The antiproliferative cytostatic effects of a self-activating viridin prodrug Academic Article uri icon


MeSH Major

  • Androstenes
  • Bacteriocins
  • Cell Proliferation
  • Cytostatic Agents
  • Prodrugs


  • Although viridins like wortmannin (Wm) have long been examined as anticancer agents, their ability to self-activate has only recently been recognized. Here, we describe the cytostatic effects of a self-activating viridin (SAV), which is an inactive, polymeric prodrug. SAV self-activates to generate a bioactive, fluorescent viridin NBD-Wm with a half-time of 9.2 hours. With cultured A549 cells, 10 micromol/L SAV caused growth arrest without inducing apoptosis or cell death, a cytostatic action markedly different from other chemotherapeutic agents (vinblastine, camptothecin, and paclitaxel). In vivo, a SAV dosing of 1 mg/kg once in 48 hours (i.p.) resulted in growth arrest of an A549 tumor xenograft, with growth resuming when dosing ceased. With a peak serum concentration of SAV of 2.36 micromol/L (at 2 hours post i.p. injection), the concentration of bioactive NBD-Wm was 41 nmol/L based on the partial inhibition of neutrophil respiratory burst. Therefore, SAV was present as an inactive prodrug in serum (peak = 2.36 micromol/L), which generated low concentrations of active viridin (41 nmol/L). SAV is a prodrug, the slow release and cytostatic activities of which suggest that it might be useful as a component of metronomic-based chemotherapeutic strategies.

publication date

  • June 2009



  • Academic Article



  • eng

PubMed Central ID

  • PMC2740925

Digital Object Identifier (DOI)

  • 10.1158/1535-7163.MCT-08-1012

PubMed ID

  • 19509266

Additional Document Info

start page

  • 1666

end page

  • 75


  • 8


  • 6