Autophagic cell death of human pancreatic tumor cells mediated by oleandrin, a lipid-soluble cardiac glycoside

Integr Cancer Ther. 2007 Dec;6(4):354-64. doi: 10.1177/1534735407309623.

Abstract

Lipid-soluble cardiac glycosides such as bufalin, oleandrin, and digitoxin have been suggested as potent agents that might be useful as anticancer agents. Past research with oleandrin, a principle cardiac glycoside in Nerium oleander L. (Apocynaceae), has been shown to induce cell death through induction of apoptosis. In PANC-1 cells, a human pancreatic cancer cell line, cell death occurs not through apoptosis but rather through autophagy. Oleandrin at low nanomolar concentrations potently inhibited cell proliferation associated with induction of a profound G(2)/M cell cycle arrest. Inhibition of cell cycle was not accompanied by any significant sub G1 accumulation of cells, suggesting a nonapoptotic mechanism. Oleandrin-treated cells exhibited time- and concentration-dependent staining with acridine orange, a lysosomal stain. Subcellular changes within PANC-1 cells included mitochondrial condensation and translocation to a perinuclear position accompanied by vacuoles. Use of a fluorescent oleandrin analog (BODIPY-oleandrin) revealed co-localization of the drug within cell mitochondria. Damaged mitochondria were found within autophagosome structures. Formation of autophagosomes was confirmed through electron microscopy and detection of green fluorescent protein-labeled light chain 3 association with autophagosome membranes. Also observed was a drug-mediated inhibition of pAkt formation and up-regulation of pERK. Transfection of Akt into PANC-1 cells or inhibition of pERK activation by MAPK inhibitor abrogated oleandrin-mediated inhibition of cell growth, suggesting that the reduction of pAkt and increased pERK are important to oleandrin's ability to inhibit tumor cell proliferation. The data provide insight into the mechanisms and role of a potent, lipid-soluble cardiac glycoside (oleandrin) in control of human pancreatic cancer proliferation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antineoplastic Agents / pharmacology
  • Autophagy / drug effects*
  • Blotting, Western
  • Cardenolides / analysis
  • Cardenolides / chemistry
  • Cardenolides / pharmacology*
  • Cardiac Glycosides / analysis
  • Cardiac Glycosides / chemistry
  • Cardiac Glycosides / pharmacology*
  • Cell Cycle / drug effects
  • Cell Line, Tumor
  • Cell Proliferation / drug effects
  • Dose-Response Relationship, Drug
  • Extracellular Signal-Regulated MAP Kinases / antagonists & inhibitors
  • Humans
  • Lipids / chemistry
  • Microscopy, Electron, Transmission
  • Microtubule-Associated Proteins / genetics
  • Microtubule-Associated Proteins / metabolism
  • Mitochondria / chemistry
  • Mitochondria / drug effects
  • Mitochondria / ultrastructure
  • Molecular Structure
  • Organic Chemicals / pharmacology
  • Pancreatic Neoplasms / metabolism
  • Pancreatic Neoplasms / pathology
  • Phosphorylation / drug effects
  • Protein Kinase Inhibitors / pharmacology
  • Proto-Oncogene Proteins c-akt / genetics
  • Proto-Oncogene Proteins c-akt / metabolism
  • Signal Transduction / drug effects
  • Solubility
  • Transfection

Substances

  • Antineoplastic Agents
  • Cardenolides
  • Cardiac Glycosides
  • Lipids
  • Microtubule-Associated Proteins
  • Organic Chemicals
  • PD 98058
  • Protein Kinase Inhibitors
  • light chain 3, human
  • Proto-Oncogene Proteins c-akt
  • Extracellular Signal-Regulated MAP Kinases
  • oleandrin