Genotoxicity and Embryotoxicity Study of Bicyclol Methyl Ether, Main Impurity in Bicyclol / 中国结合医学杂志

OBJECTIVE@#To assess the genotoxicity and embryotoxicity of bicyclol methyl ether (BME), the main impurity in bicyclol.@*METHODS@#Five concentrations of BME (0.5, 5, 50, 500 and 5000 μg/plate) were used in the Ames test to detect gene mutation. In the chromosome aberration test, Chinese hamster lung cells were used to detect chromosomal aberration of BME (15, 30, 60, 120 μg/mL) with or without S9 mixture. Embryotoxicity test was also conducted to determine any embryotoxicity of BME (7.5, 22.5, 67.5 μg/L) using zebrafish embryos.@*RESULTS@#No significant differences were observed in the Ames test and the chromosome aberration test in the BME groups compared with the vehicle control group. The zebrafish embryos toxicity test also showed no embryo development toxicity of BME, including hatching rate, body length, pericardial area and yolk sac area.@*CONCLUSIONS@#Bicyclol methyl ether has no genotoxicity in vitro and embryotoxicity in zebrafish embryos, and the impurity in bicyclol is qualified.

Quality control of chromosome preparation in the chromosome aberration test in vitro / 中国比较医学杂志

Objective To study the influencing factors and quality control of chromosome preparation during chromosome aberration test in vitro,and to summarize and analyze the method and key points of successful preparation of chromosome specimens in vitro. Methods Chinese hamster lung cells(CHL)were used for cell culture and chromosome preparation. Mitomycin and cyclophosphamide were used as positive mutagens. After routine hypotonic treatment,fixation, and squash preparation, finally, to read the film under the microscope. Results The CHL chromosome aberration test showed that both the chromosome aberration rates of mitomycin- and cyclophosphamide-treated cells were significantly increased(>20%),while the aberration rates in the negative control group were less than 5%, either with and without metabolic activation. The success rate was high and the prepared chromosomes were well dispersed with a moderate length. Conclusions Many factors can affect the specimen preparation in chromosome aberration test. Every step is very important,and it should be strictly following the operating procedures. It is of importance to grasp the principle of each step and to operate carefully,patiently and scientifically in order to prepare good specimens.

Allelopathic activity of micropropagated Hyssopus officinalis L., Lamiaceae, water infusions / Atividade alelopática de micropropagado Hyssopus officinalis L. infusãos aquosos

The natural habitats of Hyssopus officinalis L. (Lamiaceae) in Bulgaria are not sufficient to satisfy the needs of this herb. Micropropagation might be used for obtaining plants with desirable traits. Hyssopus is a medicinal aromatic plant that has not been studied very much. Recently aromatic plants were investigated as potent allelopathic plants. Determining the modes of action of allelochemicals is one of the challenging aspects in allelopathic studies. The objective of this study was to determine the allelopathic activity of micropropagated Hyssopus officinalis L. water infusions. We evaluated the influence of hot and cold infusions made from the aerial parts of hyssopus under laboratory conditions. For this purpose we tested the effects of infusions on germination and root elongation of Cucumis sativus L. and Triticum aestivum L. We determined also the effect on mitotic activity using Allium cepa L. chromosome aberration test. The results demonstrated the presence of water soluble allelopathic compounds in hyssopus tissue. Infusions exhibited growth depressive effect which was stronger at early stage of growth. The inhibitory effects on germination and root elongation were stronger in T. aestivum than in C. sativus. Hyssopus also exerted mitodepressive and genotoxic effect in Allium cepa root tip cells.

Os hábitats naturais de Hyssopus officinalis L. (Lamiaceae) na Bulgária não são suficientes para satisfazer as necessidades desta erva. A micropropagação poderia ser usada para obter plantas com características desejáveis. Hyssopus é uma planta aromática medicinal que não foi estudada muito. Recentemente plantas aromáticas foram investigadas como potentes plantas alelopáticas. A determinação dos modos da ação de aleloquímicos é um dos aspectos desafiantes em estudos alelopáticos. O objetivo deste estudo foi determinar a atividade alelopática de micropropagado Hyssopus officinalis L. infusãos aquosos. Foi avaliada a influência de infusões quentes e frias feito de partes aéreas de hyssopus sob condições de laboratório. Com este propósito nós testou os efeitos de infusões em germinação e alongamento de raiz de Cucumis sativus L. e Triticum aestivum L. Determinamos também o efeito na atividade mitótica usando os Allium cepa L. teste de aberração cromossômica. Os resultados demonstraram a presença de compostos alelopáticos solúveis de água em tecido de hyssopus. As infusões exibiram o efeito depressivo do crescimento que era mais forte na fase inicial de crescimento. Os efeitos inibitivos em germinação e alongamento de raiz foram mais fortes em T. aestivum que em C. sativus. Hyssopus também exerceu efeito genotóxico e mitodepressivo em células de ponta de raiz de Allium cepa.

Studies on mutagenicity of Schistosoma japonicum bivalent DNA vaccine / 中国血吸虫病防治杂志

Objective To evaluate the mutagenicity of Schistosoma japonicum bivalent DNA vaccine.Methods The mutagenicity of Schistosoma japonicum bivalent DNA vaccine was studied by Ames test,micronucleus test and chromosome aberration test.Results On the conditions of actived and unactived,Schistosoma japonicum bivalent DNA vaccine did not lead obvious increase of colony units,and the result of the Ames test was negative.Compared with the control group,there were no significant differences in the treated groups on the frequency of micronucleus in PCE or chromosome aberration.Conclusion There is no mutagenicity of Schistosoma japonicum bivalent DNA vaccine.