 생각된다.

• 한국습지학회지
• /
• 제9권1호
• /
• pp.91-98
• /
• 2007

Antifungal activity of compost teas was evaluated in vitro and in vivo experiments. In vitro test, fourteen compost teas were produced using five different composts and through six different methods for compost tea production. Eleven pathogenic fungi were used as indicators of antifungal activity of compost teas. In vivo test, one of the compost teas used in vitro test was sprayed to cucumber leaves which were infected with powdery mildew in order to evaluate antifungal activity of compost tea. From the results of the tests, it was found that all compost teas used this study showed antifungal activity and the proper application of compost teas against pathogenic fungi for obtaining optimal effects was important to know.

• 한국재료학회지
• /
• 제14권4호
• /
• pp.287-292
• /
• 2004

A bio-composites were prepared by mechanical mixing with bioactive sol-gel derived $CaO-SiO_2$ and organic PEEK for bone repairing hybrid materials. The composites were characterized by in-vitro test. A bonelike apatite was formed on the surface of all bio-composites in SBF test. The cell morphology and adhesion on the surface of the composites having below 30% PEEK were clearly observed in L929 cell experiment.

• Toxicological Research
• /
• 제16권2호
• /
• pp.109-116
• /
• 2000

The purposes of our study were to optimize the conditions of the screening and testing methods for endocrine disruptors, to characterize these assays using several compounds with well-defined endocrine activity, and to compare the sensitivity between these assays currently undergoing validation. Two in vitro test systems, MCF-7 cells proliferation (E-screen assay) and competitive binding to estrogen receptors (ER) were selected to evaluate the estrogenic effects. 17$\beta$-Estradiol (E2) and diethylstilbestrol (DES) were used as a positive control in vitro test. Also, E2 and ethinyl estradiol (EE) were used as a positive control in vivo uterotrophic assay. In in vitro test, E2 and DES showed a strong estrogenic response at concentration of 1.0 nM. In uterotrophic assay, E2 (0.3 $\mu\textrm{g}$/kg) and EE (0.3 $\mu\textrm{g}$/kg) produced a significant increase in uterus and vagina weight in both immature and ovariectomized rats. Although we did not com-pared the specificity between in vivo and in vitro assays, these assay systems may serve as a good tool for endocrine disruptors screening methods. Our data indicate that these assay systems exhibit some difference in their sensitivity to the same estrogenic compounds. Therefore, as a first rapid screening assay for estrogenic activity qf unknown chemicals, at least two assay systems should probably be carried out with a view of high sensitivity and standardization conditions. Also, a careful validation tests are necessary to obtain a reasonable degree of reproducibility.

• Journal of Pharmaceutical Investigation
• /
• 제35권6호
• /
• pp.471-481
• /
• 2005

In Korea, generic drug and bioequivalence test are the hot issues since a new medical system of separation of dispensary from medical practice was started in 2000. The KFDA(Korea FDA) had revised several times ${\ulcorner}Guidance\;for\;bioequivalence\;test{\lrcorner}$. In vitro dissolution test has been extensively used as a quality control tool for solid oral dosage forms. In an effort to minimize unnecessary human testing, in vitro/in vivo correlations (IVIVC) between in vitro dissolution and in vivo bioavailability are increasingly becoming an integral part on extended release drug product development. The recently published US guidance, ${\ulcorner}Extended\;release\;oral\;dosage\;forms\;:\;development,\;evaluation,\;and\;application\;of\;in\;vitro/in\;vivo\;correlations{\lrcorner}$ will be helpful for us to make our own guideline.

• Toxicological Research
• /
• 제24권4호
• /
• pp.321-328
• /
• 2008

Smoke flavors based on the thermal decomposition of wood have been applied to a variety of food products as an alternative for traditional smoking. Despite its increasing use, the available genotoxicity data on wood smoke flavors (WSF) are still controversial. Thus, potential genotoxic effects of WSF in four short-term in vitro genotoxicity assays were investigated, which included the Ames assay, chromosomal aberration assay, micronucleus test and the alkaline comet assay. WSF did not cause any mutation in the Ames assay using five tester strains at six concentrations of 0.16, 0.31, 0.63, 1.25, 2.5 and 5 ${\mu}l/plate$. To assess clastogenic effect, the in vitro chromosomal aberration assay was performed using Chinese hamster lung cells. No statistically significant increase in the number of metaphases with structural aberrations was observed at the concentrations of 1.25, 2.5, and 5 ${\mu}l/ml$. The in vitro comet assay and micronucleus test results obtained on L5178Y cells also revealed that WSF has no genotoxicity potential, although there was a marginal increase in micronuclei frequencies and DNA damage in the respective micronucleus and comet assays. Taken together, based on the results obtained from these four in vitro studies, it is concluded that WSF is not a mutagenic agent in bacterial cells and causes no chromosomal and DNA damage in mammalian cells in vitro.

• Restorative Dentistry and Endodontics
• /
• 제46권3호
• /
• pp.33.1-33.12
• /
• 2021

Objectives: This study aimed to investigate the efficacy of ionic and non-ionic-based contrast media (in vitro study) and the combinatorial effect of chitosan-based endo-radiopaque solution (CERS) (in vivo study) for visualization of the root canal anatomy. Materials and Methods: In vitro study (120 teeth): The root canal of maxillary premolars and molars (in vitro group 1 and 2 respectively, n = 60 each) were analyzed using 4 different contrast media (subgroups: Omnipaque 350, Iopamidol, Xenetix 350, and Urografin 76; n = 15 each) in combination with 5.25% sodium hypochlorite (NaOCl). Based on the results of the in vitro study, in vivo study (80 teeth) was done to compare Xenetix 350 + 5.25% NaOCl with CERS (in vivo group 1 and 2 respectively, n = 40 each) on maxillary and mandibular premolars and molars. Two endodontists used radiovisiography to assess the depth of ingress and identify the aberrant root anatomy after access cavity preparation, and after initial cleaning and shaping of canals. Kruskal-Wallis test was used for in vitro comparison (p < 0.05), and Wilcoxon signed-rank test and Mann-Whitney U test for in vivo analysis (p < 0.01). Results: In vitro study, Xenetix 350 + 5.25% NaOCl facilitated a significant higher visualization (p < 0.05). For in vivo study, CERS had a statistically significant depth of ingress (p < 0.01), and was efficient in identifying the aberrant root canal anatomy of premolars and molars. Conclusions: CERS facilitates better visualization of the root canal anatomy of human premolars and molars.

• 대한의용생체공학회:의공학회지
• /
• 제12권1호
• /
• pp.29-34
• /
• 1991

Ventricular assist device(VAD) has been clinically applied as a temporary circulatory sup- porting system in the patients with severe heart failure, but small sized VAD for infant is not available. The purpose of tilis paper is to introdIAce small sized VAD and presents the result of in vitro test. Sejong VAD is diaphragmatic type of pneumatic pump and stroke volume is 11cc. Cardiac outputs of the Sejong VAD were measured by overflow tank under variable conditions of driving parameters. The cardiac output was 1.3 1/min at the heart rate of 120 per minute, left atrial pressure of $15cmH_2O$, percent systole of 43%, driving pressure of 240 mmHg, vacuum pressure of -40 mmHg, and mean aortic pressure of 70 mmHg. No mechanical problem was developed during the continuous in vitro test for 3 months.