Abstract. C57Bl/6 mice were exposed to γ-radiation in a sublethal dose of 7.5 Gy. In 3 hours injection 10 6 /mouse of bone marrow multipotent mesenchymal stromal cells stem cells intravenously to experimental group was done. Methods used: body weight measurement, open field behavior, subfraction composition of blood serum (laser correlation spectroscopy, LCS), histological examination of the spleen, liver, and pancreas, count of T and B cells, white blood formula. After 1.5 and 3 months the general trend towards intermediate position of the parameters observed in the experimental between those in intact and irradiated controls attests to partial protective/restorative effects of the injected cells.

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Microgravity simulation in rats resulted to changes in eye lavage content. Molecular subfraction analysis with laser correlation spectroscopy revealed significant differences in the pattern of particle distribution in five intervals: 1.9 -2.56 nm, 4.64-6.25 nm, 91.3 nm, 165-300 nm, and 400-734 nm. Microgravity modeling induced a series of interrelated processes in the retina of experimental rats manifesting in decreasing of total and layer-by-layer thickness of the retina, mild edema, and consequently, the increasing of specific density of neurons. In the inner nuclear layer, the cell density decreased because of the amacrine and bipolar cells. These changes could be explained by relative ischemia of the retinal layers, which are dependent on the retinal vessels circulation system.