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Université de Fribourg

Zebrafish caudal fin angiogenesis assay—advanced quantitative assessment including 3-way correlative microscopy

Hlushchuk, Ruslan ; Brönnimann, Daniel ; Shokiche, Carlos Correa ; Schaad, Laura ; Triet, Ramona ; Jazwinska, Anna ; Tschanz, Stefan A. ; Djonov, Valentin

In: PLOS ONE, 2016, vol. 11, no. 3, p. e0149281

Background: Researchers evaluating angiomodulating compounds as a part of scientific projects or pre-clinical studies are often confronted with limitations of applied animal models. The rough and insufficient early-stage compound assessment without reliable quantification of the vascular response counts, at least partially, to the low transition rate to clinics. Objective: To establish an...

Université de Fribourg

Inhibition of Notch signaling induces extensive intussusceptive neo-angiogenesis by recruitment of mononuclear cells

Dimova, Ivanka ; Hlushchuk, Ruslan ; Makanya, Andrew N. ; Styp-Rekowska, Beata ; Ceausu, Amalia ; Flueckiger, Stefanie ; Lang, Sonja ; Semela, David ; Le Noble, Ferdinand ; Chatterjee, Suvro ; Djonov, Valentin

In: Angiogenesis, 2013, p. 1-17

Notch is an intercellular signaling pathway related mainly to sprouting neo- angiogenesis. The objective of our study was to evaluate the angiogenic mechanisms involved in the vascular augmentation (sprouting/intussusception) after Notch inhibition within perfused vascular beds using the chick area vasculosa and MxCreNotch1(lox/lox) mice. In vivo monitoring combined with morphological ...

Université de Fribourg

Decrease in VEGF expression induces intussusceptive vascular pruning

Hlushchuk, Ruslan ; Ehrbar, Martin ; Reichmuth, Philipp ; Heinimann, Niklas ; Styp-Rekowska, Beata ; Escher, Robert ; Baum, Oliver ; Lienemann, Philipp ; Makanya, Andrew N. ; Keshet, Eli ; Djonov, Valentin

In: Arteriosclerosis, Thrombosis, and Vascular Biology, 2011, vol. 31, p. 2836-2844

Objective—The concept of vascular pruning, the “cuting-off” of vessels, is gaining importance due to expansion of angio-modulating therapies. The proangiogenic effects of vascular endothelial growth factor (VEGF) are broadly described, but the mechanisms of structural alterations by its downregulation are not known.Methods and Results—VEGF165-releasing hydrogels were applied onto the...

Université de Fribourg

Everolimus augments the effects of sorafenib in a syngeneic orthotopic model of hepatocellular carcinoma

Piguet, Anne-Christine ; Saar, Bettina ; Hlushchuk, Ruslan ; St-Pierre, Marie V. ; McSheehy, Paul M. ; Radojevic, Vesna ; Afthinos, Maresa ; Terracciano, Luigi ; Djonov, Valentin ; Dufour, Jean-François

In: Molecular Cancer Therapeutics, 2011, vol. 10, no. 6, p. 1007-1017

Sorafenib targets the Raf/mitogen activated protein kinase, VEGF and PDGF pathways and prolongs survival patients in advanced hepatocellular carcinoma (HCC). Everolimus inhibits the mammalian target of rapamycin, a kinase overactive in HCC. To investigate whether the antitumor effects of these agents are additive, we compared a combined and sequential treatment regimen of everolimus and...

Université de Fribourg

Pulsatile shear and Gja5 modulate arterial identity and remodeling events during flow-driven arteriogenesis

Buschmann, Ivo ; Pries, Axel ; Styp-Rekowska, Beata ; Hillmeister, Philipp ; Loufrani, Laurent ; Henrion, Daniel ; Shi, Yu ; Duelsner, Andre ; Hoefer, Imo ; Gatzke, Nora ; Wang, Haitao ; Lehmann, Kerstin ; Ulm, Lena ; Ritter, Zully ; Hauff, Peter ; Hlushchuk, Ruslan ; Djonov, Valentin ; Veen, Toon van ; Le Noble, Ferdinand

In: Development, 2010, vol. 137, p. 2187-2196

In the developing chicken embryo yolk sac vasculature, the expression of arterial identity genes requires arterial hemodynamic conditions. We hypothesize that arterial flow must provide a unique signal that is relevant for supporting arterial identity gene expression and is absent in veins. We analyzed factors related to flow, pressure and oxygenation in the chicken embryo vitelline...

Université de Fribourg

Coronary optical frequency domain imaging (OFDI) for in vivo evaluation of stent healing: comparison with light and electron microscopy

Templin, Christian ; Meyer, Martin ; Müller, Maja Franziska ; Djonov, Valentin ; Hlushchuk, Ruslan ; Dimova, Ivanka ; Flueckiger, Stefanie ; Kronen, Peter ; Sidler, Michele ; Klein, Karina ; Nicholls, Flora ; Ghadri, Jelena-Rima ; Weber, Klaus ; Paunovic, Dragica ; Corti, Roberto ; Hoerstrup, Simon P. ; Lüscher, Thomas F. ; Landmesser, Ulf

In: European Heart Journal, 2010, vol. 31, no. 14, p. 1792-1801

Aims Coronary late stent thrombosis, a rare but devastating complication, remains an important concern in particular with the increasing use of drug-eluting stents. Notably, pathological studies have indicated that the proportion of uncovered coronary stent struts represents the best morphometric predictor of late stent thrombosis. Intracoronary optical frequency domain imaging (OFDI), a novel...

Université de Fribourg

Tumor recovery by angiogenic switch from sprouting to intussusceptive angiogenesis after treatment with PTK787/ZK222584 or ionizing radiation

Hlushchuk, Ruslan ; Riesterer, Oliver ; Baum, Oliver ; Wood, Jeanette ; Gruber, Guenther ; Pruschy, Martin ; Djonov, Valentin

In: American Journal of Pathology, 2009, vol. 173, p. 1173-1185

Inhibitors of angiogenesis and radiation induce compensatory changes in the tumor vasculature both during and after treatment cessation. To assess the responses to irradiation and vascular endothelial growth factor-receptor tyrosine kinase inhibition (by the vascular endothelial growth factor tyrosine kinase inhibitor PTK787/ZK222854), mammary carcinoma allografts were investigated by vascular...

Université de Fribourg

Intussusceptive angiogenesis and its role in vascular morphogenesis, patterning, and remodeling

Makanya, Andrew N. ; Hlushchuk, Ruslan ; Djonov, Valentin

In: Angiogenesis, 2009, vol. 12, no. 2, p. 113-123

New blood vessels arise initially as blood islands in the process known as vasculogenesis or as new capillary segments produced through angiogenesis. Angiogenesis itself encompasses two broad processes, namely sprouting (SA) and intussusceptive (IA) angiogenesis. Primordial capillary plexuses expand through both SA and IA, but subsequent growth and remodeling are achieved through IA. The...