Induction of apoptosis and nonsteroidal anti-inflammatory drug-activated gene 1 in pancreatic cancer cells by a glycyrrhetinic acid derivative

Mol Carcinog. 2009 Aug;48(8):692-702. doi: 10.1002/mc.20518.

Abstract

Methyl 2-cyano-3,11-dioxo-18beta-olean-1,12-dien-30-oate (CDODA-Me) is a synthetic triterpenoid derived from glycyrrhetinic acid, a bioactive phytochemical in licorice, CDODA-Me inhibits growth of Panc1 and Panc28 pancreatic cancer cell lines and activates peroxisome proliferator-activated receptor gamma (PPARgamma)-dependent transactivation in these cells. CDODA-Me also induced p21 and p27 protein expression and downregulates cyclin D1; however, these responses were receptor-independent. CDODA-Me induced apoptosis in Panc1 and Panc28 cells, and this was accompanied by receptor-independent induction of the proapoptotic proteins early growth response-1 (Egr-1), nonsteroidal anti-inflammatory drug-activated gene-1 (NAG-1), and activating transcription factor-3 (ATF3). Induction of NAG-1 and Egr-1 by CDODA-Me was dependent on activation of phosphatidylinositol-3-kinase (PI3-K) and/or p42 and p38 mitogen-activated protein kinase (MAPK) pathways but there were differences between Panc28 and Panc1 cells. Induction of NAG-1 in Panc28 cells was p38-MAPK- and PI3-K-dependent but Egr-1-independent, whereas induction in Panc1 cells was associated with activation of p38-MAPK, PI3-K, and p42-MAPK and was only partially Egr-1-dependent. This is the first report of the induction of the proapoptotic protein NAG-1 in pancreatic cancer cells.

Publication types

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

MeSH terms

  • Activating Transcription Factor 3 / metabolism
  • Adipose Tissue / cytology
  • Adipose Tissue / drug effects
  • Adipose Tissue / metabolism
  • Animals
  • Apoptosis / drug effects*
  • Blotting, Western
  • Cell Cycle Proteins / metabolism
  • Cell Differentiation / drug effects
  • Cell Proliferation / drug effects
  • Early Growth Response Protein 1 / metabolism
  • Glycyrrhetinic Acid / analogs & derivatives
  • Glycyrrhetinic Acid / pharmacology*
  • Growth Differentiation Factor 15 / metabolism*
  • Humans
  • Luciferases / metabolism
  • Mice
  • Mitogen-Activated Protein Kinase 1 / metabolism
  • PPAR gamma / metabolism
  • Pancreatic Neoplasms / drug therapy
  • Pancreatic Neoplasms / metabolism
  • Pancreatic Neoplasms / pathology*
  • Phosphatidylinositol 3-Kinases / metabolism
  • Promoter Regions, Genetic
  • Signal Transduction
  • Transfection
  • Tumor Cells, Cultured
  • p38 Mitogen-Activated Protein Kinases / metabolism

Substances

  • Activating Transcription Factor 3
  • Cell Cycle Proteins
  • Early Growth Response Protein 1
  • GDF15 protein, human
  • Growth Differentiation Factor 15
  • PPAR gamma
  • Luciferases
  • Phosphatidylinositol 3-Kinases
  • Mitogen-Activated Protein Kinase 1
  • p38 Mitogen-Activated Protein Kinases
  • Glycyrrhetinic Acid