TY - JOUR
T1 - In vivo activity of the cleaved form of soluble urokinase receptor
T2 - A new hematopoietic stem/progenitor cell mobilizer
AU - Selleri, Carmine
AU - Montuori, Nunzia
AU - Ricci, Patrizia
AU - Visconte, Valeria
AU - Baiano, Antonio
AU - Carriero, Maria Vincenza
AU - Rotoli, Bruno
AU - Rossi, Guido
AU - Ragno, Pia
PY - 2006/11/15
Y1 - 2006/11/15
N2 - Cleaved forms of soluble urokinase receptor (c-suPAR) have been detected in body fluids from patients affected by various tumors. We recently reported increased c-suPAR levels in sera of healthy donors during granulocyte colony-stimulating factor (G-CSF)-induced mobilization of CD34+ hematopoietic stem cells (HSC). In vitro, c-suPAR or its derived chemotactic peptide (uPAR84-95) stimulated migration of human CD34+ HSCs and inactivated CXCR4, the chemokine receptor primarily responsible for HSC retention in bone marrow. These results suggested that c-suPAR could potentially contribute to regulate HSC trafficking from and to bone marrow. Therefore, we investigated uPAR84-95 effects on mobilization of mouse CD34+ hematopoietic stem/progenitor cells (HSC/HPC). We first showed that uPAR84-95 stimulated in vitro dose-dependent migration of mouse CD34+ M1 leukemia cells and inactivated murine CXCR4. uPAR 84-95 capability to induce mouse HSC/HPC release from bone marrow and migration into the circulation was then investigated in vivo. uPAR 84-95 i.p. administration induced rapid leukocytosis, which was associated with an increase in peripheral blood CD34+ HSCs/HPCs. In vitro colony assays confirmed that uPAR84-95 mobilized hematopoietic progenitors, showing an absolute increase in circulating colony-forming cells. uPAR84-95 mobilizing activity was comparable to that of G-CSF; however, neither synergistic nor additive effect was observed in combining the two molecules. These findings show for the first time in vivo biological effects of c-suPAR. Its capability to mobilize HSCs suggests potential clinical applications in HSC transplantation.
AB - Cleaved forms of soluble urokinase receptor (c-suPAR) have been detected in body fluids from patients affected by various tumors. We recently reported increased c-suPAR levels in sera of healthy donors during granulocyte colony-stimulating factor (G-CSF)-induced mobilization of CD34+ hematopoietic stem cells (HSC). In vitro, c-suPAR or its derived chemotactic peptide (uPAR84-95) stimulated migration of human CD34+ HSCs and inactivated CXCR4, the chemokine receptor primarily responsible for HSC retention in bone marrow. These results suggested that c-suPAR could potentially contribute to regulate HSC trafficking from and to bone marrow. Therefore, we investigated uPAR84-95 effects on mobilization of mouse CD34+ hematopoietic stem/progenitor cells (HSC/HPC). We first showed that uPAR84-95 stimulated in vitro dose-dependent migration of mouse CD34+ M1 leukemia cells and inactivated murine CXCR4. uPAR 84-95 capability to induce mouse HSC/HPC release from bone marrow and migration into the circulation was then investigated in vivo. uPAR 84-95 i.p. administration induced rapid leukocytosis, which was associated with an increase in peripheral blood CD34+ HSCs/HPCs. In vitro colony assays confirmed that uPAR84-95 mobilized hematopoietic progenitors, showing an absolute increase in circulating colony-forming cells. uPAR84-95 mobilizing activity was comparable to that of G-CSF; however, neither synergistic nor additive effect was observed in combining the two molecules. These findings show for the first time in vivo biological effects of c-suPAR. Its capability to mobilize HSCs suggests potential clinical applications in HSC transplantation.
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U2 - 10.1158/0008-5472.CAN-06-1311
DO - 10.1158/0008-5472.CAN-06-1311
M3 - Article
C2 - 17108125
AN - SCOPUS:33845313656
VL - 66
SP - 10885
EP - 10890
JO - Journal of Cancer Research
JF - Journal of Cancer Research
SN - 0008-5472
IS - 22
ER -