Evaluating the Effect of Substrates on the Stability of the Bacterial Luminescent System during Co-Immobilization in the Starch Gel

This study presents the evaluation of the effect of the substrates: tetradecanal and NADH on the activity of the coupled enzyme system NAD(P)H: FMN oxidoreductase – luciferase during co-immobilization and long-term storage.Участие в IX Международной молодежной научной конференции «Физика. Техно-логии. Инновации. ФТИ-2022» поддержано Красноярским краевым фондом науки

Оценка противоопухолевых, токсических эффектов и характера экспрессии генов-мишеней miR-204-5p при применении ее имитатора на модели меланомы В-16 in vivo

Objective. To evaluate anti-tumor, toxic effect of miR-204-5p mimic applicaton on melanoma B-16-bearing mice followed by miR-204-5p target gene expression estimation in melanoma tumor and distant organs. Material and Methods. C57Bl/6 melanoma B-16-bearing mice were used. The animals of the experimental group were intraperitoneally injected with a 5 nM miR-204-5p miRNA simulator (mimic) on the 8th, 10th, and 12th days after melanoma B-16 cell transplantation. Based on the results of bioinformatic analysis, miR-204-5p target genes BCL2 and SIRT1 expression levels were determined by quantitative real-time PCR. The toxic effect of miR-204-5p mimic was estimated by the evaluation of body weight, mass of the internal organs, and motor activity. Results. On the 13-14th days of the experiment, the motor activity of animals in the control groups decreased signifcantly compared to the group of animals treated by miR-204-5p. Target gene BCL2 showed increased expression in the lungs and kidneys and SIRT1 levels were increased in the lungs of miR-204-5p mimic treated animals (p˂0.05). Tumor mass tended to decrease in the animals treated by miR-204-5p mimic. Conclusion. Modulation of the level of miR-204-5p microRNA led to changes in the expression of SIRT1 and BCL2 in the lungs of animals, and changes in the expression of BCL2in the kidneys. MiR-204-5p mimic application did not have toxic effect on animals treated. Further studies are necessary to clarify miR-204-5p implication in melanoma cell proliferation regulation as well as it’s biodistibution in the tumor tissue.Цель исследования – оценка влияния имитатора miR-204-5p на рост меланомы В-16 in vivo при внутрибрюшинном трехкратном его введении, определение изменения при этом экспрессии генов-мишеней miR-204-5p в опухоли и дистантных органах, а также выраженности токсических реакций.Материал и методы. Исследование проводили на мышах C57Bl/6 с подкожно перевитой меланомой B-16. Животным опытной группы внутрибрюшинно вводили имитатор микроРНК miR-204-5p (5нМоль) на 8, 10, 12-е сут после трансплантации опухолевых клеток. Согласно результатам биоинформатического анализа определяли уровень экспрессии генов-мишеней микроРНК BCL2 и SIRT1 методом ПЦР в реальном времени. Определяли токсический эффект воздействия имитатора по динамике массы тела и органов, объему опухолевого узла, изменению двигательной активности и внешнего вида животных в течение эксперимента.Результаты. Оценка внешних признаков и динамики двигательной активности животных, а также динамики их массы и массы органов при вскрытии свидетельствует об отсутствии токсического эффекта имитатора miR-204-5p. К 13–14-му дню эксперимента двигательная активность в контрольных группах животных статистически значимо снизилась по сравнению с группой животных, которым вводился имитатор miR-204-5p (р=0,011) Отмечено повышение экспрессии BCL2 в легких и почках мышей и SIRT1 – в легких мышей (p˂0,05). Отмечалась тенденция к снижению массы опухолевого узла к 14-му дню эксперимента.Заключение. Модуляция уровня микроРНК miR-204-5p приводит к изменению экспрессии генов-мишеней – SIRT1 и BCL2 в легких животных, BCL2 – в почках. Введение имитатора микроРНК не вызывает нарушений двигательной активности животных, изменения массы внутренних органов, что может свидетельствовать об отсутствии развития токсического эффекта. Дальнейшее исследование требуется для разъяснения биодоступности модуляторов микроРНК в опухолевую ткань, а также влияния имитатора miR-204-5p на пролиферацию клеток меланомы in vivo

Applications of luminous bacteria enzymes in toxicology

This review describes the principle and applications of bioluminescent enzymatic toxicity bioassays. This type of assays uses bacterial coupled enzyme systems: NADH:FMN-oxidoreductase and luciferase to replace living organisms in developing cost-competitive biosensors for environmental, medical and industrial applications. These biosensors instantly signal chemical and biological hazards and allow for detecting a great amount of toxic compounds with advantages associated with fast results, high sensitivity, simplicity, low cost and safety of the procedure

Applications of luminous bacteria enzymes in toxicology

This review describes the principle and applications of bioluminescent enzymatic toxicity bioassays. This type of assays uses bacterial coupled enzyme systems: NADH:FMN-oxidoreductase and luciferase to replace living organisms in developing cost-competitive biosensors for environmental, medical and industrial applications. These biosensors instantly signal chemical and biological hazards and allow for detecting a great amount of toxic compounds with advantages associated with fast results, high sensitivity, simplicity, low cost and safety of the procedure

NAD(P)H:FMN-oxidoreductase functioning under macromolecular crowding: in vitro modeling

Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала

Rapid biosensing tools for cancer biomarkers

Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.The present review critically discusses the latest developments in the field of smart diagnostic systems for cancer biomarkers. A wide coverage of recent biosensing approaches involving aptamers, enzymes, DNA probes, fluorescent probes, interacting proteins and antibodies in vicinity to transducers such as electrochemical, optical and piezoelectric is presented. Recent advanced developments in biosensing approaches for cancer biomarker owes much credit to functionalized nanomaterials due to their unique opto-electronic properties and enhanced surface to volume ratio. Biosensing methods for a plenty of cancer biomarkers has been summarized emphasizing the key principles involved

Rapid biosensing tools for cancer biomarkers

Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.The present review critically discusses the latest developments in the field of smart diagnostic systems for cancer biomarkers. A wide coverage of recent biosensing approaches involving aptamers, enzymes, DNA probes, fluorescent probes, interacting proteins and antibodies in vicinity to transducers such as electrochemical, optical and piezoelectric is presented. Recent advanced developments in biosensing approaches for cancer biomarker owes much credit to functionalized nanomaterials due to their unique opto-electronic properties and enhanced surface to volume ratio. Biosensing methods for a plenty of cancer biomarkers has been summarized emphasizing the key principles involved

Impact of enzyme stabilizers on the characteristics of biomodules for bioluminescent biosensors

Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.The biomodule of bioluminescent biosensor based on a coupled enzyme system NADH:FMN-oxidoreductase and luciferase, co-immobilized with substrates in dried starch or gelatin gels, has been developed. We studied the impact of several stabilizers-dithiothreitol (DTT), bovine serum albumin (BSA) and mercaptoethanol (ME) on the biomodule's activity, storage stability and sensitivity to toxic substances. The inclusion of stabilizers increases the activity of the biological module by more than 150%. To achieve the combination of high activity, prolonged storage time and acute sensitivity to toxic substances within maximum permissible concentration we used starch gel as a carrier adding 100 mu M DTT to the immobilized preparation. The gelatin-based biological module had greater storage stability than the starch-based one but demonstrated less sensitivity to toxic substances. (C) 2015 Elsevier B.V. All rights reserved

Gelatin and starch: What better stabilizes the enzyme activity?

The regularities of the functioning of a number of enzymes in a viscous environment created by natural polymers, starch and gelatin are examined. Based on the analysis of kinetic curves of thermal inactivation, mechanisms of thermal inactivation of enzymes in a viscous microenvironment are proposed. Using the example of butyrylcholinesterase, NAD(P)H:FMN oxidoreductase, and coupled system of the luminous bacteria (NAD(P)H:FMN oxidoreductase + luciferase), the conditions, under which starch and gelatin have a stabilizing effect on enzyme activity during storage and exposure to various physical and chemical environmental factors, were found. A significant increase in the stabilizing effect is achieved by eliminating water during drying the enzyme preparations immobilized in starch and gelatin polymer gels