Effect of 15-lipoxygenase metabolites, 15-(S)-HPETE and 15-(S)-HETE on chronic myelogenous leukemia cell line K-562: Reactive oxygen species (ROS) mediate caspase-dependent apoptosis

Suraneni V.K. Mahipal, Jagu Subhashini, Madhava C. Reddy, Metukuri M. Reddy, Kotha Anilkumar, Karnati R. Roy, Gorla V. Reddy, Pallu Reddanna

Research output: Contribution to journalArticle

Abstract

Growth inhibitory effects of 15-lipoxygenase-1 [13-(S)-HPODE and 13-(S)-HODE] and 15-lipoxygenase-2 [15-(S)-HPETE and 15-(S)-HETE] (15-LOX-1 and LOX-2) metabolites and the underlying mechanisms were studied on chronic myeloid leukemia cell line (K-562). The hydroperoxy metabolites, 15-(S)-HPETE and 13-(S)-HPODE rapidly inhibited the growth of K-562 cells by 3 h with IC50 values, 10 and 15 μM, respectively. In contrast, the hydroxy metabolite of 15-LOX-2, 15-(S)-HETE, showed 50% inhibition only at 40 μM by 6 h and 13-(S)-HODE, hydroxy metabolite of 15-LOX-1, showed no significant effect up to 160 μM. The cells exposed to 10 μM of 15-(S)-HPETE and 40 μM of 15-(S)-HETE showed typical apoptotic features like release of cytochrome c, caspase-3 activation and PARP-1 (poly(ADP) ribose polymerase-1) cleavage. A flow cytometry based DCFH-DA analysis and inhibitory studies with DPI, a pharmacological inhibitor of NADPH oxidase, NAC (N-acetyl cysteine) and GSH revealed that NADPH oxidase-mediated generation of ROS is responsible for caspase-3 activation and subsequent induction of apoptosis in the K-562 cell line.

Original languageEnglish (US)
Pages (from-to)202-214
Number of pages13
JournalBiochemical Pharmacology
Volume74
Issue number2
DOIs
StatePublished - Jul 15 2007

Keywords

  • 15-(S)-HETE
  • 15-(S)-HPETE
  • 15-Lipoxygenase
  • Apoptosis
  • ROS

ASJC Scopus subject areas

  • Biochemistry
  • Pharmacology

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