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Molecular Pharmacology

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Research ArticleArticle

Valproic Acid Inhibits Angiogenesis in Vitro and in Vivo

Martin Michaelis, U. Ruth Michaelis, Ingrid Fleming, Tatyana Suhan, Jaroslav Cinatl, Roman A. Blaheta, Katrin Hoffmann, Rouslan Kotchetkov, Rudi Busse, Heinz Nau and Jindrich Cinatl Jr.
Molecular Pharmacology March 2004, 65 (3) 520-527; DOI: https://doi.org/10.1124/mol.65.3.520
Martin Michaelis
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U. Ruth Michaelis
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Ingrid Fleming
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Tatyana Suhan
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Jaroslav Cinatl
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Roman A. Blaheta
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Katrin Hoffmann
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Rouslan Kotchetkov
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Rudi Busse
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Heinz Nau
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Abstract

Valproic acid (VPA) is a widely used antiepileptic agent that is undergoing clinical evaluation for anticancer therapy. We assessed the effects of VPA on angiogenesis in vitro and in vivo. In human umbilical vein endothelial cells, therapeutically relevant concentrations of VPA (0.25 to 1 mM) inhibited proliferation, migration, and tube formation. VPA 1 mM inhibited endothelial cell proliferation by 51 ± 5%, migration by 86 ± 11%, and tube formation by 82 ± 3%. These changes were preceded by the hyperacetylation of histone H4, indicating the inhibition of histone deacetylase (HDAC), and a decreased expression of the endothelial nitric-oxide synthase (eNOS). The inhibition of endothelial cell tube formation by VPA was prevented by addition of the nitric oxide donor (Z)-1-[2-(2-aminoethyl)-N-(2-ammonioethyl)amino]diazen-1-ium-1,2-diolate (DETA NONOate). The anticonvulsive active VPA derivative 2-ethyl-4-methylpentanoic acid, which does not inhibit HDAC, did not affect endothelial cell proliferation, tube formation, or eNOS expression. VPA was also found to inhibit angiogenesis in vivo in the chicken chorioallantoic membrane assay and in a Matrigel plug assay in mice. Embryos from VPA-treated mice showed disturbed vessel formation. These results indicate that therapeutic plasma levels of VPA inhibit angiogenesis by a mechanism involving a decrease in eNOS expression preceded by HDAC inhibition.

  • Received June 16, 2003.
  • Accepted November 19, 2003.
  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 65 (3)
Molecular Pharmacology
Vol. 65, Issue 3
1 Mar 2004
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Research ArticleArticle

Valproic Acid Inhibits Angiogenesis in Vitro and in Vivo

Martin Michaelis, U. Ruth Michaelis, Ingrid Fleming, Tatyana Suhan, Jaroslav Cinatl, Roman A. Blaheta, Katrin Hoffmann, Rouslan Kotchetkov, Rudi Busse, Heinz Nau and Jindrich Cinatl
Molecular Pharmacology March 1, 2004, 65 (3) 520-527; DOI: https://doi.org/10.1124/mol.65.3.520

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Research ArticleArticle

Valproic Acid Inhibits Angiogenesis in Vitro and in Vivo

Martin Michaelis, U. Ruth Michaelis, Ingrid Fleming, Tatyana Suhan, Jaroslav Cinatl, Roman A. Blaheta, Katrin Hoffmann, Rouslan Kotchetkov, Rudi Busse, Heinz Nau and Jindrich Cinatl
Molecular Pharmacology March 1, 2004, 65 (3) 520-527; DOI: https://doi.org/10.1124/mol.65.3.520
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