Transendothelial migration of hematopoietic progenitor cells. Role of chemotactic factors
- PMID: 11458515
- DOI: 10.1111/j.1749-6632.2001.tb03571.x
Transendothelial migration of hematopoietic progenitor cells. Role of chemotactic factors
Abstract
There is increasing evidence that hematopoietic stem cell mobilization and homing is regulated not only by adhesion molecules and cytokines, but also by chemotactic factors that support transendothelial migration across the bone marrow sinusoidal endothelium. Many receptors for chemotactic mediators belong to the family of G protein-coupled seven-transmembrane receptors (7-TMR). Signaling via G proteins, particularly Gi proteins, results in a chemotactic response of the cells towards a gradient of the corresponding ligand. Recent studies have provided evidence for expression of several 7-TMR on immature hematopoietic progenitor cells, which potentially mediate chemotactic effects: chemokine receptors (e.g., CXCR4, receptor for stromal cell-derived factor-1), receptors for lipid mediators (e.g., the cysteinyl leukotriene receptor cysLT1 and the peripheral cannabinoid receptor cb2), and receptors for neuroendocrine hormones (e.g., the somatostatin receptor sst2). From these studies it can be concluded that migration of hematopoietic progenitor and stem cells is controlled by a variety of chemotactic factors rather than by a single chemokine (e.g., SDF-1). Trafficking of immature hematopoietic cells may require combined and interactive regulatory functions of these mediators.
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