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Rhoa Gtpase Inactivation by Statins Induces Osteosarcoma Cell Apoptosis by Inhibiting P42/P44- Mapks-Bcl-2 Signaling Independently of BMP-2 and Cell Differentiation

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Rhoa Gtpase Inactivation by Statins Induces Osteosarcoma Cell Apoptosis by Inhibiting P42/P44- Mapks-Bcl-2 Signaling Independently of BMP-2 and Cell Differentiation Cell Death and Differentiation (2006) 13, 1845–1856 & 2006 Nature Publishing Group All rights reserved 1350-9047/06 $30.00 www.nature.com/cdd RhoA GTPase inactivation by statins induces osteosarcoma cell apoptosis by inhibiting p42/p44- MAPKs-Bcl-2 signaling independently of BMP-2 and cell differentiation O Fromigue´ 1, E Hay¨ 1, D Modrowski1, S Bouvet1, A Jacquel2, geranylgeranylpyrophosphate; HMG-CoA, 3-hydroxy 3-methyl- P Auberger2 and PJ Marie*,1 glutaryl coenzyme A; MAPKs, mitogen-activated protein kinases; PI3K, phosphoinositide 30 kinase; NO, nitric oxide; RT-PCR, 1 INSERM U606, University Paris 7, IFR 139, Lariboisie`re Hospital, 2 rue reverse transcription-polymerase chain reaction; TBST, tris Ambroise Pare´, 75475 Paris Cedex 10, France hydroxymethylaminomethane buffered saline Tween-20; WT, 2 INSERM U526, Faculty of Medicine Pasteur, Equipe labellise´e LNC, IFR 50, wild-type form; zVAD-fmk, z-Val-Ala-Asp-fluoromethylketone Nice, France * Corresponding author: PJ Marie, INSERM Unit 606, Hoˆpital Lariboisie`re, 2 rue Ambroise Pare´, 75475 Paris cedex 10, France. Tel: þ 33-1-49-95-63-89; Fax: þ 33-1-49-95-84-52; E-mail: [email protected] Introduction Osteosarcoma is the most common primary malignant bone Received 29.8.05; revised 20.12.05; accepted 20.12.05; published online 10.2.06 tumour occuring in children and young adults. Although Edited by SH Kaufmann aggressive chemotherapy has improved the prognosis of osteosarcoma patients, resistance to chemotherapy remains Abstract a major mechanism responsible for the failure of osteo- sarcoma treatment.1 Several studies have established that Osteosarcoma is the most common primary bone tumour apoptotic pathways contribute to the cytotoxic action of in young adults. Despite improved prognosis, resistance to chemotherapeutic drugs.2,3 Thus, combinational therapy with chemotherapy remains responsible for failure of osteo- agents that promote the apoptotic machinary may be of sarcoma treatment. The identification of signals that promote potential interest to enhance apoptosis sensitivity and apoptosis may provide clues to develop new therapeutic improve tumour burden.3,4 strategies for chemoresistant osteosarcoma. Here, we show The cholesterol-lowering agents statins were recently found 5,6 that lipophilic statins (atorvastatin, simvastatin, cerivastatin) to trigger cell death in a variety of soft tumour cells. Statins markedly induce caspases-dependent apoptosis in various inhibit the 3-hydroxy-3-methylglutaryl-coenzyme A (HMG CoA) reductase which catalyses the conversion of HMG- human osteosarcoma cells, independently of bone morpho- CoA into mevalonate during the biosynthesis of cholesterol. genetic protein (BMP)-2 signaling and cell differentiation. Mevalonate can be converted into farnesylpyrophosphate Although statins increased BMP-2 expression, the proapop- (FPP) and geranylgeranylpyrophosphate (GGPP), two iso- totic effect of statins was not prevented by the BMP prenoid residues that can be anchored onto several intracel- antagonist noggin, and was abolished by mevalonate and lular proteins through farnesylation or geranylgeranylation, a geranylgeranylpyrophosphate, suggesting the involvement of process called prenylation.5,6 Protein prenylation is necessary defective protein geranylgeranylation. Consistently, lipophilic for relocalization of target proteins to cell membranes, and statins induced membrane RhoA relocalization to the cytosol is thereby involved in the control of cell adhesion, growth and and inhibited RhoA activity, which resulted in decreased survival. Blocking the mevalonate pathway by HMG-CoA phospho-p42/p44- mitogen-activated protein kinases reductase inhibitors inhibits geranylgeranylation and farnesy- (MAPKs) and Bcl-2 levels. Constitutively active RhoA rescued lation, resulting in decreased prenylation of proteins and alteration of cell growth and survival functions.5 Small G- phospho-p42/p44-MAPKs and Bcl-2 and abolished statin- proteins, including the Ras, Rho and Rac families are induced apoptosis. Thus, lipophilic statins induce caspase- signaling proteins that are dependent on prenylation for their dependent osteosarcoma cell apoptosis by a RhoA-p42/p44 localization to cell membranes and for their activity.7 Notably, MAPKs-Bcl-2-mediated mechanism, independently of BMP-2 RhoA has been implicated in the control of cell growth and signaling and cell differentiation. apoptosis.7,8 Moreover, RhoA is overexpressed in several Cell Death and Differentiation (2006) 13, 1845–1856. tumours,9 suggesting its possible implication in tumorigen- doi:10.1038/sj.cdd.4401873; published online 10 February 2006 esis. However, the contribution of RhoA in osteosarcoma cell survival and its downstream signaling proteins has not been Keywords: apoptosis; osteosarcoma; statins; RhoA; MAPKs determined. The terminal differentiation of cells of the osteoblast lineage Abbreviations: Ac-DEVD-pNA, acetyl-Asp-Glu-Val-Asp-para- is directed by the integrated function of regulatory factors such nitroaniline; BMP, bone morphogenetic protein; BMPR-IB, BMP as bone morphogenetic proteins (BMPs) and downstream receptor IB; BSA, bovin serum albumin; CA, constitutively active transcription factors. BMP-2, a member of the TGF beta form; FCS, fetal calf serum; FPP, farnesylpyrophosphate; superfamily, and Runx2, a master transcription factor acting GAPDH, glyceraldehyde 3-phosphate deshydrogenase; GGPP, as BMP effector, are important regulatory signals required for RhoA mediates osteosarcoma cell apoptosis O Fromigue´ et al 1846 osteoblast differentiation.10,11 Runx2 promotes the expres- cell viability by induction of programmed cell death, we sion of phenotypic markers in postproliferative osteo- evaluated caspase activity in osteosarcoma cells treated blasts11,12 and induces suppression of preosteoblastic cell with statins. As shown in Figure 1c, lipophilic statins (10 mM) proliferation,13,14 which contributes to promote osteoblast induced a eight- to 12-fold increase in caspase-3 like activity maturation. Osteosarcoma cells are often characterized by at 24 h in SaOS2 cells. Again, pravastatin had no significant loss of differentiated phenotype with decreased expression of effect. Similarly, lipophilic statins induced a four- to 35-fold 15 osteoblast markers. Consistently, osteoblast differentiation increase in caspase-3 like activity in OHS4 cells (Figure 1c). mediated by Runx2 and the cyclin-dependent kinase (Cdk) This effect was not restricted to these two cell lines because inhibitor p27 (Kip1) is disrupted in osteosarcoma cells.16 statins increased caspase-3 like activity by up to 25-fold in Additionally, the upregulation of Runx2 with cessation of cell three other osteosarcoma cell lines which exhibit different growth observed in normal osteoblasts13 is not observed in characteristics (Table 2). Notably, statins increased caspase- osteosarcoma cells,14,17 indicating a role for Runx2 dysregu- 3 like activity in CAL-72 cells that are resistant to various lation in osteosarcoma cell proliferation and differentiation. chemotherapies.22 We also found that lipophilic statins We previously showed that, besides promoting Runx2 and increased caspase-9 activity at an early time point (15 h), cell differentiation, BMP-2 induces caspase-dependent apop- whereas caspase-8 activity or Fas/FasL expression were not tosis in human osteosarcoma cells through activation of BMP significantly changed (data not shown), indicating that statins receptor IB (BMPR-IB).18 Some statins are known to activate activated caspase-9 upstream of caspase-3 in these osteo- the BMP-2 promoter,19,20 resulting in increased Runx2 sarcoma cells. To confirm that statins activate caspases in expression and osteoprogenitor cell commitment to osteo- SaOS2 and OHS4 human osteosarcoma cells, the cells blasts.21 These studies raise the question of whether statins were pretreated for 1 h with z-Val-Ala-Asp-fluoromethylketone may promote apoptosis in osteosarcoma cells through (zVAD-fmk), a broad spectrum caspases inhibitor which induction of BMP-2. In this study, we provide evidence that blocks apoptotic cell death induction but not necrotic cell lipophilic statins induce caspase-dependent apoptosis in death. As shown in Figure 1d, zVAD-fmk completely human osteosarcoma cells independently of BMP-2 signaling prevented cell death induction by lipophilic statins. These and commitment to cell differentiation, by a mechanism results show that lipophilic statins decrease human osteo- specifically involving inactivation of RhoA and p42/p44 sarcoma cell viability by induction of caspase-dependent mitogen-activated protein kinases (MAPKs)-Bcl-2 survival apoptosis. pathway. Results Statin-induced osteosarcoma cell apoptosis occurs independently of BMP-2 and cell Lipophilic statins induce caspases-dependent differentiation apoptosis in human osteosarcoma cells Statins were previously found to activate the BMP-2 promoter We first investigated whether hydrophilic and lipophilic statins and thereby to promote osteoblast differentiation.19,20 As we may induce apoptosis in human osteosarcoma cells cultured previously showed that BMP-2 promotes human osteo- in growth supporting conditions (i.e. in the presence of 10% sarcoma cell apoptosis through BMPR-IB signaling,18 we serum). As shown in Figure 1a, treatment with lipophilic tested the hypothesis that statins may induce osteosarcoma statins (atorvastatin, cerivastatin, simvastatin) for 24 h de- cell apoptosis by increasing BMP-2 production. To this goal, creased cell viability in
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