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Inhibition of Glutathione-S-Transferase As a Treatment Strategy for Multidrug Resistance in Childhood Rhabdomyosarcoma

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Inhibition of Glutathione-S-Transferase As a Treatment Strategy for Multidrug Resistance in Childhood Rhabdomyosarcoma 491-500.qxd 16/12/2009 02:21 ÌÌ Page 491 INTERNATIONAL JOURNAL OF ONCOLOGY 36: 491-500, 2010 491 Inhibition of glutathione-S-transferase as a treatment strategy for multidrug resistance in childhood rhabdomyosarcoma GUIDO SEITZ1*, MICHAEL BONIN2*, JÖRG FUCHS1, SVEN POTHS2, PETER RUCK3, STEVEN W. WARMANN1 and SORIN ARMEANU-EBINGER1 1Department of Pediatric Surgery, University Children's Hospital, Hoppe-Seyler-Strasse 3, 72076 Tübingen; 2Institute of Anthropology and Human Genetics, Microarray Facility, University Hospital, Calwer Strasse 7, 72076 Tübingen; 3Institute of Pathology, Rutesheimer Strasse 50/1, 71229 Leonberg, Germany Received July 20, 2009; Accepted September 8, 2009 DOI: 10.3892/ijo_00000523 Abstract. Multidrug resistance (MDR) is a common problem in part. The GST family represents a promising target for in the treatment of childhood rhabdomyosarcoma (RMS). A further treatment strategies in childhood RMS. complete reversal of MDR is currently not possible. The aim of this study was to investigate the role of glutathione-S- Introduction transferase (GST) as mechanism of MDR in childhood RMS and to analyze possible reversal strategies. Female athymic Rhabdomyosarcoma (RMS) is the most common pediatric mice underwent xenotransplantation with embryonal or soft tissue sarcoma. About two-thirds of all sarcomas and alveolar RMS cells and were treated with vincristine. Gene 7-8% of all solid malignant tumors in childhood are RMS expression analysis using Affymetrix HU-Gene 1.0 arrays (1). The two main histological subtypes are embryonal revealed 2314 differentially expressed genes between the (eRMS) and alveolar (aRMS) RMS (2). The prognosis of the groups in alveolar RMS and 1387 in embryonal RMS. patients depends on the primary tumor localization (2,3), Ingenuity pathway analysis revealed a cluster of 5 over- histological subtype (4), stage of disease (5) and the age at expressed genes of the GST family in animals treated with diagnosis (2). vincristine, putative mediating the development of MDR. In Treatment of childhood RMS is mostly performed within order to analyze possible GST activity after chemotherapy clinical trials such as the Cooperative Soft Tissue Sarcoma with other commonly used drugs (doxorubicin, topotecan), Study (CWS 2002-P (6)), SIOP's (International Society of cell culture experiments with alveolar and embryonal RMS Pediatric Oncology) MTT (Malignant Mesenchymal tumors) cells were carried out. Specific GST activity was quantified trial (7), trials of the Children's Oncology Group (COG 8), or using the clorodinitrobenzol conjugation with glutathione. the Italian Soft Tissue Sarcoma Cooperative Group (9). Increased GST activity was found after incubation with Besides local tumor control with radiotherapy and/or surgery, cytotoxic agents in all cell lines. Highest induction of GST systemic therapy with cytotoxic agents is important for a activity was found in embryonal RMS (up to 12-fold). After sufficient therapy of these patients. The most commonly used incubation with the GST inhibitors, tumor cell viability was cytotoxic agents include vinca-alkaloids, actinomycin D, decreased depending on the type of tumor cell and inhibitor alkylating agents and antracyclines (6-9). used. We detected a novel mechanism for MDR in childhood One major treatment problem, besides local tumor recur- RMS mediated via genes and proteins of the GST family. rence and development of metastases, is the development of Reversal of these effects may be achieved by GST inhibitors multidrug resistance (MDR), which leads to insufficient response, especially in patients with advanced or relapsed tumors. Various resistance-associated genes and proteins _________________________________________ have been identified in RMS (10). We have previously demonstrated that MDR mechanisms in RMS depend on the Correspondence to: Dr Guido Seitz, Department of Pediatric histological subtype. We found that MDR is mediated via a Surgery, University Children's Hospital, Hoppe-Seyler-Strasse 1, P-glycoprotein-dependent mechanism in aRMS in vitro and 72076 Tübingen, Germany in vivo. In eRMS, mechanisms like multidrug resistance- E-mail: [email protected] associated protein (MRP) or lung resistance-related protein (LRP) seems to play a role for multidrug resistance in vitro. *Contributed equally In vivo, these xenobiotic pumps were of less importance (10). Therefore, MDR in childhood RMS is not completely Key words: glutathione-S-transferase, rhabdomyosarcoma, understood and other mechanisms may also play a role in multidrug resistance these patients. Detoxification is another common mechanism for MDR. Gluthatione-S-transferases (GST) belongs to a family of 491-500.qxd 16/12/2009 02:21 ÌÌ Page 492 492 SEITZ et al: INHIBITION OF GST-MEDIATED MDR IN RHABDOMYOSARCOMA Phase II detoxification enzymes that catalyze the conjugation histological analysis. Tissue processing was continued in a of glutathione (GSH) to a variety of endogenous and exoge- vacuum tissue processor (Leica TP 1050, Leica Wiesloch, nous electrophilic components (11). GSTs have been suspected Germany). Tissue was paraffin-embedded after processing. to play a role in the development of drug resistance against Sections (5 μm) were made and tissue was deparaffinized cytotoxic agents (11). GSTs might mediate the development with xylole and ethanol. Staining with hematoxylin and eosin of MDR via direct detoxification and as an inhibitor of the was carried out for evaluation of histological changes, mitotic MAP kinase pathway. Up-regulation of GSTs has been changes and necrosis rate at 10 high power fields (x400). reported in several cancer types (12) including melanoma cells which were resistant to vincristine (13). Moreover, a RNA extraction and linear amplification. Tumor specimens reversal of these effects was also seen after the usage of GST were immediately fixed in liquid nitrogen and stored at -80˚C inhibitors like dicumarol or curcumin (13). Therefore, a for further gene chip analysis. Therefore, total RNA extraction broad range of GST inhibitors were developed to modulate was carried out using RNeasy Kit (Qiagen, Hilden, Germany). drug resistance and to sensitize tumor cells to cytotoxic drugs The quality of total RNA of tumors was monitored by Agilent (11,14). The role of GSTs for MDR in childhood rhabdo- 2100 Bioanalyzer using the RNA 6000 Nano LabChip Kit myosarcoma has not been analyzed yet. (Agilent Technologies, Böblingen, Germany) as specified by The aim of this study was to evaluate the possible role of the manufacturer. GST as mediator for MDR in childhood rhabdomyosarcoma. Additionally, a possible reversal of GST by GST inhibitors is Oligonucleotide microarrays and acquisition of data. For discussed. gene chip analysis, tumor specimens from 3 animals of each group were randomly selected. Affymetrix high-density Material and methods oligonucleotide microarrays (GeneChip HU Gene 1.0, Affy- metrix, Santa Clara, CA, USA) were used for gene expression Animals and xenotransplantation. Female athymic (nu/nu) analysis. Hybridization experiments and evaluation was done NMRI mice, aged 6-8 weeks, weighing 20-25 g, were used in by the Microarray Facility Tübingen. Arrays were scanned all experiments (n=3 per group). The animals were obtained using the GCS3000 Gene Chip scanner (Affymetrix) and from our own facility. The animals were kept under pathogen GCOS 1.4 software. Scanned images were subjected to free conditions, fed an autoclaved standard diet and given visual inspection to control for hybridization artifacts and free access to sterilized water. All animal studies were carried proper grid alignment and analyzed with Expression Console out under principles of laboratory animal care and were 1.0 (Affymetrix) to generate report files for quality control. approved by the local government ethics committee for For statistical data analysis the CEL-files from the HG-U133 animal studies (Tübingen, Germany, CK01/03). 2.0+ arrays were imported into Genespring 7.3 (Agilent The eRMS cell line A204 (ATCC, Manassas, VA, USA) Technologies) using Genespring's implementation of GC- and the aRMS cell line Rh30 (DSMZ, Braunschweig, RMA for normalization and probe summarization (15). Germany) were used for the experiments and were cultured Genes that showed an at least two-fold increase or decrease in DMEM medium supplemented with 10% fetal calf serum, in average expression were analyzed in a Welsh's t-test for 4.5% L-Glu and 2.5% HEPES in a humified atmosphere significant differences and corrected for multiple testing containing 5% CO2 at 37˚C. All cell cultures were mycoplasma according to Benjamini and Hochberg (16). In the samples species negative. Tumor cells were trypsinized and resus- the mRNA of a gene was considered expressed (‘present’) pended in RPMI-1640 medium (Gibco, Berlin, Germany). when the detection p-value and change p-value were <0.05. Approximately 106 tumor cells (2 ml) were injected subcu- The same was valid for Rh30 and A204 tumors changed in taneously in the right flank of nude mice (NMRI nu/nu). expression during treatment with vincristine. To determine Cells from both cell lines were xenotransplanted into 3 mice the p-values, a signed rank analysis was carried out on the each. The first group of xenotransplantated animals was PM (present match) and MM (mismatch) differences not treated with cytotoxic drugs and served as a control comparing each probe pair. The resulting p-values were used group. The second group of animals was treated with the to make
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