[The characteristics of the development of the immune function in the transplanted spleen of newborn mouse pups in recipients of different ages. I. The effect of the cells in the stromal microenvironment of the transplant].

The age-related changes in the cell composition, immune response to SRBC and proliferative activity of T- and B-cells in vitro were determined in neonatal spleen grafted to CBA/Ca female mice of different ages. The dependence of the immune response upon the recipient's age was observed. This result indicate that "young" transplant stromal cells are incapable of immune response increase in the old recipients. Analysis of the T- and B-cells content in the spleen grafted to the recipients of different ages demonstrated no differences. The decrease of the T-cell proliferative activity and existence of the inverse correlative connection between content of the T-cells and PFCs in spleen grafted to the old recipients were demonstrated. Additional neonatal thymus transplantation is proposed as tools for correction of the age-related changes in the immune function.