[Effect of radiation and radioprotectors on the properties of hematopoietic stem cells].

Sublethal irradiation of donors leads to a change in some properties of bone marrow haemopoietic stem cells (HSC) during the exponential growth (days 1-8) of the syngeneic recipients in the spleen. They are: an increase in the rate of proliferation, a slight reduction in time of the population doubling, and a tendency toward an increase in the percentage of cells settled in the spleen after transplantation. These changes in the properties of HSC provide a more rapid repopulation thereof as compared to HSC of intact mice.

[Characteristics of lymphocytoid cells detected during post-radiation bone marrow recovery].

As a result of complex study of lymphocyte-like cells which arise in the regenerating bone marrow of sublethally irradiated mice, it was established that: (1) X-cells precipitate in the 2nd and, partially, 3rd fractions of the albumin gradient, i. e. in the same fractions as the stem cells of intact animals; (2) X-cells do not belong to polypotent hemopoietic stem cells; (3) X-cells belong to B-lymphocytes, i.