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TRANSLATIONAL AND CLINICAL RESEARCH

Granulocyte Colony-Stimulating Factor Mobilizes More Dendritic Cell Subsets Than Granulocyte-Macrophage Colony-Stimulating Factor with No Polarization of Dendritic Cell Subsets in Normal Donors

^aTexas Transplant Institute, San Antonio, Texas, USA;
^bUniversity of Texas Health Science Center at San Antonio, San Antonio, Texas, USA

Key Words. Granulocyte colony-stimulating factor • Granulocyte-macrophage colony-stimulating factor • Graft versus host disease • Dentritic cells • Mobilization

Correspondence: Paul J. Shaughnessy, M.D., 8201 Ewing Halsell, Suite 280, San Antonio, Texas 78229, USA. Telephone: 210-575-8500; Fax: 210-575-8506; email: Paul.Shaughnessy{at}MHShealth.com

Received October 8, 2005; accepted for publication March 13, 2006.

Dendritic cells (DCs) are effective antigen-presenting cells. We hypothesized that increasing the DC populations in donor lymphocyte infusions (DLIs) may augment the graft versus malignancy effect, particularly if granulocyte-macrophage colony-stimulating factor (GM-CSF) mobilization resulted in increased precursor dendritic cell (pDC) 1 cells. Mature DCs, pDC1 cells, pDC2 cells, and CD34⁺ cells from the same donor were compared after granulocyte colony-stimulating factor (G-CSF) mobilized peripheral blood stem cell collections and GM-CSF mobilized DLI collections. Mobilization with G-CSF resulted in up to a 10-fold larger number of CD34⁺ cells per kg and a 3–5-fold larger number of mature DCs, pDC1 cells, and pDC2 cells within the same donor compared with GM-CSF. The ratio of pDC1 to pDC2 in each donor remained constant with either cytokine. In this small sample of normal donors, it appears that G-CSF mobilizes more CD34⁺ cells, mature DCs, pDC1 cells, and pDC2 cells within the same donor than does GM-CSF, with no significant polarization by G-CSF or GM-CSF for either pDC1 or pDC2 cells.