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Martinho N, Marquês JMT, Todoriko I, Prieto M, de Almeida RF, Silva LC. Effect of Cisplatin and Its Cationic Analogues in the Phase Behavior and Permeability of Model Lipid Bilayers. Mol Pharm 2023; 20:918-928. [PMID: 36700695 PMCID: PMC9906771 DOI: 10.1021/acs.molpharmaceut.2c00321] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Increasing evidence suggests a critical role of lipids in both the mechanisms of toxicity and resistance of cells to platinum(II) complexes. In particular, cisplatin and other analogues were reported to interact with lipids and transiently promote lipid phase changes both in the bulk membranes and in specific membrane domains. However, these processes are complex and not fully understood. In this work, cisplatin and its cationic species formed at pH 7.4 in low chloride concentrations were tested for their ability to induce phase changes in model membranes with different lipid compositions. Fluorescent probes that partition to different lipid phases were used to report on the fluidity of the membrane, and a leakage assay was performed to evaluate the effect of cisplatin in the permeability of these vesicles. The results showed that platinum(II) complex effects on membrane fluidity depend on membrane lipid composition and properties, promoting a stronger decrease in the fluidity of membranes containing gel phase. Moreover, at high concentration, these complexes were prone to alter the permeability of lipid membranes without inducing their collapse or aggregation.
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Affiliation(s)
- Nuno Martinho
- Research
Institute for Medicines (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, 1649-003Lisboa, Portugal,iBB—Institute
for Bioengineering and Biosciences and Department of Bioengineering,
Instituto Superior Técnico, Universidade
de Lisboa, Av. Rovisco Pais, 1649-003Lisboa, Portugal,Associate
Laboratory i4HB—Institute for Health and Bioeconomy at Instituto
Superior Técnico, Universidade de
Lisboa, Av. Rovisco Pais, 1649-003Lisboa, Portugal
| | - Joaquim M. T. Marquês
- Centro
de Química Estrutural, Institute of Molecular Sciences, Departamento
de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1649-003Lisboa, Portugal
| | - Iryna Todoriko
- Centro
de Química Estrutural, Institute of Molecular Sciences, Departamento
de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1649-003Lisboa, Portugal
| | - Manuel Prieto
- iBB—Institute
for Bioengineering and Biosciences and Department of Bioengineering,
Instituto Superior Técnico, Universidade
de Lisboa, Av. Rovisco Pais, 1649-003Lisboa, Portugal,Associate
Laboratory i4HB—Institute for Health and Bioeconomy at Instituto
Superior Técnico, Universidade de
Lisboa, Av. Rovisco Pais, 1649-003Lisboa, Portugal
| | - Rodrigo F.M. de Almeida
- Centro
de Química Estrutural, Institute of Molecular Sciences, Departamento
de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1649-003Lisboa, Portugal
| | - Liana C. Silva
- Research
Institute for Medicines (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, 1649-003Lisboa, Portugal,
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2
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Membrane Disintegration Caused by the Steroid Saponin Digitonin Is Related to the Presence of Cholesterol. Molecules 2015; 20:20146-60. [PMID: 26569199 PMCID: PMC6332127 DOI: 10.3390/molecules201119682] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Revised: 10/22/2015] [Accepted: 10/23/2015] [Indexed: 12/21/2022] Open
Abstract
In the present investigation we studied the molecular mechanisms of the monodesmosidic saponin digitonin on natural and artificial membranes. We measured the hemolytic activity of digitonin on red blood cells (RBCs). Also different lipid membrane models (large unilamellar vesicles, LUVs, and giant unilamellar vesicles, GUVs) in the presence and absence of cholesterol were employed. The stability and permeability of the different vesicle systems were studied by using calcein release assay, GUVs membrane permeability assay using confocal microscopy (CM) and fluorescence correlation spectroscopy (FCS) and vesicle size measurement by dynamic light scattering (DLS). The results support the essential role of cholesterol in explaining how digitonin can disintegrate biological and artificial membranes. Digitonin induces membrane permeability or causes membrane rupturing only in the presence of cholesterol in an all-or-none mechanism. This effect depends on the concentrations of both digitonin and cholesterol. At low concentrations, digitonin induces membrane permeability while keeping the membrane intact. When digitonin is combined with other drugs, a synergistic potentiation can be observed because it facilitates their uptake.
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Combinations of alkaloids affecting different molecular targets with the saponin digitonin can synergistically enhance trypanocidal activity against Trypanosoma brucei brucei. Antimicrob Agents Chemother 2015; 59:7011-7. [PMID: 26349826 DOI: 10.1128/aac.01315-15] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2015] [Accepted: 08/20/2015] [Indexed: 12/18/2022] Open
Abstract
The flagellate Trypanosoma brucei causes sleeping sickness in humans and nagana in animals. Only a few drugs are registered to treat trypanosomiasis, but those drugs show severe side effects. Also, because some pathogen strains have become resistant, new strategies are urgently needed to combat this parasitic disease. An underexplored possibility is the application of combinations of several trypanocidal agents, which may potentiate their trypanocidal activity in a synergistic fashion. In this study, the potential synergism of mutual combinations of bioactive alkaloids and alkaloids with a membrane-active steroidal saponin, digitonin, was explored with regard to their effect on T. b. brucei. Alkaloids were selected that affect different molecular targets: berberine and chelerythrine (intercalation of DNA), piperine (induction of apoptosis), vinblastine (inhibition of microtubule assembly), emetine (intercalation of DNA, inhibition of protein biosynthesis), homoharringtonine (inhibition of protein biosynthesis), and digitonin (membrane permeabilization and uptake facilitation of polar compounds). Most combinations resulted in an enhanced trypanocidal effect. The addition of digitonin significantly stimulated the activity of almost all alkaloids against trypanosomes. The strongest effect was measured in a combination of digitonin with vinblastine. The highest dose reduction indexes (DRI) were measured in the two-drug combination of digitonin or piperine with vinblastine, where the dose of vinblastine could be reduced 9.07-fold or 7.05-fold, respectively. The synergistic effects of mutual combinations of alkaloids and of alkaloids with digitonin present a new avenue to treat trypanosomiasis but one which needs to be corroborated in future animal experiments.
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Sanga S, Sinek JP, Frieboes HB, Ferrari M, Fruehauf JP, Cristini V. Mathematical modeling of cancer progression and response to chemotherapy. Expert Rev Anticancer Ther 2014; 6:1361-76. [PMID: 17069522 DOI: 10.1586/14737140.6.10.1361] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The complex, constantly evolving and multifaceted nature of cancer has made it difficult to identify unique molecular and pathophysiological signatures for each disease variant, consequently hindering development of effective therapies. Mathematical modeling and computer simulation are tools that can provide a robust framework to better understand cancer progression and response to chemotherapy. Successful therapeutic agents must overcome biological barriers occurring at multiple space and time scales and still reach targets at sufficient concentrations. A multiscale computer simulator founded on the integration of experimental data and mathematical models can provide valuable insights into these processes and establish a technology platform for analyzing the effectiveness of chemotherapeutic drugs, with the potential to cost-effectively and efficiently screen drug candidates during the drug-development process.
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Affiliation(s)
- Sandeep Sanga
- University of California, Department of Biomedical Engineering, Irvine, 3120, CA 92697-2715, USA.
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5
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Felth J, Rickardson L, Rosén J, Wickström M, Fryknäs M, Lindskog M, Bohlin L, Gullbo J. Cytotoxic effects of cardiac glycosides in colon cancer cells, alone and in combination with standard chemotherapeutic drugs. JOURNAL OF NATURAL PRODUCTS 2009; 72:1969-74. [PMID: 19894733 DOI: 10.1021/np900210m] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Cardiac glycosides have been reported to exhibit cytotoxic activity against several different cancer types, but studies against colorectal cancer are lacking. In a screening procedure aimed at identifying natural products with activity against colon cancer, several cardiac glycosides were shown to be of interest, and five of these were further evaluated in different colorectal cancer cell lines and primary cells from patients. Convallatoxin (1), oleandrin (4), and proscillaridin A (5) were identified as the most potent compounds (submicromolar IC50 values), and digitoxin (2) and digoxin (3), which are used in cardiac disease, exhibited somewhat lower activity (IC50 values 0.27-4.1 microM). Selected cardiac glycosides were tested in combination with four clinically relevant cytotoxic drugs (5-fluorouracil, oxaliplatin, cisplatin, irinotecan). The combination of 2 and oxaliplatin exhibited synergism including the otherwise highly drug-resistant HT29 cell line. A ChemGPS-NP application comparing modes of action of anticancer drugs identified cardiac glycosides as a separate cluster. These findings demonstrate that such substances may exhibit significant activity against colorectal cancer cell lines, by mechanisms disparate from currently used anticancer drugs, but at concentrations generally considered not achievable in patient plasma.
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Affiliation(s)
- Jenny Felth
- Division of Pharmacognosy, Department of Medicinal Chemistry, Biomedical Center, Uppsala University, Box 574, SE-751 23 Uppsala, Sweden.
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6
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Sinek JP, Sanga S, Zheng X, Frieboes HB, Ferrari M, Cristini V. Predicting drug pharmacokinetics and effect in vascularized tumors using computer simulation. J Math Biol 2008; 58:485-510. [PMID: 18781304 PMCID: PMC2782117 DOI: 10.1007/s00285-008-0214-y] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2007] [Revised: 01/30/2008] [Indexed: 10/26/2022]
Abstract
In this paper, we investigate the pharmacokinetics and effect of doxorubicin and cisplatin in vascularized tumors through two-dimensional simulations. We take into account especially vascular and morphological heterogeneity as well as cellular and lesion-level pharmacokinetic determinants like P-glycoprotein (Pgp) efflux and cell density. To do this we construct a multi-compartment PKPD model calibrated from published experimental data and simulate 2-h bolus administrations followed by 18-h drug washout. Our results show that lesion-scale drug and nutrient distribution may significantly impact therapeutic efficacy and should be considered as carefully as genetic determinants modulating, for example, the production of multidrug-resistance protein or topoisomerase II. We visualize and rigorously quantify distributions of nutrient, drug, and resulting cell inhibition. A main result is the existence of significant heterogeneity in all three, yielding poor inhibition in a large fraction of the lesion, and commensurately increased serum drug concentration necessary for an average 50% inhibition throughout the lesion (the IC(50) concentration). For doxorubicin the effect of hypoxia and hypoglycemia ("nutrient effect") is isolated and shown to further increase cell inhibition heterogeneity and double the IC(50), both undesirable. We also show how the therapeutic effectiveness of doxorubicin penetration therapy depends upon other determinants affecting drug distribution, such as cellular efflux and density, offering some insight into the conditions under which otherwise promising therapies may fail and, more importantly, when they will succeed. Cisplatin is used as a contrast to doxorubicin since both published experimental data and our simulations indicate its lesion distribution is more uniform than that of doxorubicin. Because of this some of the complexity in predicting its therapeutic efficacy is mitigated. Using this advantage, we show results suggesting that in vitro monolayer assays using this drug may more accurately predict in vivo performance than for drugs like doxorubicin. The nonlinear interaction among various determinants representing cell and lesion phenotype as well as therapeutic strategies is a unifying theme of our results. Throughout it can be appreciated that macroscopic environmental conditions, notably drug and nutrient distributions, give rise to considerable variation in lesion response, hence clinical resistance. Moreover, the synergy or antagonism of combined therapeutic strategies depends heavily upon this environment.
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Affiliation(s)
- John P Sinek
- Department of Mathematics, University of California, Irvine, CA, USA
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7
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Hall MD, Okabe M, Shen DW, Liang XJ, Gottesman MM. The role of cellular accumulation in determining sensitivity to platinum-based chemotherapy. Annu Rev Pharmacol Toxicol 2008; 48:495-535. [PMID: 17937596 DOI: 10.1146/annurev.pharmtox.48.080907.180426] [Citation(s) in RCA: 350] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The platinum (Pt) drugs cisplatin and carboplatin are heavily employed in chemotherapy regimens; however, similar to other classes of drugs, a number of intrinsic and acquired resistance mechanisms hamper their effectiveness. The method by which Pt drugs enter cells has traditionally been attributed to simple passive diffusion. However, recent evidence suggests a number of active uptake and efflux mechanisms are at play, and altered regulation of these transporters is responsible for the reduced accumulation of drug in resistant cells. This review suggests a model that helps reconcile the disparate literature by describing multiple pathways for Pt-containing drugs into and out of the cell.
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Affiliation(s)
- Matthew D Hall
- Laboratory of Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892-4255, USA
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Huang R, Southall N, Cho MH, Xia M, Inglese J, Austin CP. Characterization of diversity in toxicity mechanism using in vitro cytotoxicity assays in quantitative high throughput screening. Chem Res Toxicol 2008; 21:659-67. [PMID: 18281954 DOI: 10.1021/tx700365e] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Assessing the potential health risks of environmental chemical compounds is an expensive undertaking that has motivated the development of new alternatives to traditional in vivo toxicological testing. One approach is to stage the evaluation, beginning with less expensive and higher throughput in vitro testing before progressing to more definitive trials. In vitro testing can be used to generate a hypothesis about a compound's mechanism of action, which can then be used to design an appropriate in vivo experiment. Here we begin to address the question of how to design such a battery of in vitro cell-based assays by combining data from two different types of assays, cell viability and caspase activation, with the aim of elucidating the mechanism of action. Because caspase activation is a transient event during apoptosis, it is not possible to design a single end-point assay protocol that would identify all instances of compound-induced caspase activation. Nevertheless, useful information about compound mechanism of action can be obtained from these assays in combination with cell viability data. Unsupervised clustering in combination with Dunn's cluster validity index is a robust method for identifying mechanisms of action without requiring any a priori knowledge about mechanisms of toxicity. The performance of this clustering method is evaluated by comparing the clustering results against literature annotations of compound mechanisms.
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Affiliation(s)
- Ruili Huang
- NIH Chemical Genomics Center, National Institutes of Health, Bethesda, Maryland 20892-3370, USA.
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9
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Tanaka T, Kaneda Y, Li TS, Matsuoka T, Zempo N, Esato K. Digitonin enhances the antitumor effect of cisplatin during isolated lung perfusion. Ann Thorac Surg 2001; 72:1173-8. [PMID: 11603432 DOI: 10.1016/s0003-4975(01)03054-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND The antitumor effect of isolated lung perfusion with cisplatin was limited because the intracellular platinum concentration did not increase sufficiently. To solve this problem, digitonin, a detergent, was chosen to increase cell permeability and enhance intracellular uptake and antitumor effect. This study was designed to investigate toxicity, pharmacokinetics, and efficacy of isolated lung perfusion with the combined use of digitonin and cisplatin in Fischer 344 rats. METHODS Systemic and local toxicities of isolated lung perfusion treatment were evaluated on the basis of body weight change, survival rate, and histologic findings. The maximal tolerated dose of digitonin was determined by assessing survival on day 21 after contralateral pneumonectomy, body weight change, and histologic findings. Pharmacokinetics were observed in a solitary lung tumor nodule model by measuring platinum concentration in tumor and normal lung tissue. The antitumor effect was evaluated by the number of tumor nodules in the left lung 21 days after isolated lung perfusion. Isolated lung perfusion was performed 7 days after 1.0 x 10(6) methylcholanthrene sarcoma cells were injected into the external jugular vein. RESULTS The maximal tolerated dose of digitonin was 20 micromol/L. Platinum concentration of tumor nodules in the digitonin-cisplatin-treated rats was 20% higher than in the cisplatin-only group (5.48 +/- 0.64 microg/g tissue versus 4.50 +/- 1.09 microg/g tissue; p = 0.067). The number of pulmonary nodules decreased significantly by digitonin use (1.3 +/- 1.5 versus 9.7 +/- 2; p < 0.0001). CONCLUSIONS Isolated lung perfusion with digitonin and cisplatin in combination was performed safely and enhanced the antitumor effect. These drugs in combination show promise for enhancing the effect of clinical isolated lung perfusion.
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Affiliation(s)
- T Tanaka
- First Department of Surgery, Yamaguchi University School of Medicine, Ube, Japan.
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10
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Cemazar M, Miklavcic D, Mir LM, Belehradek J, Bonnay M, Fourcault D, Sersa G. Electrochemotherapy of tumours resistant to cisplatin: a study in a murine tumour model. Eur J Cancer 2001; 37:1166-72. [PMID: 11378348 DOI: 10.1016/s0959-8049(01)00091-0] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The aim of the study was to determine whether electrochemotherapy with cisplatin could be implemented in treatment of cisplatin-resistant solid tumours. For this purpose, we used cisplatin-sensitive TBL.Cl2 cells and their cisplatin-resistant subclone TBL.Cl2 Pt, which can be grown as in vitro cell cultures and as solid subcutaneous tumours in C57Bl/6 mice. Cytotoxicity of cisplatin alone and combined with electroporation was determined by colony forming assay. Treatment effects of electrochemotherapy in vivo were assessed by tumour growth delay and tumour curability. Platinum content in the cells and tumours was determined by atomic absorption spectroscopy. In vitro, TBL.Cl2 Pt cells were equally sensitive to electrochemotherapy as their cisplatin-sensitive counterparts. In vivo, electrochemotherapy was effective on both tumour types, resulting in a prolonged tumour growth delay and tumour cures. However, electrochemotherapy was more effective on parental than cisplatin-resistant tumours, in which platinum content was significantly lower compared with parental tumours. In conclusion, electrochemotherapy is an effective treatment of cisplatin-resistant solid tumours and may prove useful in clinical chemotherapy for the treatment of tumours with intrinsic or acquired resistance to cisplatin.
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Affiliation(s)
- M Cemazar
- Department of Tumor Biology, Institute of Oncology, Zaloska 2, SI-1000, Ljubljana, Slovenia.
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Sersa G, Kranjc S, Cemazar M. Improvement of combined modality therapy with cisplatin and radiation using electroporation of tumors. Int J Radiat Oncol Biol Phys 2000; 46:1037-41. [PMID: 10705027 DOI: 10.1016/s0360-3016(99)00464-2] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
PURPOSE To evaluate whether a local drug delivery method, i.e., electroporation of tumors, increases the radiosensitizing effect of cisplatin. METHODS AND MATERIALS Subcutaneous Ehrlich-Lettre ascites (EAT) tumors in CBA mice were treated either by cisplatin, electric pulses, or ionizing radiation. In electrochemotherapy protocol, electric pulses were given to the tumor 3 min after intravenous injection of cisplatin. The interval between electrochemotherapy and irradiation was 20 min. Treatment effectiveness was evaluated by tumor growth delay and local tumor curability. RESULTS Electrochemotherapy of EAT tumors proved to be effective treatment, resulting in 12% tumor cures, whereas treatment with cisplatin or electric pulses alone did not yield any tumor cures. As expected, injection of cisplatin 20 min prior to irradiation, increased radioresponse of tumors from 27% to 73% tumor cures. Electroporation of tumors also increased radiation response of tumors to 54% tumor cures. Electrochemotherapy given prior to irradiation increased radioresponsiveness of tumors, resulting in 92% tumor cures. CONCLUSIONS This study shows that delivery of cisplatin into the cells by electroporation of tumors increases the radiosensitizing effect of cisplatin. However, some effect may also be ascribed to application of electric pulses to the tumors that in our study also predisposed tumor cells to radiation damage.
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Affiliation(s)
- G Sersa
- Department of Tumor Biology, Institute of Oncology, Ljubljana, Slovenia.
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12
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Cemazar M, Miklavcic D, Scancar J, Dolzan V, Golouh R, Sersa G. Increased platinum accumulation in SA-1 tumour cells after in vivo electrochemotherapy with cisplatin. Br J Cancer 1999; 79:1386-91. [PMID: 10188880 PMCID: PMC2374264 DOI: 10.1038/sj.bjc.6690222] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Electrochemotherapy is an anti-tumour treatment that utilizes locally delivered electric pulses to increase cytotoxicity of chemotherapeutic drugs. The aim of our study was to determine whether anti-tumour effectiveness of electrochemotherapy with cisplatin is a consequence of increased plasma membrane permeability caused by electroporation that enables cisplatin binding to DNA. For this purpose, anti-tumour effectiveness of electrochemotherapy was evaluated on SA-1 tumours treated with electric pulses 3 min after intravenous injection of cisplatin (4 mg kg(-1)). Anti-tumour effectiveness was correlated with platinum accumulation in tumours and the amount of platinum bound to DNA, as determined by atomic absorption spectrometry. In tumours treated with electrochemotherapy, cell kill was increased by a factor of 20 compared with treatment with cisplatin only, as determined from tumour growth curves. The amount of platinum bound to DNA and platinum content in the tumours treated by electrochemotherapy was approximately two times higher than in cisplatin-treated tumours. Based on our results, we conclude that in vivo application of electric pulses potentiates anti-tumour effectiveness of cisplatin by electroporation that consequently results in cisplatin increased delivery into the cells. In addition, besides electroporation, immune system and tumour blood flow changes could be involved in the observed anti-tumour effectiveness of electrochemotherapy.
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Affiliation(s)
- M Cemazar
- Institute of Oncology, Ljubljana, Slovenia
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Canada RG, Paltoo DN. Binding of terbium and cisplatin to C13* human ovarian cancer cells using time-resolved terbium luminescence. BIOCHIMICA ET BIOPHYSICA ACTA 1998; 1448:85-98. [PMID: 9824675 DOI: 10.1016/s0167-4889(98)00127-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Terbium (Tb3+) has been shown to increase the cellular accumulation and cytotoxicity of cisplatin in cisplatin-resistant human breast and ovarian cancer cells. Time-resolved Tb3+ luminescence was used to describe the binding of cisplatin to cisplatin-resistant C13* cells. A high-affinity Tb3+ binding site was identified in the plasma membrane of the C13* cells (n=105+/-2 fmol/cell and Kd=36. 3+/-5.2 microM). The binding of Tb3+ is suggested to occur through a cation-pi interaction with tryptophan residues in the plasma membrane, resulting in an enhancement of the intensity and lifetime of Tb3+. Stern-Volmer quenching analysis revealed that the Tb3+ binding site is not readily accessible to the aqueous environment. The quenching of the Tb3+-C13* intensity by cisplatin occurred by static quenching processes, involving both a direct electron-exchange interaction as well as an indirect dipole-dipole resonant energy transfer mechanism. Formation of the Tb3+-C13*-cisplatin complex does not interfere with the high-affinity binding of Tb3+; cisplatin and Tb3+ bind within 5 to 10 A of each other. A specific terbium/cisplatin binding protein is suggested to play a role in the cellular accumulation and cytotoxicity of cisplatin. Therefore, the transport of cisplatin across the plasma membrane must also involve a facilitated diffusion process. Our results indicate that the binding of Tb3+ to the plasma membrane may be potentially useful in the reversal of cisplatin resistance.
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Affiliation(s)
- R G Canada
- Laboratory of Biophysical Cytochemistry, Department of Physiology and Biophysics, Howard University College of Medicine, Washington, DC 20059, USA
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14
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Sersa G, Stabuc B, Cemazar M, Jancar B, Miklavcic D, Rudolf Z. Electrochemotherapy with cisplatin: potentiation of local cisplatin antitumour effectiveness by application of electric pulses in cancer patients. Eur J Cancer 1998; 34:1213-8. [PMID: 9849482 DOI: 10.1016/s0959-8049(98)00025-2] [Citation(s) in RCA: 108] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
This study was aimed at assessing the response to electrochemotherapy with cisplatin of cutaneous tumour nodules in patients with malignant melanoma, squamous cell carcinoma and basal cell carcinoma. In 4 patients, 30 tumour nodules of different sizes were treated; five without treatment, one with electric pulses, five with cisplatin injected intratumorally and 19 with electrochemotherapy, i.e. intratumoral administration of cisplatin followed by delivery of electric pulses to the tumour nodule. After 4 weeks, a complete response (CR) in all 19 electrochemotherapy treated nodules was obtained. All electrochemotherapy treated nodules remained in CR (range 7-11 months), regardless of histological type, except for the metastasis of a squamous cell carcinoma that progressed after 9 months. CR was also obtained in two of five tumour nodules treated with cisplatin intratumorally, but the other three nodules progressed within 3-7 months. Exposure of the tumour nodule to electric pulses without cisplatin treatment had no effect on tumour growth. Electrochemotherapy was well tolerated by all patients and a good cosmetic effect was obtained, with only minimal scarring and a slight depigmentation of the skin. Electrochemotherapy with cisplatin has proved to be effective in patients with cutaneous tumour nodules. Furthermore, electrochemotherapy is easy to perform and can be carried out on an out-patient basis.
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Affiliation(s)
- G Sersa
- Institute of Oncology, Ljubljana, Slovenia
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15
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Minami T, Tohno Y, Tohno S, Utsumi M, Yamada M, Hashii K, Tateyama I, Kadota E, Okazaki Y. Tissue platinum after clinical treatment with cisplatin or carboplatin in tumor-bearing patients. Biol Trace Elem Res 1997; 58:77-83. [PMID: 9363322 DOI: 10.1007/bf02910668] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Tissue platinum (Pt) levels were measured in tumor-bearing patients treated with either cisplatin or carboplatin. Cisplatin was given by intra-arterial, intraperitoneal, and intravenous (iv) administrations. After death, vertebrae and intervertebral disks were removed from eight human subjects, and livers and kidneys were removed from the half of them. When cisplatin was administered intraperitoneally, Pt of the liver was higher than that of the kidney, and a high content of Pt was detected in the vertebra by comparing with the other administration methods. At the intra-arterial administration of cisplatin, Pt was mainly accumulated in the kidney. At the iv administration of cisplatin, a high level of Pt was found in the vertebra and intervertebral disk, especially at the highest value at 10.31 micrograms/g in the intervertebral disk of one case, whereas a low level of Pt was detected in the liver. On the contrary, it was found that the iv administration of carboplatin did not result in high accumulations of Pt in the liver, kidney, intervertebral disk, and vertebra. Therefore, Pt is accumulated in different organs, depending on the way cisplatin is administered, but Pt is accumulated least in them by the administration of carboplatin.
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Affiliation(s)
- T Minami
- Department of Clinical Chemistry, Faculty of Pharmaceutical Sciences, Kinki University, Osaka, Japan
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16
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Martinez-Irujo JJ, Villahermosa ML, Alberdi E, Santiago E. A checkerboard method to evaluate interactions between drugs. Biochem Pharmacol 1996; 51:635-44. [PMID: 8615900 DOI: 10.1016/s0006-2952(95)02230-9] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A method to evaluate interactions between biologically active agents is presented. Synergism, zero interaction, and antagonism were easily detected with the three-dimensional approach proposed herein. This method is compatible with a checkerboard design to diagnose the interaction between agents and obviate the need to test their mixtures in a fixed concentration ratio as proposed by Chou and Talalay. Dose-response curves for individual agents were obtained, and experimental data fitted to appropriate equations by nonlinear regression. If zero interaction was present, the predicted effect could be calculated for each combination using the classical isobole equation with any spreadsheet having a command to solve mathematical equations by iteration. This allowed the selection of appropriate concentrations for the combination of two or more agents. Interaction between agents could be assessed in two ways: by comparing experimental with expected effects, if zero interaction is present; or by analyzing the reduction or increase in total dose found as a consequence of the interaction. The applicability of both approaches is discussed and, for purposes of comparison with other methods, examples based on published data are analyzed and commented upon.
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Affiliation(s)
- J J Martinez-Irujo
- Department of Biochemistry and Molecular Biology, University of Navarra, Pamplona, Spain
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Parekh H, Simpkins H. Cross-resistance and collateral sensitivity to natural product drugs in cisplatin-sensitive and -resistant rat lymphoma and human ovarian carcinoma cells. Cancer Chemother Pharmacol 1996; 37:457-62. [PMID: 8599869 DOI: 10.1007/s002800050412] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The cytotoxicity of mitotic spindle poisons, vinca alkaloids and the anthracycline, adriamycin, against cisplatin-sensitive and -resistant rat lymphoma and human ovarian carcinoma cell lines was investigated. Interestingly, it was found that all cell lines were more sensitive to the mitotic spindle poisons, vincristine and vinblastine. Adriamycin was the least effective and taxol had intermediate activity. The Walker rat lymphoma cell line resistant to cisplatin (WR) exhibited the multiple drug resistance phenotype since it showed collateral resistance to all drugs (ranging from twofold to taxol, colcemid and colchicine and sixfold to the vinca alkaloids). Verapamil potentiated the cytotoxic activity of adriamycin and vincristine in a striking fashion with the Walker cells. P-glycoprotein was found to be present in the plasma membranes of the Walker cells with approximately a 2.5-fold increase in the WR as compared to the sensitive (WS) cells. Glutathione levels were elevated in all of the cisplatin-resistant cell lines when compared to the cisplatin-sensitive parental cell lines. A profound effect of buthionine sulfoximine pretreatment on adriamycin cytotoxicity was observed. Glutathione S-transferase (pi) was present in all the human cell lines but the WS cells had markedly lower levels (almost negligible) when compared to the WR cells. These observations imply that cisplatin-resistant cells may be more sensitive to mitotic spindle poisons and vinca alkaloids, irrespective of the mechanism of platinum resistance, and that the cytotoxicity of vinca alkaloids could be further modulated by verapamil, irrespective of the presence or absence of P-glycoprotein.
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Affiliation(s)
- H Parekh
- Department of Pathology and Laboratory Medicine, Temple University School of Medicine, Philadelphia, PA, 19140, USA
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Abstract
The aim of the present study was to summarize the effect of in vivo modulation of antibody kinetics and to present new data on the in vivo effect of the cell membrane active detergent Tween 80 and the cytokine interleukin-2 (IL-2) on the accumulation and clearance of a radioactive antibody. Mice bearing Lewis lung carcinoma xenografts and rats bearing DMBA-induced mammary carcinomas were studied after injecting I-125 labeled IgG1 monoclonal antibody (3c4c7g6) raised against a tyrosine kinase receptor protein Tie. Expression of Tie is known to be abundant in vascular endothelia and possibly related to malignant angiogenesis. Tween 80 was administered intratumorally (0.04% of tumor volume), whereas IL-2 was administered intraperitoneally. In the Lewis lung tumor model, the absolute tumor uptake varied between 2 and 5% ID/g, and maximum uptake was achieved after 24 h with Tween, and after 48 h without Tween. Tween manipulation did not increase the uptake in any normal organ, but it enhanced antibody clearance from the blood. In the DMBA rat model, IL-2 had no effect on blood clearance, but enhanced the uptake of Tie antibody into the tumor from 2.5-0.9 to 4.5-0.4% ID/g at 48 h. These data indicate that antibody biodistribution and pharmacokinetics can be modulated by a surface detergent and a cytokine, giving decreased exposure to critical organs, and increased uptake into the tumor. This type of manipulation provides an opportunity to optimize radioimmunotherapy.
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MESH Headings
- 9,10-Dimethyl-1,2-benzanthracene/adverse effects
- Adjuvants, Immunologic/administration & dosage
- Adjuvants, Immunologic/pharmacology
- Animals
- Antibodies, Monoclonal/blood
- Antibodies, Monoclonal/metabolism
- Carcinogens/adverse effects
- Carcinoma/chemically induced
- Carcinoma/metabolism
- Endothelium, Vascular/immunology
- Female
- Immunoconjugates/blood
- Immunoconjugates/drug effects
- Immunoconjugates/pharmacokinetics
- Immunoglobulin G/blood
- Immunoglobulin G/metabolism
- Injections, Intralesional
- Injections, Intraperitoneal
- Interleukin-2/pharmacology
- Iodine Radioisotopes/blood
- Iodine Radioisotopes/pharmacokinetics
- Lung Neoplasms/metabolism
- Lung Neoplasms/radiotherapy
- Mammary Neoplasms, Experimental/chemically induced
- Mammary Neoplasms, Experimental/metabolism
- Mice
- Neoplasm Transplantation
- Neovascularization, Pathologic/immunology
- Polysorbates/administration & dosage
- Polysorbates/pharmacology
- Rats
- Receptor Protein-Tyrosine Kinases/immunology
- Surface-Active Agents/administration & dosage
- Surface-Active Agents/pharmacology
- Time Factors
- Transplantation, Heterologous
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Affiliation(s)
- A Jekunen
- Department of Oncology, Helsinki University Central Hospital, Helsinki
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