[The problem of genomic instability of cultivated human stem cells].

The wide application of human stem cells in biomedical technologies leads to the necessity to analyze the genomic stability of cultivated stem cells of different origin. The review presents data on genetically stable and unstable continuous lines of human embryonic stem cells (hESC), their differentiated derivatives and adult stem cells. Causes of genomic instability occurrence are considered and analysis of the methods used to study the genome of cell lines has been carried out.

[Influence of human fetal mesenchymal stem cells on glioma cell proliferation. A consequence of cellular crosstalk].

The effect of mesenchymal stem cells (MSCs) on the growth of various tumors is ambiguous. MSCs derived from different tissues stimulate growth of some tumor types and exert antitumor effects on the other. Several recent reports have shown that crosstalk between tumor cells and MSCs contribute to these effects.

[Comparative characteristics of mesenchymal stem cell lines derived from bone marrow and muscle of limb of early human embryo].

In this work, we have carried out a comparative analysis of the characteristics of mesenchymal stem cell lines isolated from different tissues of 5-6-weeks homan embryo: bone marrow (line FetMSC) and muscle of limb (line M-FetMSC). The basic characteristics of these lines were obtained at the 6th passage. Average population doubling time was 33.

[Expression of TGFbeta family factors and FGF2 in mouse and human embryonic stem cells maintained in different culture systems].

Mouse and human embryonic stem cells are in different states of pluripotency (naive/ground and primed states). Mechanisms of signaling regulation in cells with ground and primed states of pluripotency are considerably different. In order to understand the contribution of endogenous and exogenous factors in the maintenance of a metastable state of the cells in different phases ofpluripotency, we examined the expression of TGFbeta family factors (ActivinA, Nodal, Leftyl, TGFbeta1, GDF3, BMP4) and FGF2 initiating the appropriate signaling pathways in mouse and human embryonic stem cells (mESCs, hESCs) and supporting feeder cells.