Simultaneous Injection of Bone Marrow Cells and Stromal Cells into Bone Marrow Accelerates Hematopoiesis In Vivo

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Abstract
We have previously demonstrated that stromal cells can support the proliferation and differentiation of hematopoietic cells in vitro and in vivo and that a major histocompatibility complex restriction exists between hematopoietic stem cells and stromal cells. We have also found that intra–bone marrow (IBM) injection of allogeneic bone marrow cells (BMCs) leads to more rapid reconstitution of hematopoietic cells than intravenous injection. In the present study, we examine the effect of simultaneous injection of stromal cells and BMCs into the same bone marrow on the recovery of donor hematopoietic cells and demonstrate that simultaneous IBM injection of BMCs plus stromal cells is more effective in reconstituting recipients with donor hematopoietic cells than intravenous injection of BMCs plus stromal cells or IBM injection of BMCs alone.

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