Toxicity of Nanocomplexes Containing Gadolinium Orthovanadate Nanoparticles and Cholesterol.

Previous studies have shown the ability of nanocomplexes (NCs), which consist of nanoparticles (NPs) of orthovanadates of rare earth metals (GdYVO:Eu) and cholesterol, to inhibit the growth of Ehrlich's ascites carcinoma (EAC). However, the biosafety of these NCs remains unclear. Our objective was to investigate the acute and subchronic toxicity of NCs.

Experimental therapy of graft-versus-host disease by mesenchymal stromal cells grown on oxide nanocoatings.

Immune aggression to transplanted allogeneic bone marrow, i.e. the graft-versus-host disease (GVHD), could be decreased by the suppression of effector and/or activation of T- regulatory cells (Treg).

The use of nanocomposite coatings with various physicochemical properties in tissue engineering.

We studied the effect of nanocomposite coatings with various physicochemical properties on the structural and functional properties (adhesion potential, phenotype, gene expression) of mesenchymal stem cells. Of all tested nanocoatings (Al2O3, ZrO2, Ta2O5), oxide coating Al2O3 enriched in vitro monolayer bone marrow cell culture with cells carrying mesenchymal stem cells phenotype markers and stimulated expression of ido gene, which can confer new therapeutic potencies to these cells and extend their application in clinical practice.

[Comparative study of the proliferative activity of native and cryopreserved colony-forming units in humans and mice].

The agar culture method was used to state that colony-forming units responsible for cell structures of a hemopoietic series remained undamaged after cryopreservation (-196 degrees) in a suspension of mouse and human donor bone marrow. Cultivation of cryopreserved bone marrow revealed the inhibition of proliferative activity of cells growing in agar as compared with native ones. The inhibition of DNA synthesis was the basis of this process.

[Effect of low-temperature preservation on the proliferative activity and topography of the dissemination of donor and cadaveric colony-forming units (CFU) in an irradiated organism].

Investigation carried out by means of chromosome marker T6T6 showed that frozen donor and cadaver bone marrow cells (6 h and 12 h after death) survive and proliferate in the organism of lethally irradiated recipient; the proliferation and differentiation intensity of cadaver cells is reduced in comparison with the donor cells.

[Cellular structures formed during bone marrow cultivation in agar].

The growth-enhancing effect and the differentiation of colonies formed by native and frozen-thawed myelokaryocytes in semiliquid agar were observed over a period from the 2nd to the 28th day. The cultivation of bone marrow in agar was shown to form colonies consisting of haemopoietic cells as well as of stromal elements. Under the cultivation of frozen-thawed bone marrow, the retardation of proliferative activity of growing cells was observed within up to 4 days.

[Macrophage reaction in the bed of an allogeneic skin transplant].

The character of cell reactions, number of macrophages at the place of skin allograft was demonstrated to depend on the stage of posttransplantational period. Macrophagal reaction increases as the crisis of rejection is approaching; functional and metabolic activity of macrophages is increasing that is evident from an intensive vacuolization of cytoplasm, decreased contents of glycogene, enhanced acid phosphatase activity in them, increased amount of H3-thymidin labelled cells.