Article (Scientific journals)
Cell cycle activation of hematopoietic progenitor cells increases very late antigen-5-mediated adhesion to fibronectin.
Giet, Olivier; Huygen, Sandra; Beguin, Yves et al.
2001In Experimental Hematology, 29 (4), p. 515-24
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Keywords :
Adult; Antigens, CD34/analysis; Binding Sites; Cell Adhesion; Cell Cycle/physiology; Cell Division; Cell Separation; Cells, Cultured; Fibronectins/metabolism; Hematopoietic Stem Cells/cytology/metabolism; Humans; Integrin alpha4beta1; Integrins/metabolism; Membrane Proteins/pharmacology; Receptors, Fibronectin/physiology; Receptors, Lymphocyte Homing/metabolism; Stem Cell Factor/pharmacology; Thrombopoietin/pharmacology; Vascular Cell Adhesion Molecule-1/metabolism
Abstract :
[en] Recent studies suggested that trafficking of hematopoietic progenitor cells is related to cell cycle status. We studied whether adhesion of progenitor cells to extracellular matrix proteins was modulated by cell cycle transit.Mobilized peripheral blood CD34+ cells were stimulated ex vivo for 48 hours with stem cell factor, flt-3 ligand, and thrombopoietin and fractionated by adhesion to fibronectin or vascular cell adhesion molecule-1 (VCAM-1). Adherent and nonadherent cells were assayed for cell cycle status, long-term culture-initiating cell frequency, and integrin function. Binding to fibronectin, but not to VCAM-1, displayed a cell cycle selectivity as the adherent fraction to fibronectin was enriched in cycling CD34+ cells and in cycling long-term culture-initiating cells compared to the nonadherent fraction. Combined cell cycle and phenotypic analysis showed that the expression of VLA-5 was upregulated during S/G2+M but that of VLA-4 remained constant. The selective binding of cycling CD34+ cells to fibronectin was reverted by anti-VLA-5 but not by anti-VLA-4 blocking antibodies. Also, cycling CD34+ cells preferentially adhered to the VLA-5 binding domain but not to the VLA-4 binding domain of fibronectin. Adhesion of cycling CD34+ cells to fibronectin was a reversible process modulated by cell cycle progression, because adherent cells could exit the cell cycle and return to a nonadhesive state within an additional 48-hour culture period.The results indicate that the enhanced binding capacity of cycling progenitor cells to fibronectin is mediated by VLA-5.
Disciplines :
Hematology
Author, co-author :
Giet, Olivier ;  Centre Hospitalier Universitaire de Liège - CHU > Hématologie clinique
Huygen, Sandra
Beguin, Yves  ;  Centre Hospitalier Universitaire de Liège - CHU > Hématologie clinique
Gothot, André ;  Centre Hospitalier Universitaire de Liège - CHU > Hématologie biologique et immuno hématologie
Language :
English
Title :
Cell cycle activation of hematopoietic progenitor cells increases very late antigen-5-mediated adhesion to fibronectin.
Publication date :
2001
Journal title :
Experimental Hematology
ISSN :
0301-472X
eISSN :
1873-2399
Publisher :
Elsevier, Amsterdam, Netherlands
Volume :
29
Issue :
4
Pages :
515-24
Peer reviewed :
Peer reviewed
Available on ORBi :
since 19 February 2009

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