[Live attenuated and inactivated influenza vaccines: data from direct comparative studies].

Comparative evaluation of live attenuated and inactivated influenza vaccines based on data from direct comparative studies is necessary for ensuring the most effective and safe vaccination against influenza. Analysis of direct comparative preclinical and clinical studies of inactivated and live cold-adapted (ca) influenza vaccines showed that published data are inconsistent and limited for some population groups. Live ca vaccines may be promising as an alternative or addition to inactivated vaccines especially for mass vaccination against influenza in children as well as in the elderly when combined with inactivated vaccines.

[Cells of endothelial lineage (or endothelial-like cells) as possible progenitor cells of sarcomas induced by implanted foreign body].

This study is dedicated to the problem of the origin of progenitor cells of sarcomas induced by implantation of a foreign body (polyvinilchloride plates) to mice. It is known that such cells are found among the cells of the monolayer covering the surface of implanted plate without any signs of tumor growth in 6 and more months after implantation. We studied the existence of endothelial features of mesenchymal type cells that had been grown by culturing the cells from the implanted plate surface in 9 and 14 months after implantation.

[Epidemiologic and economic effectiveness of school closure during influenza epidemics and pandemics].

Epidemiologic and economic effectiveness of school closure during influenza epidemics and pandemics is discussed. Optimal effect of school closure is observed when this measure is taken at the start of the epidemic or pandemic and for a sufficiently long time. School closure during high morbidity among schoolchildren, in the middle (at the peak) and by the end of epidemic or pandemic does not influence significantly the spread of influenza or morbidity.

[Increasing the immunogenicity of inactivated chitosan adjuvanted vaccine from A/California/7/09 (H1N1) strain and analyzing the antigenic specificity of this influenza virus strain].

Addition of chitosan as an adjuvant to subunit vaccine from the swine origin influenza virus A/California/7/09 (H1N1) increases vaccine immunogenicity by 8-16 times and significantly enhances its protective potency. Single immunization with chitosan adjuvanted vaccine induced similar antibody titers as two immunizations with unadjuvanted vaccine. Chitosan stabilized the immunogenicity of subunit vaccine when stored at 4 degrees C.

[Enhancing the immunogenicity of inactivated polio vaccines with chitosan used as an adjuvant].

Addition of chitosan to inactivated trivalent polio vaccine or inactivated preparations of attenuated poliomyelitis viruses (Sabin strains) significantly increases immunogenicity of these inactivated poliomyelitis virus preparations. High neutralizing antibody titers are detected after two immunizations of mice and a single immunization of rats, as well as when the antigen dose was reduced by 4 times. Addition of chitosan as an adjuvant significantly induces cellular immunity.

[Influenza vaccines adjuvants--contemporary state].

Data on development and study of adjuvants for influenza vaccines against avian and seasonal influenza are presented. Requirements to perspective adjuvants, their main groups (mineral salts of aluminium, squalene derivatives, polyglycosides, and immunomodulators) as well as experimental adjuvants are reviewed. Analysis of results of several clinical trials of adjuvanted vaccines against avian influenza is presented.

[Comparative study of avian influenza virus propagation in the cell culture and chick embryos].

Comparative reproduction studies of 7 avian influenza virus strains (H5N1, H5N2, H3N2, H4N6, H7N7) in Vero and MDCK cell lines have indicated that the MDCK cell line is an optimal substrate for all study strains. The maximum viral output depends on trypsin concentrations and infection doses, which can differ for individual viral strains. The use of the optimal parameters of avian influenza virus replication in the MDCK cell lines yields virus titers comparable with virus reproduction in the chick embryos.

[Mechanisms of social behavior of the vertebrate tissue cells: cultural models].

Morphogenetic interactions between cells in the organism are largely reproduced in the cell cultures of various types, in particular, in that of the epitheliocytes and fibroblasts. The cultured cells interact by means of receptors and ligands, which activate intracellular signal systems. Three microenvironment components (liquid medium, extracellular matrix, and intercellular contacts) play the role of such ligands.

[Chitosan as an adjuvant for inactivated vaccines against avian influenza viruses].

Aim: To study chitozan as an adjuvant for inactivated vaccines against A/H5 influenza viruses.

Materials And Methods: Avian A/H5 influenza viruses were grown on chicken embryos or on MDCK cell line; viruses-containing fluid was inactivated with formalin. Mice were vaccinated intramuscularly with inactivated avian influenza virus mixed with chitozan and then levels of hemagglutination-inhibiting and neutralizing antibodies as well as protective efficacy against both homologous and drifted strains of avian influenza viruses A/H5 were measured.

[Avian influenza vaccines].

The review gives data on the designing of avian influenza vaccines and the preparation of human safe vaccine strains from the highly virulent strains of these viruses. It considers activated and live vaccines, promising adjuvants for vaccines, as well as recombinant, virus-vector, and DNA vaccines and virus-like particles. The results of a number of clinical trials of avian influenza vaccines are examined.

[Distribution of actin isoforms in normal, dysplastic, and tumorous human breast cells].

The distribution of beta- and gamma-cytoplasmic actins was compared in the normal cells and dysplastic malignant breast epithelial cells. In the normal luminal epithelium, beta- and gamma-cytoplasmic actins were located in different cell compartments: gamma-actin was more expressed in the apical parts of epithelial cells while beta-actin was in their basolateral domain. Polarized distribution of actinic isoforms was partially preserved in the papillomas and fibroadenomas; a more pronounced coexpression of isoforms was detected in the dysplastic proliferates.

[Mechanisms of the invasion of normal and malignant cells].

Different examples of invasion in normal ontogenesis and during the growth of malignant genetically altered cells are discussed. The invasive migration of single epithelial cells or cell groups may be regarded as pathological variants depending on complete or partial epithelio-mesenchymal transformation. A very special new type of epithelial cell dissemination from the monolayer was observed in our experiments with epithelial cells hyperexpressing transfected RhoA gene.

[Reorganization of cytoskeleton as basis for morphogenesis].

A brief review of the cytoskeleton dynamic structure in cells of two types: fibroblasts and epitheliocytes. Differences have been described between the functions of y-actin filaments and beta-actomyosin bundles. Tubulogenesis and angiogenesis have been considered as consequences of partial epitheliomesenchymal transformation and neoplastic transformation as a consequence of gamma-actomyosin bundles disturbance.

[Expression of E-cadherine as a differential diagnostic fest for lobular infiltrative breast cancers].

An immunomorphological study of 30 breast carcinomas was conducted. In accordance with the histological characteristics they had been previously diagnosed as lobular infiltrative carcinomas (LIC). We have studied E-cadherin cell-cell adhesion molecules and also epithelial markers and basement membranes.

[Expression of cell adhesion molecules E-cadherin and beta-catenin in infiltrating breast carcinoma].

Distribution of cell-cell adhesion molecules of E-cadherin (EC) and beta-catenin (BC) infiltrating breast carcinoma (BC) and markers of epithelium, basal membrane has been studied by immunofluorescence in 50 infiltrating BC tissue samples including 17 ductal carcinomas, 23 lobular carcinomas and 10 combined carcinomas. Two types of EC-BC structure alterations were found: homogeneity disorder accompanied by appearance of local thickening and gaps or complete lack of these structures. Alterations of type 1 were found in all the analyzed samples of ductal and combined carcinomas and partially in lobular carcinomas, in in situ structures and in invasion components as well.

[Cytoskeletal mechanisms of heterocellular contact formation].

We studied the interaction of two main cell types, epitheliocytes and fibroblasts, in a mixed culture. Heterotypic cells had a different cytoskeleton organization and expressed different cell adhesion molecules, cadherins. In spite of this, when the cells contacted in the mixed cultures, a heterophilic contact was formed and the actin cytoskeleton of an epitheliocyte at the site of contact was reorganized: the marginal actin bundle was decomposed and actin structures were formed in its place, that were typical for the fibroblast lamella.

[Mode of epithelium-fibroblast interaction in mixed heterotypic cell cultures].

The interaction between epithelium (dog kidney epithelium MDCJ/clone 20) and fibroblasts (diploid human fibroblasts M19 and AG-1523) was studied in mixed heterotypic cell cultures. The mode of cell interaction depends on the manner of their collision. At collision of the epithelium lamella and the lateral side of fibroblast, the lamella was seen to creep under the lateral side to force back the fibroblast.

[Effect of actomyosin contractility on focal contacts of myofibroblasts and structure of stress fibers].

Myofibroblasts from rat lung were cultivated. These cells in addition to beta- and gamma-cytoplasmic actins, expressed alpha-smooth muscle actin (alpha-SMA) and formed a system of "supermature" focal contacts, which were connected with thick stress-fibers expressing alpha-SMA and myosin II. Reduction of actin-myison contractility by inhibitors BDM and ML-7 lead to stress fiber reorganization, e.

[Neoplastic morphologic transformations and their normal analogs].

The mechanisms of possible cytoskeletal reorganizations leading to morphological transformations of cells of two types, epitheliocytes and fibroblasts, are discussed. It is suggested that the non-transformed cells of these types can exist in two morphological forms, sedentary and migratory, and that genetic changes occurring with carcinogenesis block the ability of cells to undergo transitions from the sedentary form to the migratory one.

[Change in fibroblast polarization during change in contractility of the actin cytoskeleton].

The aim of this work was to study role of the contractility in the process of fibroblast spreading. We investigated the morphology and cytoskeleton of cells seeded in the medium containing 2,3 butanedione monoxime (BDM), an inhibitor of myosin II and myosin-ATPase. Time-lapse video observation and immunofluorescence microscopy were used.