Abstract
G-CSF is the most often used agent in clinical hematopoietic stem and progenitor cell (HSPC) mobilization. However, in about 10 % of patients, G-CSF does not efficiently mobilize HSPC in clinically sufficient amounts. Cdc42 activity is involved in HSPC mobilization. In the present study, we explore the impact of Cdc42 inhibitor ML141 on G-CSF-mediated HSPC mobilization in mice. We found that the use of ML141 alone only triggered modest HSPC mobilization effect in mice. However, combination of G-CSF and ML141 significantly promoted HPSC counts and colony forming units in peripheral blood, as compared to mice treated with G-CSF alone. ML141 did not significantly alter the levels of SDF-1 and MMP-9 in the bone marrow, when used alone or in combination with G-CSF. We also found that G-CSF administration significantly increases the level of GTP-bound Cdc42, but does not alter the expression of Cdc42 in the bone marrow. Our data indicate that the Cdc42 signal is a negative regulator in G-CSF-mediated HSPC mobilization, and that inhibition of the Cdc42 signal efficiently improves mobilization efficiency. These findings may provide a new strategy for efficient HSPC mobilization, especially in patients with poor G-CSF response.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant 81000210, 81471580, 81200376, 81272206, 81270637 and 81370671) and Jiangsu Special Grant of Clinical Science (BL2012022 and BL2013010).
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The authors have no conflicts of interest to declare.
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Chong Chen, Xuguang Song and Sha Ma contributed equally to this paper.
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Chen, C., Song, X., Ma, S. et al. Cdc42 inhibitor ML141 enhances G-CSF-induced hematopoietic stem and progenitor cell mobilization. Int J Hematol 101, 5–12 (2015). https://doi.org/10.1007/s12185-014-1690-z
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DOI: https://doi.org/10.1007/s12185-014-1690-z