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Opposite angiogenic outcome of curcumin against ischemia and lung cancer: in silico, in vitro and in vivo studies

Since many diseases are caused by complex factors, we try to apply the network pharmacology techniques to study the targets and networks of drugs for complex diseases. We investigated the angiogenic effects of curcumin on an ischemia and lung cancer model. To induce ischemia combined with lung cancer models, unilateral femoral arteries of C57BL/6 mice were disconnected on one side of the mouse and Lewis lung carcinoma (LLC) cells were xenografted on the opposite side. Angiogenic effects and underlying mechanisms associated with curcumin were investigated. Molecular target(s), signaling cascades and binding affinities were detected by Western blot, two‐dimensional gel electrophoresis (2‐DE), computer simulations and surface plasmon resonance (SPR) techniques. The results showed that Curcumin promoted post‐ischemic blood recirculation and suppressed lung cancer progression in inbred C57BL/6 mice via regulation of the HIF1α/mTOR/VEGF/VEGFR cascade oppositely. Inflammatory stimulation induced by neutrophil elastase (NE) promoted angiogenesis in lung cancer tissues, but these changes were reversed by curcumin through directly reducing NE secretion and stimulating α1‐antitrypsin (α1‐AT) and insulin receptor substrate‐1 (IRS‐1) production. Meanwhile, curcumin dose‐dependently influenced endothelial cells (EC) tube formation and chicken embryo chorioallantoic membrane (CAM) neovascularization. In conclusion, Curcumin had opposite effects on blood vessel regeneration under physiological and pathological angiogenesis, which was effected through negative or positive regulation of the HIF1α/mTOR/VEGF/VEGFR cascade. Curcumin had the promise as a new treatment modality for both ischemic conditions and lung cancer simultaneously in the clinic.