ON01910, a non-ATP-competitive small molecule inhibitor of Plk1, is a potent anticancer agent

Cancer Cell. 2005 Mar;7(3):275-86. doi: 10.1016/j.ccr.2005.02.009.


Elevated expression of polo-like kinase1 (Plk1) has been reported in many human tumors, and inhibition of Plk1 activity results in their mitotic arrest and apoptosis. Here we describe the profile of ON01910, a small molecule inhibitor of Plk1 activity, which induces mitotic arrest of tumor cells characterized by spindle abnormalities leading to their apoptosis. This compound was not ATP-competitive, but competed for the substrate binding site of the enzyme. In vivo, this compound did not exhibit hematotoxicity, liver damage, or neurotoxicity, and was a potent inhibitor of tumor growth in a variety of xenograft nude mouse models. ON01910 showed strong synergy with several chemotherapeutic agents, often inducing complete regression of tumors.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenosine Triphosphate / metabolism
  • Animals
  • Antineoplastic Agents / chemistry
  • Antineoplastic Agents / metabolism
  • Antineoplastic Agents / pharmacology*
  • Antineoplastic Agents / toxicity
  • Apoptosis
  • Cell Cycle / physiology
  • Cell Cycle Proteins / genetics
  • Cell Cycle Proteins / metabolism*
  • Cell Line, Tumor
  • Dose-Response Relationship, Drug
  • Female
  • Humans
  • Mice
  • Mice, Nude
  • Molecular Structure
  • Neoplasms, Experimental / metabolism
  • Protein Kinase Inhibitors / chemistry
  • Protein Kinase Inhibitors / metabolism
  • Protein Kinase Inhibitors / pharmacology*
  • Protein Kinase Inhibitors / toxicity
  • Protein Kinases / genetics
  • Protein Kinases / metabolism*
  • Protein Serine-Threonine Kinases
  • Proto-Oncogene Proteins / genetics
  • Proto-Oncogene Proteins / metabolism*
  • Spindle Apparatus / drug effects*
  • Spindle Apparatus / metabolism


  • Antineoplastic Agents
  • Cell Cycle Proteins
  • Protein Kinase Inhibitors
  • Proto-Oncogene Proteins
  • Adenosine Triphosphate
  • Protein Kinases
  • Protein Serine-Threonine Kinases
  • polo-like kinase 1