Radiosensitizing potential of Plumbagin in B16F1 melanoma tumor cells through mitochondrial mediated programmed cell death

Bola Sadashiva Satish Rao, Mandala Rayabandla Sunil Kumar, Shubhankar Das, Kiran Aithal, Nayanabhirama Udupa

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


The radiosensitizing potential of Plumbagin (PLB) against chemo- and radioresistant B16F1 melanoma cells growing in vitro was investigated. Clonogenic assay revealed a sensitization enhancement ratio (SER) of 1.5 for PLB treatment in combination with radiation. PLB pretreatment for 1 h prior to radiation resulted in elevated intracellular ROS levels compared to the group treated with radiation alone. Alkaline comet assay analysis revealed PLB's potential to enhance the radiation induced DNA damage. Cell cycle studies have shown enhanced G2/M arrest for combination treatment of PLB with radiation. Cell death exerted by PLB combination was mainly through programmed cell death, involving the depletion of mitochondrial membrane potential, increase in the expression of p53, Bax, Cytochrome c, PARP and Caspase 3 cleavage. In conclusion, this study demonstrates the radiosensitizing potential of PLB to inhibit the growth of melanoma cells in vitro, which may be attributed to the oxidative stress and DNA damage leading to enhanced mitochondria-mediated programmed cell death. Also, this study demonstrate the ability of PLB to augment ionizing radiation induced tumor cell kill which further warrant the avenue for the development of a clinically useful radiosensitizer.

Original languageEnglish
Pages (from-to)279-288
Number of pages10
JournalJournal of Applied Biomedicine
Issue number4
Publication statusPublished - 01-11-2015

All Science Journal Classification (ASJC) codes

  • General Neuroscience
  • General Medicine
  • General Biochemistry,Genetics and Molecular Biology
  • General Agricultural and Biological Sciences
  • Pharmacology, Toxicology and Pharmaceutics(all)


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