Metabolic oxidative stress elicited by the copper(II) complex [Cu(isaepy) 2] triggers apoptosis in SH-SY5Y cells through the induction of the AMP-activated protein kinase/p38 MAPK/p53 signalling axis: Evidence for a combined use with 3-bromopyruvate in neuroblastoma treatment

Giuseppe Filomeni, Simone Cardaci, Ana Maria Da Costa Ferreira, Giuseppe Rotilio, Maria Rosa Ciriolo

Research output: Contribution to journalArticle

Abstract

We have demonstrated previously that the complex bis[(2-oxindol-3-ylimino)- 2-(2-aminoethyl)pyridine-N,N′]copper(II), named [Cu(isaepy) 2], induces AMPK (AMP-activated protein kinase)-dependent/p53-mediated apoptosis in tumour cells by targeting mitochondria. In the present study, we found that p38 MAPK (p38 mitogen-activated protein kinase) is the molecular link in the phosphorylation cascade connecting AMPK to p53. Transfection of SH-SY5Y cells with a dominant-negative mutant of AMPK resulted in a decrease in apoptosis and a significant reduction in phospho-active p38 MAPK and p53. Similarly, reverse genetics of p38 MAPK yielded a reduction in p53 and a decrease in the extent of apoptosis, confirming an exclusive hierarchy of activation that proceeds via AMPK/p38 MAPK/p53. Fuel supplies counteracted [Cu(isaepy) 2]-induced apoptosis and AMPK/p38 MAPK/p53 activation, with glucose being the most effective, suggesting a role for energetic imbalance in [Cu(isaepy) 2] toxicity. Co-administration of 3BrPA (3-bromopyruvate), a well-known inhibitor of glycolysis, and succinate dehydrogenase, enhanced apoptosis and AMPK/p38 MAPK/p53 signalling pathway activation. Under these conditions, no toxic effectwas observed in SOD(superoxide dismutase)-overexpressing SH-SY5Y cells or in PCNs (primary cortical neurons), which are, conversely, sensitized to the combined treatment with [Cu(isaepy) 2] and 3BrPA only if grown in low-glucose medium or incubated with the glucose-6-phosphate dehydrogenase inhibitor dehydroepiandrosterone. Overall, the results suggest that NADPH deriving from the pentose phosphate pathway contributes to PCN resistance to [Cu(isaepy) 2] toxicity and propose its employment in combination with 3BrPA as possible tool for cancer treatment.

Original languageEnglish
Pages (from-to)443-453
Number of pages11
JournalBiochemical Journal
Volume437
Issue number3
DOIs
Publication statusPublished - Aug 1 2011

Keywords

  • 3-Bromopyruvate
  • AMP-activated protein kinase (AMPK)
  • Delocalized lipophilic cation
  • Neuroblastoma
  • p38 mitogen-activated protein kinase (p38 )
  • p53

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Fingerprint Dive into the research topics of 'Metabolic oxidative stress elicited by the copper(II) complex [Cu(isaepy) 2] triggers apoptosis in SH-SY5Y cells through the induction of the AMP-activated protein kinase/p38 MAPK/p53 signalling axis: Evidence for a combined use with 3-bromopyruvate in neuroblastoma treatment'. Together they form a unique fingerprint.

  • Cite this