Pavel Laktionov - Academia.edu (original) (raw)
Papers by Pavel Laktionov
International Journal of Molecular Sciences
To vectorize drug delivery from electrospun-produced scaffolds, we introduce a thin outer drug re... more To vectorize drug delivery from electrospun-produced scaffolds, we introduce a thin outer drug retention layer produced by electrospinning from activated carbon nanoparticles (ACNs)-enriched polycaprolacton (PCL) suspension. Homogeneous or coaxial fibers filled with ACNs were produced by electrospinning from different PCL-based suspensions. Stable ACN suspensions were selected by sorting through solvents, stabilizers and auxiliary components. The ACN-enriched scaffolds produced were characterized for fiber diameter, porosity, pore size and mechanical properties. The scaffold structure was analyzed by scanning electron microscopy and X-ray photoelectron spectroscopy. It was found that ACNs were mainly coated with a polymer layer for both homogeneous and coaxial fibers. Drug binding and release from the scaffolds were tested using tritium-labeled sirolimus. We showed that the kinetics of sirolimus binding/release by ACN-enriched scaffolds was determined by the fiber composition and di...
Polymers
It was previously shown that polycaprolactone (PCL)-based electrospun-produced paclitaxel (PTX)-e... more It was previously shown that polycaprolactone (PCL)-based electrospun-produced paclitaxel (PTX)-enriched matrices exhibit long-term drug release kinetics and can be used as coatings for drug-eluting stents (DES). The installation of vascular stents involves a twofold increase in stent diameter and, therefore, an elongation of the matrices covering the stents, as well as the arterial wall in a stented area. We studied the influence of matrix elongation on its structure and PTX release using three different electrospun-produced matrices. The data obtained demonstrate that matrix elongation during stent installation does not lead to fiber breaks and does not interfere with the kinetics of PTX release. To study PTX diffusion through the expanded artery wall, stents coated with 5%PCL/10%HSA/3%DMSO/PTX and containing tritium-labeled PTX were installed into the freshly obtained iliac artery of a rabbit. The PTX passing through the artery wall was quantified using a scintillator β-counter. ...
Polymers
The authors wish to make a change to the published paper [...]
Diagnostics, 2020
MiRNAs of blood and urine have been shown to represent a convenient source of biomarkers for pros... more MiRNAs of blood and urine have been shown to represent a convenient source of biomarkers for prostate cancer (PCa) diagnosis and assessment of the therapy effectiveness due to their high stability and representation and the low invasiveness of sample collection. Here, we studied the influence of radical prostatectomy (RP) on the expression of 12 cell-free miRNAs previously shown as potential markers of PCa (i.e., miR-19b, miR-22, miR-92a, miR-378, miR-425, miR-30e, miR-31, miR-125b, miR-200b, miR-205, miR-375 and miR-660). The relative expression of the miRNAs combined into 31 paired ratios was evaluated in the urine extracellular vesicles (EVs), clarified urine (CU) and blood plasma of healthy donors, pre- and post-RP samples of PCa patients. Nineteen miRNA ratios based on combinations of ten of the miRNAs (miR-19b, miR-30e, miR-31, miR-125b, miR-200b, miR-205, miR-375, miR-378, miR-425, and miR-660) were altered by RP. The comparative expression analysis of the cell-free miRNA rat...
Polymers, 2020
A stenting procedure aimed at blood flow restoration in stenosed arteries significantly improves ... more A stenting procedure aimed at blood flow restoration in stenosed arteries significantly improves the efficiency of vascular surgery. However, the current challenge is to prevent neointimal growth, which reduces the vessel lumen, in the stented segments in the long run. We tested in vivo drug-eluting coating applied by electrospinning to metal vascular stents to inhibit the overgrowth of neointimal cells via both the drug release and mechanical support of the vascular wall. The blend of polycaprolactone with human serum albumin and paclitaxel was used for stent coating by electrospinning. The drug-eluting stents (DESs) were placed using a balloon catheter to the rabbit common iliac artery for 1, 3, and 6 months. The blood flow rate was ultrasonically determined in vivo. After explantation, the stented arterial segment was visually and histologically examined. Any undesirable biological responses (rejection or hemodynamically significant stenosis) were unobservable in the experimental...
Diagnostics, 2020
Prostate cancer is a global biological, medical, and social issue aggravated by the lack of relia... more Prostate cancer is a global biological, medical, and social issue aggravated by the lack of reliable, highly specific, and sensitive non-invasive tests for diagnosis and staging of prostate cancer. One prospective source of biomarkers are the cell-free miRNAs present in various biological fluids. In the present study, we validated the diagnostic potential of cell-free miRNAs: miR-19b, miR-22, miR-92a, miR-378, miR-425, miR-30e, miR-31, miR-125b, miR-200b, miR-205, miR-375, and miR-660; we estimated the required sample size and the minimal miRNA set for a subsequent large-scale validation study. Relative expression of 12 miRNA combined in 31 ratios was investigated in three fractions of biological fluids (urine extracellular vesicles, clarified urine, and plasma) obtained from patients with prostate cancer (n = 10), benign prostate hyperplasia (n = 8), and healthy volunteers (n = 11). Eight of the miRNAs found in urine vesicles (miR-19b, miR-30e, miR-31, miR-92a, miR-125, miR-200, mi...
Cardiovascular Therapy and Prevention, 2020
Эндоваскулярные вмешательства доказали свою эффективность в лечении поражений бедренно-подколенно... more Эндоваскулярные вмешательства доказали свою эффективность в лечении поражений бедренно-подколенного артериального сегмента. Большое количество опубликованных научных работ свидетельствует о сохраняющейся актуальности и перспективе этого направления в настоящее время. В статье представлен анализ исследований за последние 5 лет о разных способах лечения, результаты применения баллонов и стентов с цитостатическими покрытиями. Предложены пути улучшения результатов интервенционных вмешательств на бедренно-подколенном сегменте.
Acta Naturae, 2015
A direct correlation between the concentration of cell-free and cell-surface-bound circulating DN... more A direct correlation between the concentration of cell-free and cell-surface-bound circulating DNA (cfDNA and csbDNA, respectively) was demonstrated. Based on an inverse correlation between blood plasma DNase activity and the cfDNA concentration, blood DNases are supposed to regulate the cfDNA concentration. However, no correlation was found between the DNase activity in blood plasma and the csbDNA concentration, indicating that blood DNases are not involved in csbDNA dissociation from the cell surface. The possibility of DNA redistribution between cfDNA and csbDNA indicates that the total pool of circulating DNA (cfDNA +csbDNA) should be used for a correct analysis of marker DNA concentrations and data standardization.
PLOS ONE, 2019
The connective tissue components that form the atherosclerotic plaque body are produced by the pl... more The connective tissue components that form the atherosclerotic plaque body are produced by the plaque inner mass cells (PIMC), located inside the plaque. We report an approach to isolate and culture cells from the connective tissue of stable and vulnerable human atherosclerotic plaques based on elimination of non-connective tissue cells such as blood and non-plaque intima cells with a lysis buffer. The resulting plaque cells were characterized by growth capacity, morphology, transcriptome profiling and specific protein expression. Plaque cells slowly proliferated for up to three passages unaffected by the use of proliferation stimulants or changes of culture media composition. Stable plaques yielded more cells than vulnerable ones. Plaque cell cultures also contained several morphological cellular types. RNA-seq profiles of plaque cells were different from any of the cell types known to be involved in atherogenesis. The expression of the following proteins was observed in cultured plaque cells: smooth muscle cells marker α-SMA, macrophage marker CD14, extracellular matrix proteins aggrecan, fibronectin, neovascularisation markers VEGF-A, CD105, cellular adhesion receptor CD31 and progenitor/dedifferentiation receptor CD34. Differential expression of several notable transcripts in cells from stable and vulnerable plaques suggests the value of plaque cell culture studies for the search of plaque vulnerability markers.
Biomeditsinskaya Khimiya, 2018
To increase the sensitivity and specificity of the developed methods for diagnosis of oncological... more To increase the sensitivity and specificity of the developed methods for diagnosis of oncological diseases using exosomes of blood, a stage of pre-selection of tumor exosomes from a common pool of circulating microvesicles is required. In the present work, universal proteins have been identified, their expression has been increased in the exosomes of patients with colorectal cancer, head and neck squamous cell carcinomas, and lung cancer. The use of antibodies against major exosomal proteins will further develop a simple and high-performance method of affinity isolation of tumor exosomes.
PLOS ONE, 2019
Urine of prostate cancer (PCa) carries miRNAs originated from prostate cancer cells as a part of ... more Urine of prostate cancer (PCa) carries miRNAs originated from prostate cancer cells as a part of both nucleoprotein complexes and cell-secreted extracellular vesicles. The analysis of such miRNA-markers in urine can be a convenient option for PCa screening. The aims of this study were to reveal miRNA-markers of PCa in urine and design a robust and precise diagnostic test, based on miRNA expression analysis. The expression analysis of the 84 miRNAs in paired urine extracellular vesicles (EVs) and cell free urine supernatant samples from healthy donors, patients with benign and malignant prostate tumours was done using miRCURY LNA miRNA qPCR Panels (Exiqon, Denmark). Sets of miRNAs differentially expressed between the donor groups were found in urine EVs and urine supernatant. Diagnostically significant miRNAs were selected and algorithm of data analysis, based on expression data on 24-miRNA in urine and obtained using 17 analytical systems, was designed. The developed algorithm of data analysis describes a series of steps necessary to define cutoff values and sequentially analyze miRNA expression data according to the cutoffs to facilitate classification of subjects in case/control groups and allows to detect PCa patients with 97.5% accuracy.
Biomeditsinskaya Khimiya, 2018
Urine of prostate cancer patients contains tumor-specific biopolymers, including protein- and mic... more Urine of prostate cancer patients contains tumor-specific biopolymers, including protein- and microvesiclesassociated miRNAs that can potentially be used as oncomarkers. Previously we have characterized urine extracellular vesicles and demonstrated diagnostic potential of their miRNA cargo. In this study, we have performed a comparative analysis of the expression of 84 miRNA in paired samples of urine microvesicles and clarified urine from healthy men, patients with benign hyperplasia and cancer of the prostate using miRCURY LNA miRNA qPCR Panels. Subsets of miRNAs with differences in expression between the fractions of the urine were found in all three groups. Two groups of miRNA were identified based on the patterns of their differential expression. They regulate several key signaling pathways associated with prostate cancer development.
Scientific Reports, 2018
Lung cancer is one of major cancers, and survival of lung cancer patients is dictated by the time... more Lung cancer is one of major cancers, and survival of lung cancer patients is dictated by the timely detection and diagnosis. Cell-free circulating miRNAs were proposed as candidate biomarkers for lung cancer. These RNAs are frequently deregulated in lung cancer and can persist in bodily fluids for extended periods of time, shielded from degradation by membrane vesicles and biopolymer complexes. To date, several groups reported the presence of lung tumour-specific subsets of miRNAs in blood. Here we describe the profiling of blood plasma miRNAs in lung cancer patients, healthy individuals and endobronchitis patients using miRCURY LNA miRNA qPCR Serum/Plasma Panel (Exiqon). From 241 ratios differently expressed between cancer patients and healthy individuals 19 miRNAs were selected for verification using the same platform. LASSO-penalized logistic regression model, including 10 miRNA ratios comprised of 14 individual miRNAs discriminated lung cancer patients from both control groups w...
Meccanica, 2018
The study is devoted to the geometrically nonlinear simulation of fiber-reinforced composite stru... more The study is devoted to the geometrically nonlinear simulation of fiber-reinforced composite structures. The applicability of the multiplicative approach to the simulation of viscoelastic properties of a composite material is assessed, certain improvements are suggested. For a greater accuracy in applications involving local compressive fiber buckling, a new family of hyperelastic potentials is introduced. This family allows us to account for the variable critical compressive stress, which depends on the fibermatrix interaction. For the simulation of viscoelasticity, the well-established Sidoroff decomposition of the deformation gradient is implemented. To account for the viscosity of the matrix material, the model of Simo and Miehe (1992) is used; highly efficient iteration-free algorithms are implemented. The viscosity of the fiber is likewise described by the multiplicative decomposition of the deformation gradient, leading to a scalar differential equation; an efficient iteration-free algorithm is proposed for the implicit time stepping. The accuracy and convergence of the new iteration-free method is tested and compared to that of the standard scheme implementing the Newton iteration. To demonstrate the applicability of the approach, a pressurized multi-layer composite pipe is modelled; the so-called stretch inversion phenomenon is reproduced and explained. The stress distribution is obtained by a semi-analytical procedure; it may serve as a benchmark for FEM computations. Finally, the issue of the parameter identification is addressed.
Биологические мембраны: Журнал мембранной и клеточной биологии, 2016
Annals of Oncology, 2016
migratory behaviors of the cells were determined by FACS and migration assay before and after tre... more migratory behaviors of the cells were determined by FACS and migration assay before and after treatment with curcumin. The expression levels of survivin, CyclinD1, MMP3, MMP9, P65, P21, Nf-kB, and E-cadherin were studied by quantitative RT-PCR and/or western blot. Results: Ccurcumin suppressed cell growth in MCF-7 cells at 110uM IC50 value. The median drug-effect analysis showed a slight-to-moderate synergism with CI values of 0.8. Curcumin was able to reduce the invasiveness of MCF-7, compared to control cells. Moreover, curcumin inhibited the tumor growth in MCF-7 cells, although this inhibition was more pronounced with amorphous/phospholipidated curcumin. Additionally, curcumin significantly (P < 0.05) increased the percentages of the cells in S and G2/M phases (e.g., from 15.2 in the control to 18.4% in the S phase) after 72 hours, while reducing the percentage of the cells in G0/G1. Analysis of the sub-G1 region of cell cycle analysis revealed that the treatment with curcumin increased cell death through modulation of NF-kB pathways. Conclusions: We demonstrated the antitumor activity of curcumin and its curcumin oleoresin in a breast cancer cell line, supporting further investigations on the therapeutic potential of this novel anticancer agent in in vivo models. Legal entity responsible for the study: N/A
PLOS ONE, 2016
Lung cancer is a complex disease that often manifests at the point when treatment is not effectiv... more Lung cancer is a complex disease that often manifests at the point when treatment is not effective. Introduction of blood-based complementary diagnostics using molecular markers may enhance early detection of this disease and help reduce the burden of lung cancer. Here we evaluated the diagnostic potential of seven plasma miRNA biomarkers (miR-21,-19b,-126,-25,-205,-183,-125b) by quantitative reverse transcription PCR. Influence clinical and demographical characteristics, including age, tumor stage and cancer subtype on miRNA levels was investigated. Four miRNAs were significantly dysregulated (miR-19b,-21,-25,-183) in lung cancer patients. Combination of miR-19b and miR-183 provided detection of lung cancer with 94.7% sensitivity and 95.2% specificity (AUC = 0.990). Thus, miRNAs have shown the potential to discriminate histological subtypes of lung cancer and reliably distinguish lung cancer patients from healthy individuals.
European Journal of Cancer Supplements, 2015
In addition to flow cytometry we want to show how modern microscopes help to perform a variety of... more In addition to flow cytometry we want to show how modern microscopes help to perform a variety of routine and specialty applications.
Biomeditsinskaya Khimiya, 2016
Exosomes represent a sort of extracellular vesicles, which transfer molecular signals in organism... more Exosomes represent a sort of extracellular vesicles, which transfer molecular signals in organism and possess markers of producing cells. Our study was aimed at search of exosomes in the tears of healthy humans, confirmation of their nature and examination of exosome morphological and molecular-biological characteristics. The tears (110-340 ml) were collected from 24 healthy donors (aged 46-60 years); individual probes were centrifuged at 20000 g for 15 min to pellet cell debris. The supernatants were examined in electron microscope using negative staining; and they were also used for isolation and purification of the exosomes by filtration (100 nm pore-size) and double ultracentrifugation (90 min at 100000 g, 4°C). The “pellets” were subjected to electron microscopy, immunolabeling. The RNA and DNA were isolated from the samples, and their sizes were evaluated by capillary electrophoresis, the concentration and localization of nucleic acids were determined. Sequencing of DNA was pe...
European Journal of Cancer Supplements, 2015
LINE1 and a-satellite repeats (Bryzgunova, 2011). Results: TEM with immunogold labeling demonstra... more LINE1 and a-satellite repeats (Bryzgunova, 2011). Results: TEM with immunogold labeling demonstrate presence of exosomes in 30-100 nm membrane-wrapped particles isolated from both plasma and CSB eluates. TEM, NanoOrange and 28S rRNA RT-qPCR data demonstrate that CSB exosomes constitutes 2/3 of total blood exosomes. Exosomes ranged 50-70 nm prevail in blood of BCP, whereas 30-50 nm exosomes in blood of HW. Exosomal DNA is less than 0.3% of cell-free blood DNA. RNA integrity and specific quantity checked by Bioanalyzer (Agilent Technologies, USA) do not differ in cell-free and CSB exosomes. Preliminary data demonstrate overpresentation of cancer-specific miRNA (miR-103, miR-191, miR-195) in exosomes bound with erythrocyte's as compared with exosomes bound with leukocytes or circulating in plasma. Conclusion: Exosomal DNA obviously do not have any diagnostic value in contrast to RNA. CSB exosomes represent valuable source of material for small-invasive cancer diagnostics.
International Journal of Molecular Sciences
To vectorize drug delivery from electrospun-produced scaffolds, we introduce a thin outer drug re... more To vectorize drug delivery from electrospun-produced scaffolds, we introduce a thin outer drug retention layer produced by electrospinning from activated carbon nanoparticles (ACNs)-enriched polycaprolacton (PCL) suspension. Homogeneous or coaxial fibers filled with ACNs were produced by electrospinning from different PCL-based suspensions. Stable ACN suspensions were selected by sorting through solvents, stabilizers and auxiliary components. The ACN-enriched scaffolds produced were characterized for fiber diameter, porosity, pore size and mechanical properties. The scaffold structure was analyzed by scanning electron microscopy and X-ray photoelectron spectroscopy. It was found that ACNs were mainly coated with a polymer layer for both homogeneous and coaxial fibers. Drug binding and release from the scaffolds were tested using tritium-labeled sirolimus. We showed that the kinetics of sirolimus binding/release by ACN-enriched scaffolds was determined by the fiber composition and di...
Polymers
It was previously shown that polycaprolactone (PCL)-based electrospun-produced paclitaxel (PTX)-e... more It was previously shown that polycaprolactone (PCL)-based electrospun-produced paclitaxel (PTX)-enriched matrices exhibit long-term drug release kinetics and can be used as coatings for drug-eluting stents (DES). The installation of vascular stents involves a twofold increase in stent diameter and, therefore, an elongation of the matrices covering the stents, as well as the arterial wall in a stented area. We studied the influence of matrix elongation on its structure and PTX release using three different electrospun-produced matrices. The data obtained demonstrate that matrix elongation during stent installation does not lead to fiber breaks and does not interfere with the kinetics of PTX release. To study PTX diffusion through the expanded artery wall, stents coated with 5%PCL/10%HSA/3%DMSO/PTX and containing tritium-labeled PTX were installed into the freshly obtained iliac artery of a rabbit. The PTX passing through the artery wall was quantified using a scintillator β-counter. ...
Polymers
The authors wish to make a change to the published paper [...]
Diagnostics, 2020
MiRNAs of blood and urine have been shown to represent a convenient source of biomarkers for pros... more MiRNAs of blood and urine have been shown to represent a convenient source of biomarkers for prostate cancer (PCa) diagnosis and assessment of the therapy effectiveness due to their high stability and representation and the low invasiveness of sample collection. Here, we studied the influence of radical prostatectomy (RP) on the expression of 12 cell-free miRNAs previously shown as potential markers of PCa (i.e., miR-19b, miR-22, miR-92a, miR-378, miR-425, miR-30e, miR-31, miR-125b, miR-200b, miR-205, miR-375 and miR-660). The relative expression of the miRNAs combined into 31 paired ratios was evaluated in the urine extracellular vesicles (EVs), clarified urine (CU) and blood plasma of healthy donors, pre- and post-RP samples of PCa patients. Nineteen miRNA ratios based on combinations of ten of the miRNAs (miR-19b, miR-30e, miR-31, miR-125b, miR-200b, miR-205, miR-375, miR-378, miR-425, and miR-660) were altered by RP. The comparative expression analysis of the cell-free miRNA rat...
Polymers, 2020
A stenting procedure aimed at blood flow restoration in stenosed arteries significantly improves ... more A stenting procedure aimed at blood flow restoration in stenosed arteries significantly improves the efficiency of vascular surgery. However, the current challenge is to prevent neointimal growth, which reduces the vessel lumen, in the stented segments in the long run. We tested in vivo drug-eluting coating applied by electrospinning to metal vascular stents to inhibit the overgrowth of neointimal cells via both the drug release and mechanical support of the vascular wall. The blend of polycaprolactone with human serum albumin and paclitaxel was used for stent coating by electrospinning. The drug-eluting stents (DESs) were placed using a balloon catheter to the rabbit common iliac artery for 1, 3, and 6 months. The blood flow rate was ultrasonically determined in vivo. After explantation, the stented arterial segment was visually and histologically examined. Any undesirable biological responses (rejection or hemodynamically significant stenosis) were unobservable in the experimental...
Diagnostics, 2020
Prostate cancer is a global biological, medical, and social issue aggravated by the lack of relia... more Prostate cancer is a global biological, medical, and social issue aggravated by the lack of reliable, highly specific, and sensitive non-invasive tests for diagnosis and staging of prostate cancer. One prospective source of biomarkers are the cell-free miRNAs present in various biological fluids. In the present study, we validated the diagnostic potential of cell-free miRNAs: miR-19b, miR-22, miR-92a, miR-378, miR-425, miR-30e, miR-31, miR-125b, miR-200b, miR-205, miR-375, and miR-660; we estimated the required sample size and the minimal miRNA set for a subsequent large-scale validation study. Relative expression of 12 miRNA combined in 31 ratios was investigated in three fractions of biological fluids (urine extracellular vesicles, clarified urine, and plasma) obtained from patients with prostate cancer (n = 10), benign prostate hyperplasia (n = 8), and healthy volunteers (n = 11). Eight of the miRNAs found in urine vesicles (miR-19b, miR-30e, miR-31, miR-92a, miR-125, miR-200, mi...
Cardiovascular Therapy and Prevention, 2020
Эндоваскулярные вмешательства доказали свою эффективность в лечении поражений бедренно-подколенно... more Эндоваскулярные вмешательства доказали свою эффективность в лечении поражений бедренно-подколенного артериального сегмента. Большое количество опубликованных научных работ свидетельствует о сохраняющейся актуальности и перспективе этого направления в настоящее время. В статье представлен анализ исследований за последние 5 лет о разных способах лечения, результаты применения баллонов и стентов с цитостатическими покрытиями. Предложены пути улучшения результатов интервенционных вмешательств на бедренно-подколенном сегменте.
Acta Naturae, 2015
A direct correlation between the concentration of cell-free and cell-surface-bound circulating DN... more A direct correlation between the concentration of cell-free and cell-surface-bound circulating DNA (cfDNA and csbDNA, respectively) was demonstrated. Based on an inverse correlation between blood plasma DNase activity and the cfDNA concentration, blood DNases are supposed to regulate the cfDNA concentration. However, no correlation was found between the DNase activity in blood plasma and the csbDNA concentration, indicating that blood DNases are not involved in csbDNA dissociation from the cell surface. The possibility of DNA redistribution between cfDNA and csbDNA indicates that the total pool of circulating DNA (cfDNA +csbDNA) should be used for a correct analysis of marker DNA concentrations and data standardization.
PLOS ONE, 2019
The connective tissue components that form the atherosclerotic plaque body are produced by the pl... more The connective tissue components that form the atherosclerotic plaque body are produced by the plaque inner mass cells (PIMC), located inside the plaque. We report an approach to isolate and culture cells from the connective tissue of stable and vulnerable human atherosclerotic plaques based on elimination of non-connective tissue cells such as blood and non-plaque intima cells with a lysis buffer. The resulting plaque cells were characterized by growth capacity, morphology, transcriptome profiling and specific protein expression. Plaque cells slowly proliferated for up to three passages unaffected by the use of proliferation stimulants or changes of culture media composition. Stable plaques yielded more cells than vulnerable ones. Plaque cell cultures also contained several morphological cellular types. RNA-seq profiles of plaque cells were different from any of the cell types known to be involved in atherogenesis. The expression of the following proteins was observed in cultured plaque cells: smooth muscle cells marker α-SMA, macrophage marker CD14, extracellular matrix proteins aggrecan, fibronectin, neovascularisation markers VEGF-A, CD105, cellular adhesion receptor CD31 and progenitor/dedifferentiation receptor CD34. Differential expression of several notable transcripts in cells from stable and vulnerable plaques suggests the value of plaque cell culture studies for the search of plaque vulnerability markers.
Biomeditsinskaya Khimiya, 2018
To increase the sensitivity and specificity of the developed methods for diagnosis of oncological... more To increase the sensitivity and specificity of the developed methods for diagnosis of oncological diseases using exosomes of blood, a stage of pre-selection of tumor exosomes from a common pool of circulating microvesicles is required. In the present work, universal proteins have been identified, their expression has been increased in the exosomes of patients with colorectal cancer, head and neck squamous cell carcinomas, and lung cancer. The use of antibodies against major exosomal proteins will further develop a simple and high-performance method of affinity isolation of tumor exosomes.
PLOS ONE, 2019
Urine of prostate cancer (PCa) carries miRNAs originated from prostate cancer cells as a part of ... more Urine of prostate cancer (PCa) carries miRNAs originated from prostate cancer cells as a part of both nucleoprotein complexes and cell-secreted extracellular vesicles. The analysis of such miRNA-markers in urine can be a convenient option for PCa screening. The aims of this study were to reveal miRNA-markers of PCa in urine and design a robust and precise diagnostic test, based on miRNA expression analysis. The expression analysis of the 84 miRNAs in paired urine extracellular vesicles (EVs) and cell free urine supernatant samples from healthy donors, patients with benign and malignant prostate tumours was done using miRCURY LNA miRNA qPCR Panels (Exiqon, Denmark). Sets of miRNAs differentially expressed between the donor groups were found in urine EVs and urine supernatant. Diagnostically significant miRNAs were selected and algorithm of data analysis, based on expression data on 24-miRNA in urine and obtained using 17 analytical systems, was designed. The developed algorithm of data analysis describes a series of steps necessary to define cutoff values and sequentially analyze miRNA expression data according to the cutoffs to facilitate classification of subjects in case/control groups and allows to detect PCa patients with 97.5% accuracy.
Biomeditsinskaya Khimiya, 2018
Urine of prostate cancer patients contains tumor-specific biopolymers, including protein- and mic... more Urine of prostate cancer patients contains tumor-specific biopolymers, including protein- and microvesiclesassociated miRNAs that can potentially be used as oncomarkers. Previously we have characterized urine extracellular vesicles and demonstrated diagnostic potential of their miRNA cargo. In this study, we have performed a comparative analysis of the expression of 84 miRNA in paired samples of urine microvesicles and clarified urine from healthy men, patients with benign hyperplasia and cancer of the prostate using miRCURY LNA miRNA qPCR Panels. Subsets of miRNAs with differences in expression between the fractions of the urine were found in all three groups. Two groups of miRNA were identified based on the patterns of their differential expression. They regulate several key signaling pathways associated with prostate cancer development.
Scientific Reports, 2018
Lung cancer is one of major cancers, and survival of lung cancer patients is dictated by the time... more Lung cancer is one of major cancers, and survival of lung cancer patients is dictated by the timely detection and diagnosis. Cell-free circulating miRNAs were proposed as candidate biomarkers for lung cancer. These RNAs are frequently deregulated in lung cancer and can persist in bodily fluids for extended periods of time, shielded from degradation by membrane vesicles and biopolymer complexes. To date, several groups reported the presence of lung tumour-specific subsets of miRNAs in blood. Here we describe the profiling of blood plasma miRNAs in lung cancer patients, healthy individuals and endobronchitis patients using miRCURY LNA miRNA qPCR Serum/Plasma Panel (Exiqon). From 241 ratios differently expressed between cancer patients and healthy individuals 19 miRNAs were selected for verification using the same platform. LASSO-penalized logistic regression model, including 10 miRNA ratios comprised of 14 individual miRNAs discriminated lung cancer patients from both control groups w...
Meccanica, 2018
The study is devoted to the geometrically nonlinear simulation of fiber-reinforced composite stru... more The study is devoted to the geometrically nonlinear simulation of fiber-reinforced composite structures. The applicability of the multiplicative approach to the simulation of viscoelastic properties of a composite material is assessed, certain improvements are suggested. For a greater accuracy in applications involving local compressive fiber buckling, a new family of hyperelastic potentials is introduced. This family allows us to account for the variable critical compressive stress, which depends on the fibermatrix interaction. For the simulation of viscoelasticity, the well-established Sidoroff decomposition of the deformation gradient is implemented. To account for the viscosity of the matrix material, the model of Simo and Miehe (1992) is used; highly efficient iteration-free algorithms are implemented. The viscosity of the fiber is likewise described by the multiplicative decomposition of the deformation gradient, leading to a scalar differential equation; an efficient iteration-free algorithm is proposed for the implicit time stepping. The accuracy and convergence of the new iteration-free method is tested and compared to that of the standard scheme implementing the Newton iteration. To demonstrate the applicability of the approach, a pressurized multi-layer composite pipe is modelled; the so-called stretch inversion phenomenon is reproduced and explained. The stress distribution is obtained by a semi-analytical procedure; it may serve as a benchmark for FEM computations. Finally, the issue of the parameter identification is addressed.
Биологические мембраны: Журнал мембранной и клеточной биологии, 2016
Annals of Oncology, 2016
migratory behaviors of the cells were determined by FACS and migration assay before and after tre... more migratory behaviors of the cells were determined by FACS and migration assay before and after treatment with curcumin. The expression levels of survivin, CyclinD1, MMP3, MMP9, P65, P21, Nf-kB, and E-cadherin were studied by quantitative RT-PCR and/or western blot. Results: Ccurcumin suppressed cell growth in MCF-7 cells at 110uM IC50 value. The median drug-effect analysis showed a slight-to-moderate synergism with CI values of 0.8. Curcumin was able to reduce the invasiveness of MCF-7, compared to control cells. Moreover, curcumin inhibited the tumor growth in MCF-7 cells, although this inhibition was more pronounced with amorphous/phospholipidated curcumin. Additionally, curcumin significantly (P < 0.05) increased the percentages of the cells in S and G2/M phases (e.g., from 15.2 in the control to 18.4% in the S phase) after 72 hours, while reducing the percentage of the cells in G0/G1. Analysis of the sub-G1 region of cell cycle analysis revealed that the treatment with curcumin increased cell death through modulation of NF-kB pathways. Conclusions: We demonstrated the antitumor activity of curcumin and its curcumin oleoresin in a breast cancer cell line, supporting further investigations on the therapeutic potential of this novel anticancer agent in in vivo models. Legal entity responsible for the study: N/A
PLOS ONE, 2016
Lung cancer is a complex disease that often manifests at the point when treatment is not effectiv... more Lung cancer is a complex disease that often manifests at the point when treatment is not effective. Introduction of blood-based complementary diagnostics using molecular markers may enhance early detection of this disease and help reduce the burden of lung cancer. Here we evaluated the diagnostic potential of seven plasma miRNA biomarkers (miR-21,-19b,-126,-25,-205,-183,-125b) by quantitative reverse transcription PCR. Influence clinical and demographical characteristics, including age, tumor stage and cancer subtype on miRNA levels was investigated. Four miRNAs were significantly dysregulated (miR-19b,-21,-25,-183) in lung cancer patients. Combination of miR-19b and miR-183 provided detection of lung cancer with 94.7% sensitivity and 95.2% specificity (AUC = 0.990). Thus, miRNAs have shown the potential to discriminate histological subtypes of lung cancer and reliably distinguish lung cancer patients from healthy individuals.
European Journal of Cancer Supplements, 2015
In addition to flow cytometry we want to show how modern microscopes help to perform a variety of... more In addition to flow cytometry we want to show how modern microscopes help to perform a variety of routine and specialty applications.
Biomeditsinskaya Khimiya, 2016
Exosomes represent a sort of extracellular vesicles, which transfer molecular signals in organism... more Exosomes represent a sort of extracellular vesicles, which transfer molecular signals in organism and possess markers of producing cells. Our study was aimed at search of exosomes in the tears of healthy humans, confirmation of their nature and examination of exosome morphological and molecular-biological characteristics. The tears (110-340 ml) were collected from 24 healthy donors (aged 46-60 years); individual probes were centrifuged at 20000 g for 15 min to pellet cell debris. The supernatants were examined in electron microscope using negative staining; and they were also used for isolation and purification of the exosomes by filtration (100 nm pore-size) and double ultracentrifugation (90 min at 100000 g, 4°C). The “pellets” were subjected to electron microscopy, immunolabeling. The RNA and DNA were isolated from the samples, and their sizes were evaluated by capillary electrophoresis, the concentration and localization of nucleic acids were determined. Sequencing of DNA was pe...
European Journal of Cancer Supplements, 2015
LINE1 and a-satellite repeats (Bryzgunova, 2011). Results: TEM with immunogold labeling demonstra... more LINE1 and a-satellite repeats (Bryzgunova, 2011). Results: TEM with immunogold labeling demonstrate presence of exosomes in 30-100 nm membrane-wrapped particles isolated from both plasma and CSB eluates. TEM, NanoOrange and 28S rRNA RT-qPCR data demonstrate that CSB exosomes constitutes 2/3 of total blood exosomes. Exosomes ranged 50-70 nm prevail in blood of BCP, whereas 30-50 nm exosomes in blood of HW. Exosomal DNA is less than 0.3% of cell-free blood DNA. RNA integrity and specific quantity checked by Bioanalyzer (Agilent Technologies, USA) do not differ in cell-free and CSB exosomes. Preliminary data demonstrate overpresentation of cancer-specific miRNA (miR-103, miR-191, miR-195) in exosomes bound with erythrocyte's as compared with exosomes bound with leukocytes or circulating in plasma. Conclusion: Exosomal DNA obviously do not have any diagnostic value in contrast to RNA. CSB exosomes represent valuable source of material for small-invasive cancer diagnostics.