Published online before print November 4, 2002, doi: 10.1161/01.CIR.0000039342.85015.5C
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(Circulation. 2002;106:3097.)
© 2002 American Heart Association, Inc.
Basic Science Reports |
FrzA, a Secreted Frizzled Related Protein, Induced Angiogenic Response
From Inserm U441, Pessac; Biochemistry Laboratory (P.D.), University of Bordeaux 2; and Department of Cardiology (T.C.), Hôpital Haut Lévêque, Pessac, France.
Correspondence to Pascale Dufourcq, PhD, Inserm U441, Avenue du Haut Lévêque, 33600 Pessac, France. E-mail pascale.dufourcq{at}biophar.u-bordeaux2.fr
Background— The secreted frizzled related proteins (sFRP) are soluble proteins thought to interfere with the Wnt signaling. Our group previously demonstrated that one of these members, sFRP-1/FrzA, is strongly expressed during early phases of the vascularization process in embryonic vasculature and in the endothelium of arteries and capillaries in adults and modulated vascular cell proliferation.
Methods and Results— Analysis of the expression of sFRP-1 during cyclic ovarian angiogenesis revealed that sFRP-1 is expressed during the formation of neovessels and becomes undetectable when the vasculature is fully maturated. We then studied the role of FrzA in several distinct angiogenic models. FrzA induced angiogenesis in a chick chorioallantoic membrane model. Moreover, gene transfer of AdFrzA in grafted mesenchymal and glioma cells increased vessel density and tumor growth. FrzA induced formation of vessels, which were enlarged, longer, and appeared to be more mature compared with vessels formed under control treatments. In vitro, FrzA increased migration and tube formation of endothelial cells and seemed to protect them from apoptosis. FrzA-angiogenic effect in vitro was independent of vascular endothelial growth factor, fibroblast growth factor-2, or angiopiotin-1 induction and Akt activation. In contrast, FrzA decreased glycogen synthase kinase-3 phosphorylation.
Conclusions— These results showed that FrzA has proangiogenic effects and suggest that Wnt signaling may be involved in normal differentiation as well as in the pathological development of vasculature.
Key Words: angiogenesis • endothelium • muscle, smooth
Related Article:
Circulation 2002 106: 3002-3005.
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