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The Journal of Immunology, Vol 153, Issue 10 4673-4683, Copyright © 1994 by American Association of Immunologists

ARTICLES

Signals from platelet/endothelial cell adhesion molecule enhance the adhesive activity of the very late antigen-4 integrin of human CD34+ hemopoietic progenitor cells

DI Leavesley, JM Oliver, BW Swart, MC Berndt, DN Haylock and PJ Simmons
Matthew Roberts Laboratory, Hanson Centre for Cancer Research, Adelaide, Australia.

Adhesive interactions between human CD34+ hemopoietic progenitor cells and bone marrow stromal cells control the localization, proliferation, and differentiation of CD34+ cells. Changes in adhesive interactions may contribute to the mobilization of CD34+ cells to the blood induced by chemotherapy and cytokines. Thus, the identities and functional states of adhesion receptors are critical properties of CD34+ cells. Here, we confirm that the adhesion receptors very late antigen-4 (VLA- 4), LFA-1, and platelet/endothelial cell adhesion molecule-1 (PECAM-1) are expressed on the CD34+ cell line KG1a and on CD34+ normal, steady state bone marrow cells. Therapeutically mobilized CD34+ cells express similar levels of PECAM-1 but reduced levels of VLA-4 and LFA-1 in comparison with steady state bone marrow cells. Integrin adhesive activity was measured from the binding of PKH 26- or phycoerythrin- labeled CD34+ cells to FITC-labeled Chinese hamster ovary (CHO) cells expressing vascular CAM-1 (VCAM-1) or intercellular CAM-1, which are ligands for VLA-4 and LFA-1, respectively. Incubation mixtures were analyzed by flow cytometry for the loss of free CD34+ cells and gain of CD34(+)-CHO cell aggregates. VLA-4 mediates the strong and specific adhesion of KG1a cells and bone marrow CD34+ cells to VCAM-1- transfected CHO cells. CD34+ cells mobilized with granulocyte colony stimulating factor (G-CSF) or cyclophosphamide also bind VCAM-1 via VLA- 4. The VLA-4-mediated adhesion of all CD34+ cells to VCAM-1 is enhanced by Abs to the coexpressed adhesion receptor PECAM-1, implicating signals transmitted from PECAM-1 as determinants of VLA-4 integrin activity. VLA-4 function in CD34+ cells mobilized with G-CSF or cyclophosphamide is equivalent to steady state CD34+ cells. LFA-1 mediates minimal adhesion between CD34+ cells and intercellular CAM-1 transfected CHO cells and is refractory to PECAM-1 modulation. We infer that VLA-4, but not LFA-1, contributes to the constitutive adhesive phenotype of CD34+ cells. PECAM-1 is probably one of several receptors that control adhesive interactions between hemopoietic progenitors and target cells by regulating the activation states of specific integrins.


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