AIMS: Homeobox (Hox) proteins are transcriptional regulators in embryonic patterning, cell differentiation, proliferation, and migration in vertebrates and invertebrates. A growing body of evidence suggests that Hox proteins are involved in endothelial cell regulation. We have shown earlier that HoxB5 upregulates vascular endothelial growth factor receptor-2 and thereby contributes to enhanced endothelial precursor cell differentiation. Here we aim to elucidate the role of HoxB5 in angiogenesis. METHODS AND RESULTS: Endothelial cell sprouting was investigated in the human umbilical vein endothelial cell spheroid assay. We investigated in vivo angiogenesis in the chick (Gallus gallus) chorioallantoic membrane assay. Expression profiling of proangiogenic factors was done by quantitative PCR. The angiopoietin-2 (Ang2) promoter and deletion fragments thereof were cloned into the pGL3 reporter system for analysis of transcriptional activity. We observed that HoxB5 enhances endothelial cell sprouting and modulates the expression of adhesion molecules in vitro. Accordingly, we observed a modification of vascular growth by HoxB5 in vivo. The HoxB5 effect is reminiscent of the effects of angiopoietins. We demonstrate that Ang2 is upregulated upon HoxB5 overexpression and that the HoxB5 effect is abolished by the angiopoietin antagonist soluble Tie-2. CONCLUSION: HoxB5 has an activating effect on Ang2 that is essential for endothelial cell sprouting and coordinated vascular growth.
AIMS: Homeobox (Hox) proteins are transcriptional regulators in embryonic patterning, cell differentiation, proliferation, and migration in vertebrates and invertebrates. A growing body of evidence suggests that Hox proteins are involved in endothelial cell regulation. We have shown earlier that HoxB5 upregulates vascular endothelial growth factor receptor-2 and thereby contributes to enhanced endothelial precursor cell differentiation. Here we aim to elucidate the role of HoxB5 in angiogenesis. METHODS AND RESULTS: Endothelial cell sprouting was investigated in the human umbilical vein endothelial cell spheroid assay. We investigated in vivo angiogenesis in the chick (Gallus gallus) chorioallantoic membrane assay. Expression profiling of proangiogenic factors was done by quantitative PCR. The angiopoietin-2 (Ang2) promoter and deletion fragments thereof were cloned into the pGL3 reporter system for analysis of transcriptional activity. We observed that HoxB5 enhances endothelial cell sprouting and modulates the expression of adhesion molecules in vitro. Accordingly, we observed a modification of vascular growth by HoxB5 in vivo. The HoxB5 effect is reminiscent of the effects of angiopoietins. We demonstrate that Ang2 is upregulated upon HoxB5 overexpression and that the HoxB5 effect is abolished by the angiopoietin antagonist soluble Tie-2. CONCLUSION:HoxB5 has an activating effect on Ang2 that is essential for endothelial cell sprouting and coordinated vascular growth.
Authors: Anna Blocki; Yingting Wang; Maria Koch; Priscilla Peh; Sebastian Beyer; Ping Law; James Hui; Michael Raghunath Journal: Stem Cells Dev Date: 2013-05-24 Impact factor: 3.272
Authors: L Díaz-Flores; R Gutiérrez; S Gayoso; M P García; M González-Gómez; L Díaz-Flores; R Sánchez; J L Carrasco; J F Madrid Journal: Histol Histopathol Date: 2020-04-24 Impact factor: 2.303
Authors: Ward De Spiegelaere; Pieter Cornillie; Tim Erkens; Denis Van Loo; Christophe Casteleyn; Mario Van Poucke; Christian Burvenich; Luc Van Hoorebeke; Chris Van Ginneken; Luc Peelman; Wim Van den Broeck Journal: J Histochem Cytochem Date: 2010-08-16 Impact factor: 2.479
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