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Błauż A, Wachulec M, Rychlik B. Oncostatin M reverses ABCG2-mediated mitoxantrone resistance. Biomed Pharmacother 2024; 176:116861. [PMID: 38850649 DOI: 10.1016/j.biopha.2024.116861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Revised: 05/21/2024] [Accepted: 06/03/2024] [Indexed: 06/10/2024] Open
Abstract
Mitoxantrone resistant variant of SW620 line was developed, characterized and subsequently used as a model system to determine oncostatin M ability to modulate MDR phenomenon. The selection regimen allowed for overexpression of ABCG2 and ABCB1 both at the RNA and protein level, which was further confirmed by functional assays. Oncostatin M supplementation resulted in partial reversal of MDR phenotype by decreasing overexpression of ABCG2 demonstrating for the first time the ability of this cytokine for selective down-regulation of one of MDR proteins.
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Affiliation(s)
- Andrzej Błauż
- Cytometry Laboratory, Department of Oncobiology and Epigenetics, Faculty of Biology and Environmental Protection, University of Lodz, Poland.
| | - Marcin Wachulec
- Cytometry Laboratory, Department of Oncobiology and Epigenetics, Faculty of Biology and Environmental Protection, University of Lodz, Poland
| | - Błażej Rychlik
- Cytometry Laboratory, Department of Oncobiology and Epigenetics, Faculty of Biology and Environmental Protection, University of Lodz, Poland
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2
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Gose T, Aitken HM, Wang Y, Lynch J, Rampersaud E, Fukuda Y, Wills M, Baril SA, Ford RC, Shelat A, Mara MLO, Schuetz JD. The net electrostatic potential and hydration of ABCG2 affect substrate transport. Nat Commun 2023; 14:5035. [PMID: 37596258 PMCID: PMC10439158 DOI: 10.1038/s41467-023-40610-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 08/03/2023] [Indexed: 08/20/2023] Open
Abstract
ABCG2 is a medically important ATP-binding cassette transporter with crucial roles in the absorption and distribution of chemically-diverse toxins and drugs, reducing the cellular accumulation of chemotherapeutic drugs to facilitate multidrug resistance in cancer. ABCG2's capacity to transport both hydrophilic and hydrophobic compounds is not well understood. Here we assess the molecular basis for substrate discrimination by the binding pocket. Substitution of a phylogenetically-conserved polar residue, N436, to alanine in the binding pocket of human ABCG2 permits only hydrophobic substrate transport, revealing the unique role of N436 as a discriminator. Molecular dynamics simulations show that this alanine substitution alters the electrostatic potential of the binding pocket favoring hydration of the transport pore. This change affects the contact with substrates and inhibitors, abrogating hydrophilic compound transport while retaining the transport of hydrophobic compounds. The N436 residue is also required for optimal transport inhibition of ABCG2, as many inhibitors are functionally impaired by this ABCG2 mutation. Overall, these findings have biomedical implications, broadly extending our understanding of substrate and inhibitor interactions.
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Affiliation(s)
- Tomoka Gose
- Department of Pharmacy and Pharmaceutical Sciences, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN, 38105, USA
| | - Heather M Aitken
- Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, Australia, Cnr College Rd & Cooper Rd, St Lucia, QLD, 4072, Australia
| | - Yao Wang
- Department of Pharmacy and Pharmaceutical Sciences, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN, 38105, USA
| | - John Lynch
- Department of Pharmacy and Pharmaceutical Sciences, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN, 38105, USA
| | - Evadnie Rampersaud
- Center for Applied Bioinformatics, St Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN, 38105, USA
| | - Yu Fukuda
- Department of Pharmacy and Pharmaceutical Sciences, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN, 38105, USA
| | - Medb Wills
- Department of Pharmacy and Pharmaceutical Sciences, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN, 38105, USA
| | - Stefanie A Baril
- Department of Pharmacy and Pharmaceutical Sciences, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN, 38105, USA
| | - Robert C Ford
- School of Biological Sciences, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Anang Shelat
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN, 38105, USA
| | - Megan L O' Mara
- Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, Australia, Cnr College Rd & Cooper Rd, St Lucia, QLD, 4072, Australia
| | - John D Schuetz
- Department of Pharmacy and Pharmaceutical Sciences, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN, 38105, USA.
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3
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Li Y, Xu X, Wang X, Zhang C, Hu A, Li Y. MGST1 Expression Is Associated with Poor Prognosis, Enhancing the Wnt/β-Catenin Pathway via Regulating AKT and Inhibiting Ferroptosis in Gastric Cancer. ACS OMEGA 2023; 8:23683-23694. [PMID: 37426275 PMCID: PMC10323946 DOI: 10.1021/acsomega.3c01782] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Accepted: 06/01/2023] [Indexed: 07/11/2023]
Abstract
BACKGROUND The role of microsomal glutathione S-transferase 1 (MGST1) underlying gastric cancer (GC) is unclear. The purpose of this research was to study the expression level and biological functions of MGST1 in GC cells. METHODS Expression of MGST1 was detected by RT-qPCR, Western blot (WB), and immunohistochemical staining. MGST1 was knockdown and overexpression by short hairpin RNA lentivirus in GC cells. Cell proliferation was evaluated by the CCK-8 assay and EDU assay. The cell cycle was detected by flow cytometry. The TOP-Flash reporter assay was used to examine the activity of T-cell factor/lymphoid enhancer factor transcription based on β-catenin. WB was performed to assess the protein levels involved in the cell signaling pathway and ferroptosis. The MAD assay and C11 BODIPY 581/591 lipid peroxidation probe assay were performed to determine the reactive oxygen species lipid level in GC cells. RESULTS MGST1 expression was upregulated in GC and it was correlated with poor overall survival of GC patients. MGST1 knockdown significantly inhibited GC cell proliferation and cell cycle by regulating the AKT/GSK-3β/β-catenin axis. In addition, we found that MGST1 inhibits ferroptosis in GC cells. CONCLUSION These findings suggested that MGST1 played a confirmed role in promoting GC development and serving as a possible independent prognostic factor for GC.
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Affiliation(s)
- Yaxian Li
- General
Surgery Department, The First Affiliated
Hospital of Anhui Medical University, Hefei 230000, China
| | - Xin Xu
- General
Surgery Department, The First Affiliated
Hospital of Anhui Medical University, Hefei 230000, China
| | - Xiaodong Wang
- General
Surgery Department, The First Affiliated
Hospital of Anhui Medical University, Hefei 230000, China
- The
Robert Bosch Center for Tumor Diseases (RBCT), Stuttgart 70376, Germany
| | - Chaoyang Zhang
- General
Surgery Department, The First Affiliated
Hospital of Anhui Medical University, Hefei 230000, China
| | - Asheng Hu
- General
Surgery Department, The First Affiliated
Hospital of Anhui Medical University, Hefei 230000, China
| | - Yongxiang Li
- General
Surgery Department, The First Affiliated
Hospital of Anhui Medical University, Hefei 230000, China
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4
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Romeo HE, Barreiro Arcos ML. Clinical relevance of stem cells in lung cancer. World J Stem Cells 2023; 15:576-588. [PMID: 37424954 PMCID: PMC10324501 DOI: 10.4252/wjsc.v15.i6.576] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 03/18/2023] [Accepted: 05/08/2023] [Indexed: 06/26/2023] Open
Abstract
Lung cancer is the major cause of cancer-related deaths worldwide, it has one of the lowest 5-year survival rate, mainly because it is diagnosed in the late stage of the disease. Lung cancer is classified into two groups, small cell lung cancer (SCLC) and non-SCLC (NSCLC). In turn, NSCLC is categorized into three distinct cell subtypes: Adenocarcinoma, squamous cell carcinoma, and large cell carcinoma. NSCLC is the most common lung cancer, accounting for 85% of all lung cancers. Treatment for lung cancer is linked to the cell type and stage of the disease, involving chemotherapy, radiation therapy, and surgery. Despite improvements in therapeutic treatments, lung cancer patients show high rates of recurrence, metastasis, and resistance to chemotherapy. Lung stem cells (SCs) are undifferentiated cells capable of self-renewal and proliferation, are resistant to chemotherapy and radiotherapy and, due to their properties, could be involved in the development and progression of lung cancer. The presence of SCs in the lung tissue could be the reason why lung cancer is difficult to treat. The identification of lung cancer stem cells biomarkers is of interest for precision medicine using new therapeutic agents directed against these cell populations. In this review, we present the current knowledge on lung SCs and discuss their functional role in the initiation and progression of lung cancer, as well as their role in tumor resistance to chemotherapy.
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Affiliation(s)
- Horacio Eduardo Romeo
- School of Engineering and Agrarian Sciences, Pontifical Catholic University of Argentina, Institute of Biomedical Research (BIOMED-UCA-CONICET), CABA C1107AAZ, Buenos Aires, Argentina
| | - María Laura Barreiro Arcos
- School of Engineering and Agrarian Sciences, Pontifical Catholic University of Argentina, Institute of Biomedical Research (BIOMED-UCA-CONICET), CABA C1107AAZ, Buenos Aires, Argentina
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5
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Jing W, Zhou M, Chen R, Ye X, Li W, Su X, Luo J, Wang Z, Peng S. In vitro and ex vivo anti‑tumor effect and mechanism of Tucatinib in leukemia stem cells and ABCG2‑overexpressing leukemia cells. Oncol Rep 2020; 45:1142-1152. [PMID: 33650639 PMCID: PMC7859976 DOI: 10.3892/or.2020.7915] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2020] [Accepted: 11/20/2020] [Indexed: 12/28/2022] Open
Abstract
Leukemia stem cells (LSCs), which evade standard chemotherapy, may lead to chemoresistance and disease relapse. The overexpression of ATP-binding cassette subfamily G member 2 (ABCG2) is an important determinant of drug resistance in LSCs and it can serve as a marker for LSCs. Targeting ABCG2 is a potential strategy to selectively treat and eradicate LSCs, and, hence, improve leukemia therapy. Tucatinib (Irbinitinib) is a novel tyrosine kinase inhibitor, targeting ErbB family member HER2, and was approved by the Food and Drug Administration in April 2020, and in Switzerland in May 2020 for the treatment of HER2-positive breast cancer. In the present study, the results demonstrated that tucatinib significantly improved the efficacy of conventional chemotherapeutic agents in ABCG2-overexpressing leukemia cells and primary leukemia blast cells, derived from patients with leukemia. In addition, tucatinib markedly decreased the proportion of leukemia stem cell-like side population (SP) cells. In SP cells, isolated from leukemia cells, the intracellular accumulation of Hoechst 33342, which is an ABCG2 substrate, was significantly elevated by tucatinib. Furthermore, tucatinib notably inhibited the efflux of [3H]-mitoxantrone and, hence, there was a higher level of [3H]-mitoxantrone in the HL60/ABCG2 cell line. The result from the ATPase assay revealed that tucatinib may interact with the drug substrate-binding site and stimulated ATPase activity of ABCG2. However, the protein expression level and cellular location of ABCG2 were not affected by tucatinib treatment. Taken together, these data suggested that tucatinib could sensitize conventional chemotherapeutic agents, in ABCG2-overexpressing leukemia cells and LSCs, by blocking the pump function of the ABCG2 protein. The present study revealed that combined treatment with tucatinib and conventional cytotoxic agents could be a potential therapeutic strategy in ABCG2-positive leukemia.
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Affiliation(s)
- Wen Jing
- Department of Anesthesiology, Sun Yat‑Sen Memorial Hospital, Sun Yat‑Sen University, Guangzhou, Guangdong 510289, P.R. China
| | - Mao Zhou
- Department of Anesthesiology, Sun Yat‑Sen Memorial Hospital, Sun Yat‑Sen University, Guangzhou, Guangdong 510289, P.R. China
| | - Ruixia Chen
- Department of Anesthesiology, Sun Yat‑Sen Memorial Hospital, Sun Yat‑Sen University, Guangzhou, Guangdong 510289, P.R. China
| | - Xijiu Ye
- Department of Anesthesiology, Sun Yat‑Sen Memorial Hospital, Sun Yat‑Sen University, Guangzhou, Guangdong 510289, P.R. China
| | - Weixing Li
- Department of Anesthesiology, Sun Yat‑Sen Memorial Hospital, Sun Yat‑Sen University, Guangzhou, Guangdong 510289, P.R. China
| | - Xiangfei Su
- Department of Anesthesiology, Sun Yat‑Sen Memorial Hospital, Sun Yat‑Sen University, Guangzhou, Guangdong 510289, P.R. China
| | - Jianwei Luo
- Department of Anesthesiology, Sun Yat‑Sen Memorial Hospital, Sun Yat‑Sen University, Guangzhou, Guangdong 510289, P.R. China
| | - Zhi Wang
- Department of Anesthesiology, Sun Yat‑Sen Memorial Hospital, Sun Yat‑Sen University, Guangzhou, Guangdong 510289, P.R. China
| | - Shuling Peng
- Department of Anesthesiology, Sun Yat‑Sen Memorial Hospital, Sun Yat‑Sen University, Guangzhou, Guangdong 510289, P.R. China
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6
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Smith PJ, Darzynkiewicz Z, Errington RJ. Nuclear cytometry and chromatin organization. Cytometry A 2018; 93:771-784. [PMID: 30144297 DOI: 10.1002/cyto.a.23521] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Revised: 05/25/2018] [Accepted: 06/13/2018] [Indexed: 12/18/2022]
Abstract
The nuclear-targeting chemical probe, for the detection and quantification of DNA within cells, has been a mainstay of cytometry-from the colorimetric Feulgen stain to smart fluorescent agents with tuned functionality. The level of nuclear structure and function at which the probe aims to readout, or indeed at which a DNA-targeted drug acts, is shadowed by a wide range of detection modalities and analytical methods. These methods are invariably limited in terms of the resolution attainable versus the volume occupied by targeted chromatin structures. The scalar challenge arises from the need to understand the extent and different levels of compaction of genomic DNA and how such structures can be re-modeled, reported, or even perturbed by both probes and drugs. Nuclear cytometry can report on the complex levels of chromatin order, disorder, disassembly, and even active disruption by probes and drugs. Nuclear probes can report defining features of clinical and therapeutic interest as in NETosis and other cell death processes. New cytometric approaches continue to bridge the scalar challenges of analyzing chromatin organization. Advances in super-resolution microscopy address the resolution and depth of analysis issues in cellular systems. Typical of recent insights into chromatin organization enabled by exploiting a DNA interacting probe is ChromEM tomography (ChromEMT). ChromEMT uses the unique properties of the anthraquinone-based cytometric dye DRAQ5™ to reveal that local and global 3D chromatin structures effect differences in compaction. The focus of this review is nuclear and chromatin cytometry, with linked reference to DNA targeting probes and drugs as exemplified by the anthracenediones.
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Affiliation(s)
- Paul J Smith
- Division of Cancer and Genetics, School of Medicine, Cardiff University, Cardiff, CF14 4XN, UK
| | - Zbigniew Darzynkiewicz
- Department of Pathology, Brander Cancer Research Institute, New York Medical College, Valhalla, New York, 10595
| | - Rachel J Errington
- Division of Cancer and Genetics, School of Medicine, Cardiff University, Cardiff, CF14 4XN, UK
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7
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Zhang W, Meng Y, Liu N, Wen XF, Yang T. Insights into Chemoresistance of Prostate Cancer. Int J Biol Sci 2015; 11:1160-70. [PMID: 26327810 PMCID: PMC4551752 DOI: 10.7150/ijbs.11439] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2014] [Accepted: 06/29/2015] [Indexed: 12/17/2022] Open
Abstract
Prostate cancer (PCa) remains the most prevalent malignancy among males in the western world. Though hormonal therapies through chemical or surgical castration have been proposed many years ago, heretofore, such mainstay for the treatment on advanced PCa has not fundamentally changed. These therapeutic responses are temporary and most cases will eventually undergo PCa recurrence and metastasis, or even progress to castration-resistant prostate cancer (CRPC) due to persistent development of drug resistance. Prostate cancer stem cells (PCSCs) are a small population of cells, which possess unlimited self-renewal capacities, and can regenerate tumorigenic progenies, and play an essential role in PCa therapy resistance, metastasis and recurrence. Nowadays advanced progresses have been made in understanding of PCSC properties, roles of androgen receptor signaling and ATP-binding cassette sub-family G member 2 (ABCG2), as well as roles of genomic non-coding microRNAs and key signaling pathways, which have led to the development of novel therapies which are active against chemoresistant PCa and CRPC. Based on these progresses, this review is dedicated to address mechanisms underlying PCa chemoresistance, unveil crosstalks among pivotal signaling pathways, explore novel biotherapeutic agents, and elaborate functional properties and specific roles of chemoresistant PCSCs, which may act as a promising target for novel therapies against chemoresistant PCa.
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Affiliation(s)
- Wei Zhang
- 1. Department of Pharmacology, School of Basic Medicine, Hebei University of Chinese Medicine, Shijiazhuang 050200, China
| | - Yan Meng
- 2. Research Center for Translational Medicine, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Na Liu
- 3. Department of Nephrology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Xiao-Fei Wen
- 4. Department of Urology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Tao Yang
- 2. Research Center for Translational Medicine, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
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8
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Hayashi D, Tsukioka N, Inoue Y, Matsubayashi Y, Iizuka T, Higuchi K, Ikegami Y, Kawasaki T. Synthesis and ABCG2 inhibitory evaluation of 5-N-acetylardeemin derivatives. Bioorg Med Chem 2015; 23:2010-23. [PMID: 25835358 DOI: 10.1016/j.bmc.2015.03.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Revised: 03/04/2015] [Accepted: 03/05/2015] [Indexed: 12/13/2022]
Abstract
An efficient and versatile synthesis of 5-N-acetylardeemin (1a) and sixteen 2-, 3- and 13-substituted derivatives 1b-q was achieved through Ugi three-component reaction of 3,3a,8,8a-tetrahydropyrrolo[2,3-b]indole and cyclization/epimerization. Their inhibitory activity on the drug efflux of breast cancer resistance protein (ABCG2) was evaluated by flow cytometric analysis of accumulation of Hoechst 33342 stain in Flp-In-293/ABCG2 cells. Most of the derivatives exhibited a stronger ABCG2 inhibitory effect compared with natural product 1a. The derivative 1m with a 4-tolyl substituent at the C-13 position exhibited the most potent ABCG2 inhibition. This preliminary structure-activity relationship study indicates that an electron-rich aryl moiety as the 13-substituent is key to increasing the inhibitory activity.
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Affiliation(s)
- Daigo Hayashi
- Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan
| | - Naoki Tsukioka
- Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan
| | - Yutaka Inoue
- Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan
| | | | - Toshimasa Iizuka
- Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan
| | - Kazuhiro Higuchi
- Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan.
| | - Yoji Ikegami
- Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan
| | - Tomomi Kawasaki
- Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan.
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9
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Khan IS, Ehtesham M. Isolation and characterization of stem cells from human central nervous system malignancies. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2015; 853:33-47. [PMID: 25895706 DOI: 10.1007/978-3-319-16537-0_3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Central Nervous System (CNS) tumors include some of the most invasive and lethal tumors in humans. The poor prognosis in patients with CNS tumors is ascribed to their invasive nature. After the description of a stem cell-like cohort in hematopoietic cancers, tumor stem cells (TSCs) have been isolated from a variety of solid tumors, including brain tumors. Further research has uncovered the crucial role these cells play in the initiation and propagation of brain tumors. More importantly, TSCs have also been shown to be relatively resistant to conventional cytotoxic therapeutics, which may also account for the alarmingly high rate of CNS tumor recurrence. In order to elucidate prospective therapeutic targets it is imperative to study these cells in detail and to accomplish this, we need to be able to reliably isolate and characterize these cells. This chapter will therefore, provide an overview of the methods used to isolate and characterize stem cells from human CNS malignancies.
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Affiliation(s)
- Imad Saeed Khan
- Section of Neurosurgery, Geisel School of Medicine at Dartmouth, Lebanon, NH, USA
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10
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Bakhsheshian J, Hall MD, Robey RW, Herrmann MA, Chen JQ, Bates SE, Gottesman MM. Overlapping substrate and inhibitor specificity of human and murine ABCG2. Drug Metab Dispos 2013; 41:1805-12. [PMID: 23868912 DOI: 10.1124/dmd.113.053140] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
ABCG2 (also known as breast cancer resistance protein) is an ATP-binding cassette (ABC) transporter localized to the plasma membrane where it mediates the efflux of xenobiotics, including potential therapeutics. Studies investigating Abcg2 function at the blood-brain barrier in mouse models are often compared with human ABCG2 function. It is critical to understand the nature of species differences between mouse and human ABCG2, since extrapolations are made from murine data to humans. Two independent drug-selected cell line pairs expressing human or mouse ABCG2 were compared for efflux of fluorescent substrates using flow cytometry. To this end, we developed and characterized a new mouse Abcg2-expressing subline that demonstrated efflux of known fluorescent ABCG2 substrates and increased resistance to mitoxantrone, which is reduced in the presence of the ABCG2 inhibitor Ko143. Our results indicate that the substrate specificity of human and mouse ABCG2 is very similar. We identified a new human and mouse ABCG2 substrate, a porphyrin analog, purpurin-18 (Pp-18), which is not a substrate for P-glycoprotein or multidrug resistance protein 1. The ability of inhibitors to block efflux activity of ABCG2 was assessed using Pp-18. Inhibitors also demonstrated similar effects on human and mouse ABCG2. Chrysin, benzoflavone, and cyclosporin A inhibited Pp-18 efflux in both human and mouse ABCG2. The similarity of the substrate and inhibitor specificity of human and mouse ABCG2 supports interpretation of mouse models in understanding the clinical, pharmacological, and physiologic roles of ABCG2.
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Affiliation(s)
- Joshua Bakhsheshian
- Laboratory of Cell Biology (J.B., M.D.H., M.M.G.), Cancer Therapeutics Branch (R.W.R., S.E.B.), Collaborative Protein Technology Resource (M.A.H., J.-Q.C.), Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
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11
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Smith PJ, Wiltshire M, Chappell SC, Cosentino L, Burns PA, Pors K, Errington RJ. Kinetic analysis of intracellular Hoechst 33342-DNA interactions by flow cytometry: Misinterpretation of side population status? Cytometry A 2012; 83:161-9. [DOI: 10.1002/cyto.a.22224] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Revised: 09/14/2012] [Accepted: 10/06/2012] [Indexed: 12/30/2022]
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12
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Gould NS, Min E, Martin RJ, Day BJ. CFTR is the primary known apical glutathione transporter involved in cigarette smoke-induced adaptive responses in the lung. Free Radic Biol Med 2012; 52:1201-6. [PMID: 22266045 PMCID: PMC3920665 DOI: 10.1016/j.freeradbiomed.2012.01.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Revised: 12/14/2011] [Accepted: 01/04/2012] [Indexed: 10/14/2022]
Abstract
One of the most abundant antioxidants in the lung is glutathione (GSH), a low-molecular-weight thiol, which functions to attenuate both oxidative stress and inflammation. GSH is concentrated in the epithelial lining fluid (ELF) of the lung and can be elevated in response to the increased oxidant burden from cigarette smoke (CS). However, the transporter(s) responsible for the increase in ELF GSH with cigarette smoke is not known. Three candidate apical GSH transporters in the lung are CFTR, BCRP, and MRP2, but their potential roles in ELF GSH transport in response to CS have not been investigated. In vitro, the inhibition of CFTR, BCRP, or MRP2 resulted in decreased GSH efflux in response to cigarette smoke extract. In vivo, mice deficient in CFTR, BCRP, or MRP2 were exposed to either air or acute CS. CFTR-deficient mice had reduced basal and CS-induced GSH in the ELF, whereas BCRP or MRP2 deficiency had no effect on ELF GSH basal or CS-exposed levels. Furthermore, BCRP or MRP2 deficiency had little effect on lung tissue GSH. These data indicate that CFTR is predominantly involved in maintaining basal ELF GSH and increasing ELF GSH in response to CS.
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Affiliation(s)
- Neal S. Gould
- Department of Medicine, National Jewish Health, Denver, CO
- Department of Pharmaceutical Sciences, University of Colorado Denver, Aurora, CO
| | - Elysia Min
- Department of Medicine, National Jewish Health, Denver, CO
| | - Richard J. Martin
- Department of Medicine, National Jewish Health, Denver, CO
- Department of Medicine, University of Colorado Denver, Aurora, CO
| | - Brian J. Day
- Department of Medicine, National Jewish Health, Denver, CO
- Department of Pharmaceutical Sciences, University of Colorado Denver, Aurora, CO
- Department of Medicine, University of Colorado Denver, Aurora, CO
- Department of Immunology, University of Colorado Denver, Aurora, CO
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13
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Atari MI, Chappell MJ, Errington RJ, Smith PJ, Evans ND. Kinetic modelling of the role of the aldehyde dehydrogenase enzyme and the breast cancer resistance protein in drug resistance and transport. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2011; 104:93-103. [PMID: 20621382 DOI: 10.1016/j.cmpb.2010.06.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2009] [Revised: 05/26/2010] [Accepted: 06/13/2010] [Indexed: 05/29/2023]
Abstract
A compartmental model for the in vitro uptake kinetics of the anti-cancer agent topotecan (TPT) has been extended from a previously published model. The extended model describes the drug activity and delivery of the pharmacologically active form to the DNA target as well as the catalysis of the aldehyde dehydrogenase (ALDH) enzyme and the elimination of drug from the cytoplasm via the efflux pump. Verification of the proposed model is achieved using scanning-laser microscopy data from live human breast cancer cells. Before estimating the unknown model parameters from the experimental in vitro data it is essential to determine parameter uniqueness (or otherwise) from this imposed output structure. This is formally performed as a structural identifiability analysis, which demonstrates that all of the unknown model parameters are uniquely determined by the output structure corresponding to the experiment.
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Affiliation(s)
- M I Atari
- School of Engineering, University of Warwick, Coventry CV4 7AL, UK.
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14
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Tárnok A. Cytometry for improving and tailoring cancer therapy. Cytometry A 2011; 79:667-8. [PMID: 21858924 DOI: 10.1002/cyto.a.21123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Morgenstern R, Zhang J, Johansson K. Microsomal glutathione transferase 1: mechanism and functional roles. Drug Metab Rev 2011; 43:300-6. [PMID: 21495795 DOI: 10.3109/03602532.2011.558511] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Microsomal glutathione transferase 1 (MGST1) belongs to a superfamily named MAPEG (membrane-associated proteins in eicosanoid and glutathione metabolism). This family is represented in all life forms, except archae. Of the six human members, three are specialized in the synthesis of leukotrienes and prostaglandin E, whereas the others (MGST1-3) have potential roles in drug metabolism. MGST1 has a well-established role in the conjugation of electrophiles and oxidative stress protection, whereas MGST2 and 3 have been less studied. Here, we review the recent advances regarding the structure, mechanism, and functional roles of MGST1. Emerging data show that the enzyme is overexpressed in certain tumors and support a role for the enzyme in protecting cells from cytostatic drugs.
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Affiliation(s)
- Ralf Morgenstern
- Institute of Environmental Medicine, Division of Biochemical Toxicology, Karolinska Institutet, Stockholm, Sweden.
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Wang B, Xia YJ, Yan W, Xia LM, Liu M, Tian DA. Regulation of side population cells by TGF-β1-induced epithelial-mesenchymal transition in hepatocellular carcinoma cell lines SMMC-7721 and HepG2. Shijie Huaren Xiaohua Zazhi 2010; 18:2416-2421. [DOI: 10.11569/wcjd.v18.i23.2416] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To evaluate the influence of transforming growth factor-β1 (TGF-β1)-induced epithelial-mesenchymal transition (EMT) on side population cells in SMMC-7721.
METHODS: The percentages of SP cells in SMMC-7721 and HepG2 cells were analyzed by flow cytometry. TGF-β1 was added to the cultured SMMC7721 and HepG2 cells to induce EMT in vitro. Seventy-two hours later, cell morphological changes were observed, the protein expression of E-cadherin was detected by Western blot and immunofluorescence, and the changes in the percentages of SP cells were analyzed by flow cytometry.
RESULTS: An experimental system for the selection of SP cells from hepatocellular carcinoma cells was successfully established. There were 4.3% of SP cells in SMMC-7721 cells, and the expression of ABCG2 (ATP-binding cassette superfamily G member 2) was up-regulated in these SP cells. No SP cells were detected in HepG2 cells. After exposure to TGF-β1 for 72 h, SMMC-7721 cells showed significant morphological changes and reduced E-cadherin expression and SP cell percentage.
CONCLUSION: TGF-β1 is able to induce EMT and reduce the percentage of side population cells in hepatocellular carcinoma cell lines, suggesting that EMT may promote the invasion and metastasis of carcinoma cells by suppressing the proliferation of cancer stem cells.
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Hu W, Liu W. Side populations of glioblastoma cells are less sensitive to HSV-TK/GCV suicide gene therapy system than the non-side population. In Vitro Cell Dev Biol Anim 2010; 46:497-501. [PMID: 20135358 DOI: 10.1007/s11626-010-9274-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2009] [Accepted: 01/02/2010] [Indexed: 12/28/2022]
Abstract
Side populations of glioblastoma cells are resistant to chemotherapy basically due to ABCG2-mediated efflux of small-molecule drugs. The herpes simplex virus thymidine kinase/ganciclovir suicide gene therapy system is one of the best-characterized strategies for malignant tumors including glioblastoma. Since this system involves a small-molecule drug ganciclovir, we wonder if glioblastoma side population cells are able to "pump out" ganciclovir and thus resistant to this suicide gene therapy. By 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium assay, we found that side populations are more resistant to this system than non-side populations. By flow cytometry and competition assay, we found that ganciclovir is a substrate for ABCG2.
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Affiliation(s)
- Weiwei Hu
- Department of Neurosurgery, Second Affiliated Hospital, School of Medicine, Zhejiang University, No. 88 Jiefang Road, Hangzhou, 310009, China,
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Biotec Visions 2010, JanuaryâFebruary. Biotechnol J 2010. [DOI: 10.1002/biot.200900274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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