The influence of human fetal bone (FB) on the hemopoietic and stromal cells were studied in the morphometric assay of the bone marrow trephine biopsy samples after a preliminary cultivation using the Marbrook system for 1-5 weeks. The rat FB effect on the hemopoiesis and survival were also studied in experiment with FB transplantation to rats with prior administration of lethal and sublethal doses of cyclophosphamide. In long-term cultivation of the bone marrow trephine biopsy samples, enhanced proliferation of the fibrous tissue and elimination of hemopoietic elements were seen. Combined cultivation of the trephine biopsy samples of the bone marrow and FB inhibited the fibrous tissue proliferation and enhanced the viability of the hemopoietic and lipid cells. Transplantation of the FB in experiment shortened the leukocytopenia period in rats after sublethal (300 mg/kg) and lethal (500 mg/kg) doses of cyclophosphamide and increased their survival.
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