The development of a method for determining the biological activity of erythropoietin preparations in vitro

The method for the assessment of biological activity of erythropoietin preparations in vitro on TF-1 sensitive cells culture has been developed. The special characteristics of measurements and calculations of the biological activity of erythropoietin with different levels of glycosylation in vivo and in vitro. Linear response ranges for cell lines to erythropoietin and its hyperglycosylated analogue differ and make (0.39-0.56 ng/ml) and (3.1-12.5 ng/ml), respectively. The results have shown the possibility of using cellular test for comparing and assaying the activity of erythropoietin analogues in standard international units of biological activity (IU) set for erythropoietin

DETERMINATION OF POLYSORBATES BY SPECTROPHOTOMETRY IN DRUGS BASED ON RECOMBINANT PROTEINS

Method of determination of polysorbate 20 and polysorbate 80 in recombinant protein drugs based on spectrophotometry has been designed. Isolation of polysorbate from solution is carried out by solid phase extraction followed by elution of polysorbate with acetonitrile. Acetonitrile solution is evaporated and then polysorbate is derivatized with ferrous-thiocyanate reagent. Obtained derivative is extracted into organic phase and optical density is measured. The most optimal conditions of derivatization, extraction into organic phase and measurment was chosen. The validation was performed: specificity, linearity, accuracy, precision, robustness, limit of quantification

Prevalence and genetic diversity of group a rotavirus genotypes in moscow (2019–2020)

Group A rotavirus (RVA) infection is the leading cause of hospitalization of children under 5 years old, presenting with symptoms of acute gastroenteritis. The aim of our study was to explore the genetic diversity of RVA among patients admitted to Moscow Infectious Disease Clinical Hospital No. 1 with symptoms of acute gastroenteritis. A total of 653 samples were collected from May 2019 through March 2020. Out of them, 135 (20.67%) fecal samples were found to be positive for rotavirus antigen by ELISA. RT-PCR detected rotavirus RNA in 80 samples. Seven G-genotypes (G1, G2, G3, G4, G8, G9, and G12) and three P-genotypes (P[8], P[4], and P[6]) formed 9 different combinations. The most common combination was G9P[8]. However, for the first time in Moscow, the combination G3P[8] took second place. Moreover, all detected viruses of this combination belonged to Equine-like G3P[8] viruses that had never been detected in Russia before. The genotype G8P[8] and G9P[4] rotaviruses were also detected in Moscow for the first time. Among the studied rotaviruses, there were equal proportions of Wa and DS-1-like strains; previous studies showed that Wa-like strains accounted for the largest proportion of rotaviruses in Russia. © 2021 by the authors. Licensee MDPI, Basel, Switzerland

Разработка метода определения биологической активности препаратов эритропоэтина in vitro

The method for the assessment of biological activity of erythropoietin preparations in vitro on TF-1 sensitive cells culture has been developed. The special characteristics of measurements and calculations of the biological activity of erythropoietin with different levels of glycosylation in vivo and in vitro. Linear response ranges for cell lines to erythropoietin and its hyperglycosylated analogue differ and make (0.39-0.56 ng/ml) and (3.1-12.5 ng/ml), respectively. The results have shown the possibility of using cellular test for comparing and assaying the activity of erythropoietin analogues in standard international units of biological activity (IU) set for erythropoietin.Разработан метод оценки биологической активности препаратов эритропоэтина in vitro на культуре чувствительных клеток TF-1. Исследованы особенности измерения и расчета биологической активности эритропоэтинов с различным уровнем гликозилирования в тестах in vivo и in vitro. Диапазоны линейного ответа клеточной линии на эритропоэтин и его гипергликозилированный аналог отличались и составляли (0,39-0,56 нг/мл) и (3,1-12,5 нг/мл) соответственно. Проведенный анализ полученных результатов показывает возможность применения клеточного теста для сопоставления и количественной оценки активности аналогов эритропоэтина в международных единицах стандарта биологической активности (МЕ), принятых для эритропоэтина