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Angiogenes is therefore appears to be a complex phenomenon, finely regulated by various activators (pro-angiogenic factors) and inhibitors (anti-angiogenic factors). Among the pro-angiogenic factors, VEGF (Vascular Endothelial Growth Factor) seems to be one of the main players in tumor angiogenesis. It exerts its pro-angiogenic activity by attaching to the surface of receptors with tyrosine kinase activity (VEGFR). The aim of this research was the bioinformatical study of VEGFR inhibition by essential oils of the Inula viscosa. Analyses of essential oils obtained by hydrodistillation from the aerial parts of the plant were performed using GC and GC/MS analysis. We used molecular modeling approaches as molecular mechanics to theoretical investigation VEGF receptors by natural inhibitors. Nineteen compounds were identified, constituting 90.1-98.8% of the total essential oils. The main components of the plants were (E)-nerolidol (15.5–20.2 %), caryophyllene oxide (10.6–18.1%), (E)-Z-farnesyl acetone (13.2–25.1%) and (E)-β-farnesene (1.5–5.6%). Essential oil samples were clustered into two groups according to their chemical compositions. The molecular dynamics study was conducted for the best inhibitors. A few key residues were identified at the binding site of VEGFR. The Pharmacokinetics was justified by means of lipophilicity and high coefficient of skin permeability. The  in silico  evaluation of ADME revealed that L19 has high absorption. The essential oil of  I. viscosa  presents a significant variability. This study revealed that (E)-Z-Farnesylacetone is a functional inhibitor of VEGF activities and subsequently can be the best inhibitors candidate to be scrutinized  in vivo  and  in vitro . Communicated by Ramaswamy H. Sarma

Chemical composition variability and vascular endothelial growth factor receptors inhibitory activity of Inulaviscosa essential oils from Algeria