Efficiency of photodynamic inactivation Actinomyces israelii and Prevotella melaninogenica.

Background: The goal of our work was to develop a composition for antimicrobial photodynamic inactivation (aPDI) of anaerobic periodontopathogenic pathogens.

Methods: The three test groups were as follows: light plus doxycycline (L+DOX+), light plus doxycycline and hypericin (L + DOX + HYP +), and control groups. aPDI was evaluated by the number of grown colonies on a dense nutrient medium after 12, 24, and 48 hours of bacterial suspension cultivation.

The Influence of Adiponectin on Transport of Low-Density Lipoproteins through Human Endothelial Cell Monolayer In Vitro.

The influence of adiponectin, a protein secreted by adipocytes, on the activation of transendothelial LDL transport, the initial event of atherogenesis, was studied. The addition of adiponectin to the cultured endothelial hybridoma EA.hy926 cells did not affect both basal and TNF-stimulated transendothelial transport of LDL.

Effect of Functionalization of the Polycaprolactone Film Surface on the Mechanical and Biological Properties of the Film Itself.

The lack of suitable functional groups for cell adhesion on the surface of Polycaprolactone (PCL) is one of the main limitations in order to use PCL for biomedical applications. The aim of this research is to modify the PCL film surface using arginine, via an aminolysis reaction. In this regard, after PCL films formation by casting method, they were immersed in arginine solutions of various concentration at room temperature or then heated to 40 °C and in the presence of isopropanol or without it.

MORPHOLOGICAL EFFICACY EVALUATION OF GEL WITH CARBON DIOXIDE EXTRACT OF HOPS IN CASE OF COMPLICATED WOUND INFECTION ACNE VULGARIS.

Objective: The aim of the study is to reveal in the experiment the morphological features of the infected skin wounds healing, which are a manifestation of acne vulgaris severe and very severe forms, using a gel with carbon dioxide extract of hops.

Patients And Methods: Materials and methods: An experimental study was carried out on 80 male WAG rats of three months of age. The animals were divided into 9 groups.

Protecting the skin-implant interface with transcutaneous silver-coated skin-and-bone-integrated pylon in pig and rabbit dorsum models.

Implant-associated soft tissue infections at the skin-implant interface represent the most frequent complications in reconstructive surgery and lead to implant failures and revisions. Titanium implants with deep porosity, called skin-and-bone-integrated-pylons (SBIP), allow for skin ingrowth in the morphologically natural direction, thus restoring a reliable dermal barrier and reducing the risk of infection. Silver coating of the SBIP implant surface using physical vapor deposition technique offers the possibility of preventing biofilm formation and exerting a direct antimicrobial effect during the wound healing phase.

[Expression of osteoprotegerin and soluble ligand of receptor of kappa-B transcription factor activator in the calcification of aortic valve].

The mechanism of valve calcification that is the main cause of aortic stenosis formation and progression is not yet clear. In recent years, the role of the OPG/RANKL/RANK system is considered as one of possible variants of pathogenesis of valve calcification. In presented work the differences in OPG and sRANKL levels involved in the calcification processes in tissues of patients with severe aortic stenosis have been examined.

Evaluation of the temporary effect of physical vapor deposition silver coating on resistance to infection in transdermal skin and bone integrated pylon with deep porosity.

Periprosthetic infection via skin-implant interface is a leading cause of failures and revisions in direct skeletal attachment of limb prostheses. Implants with deep porosity fabricated with skin and bone integrated pylons (SBIP) technology allow for skin ingrowth through the implant's structure creating natural barrier against infection. However, until the skin cells remodel in all pores of the implant, additional care is required to prevent from entering bacteria to the still nonoccupied pores.

Aortic Graft at Coronary Artery Bypass Surgery as a Source of Human Aortic Smooth Muscle Cells.

One of the serious obstacles of the aortopathies research is a considerable shortage of human aortic smooth muscle cells (SMCs), which can be used to model the disease. SMC in most cases come from the whole aorta of transplant donors, which are rather difficult to access. In the course of coronary artery bypass graft (CABG) surgery, a fragment of aortic tissue is excised to make a bypass root.

Effect of Concentration of Collagen Gel on Functional Activity of Bone Marrow Mesenchymal Stromal Cells.

Collagen I gels with protein concentrations of 1, 2, and 3.5 mg/ml were prepared and embedded in a porous polylactide scaffold to reduce their contraction. Concentration of the gel did not affect its degradation.

Knock-down of Hdj2/DNAJA1 co-chaperone results in an unexpected burst of tumorigenicity of C6 glioblastoma cells.

The chaperone system based on Hsp70 and proteins of the DnaJ family is known to protect tumor cells from a variety of cytotoxic factors, including anti-tumor therapy. To analyze whether this also functions in a highly malignant brain tumor, we knocked down the expression of Hsp70 (HSPA1A) and its two most abundant co-chaperones, Hdj1 (DNAJB1) and Hdj2 (DNAJA1) in a C6 rat glioblastoma cell line. As expected, tumor depletion of Hsp70 caused a substantial reduction in its growth rate and increased the survival of tumor-bearing animals, whereas the reduction of Hdj1 expression had no effect.

Phenotypic and Functional Changes of Endothelial and Smooth Muscle Cells in Thoracic Aortic Aneurysms.

Thoracic aortic aneurysm develops as a result of complex series of events that alter the cellular structure and the composition of the extracellular matrix of the aortic wall. The purpose of the present work was to study the cellular functions of endothelial and smooth muscle cells from the patients with aneurysms of the thoracic aorta. We studied endothelial and smooth muscle cells from aneurysms in patients with bicuspid aortic valve and with tricuspid aortic valve.

STABILITY OF THE GELS BASED ON TYPE I COLLAGEN AND HYALURONIC ACID.

Development of hyaluronic acid (HA) supplemented biomaterials for regenerative medicine is complicated with easy water solubility of HA. It results in decreased stability of HA-based scaffolds that, consequently, initiated search for crosslinking techniques intended to retain HA within a scaffold. In this study, gels composed of type I collagen and native high molecular weight HA were prepared and their stability in buffer solutions has been evaluated.

Matrix Metalloproteinases in Primary Culture of Cardiomyocytes.

The highly organized contractile apparatus of cardiomyocytes in heart tissue allows for their continuous contractility, whereas extracellular matrix components are synthesized and spatially organized by fibroblasts and endothelial cells. However, reorganization of the cardiomyocyte contractile apparatus occurs upon their 2D cultivation, which is accompanied by transient loss of their contractility and acquired capability of extracellular matrix synthesis (Bildyug, N. B.

Glu-Trp-ONa or its acylated analogue (R-Glu-Trp-ONa) administration enhances the wound healing in the model of chronic skin wounds in rabbits.

The management of chronic skin wounds represents a major therapeutic challenge. The synthesized dipeptide (Glu-Trp-ONa) and its acylated analogue (R-Glu-Trp-ONa) were assessed in the model of nonhealing dermal wounds in rabbits in relation to their healing properties in wound closure. Following wound modeling, the rabbits received a course of intraperitoneal injections of Glu-Trp-ONa or R-Glu-Trp-ONa.

[Activity of matrix metalloproteinases of transformed fibroblasts under the antioxidant action].

We have shown that antioxidant N-acetylcysteine (NAC, 2-10 mM) quickly (for 2 hours) and completely inactivates the activity of matrix metalloproteinases (gelatinases MMP-2 and MMP-9, and collagenases MMP-1 and MMP-8) secreted by transformed mouse fibroblasts 3T3-SV40 into the medium. The same MMP inhibition took place in the cell-free conditioned medium of HT-1080 fibroblasts, which suggests a direct chemical interaction between NAC and MMP resulting in the loss of MMP activity. Besides inhibitory effect, NAC decreased MMP-1 and MMP-9 (but not MMP-2) production in the cell medium.

[Functional properties of smooth muscle cells in ascending aortic aneurysm].

Thoracic aortic aneurism (TAA) develops as a result of complex series of events that dynamically alter the structure and composition of the aortic vascular extracellular matrix (ECM). The main elements that alter the composition of aortic wall are smooth muscle cells (SMC). The purpose of the present work was to study alteration of smooth muscle cell functions derived from the patients with TAA and from healthy donors.

[Migration rate of rabbit bone marrow stromal cells and rabbit dermal fibroblasts in different gels and activity of their MMPs].

This paper presents the results of the study of rabbit bone marrow stromal cells (BMSC) and rabbit dermal fibroblasts (DF) migration rates to collagen type I and fibrin gels. It has been shown that DF exhibit greater migration activity in collagen gel, whereas BMSC show a higher migration activity in fibrin gels. By studying the activity of matrix metalloproteinases (MMPs) synthesized by cells during cultivation in gels, it has been found for both cell types that the activity of MMP-9 is increased in fibrin gels and activity of MMP-2 is increased in collagen gels.

[Developing of a new feeder-free system and characterization of human embryonic stem cell sublines derived in this system under autogenic and allogenic culturing].

A new feeder-free culture system for human embryonic stem cells (hESC) was developed. It consist of extracellular matrix proteins synthesized by feeder cells--mesenchymal stem cell line SC5-MSC, which was derived from initial hESC line SC5. The major ECM proteins--fibronectin and laminin--that maintain hESC growth in feeder-free system were identified.

[Dynamics of matrix metalloproteinases activity of primary murine embryonic fibroblasts during cultivation].

Embryonic cells regulate the expression of matrix metalloproteinases (MMP) providing remodulation of extracellular matrix, which in turn provides the changes in cell adhesion and migration during the cell development and differentiation. In present work we studied the changes of gelatinases (MMP-2 and MMP-9) and collagenases (MMP-1 and MMP-8) activities in the process of cultivating the primary murine embryonic fibroblasts (MEF). Cultivation was continued for 6 passages, after that the culture died in time.

Functional properties of proteins from the coelomic fluid of the wounded sea star Asterias rubens (L).

Impact on viability and adhesion of three protein fractions, separated by size, from the coelomic fluid of wounded Asterias rubens', was tested on autologous coelomocytes. In addition antimicrobial property of the protein fractions was tested on the Gram-negative bacterium Vibrio parahaemolyticus. All fractions promoted viability and the larger proteins facilitated adhesion of the coelomocytes.

[Possibility of prediction of rat wound epithelization by changes of matrix metalloproteinases levels in wound fluid].

The engraftment of a skin sheet together with transplantation of dermal equivalent was studied on rats. The skin sheet was taken as a source of epithelization material in unhealing wound. The process of wound healing was evaluated by changes of matrix metalloproteinases (MMP) activity levels in wound fluid.

[The dependence of MMP-2 and MMP-9 activity in wound fluid on the wound tissue state at initial stages of wound healing process].

One of the problems in wound treatment optimization is the necessity of an effective and objective method of laboratory wound process monitoring. In present study the current wound process was estimated by changes in MMP-2 and MMP-9 activities in the wound fluid. An original model was used in this work to study correlation of morphological structure of the wound with the activities of MMP-2 and MMP-9 in wound fluid at various types of wound process.

[Changes in matrix metalloproteinases activities in normal and transformed mouse fibroblasts under effect of antioxidants].

The effect of two antioxidants on the activities of matrix metalloproteinases (MMP) secreted by normal (3T3) and transformed (3T3-SV40) mouse fibroblasts was examined. We compared the effect of N-acetylcystein (NAC) and alpha-lipoic acid (ALA) on two gelatinases, MMP-2 and MMP-9. Gel zymography demonstrated that activity of MMP-2 was higher in normal 3T3 cells, and MMP-9 activity was higher in transformed 3T3-SV40 cells.

Prognostication criterion of potential and practical use of analytical reagents in titrimetria of individual substances.

Various possible criterion in titrimetric methods have been discussed in this paper and more informative, visual and universal criterion-the degree of proceeding of individual reaction at the equivalence point have been chosen. The equation for the degree of proceeding of individual analytical reaction suited for any chemical reactions under real conditions with an allowance made for both component and titrant concentration have been deduced. This criterion allows us to make a prognosis of any parametres of a titrimetric procedure of an individual substance determination and the procedure as a whole, not having carried out the experiment.

[Isolation of human basal keratinocytes by selective adhesion to extracellular matrix proteins].

Epidermal human cells (keratinocytes) differently interact with extracellular matrix proteins of the skin basal membrane depending on the stages of their differentiation. The pool of basal keratinocytes commonly includes stem cells and transient amplifying cells. They directly attach to the skin basal membrane.