The selective P-TEFb inhibitor CAN508 targets angiogenesis

Eur J Med Chem. 2011 Sep;46(9):4289-94. doi: 10.1016/j.ejmech.2011.06.035. Epub 2011 Jul 3.

Abstract

Small molecule inhibitors of cyclin-dependent kinases (CDK) have been developed as anticancer drugs with cytostatic and cytotoxic properties, but some of them have also been shown to limit angiogenesis. Here, we report that the 3,5-diaminopyrazole CAN508 inhibits endothelial cell migration and tube formation. In addition, it reduces phosphorylation of the C-terminus of RNA polymerase II and inhibits mRNA synthesis in endothelial cells, in accordance with previous observations that it has high selectivity towards the positive transcriptional regulator P-TEFb. Moreover, CAN508 reduces expression of vascular endothelial growth factor by several human cancer cell lines. The findings suggest that P-TEFb may be an attractive target for anti-angiogenic therapy.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Azo Compounds / pharmacology*
  • Cells, Cultured
  • Humans
  • Neovascularization, Pathologic / prevention & control*
  • Phosphorylation
  • Positive Transcriptional Elongation Factor B / antagonists & inhibitors*
  • Protein Kinase Inhibitors / pharmacology*
  • Pyrazoles / pharmacology*
  • RNA Polymerase II / metabolism
  • RNA, Messenger / genetics
  • Transcription, Genetic / drug effects

Substances

  • Azo Compounds
  • CAN 508
  • Protein Kinase Inhibitors
  • Pyrazoles
  • RNA, Messenger
  • Positive Transcriptional Elongation Factor B
  • RNA Polymerase II