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FORUM FOR YOUNG TURKS |
a Stem Cell Biology Program at James Graham Brown Cancer Center, University of Louisville, Louisville, Kentucky, USA;
b European Union Stem Cell Therapeutics Excellence Center, CMUJ, Krakow, Poland;
c Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
Key Words. CXCR4 • SDF-1 • Stem cells • Homing • Metastasis
Correspondence: Mariusz Z. Ratajczak, M.D., Ph.D., Director of Stem Cell Biology Program, James Graham Brown Cancer Center, University of Louisville, Louisville, Kentucky 40202, USA. Telephone: 502-852-1788; Fax: 502-852-3032; e-mail: mzrata01{at}louisville.edu
The
-chemokine stromal-derived factor (SDF)-1 and the G-protein–coupled seven-span transmembrane receptor CXCR4 axis regulates the trafficking of various cell types. In this review, we present the concept that the SDF-1–CXCR4 axis is a master regulator of trafficking of both normal and cancer stem cells. Supporting this is growing evidence that SDF-1 plays a pivotal role in the regulation of trafficking of normal hematopoietic stem cells (HSCs) and their homing/retention in bone marrow. Moreover, functional CXCR4 is also expressed on nonhematopoietic tissue-committed stem/progenitor cells (TCSCs); hence, the SDF-1–CXCR4 axis emerges as a pivotal regulator of trafficking of various types of stem cells in the body. Furthermore, because most if not all malignancies originate in the stem/progenitor cell compartment, cancer stem cells also express CXCR4 on their surface and, as a result, the SDF-1–CXCR4 axis is also involved in directing their trafficking/metastasis to organs that highly express SDF-1 (e.g., lymph nodes, lungs, liver, and bones). Hence, we postulate that the metastasis of cancer stem cells and trafficking of normal stem cells involve similar mechanisms, and we discuss here the common molecular mechanisms involved in these processes. Finally, the responsiveness of CXCR4+ normal and malignant stem cells to an SDF-1 gradient may be regulated positively/primed by several small molecules related to inflammation which enhance incorporation of CXCR4 into membrane lipid rafts, or may be inhibited/blocked by small CXCR4 antagonist peptides. Consequently, strategies aimed at modulating the SDF-1–CXCR4 axis could have important clinical applications both in regenerative medicine to deliver normal stem cells to the tissues/organs and in clinical hematology/oncology to inhibit metastasis of cancer stem cells.
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