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Therapeutic strategies to overcome cisplatin resistance in ovarian cancer. Eur J Med Chem 2022; 232:114205. [DOI: 10.1016/j.ejmech.2022.114205] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 02/12/2022] [Accepted: 02/14/2022] [Indexed: 12/15/2022]
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Materón EM, Shimizu FM, Figueiredo Dos Santos K, Nascimento GF, Geraldo VPN, Oliveira ON, Faria RC. Membrane model as key tool in the study of glutathione-s-transferase mediated anticancer drug resistance. Biomed Pharmacother 2021; 145:112426. [PMID: 34861633 DOI: 10.1016/j.biopha.2021.112426] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 11/05/2021] [Accepted: 11/12/2021] [Indexed: 11/02/2022] Open
Abstract
Glutathione-s-transferase is believed to be involved in the resistance to chemotherapeutic drugs, which depends on the interaction with the cell membranes. In this study, we employed Langmuir monolayers of a mixture of phospholipids and cholesterol (MIX) as models for tumor cell membranes and investigated their interaction with the anticancer drugs cisplatin (CDDP) and doxorubicin (DOX). We found that both DOX and CDDP expand and affect the elasticity of MIX monolayers, but these effects are hindered when glutathione-s-transferase (GST) and its cofactor glutathione (GSH) are incorporated. Changes are induced by DOX or CDDP on the polarization-modulated infrared reflection absorption spectroscopy (PM-IRRAS) data for MIX/GST/GSH monolayers, thus denoting some degree of interaction that is not sufficient to alter the monolayer mechanical properties. Overall, the results presented here give support to the hypothesis of the inactivation of DOX and CDDP by GST and point to possible directions to detect and fight drug resistance.
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Affiliation(s)
- Elsa M Materón
- Chemistry Department, Federal University of São Carlos, CP 676, São Carlos 13565-905, São Paulo, Brazil; São Carlos Institute of Physics, University of São Paulo, P.O Box 369, 13560-970 São Carlos, SP, Brazil.
| | - Flavio M Shimizu
- São Carlos Institute of Physics, University of São Paulo, P.O Box 369, 13560-970 São Carlos, SP, Brazil; Department of Applied Physics, "Gleb Wataghin" Institute of Physics (IFGW), University of Campinas (UNICAMP), Campinas, SP 13083-859, Brazil.
| | | | - Gustavo F Nascimento
- São Carlos Institute of Physics, University of São Paulo, P.O Box 369, 13560-970 São Carlos, SP, Brazil
| | - Vananélia P N Geraldo
- São Carlos Institute of Physics, University of São Paulo, P.O Box 369, 13560-970 São Carlos, SP, Brazil
| | - Osvaldo N Oliveira
- São Carlos Institute of Physics, University of São Paulo, P.O Box 369, 13560-970 São Carlos, SP, Brazil.
| | - Ronaldo C Faria
- Chemistry Department, Federal University of São Carlos, CP 676, São Carlos 13565-905, São Paulo, Brazil.
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Nunes SC, Serpa J. Glutathione in Ovarian Cancer: A Double-Edged Sword. Int J Mol Sci 2018; 19:ijms19071882. [PMID: 29949936 PMCID: PMC6073569 DOI: 10.3390/ijms19071882] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 06/15/2018] [Accepted: 06/25/2018] [Indexed: 01/21/2023] Open
Abstract
Glutathione (GSH) has several roles in a cell, such as a reactive oxygen species (ROS) scavenger, an intervenient in xenobiotics metabolism and a reservoir of cysteine. All of these activities are important in the maintenance of normal cells homeostasis but can also constitute an advantage for cancer cells, allowing disease progression and resistance to therapy. Ovarian cancer is the major cause of death from gynaecologic disease and the second most common gynaecologic malignancy worldwide. In over 50 years, the overall survival of patients diagnosed with epithelial ovarian cancer has not changed, regardless of the efforts concerning early detection, radical surgery and new therapeutic approaches. Late diagnosis and resistance to therapy are the main causes of this outcome, and GSH is profoundly associated with chemoresistance to platinum salts, which, together with taxane-based chemotherapy and surgery, are the main therapy strategies in ovarian cancer treatment. Herein, we present some insights into the role of GSH in the poor prognosis of ovarian cancer, and also point out how some strategies underlying the dependence of ovarian cancer cells on GSH can be further used to improve the effectiveness of therapy.
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Affiliation(s)
- Sofia C Nunes
- Centro de Estudos de Doenças Crónicas (CEDOC), NOVA Medical School/Faculdade de Ciências Médicas, Universidade Nova de Lisboa, Campo Mártires da Pátria 130, 1169-056 Lisboa, Portugal.
- Unidade de Investigação em Patobiologia Molecular do Instituto Português de Oncologia de Lisboa Francisco Gentil (IPOLFG), Rua Prof. Lima Basto, 1099-023 Lisboa, Portugal.
| | - Jacinta Serpa
- Centro de Estudos de Doenças Crónicas (CEDOC), NOVA Medical School/Faculdade de Ciências Médicas, Universidade Nova de Lisboa, Campo Mártires da Pátria 130, 1169-056 Lisboa, Portugal.
- Unidade de Investigação em Patobiologia Molecular do Instituto Português de Oncologia de Lisboa Francisco Gentil (IPOLFG), Rua Prof. Lima Basto, 1099-023 Lisboa, Portugal.
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Amable L. Cisplatin resistance and opportunities for precision medicine. Pharmacol Res 2016; 106:27-36. [PMID: 26804248 DOI: 10.1016/j.phrs.2016.01.001] [Citation(s) in RCA: 389] [Impact Index Per Article: 48.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Accepted: 01/01/2016] [Indexed: 01/11/2023]
Abstract
Cisplatin is one of the most commonly used chemotherapy drugs, treating a wide range of cancer types. Unfortunately, many cancers initially respond to platinum treatment but when the tumor returns, drug resistance frequently occurs. Resistance to cisplatin is attributed to three molecular mechanisms: increased DNA repair, altered cellular accumulation, and increased drug inactivation. The use of precision medicine to make informed decisions on a patient's cisplatin resistance status and predicting the tumor response would allow the clinician to tailor the chemotherapy program based on the biology of the disease. In this review, key biomarkers of each molecular mechanism will be discussed along with the current clinical research. Additionally, known polymorphisms for each biomarker will be discussed in relation to their influence on cisplatin resistance.
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Affiliation(s)
- Lauren Amable
- National Institute on Minority Health and Health Disparities, National Institutes of Health, 9000 Rockville Pike, Bethesda, MD 20892, United States.
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Caiola E, Broggini M, Marabese M. Genetic markers for prediction of treatment outcomes in ovarian cancer. THE PHARMACOGENOMICS JOURNAL 2014; 14:401-10. [DOI: 10.1038/tpj.2014.32] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Revised: 04/29/2014] [Accepted: 05/22/2014] [Indexed: 12/12/2022]
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MicroRNAs as therapeutic targets in chemoresistance. Drug Resist Updat 2013; 16:47-59. [PMID: 23757365 DOI: 10.1016/j.drup.2013.05.001] [Citation(s) in RCA: 116] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2012] [Accepted: 01/10/2013] [Indexed: 12/19/2022]
Abstract
Despite substantial progress in understanding the cancer signaling network, effective therapies remain scarce due to insufficient disruption of oncogenic pathways, drug resistance and drug-induced toxicity. New and more creative approaches are therefore required for the treatment of cancer. MicroRNAs (miRNAs) are a family of small noncoding RNAs that regulate gene expression by sequence-selective targeting of mRNAs, leading to a translational repression or mRNA degradation. Experimental evidence demonstrates that dysregulation of specific miRNAs leads to drug resistance in different cancers and correction of these miRNAs using miRNA mimics or antagomiRs can normalize the gene regulatory network and signaling pathways and sensitize cancerous cells to chemotherapy. Therefore, miRNA-based gene therapy provides an attractive anti-tumor approach for integrated cancer therapy. Here, we will discuss the involvement of microRNAs in chemotherapy resistance and focus on recent advancements in the development and delivery of miRNA-based cancer therapeutics.
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Brozovic A, Ambriović-Ristov A, Osmak M. The relationship between cisplatin-induced reactive oxygen species, glutathione, and BCL-2 and resistance to cisplatin. Crit Rev Toxicol 2010; 40:347-59. [PMID: 20163198 DOI: 10.3109/10408441003601836] [Citation(s) in RCA: 172] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Cisplatin (cDDP) is an anticancer agent that is widely used in the treatment of many solid tumors. A major obstacle to successful cDDP-based chemotherapy, however, is the intrinsic and acquired resistance of tumor cells to this drug. Greater insight into the molecular mechanisms underlying the modulation of cellular responses to cDDP will aid in the development and optimization of new therapeutic strategies. Apart from induction of DNA damage, recent data have suggested that cDDP also induces the formation of reactive oxygen species that can trigger cell death. Cell death occurs as the result of several simultaneously activated signaling pathways. The specific pathway responsible for cell death depends on the cell type and the treatment conditions. This review focuses on the relationship between glutathione and BCL-2 and their protective role in cDDP-induced reactive oxygen species formation and cDDP resistance.
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Affiliation(s)
- Anamaria Brozovic
- Laboratory for Genotoxic Agents, Division of Molecular Biology, Rudjer Boskovic Institute, Zagreb, Croatia.
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Unger FT, Klasen HA, Tchartchian G, de Wilde RL, Witte I. DNA damage induced by cis- and carboplatin as indicator for in vitro sensitivity of ovarian carcinoma cells. BMC Cancer 2009; 9:359. [PMID: 19818145 PMCID: PMC2768745 DOI: 10.1186/1471-2407-9-359] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2008] [Accepted: 10/10/2009] [Indexed: 12/03/2022] Open
Abstract
Background The DNA damage by platinum cytostatics is thought to be the main cause of their cytotoxicity. Therefore the measurement of the DNA damage induced by cis- and carboplatin should reflect the sensitivity of cancer cells toward the platinum chemotherapeutics. Methods DNA damage induced by cis- and carboplatin in primary cells of ovarian carcinomas was determined by the alkaline comet assay. In parallel, the reduction of cell viability was measured by the fluorescein diacetate (FDA) hydrolysis assay. Results While in the comet assay the isolated cells showed a high degree of DNA damage after a 24 h treatment, cell viability revealed no cytotoxicity after that incubation time. The individual sensitivities to DNA damage of 12 tumour biopsies differed up to a factor of about 3. DNA damage after a one day treatment with cis- or carboplatin correlated well with the cytotoxic effects after a 7 day treatment (r = 0,942 for cisplatin r = 0.971 for carboplatin). In contrast to the platinum compounds the correlation of DNA damage and cytotoxicity induced by adriamycin was low (r = 0,692), or did not exist for gemcitabine. Conclusion The measurement of DNA damage induced by cis- and carboplatin is an accurate method to determine the in vitro chemosensitivity of ovarian cancer cells towards these cytostatics, because of its quickness, sensitivity, and low cell number needed.
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Affiliation(s)
- Florian T Unger
- Institute for Biology and Environmental Sciences, Faculty V, University of Oldenburg, Oldenburg, Germany.
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Kolwijck E, Zusterzeel PL, Roelofs HM, Hendriks JC, Peters WH, Massuger LF. GSTP1-1 in Ovarian Cyst Fluid and Disease Outcome of Patients With Ovarian Cancer. Cancer Epidemiol Biomarkers Prev 2009; 18:2176-81. [DOI: 10.1158/1055-9965.epi-09-0098] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Mellor HR, Callaghan R. Resistance to chemotherapy in cancer: a complex and integrated cellular response. Pharmacology 2008; 81:275-300. [PMID: 18259091 DOI: 10.1159/000115967] [Citation(s) in RCA: 121] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2007] [Accepted: 09/10/2007] [Indexed: 12/30/2022]
Abstract
Inherent and acquired resistance pathways account for the high rate of failure in cancer chemotherapy. The mechanisms or pathways mediating resistance may be classified as pharmacokinetic (i.e. alter intratumour drug exposue) or pharmacodynamic (i.e. failure to elicit cytotoxicity). More often than not, the resistant phenotype is characterised by alterations in multiple pathways. Consequently, the pathways may act synergistically or generate a broad spectrum of resistance to anticancer drugs. There has been a great deal of systematic characterisation of drug resistance in vitro. However, translating this greater understanding into clinical efficacy has rarely been achieved. This review explores the phenomenon of drug resistance in cancer and highlights the gap between in vitro and in vivo observations. This gap presents a major obstacle in overcoming drug resistance and restoring sensitivity to chemotherapy.
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Affiliation(s)
- Howard R Mellor
- Growth Factor Group, Weatherall Institute of Molecular Medicine, Oxford, UK
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Nagle CM, Chenevix-Trench G, Spurdle AB, Webb PM. The role of glutathione-S-transferase polymorphisms in ovarian cancer survival. Eur J Cancer 2006; 43:283-90. [PMID: 17084623 DOI: 10.1016/j.ejca.2006.09.011] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2006] [Revised: 09/18/2006] [Accepted: 09/19/2006] [Indexed: 12/30/2022]
Abstract
Resistance to chemotherapy represents one of the most important causes of treatment failure in patients with ovarian cancer. Common polymorphisms in the glutathione-S-transferase (GSTM1, GSTP1 and GSTT1) family have been implicated in chemoresistence and ovarian cancer survival. In this study, we have analysed Australian women diagnosed with primary invasive epithelial ovarian cancer between 1985 and 1997, using DNA extracted from peripheral blood and archival uninvolved (normal) tissues. GSTP1 genotypes were determined using ABI Prism 7700 Sequence Detection System methodology (n=448) and GSTT1 and GSTM1 genotypes using PCR-agarose methodology (n=239). We observed a significant survival advantage among carriers of GSTP1 Ile105Val GG/GA genotype (HR 0.77, 95% confidence interval (CI) 0.61-0.99,p=0.04) and a non-significant survival advantage among women who were homozygous for the GSTM1 and GSTT1 deletion variants. There was also evidence of an additive effect, with a stronger survival benefit in women carrying three low function GST genotypes (GSTM1 null, GSTT1 null and GSTP1 GA/GG) (HR 0.47, 95% CI 0.22-1.02). The results of this study, the largest to date, are consistent with a number of previous smaller studies which have also observed that reduced GST function was associated with better survival outcomes in patients with ovarian cancer.
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Affiliation(s)
- Christina M Nagle
- Cancer and Population Studies Division, Queensland Institute of Medical Research, PO Royal Brisbane Hospital, Qld 4029, Australia
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Rabik CA, Dolan ME. Molecular mechanisms of resistance and toxicity associated with platinating agents. Cancer Treat Rev 2006; 33:9-23. [PMID: 17084534 PMCID: PMC1855222 DOI: 10.1016/j.ctrv.2006.09.006] [Citation(s) in RCA: 1164] [Impact Index Per Article: 64.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2006] [Revised: 09/06/2006] [Accepted: 09/11/2006] [Indexed: 12/17/2022]
Abstract
Platinating agents, including cisplatin, carboplatin, and oxaliplatin, have been used clinically for nearly 30years as part of the treatment of many types of cancers, including head and neck, testicular, ovarian, cervical, lung, colorectal and relapsed lymphoma. The cytotoxic lesion of platinating agents is thought to be the platinum intrastrand crosslink that forms on DNA, although treatment activates a number of signal transduction pathways. Treatment with these agents is characterized by resistance, both acquired and intrinsic. This resistance can be caused by a number of cellular adaptations, including reduced uptake, inactivation by glutathione and other anti-oxidants, and increased levels of DNA repair or DNA tolerance. Here we investigate the pathways that treatment with platinating agents activate, the mechanisms of resistance, potential candidate genes involved in the development of resistance, and associated clinical toxicities. Although the purpose of this review is to provide an overview of cisplatin, carboplatin, and oxaliplatin, we have focused primarily on preclinical data that has clinical relevance generated over the past five years.
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Affiliation(s)
- Cara A Rabik
- Department of Medicine, Committee on Clinical Pharmacology and Pharmacogenomics, University of Chicago, 5841 S. Maryland Avenue, Box MC2115, Section of Hem-Onc, Chicago, IL 60637, United States
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Beeghly A, Katsaros D, Chen H, Fracchioli S, Zhang Y, Massobrio M, Risch H, Jones B, Yu H. Glutathione S-transferase polymorphisms and ovarian cancer treatment and survival. Gynecol Oncol 2005; 100:330-7. [PMID: 16199080 DOI: 10.1016/j.ygyno.2005.08.035] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2005] [Revised: 08/25/2005] [Accepted: 08/26/2005] [Indexed: 11/28/2022]
Abstract
OBJECTIVE Members of the glutathione S-transferase (GST) family have been shown to have functional polymorphisms that may affect drug metabolism and influence the effects of chemotherapy and survival from cancer. GSTM1, GSTT1, and GSTP1 genotypes were evaluated for their role in ovarian cancer treatment and survival. METHODS DNA was extracted from tumor tissues of 215 patients diagnosed with primary epithelial ovarian cancer. GSTM1 and GSTT1 genotypes were determined by multiplex PCR; GSTP1 genotypes were assessed with PCR-RFLP. Associations between GST polymorphisms and risk of ovarian cancer progression or death were analyzed using Cox proportional hazards regression; subgroups of patients receiving different chemotherapeutics were also evaluated. RESULTS GST polymorphisms were not found to be associated with patient or tumor characteristics or response to treatment. However, GSTM1 null patients were less likely to have disease progression (HR: 0.65, 95% CI: 0.43-0.99) or to die (HR: 0.68, 95% CI: 0.45-1.03) compared to patients with GSTM1. Patients with GSTM1 null and GSTP1 ile/val or val/val (reduced function) had a further reduction in risk of disease progression compared to patients with GSTM1 or GSTP1 ile/ile (HR: 0.42, 95% CI: 0.24-0.75). A similar association was also suggested for overall survival (HR: 0.61, 95% CI: 0.36-1.05). Subgroup analyses indicated that the effects of GST on survival were more pronounced among patients treated with specific chemotherapeutics. CONCLUSION These findings support the idea that reduced GST function may improve ovarian cancer survival after post-operative chemotherapy; evaluation of GST functional polymorphisms may help to predict ovarian cancer prognosis.
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Affiliation(s)
- A Beeghly
- Department of Epidemiology and Public Health, Yale Cancer Center, Yale University School of Medicine, 60 College Street, New Haven, CT 06520-8034, USA
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Surowiak P, Materna V, Kaplenko I, Spaczyński M, Dietel M, Lage H, Zabel M. Augmented expression of metallothionein and glutathione S-transferase pi as unfavourable prognostic factors in cisplatin-treated ovarian cancer patients. Virchows Arch 2005; 447:626-33. [PMID: 15968547 DOI: 10.1007/s00428-005-1228-0] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2004] [Accepted: 02/09/2005] [Indexed: 11/25/2022]
Abstract
Resistance to cis- or carboplatin represents the principal cause of therapeutic failures in ovarian carcinoma. The phenomenon of resistance to platinum-based drugs is partly related to expression of metallothionein (MT) and of glutathione S-transferase pi (GST-pi), but opinion on the subject is discordant. Documentation of a negative predictive effect of MT and GST-pi expression for the therapy employing platinum-based drugs would permit to select resistant cases in which other therapeutic approaches could be employed. The present study aimed at examining the relation between intensities of MT and GST-pi expressions in ovarian carcinomas and dynamics of the clinical course in the neoplastic disease in a group of cisplatin-treated patients. The analyses were performed on samples of ovarian carcinoma originating from 43 first-look laparotomies (FLLs) and, in 30 cases, from second-look laparotomies (SLL) from the same patients. Immunohistochemical reactions were performed on paraffin sections of studied tumors, using monoclonal antibodies to MT and GST-pi. The calculations showed that in cases with augmented expression of MT, mortality was higher. On the other hand, augmented expression of GST-pi predisposed to more frequent relapses, deaths and progression of the tumor. Kaplan-Meier analysis showed that a significantly shorter survival time was linked to cases of higher expression of MT at FLL and of higher expression of GST-pi at FLL, whereas a shorter progression-free time was manifested by cases with higher expression of GST-pi at FLL. The performed investigations indicate that augmented expressions of MT at FLL and GST-pi at FLL in ovarian cancer represent an unfavourable predictive factor in cisplatin-treated patients.
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Affiliation(s)
- Paweł Surowiak
- Department of Histology and Embryology, University School of Medicine, ul. Chałubińskiego 6a, 50-356 Wrocław, Poland
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Akçay T, Dinçer Y, Alademir Z, Aydinli K, Arvas M, Demirkiran F, Kösebay D. Significance of the O6-methylguanine-DNA methyltransferase and glutathione S-transferase activity in the sera of patients with malignant and benign ovarian tumors. Eur J Obstet Gynecol Reprod Biol 2005; 119:108-13. [PMID: 15734094 DOI: 10.1016/j.ejogrb.2004.06.037] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2003] [Revised: 12/05/2003] [Accepted: 06/17/2004] [Indexed: 10/26/2022]
Abstract
OBJECTIVE To demonstrate O6-methylguanine-DNA methyltransferase (MGMT) and glutathione S-transferase (GST) activities by analyzing the sera separately obtained from patients with malignant ovarian tumors, benign ovarian tumors, and healthy individuals. STUDY DESIGN Fourty-nine patients with ovarian cancer, nine patients with benign tumors, and 22 healthy women were included in this study. Blood samples were obtained from all the subjects in the malignant-tumor, benign-tumor, and control groups. Patients with malignant tumors underwent second and third phlebotomies one week following the surgery and after the chemotherapy regimen, respectively. MGMT, GST, and protein levels were measured for each serum sample. GST activity of the samples was measured by the method of Habig et al. using l-chloro-2-4 dinitrobenzene (CDNB) as substrate. MGMT activity was measured by the transfer of radio labelled methyl groups from a prepared MG-DNA substrate to the enzyme fraction of serum. Protein concentration was measured by biuret method. RESULTS Our work demonstrated that untreated patients with malignant ovarian tumors revealed significantly greater MGMT and GST activities in their sera than did both healthy individuals and patients with benign ovarian tumors, while no significant difference was found between the healthy group and the patients with benign ovarian tumors with respect to their sera MGMT and GST activities. GST activity following chemotherapy was significantly lower than the postoperative values preceding chemotherapy. A relationship between sera MGMT and GST activities, tumor histology and pathology was not found in this study. CONCLUSION Our work suggests the fact that detection of sera MGMT and GST activities is important in diagnostic and therapeutic approaches during the course of ovarian cancer.
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Affiliation(s)
- Tülay Akçay
- Division of Biochemistry, Cerrahpaşa Medical Faculty, Istanbul University, 34300 Istanbul, Turkey.
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van Laar ES, Izbicka E, Weitman S, Medina-Gundrum L, Macdonald JR, Waters SJ. Antitumor activity of irofulven against human ovarian cancer cell lines, human tumor colony-forming units, and xenografts. Int J Gynecol Cancer 2004; 14:824-31. [PMID: 15361190 DOI: 10.1111/j.1048-891x.2004.014515.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
The objective of this study was to investigate the cytotoxic activity of irofulven (HMAF, MGI 114), a unique chemotherapeutic agent currently under clinical investigation, in various preclinical models of ovarian cancer. Antiproliferative effects of irofulven in ovarian cancer cell lines and ovarian tumor specimens were characterized in vitro using sulforhodamine B and human tumor colony-forming assays, respectively. Irofulven demonstrated marked activity against a panel of ovarian tumor cell lines, including IGROV1, OVCAR-3, OVCAR-4, OVCAR-5, OVCAR-8, and SK-OV-3, all of which exhibit various drug resistance mechanisms. In human tumor cloning assays, irofulven inhibited colony formation in surgically derived ovarian tumors at concentrations as low as 0.001 micro g /ml and indicated superior activity in comparison with paclitaxel when tested against the same tumor specimens. The antitumor activity of irofulven compared to that of paclitaxel was also examined using the SK-OV-3 xenograft model. In mice bearing subcutaneously implanted SK-OV-3 tumors, treatment with paclitaxel failed to inhibit tumor growth; whereas mice treated with maximum tolerated doses of irofulven had a 25% partial shrinkage rate, and the remaining animals had a mean tumor growth inhibition of 82%. The potent activity of irofulven against ovarian tumors in vitro and in vivo supports the evaluation of its clinical activity in ovarian cancer.
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Ishimoto TM, Ali-Osman F. Allelic variants of the human glutathione S-transferase P1 gene confer differential cytoprotection against anticancer agents in Escherichia coli. PHARMACOGENETICS 2002; 12:543-53. [PMID: 12360105 DOI: 10.1097/00008571-200210000-00006] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The polymorphic human GSTP1 gene locus encodes proteins that differentially metabolize electrophilic substrates, including, many chemotherapeutic agents used in clinical cancer therapy. In this study, we used XL1-Blue MRF strain, transformed with phagemid expression vectors carrying cDNAs of three GSTP1 alleles, to investigate the cytoprotective abilities of the different GSTP1 alleles against four clinically active anticancer agents, namely, carboplatin, cisplatin, thiotepa, and 4-hydroperoxyifosfamide. Following induction of protein expression with isopropyl-beta-d-thiogalactoside, the cells were treated with each drug for 3 h (1 h for 4-hydroperoxyifosfamide). Surviving fractions were determined and used to compute a cytoprotective factor for each allele against each drug. The results showed all the GSTP1 alleles to be cytoprotective, albeit, to different degrees. For cisplatin and carboplatin, the allele was most protective, with CPs of 5.58 and 3.76, respectively, compared with 1.21 and 1.61 for and 2.50 and 2.79 for. In contrast, protection against thiotepa was highest for the allele, with a cytoprotective factor of 1.56, compared to 1.32 for and 1.1 for. For 4-hydroperoxyifosfamide, the CP for and was the same, 1.45, compared with 1.18 for. These data demonstrate significant differences in the ability of the different GSTP1 alleles to protect against the cytotoxicity of electrophilic anticancer agents. The level of protection differs significantly between different GSTP1 alleles, and between different anticancer agents. The optimized prokaryotic system described provides a useful and rapid tool for pharmacogenetic analysis of the effects of genes on drug sensitivity.
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Affiliation(s)
- Tricia M Ishimoto
- Section of Molecular Therapeutics, Department of Neurosurgery, The University of Texas, MS Anderson Cancer Center, Houston, TX 77030, USA
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