Anti-LFA-1 blocking antibodies prevent mobilization of hematopoietic progenitor cells induced by interleukin-8 - PubMed (original) (raw)
. 1998 Jun 1;91(11):4099-105.
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- PMID: 9596655
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Anti-LFA-1 blocking antibodies prevent mobilization of hematopoietic progenitor cells induced by interleukin-8
J F Pruijt et al. Blood. 1998.
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Abstract
Previously, we have shown that interleukin (IL)-8 induces the rapid (15 to 30 minutes) mobilization of hematopoietic progenitor cells (HPC) in mice. Because integrins are essential for adhesion and transendothelial migration of HPC, we studied the involvement of the beta2-integrin leukocyte function-associated antigen-1 (LFA-1) in IL-8-induced mobilization. After a single injection of blocking anti-LFA-1 antibodies, no mobilization of colony-forming cells was observed. In addition, when mice were pretreated with anti-LFA-1 or saline and subsequently injected with 30 microg of IL-8, mobilization of HPC was completely blocked. We showed that this was not due to anti-LFA-1 antibodies affecting colony formation, as addition of anti-LFA-1 antibodies to colony cultures in semisolid medium had no inhibitory activity. Also, anti-intercellular adhesion molecule (ICAM)-1 antibodies, directed to the main ligand of LFA-1 significantly inhibited the IL-8-induced mobilization. Furthermore, IL-1-induced mobilization was significantly inhibited by anti-LFA-1 antibodies. Because LFA-1 is reported to be expressed on more differentiated HPC, it was considered that the IL-8-induced mobilization of more primitive HPC would not be blocked by anti-LFA-1 antibodies. Transplantation of blood-derived mononuclear cells (MNC) from IL-8-mobilized animals pretreated with anti-LFA-1 antibodies protected only 25% of lethally irradiated recipient mice, whereas the radioprotection rate of control mice transplanted with MNC derived from IL-8-mobilized animals was 86% (P < .01). Anti-LFA-1 antibodies did not interfere with stem cell homing, as transplantation of IL-8-mobilized blood MNC, incubated in vitro with these antibodies resulted in 100% radioprotection. We conclude that anti-LFA-1 antibodies completely prevent the rapid mobilization of colony-forming cells and of cells with radioprotective capacity induced by IL-8. These results indicate a major role for the beta2-integrin LFA-1 in the IL-8-induced mobilization of hematopoietic stem cells.
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