Ellipticine-induced apoptosis depends on Akt translocation and signaling in lung epithelial cancer cells

Lung Cancer. 2009 Feb;63(2):227-34. doi: 10.1016/j.lungcan.2008.05.026. Epub 2008 Jul 10.

Abstract

Ellipticine and its analogues were reported as topoisomerase II inhibitors and promising antitumor agents. In this work, we showed that the growth of human non-small-cell-lung-cancer (NSCLC) epithelial cells A549 can be inhibited by ellipticine. The inhibitory effect was reverted by PI3K inhibitors. The sub-G(1) phase cells after ellipticine treatment appeared at the expense of those that accumulated first at S- and G(2)/M phases during the early stage of treatment. We showed that the progression leading to cell death was impaired by wortmannin, which reverted apoptosis by retaining cells at S- and G(2)/M transition states. The characteristic apoptosis marker p53 activation after treatment appeared first followed by poly(ADP-ribose)polymerase (PARP) fragmentation. They disappeared upon co-treatment with wortmannin and the apoptotic phenotype reversed. Furthermore, ellipticine regulated endogenous survival signaling by up-regulating phosphorylated Akt that returned to its basal level later. Furthermore, ellipticine induced nucleus translocalization of p53 and Akt and recruitment of autophagosomes. The autophagic-related cell death was interfered by wortmannin and the suppressed growth reverted. The Akt-related cell death also occurred in p53-deficient cells with stable expression of exogenous p53. The work showed that ellipticine-induced cytotoxicity in NSCLC cells was achieved through autophagy and apoptotic death as a result of Akt-modulation. Being a topoisomerase II inhibitor, ellipticine proved a regulator in autophagy-related cell death through corporation of p53 and Akt.

Publication types

  • Research Support, Non-U.S. Gov't
  • Retracted Publication

MeSH terms

  • Active Transport, Cell Nucleus / drug effects
  • Androstadienes / pharmacology
  • Antineoplastic Agents / pharmacology*
  • Apoptosis / drug effects*
  • Autophagy / drug effects
  • Cell Cycle / drug effects
  • Cell Line, Tumor
  • Ellipticines / pharmacology*
  • Humans
  • Lung Neoplasms / drug therapy*
  • Lung Neoplasms / pathology
  • Neoplasms, Glandular and Epithelial / drug therapy*
  • Neoplasms, Glandular and Epithelial / pathology
  • Phosphorylation
  • Protein Transport / drug effects
  • Proto-Oncogene Proteins c-akt / metabolism*
  • Signal Transduction / drug effects*
  • Tumor Suppressor Protein p53 / physiology
  • Wortmannin

Substances

  • Androstadienes
  • Antineoplastic Agents
  • Ellipticines
  • Tumor Suppressor Protein p53
  • ellipticine
  • Proto-Oncogene Proteins c-akt
  • Wortmannin