Abstract
Peripheral blood stem cells (PBSCs), usually mobilized with granulocyte colony-stimulating factor (G-CSF) alone or in combination with chemotherapy, are the preferred source of cells for hemopoietic stem cell transplantation. Up to 25% of otherwise eligible transplant recipients fail to harvest adequate PBSCs. Therefore it is important to investigate existing and novel reagents to improve PBSC mobilization. Because of marked interindividual variation in humans, we developed a robust nonhuman primate model that allows the direct comparison of the efficacy of two PBSC mobilization regimens within the same animal. Using this model, we compared pegylated G-CSF (pegG-CSF) with standard G-CSF and compared the combination of G-CSF and pegylated megakaryocyte growth and development factor (pegMGDF) with G-CSF plus stem cell factor (SCF) by measuring the levels of CD34(+) cells, colony-forming cells (CFCs), and SCID repopulating cells (SRCs) before and after cytokine administration. Mobilization of CD34(+) cells, CFCs and SRCs using pegG-CSF achieved similar levels to those resulting from 5 days of standard G-CSF. The combination of G-CSF+pegMGDF mobilized progenitors to levels similar to G-CSF+SCF but greater than standard G-CSF for CD...Continue Reading
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