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Zheleznogorsk, Russia

Tohidpour A.,Krasnoyarsk State Medical University
Microbial Pathogenesis | Year: 2016

Helicobacter pylori has been described as the main etiologic agent of gastric cancer, causing a considerable rate of mortality and morbidity in human population across the world. Although the infection mainly begins asymptomatically, but simply develops to peptic ulcer, chronic gastritis, lymphoma of the gastric mucosa and eventually adenocarcinoma. The major pathological feature of H. pylori infection is due to the activity of the cytotoxin-associated gene A (CagA), a 125-140 kDa protein encoded by the cag pathogenicity island (cagPAI). CagA is also known as the first bacterial onco-protein, ranking the H. pylori-mediated adenocarcinoma as the second most deadly cancer type worldwide. Upon cytoplasmic translocation CagA undergoes interacting with numerous proteins in phosphorylation dependant and independent manners within the gastric epithelial cells. The profound effect of CagA on multiple intracellular pathways causes major consequences such as perturbation of intracellular actin trafficking, stimulation of inflammatory responses and disruption of cellular tight junctions. Such activities of CagA further participate in development of the hummingbird phenotype and gastric cancer. This review is sought to provide a structural and functional analysis of the CagA protein with focus on demonstrating the molecular basis of the mechanism of CagA intracellular translocation and its interaction with intracellular targets. © 2016 Elsevier Ltd.

Popelysheva A.E.,Krasnoyarsk State Medical University
Diabetes Mellitus | Year: 2015

Aim. The haemodynamics of patients with diabetes mellitus 2 during acute ischaemic stroke and their connection with the recovery of neurological deficit has been inadequately studied. Materials and Methods. We studied the blood pressure dynamics of 183 patients with mild-to-moderate acute ischaemic stroke receiving antihypertensive therapy, depending on whether or not they had type 2 diabetes mellitus. Results. In patients with diabetes, high blood pressure persisted during the first week, mainly because of the diastolic index, and they had a more rapid decline in blood pressure in the second week than those without diabetes. However, reaching the target blood pressure of <160/100 mmHg was faster in patients with diabetes, regardless of the intensity of antihypertensive therapy. Although diabetes significantly correlated with the efficiency of recovery of neurological deficit, it also showed a tendency to frequent functional impairment in patients with diabetes than those without diabetes. Conclusions. The results suggest that patients with diabetes and hypertension require less aggressive treatment, particularly in the second week of hospitalization. This may affect the efficiency of recovery of functional deficits. Further study of blood pressure dynamics and their relation to functional recovery of neurological deficit is required during the acute period after an ischaemic stroke in patients with diabetes.

Labib M.,University of Ottawa | Zamay A.S.,University of Ottawa | Zamay A.S.,Krasnoyarsk State Medical University | Berezovski M.V.,University of Ottawa
Analyst | Year: 2013

A novel attempt was made to develop a disposable multifunctional sensor for analysis of vaccinia virus (VACV), a promising oncolytic agent that can replicate in and kill tumor cells. Briefly, we developed aptamers specific to VACV that were negatively selected against human serum as well as human and mouse blood to be further utilized for viral analysis directly in serum and blood. In addition, the aptamers were negatively selected against heat-inactivated VACV to enable them to distinguish between viable and nonviable virus particles. The selected aptamers were integrated onto an electrochemical aptasensor to perform multiple functions, including quantification of VACV, viability assessment of the virus, and estimation of the binding affinity between the virus and the developed aptamers. The aptasensor was fabricated by self-assembling a hybrid of a thiolated ssDNA primer and a VACV-specific aptamer onto a gold nanoparticles modified screen-printed carbon electrode (GNPs-SPCE). Square wave voltammetry was employed to quantify VACV in serum and blood within the range of 150-900 PFU, with a detection limit of 60 PFU in 30 μL. According to the electrochemical affinity measurements, three virus specific aptamer clones, V-2, V-5, and V-9 exhibited the highest affinity to VACV. Furthermore, flow cytometry was employed to estimate the dissociation constants of the clones which were found to be 26.3, 40.9, and 24.7 nM, respectively. Finally, the developed aptasensor was able to distinguish between the intact virus and the heat-inactivated virus thanks to the tailored selectivity of the aptamers that was achieved via negative selection. This journal is © The Royal Society of Chemistry.

Rogozina M.S.,Krasnoyarsk State Medical University
Journal of Siberian Federal University - Mathematics and Physics | Year: 2015

The correctness Cauchy problem is explored for a polynomial difference operator. The easily verifiable sufficient condition correctness for the Cauchy problem for a polynomial difference operator with constant coefficients is proved whose characteristic polynomial is homogeneous. © Siberian Federal University. All rights reserved.

Labib M.,University of Ottawa | Zamay A.S.,University of Ottawa | Zamay A.S.,Krasnoyarsk State Medical University | Muharemagic D.,University of Ottawa | And 4 more authors.
Analytical Chemistry | Year: 2012

The development of aptamer-based viability impedimetric sensor for viruses (AptaVISens-V) is presented. Highly specific DNA aptamers to intact vaccinia virus were selected using cell-SELEX technique and integrated into impedimetric sensors via self-assembly onto a gold microelectrode. Remarkably, this aptasensor is highly selective and can successfully detect viable vaccinia virus particles (down to 60 virions in a microliter) and distinguish them from nonviable viruses in a label-free electrochemical assay format. It also opens a new venue for the development of a variety of viability sensors for detection of many microorganisms and spores. © 2012 American Chemical Society.

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