Selenium-containing histone deacetylase inhibitors for melanoma management

Cancer Biol Ther. 2012 Jul;13(9):756-65. doi: 10.4161/cbt.20558. Epub 2012 Jun 6.


Melanoma incidence and mortality rates continue to increase each year. Lack of clinically viable agents, drug combinations, effective targeted delivery approaches and success inhibiting targets in tumor tissue have made this disease one of the most difficult to treat, which makes prevention an important option for decreasing disease incidence and mortality rates. Inhibiting histone deacetylases (HDAC) is an approach currently being explored to more effectively treat melanoma but use for prevention has not been explored. In this study, novel selenium containing derivatives of the FDA approved HDAC inhibitor suberoylanilide hydroxamic acid (SAHA) called 5-phenylcarbamoylpentyl selenocyanide (PCP-SeCN) and Bis{5-phenylcarbamoylpentyl} diselenide (B(PCP)-2Se) were created and efficacy tested for preventing early melanocytic lesion development in skin. Topical application of PCP-SeCN and B(PCP)-2Se inhibited melanocytic lesion development in laboratory-generated skin by up to 87% with negligible toxicological effect. Mechanistically, PCP-SeCN and B(PCP)-2Se inhibited HDAC activity and had new inhibitory properties by moderating Akt activity to induce cellular apoptosis as demonstrated by an increase in the sub-G₀-G₁ cell population, and cleaved caspase-3 as well as PARP levels. Furthermore, PCP-SeCN and B(PCP)-2Se inhibited cell proliferation by inhibiting cyclin D1 expression and increasing p21 levels. Thus, PCP-SeCN and B(PCP)-2Se are potential melanoma chemopreventive agents with enhanced efficacy compared with SAHA due to new PI3 kinase pathway inhibitory properties.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anilides / pharmacology*
  • Anticarcinogenic Agents / pharmacology*
  • Apoptosis / drug effects
  • Caspase 3 / metabolism
  • Caspase 7 / metabolism
  • Cell Cycle Checkpoints / drug effects
  • Cell Line, Tumor
  • Cell Proliferation / drug effects
  • Histone Deacetylase Inhibitors / pharmacology*
  • Histone Deacetylase Inhibitors / therapeutic use
  • Humans
  • Hydroxamic Acids / pharmacology*
  • Inhibitory Concentration 50
  • Melanoma / prevention & control*
  • Organoselenium Compounds / pharmacology*
  • Phosphatidylinositol 3-Kinases / metabolism
  • Signal Transduction
  • Skin Neoplasms / prevention & control*
  • Tissue Culture Techniques
  • Vorinostat


  • 5-phenylcarbamoylpentyl selenocyanide
  • Anilides
  • Anticarcinogenic Agents
  • Histone Deacetylase Inhibitors
  • Hydroxamic Acids
  • Organoselenium Compounds
  • bis(5-phenylcarbamoylpentyl) diselenide
  • Vorinostat
  • Phosphatidylinositol 3-Kinases
  • CASP3 protein, human
  • CASP7 protein, human
  • Caspase 3
  • Caspase 7