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Carrett-Dias M, Almeida LK, Pereira JL, Almeida DV, Filgueira DMVB, Marins LF, Votto APDS, Trindade GS. Cell differentiation and the multiple drug resistance phenotype in human erythroleukemic cells. Leuk Res 2016; 42:13-20. [DOI: 10.1016/j.leukres.2016.01.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Revised: 01/14/2016] [Accepted: 01/18/2016] [Indexed: 12/16/2022]
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2
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Kuete V, Tankeo SB, Saeed MEM, Wiench B, Tane P, Efferth T. Cytotoxicity and modes of action of five Cameroonian medicinal plants against multi-factorial drug resistance of tumor cells. JOURNAL OF ETHNOPHARMACOLOGY 2014; 153:207-219. [PMID: 24583070 DOI: 10.1016/j.jep.2014.02.025] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Revised: 01/24/2014] [Accepted: 02/12/2014] [Indexed: 06/03/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Beilschmiedia acuta Kosterm, Clausena anisata (Willd) Hook, Fagara tessmannii Engl., Newbouldia laevis Seem., and Polyscias fulva (Hiern) Harms. are medicinal plants used in Cameroonian traditional medicine in the treatment of various types of cancers. The present study aims at investigating 11 methanolic extracts from the above Cameroonian medicinal plants on a panel of human cancer cell lines, including various drug-resistant phenotypes. Possible modes of action were analyzed for two extracts from Beilschmiedia acuta and Polyscia fulva and alpha-hederin, the representative constituent of Polyscia fulva. MATERIALS AND METHODS Cytotoxicity was determined using a resazurin assay. Cell cycle, apoptosis, mitochondrial membrane potential (MMP), and reactive oxygen species (ROS) were measured by flow cytometry. Cellular response to alpha-hederin was investigated by a mRNA microarray approach. RESULTS Prescreening of extracts (40µg/mL) showed that three of eleven plant extracts inhibited proliferation of CCRF-CEM cells by more than 50%, i.e. BAL (73.65%), the bark extract of Beilschmiedia acuta (78.67%) and PFR (68.72%). Subsequent investigations revealed IC50 values below or around 30µg/mL of BAL and PFR in 10 cell lines, including drug-resistant models, i.e. P-glycoprotein-overexpressing CEM/ADR5000, breast cancer resistance protein-transfected MDA-MB-231-BCRP, TP53 knockout cells (HCT116 p53(-/-)), and mutation-activated epidermal growth factor receptor-transfected U87MG.ΔEGFR cells. IC50 values below 5µg/mL of BAL were obtained for HCT116 (p53(-/-)) cells. IC50 values below 10µM of alpha-hederin were found for sensitive CCRF-CEM and multidrug-resistant CEM/ADR5000 cells. The BAL and PFR extracts induced cell cycle arrest between G0/G1 and S phases. PFR-induced apoptosis was associated with increased ROS generation and MMP breakdown. Microarray-based cluster analysis revealed a gene expression profile that predicted cellular response to alpha-hederin. CONCLUSION BAL, PFL and alpha-hederin, an exemplarily taken constituent of Beilschmiedia acuta and Polyscia fulva extracts revealed cytotoxicity towards cancer cell lines. Hence, Beilschmiedia acuta and Polyscia fulva may be valuable to develop drugs against otherwise drug-resistant cancer cells.
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Affiliation(s)
- Victor Kuete
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, University of Mainz, Staudinger Weg 5, 55128 Mainz, Germany; Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Simplice B Tankeo
- Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Mohamed E M Saeed
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, University of Mainz, Staudinger Weg 5, 55128 Mainz, Germany
| | - Benjamin Wiench
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, University of Mainz, Staudinger Weg 5, 55128 Mainz, Germany
| | - Pierre Tane
- Department of Organic Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Thomas Efferth
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, University of Mainz, Staudinger Weg 5, 55128 Mainz, Germany.
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3
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Kim I, Koh Y, Yoon SS, Park S, Kim BK, Kim DY, Lee JH, Lee KH, Cheong JW, Lee HK, Kim SH, Kim H, Joo YD, Lee SM, Won JH, Park SK, Hong DS, Kim SH, Sohn SK, Kim CS, Park E, Kim MK, Park MR, Lee JH, Min YH. Fludarabine, cytarabine, and attenuated-dose idarubicin (m-FLAI) combination therapy for elderly acute myeloid leukemia patients. Am J Hematol 2013; 88:10-5. [PMID: 23077109 DOI: 10.1002/ajh.23337] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2011] [Revised: 08/29/2012] [Accepted: 08/30/2012] [Indexed: 12/11/2022]
Abstract
We performed a phase II trial to evaluate the efficacy and safety of the modified fludarabine, cytarabine, and attenuated-dose idarubicin (m-FLAI) regimen in elderly acute myeloid leukemia (AML) patients. Elderly (≥60 years) AML patients who had not previously received chemotherapy were enrolled in the study. Patients received two consecutive cycles of m-FLAI chemotherapy as an induction. The m-FLAI regimen comprised fludarabine (25 mg/m(2) , days 1-4), cytarabine (1,000 mg/m(2) , days 1-4), and attenuated-dose idarubicin (5 mg/m(2) , days 1-3). The primary end point was complete remission (CR) rate. Secondary end points were overall survival (OS), event-free survival (EFS), and treatment-related mortality (TRM). There were 108 patients (median age 68.4 years, M:F = 64:44) enrolled in the study. CR was achieved in 56.5% of patients, and the TRM rate was 21.3%. Median OS and median EFS were 10.2 and 6.6 months, respectively. The mortality at 30 and 60 days was 15 and 21%, respectively. Performance status and comorbidity did not have prognostic value in this patient cohort. Bone marrow expression of CD117 was associated with increased EFS and OS. m-FLAI is an effective induction regimen for previously untreated AML in elderly patients. In addition, bone-marrow CD117 expression is an independent favorable prognostic factor in elderly AML patients. (ClinicalTrials.gov number, NCT01247493).
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Affiliation(s)
- Inho Kim
- Department of Internal Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Korea
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4
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Jouan E, Le Vee M, Denizot C, Da Violante G, Fardel O. The mitochondrial fluorescent dye rhodamine 123 is a high-affinity substrate for organic cation transporters (OCTs) 1 and 2. Fundam Clin Pharmacol 2012; 28:65-77. [DOI: 10.1111/j.1472-8206.2012.01071.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2012] [Revised: 07/11/2012] [Accepted: 07/19/2012] [Indexed: 01/10/2023]
Affiliation(s)
- Elodie Jouan
- Institut de Recherches en Santé, Environnement et Travail (IRSET), UMR INSERM U1085, Faculté de Pharmacie; 2 Avenue du Pr Léon Bernard 35043 Rennes France
| | - Marc Le Vee
- Institut de Recherches en Santé, Environnement et Travail (IRSET), UMR INSERM U1085, Faculté de Pharmacie; 2 Avenue du Pr Léon Bernard 35043 Rennes France
| | - Claire Denizot
- Technologie Servier; 25-27 rue Eugène Vignat 45000 Orléans France
| | | | - Olivier Fardel
- Institut de Recherches en Santé, Environnement et Travail (IRSET), UMR INSERM U1085, Faculté de Pharmacie; 2 Avenue du Pr Léon Bernard 35043 Rennes France
- Pôle Biologie; Centre Hospitalier Universitaire; 2 rue Henri Le Guilloux 35033 Rennes France
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5
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Radujkovic A, Schad M, Topaly J, Veldwijk MR, Laufs S, Schultheis BS, Jauch A, Melo JV, Fruehauf S, Zeller WJ. Synergistic activity of imatinib and 17-AAG in imatinib-resistant CML cells overexpressing BCR-ABL – Inhibition of P-glycoprotein function by 17-AAG. Leukemia 2005; 19:1198-206. [PMID: 15902298 DOI: 10.1038/sj.leu.2403764] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Overexpression of BCR-ABL and P-glycoprotein (Pgp) are two of the known mechanisms of imatinib resistance. As combination therapy may allow to overcome drug resistance, we investigated the effect of combination treatment with imatinib and 17-allylamino-17-demethoxygeldanamycin (17-AAG), a heat-shock protein 90 (Hsp90) inhibitor, on different imatinib-sensitive and imatinib-resistant CML cell lines. In imatinib-sensitive cells, combination index (CI) values obtained using the method of Chou and Talalay indicated additive (CI=1) or marginally antagonistic (CI>1) effects following simultaneous treatment with imatinib and 17-AAG. In imatinib-resistant cells both drugs acted synergistically (CI<1). In primary chronic-phase CML cells additive or synergistic effects of the combination of imatinib plus 17-AAG were discernible. Annexin V/propidium iodide staining showed that the activity of imatinib plus 17-AAG is mediated by apoptosis. Combination treatment with imatinib plus 17-AAG was more effective in reducing the BCR-ABL protein level than 17-AAG alone. Monotherapy with 17-AAG decreased P-glycoprotein activity, which may increase intracellular imatinib levels and contribute to the sensitization of CML cells to imatinib. The results suggest that combination of imatinib and 17-AAG may be useful to overcome imatinib resistance in a clinical setting.
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MESH Headings
- ATP Binding Cassette Transporter, Subfamily B, Member 1/drug effects
- ATP Binding Cassette Transporter, Subfamily B, Member 1/physiology
- Antineoplastic Combined Chemotherapy Protocols/pharmacology
- Apoptosis/drug effects
- Benzamides
- Benzoquinones
- Cell Proliferation/drug effects
- Drug Synergism
- Fusion Proteins, bcr-abl/biosynthesis
- Fusion Proteins, bcr-abl/genetics
- Gene Expression Regulation, Leukemic/drug effects
- Humans
- Imatinib Mesylate
- In Situ Hybridization, Fluorescence
- Lactams, Macrocyclic
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/drug therapy
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/genetics
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/pathology
- Phosphorylation
- Piperazines/pharmacology
- Protein-Tyrosine Kinases/analysis
- Protein-Tyrosine Kinases/biosynthesis
- Pyrimidines/pharmacology
- RNA, Messenger/genetics
- Rifabutin/analogs & derivatives
- Rifabutin/pharmacology
- Tumor Stem Cell Assay
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Affiliation(s)
- A Radujkovic
- Research Program Innovative Cancer Diagnostics and Therapy, German Cancer Research Center (DKFZ), Heidelberg, Germany
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Matsui H, Takeshita A, Naito K, Shinjo K, Shigeno K, Maekawa M, Yamakawa Y, Tanimoto M, Kobayashi M, Ohnishi K, Ohno R. Reduced effect of gemtuzumab ozogamicin (CMA-676) on P-glycoprotein and/or CD34-positive leukemia cells and its restoration by multidrug resistance modifiers. Leukemia 2002; 16:813-9. [PMID: 11986941 DOI: 10.1038/sj.leu.2402459] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2001] [Accepted: 01/03/2002] [Indexed: 11/09/2022]
Abstract
Gemtuzumab ozogamicin (CMA-676), a calicheamicin-conjugated humanized anti-CD33 mouse monoclonal antibody, has recently been introduced clinically as a promising drug for the treatment of patients with acute myeloid leukemia (AML), more than 90% of which express CD33 antigen. However, our recent study suggested that CMA-676 was excreted by a multi- drug-resistance (MDR) mechanism in P-glycoprotein (P-gp)-expressing leukemia cell lines. We analyzed the in vitro effects of CMA-676 on leukemia cells from 27 AML patients in relation to the amount of P-gp, MDR-associated protein 1 (MRP1), CD33 and CD34, using a multi-laser-equipped flow cytometer. The cytocidal effect of CMA-676, estimated by the amount of hypodiploid portion on cell cycle, was inversely related to the amount of P-gp estimated by MRK16 monoclonal antibody (P = 0.004), and to the P-gp function assessed by intracellular rhodamine-123 accumulation in the presence of PSC833 or MS209 as a MDR modifier (P = 0.0004 and P = 0.002, respectively). In addition, these MDR modifiers reversed CMA-676 resistance in P-gp-expressing CD33(+) leukemia cells (P = 0.001 with PSC833 and P = 0.0007 with MS209). In CD33(+) AML cells from 13 patients, CMA-676 was less effective on CD33(+)CD34(+) than CD33(+)CD34(-) cells (P = 0.002). PSC833 partially restored the effect of CMA-676 in CD33(+)CD34(+) cells. These results suggest that the combined use of CMA-676 and a MDR modifier will be more effective on CD33(+) AML with P-gp-related MDR.
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MESH Headings
- ATP Binding Cassette Transporter, Subfamily B, Member 1/analysis
- Acute Disease
- Adult
- Aged
- Aged, 80 and over
- Aminoglycosides
- Anti-Bacterial Agents/pharmacology
- Antibodies, Monoclonal/pharmacology
- Antibodies, Monoclonal, Humanized
- Antigens, CD/analysis
- Antigens, CD/immunology
- Antigens, CD34/analysis
- Antigens, Differentiation, Myelomonocytic/analysis
- Antigens, Differentiation, Myelomonocytic/immunology
- Cell Cycle/drug effects
- Cyclosporins/pharmacology
- Drug Interactions
- Drug Resistance, Neoplasm
- Female
- Gemtuzumab
- Humans
- Immunotoxins/pharmacology
- Leukemia, Myeloid/immunology
- Leukemia, Myeloid/metabolism
- Leukemia, Myeloid/pathology
- Male
- Middle Aged
- Quinolines/pharmacology
- Sialic Acid Binding Ig-like Lectin 3
- Tumor Cells, Cultured
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Affiliation(s)
- H Matsui
- Division of Hematology, Department of Medicine III, Hamamatsu University School of Medicine, 1-20-1 Handa-yama, Hamamatsu-shi, 431-3192 Japan
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7
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Tsimberidou AM, Paterakis G, Androutsos G, Anagnostopoulos N, Galanopoulos A, Kalmantis T, Meletis J, Rombos Y, Sagriotis A, Symeonidis A, Tiniakou M, Zoumbos N, Yataganas X. Evaluation of the clinical relevance of the expression and function of P-glycoprotein, multidrug resistance protein and lung resistance protein in patients with primary acute myelogenous leukemia. Leuk Res 2002; 26:143-54. [PMID: 11755464 DOI: 10.1016/s0145-2126(01)00106-0] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The multidrug resistance (MDR) transporter-proteins P-glycoprotein (Pgp), multidrug resistance protein (MRP) and lung resistance protein (LRP) have been associated with treatment failure. The aim of this study was to investigate prospectively the clinical significance of expression and function of the MDR proteins, considering other prognostic factors, such as age, immunophenotype, and cytogenetics. Mononuclear cells of peripheral blood or bone marrow from 61 patients with de novo acute myelogenous leukemia (AML) were analyzed. The monoclonal antibodies JSB1, MRPm6 and LRP56 were used for expression studies. Accumulation and retention studies were performed using the substrates Daunorubicin, Calcein-AM, Rhodamine-123 and DiOC(2) in the presence or absence of the modifiers Verapamil, Genistein, Probenecid, BIBW22S and PSC833. Induction treatment consisted of a 3+7 combination of Ida/Ara-C for patients < or = 60 years of age and a 3+5 Ida/VP-16 combination per OS for patients >60. MDR function was expressed as the ratio of mean fluorescence intensity substrate in the presence of modifier over the substrate alone (resistance index, RI). Patients with advanced age, low CD15 expression and high RI for accumulation of DiOC(2) in the presence of BIBW22S had significantly lower complete remission (CR) rates. No factor was prognostic for event-free survival analysis, which was limited to remitters only. Overall survival was shorter in patients with advanced age, poor prognosis cytogenetics, high CD7 expression, and high RI for Daunorubicin efflux modulated by Verapamil. These results suggest that MDR transporter-proteins have a limited role in the treatment failure of patients treated with Idarubicin-based regimens.
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MESH Headings
- ATP Binding Cassette Transporter, Subfamily B, Member 1/biosynthesis
- ATP Binding Cassette Transporter, Subfamily B, Member 1/genetics
- ATP Binding Cassette Transporter, Subfamily B, Member 1/physiology
- Acute Disease
- Adolescent
- Adult
- Age Factors
- Aged
- Antineoplastic Combined Chemotherapy Protocols/therapeutic use
- Bone Marrow Transplantation
- Calcium Channel Blockers/pharmacology
- Carbocyanines/metabolism
- Combined Modality Therapy
- Cytarabine/administration & dosage
- Daunorubicin/metabolism
- Disease-Free Survival
- Drug Resistance, Multiple/genetics
- Drug Resistance, Neoplasm/genetics
- Enzyme Inhibitors/pharmacology
- Female
- Fluoresceins/metabolism
- Fluorescent Dyes/metabolism
- Genistein/pharmacology
- Humans
- Idarubicin/administration & dosage
- Immunophenotyping
- Leukemia, Myeloid/drug therapy
- Leukemia, Myeloid/genetics
- Leukemia, Myeloid/metabolism
- Leukemia, Myeloid/mortality
- Leukemia, Myeloid/therapy
- Male
- Middle Aged
- Multidrug Resistance-Associated Proteins/biosynthesis
- Multidrug Resistance-Associated Proteins/genetics
- Multidrug Resistance-Associated Proteins/physiology
- Neoplasm Proteins/biosynthesis
- Neoplasm Proteins/genetics
- Neoplasm Proteins/physiology
- Probenecid/pharmacology
- Prognosis
- Prospective Studies
- Rhodamine 123/metabolism
- Survival Analysis
- Tumor Cells, Cultured/metabolism
- Vault Ribonucleoprotein Particles/biosynthesis
- Vault Ribonucleoprotein Particles/genetics
- Vault Ribonucleoprotein Particles/physiology
- Verapamil/pharmacology
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8
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van der Pol MA, Pater JM, Feller N, Westra AH, van Stijn A, Ossenkoppele GJ, Broxterman HJ, Schuurhuis GJ. Functional characterization of minimal residual disease for P-glycoprotein and multidrug resistance protein activity in acute myeloid leukemia. Leukemia 2001; 15:1554-63. [PMID: 11587213 DOI: 10.1038/sj.leu.2402245] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Relapse is common in acute myeloid leukemia (AML) due to persistence of residual leukemia cells: minimal residual disease (MRD). In 102 out of 127 patients (80%), cells at diagnosis displayed one or more leukemia-associated phenotypes (LAP), ie combinations of cell surface markers which are absent in normal cells and can thus be used to detect MRD at follow-up. Functional characterization of MRD cells for P-glycoprotein (Pgp) and multidrug resistance protein (MRP) activity is essential to investigate the role of these drug transport proteins in multidrug resistance in AML. A fluorescent probe assay using Syto16/PSC833 and calcein-AM/probenecid as substrate/modulator of the Pgp and MRP pump, respectively, and subsequent labeling of cells with monoclonal antibodies for LAP detection allowed simultaneous detection of LAP and Pgp or MRP activity. Validation of this assay is shown for 30 newly diagnosed AML and 11 MRD situations. In addition, no significant differences were found when comparing fresh and cryopreserved de novo AML for LAP expression (n = 43), Pgp (n = 30) and MRP (n = 24) function and for MRD samples for simultaneous LAP expression and Pgp/MRP activity (n = 10). This approach enables longitudinal and multicenter studies on the detection, quantification and functional characterisation of MRD cells.
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MESH Headings
- ATP Binding Cassette Transporter, Subfamily B, Member 1/analysis
- ATP Binding Cassette Transporter, Subfamily B, Member 1/metabolism
- Acute Disease
- Adolescent
- Adult
- Aged
- Antigens, Neoplasm/analysis
- Antigens, Surface/analysis
- Cryopreservation
- Drug Resistance, Multiple
- Female
- Flow Cytometry/methods
- Humans
- Immunophenotyping
- Leukemia, Myeloid/immunology
- Leukemia, Myeloid/metabolism
- Leukemia, Myeloid/pathology
- Male
- Middle Aged
- Multidrug Resistance-Associated Proteins/analysis
- Multidrug Resistance-Associated Proteins/metabolism
- Neoplasm, Residual/immunology
- Neoplasm, Residual/metabolism
- Neoplasm, Residual/pathology
- Specimen Handling
- Tumor Cells, Cultured
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Affiliation(s)
- M A van der Pol
- Department of Hematology, Medical Center Vrije Universiteit, Amsterdam, The Netherlands
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9
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Tidefelt U, Liliemark J, Gruber A, Liliemark E, Sundman-Engberg B, Juliusson G, Stenke L, Elmhorn-Rosenborg A, Möllgård L, Lehman S, Xu D, Covelli A, Gustavsson B, Paul C. P-Glycoprotein inhibitor valspodar (PSC 833) increases the intracellular concentrations of daunorubicin in vivo in patients with P-glycoprotein-positive acute myeloid leukemia. J Clin Oncol 2000; 18:1837-44. [PMID: 10784624 DOI: 10.1200/jco.2000.18.9.1837] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
PURPOSE The aim of the present study was to evaluate the effect of the cyclosporine derivative valspodar (PSC 833; Amdray, Novartis Pharma, Basel, Switzerland) on the concentration of daunorubicin (dnr) in leukemic blast cells in vivo during treatment. PATIENTS AND METHODS Ten patients with acute myeloid leukemia (AML) were included. Leukemic cells from seven of the patients were P-glycoprotein (Pgp)-positive. dnr 100 mg/m(2) was given as a continuous infusion over 72 hours. After 24 hours, a loading dose of valspodar was given, followed by a 36-hour infusion of 10 mg/kg per 24 hours. Blood samples were drawn at regular intervals, and concentrations of dnr and its main metabolite, daunorubicinol, in plasma and isolated leukemic cells were determined by high-pressure liquid chromatography. RESULTS The mean dnr concentrations in leukemic cells 24 hours after the start of infusion (before valspodar) were 18.8 micromol/L in Pgp-negative samples and 13.5 micromol/L in Pgp-positive samples. After 8 hours of valspodar infusion, these values were 25.8 and 24.0 micromol/L, respectively. The effect of valspodar was evaluated from the ratio of the area under the curve (AUC) for dnr concentration versus time in leukemic cells to the AUC for dnr concentration against time in the plasma. For the seven patients with Pgp-positive leukemia, the mean ratio increased by 52%, from 545 on day 1 to 830 on day 2 (P<.05) when valspodar was given. In the three patients with Pgp-negative leukemia, no significant difference was observed. CONCLUSION These results strongly suggest that valspodar, by interacting with Pgp, can increase the cellular uptake of dnr in leukemic blasts in vivo.
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Affiliation(s)
- U Tidefelt
- Department of Hematology, Orebro Medical Center Hospital, Orebro, Sweden.
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10
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Kobayashi H, Takemura Y, Kawai Y, Miyachi H, Kawabata M, Matsumura T, Yamashita T, Mori S, Furihata K, Shimodaira S, Motoyoshi K, Hotta T, Sekiguchi S, Ando Y, Watanabe K. Competitive reverse transcription-polymerase chain reaction assay for quantification of human multidrug resistance 1 (MDR1) gene expression in fresh leukemic cells. THE JOURNAL OF LABORATORY AND CLINICAL MEDICINE 2000; 135:199-209. [PMID: 10695666 DOI: 10.1067/mlc.2000.104461] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We have analyzed MDR1 gene expression in 69 clinical samples obtained from 64 patients with leukemic hematologic malignancies by using a competitive reverse transcription-polymerase chain reaction assay with a heterologous competitor RNA. To exclude a false-positive result caused by concomitant normal lymphocytes that physiologically express MDR1, in samples we determined a cut-off value of 8 amol MDR1 transcript per microgram of RNA by simultaneous measurement of rhodamine 123 dye efflux either in lymphocyte or gated leukemic cell populations. Consequently, 23 of 69 samples were concluded to be MDR1-positive in leukemic cells per se. The MDR1 expression rate was significantly correlated with factors such as a history of preceding chemotherapy, elder age of the patient, and certain disease types (eg, leukemia progressed from myelodysplastic syndrome). Moreover, the complete response rate after chemotherapy was significantly higher in MDR1-negative patients than in MDR1-positive patients (52% vs 17%, respectively; P = .01). The assay established will enable the quantification of MDR1 gene expression in blood samples from patients with leukemic hematologic malignancies and will be applicable to clinical laboratories as a routine test.
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Affiliation(s)
- H Kobayashi
- Department of Laboratory Medicine, National Defense Medical College, Saitama, Japan
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11
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N'cho M, Hobbs JA, Brahmi Z. Over-expression of multidrug resistance P-glycoprotein inhibits NK granule-mediated lytic ability without affecting the Fas lytic pathway. Hum Immunol 1999; 60:223-30. [PMID: 10321958 DOI: 10.1016/s0198-8859(98)00112-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Multidrug resistance (MDR) in tumor cells is commonly associated wich the over-expression of P-glycoprotein (Pgp), the product of the MDR1 gene. In this study, we investigated whether over-expression of Pgp in natural killer (NK) cells would influence their granule- as well as fas-mediated cytolytic activities. YT-INDY, a human NK-like cell line, was transfected with the MDR 1 gene, then tested for Pgp activity the presence of various concentrations of R-verapamil, a potent Pgp inhibitor. We showed that, unlike control YT-INDY, the Pgp activity of the transfectants (YT-mdr(+)) was only partially inhibited by R-verapamil. We also showed that Fas lytic activity was unaltered and that the loss of granule-mediated cytotoxicity was not due to reduced LFA-1 expression or to a decrease in target cell (TC) binding. Our data indicate that Pgp may be involved in the release of cytotoxic molecules.
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Affiliation(s)
- M N'cho
- Department of Microbiology/Immunology, Indiana University School of Medicine, Indianapolis 46202-5200, USA
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