Ca2+-independent caspase-3 but not Ca2+-dependent caspase-2 activation induced by oxidative stress leads to SH-SY5Y human neuroblastoma cell apoptosis

Salvatore Amoroso, Angela D'Alessio, Rossana Sirabella, Gianfranco Di Renzo, Lucio Annunziato

Research output: Contribution to journalArticle

Abstract

Continuous and long-lasting exposure to tert-butylhydroperoxide (t-BOOH) increased the number of apoptotic SH-SY5Y human neuroblastoma cells both in the presence and in the absence of the intracellular Ca2+ ion chelator 1,2-bis(o-aminophenoxy)ethane-N,N,N′,N′-tetraacetic acid (BAPTA). In addition, t-BOOH exposure induced activation of CPP32, as demonstrated by poly-(ADP-ribose) polymerase (PARP) cleavage, and of ICH-1L caspases. Exposure to t-BOOH also induced a time-dependent release of cytochrome c. Interestingly, in the presence of BAPTA, CPP32 activation still occurred, whereas ICH-1L activation was blocked. Ac-DEVD-CHO, an inhibitor of CPP32 activity, prevented the appearance of apoptotic cells, whereas the inhibitor of ICH-1L activity Z-VDVAD-FMK did not. Collectively, these findings demonstrate that in SH-SY5Y neuroblastoma cells exposure to continuous and long-lasting oxidative stress induced activation of caspase-3 that was independent of intracellular Ca2+ ion concentration ([Ca2+]i) elevation but led to cell apoptosis. In contrast, caspase-2 activation was dependent on [Ca2+]i increase but did not result in apoptosis.

Original languageEnglish
Pages (from-to)454-462
Number of pages9
JournalJournal of Neuroscience Research
Volume68
Issue number4
DOIs
Publication statusPublished - May 15 2002

Keywords

  • Apoptosis
  • CPP32
  • ICH-1L
  • Intracellular Ca ions
  • Oxidative stress

ASJC Scopus subject areas

  • Neuroscience(all)

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