The THz-TDS in the frequency range of 0.05–1.0 THz has been used to study the blood serum of rats in dynamics of experimental liver cancer. THz transmission spectra of samples from healthy rats and for 14 and 28 days after implantation of tumor cells have a similar shape, but differ in amplitude. The protein content decreases for the case of 28th day of the implantation, as it have been measured by biochemical analysis. The observed changes in the THz response are explained by a decrease in the number of protein molecules and water bounded with it. Those results correlate with decrease in the refractive index in the visible and near IR range from 480 to 1550 nm, measured with a multiwave refractometer.

The possibilities of using fluorescent research methods and their advantages for visualization and determination of the type of programmed cell death of human tumor cells under the action of flavonoids in experiments in vitro were investigated. The object of the study were the tumor cells of cervical cancer HeLa and A498 kidney carcinoma, the flavonoid containing extract of hedge hyssop (Gratiola officinalis L.) was used for testing in the experiments. The following fluorescent methods were used: the "living and dead" test with double staining - - iodide propidium and acridine orange, the method of double staining with annexin and iodide propidium. The confirmation of autophagy induction was performed using Muse cell analyzer with fluorescent reagents MuseAutophagy LC3-Antibody Based Kit. The application of fluorescent staining methods using double staining with acridine orange and iodide propidium in the "living and dead" test compared to phase microscopy allows to visualize the formation of apoptotic cells and autophagosomes in cells and, therefore, can serve as one of the methods of evaluation screening of the effectiveness of various chemotherapy drugs.

No abstract

The effect of prolonged oral administration of gold nanoparticles of various sizes on the structure of the liver, spleen and lymph nodes of mature laboratory rats and their offspring was studied. The morphometric study was performed using the system of digital image analysis of medical Mikrovizor µVizo-103. The detection of conglomerates of gold nanoparticles in tissues was carried out using the dark field microscopy method. It was found that gold nanoparticles of sizes 2 and 50 nm cause the most pronounced morphological changes in the organs, which indicates the size-dependent character of their effects. In the liver of the group with 50 nm gold nanoparticles administration the expressed dystrophy of hepatocytes and activation of monocytic-macrophage system were observed. In the spleen and lymph nodes, the processes of proliferation and differentiation of immunocompetent cells and macrophages were activated. Oral administration of gold nanoparticles during pregnancy in females was accompanied by an increase in the number of hepatocytes with necrobiotic changes and an increase in the number of non-parenchymatous elements in the liver of the offspring, most pronounced in the groups with the administration of 2 and 50 nm gold nanoparticles.

Поступила в редакцию 11.12.2019 г. В окончательной редакции 17.02.2020 г. Принята к публикации 28.02.2020 г. С использованием флуоресцентных методов визуализации апоптоза и некроза в опухолевых клетках человека in vitro сравнивались эффективности противоопухолевого воздействия на клетки карциномы почки человека А498 флавоноидсодержащих экстрактов: аврана лекарственного и зеленого чая в сверхнизких концентрациях через 24 и 48 h. Флуоресцентные красители (йодистый пропидий и акридиновый оранжевый) использовались в тесте " живые и мертвые", что позволило выявлять общее количество погибших клеток путем некроза и апоптоза, а также клеток, в которых запустился апоптоз, при этом выявлялись апоптотические тельца или пикноз ядра. Наиболее выраженной цитостатической активностью через 48 h после воздействия обладал экстракт аврана, уменьшая количество клеток в поле зрения в 1.5 раза по сравнению с контролем. Наиболее выраженной цитотоксической активностью обладал экстракт зеленого чая в концентрации 0.0288 mg/ml, и выраженность ее нарастала через 48 h после воздействия. Экстракт аврана проявлял цитотоксическую активность при более низких концентрациях (0.0036 mg/ml).Ключевые слова: флуоресцентные методы визуализации, противоопухолевая активность, клеточная культура, цитостатическая активность, флавоноиды, рак почки, авран лекарственный.