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The vascular disrupting activity of OXi8006 in endothelial cells and its phosphate prodrug OXi8007 in breast tumor xenografts. | LitMetric

AI Article Synopsis

  • This study investigates OXi8006 and its prodrug OXi8007, which disrupt blood vessel formation by targeting microtubules in rapidly dividing endothelial cells, specifically HUVECs.
  • The mechanism involves increased focal adhesion formation and phosphorylation changes in key proteins, which leads to disruptions in the cytoskeletal network and cell cycle blockage.
  • In vivo testing in breast cancer models shows that OXi8007 significantly reduces blood vessel signals within 6 hours post-treatment, indicating its strong anti-vascular activity.

Article Abstract

This study describes the vascular disrupting ability and the mechanism of action of the indole-based tubulin-binding compound, OXi8006, and its water-soluble phosphate prodrug OXi8007. Treatment of rapidly proliferating human umbilical vein endothelial cells (HUVECs), used as a model for the tumor vasculature, with OXi8006 or OXi8007, caused potent microtubule disruption followed by extensive reorganization of the cytoskeletal network. The mechanism of action involved an increase in focal adhesion formation associated with an increase in phosphorylation of both non-muscle myosin light chain and focal adhesion kinase. These effects were dramatically diminished by an inhibitor of RhoA kinase, a downstream effector of RhoA. Cell cycle blockade at G2/M and cytotoxicity toward rapidly proliferating HUVECs were also observed. Capillary-like networks of HUVECs were disrupted by the action of both OXi8006 and OXi8007. The prodrug OXi8007 exhibited potent and rapid dose-dependent antivascular activity assessed by dynamic bioluminescence imaging (BLI) in an MDA-MB-231-luc breast cancer xenograft mouse model. By 6 hours post treatment, over 93% of the BLI signal was abolished with only a slight recovery at 24 hours. These findings were confirmed by histology. The results from this study demonstrate that OXi8007 is a potent vascular disrupting agent acting through an anti-microtubule mechanism involving RhoA.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4817728PMC
http://dx.doi.org/10.1016/j.canlet.2015.08.021DOI Listing

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