title: The histone deacetylase inhibitor NVP-LAQ824 inhibits angiogenesis and has a greater antitumor effect in combination with the vascular endothelial growth factor receptor tyrosine kinase inhibitor PTK787/ZK222584.
abstract: Chromatin remodeling agents such as histone deacetylase inhibitors have been shown to modulate gene expression in tumor cells and inhibit tumor growth and angiogenesis. Vascular endothelial growth factor (VEGF) and VEGF receptors represent critical molecular targets for antiangiogenesis therapy. In this study, we investigated the biological effect of the histone deacetylase inhibitor NVP-LAQ824 in combination with the VEGF receptor tyrosine kinase inhibitor PTK787/ZK222584 on tumor growth and angiogenesis. We report that treatment with NVP-LAQ824 affected tumor and endothelial cells and was associated with increased histone acetylation, p21 up-regulation, and growth inhibition. In addition, NVP-LAQ824 treatment inhibited the expression of angiogenesis-related genes such as angiopoietin-2, Tie-2, and survivin in endothelial cells and down-regulated hypoxia-inducible factor 1-alpha and VEGF expression in tumor cells. Combination treatment with NVP-LAQ824 and PTK787/ZK222584 was more effective than single agents in inhibiting in vitro and in vivo VEGF-induced angiogenesis. Endothelial cell proliferation, tube formation, and invasion into the Matrigel plugs were reduced. In mouse models with established subcutaneous prostate (PC3) and orthotopic breast tumors (MDA-MB321), this combination treatment induced 80 to 85% inhibition of tumor growth without overt toxicity. These results suggest that the combination of histone deacetylase inhibitors and VEGF receptor inhibitors may target multiple pathways in tumor progression and angiogenesis and represents a novel therapeutic approach in cancer treatment.
authors.affiliation: The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, Maryland 21231, USA.
authors.forename: David Z
authors.initials: DZ
authors.lastname: Qian
authors.forename: Xiaofei
authors.initials: X
authors.lastname: Wang
authors.forename: Sushant K
authors.initials: SK
authors.lastname: Kachhap
authors.forename: Yukihiko
authors.initials: Y
authors.lastname: Kato
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: Wei
authors.forename: Lu
authors.initials: L
authors.lastname: Zhang
authors.forename: Peter
authors.initials: P
authors.lastname: Atadja
authors.forename: Roberto
authors.initials: R
authors.lastname: Pili
mesh_terms: D020533:Angiogenesis Inhibitors / Q000008:administration & dosage / Q000494:pharmacology*; D000818:Animals; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000494:pharmacology*; D002417:Cattle; D002455:Cell Division / Q000187:drug effects; D045744:Cell Line, Tumor; D004357:Drug Synergism; D004730:Endothelium, Vascular / Q000166:cytology / Q000187:drug effects; D004791:Enzyme Inhibitors / Q000008:administration & dosage / Q000494:pharmacology; D005786:Gene Expression Regulation / Q000187:drug effects; D056572:Histone Deacetylase Inhibitors; D006801:Humans; D006877:Hydroxamic Acids / Q000008:administration & dosage / Q000494:pharmacology*; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D051379:Mice; D008819:Mice, Nude; D009389:Neovascularization, Pathologic / Q000188:drug therapy / Q000201:enzymology / Q000235:genetics; D010793:Phthalazines / Q000008:administration & dosage / Q000494:pharmacology*; D011725:Pyridines / Q000008:administration & dosage / Q000494:pharmacology*; D014157:Transcription Factors / Q000096:biosynthesis; D042461:Vascular Endothelial Growth Factor A / Q000096:biosynthesis; D040301:Vascular Endothelial Growth Factor Receptor-2 / Q000037:antagonists & inhibitors*; D023041:Xenograft Model Antitumor Assays
chemical_list: D020533:Angiogenesis Inhibitors; D004791:Enzyme Inhibitors; C497442:HIF1A protein, human; D056572:Histone Deacetylase Inhibitors; D006877:Hydroxamic Acids; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; C477361:LAQ824; D010793:Phthalazines; D011725:Pyridines; D014157:Transcription Factors; D042461:Vascular Endothelial Growth Factor A; C404768:vatalanib; D040301:Vascular Endothelial Growth Factor Receptor-2