Vol 2, No 2 (2007)

Expression of SMAD interacting protein 1 (Sip1) during mouse CNS development was studied by in situ hybridization and immunohistochemistry. Starting at E12.5, Sip1 transcripts are present in a regionalized fashion and persist throughout development. Sip1 is expressed in the cortical plate, ventricular zone of the basal ganglia, thalamus, pons and midbrain, specific nuclei of the brain stem and in the dorsal part of the spinal cord. In the developing cerebral cortex, Sip1 expression shows regional specificity. In the brain of the adult mice, SIP1 expression is detected mostly in the hippocampus, dentate gyrus and white matter of the neocortex.

We investigated the expression of the Sip1 gene in the brains of newborn reeler mutants. At this stage in the wild type piriform cortex Sip1 expression is found in the most outer part. In the piriform cortex of reeler mutants Sip1 expressing cells were not located in the superficial part but diffused.

Using a Cre/loxP-based approach, we studied the effect of conditional inactivation of Sip1 gene. The results provide new evidence for the important role of Sip1 in hippocampal neurogenesis.

The contribution aims to compare influence of intramyocardial autotransplantation of bone marrow multipotent mesenchymal stromal cells and bone marrow nucleated cells on a myocardium morphofunctional state after infarction. Chinchilla rabbits were exposed in the experiment. Myocardial infarction was modeled by ligating the anterior descending branch of the left coronary artery. The condition was evaluated with functional (electrocardiography, echocardiography) and morphologic methods. There were three groups of animals. To the first group animals (control, n = 13) α-МЕМ growth medium was injected into the damaged area; a culture of bone marrow multipotent mesenchymal stromal cells (2х10⁶) was introduced to the 2^nd group animals (n = 14), while the animals of the 3^rd group (n = 14) being given bone marrow nucleated cells (2х10⁶). It has been shown that intramyocardial autotransplantation of bone marrow multipotent mesenchymal stromal cells in experimental myocardial infarction resulted in ischemic area restriction, normalization of systolic function indices as well as stimulation of angiogenesis. Аt the same time intramyocardial autotransplantation of bone marrow nucleated cells was followed by an expansion of ischemic area and reduction of systolic function indices as compared with the controls, although angiogenesis activation occurred.

The article presents the results of a study of resorbed polyhydroxialkanoats (linear polyesters of microbiologic origin) aptitude for different cellular matrix development. ln the experiment samples of high-purity polyhydroxialkanoats produced by Ralstonia eutropha B 5786 bacteria were used. A technology to produce polyhydroxialkanoats of various chemical structures is developed in the Institute of Biophysics of the Siberian branch of the Russian Academy of Sciences. Using polyhydroxialkanoats in different phase states (solutions, emulsions, powder) a structure and properties of two- and tree-dimentional matrix such as flexible transparent slick, membrane, fine fibres, microparticles, sponge, volumetric solid and porous structures are produced and studied. The matrix can be sterilized with standard methods without changing its structure, stability loss or adhesion quality deterioration as well as its fitness for growing cells in vitro. Matrix biocompatibility was assessed in cultures of fibroblasts, hepatocytes, endothelial cells and osteoblasts in vitro. Microscopy, inter vivos/alive staining with tripan blue, detection of protein and ONA synthesis by cells being cultured, as well as MMT have not shown polyhydroxialkanoat matrix to be cytotoxic in a direct contact with any type of cells used. The data obtained allow to recommend polyhydroxialkanoats - new type of thermpstable, biocompatible and resorbed polyester - for development of different constructions for cellular therapy and tissue engineering.