Published online before print August 15, 2002, doi: 10.1161/01.RES.0000033592.11674.D8
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© 2002 American Heart Association, Inc.
Integrative Physiology |
Interleukin-18/Interleukin-18 Binding Protein Signaling Modulates Ischemia-Induced Neovascularization in Mice Hindlimb
From INSERM U541 (Z.M., J.-S.S., M.C., M.D., A.T., B.I.L.), Hôpital Lariboisière, IFR Circulation-Paris 7, Université Paris 7, France; Institut des vaissseaux et du sang (S.L.R.-R., L.L.-R., V.B., G.T.), Hôpital Lariboisière, Paris, France; Serono Pharmaceutical Research Institute (A.C., Y.C.), Geneva, Switzerland; and the Department of Host Defense (S.A.), Research Institute for Microbial Diseases, Osaka University, Osaka, Japan.
Correspondence to Bernard I. Lévy, MD, PhD, INSERM U 541, Hôpital Lariboisière, 41, Bd de la Chapelle, 75010 Paris, France. E-mail levy{at}infobiogen.fr
Identification of factors that may stimulate ischemia-induced neovascularization without increasing atherosclerotic plaque progression is of major therapeutic importance. We hypothesized that interleukin-18 binding protein (IL-18BP), a major antiinflammatory protein with plaque-stabilizing activities, may affect the neovascularization in mice ischemic hindlimb. Ischemia was produced by artery femoral occlusion in mice that were subjected to in vivo intramuscular electrotransfer of either an empty plasmid or a murine IL-18BP plasmid. Angiographic score, capillary density (CD31 staining), and laser Doppler perfusion data at day 28 showed significant improvement in ischemic/nonischemic leg ratio by respectively 1.6-, 1.4-, and 1.5-fold in IL-18BP–treated mice compared with controls (P<0.01). This was associated with a significant 2-fold increase in both vascular endothelial growth factor (VEGF) and phospho-Akt protein content in the ischemic hindlimb of IL-18BP–treated mice (P<0.05). Similar results were obtained in IL-18–deficient mice. Because bone marrow–derived endothelial progenitor cells (BM-EPCs) are involved in postnatal vasculogenesis, EPCs were isolated and cultivated from bone marrow mononuclear cells. IL-18BP treatment led to a significant 1.8-fold increase in the percentage of BM-EPCs characterized as cells positive for both AcLDL-Dil and von Willebrand factor (P<0.001). In conclusion, IL-18BP stimulates ischemia-induced neovascularization in association with an activation of VEGF/Akt signaling and an increase in BM-EPCs mobilization and differentiation. Our findings strongly suggest a major antiangiogenic role of endogenous IL-18 in postischemic injury.
Key Words: angiogenesis • ischemia • inflammation • interleukin-18 • endothelial progenitor cells
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