Apoptosis

, 16:1268

Regulation of apoptosis in human melanoma and neuroblastoma cells by statins, sodium arsenite and TRAIL: a role of combined treatment versus monotherapy

Original Paper

DOI: 10.1007/s10495-011-0649-2

Cite this article as:
Ivanov, V.N. & Hei, T.K. Apoptosis (2011) 16: 1268. doi:10.1007/s10495-011-0649-2

Abstract

Treatment of melanoma cells by sodium arsenite or statins (simvastatin and lovastatin) dramatically modified activities of the main cell signaling pathways resulting in the induction of heme oxygenase-1 (HO-1) and in a downregulation of cyclooxygenase-2 (COX-2) protein levels. Through heme degradation and the production of carbon monoxide and biliverdin, HO-1 plays a protective role in different scenario of oxidative stress followed by mitochondrial apoptosis. Both sodium arsenite and statins could be efficient inducers of apoptosis in some melanoma cell lines, but often exhibited only modest proapoptotic activity in others, due to numerous protective mechanisms. We demonstrated in the present study that treatment by sodium arsenite or statins with an additional inhibition of HO-1 expression (or activation) caused a substantial upregulation of apoptosis in melanoma cells. Sodium arsenite- or statin-induced apoptosis was independent of BRAF status (wild type versus V600E) in melanoma lines. Monotreatment required high doses of statins (20–40 μM) for effective induction of apoptosis. As an alternative approach, pretreatment of melanoma cells with statin at decreased doses (5–20 μM) dramatically enhanced TRAIL-induced apoptosis, due to suppression of the NF-κB and STAT3-transcriptional targets (including COX-2) and downregulation of cFLIP-L (a caspase-8 inhibitor) protein levels. Furthermore, combined treatment with sodium arsenite and TRAIL or simvastatin and TRAIL efficiently induced apoptotic commitment in human neuroblastoma cells. In summary, our findings on enhancing effects of combined treatment of cancer cells using statin and TRAIL provide the rationale for further preclinical evaluation.

Keywords

ApoptosisTRAILStatinSodium arseniteMelanomaNeuroblastoma

Abbreviations

COX-2

Cyclooxygenase-2

DR4

Death receptor-4

DR5

Death receptor-5

ERK

Extracellular signal-regulated kinase

FACS

Fluorescence-activated cell sorter

HO-1

Heme oxygenase-1

IETD

N-acetyl-Ile-Glu-Thr-Asp-CHO (aldehyde)

IL1β

Interleukin1β

IL6

Interleukin-6

IκB

Inhibitor of NF-κB

IKK

Inhibitor of nuclear factor kappa B kinase

LEHD

N-acetyl-Leu-Glu-His-Asp-CHO (aldehyde)

MAPK

Mitogen-activated protein kinase

MFI

Medium fluorescence intensity

NF-κB

Nuclear factor kappa B

PI

Propidium iodide

PI3K

Phosphoinositide 3-kinase

PARP-1

Poly (ADP-ribose) polymerase-1

PTGS2

Prostaglandin-endoperoxide synthase 2

ROS

Reactive oxygen species

TNFα

Tumor necrosis factor alpha

TRAIL

TNF-related apoptosis inducing ligand

TRAIL-R

TRAIL-Receptor

zVAD

Carbobenzoxy-valyl-alanyl-aspartyl-[O-methyl]-fluoromethylketone

Supplementary material

10495_2011_649_MOESM1_ESM.ppt (367 kb)
Supplementary material 1 (PPT 367 kb)
10495_2011_649_MOESM2_ESM.ppt (90 kb)
Supplementary material 2 (PPT 90 kb)

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Department of Radiation Oncology, Center for Radiological Research, College of Physicians and SurgeonsColumbia UniversityNew YorkUSA