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Zhang M, Zeng X, She M, Dong X, Chen J, Xiong Q, Qiu G, Yang S, Li X, Ren G. FRAX486, a PAK inhibitor, overcomes ABCB1-mediated multidrug resistance in breast cancer cells. Braz J Med Biol Res 2024; 57:e13357. [PMID: 38958364 PMCID: PMC11221864 DOI: 10.1590/1414-431x2024e13357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Accepted: 05/06/2024] [Indexed: 07/04/2024] Open
Abstract
The overexpression of P-glycoprotein (P-gp/ABCB1) is a leading cause of multidrug resistance (MDR). Hence, it is crucial to discover effective pharmaceuticals that counteract ABCB1-mediated multidrug resistance. FRAX486 is a p21-activated kinase (PAK) inhibitor. The objective of this study was to investigate whether FRAX486 can reverse ABCB1-mediated multidrug resistance, while also exploring its mechanism of action. The CCK8 assay demonstrated that FRAX486 significantly reversed ABCB1-mediated multidrug resistance. Furthermore, western blotting and immunofluorescence experiments revealed that FRAX486 had no impact on expression level and intracellular localization of ABCB1. Notably, FRAX486 was found to enhance intracellular drug accumulation and reduce efflux, resulting in the reversal of multidrug resistance. Docking analysis also indicated a strong affinity between FRAX486 and ABCB1. This study highlights the ability of FRAX486 to reverse ABCB1-mediated multidrug resistance and provides valuable insights for its clinical application.
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Affiliation(s)
- Meng Zhang
- Department of Thyroid and Breast Surgery, Shenzhen Hospital of Southern Medical University, Shenzhen, Guangdong, China
| | - Xiaoqi Zeng
- Department of Thyroid and Breast Surgery, Shenzhen Hospital of Southern Medical University, Shenzhen, Guangdong, China
| | - Meiling She
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, Guangdong, China
| | - Xingduo Dong
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, New York, USA
| | - Jun Chen
- Department of Thyroid and Breast Surgery, Shenzhen Hospital of Southern Medical University, Shenzhen, Guangdong, China
| | - Qingquan Xiong
- Department of Thyroid and Breast Surgery, Shenzhen Hospital of Southern Medical University, Shenzhen, Guangdong, China
| | - Guobin Qiu
- Department of Thyroid and Breast Surgery, Shenzhen Hospital of Southern Medical University, Shenzhen, Guangdong, China
| | - Shuyi Yang
- Department of Thyroid and Breast Surgery, Shenzhen Hospital of Southern Medical University, Shenzhen, Guangdong, China
| | - Xiangqi Li
- Department of Breast Surgery, The Second Affiliated Hospital of Shandong First Medical University, Tai'an, Shandong, China
| | - Guanghui Ren
- Department of Thyroid and Breast Surgery, Shenzhen Hospital of Southern Medical University, Shenzhen, Guangdong, China
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2
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Sun Y, Wu T, Gu J. An emerging role of N-glycosylation in cancer chemoresistance. Carbohydr Res 2024; 539:109107. [PMID: 38613897 DOI: 10.1016/j.carres.2024.109107] [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: 02/21/2024] [Revised: 04/03/2024] [Accepted: 04/03/2024] [Indexed: 04/15/2024]
Abstract
Chemoresistance poses a significant obstacle in the effective treatment of cancer, limiting the success of chemotherapy regimens. N-glycosylation, the most important post-translational modification (PTM), plays multifaceted roles in the intricate landscape of cancer progression, particularly drug resistance in cancer cells. This review explores the complex relationship between N-glycosylation and chemoresistance in cancer. Altered glycosylation patterns have been proven to impact drug efflux mechanisms in cancer cells, which can further influence the intracellular concentration of chemotherapy drugs. Moreover, N-glycosylation also plays a regulatory role in cell signaling pathways and apoptosis regulators, continuously affecting the stemness and survival of cancer cells under the selective pressure of chemotherapy. Additionally, the impact of the tumor microenvironment on glycosylation patterns adds complexity to this interplay. This review discusses current research findings, challenges, and future directions based on the roles of N-glycosylation in cancer chemoresistance, emphasizing the potential for targeted therapeutic interventions to enhance the effectiveness of chemotherapy and improve patient outcomes.
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Affiliation(s)
- Yuhan Sun
- Division of Regulatory Glycobiology, Institute of Molecular Biomembrane and Glycobiology, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aobaku, Sendai, Miyagi, 981-8558, Japan.
| | - Tiangui Wu
- Division of Regulatory Glycobiology, Institute of Molecular Biomembrane and Glycobiology, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aobaku, Sendai, Miyagi, 981-8558, Japan
| | - Jianguo Gu
- Division of Regulatory Glycobiology, Institute of Molecular Biomembrane and Glycobiology, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aobaku, Sendai, Miyagi, 981-8558, Japan.
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3
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Liao HX, Bando K, Li M, Fujita K. Multifocal Raman Spectrophotometer for Examining Drug-Induced and Chemical-Induced Cellular Changes in 3D Cell Spheroids. Anal Chem 2023; 95:14616-14623. [PMID: 37725051 DOI: 10.1021/acs.analchem.3c02129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/21/2023]
Abstract
Cell spheroids offer alternative in vitro cell models to monolayer cultured cells because they express complexities similar to those of in vivo tissues, such as cellular responses to drugs and chemicals. Raman spectroscopy emerged as a powerful analytical tool for detecting chemical changes in living cells because it nondestructively provides vibrational information regarding a target. Although multiple iterations are required in drug screening to determine drugs to treat cell spheroids and assess the inter-spheroid heterogeneity, current Raman applications used in spheroids analysis allow the observation of only a few spheroids owing to the low throughput of Raman spectroscopy. In this study, we developed a multifocal Raman spectrophotometer that enables simultaneous analysis of multiple spheroids in separate wells of a regular 96-well plate. By utilizing 96 focal spots excitation and parallel signal collection, our system can improve the throughput by approximately 2 orders of magnitude compared to a conventional single-focus Raman microscope. The Raman spectra of HeLa cell spheroids treated with anticancer drugs and HepG2 cell spheroids treated with free fatty acids were measured simultaneously, and concentration-dependent cellular responses were observed in both studies. Using the multifocal Raman spectrophotometer, we rapidly observed chemical changes in spheroids, and thus, this system can facilitate the application of Raman spectroscopy in analyzing the cellular responses of spheroids.
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Affiliation(s)
- Hao-Xiang Liao
- Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
| | - Kazuki Bando
- Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
- AIST Advanced Photonics and Biosensing Open Innovation Laboratory, Suita, Osaka 565-0871, Japan
| | - Menglu Li
- Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
- AIST Advanced Photonics and Biosensing Open Innovation Laboratory, Suita, Osaka 565-0871, Japan
| | - Katsumasa Fujita
- Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
- AIST Advanced Photonics and Biosensing Open Innovation Laboratory, Suita, Osaka 565-0871, Japan
- Institute for Open and Transdisciplinary Research Initiatives, Suita, Osaka 565-0871, Japan
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4
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Pompili S, Vetuschi A, Sferra R, Cappariello A. Extracellular Vesicles and Resistance to Anticancer Drugs: A Tumor Skeleton Key for Unhinging Chemotherapies. Front Oncol 2022; 12:933675. [PMID: 35814444 PMCID: PMC9259994 DOI: 10.3389/fonc.2022.933675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Accepted: 05/20/2022] [Indexed: 11/13/2022] Open
Abstract
Although surgical procedures and clinical care allow reaching high success in fighting most tumors, cancer is still a formidable foe. Recurrence and metastatization dampen the patients’ overall survival after the first diagnosis; nevertheless, the large knowledge of the molecular bases drives these aspects. Chemoresistance is tightly linked to these features and is mainly responsible for the failure of cancer eradication, leaving patients without a crucial medical strategy. Many pathways have been elucidated to trigger insensitiveness to drugs, generally associated with the promotion of tumor growth, aggressiveness, and metastatisation. The main mechanisms reported are the expression of transporter proteins, the induction or mutations of oncogenes and transcription factors, the alteration in genomic or mitochondrial DNA, the triggering of autophagy or epithelial-to-mesenchymal transition, the acquisition of a stem phenotype, and the activation of tumor microenvironment cells. Extracellular vesicles (EVs) can directly transfer or epigenetically induce to a target cell the molecular machinery responsible for the acquisition of resistance to drugs. In this review, we resume the main body of knowledge supporting the crucial role of EVs in the context of chemoresistance, with a particular emphasis on the mechanisms related to some of the main drugs used to fight cancer.
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Serra M, Hattinger CM, Pasello M, Casotti C, Fantoni L, Riganti C, Manara MC. Impact of ABC Transporters in Osteosarcoma and Ewing's Sarcoma: Which Are Involved in Chemoresistance and Which Are Not? Cells 2021; 10:cells10092461. [PMID: 34572110 PMCID: PMC8467338 DOI: 10.3390/cells10092461] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 09/14/2021] [Accepted: 09/15/2021] [Indexed: 12/16/2022] Open
Abstract
The ATP-binding cassette (ABC) transporter superfamily consists of several proteins with a wide repertoire of functions. Under physiological conditions, ABC transporters are involved in cellular trafficking of hormones, lipids, ions, xenobiotics, and several other molecules, including a broad spectrum of chemical substrates and chemotherapeutic drugs. In cancers, ABC transporters have been intensely studied over the past decades, mostly for their involvement in the multidrug resistance (MDR) phenotype. This review provides an overview of ABC transporters, both related and unrelated to MDR, which have been studied in osteosarcoma and Ewing's sarcoma. Since different backbone drugs used in first-line or rescue chemotherapy for these two rare bone sarcomas are substrates of ABC transporters, this review particularly focused on studies that have provided findings that have been either translated to clinical practice or have indicated new candidate therapeutic targets; however, findings obtained from ABC transporters that were not directly involved in drug resistance were also discussed, in order to provide a more complete overview of the biological impacts of these molecules in osteosarcoma and Ewing's sarcoma. Finally, therapeutic strategies and agents aimed to circumvent ABC-mediated chemoresistance were discussed to provide future perspectives about possible treatment improvements of these neoplasms.
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Affiliation(s)
- Massimo Serra
- Laboratory of Experimental Oncology, IRCCS Istituto Ortopedico Rizzoli, Via di Barbiano 1/10, 40136 Bologna, Italy; (C.M.H.); (M.P.); (C.C.); (L.F.); (M.C.M.)
- Correspondence: ; Tel.: +39-051-6366762
| | - Claudia Maria Hattinger
- Laboratory of Experimental Oncology, IRCCS Istituto Ortopedico Rizzoli, Via di Barbiano 1/10, 40136 Bologna, Italy; (C.M.H.); (M.P.); (C.C.); (L.F.); (M.C.M.)
| | - Michela Pasello
- Laboratory of Experimental Oncology, IRCCS Istituto Ortopedico Rizzoli, Via di Barbiano 1/10, 40136 Bologna, Italy; (C.M.H.); (M.P.); (C.C.); (L.F.); (M.C.M.)
| | - Chiara Casotti
- Laboratory of Experimental Oncology, IRCCS Istituto Ortopedico Rizzoli, Via di Barbiano 1/10, 40136 Bologna, Italy; (C.M.H.); (M.P.); (C.C.); (L.F.); (M.C.M.)
| | - Leonardo Fantoni
- Laboratory of Experimental Oncology, IRCCS Istituto Ortopedico Rizzoli, Via di Barbiano 1/10, 40136 Bologna, Italy; (C.M.H.); (M.P.); (C.C.); (L.F.); (M.C.M.)
| | - Chiara Riganti
- Department of Oncology, University of Torino, Via Santena 5/bis, 10126 Torino, Italy;
| | - Maria Cristina Manara
- Laboratory of Experimental Oncology, IRCCS Istituto Ortopedico Rizzoli, Via di Barbiano 1/10, 40136 Bologna, Italy; (C.M.H.); (M.P.); (C.C.); (L.F.); (M.C.M.)
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6
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Zou T, Zeng C, Qu J, Yan X, Lin Z. Rutaecarpine Increases Anticancer Drug Sensitivity in Drug-Resistant Cells through MARCH8-Dependent ABCB1 Degradation. Biomedicines 2021; 9:1143. [PMID: 34572328 PMCID: PMC8466742 DOI: 10.3390/biomedicines9091143] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 08/28/2021] [Accepted: 08/30/2021] [Indexed: 12/24/2022] Open
Abstract
The overexpression of adenosine triphosphate (ATP)-binding cassette (ABC) subfamily B member 1 (ABCB1; P-glycoprotein; MDR1) in some types of cancer cells is one of the mechanisms responsible for the development of multidrug resistance (MDR), which leads to the failure of chemotherapy. Therefore, it is important to inhibit the activity or reduce the expression level of ABCB1 to maintain an effective intracellular level of chemotherapeutic drugs. In this study, we found that rutaecarpine, a bioactive alkaloid isolated from Evodia Rutaecarpa, has the capacity to reverse ABCB1-mediated MDR. Our data indicated that the reversal effect of rutaecarpine was related to the attenuation of the protein level of ABCB1. Mechanistically, we demonstrated that ABCB1 is a newly discovered substrate of E3 ubiquitin ligase membrane-associated RING-CH 8 (MARCH8). MARCH8 can interact with ABCB1 and promote its ubiquitination and degradation. In short, rutaecarpine increased the degradation of ABCB1 protein by upregulating the protein level of MARCH8, thereby antagonizing ABCB1-mediated MDR. Notably, the treatment of rutaecarpine combined with other anticancer drugs exhibits a therapeutic effect on transplanted tumors. Therefore, our study provides a potential chemotherapeutic strategy of co-administrating rutaecarpine with other conventional chemotherapeutic agents to overcome MDR and improve therapeutic effect.
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Affiliation(s)
- Tingting Zou
- School of Life Sciences, Chongqing University, Chongqing 401331, China; (T.Z.); (C.Z.); (J.Q.)
| | - Cheng Zeng
- School of Life Sciences, Chongqing University, Chongqing 401331, China; (T.Z.); (C.Z.); (J.Q.)
| | - Junyan Qu
- School of Life Sciences, Chongqing University, Chongqing 401331, China; (T.Z.); (C.Z.); (J.Q.)
| | - Xiaohua Yan
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Nanchang University, Nanchang 330006, China
| | - Zhenghong Lin
- School of Life Sciences, Chongqing University, Chongqing 401331, China; (T.Z.); (C.Z.); (J.Q.)
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7
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Li B, Cui Y, Wang X, Tang R. Novel nanomaterial-organism hybrids with biomedical potential. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2021; 13:e1706. [PMID: 33644977 DOI: 10.1002/wnan.1706] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 01/20/2021] [Accepted: 01/21/2021] [Indexed: 12/29/2022]
Abstract
Instinctive hierarchically biomineralized structures of various organisms, such as eggs, algae, and magnetotactic bacteria, afford extra protection and distinct performance, which endow fragile organisms with a tenacious ability to adapt and survive. However, spontaneous formation of hybrid materials is difficult for most organisms in nature. Rapid development of chemistry and materials science successfully obtained the combinations of organisms with nanomaterials by biomimetic mineralization thus demonstrating the reproduction of the structures and functions and generation of novel functions that organisms do not possess. The rational design of biomaterial-organism hybridization can control biological recognition, interactions, and metabolism of the organisms. Thus, nanomaterial-organism hybrids represent a next generation of organism engineering with great potential biomedical applications. This review summarizes recent advances in material-directed organism engineering and is mainly focused on biomimetic mineralization technologies and their outstanding biomedical applications. Three representative types of biomimetic mineralization are systematically introduced, including external mineralization, internal mineralization, and genetic engineering mineralization. The methods involving hybridization of nanomaterials and organisms based on biomimetic mineralization strategies are described. These strategies resulted in applications of various nanomaterial-organism hybrids with multiplex functions in cell engineering, cancer treatment, and vaccine improvement. Unlike classical biological approaches, this material-based bioregulation is universal, effective, and inexpensive. In particular, instead of traditional medical solutions, the integration of nanomaterials and organisms may exploit novel strategies to solve current biomedical problems. This article is categorized under: Implantable Materials and Surgical Technologies > Nanomaterials and Implants Therapeutic Approaches and Drug Discovery > Nanomedicine for Oncologic Disease Therapeutic Approaches and Drug Discovery > Nanomedicine for Infectious Disease.
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Affiliation(s)
- Benke Li
- Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang, China
| | - Yihao Cui
- Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang, China
| | - Xiaoyu Wang
- Qiushi Academy for Advanced Studies, Zhejiang University, Hangzhou, Zhejiang, China
| | - Ruikang Tang
- Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang, China.,Qiushi Academy for Advanced Studies, Zhejiang University, Hangzhou, Zhejiang, China
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8
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Haque A, Sait KHW, Alam Q, Alam MZ, Anfinan N, Wali AWN, Rasool M. MDR1 Gene Polymorphisms and Its Association With Expression as a Clinical Relevance in Terms of Response to Chemotherapy and Prognosis in Ovarian Cancer. Front Genet 2020; 11:516. [PMID: 32528530 PMCID: PMC7264409 DOI: 10.3389/fgene.2020.00516] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Accepted: 04/28/2020] [Indexed: 01/17/2023] Open
Abstract
In spite of the significant advancements in the treatment modalities, 30% of advanced stage ovarian cancer (OC) patients do not respond to the standard chemotherapeutic regimen and most of the responders finally relapse over time due to the escalation of multidrug resistance (MDR) Phenomenon. Our present study evaluated chemotherapeutic sensitivity response among 47 ovarian tumor patients of which we found 37 (78.8%) sensitive and remaining 10 (21.2%) resistant. Among the resistant, seven tumor samples were found to be platinum resistant or refractory to platinum (CB/TX), one to carboplatin, and two to 5FU. Notably, all these resistant cases were observed in the disease recurrence group of patients identified at stage III or IV. The stage III resistant cases revealed heterozygous mutation (C/T) in exon 12 (C1236T) and 26 (C3435T) and increased level of mRNA, whereas homozygous mutation (T/T) was found at stage IV tumor patients. The genotypic difference was found to be significant (p = 0.03) for exon 12, and p = 0.003 for exon 26 mutant genotypes. No significant association between genotypes of different exons with tumor stages and tumor grade was observed (p > 0.05). However, a significant association was observed between the genotype of exon-12 and histopathology of tumor tissue (p = 0.028). Statistically, the chemotherapy response was found to be significantly associated with the tumor stage (p = 0.019). We also observed a significant difference in PFS (P = 0.019) and OS (P = 0.047) between tumor grades 1 and 3. Notably, the highest mRNA expression was observed in resistant tumor sample T-32, where interestingly we found homozygosity TT in all of the exons 12, 21, and 26. Thus, we suggest that exons 12 (C1236T) and exon 26 (C3435T) polymorphism may play a role in inducing drug resistance by altering the expression level of the MDR1 gene. To summarize, we suggest that the expression of MDR1 in OC is influenced by tumor stage and genotype variants as well as by chemotherapeutic drugs. Thus our findings suggest that inter individual variability in platinum based therapy may be anticipated by MDR1 genotypes. Further studies on a large number of samples shall eventually lead to provide beneficial information for the individualized chemotherapy.
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Affiliation(s)
- Absarul Haque
- King Fahd Medical Research Center, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia.,Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Khalid Hussain Wali Sait
- Gynecology Oncology Unit, Department of Obstetrics and Gynecology, Faculty of Medicine, King Abdulaziz University Hospital, Jeddah, Saudi Arabia
| | - Qamre Alam
- King Fahd Medical Research Center, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia.,Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Mohammad Zubair Alam
- King Fahd Medical Research Center, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia.,Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Nisreen Anfinan
- Gynecology Oncology Unit, Department of Obstetrics and Gynecology, Faculty of Medicine, King Abdulaziz University Hospital, Jeddah, Saudi Arabia
| | - Abdul Wahab Noor Wali
- King Fahd Medical Research Center, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia.,Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Mahmood Rasool
- Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia.,Center of Excellence in Genomic Medicine Research, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
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9
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Human cytomegalovirus promoting endothelial cell proliferation by targeting regulator of G-protein signaling 5 hypermethylation and downregulation. Sci Rep 2020; 10:2252. [PMID: 32041970 PMCID: PMC7010708 DOI: 10.1038/s41598-020-58680-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 01/15/2020] [Indexed: 01/21/2023] Open
Abstract
Interactions between human cytomegalovirus (HCMV) infection and environmental factors can increase susceptibility to essential hypertension (EH). Although endothelial dysfunction is the initial factor of EH, the epigenetic mechanisms through which HCMV infection induces endothelial cell dysfunction are poorly understood. Here, we evaluated whether HCMV regulated endothelial cell function and assessed the underlying mechanisms. Microarray analysis in human umbilical vein endothelial cells (HUVECs) treated with HCMV AD169 strain in the presence of hyperglycemia and hyperlipidemia revealed differential expression of genes involved in hypertension. Further analyses validated that the regulator of G-protein signaling 5 (RGS5) gene was downregulated in infected HUVECs and showed that HCMV infection promoted HUVEC proliferation, whereas hyperglycemia and hyperlipidemia inhibited HUVEC proliferation. Additionally, treatment with decitabine (DAC) and RGS5 reversed the effects of HCMV infection on HUVEC proliferation, but not triggered by hyperglycemia and hyperlipidemia. In summary, upregulation of RGS5 may be a promising treatment for preventing HCMV-induced hypertension.
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Talukdar S, Das SK, Pradhan AK, Emdad L, Windle JJ, Sarkar D, Fisher PB. MDA-9/Syntenin (SDCBP) Is a Critical Regulator of Chemoresistance, Survival and Stemness in Prostate Cancer Stem Cells. Cancers (Basel) 2019; 12:cancers12010053. [PMID: 31878027 PMCID: PMC7017101 DOI: 10.3390/cancers12010053] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Revised: 12/13/2019] [Accepted: 12/17/2019] [Indexed: 12/20/2022] Open
Abstract
Despite some progress, treating advanced prostate cancer remains a major clinical challenge. Recent studies have shown that prostate cancer can originate from undifferentiated, rare, stem cell-like populations within the heterogeneous tumor mass, which play seminal roles in tumor formation, maintenance of tumor homeostasis and initiation of metastases. These cells possess enhanced propensity toward chemoresistance and may serve as a prognostic factor for prostate cancer recurrence. Despite extensive studies, selective targeted therapies against these stem cell-like populations are limited and more detailed experiments are required to develop novel targeted therapeutics. We now show that MDA-9/Syntenin/SDCBP (MDA-9) is a critical regulator of survival, stemness and chemoresistance in prostate cancer stem cells (PCSCs). MDA-9 regulates the expression of multiple stem-regulatory genes and loss of MDA-9 causes a complete collapse of the stem-regulatory network in PCSCs. Loss of MDA-9 also sensitizes PCSCs to multiple chemotherapeutics with different modes of action, such as docetaxel and trichostatin-A, suggesting that MDA-9 may regulate multiple drug resistance. Mechanistically, MDA-9-mediated multiple drug resistance, stemness and survival are regulated in PCSCs through activation of STAT3. Activated STAT3 regulates chemoresistance in PCSCs through protective autophagy as well as regulation of MDR1 on the surface of the PCSCs. We now demonstrate that MDA-9 is a critical regulator of PCSC survival and stemness via exploiting the inter-connected STAT3 and c-myc pathways.
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Affiliation(s)
- Sarmistha Talukdar
- Department of Human and Molecular Genetics, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA; (S.T.); (S.K.D.); (A.K.P.); (L.E.); (J.J.W.); (D.S.)
- VCU Institute of Molecular Medicine, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Swadesh K. Das
- Department of Human and Molecular Genetics, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA; (S.T.); (S.K.D.); (A.K.P.); (L.E.); (J.J.W.); (D.S.)
- VCU Institute of Molecular Medicine, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA
- VCU Massey Cancer Center, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Anjan K. Pradhan
- Department of Human and Molecular Genetics, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA; (S.T.); (S.K.D.); (A.K.P.); (L.E.); (J.J.W.); (D.S.)
- VCU Institute of Molecular Medicine, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Luni Emdad
- Department of Human and Molecular Genetics, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA; (S.T.); (S.K.D.); (A.K.P.); (L.E.); (J.J.W.); (D.S.)
- VCU Institute of Molecular Medicine, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA
- VCU Massey Cancer Center, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Jolene J. Windle
- Department of Human and Molecular Genetics, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA; (S.T.); (S.K.D.); (A.K.P.); (L.E.); (J.J.W.); (D.S.)
- VCU Institute of Molecular Medicine, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA
- VCU Massey Cancer Center, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Devanand Sarkar
- Department of Human and Molecular Genetics, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA; (S.T.); (S.K.D.); (A.K.P.); (L.E.); (J.J.W.); (D.S.)
- VCU Institute of Molecular Medicine, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA
- VCU Massey Cancer Center, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Paul B. Fisher
- Department of Human and Molecular Genetics, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA; (S.T.); (S.K.D.); (A.K.P.); (L.E.); (J.J.W.); (D.S.)
- VCU Institute of Molecular Medicine, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA
- VCU Massey Cancer Center, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA
- Correspondence: ; Tel.: +1-804-628-3506 or +1-804-628-3336; Fax: +1-804-827-1124
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11
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Zaghloul Y, Sayed R, Abdallah R. Study the impact of gamma irradiation on the vitellogenin gene in Galleria mellonella females by using the comparative CT method. JOURNAL OF RADIATION RESEARCH AND APPLIED SCIENCES 2019. [DOI: 10.1016/j.jrras.2017.04.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Y.S. Zaghloul
- Natural Products Department, National Center for Radiation Research and Technology, Cairo, Egypt
| | - R.M. Sayed
- Natural Products Department, National Center for Radiation Research and Technology, Cairo, Egypt
| | - R.S. Abdallah
- Natural Products Department, National Center for Radiation Research and Technology, Cairo, Egypt
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12
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Mlejnek P, Frydrych I, Dolezel P. Cyclosporin a Potentiates the Cytotoxic Effects of Methyl Methanesulphonate in HL-60 and K562 Cells. Altern Lab Anim 2019; 35:79-85. [PMID: 17411355 DOI: 10.1177/026119290703500117] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Methyl methanesulphonate (MMS) is a DNA damaging agent, which induces oxidative stress, ATP depletion, and consequently, cell death, in HL-60 and K562 cells. The cell death induced by MMS predominantly exhibited the morphological and biochemical hallmarks of necrosis. A minor population of dying cells exhibited apoptotic hallmarks, especially in K562 cell cultures. Cyclosporin A (CsA) was used to modulate the MMS-induced cell death. Our results indicated that CsA did not prevent cells from dying, but changed the mode of death from necrotic to apoptotic. Surprisingly, CsA enhanced oxidative stress and increased the overall number of dead cells. Based on these results, we conclude that the modulatory effect of CsA on MMS-induced cell death might arise from an interference by CsA with mitochondrial metabolism, rather than from inhibition of the MMS efflux mediated by P-glycoprotein.
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Affiliation(s)
- Petr Mlejnek
- Department of Biology, Faculty of Medicine, Palacky University, Olomouc, Czech Republic.
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13
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Waghray D, Zhang Q. Inhibit or Evade Multidrug Resistance P-Glycoprotein in Cancer Treatment. J Med Chem 2017; 61:5108-5121. [PMID: 29251920 DOI: 10.1021/acs.jmedchem.7b01457] [Citation(s) in RCA: 250] [Impact Index Per Article: 35.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Multidrug resistance (MDR) is a major cause of failure in cancer chemotherapy. P-glycoprotein (P-gp), a promiscuous drug efflux pump, has been extensively studied for its association with MDR due to overexpression in cancer cells. Several P-gp inhibitors or modulators have been investigated in clinical trials in hope of circumventing MDR, with only limited success. Alternative strategies are actively pursued, such as the modification of existing drugs, development of new drugs, or combination of novel drug delivery agents to evade P-gp-dependent efflux. Despite the importance and numerous studies, these efforts have mostly been undertaken without a priori knowledge of how drugs interact with P-gp at the molecular level. This review highlights and discusses progress toward and challenges impeding drug development for inhibiting or evading P-gp in the context of our improved understanding of the structural basis and mechanism of P-gp-mediated MDR.
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Affiliation(s)
- Deepali Waghray
- Department of Integrative Structural and Computational Biology , The Scripps Research Institute , La Jolla , California 92037 , United States
| | - Qinghai Zhang
- Department of Integrative Structural and Computational Biology , The Scripps Research Institute , La Jolla , California 92037 , United States
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14
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Wang D, Xu X, Zhang K, Sun B, Wang L, Meng L, Liu Q, Zheng C, Yang B, Sun H. Codelivery of doxorubicin and MDR1-siRNA by mesoporous silica nanoparticles-polymerpolyethylenimine to improve oral squamous carcinoma treatment. Int J Nanomedicine 2017; 13:187-198. [PMID: 29343957 PMCID: PMC5749394 DOI: 10.2147/ijn.s150610] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Oral cancer is a type of head and neck cancer that is the seventh most frequent cancer and the ninth most frequent cause of death globally. About 90% of oral cancer is of squamous cell carcinoma type. Surgery and radiation with and without chemotherapy are the major treatments for oral cancer. Better advanced treatment is still needed. Multidrug resistance plays an important role in failure of oral cancer chemotherapy. In this study, we tried to fabricate a novel nanoparticle that could carry both MDR1-siRNA to block MDR1 expression and doxorubicin (DOX), a chemotherapy drug, into cancer cells in order to directly kill the cells with little or no effect of multidrug resistance. Results showed that mesoporous silica nanoparticles (MSNP) can be modified by cationic polymerpolyethylenimine (PEI) to obtain positive charges on the surface, which could enable the MSNP to carry MDR1-siRNA and DOX. The transfection efficiency assays demonstrated that the MSNP-PEI-DOX/ MDR1-siRNA was efficiently transfected into KBV cells in vitro. KBV cells transfected with MSNP-PEI-DOX/MDR1-siRNA could effectively decrease gene expression of MDR1 (~70% increase after 72 hours posttreatment) and induce the apoptosis of KBV cells (24.27% after 48 hours posttreatment) in vitro. Importantly, MSNP-PEI-DOX/MDR1-siRNA dramatically reduced the tumor size (81.64% decrease after 28 days posttreatment) and slowed down tumor growth rate compared to the control group in vivo (P<0.05). In the aggregate, newly synthesized MSNP-PEI-DOX/MDR1-siRNA improves cancer chemotherapy effect in terms of treating multidrug-resistant cancer compared to DOX only, clearly demonstrating that MSNP-PEI-DOX/MDR1-siRNA has potential therapeutic application for multidrug-resistant cancer in the future.
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Affiliation(s)
- Dandan Wang
- Department of Pathology, School and Hospital of Stomatology, Jilin University, Changchun, People's Republic of China
| | - Xiaowei Xu
- Department of Periodontology, School and Hospital of Stomatology, Jilin University, Changchun, People's Republic of China
| | - Kai Zhang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, People's Republic of China
| | - Bin Sun
- Department of Oral and Maxilloficial Syrgery, School and Hospital of Stomatology, Jilin University, Changchun, People's Republic of China
| | - Lu Wang
- Department of Pathology, School and Hospital of Stomatology, Jilin University, Changchun, People's Republic of China
| | - Lin Meng
- Department of Pathology, School and Hospital of Stomatology, Jilin University, Changchun, People's Republic of China
| | - Qilin Liu
- Department of Oral and Maxilloficial Syrgery, School and Hospital of Stomatology, Jilin University, Changchun, People's Republic of China
| | - Changyu Zheng
- Molecular Physiology and Therapeutics Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD, USA
| | - Bai Yang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, People's Republic of China
| | - Hongchen Sun
- Department of Pathology, School and Hospital of Stomatology, Jilin University, Changchun, People's Republic of China.,State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, People's Republic of China.,Key Laboratory of Science and Technology for Stomatology Nanoengineering, The Education Department of Jilin Province, Changchun, People's Republic of China
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15
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Shigemasa K, Tanimoto H, Parham GP, Parmley TH, Ohama K, O'Brien TJ. Cyclin D1 Overexpression and p53 Mutation Status in Epithelial Ovarian Cancer. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/107155769900600209] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
| | | | | | | | - Koso Ohama
- Department of Obstetrics and Gynecology, Hiroshima University School of Medicine, Hiroshima, Japan and Departments of Obstetrics and Gynecology and Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Timothy J. O'Brien
- Department of Obstetrics and Gynecology, Biomedical Biotechnology Center, 4301 West Markham Street, Slot 718, Little Rock, AR 72205
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16
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Tashbaeva RE, Hwang DN, Song GS, Choi NH, Lee JH, Lyoo YS, Lee SJ, Jung DI, Kim HY, Sur JH. Cellular Characterization of Multidrug Resistance P-glycoprotein, Alpha Fetoprotein, and Neovascular Endothelium-Associated Antigens in Canine Hepatocellular Carcinoma and Cirrhotic Liver. Vet Pathol 2016; 44:600-6. [PMID: 17846232 DOI: 10.1354/vp.44-5-600] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
P-glycoprotein (P-gp), which is encoded by the multidrug resistance gene (MDR-1); alpha fetoprotein (AFP); and vascular endothelium-associated antigens are well-known markers for human and canine hepatic diseases. We obtained liver tissues from 5 dogs with hepatocellular carcinoma (HCC) and 12 dogs with cirrhosis, and we performed histopathologic and immunohistochemical evaluations using anti-P-gp, anti-AFP, anti-CD31, and anti-CD34 antibodies. P-gp was expressed at higher levels in HCC than in cirrhotic livers ( P < .01), and was most commonly localized in biliary canaliculi and small ductuli. AFP was localized mainly in the cytoplasm in HCC ( P < .01) and in a few cases of cirrhosis. In both HCC and cirrhosis, the AFP-positive cells were morphologically similar to normal hepatocytes and showed an even cytoplasmic distribution of AFP. The endothelial markers CD31 and CD34 were used to investigate vascular distribution. CD31 was expressed strongly in the portal area and parenchyma in HCC, but it was rarely observed in the parenchyma in cirrhosis. CD34 expression could not be detected in both HCC and cirrhosis. This study constitutes the first comprehensive study of P-gp, AFP, and endothelial markers in canine HCC and cirrhosis. The importance of these markers in HCC and cirrhosis in dogs was demonstrated and provides a more accurate basis for a definitive diagnosis of HCC and cirrhosis in dogs.
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Affiliation(s)
- R E Tashbaeva
- Department of Veterinary Pathobiology, College of Veterinary Medicine, Konkuk University, Hwayang-dong 1, KwangJin-Ku, Seoul 143-701, Korea
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17
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Cinatl J, Gröschel B, Zehner R, Cinatl J, Périgaud C, Gosselin G, Imbach JL, Doerr HW. Human Immunodeficiency Virus Resistance to AZT in MOLT4/8 Cells is Associated with a Lack of AZT Phosphorylation and is Bypassed by AZT-Monophosphate SATE Prodrugs. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/095632029700800407] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Human T lymphoid MOLT4/8 cells were grown continuously for more than 2 years in a medium containing 3′-azido-2′,3′-dideoxythymidine (zidovudine; AZT) at a concentration of 250 μM. These cells, designated MOLT-4/8rAZT250, were used to test the cytotoxic and antiviral activity of AZT. Intracellular accumulation of AZT, expression of the multidrug resistance 1 (MDR-1) gene, thymidine kinase (TK) gene and activity of the TK enzyme in cellular extracts were measured. The results showed that both the cytotoxic and antiviral activity of AZT were significantly lower in MOLT4/8rAZT250 than in MOLT4/8 cells; concentrations required to inhibit 50% production of the p24 human immunodeficiency virus type 1 (HIV-1) antigen of two laboratory strains were at least 100-fold higher in resistant cells. The MDR-1 gene was not expressed in the resistant cells. TK mRNA expression was significantly lower in the resistant than in the sensitive cells. TK enzymatic activity for deoxythymidine phosphorylation was impaired in MOLT4/8rAZT250 cells compared to the sensitive cells. AZT was phosphorylated only in the sensitive cells whereas no phosphorylation of AZT was found in the resistant cells. We tested whether several AZT-monophosphate triesters, which bypass cellular TK, could overcome resistance to the cytotoxic and antiviral activity of AZT. The bis( t-butylSATE) phosphotriester derivative of AZT showed comparable cytotoxic and antiviral activity in sensitive and resistant cells. The results demonstrated that MOLT4/8rAZT250 cells exert resistance to the anti-HIV activity of the drug mainly owing to the lack of AZT phosphorylation and that resistance may be bypassed by using AZT-monophosphate SATE prodrugs.
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Affiliation(s)
- J Cinatl
- Institut für Medizinische Virologie, Universitätsklinikum, JW Goethe-Universität, Paul-Ehrlich-Strasse 40, D-60596 Frankfurt am Main, Germany
| | - B Gröschel
- Institut für Medizinische Virologie, Universitätsklinikum, JW Goethe-Universität, Paul-Ehrlich-Strasse 40, D-60596 Frankfurt am Main, Germany
| | - R Zehner
- Zentrum der Rechfsmedizin, Universitätsklinikum, JW Goethe-Universität, Kennedyallee 104, D-60596 Frankfurt am Main, Germany
| | - J Cinatl
- Institut für Medizinische Virologie, Universitätsklinikum, JW Goethe-Universität, Paul-Ehrlich-Strasse 40, D-60596 Frankfurt am Main, Germany
- Zentrum für Kinderheilkunde, Abteilung Hämatologie und Onkologie, Universitätsklinikum, JW Goethe-Universität, Theodor-Stern-Kai 7, D-60596 Frankfurt am Main, Germany
| | - C Périgaud
- Laboratoire de Chimie Bioorganique, UMR CNRS 5625, Case Courrier 008, Université Montpellier II, Sciences et Techniques du Languedoc, Place Eugène Bataillon, 34095 Montpellier, France
| | - G Gosselin
- Laboratoire de Chimie Bioorganique, UMR CNRS 5625, Case Courrier 008, Université Montpellier II, Sciences et Techniques du Languedoc, Place Eugène Bataillon, 34095 Montpellier, France
| | - J-L Imbach
- Laboratoire de Chimie Bioorganique, UMR CNRS 5625, Case Courrier 008, Université Montpellier II, Sciences et Techniques du Languedoc, Place Eugène Bataillon, 34095 Montpellier, France
| | - HW Doerr
- Institut für Medizinische Virologie, Universitätsklinikum, JW Goethe-Universität, Paul-Ehrlich-Strasse 40, D-60596 Frankfurt am Main, Germany
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18
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Sevelda F, Mayr L, Kubista B, Lötsch D, van Schoonhoven S, Windhager R, Pirker C, Micksche M, Berger W. EGFR is not a major driver for osteosarcoma cell growth in vitro but contributes to starvation and chemotherapy resistance. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2015; 34:134. [PMID: 26526352 PMCID: PMC4630894 DOI: 10.1186/s13046-015-0251-5] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Accepted: 10/23/2015] [Indexed: 11/28/2022]
Abstract
Background Enhanced signalling via the epidermal growth factor receptor (EGFR) is a hallmark of multiple human carcinomas. However, in recent years data have accumulated that EGFR might also be hyperactivated in human sarcomas. Aim of this study was to investigate the influence of EGFR inhibition on cell viability and its interaction with chemotherapy response in osteosarcoma cell lines. Methods We have investigated a panel of human osteosarcoma cell lines regarding EGFR expression and downstream signalling. To test its potential applicability as therapeutic target, inhibition of EGFR by gefitinib was combined with osteosarcoma chemotherapeutics and cell viability, migration, and cell death assays were performed. Results Osteosarcoma cells expressed distinctly differing levels of functional EGFR reaching in some cases high amounts. Functionality of EGFR in osteosarcoma cells was proven by EGF-mediated activation of both MAPK and PI3K/AKT pathway (determined by phosphorylation of ERK1/2, AKT, S6, and GSK3β). The EGFR-specific inhibitor gefitinib blocked EGF-mediated downstream signal activation. At standard in vitro culture conditions, clinically achievable gefitinib doses demonstrated only limited cytotoxic activity, however, significantly reduced long-term colony formation and cell migration. In contrast, under serum-starvation conditions active gefitinib doses were distinctly reduced while EGF promoted starvation survival. Importantly, gefitinib significantly supported the anti-osteosarcoma activities of doxorubicin and methotrexate regarding cell survival and migratory potential. Conclusion Our data suggest that EGFR is not a major driver for osteosarcoma cell growth but contributes to starvation- and chemotherapy-induced stress survival. Consequently, combination approaches including EGFR inhibitors should be evaluated for treatment of high-grade osteosarcoma patients. Electronic supplementary material The online version of this article (doi:10.1186/s13046-015-0251-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Florian Sevelda
- Department of Orthopaedics, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria. .,Institute of Cancer Research and Comprehensive Cancer Center, Department of Medicine I, Medical University Vienna, Borschkegasse 8a, 1090, Vienna, Austria.
| | - Lisa Mayr
- Institute of Cancer Research and Comprehensive Cancer Center, Department of Medicine I, Medical University Vienna, Borschkegasse 8a, 1090, Vienna, Austria.
| | - Bernd Kubista
- Department of Orthopaedics, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria.
| | - Daniela Lötsch
- Institute of Cancer Research and Comprehensive Cancer Center, Department of Medicine I, Medical University Vienna, Borschkegasse 8a, 1090, Vienna, Austria.
| | - Sushilla van Schoonhoven
- Institute of Cancer Research and Comprehensive Cancer Center, Department of Medicine I, Medical University Vienna, Borschkegasse 8a, 1090, Vienna, Austria.
| | - Reinhard Windhager
- Department of Orthopaedics, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria.
| | - Christine Pirker
- Institute of Cancer Research and Comprehensive Cancer Center, Department of Medicine I, Medical University Vienna, Borschkegasse 8a, 1090, Vienna, Austria.
| | - Michael Micksche
- Institute of Cancer Research and Comprehensive Cancer Center, Department of Medicine I, Medical University Vienna, Borschkegasse 8a, 1090, Vienna, Austria.
| | - Walter Berger
- Institute of Cancer Research and Comprehensive Cancer Center, Department of Medicine I, Medical University Vienna, Borschkegasse 8a, 1090, Vienna, Austria.
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19
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Wang Z, Wong ILK, Li FX, Yang C, Liu Z, Jiang T, Jiang TF, Chow LMC, Wan SB. Optimization of permethyl ningalin B analogs as P-glycoprotein inhibitors. Bioorg Med Chem 2015; 23:5566-73. [PMID: 26233798 DOI: 10.1016/j.bmc.2015.07.027] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 07/14/2015] [Accepted: 07/16/2015] [Indexed: 11/16/2022]
Abstract
In the present study, a total of 9 novel permethyl ningalin B analogs have been synthesized and evaluated for their P-gp modulating activity in a P-gp overexpressed breast cancer cell line LCC6MDR. Among these derivatives, compound 12 with dimethoxy groups at rings A and B and tri-substitution at ring C with ortho-methoxyethylmorpholine, meta-bromo and para-benzyloxy groups displays the most potent P-gp modulating activity with EC50 of 423 nM to reverse paclitaxel resistance. It is non-toxic towards L929 fibroblast with IC50 greater than 100 μM and with selective index greater than 236. Its mechanism to reverse P-gp mediated drug resistance is by virtue of inhibiting transport activity of P-gp, restoring intracellular drug accumulation and eventually chemosensitizing the cancer cells to anticancer drug again. Moreover, compound 12 showed better solubility (405 ng/mL) than hit compound 1 in phosphate buffer (pH 4.0). In summary, our study demonstrates that permethyl ningalin B derivative 12 is non-toxic and efficient P-gp inhibitor that is a potential candidate to be used clinically to reverse P-gp mediated cancer drug resistance.
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Affiliation(s)
- Zhen Wang
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China; State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Iris L K Wong
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China; State Key Laboratory of Chirosciences, The Hong Kong Polytechnic University, China
| | - Fu Xing Li
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China; State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Chao Yang
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China; State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Zhen Liu
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China; State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Tao Jiang
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China
| | - Ting Fu Jiang
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China
| | - Larry M C Chow
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China; State Key Laboratory of Chirosciences, The Hong Kong Polytechnic University, China.
| | - Sheng Biao Wan
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China; State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
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20
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Chen W, Liu X, Xiao Y, Tang R. Overcoming multiple drug resistance by spatial-temporal synchronization of epirubicin and pooled siRNAs. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:1775-1781. [PMID: 25641804 DOI: 10.1002/smll.201402377] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Revised: 10/19/2014] [Indexed: 06/04/2023]
Abstract
One-pot solution mineralization can encapsulate epirubicin (EPI) and pooled siRNAs (Pgp and Bcl-2 siRNAs) in calcium phosphate (CaP). The resulting EPI-RNA-CaP nanocomplexes can achieve a spatial-temporal synchronous effect to full-scale overcome sophisticated multiple drug resistance (MDR) by simultaneous inhibitions of drug efflux and intracellular anti-apoptotic defense to maximize the therapeutic efficacy.
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Affiliation(s)
- Wei Chen
- Center for Biomaterials and Biopathways, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang, 310027, P. R. China
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21
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Martorell L, Corrales I, Ramirez L, Parra R, Raya A, Barquinero J, Vidal F. Molecular characterization of ten
F8
splicing mutations in RNA isolated from patient's leucocytes: assessment of
in silico
prediction tools accuracy. Haemophilia 2015; 21:249-257. [DOI: 10.1111/hae.12562] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/13/2014] [Indexed: 01/01/2023]
Affiliation(s)
- L. Martorell
- Gene and Cell Therapy Vall d'Hebron Research Institute Universitat Autònoma de Barcelona (VHIR‐UAB)Barcelona Spain
- Control of Stem Cell Potency Institute for Bioengineering of Catalonia (IBEC)Barcelona Spain
- Molecular Diagnosis and Therapy Vall d'Hebron Research Institute Universitat Autònoma de Barcelona (VHIR‐UAB)Barcelona Spain
| | - I. Corrales
- Molecular Diagnosis and Therapy Vall d'Hebron Research Institute Universitat Autònoma de Barcelona (VHIR‐UAB)Barcelona Spain
- Congenital Coagulopathies Laboratory Blood and Tissue Bank (BST)Barcelona Spain
| | - L. Ramirez
- Molecular Diagnosis and Therapy Vall d'Hebron Research Institute Universitat Autònoma de Barcelona (VHIR‐UAB)Barcelona Spain
- Congenital Coagulopathies Laboratory Blood and Tissue Bank (BST)Barcelona Spain
| | - R. Parra
- Congenital Coagulopathies Laboratory Blood and Tissue Bank (BST)Barcelona Spain
- Haemophilia Unit Vall d'Hebron University HospitalBarcelona Spain
| | - A. Raya
- Control of Stem Cell Potency Institute for Bioengineering of Catalonia (IBEC)Barcelona Spain
- Catalan Institution for Research and Advanced Studies (ICREA)Barcelona Spain
- Center of Regenerative Medicine in Barcelona (CMRB)Barcelona Spain
- Networking Center of Biomedical Research in Bioengineering Biomaterials and Nanomedicine (CIBER‐BBN) Barcelona Spain
| | - J. Barquinero
- Gene and Cell Therapy Vall d'Hebron Research Institute Universitat Autònoma de Barcelona (VHIR‐UAB)Barcelona Spain
| | - F. Vidal
- Molecular Diagnosis and Therapy Vall d'Hebron Research Institute Universitat Autònoma de Barcelona (VHIR‐UAB)Barcelona Spain
- Congenital Coagulopathies Laboratory Blood and Tissue Bank (BST)Barcelona Spain
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22
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Sharom FJ. Complex Interplay between the P-Glycoprotein Multidrug Efflux Pump and the Membrane: Its Role in Modulating Protein Function. Front Oncol 2014; 4:41. [PMID: 24624364 PMCID: PMC3939933 DOI: 10.3389/fonc.2014.00041] [Citation(s) in RCA: 190] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2013] [Accepted: 02/17/2014] [Indexed: 11/16/2022] Open
Abstract
Multidrug resistance in cancer is linked to expression of the P-glycoprotein multidrug transporter (Pgp, ABCB1), which exports many structurally diverse compounds from cells. Substrates first partition into the bilayer and then interact with a large flexible binding pocket within the transporter's transmembrane regions. Pgp has been described as a hydrophobic vacuum cleaner or an outwardly directed drug/lipid flippase. Recent X-ray crystal structures have shed some light on the nature of the drug-binding pocket and suggested routes by which substrates can enter it from the membrane. Detergents have profound effects on Pgp function, and several appear to be substrates. Biochemical and biophysical studies in vitro, some using purified reconstituted protein, have explored the effects of the membrane environment. They have demonstrated that Pgp is involved in a complex relationship with its lipid environment, which modulates the behavior of its substrates, as well as various functions of the protein, including ATP hydrolysis, drug binding, and drug transport. Membrane lipid composition and fluidity, phospholipid headgroup and acyl chain length all influence Pgp function. Recent studies focusing on thermodynamics and kinetics have revealed some important principles governing Pgp-lipid and substrate-lipid interactions, and how these affect drug-binding and transport. In some cells, Pgp is associated with cholesterol-rich microdomains, which may modulate its functions. The relationship between Pgp and cholesterol remains an open question; however, it clearly affects several aspects of its function in addition to substrate-membrane partitioning. The action of Pgp modulators appears to depend on their membrane permeability, and membrane fluidizers and surfactants reverse drug resistance, likely via an indirect mechanism. A detailed understanding of how the membrane affects Pgp substrates and Pgp's catalytic cycle may lead to new strategies to combat clinical drug resistance.
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Affiliation(s)
- Frances Jane Sharom
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, ON, Canada
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23
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Schelert J, Rudrappa D, Johnson T, Blum P. Role of MerH in mercury resistance in the archaeon Sulfolobus solfataricus. MICROBIOLOGY-SGM 2013; 159:1198-1208. [PMID: 23619003 DOI: 10.1099/mic.0.065854-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Crenarchaeota include extremely thermoacidophilic organisms that thrive in geothermal environments dominated by sulfidic ores and heavy metals such as mercury. Mercuric ion, Hg(II), inactivates transcription in the crenarchaeote Sulfolobus solfataricus and simultaneously derepresses transcription of a resistance operon, merHAI, through interaction with the MerR transcription factor. While mercuric reductase (MerA) is required for metal resistance, the role of MerH, an adjacent small and predicted product of an ORF, has not been explored. Inactivation of MerH either by nonsense mutation or by in-frame deletion diminished Hg(II) resistance of mutant cells. Promoter mapping studies indicated that Hg(II) sensitivity of the merH nonsense mutant arose through transcriptional polarity, and its metal resistance was restored partially by single copy merH complementation. Since MerH was not required in vitro for MerA-catalysed Hg(II) reduction, MerH may play an alternative role in metal resistance. Inductively coupled plasma-mass spectrometry analysis of the MerH deletion strain following metal challenge indicated that there was prolonged retention of intracellular Hg(II). Finally, a reduced rate of mer operon induction in the merH deletion mutant suggested that the requirement for MerH could result from metal trafficking to the MerR transcription factor.
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Affiliation(s)
- James Schelert
- School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, NE 68508, USA
| | - Deepak Rudrappa
- School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, NE 68508, USA
| | - Tyler Johnson
- School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, NE 68508, USA
| | - Paul Blum
- School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, NE 68508, USA
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Frolova O, Samudio I, Benito JM, Jacamo R, Kornblau SM, Markovic A, Schober W, Lu H, Qiu YH, Buglio D, McQueen T, Pierce S, Shpall E, Konoplev S, Thomas D, Kantarjian H, Lock R, Andreeff M, Konopleva M. Regulation of HIF-1α signaling and chemoresistance in acute lymphocytic leukemia under hypoxic conditions of the bone marrow microenvironment. Cancer Biol Ther 2012; 13:858-70. [PMID: 22785211 DOI: 10.4161/cbt.20838] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Overcoming resistance to chemotherapy is the main therapeutic challenge in the treatment of acute lymphocytic leukemia (ALL). Interactions between leukemia cells and the microenvironment promote leukemia cell survival and confer resistance to chemotherapy. Hypoxia is an integral component of bone marrow (BM) microenvironment. Hypoxia-inducible factor-1α (HIF-1), a key regulator of the cellular response to hypoxia, regulates cell growth and metabolic adaptation to hypoxia. HIF-1α expression, analyzed by Reverse Phase Protein Arrays in 92 specimens from newly diagnosed patients with pre-B-ALL, had a negative prognostic impact on survival (p = 0.0025). Inhibition of HIF-1α expression by locked mRNA antagonist (LNA) promoted chemosensitivity under hypoxic conditions, while pharmacological or genetic stabilization of HIF-1α under normoxia inhibited cell growth and reduced apoptosis induction by chemotherapeutic agents. Co-culture of pre-B ALL or REH cells with BM-derived mesenchymal stem cells (MSC) under hypoxia resulted in further induction of HIF-1α protein and acquisition of the glycolytic phenotype, in part via stroma-induced AKT/mTOR signaling. mTOR blockade with everolimus reduced HIF-1α expression, diminished glucose uptake and glycolytic rate and partially restored the chemosensitivity of ALL cells under hypoxia/stroma co-cultures. Hence, mTOR inhibition or blockade of HIF-1α-mediated signaling may play an important role in chemosensitization of ALL cells under hypoxic conditions of the BM microenvironment.
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Affiliation(s)
- Olga Frolova
- Department of Leukemia, The University of Texas M D Anderson Cancer Center, Houston, TX, USA
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25
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El Azreq MA, Naci D, Aoudjit F. Collagen/β1 integrin signaling up-regulates the ABCC1/MRP-1 transporter in an ERK/MAPK-dependent manner. Mol Biol Cell 2012; 23:3473-84. [PMID: 22787275 PMCID: PMC3431945 DOI: 10.1091/mbc.e12-02-0132] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Collagen/β1 integrin/extracellular signal-regulated kinase signaling up-regulates the expression and function of ABCC1 transporter. This suggests that its activation could represent an important pathway in cancer chemoresistance. The mechanisms by which β1 integrins regulate chemoresistance of cancer cells are still poorly understood. In this study, we report that collagen/β1 integrin signaling inhibits doxorubicin-induced apoptosis of Jurkat and HSB2 leukemic T-cells by up-regulating the expression and function of the ATP-binding cassette C 1 (ABCC1) transporter, also known as multidrug resistance–associated protein 1. We find that collagen but not fibronectin reduces intracellular doxorubicin content and up-regulates the expression levels of ABCC1. Inhibition and knockdown studies show that up-regulation of ABCC1 is necessary for collagen-mediated reduction of intracellular doxorubicin content and collagen-mediated inhibition of doxorubicin-induced apoptosis. We also demonstrate that activation of the extracellular signal-regulated kinase (ERK)/mitogen-activated protein kinase signaling pathway is involved in collagen-induced reduction of intracellular doxorubicin accumulation, collagen-induced up-regulation of ABCC1 expression levels, and collagen-mediated cell survival. Finally, collagen-mediated up-regulation of ABCC1 expression and function also requires actin polymerization. Taken together, our results indicate for the first time that collagen/β1 integrin/ERK signaling up-regulates the expression and function of ABCC1 and suggest that its activation could represent an important pathway in cancer chemoresistance. Thus simultaneous targeting of collagen/β1 integrin and ABCC1 may be more efficient in preventing drug resistance than targeting each pathway alone.
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Affiliation(s)
- Mohammed-Amine El Azreq
- Centre de Recherche en Rhumatologie/Immunologie, Centre Hospitalier Universitaire de Québec, Université Laval, Québec, QC G1V 4G2, Canada
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Outer dynein arm light chain 1 is essential for controlling the ciliary response to cyclic AMP in Paramecium tetraurelia. EUKARYOTIC CELL 2012; 11:645-53. [PMID: 22427431 DOI: 10.1128/ec.05279-11] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The individual role of the outer dynein arm light chains in the molecular mechanisms of ciliary movements in response to second messengers, such as Ca(2+) and cyclic nucleotides, is unclear. We examined the role of the gene termed the outer dynein arm light chain 1 (LC1) gene of Paramecium tetraurelia (ODAL1), a homologue of the outer dynein arm LC1 gene of Chlamydomonas reinhardtii, in ciliary movements by RNA interference (RNAi) using a feeding method. The ODAL1-silenced (ODAL1-RNAi) cells swam slowly, and their swimming velocity did not increase in response to membrane-hyperpolarizing stimuli. Ciliary movements on the cortical sheets of ODAL1-RNAi cells revealed that the ciliary beat frequency was significantly lower than that of control cells in the presence of ≥ 1 mM Mg(2+)-ATP. In addition, the ciliary orientation of ODAL1-RNAi cells did not change in response to cyclic AMP (cAMP). A 29-kDa protein phosphorylated in a cAMP-dependent manner in the control cells disappeared in the axoneme of ODAL1-RNAi cells. These results indicate that ODAL1 is essential for controlling the ciliary response by cAMP-dependent phosphorylation.
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27
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Zhang GJ, Gao R, Wang JS, Fu JK, Zhang MX, Jin X. Various doses of fractioned irradiation modulates multidrug resistance 1 expression differently through hypoxia-inducible factor 1α in esophageal cancer cells. Dis Esophagus 2011; 24:481-8. [PMID: 21309917 DOI: 10.1111/j.1442-2050.2010.01168.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
To evaluate the effect of different regimen of radiotherapy on multidrug resistance 1 (MDR1) expression and analyze the role hypoxia-inducible factor 1α (HIF1α) played in the whole process. Fifty-four cell lines established from 96 esophageal cancer biopsy samples were given various doses of fractioned irradiation. The mRNA and protein levels of HIF1α and MDR1 post-irradiation were measured by quantitative reverse transcription-polymerase chain reaction and Western blot analysis, respectively. HIF1α-siRNA was used to verify the effect of HIF1α on radiation-mediated MDR1 modulation. In esophageal cancer cells surviving 28 Gy irradiation (2 Gy/f, 14 fractions), MDR1 mRNA expression increased 65.27 ± 5.58%, and HIF1α was elevated by 27.21 ± 2.25%. Interestingly, their expression decreased by 54.38 ± 11.53% and 32.08 ± 4.75% after 7 Gy irradiation (0.5 Gy/f, 14 fractions). HIF1α expression showed a positive correlation with MDR1 expression in the whole process (P < 0.05). Silencing of HIF1α decreased MDR1 expression and blocked changes in MDR1 and HIF1α expression induced by fractioned irradiation. These results indicate that MDR1 is differentially modulated by different doses of fractionated radiation, which should be taken into account when combining radiotherapy and chemotherapy for patients with esophageal cancer.
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Affiliation(s)
- G-J Zhang
- Thoracic Surgery Department, The 1st Affiliated Hospital of Xi'an Jiao Tong University, Xi'an, China
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28
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Wu CP, Hsieh CH, Wu YS. The Emergence of Drug Transporter-Mediated Multidrug Resistance to Cancer Chemotherapy. Mol Pharm 2011; 8:1996-2011. [DOI: 10.1021/mp200261n] [Citation(s) in RCA: 167] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Chung-Pu Wu
- Department of Physiology and Pharmacology, Chang Gung University, Tao-Yuan 333, Taiwan
- Molecular Medicine Research Center, Chang Gung University, Tao-Yuan 333, Taiwan
| | - Chia-Hung Hsieh
- Graduate Institute of Basic Medical Science, China Medical University and Hospital, Taichung, Taiwan
| | - Yu-Shan Wu
- Department of Chemistry, Tunghai University, Taichung, Taiwan
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29
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Maezato Y, Daugherty A, Dana K, Soo E, Cooper C, Tachdjian S, Kelly RM, Blum P. VapC6, a ribonucleolytic toxin regulates thermophilicity in the crenarchaeote Sulfolobus solfataricus. RNA (NEW YORK, N.Y.) 2011; 17:1381-1392. [PMID: 21622901 PMCID: PMC3138573 DOI: 10.1261/rna.2679911] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2011] [Accepted: 04/15/2011] [Indexed: 05/30/2023]
Abstract
The phylum Crenarchaeota includes hyperthermophilic micro-organisms subjected to dynamic thermal conditions. Previous transcriptomic studies of Sulfolobus solfataricus identified vapBC6 as a heat-shock (HS)-inducible member of the Vap toxin-antitoxin gene family. In this study, the inactivation of the vapBC6 operon by targeted gene disruption produced two recessive phenotypes related to fitness, HS sensitivity and a heat-dependent reduction in the rate of growth. In-frame vapBC6 deletion mutants were analyzed to examine the respective roles of each protein. Since vapB6 transcript abundance was elevated in the vapC6 deletion, the VapC6 toxin appears to regulate abundance of its cognate antitoxin. In contrast, vapC6 transcript abundance was reduced in the vapB6 deletion. A putative intergenic terminator may underlie these observations by coordinating vapBC6 expression. As predicted by structural modeling, recombinant VapC6 produced using chaperone cosynthesis exhibited heat-dependent ribonucleolytic activity toward S. solfataricus total RNA. This activity could be blocked by addition of preheated recombinant VapB6. In vivo transcript targets were identified by assessing the relative expression of genes that naturally respond to thermal stress in VapBC6-deficient cells. Preferential increases were observed for dppB-1 and tetR, and preferential decreases were observed for rpoD and eIF2 gamma. Specific VapC6 ribonucleolytic action could also be demonstrated in vitro toward RNAs whose expression increased in the VapBC6-deficient strain during heat shock. These findings provide a biochemical mechanism and identify cellular targets underlying VapBC6-mediated control over microbial growth and survival at temperature extremes.
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Affiliation(s)
- Yukari Maezato
- Beadle Center for Genetics, School of Biological Sciences, University of Nebraska, Lincoln, Nebraska 68588-0666, USA
| | - Amanda Daugherty
- Beadle Center for Genetics, School of Biological Sciences, University of Nebraska, Lincoln, Nebraska 68588-0666, USA
| | - Karl Dana
- Beadle Center for Genetics, School of Biological Sciences, University of Nebraska, Lincoln, Nebraska 68588-0666, USA
| | - Edith Soo
- Beadle Center for Genetics, School of Biological Sciences, University of Nebraska, Lincoln, Nebraska 68588-0666, USA
| | - Charlotte Cooper
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, USA
| | - Sabrina Tachdjian
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, USA
| | - Robert M. Kelly
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, USA
| | - Paul Blum
- Beadle Center for Genetics, School of Biological Sciences, University of Nebraska, Lincoln, Nebraska 68588-0666, USA
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Haudenshield JS, Hartman GL. Exogenous Controls Increase Negative Call Veracity in Multiplexed, Quantitative PCR Assays for Phakopsora pachyrhizi. PLANT DISEASE 2011; 95:343-352. [PMID: 30743502 DOI: 10.1094/pdis-01-10-0023] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Quantitative polymerase chain reaction (Q-PCR) utilizing specific primer sequences and a fluorogenic, 5'-exonuclease linear hydrolysis probe is well established as a detection and identification method for Phakopsora pachyrhizi and P. meibomiae, two rust pathogens of soybean. Because of the extreme sensitivity of Q-PCR, the DNA of single urediniospores of these fungi can be detected from total DNA extracts of environmental samples. However, some DNA preparations unpredictably contain PCR inhibitors that increase the frequency of false negatives indistinguishable from true negatives. Three synthetic DNA molecules of arbitrary sequence were constructed as multiplexed internal controls (ICs) to cull false-negative results by producing a positive signal to validate the PCR process within each individual reaction. The first two, PpaIC and PmeIC, are a single-stranded oligonucleotide flanked by sequences complementary to the primers of either the P. pachyrhizi or P. meibomiae primary assay but hybridizing to a unique fluorogenic probe; the third contains unique primer- and probe-binding sequences, and was prepared as a cloned DNA fragment in a linearized plasmid. These ICs neither qualitatively nor quantitatively affected their primary assays. PpaIC and PmeIC were shown to successfully identify false-negative reactions resulting from endogenous or exogenous inhibitors, and can be readily adapted to function in a variety of diagnostic Q-PCR assays; the plasmid was found to successfully validate true negatives in similar Q-PCR assays for other soybean pathogens, as well as to function as a tracer molecule during DNA extraction and recovery.
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Affiliation(s)
- James S Haudenshield
- United States Department of Agriculture-Agricultural Research Service (USDA-ARS)
| | - Glen L Hartman
- USDA-ARS and Department of Crop Sciences, University of Illinois, Urbana 61801
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31
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Malcomson RD, McCullough CT, Bruce DJ, Harrison DJ. The scope of quantitative polymerase chain reaction assays in clinical molecular pathology. Mol Pathol 2010; 48:M178-83. [PMID: 16696001 PMCID: PMC407957 DOI: 10.1136/mp.48.4.m178] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- R D Malcomson
- Department of Pathology, University of Edinburgh Medical School, Teviot Place, Edinburgh EH8 9AG
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32
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Chou PM, Barquin N, Gonzalez-Crussi F, Sanz CR, Tomita T, Reyes-Mugica M. Ependymomas in Children Express the Multidrug Resistance Gene: Immunohistochemical and Molecular Biologic Study. ACTA ACUST UNITED AC 2010. [DOI: 10.1080/15513819609168692] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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33
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Rendic S, Guengerich FP. Update information on drug metabolism systems--2009, part II: summary of information on the effects of diseases and environmental factors on human cytochrome P450 (CYP) enzymes and transporters. Curr Drug Metab 2010; 11:4-84. [PMID: 20302566 PMCID: PMC4167379 DOI: 10.2174/138920010791110917] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2009] [Accepted: 02/22/2010] [Indexed: 12/14/2022]
Abstract
The present paper is an update of the data on the effects of diseases and environmental factors on the expression and/or activity of human cytochrome P450 (CYP) enzymes and transporters. The data are presented in tabular form (Tables 1 and 2) and are a continuation of previously published summaries on the effects of drugs and other chemicals on CYP enzymes (Rendic, S.; Di Carlo, F. Drug Metab. Rev., 1997, 29(1-2), 413-580., Rendic, S. Drug Metab. Rev., 2002, 34(1-2), 83-448.). The collected information presented here is as stated by the cited author(s), and in cases when several references are cited the latest published information is included. Inconsistent results and conclusions obtained by different authors are highlighted, followed by discussion of the major findings. The searchable database is available as an Excel file, for information about file availability contact the corresponding author.
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Affiliation(s)
- S Rendic
- University of Zagreb, Zagreb, Croatia.
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34
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Eckford PDW, Sharom FJ. ABC efflux pump-based resistance to chemotherapy drugs. Chem Rev 2009; 109:2989-3011. [PMID: 19583429 DOI: 10.1021/cr9000226] [Citation(s) in RCA: 459] [Impact Index Per Article: 30.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Paul D W Eckford
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
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35
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Frydrych I, Mlejnek P, Dolezel P. Cyclosporin A sensitises Bcr-Abl positive cells to imatinib mesylate independently of P-glycoprotein expression. Toxicol In Vitro 2009; 23:1482-90. [PMID: 19735720 DOI: 10.1016/j.tiv.2009.09.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2008] [Revised: 08/14/2009] [Accepted: 09/01/2009] [Indexed: 01/16/2023]
Abstract
The effect of cyclosporin A (CsA) on imatinib treated Bcr-Abl positive K562 cells was studied. Similarly to other authors we found that imatinib induced apoptosis and erythroid differentiation in K562 cells. While its low concentrations induced predominantly erythroid differentiation, higher concentrations induced apoptosis. We found that CsA significantly potentiated cytotoxic effects of imatinib. A detailed analysis revealed that CsA shifted the balance between differentiation and apoptosis in favour of apoptosis. Our findings indicated that the observed effect of CsA was mediated neither through inhibition of ERK1/2 (extracellular signal-regulated kinases 1/2), nor through inhibition of p38 MAPK. We further observed that CsA might sensitise cells to apoptosis due to a changed cellular redox status as combined treatment of cells with imatinib and CsA resulted in a dramatic decrease of the ratio between reduced (GSH) and oxidised (GSSG) glutathione GSH/GSSG and in a significant suppression of thioredoxin reductase enzymatic activity. Our results indicated that K562 cells did not express detectable level of P-glycoprotein (P-gp). In addition, CsA did not affect significantly the intracellular level of imatinib. Therefore we excluded the possibility that CsA increased sensitivity of cells to imatinib by the inhibition of P-gp-mediated drug efflux or by another mechanism involving modulation of intracellular drug concentration.
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Affiliation(s)
- Ivo Frydrych
- Department of Biology, Faculty of Medicine and Dentistry, Palacky University Olomouc, Hnevotinska 3, Olomouc 77515, Czech Republic
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36
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Morozova O, Hirst M, Marra MA. Applications of new sequencing technologies for transcriptome analysis. Annu Rev Genomics Hum Genet 2009; 10:135-51. [PMID: 19715439 DOI: 10.1146/annurev-genom-082908-145957] [Citation(s) in RCA: 340] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Transcriptome analysis has been a key area of biological inquiry for decades. Over the years, research in the field has progressed from candidate gene-based detection of RNAs using Northern blotting to high-throughput expression profiling driven by the advent of microarrays. Next-generation sequencing technologies have revolutionized transcriptomics by providing opportunities for multidimensional examinations of cellular transcriptomes in which high-throughput expression data are obtained at a single-base resolution.
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Affiliation(s)
- Olena Morozova
- BC Cancer Agency, Genome Sciences Center, Vancouver, BC V5Z 4S6, Canada.
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Doroudi R, Andersson M, Svensson PA, Ekman M, Jern S, Karlsson L. Methodological Studies of Multiple Reference Genes as Endogenous Controls in Vascular Gene Expression Studies. ACTA ACUST UNITED AC 2009; 12:215-23. [PMID: 16410220 DOI: 10.1080/10623320500476377] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Detection and quantification of differentially expressed genes requires valid and reliable references to control for error variability introduced by preparatory procedures or efficiency of reverse transcription and polymerase chain reaction (PCR) amplification conditions. So-called housekeeping genes are frequently used as endogenous standards, based on the assumption that they are constitutively expressed and independent of experimental conditions. However, if the influence of experimental stimuli is to be analyzed, it cannot a priori be assumed that their expression is unaffected by stimulation. In the present study, the authors studied the expression of different housekeeping genes in the vascular endothelium of intact conduit vessels perfused in a unique biomechanical perfusion model. Ten control gene candidates were investigated by microarray expression analysis. Further, five of these genes were systematically analyzed by real-time reverse transcriptase (RT)-PCR gene quantification and their suitability as reference genes were evaluated. On the basis of these findings, the authors suggest criteria for evaluation of endogenous control genes in vascular perfusion studies.
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Affiliation(s)
- R Doroudi
- Clinical Experimental Research Laboratory, Cardiovascular Institute Sahlgrenska University Hospital/Ostra, Göteborg University, Sweden
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Lyttelton MPA, Hart S, Ganeshaguru K, Prentice HG, Hoffbrand AV, Mehta AB. Multidrug Resistance in Acute Leukaemia: A Comparative Study of Immunocytochemical and RNA Slot Blot Detection of P-glycoprotein Expression. Leuk Lymphoma 2009; 5:357-64. [DOI: 10.3109/10428199109067629] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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40
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Inhibition of MDR1 does not sensitize primitive chronic myeloid leukemia CD34+ cells to imatinib. Exp Hematol 2009; 37:692-700. [DOI: 10.1016/j.exphem.2009.02.006] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2008] [Revised: 12/23/2008] [Accepted: 02/11/2009] [Indexed: 11/22/2022]
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41
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Liang M, Liu X, Nakamura K, Chen X, Cheng D, Liu G, Dou S, Wang Y, Rusckowski M, Hnatowich DJ. A convenient thiazole orange fluorescence assay for the evaluation of DNA duplex hybridization stability. Mol Imaging Biol 2009; 11:439-45. [PMID: 19444399 DOI: 10.1007/s11307-009-0221-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2008] [Revised: 01/06/2009] [Accepted: 01/16/2009] [Indexed: 11/25/2022]
Abstract
OBJECTIVE A simple and rapid method for measuring the hybridization stability of duplexes of DNAs and other oligomers in different environments is described. When added to an oligomer duplex, the thiazole orange (TO) dye intercalates and in this state is fluorescent. Therefore, when duplex dissociation occurs, the release of TO results in a detectable change in fluorescence intensity. This assay was developed primarily to screen antisense oligomer duplexes that are stable in serum and in the cytoplasm but unstable in the presence of their target messenger RNA (mRNA). METHODS The two antisense oligomers of this investigation were both 25 mer phosphorothioate (PS) DNAs, one directed against the RIalpha mRNA and the other directed against the mdr1 mRNA. The former duplex was first used in the solution studies, in most cases duplexed with a 16 mer phosphodiester (PO) complementary DNA (i.e., PS-DNA25/PO-cDNA16). Both duplexes were then tested in a series of cell studies using SK-BR-3 (RIalpha+), KB-G2 (mdr1++), and KB-31 (mdr1+/-) cells. RESULTS Preliminary measurements in solution showed that maximum fluorescence was achieved when more than ten TO molecules were bound to each duplex. When a 25 mer PO-DNA or PO-RNA with the base sequence of the RIalpha mRNA was added, the dramatic change in fluorescence intensity that followed signified dissociation of the antisense DNA from the study duplex and reassociation with the target DNA. Kinetic measurements showed that this process was completed in about 3 min. Fluorescent measurements of SK-BR-3 (RIalpha+) cells incubated at 37 degrees C with the anti-RIalpha study duplex over time showed a maximum at the point where the loss of fluorescence due to dissociation of the study duplex, probably by an antisense mechanism, began to dominate over the increasing fluorescence due to continuing cellular accumulation. A similar result was observed in the KB-G2 (mdr1+) cells incubated with the anti-mdr1 study duplex. CONCLUSIONS When study duplexes shown to be stable in serum were incubated with their target cells, the assay successfully detected evidence of dissociation, most likely by an antisense mechanism. Thus, a TO fluorescence assay has been developed that is capable of detecting the dissociation of DNA duplexes.
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Affiliation(s)
- Minmin Liang
- Department of Radiology, University of Massachusetts Medical School, Worcester, MA 01655, USA
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42
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Kugawa F, Suzuki T, Miyata M, Tomono K, Tamanoi F. Construction of a model cell line for the assay of MDR1 (multi drug resistance gene-1) substrates/inhibitors using HeLa cells. DIE PHARMAZIE 2009; 64:296-300. [PMID: 19530439 PMCID: PMC4370427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Cancer cells often become resistant to chemotherapy, and induction of the ABC transporter Multi-drug Resistance gene-1 (MDR1) is a major cause. We established a tool for high-throughput screening of substrates and inhibitors of MDR1, using transformed HeLa cells that over-express MDR1. The cDNA for human MDR1 was subcloned into the eukaryotic expression vector pBK-CMV to produce an MDR1 expression vector, pBK-CMV/MDR1. HeLa cells were transfected with pBK-CMV/MDR1 or the empty vector pBK-CMV. Transfection of the vector sequence for MDR1 and its expression were evaluated by genomic PCR and western blotting, respectively. The efficiency of the MDR1 transporter for pumping a substrate out of the transformed cells was evaluated using rhodamine123 (R-123), a mitochondrial dye that is also an MDR1 substrate. After treatment of the MDR1-expressing HeLa cells with MDR1 substrate vinblastin or inhibitors cyclosporin A and verapamil, the amount of R-123 retained in the cells was increased to 2 to 2.3 times the level in untreated MDR1-expressing HeLa cells. The transfection of empty pBK-CMV had no effect on the R-123 retention in HeLa cells, regardless of drug treatment. In conclusion, we have established a model human carcinoma cell line that expresses functional MDR1 and can be used to screen for substrates and inhibitors of MDR1.
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Affiliation(s)
- F Kugawa
- Department of Biopharmaceutics1, School of Pharmacy, Hyogo University of Health Sciences, Kobe, Hyogo, Japan.
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43
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Liu H, Jiang H, Haltli B, Kulowski K, Muszynska E, Feng X, Summers M, Young M, Graziani E, Koehn F, Carter GT, He M. Rapid cloning and heterologous expression of the meridamycin biosynthetic gene cluster using a versatile Escherichia coli-streptomyces artificial chromosome vector, pSBAC. JOURNAL OF NATURAL PRODUCTS 2009; 72:389-395. [PMID: 19191550 DOI: 10.1021/np8006149] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Expression of biosynthetic pathways in heterologous hosts is an emerging approach to expedite production improvement and biosynthetic modification of natural products derived from microbial secondary metabolites. Herein we describe the development of a versatile Escherichia coli-Streptomyces shuttle Bacterial Artificial Chromosomal (BAC) conjugation vector, pSBAC, to facilitate the cloning, genetic manipulation, and heterologous expression of actinomycetes secondary metabolite biosynthetic gene clusters. The utility of pSBAC was demonstrated through the rapid cloning and heterologous expression of one of the largest polyketide synthase (PKS) and nonribosomal peptide synthetase (NRPS) biosynthetic pathways: the meridamycin biosynthesis gene cluster (mer). The entire mer gene cluster ( approximately 90 kb) was captured in a single pSBAC clone through a straightforward restriction enzyme digestion and cloning approach and transferred into Streptomyces lividans. The production of meridamycin (1) in the heterologous host was achieved after replacement of the original promoter with an ermE* promoter and was enhanced by feeding with a biosynthetic precursor. The success of heterologous expression of such a giant gene cluster demonstrates the versatility of BAC cloning technology and paves the road for future exploration of expression of the meridamycin biosynthetic pathway in various hosts, including strains that have been optimized for polyketide production.
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Affiliation(s)
- Hongbo Liu
- Chemical and Screening Science, Wyeth Research, Pearl River, New York 10965, USA
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Abstract
Ewing's sarcoma is one of the few solid tumors for which the underlying molecular genetic abnormality has been described: rearrangement of the EWS gene on chromosome 22q12 with an ETS gene family member. These translocations define the Ewing's sarcoma family of tumors (ESFT) and provide a valuable tool for their accurate and unequivocal diagnosis. They also represent ideal targets for the development of tumor-specific therapeutics. Although secondary abnormalities occur in over 80% of primary ESFT the clinical utility of these is currently unclear. However, abnormalities in genes that regulate the G(1)/S checkpoint are frequently described and may be important in predicting outcome and response. Increased understanding of the molecular events that arise in ESFT and their role in the development and maintenance of the malignant phenotype will inform the improved stratification of patients for therapy and identify targets and pathways for the design of more effective cancer therapeutics.
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Affiliation(s)
- Susan Ann Burchill
- Candlelighter's Children's Cancer Research Group, Cancer Research UK Clinical Centre, Leeds Institute of Molecular Medicine, St James's University Hospital, Leeds, UK.
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45
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Chen H, Wang J, Zhang J, Wang Y, Cao B, Bai S, Yu PF, Bi W, Xie W. L1EPO, a Novel Podophyllotoxin Derivative Overcomes P-Glycoprotein-Mediated Multidrug Resistance in K562/A02 Cell Line. Biol Pharm Bull 2009; 32:609-13. [DOI: 10.1248/bpb.32.609] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Hong Chen
- Medical College of Chinese People's Armed Police Forces
- Tianjin Key Laboratory for Biomarkers of Occupational and Environmental Hazard
| | - Jing Wang
- Medical College of Chinese People's Armed Police Forces
| | - Jingze Zhang
- Medical College of Chinese People's Armed Police Forces
| | - Yizheng Wang
- Medical College of Chinese People's Armed Police Forces
- Tianjin Key Laboratory for Biomarkers of Occupational and Environmental Hazard
| | - Bo Cao
- Medical College of Chinese People's Armed Police Forces
| | - Shufang Bai
- Medical College of Chinese People's Armed Police Forces
| | - Peng-Fei Yu
- Key Lab of New Drugs Design and Discovery of Liaoning Province, School of Pharmaceutical Engineering, Shenyang Pharmaceutical University
| | - Wenchao Bi
- Medical College of Chinese People's Armed Police Forces
| | - Wenli Xie
- Medical College of Chinese People's Armed Police Forces
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46
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Sulová Z, Mislovičová D, Gibalová L, Vajčnerová Z, Poláková E, Uhrík B, Tylková L, Kovárová A, Sedlák J, Breier A. Vincristine-Induced Overexpression of P-Glycoprotein in L1210 Cells Is Associated with Remodeling of Cell Surface Saccharides. J Proteome Res 2008; 8:513-20. [DOI: 10.1021/pr8007094] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zdenka Sulová
- Institute of Molecular Physiology and Genetics, Centre of Excellence of the Slovak Research and Development Agency, BIOMEMBRANES2008, Slovak Academy of Sciences, Vlárska 5 83334, Bratislava, Slovakia, Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 84538, Bratislava, Slovakia, and Cancer Research Institute, Slovak Academy of Sciences, Vlárska 7, 833 91, Bratislava, Slovakia
| | - Danica Mislovičová
- Institute of Molecular Physiology and Genetics, Centre of Excellence of the Slovak Research and Development Agency, BIOMEMBRANES2008, Slovak Academy of Sciences, Vlárska 5 83334, Bratislava, Slovakia, Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 84538, Bratislava, Slovakia, and Cancer Research Institute, Slovak Academy of Sciences, Vlárska 7, 833 91, Bratislava, Slovakia
| | - Lenka Gibalová
- Institute of Molecular Physiology and Genetics, Centre of Excellence of the Slovak Research and Development Agency, BIOMEMBRANES2008, Slovak Academy of Sciences, Vlárska 5 83334, Bratislava, Slovakia, Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 84538, Bratislava, Slovakia, and Cancer Research Institute, Slovak Academy of Sciences, Vlárska 7, 833 91, Bratislava, Slovakia
| | - Zuzana Vajčnerová
- Institute of Molecular Physiology and Genetics, Centre of Excellence of the Slovak Research and Development Agency, BIOMEMBRANES2008, Slovak Academy of Sciences, Vlárska 5 83334, Bratislava, Slovakia, Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 84538, Bratislava, Slovakia, and Cancer Research Institute, Slovak Academy of Sciences, Vlárska 7, 833 91, Bratislava, Slovakia
| | - Eva Poláková
- Institute of Molecular Physiology and Genetics, Centre of Excellence of the Slovak Research and Development Agency, BIOMEMBRANES2008, Slovak Academy of Sciences, Vlárska 5 83334, Bratislava, Slovakia, Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 84538, Bratislava, Slovakia, and Cancer Research Institute, Slovak Academy of Sciences, Vlárska 7, 833 91, Bratislava, Slovakia
| | - Branislav Uhrík
- Institute of Molecular Physiology and Genetics, Centre of Excellence of the Slovak Research and Development Agency, BIOMEMBRANES2008, Slovak Academy of Sciences, Vlárska 5 83334, Bratislava, Slovakia, Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 84538, Bratislava, Slovakia, and Cancer Research Institute, Slovak Academy of Sciences, Vlárska 7, 833 91, Bratislava, Slovakia
| | - Lucia Tylková
- Institute of Molecular Physiology and Genetics, Centre of Excellence of the Slovak Research and Development Agency, BIOMEMBRANES2008, Slovak Academy of Sciences, Vlárska 5 83334, Bratislava, Slovakia, Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 84538, Bratislava, Slovakia, and Cancer Research Institute, Slovak Academy of Sciences, Vlárska 7, 833 91, Bratislava, Slovakia
| | - Annamária Kovárová
- Institute of Molecular Physiology and Genetics, Centre of Excellence of the Slovak Research and Development Agency, BIOMEMBRANES2008, Slovak Academy of Sciences, Vlárska 5 83334, Bratislava, Slovakia, Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 84538, Bratislava, Slovakia, and Cancer Research Institute, Slovak Academy of Sciences, Vlárska 7, 833 91, Bratislava, Slovakia
| | - Ján Sedlák
- Institute of Molecular Physiology and Genetics, Centre of Excellence of the Slovak Research and Development Agency, BIOMEMBRANES2008, Slovak Academy of Sciences, Vlárska 5 83334, Bratislava, Slovakia, Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 84538, Bratislava, Slovakia, and Cancer Research Institute, Slovak Academy of Sciences, Vlárska 7, 833 91, Bratislava, Slovakia
| | - Albert Breier
- Institute of Molecular Physiology and Genetics, Centre of Excellence of the Slovak Research and Development Agency, BIOMEMBRANES2008, Slovak Academy of Sciences, Vlárska 5 83334, Bratislava, Slovakia, Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 84538, Bratislava, Slovakia, and Cancer Research Institute, Slovak Academy of Sciences, Vlárska 7, 833 91, Bratislava, Slovakia
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47
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Ren Y, Wang Y, Zhang Y, Wei D. Overcoming multidrug resistance in human carcinoma cells by an antisense oligodeoxynucleotide--doxorubicin conjugate in vitro and in vivo. Mol Pharm 2008; 5:579-87. [PMID: 18461970 DOI: 10.1021/mp800001j] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Multidrug resistance (MDR), a major obstacle to successful cancer chemotherapy, may be induced by amplification of the MDR1 gene and overexpression of the P-glycoprotein (P-gp), which acts as drug efflux pump decreasing intracellular drug accumulation. In this study, an antisense oligodeoxynucleotide--doxorubicin conjugate was used to overcome MDR in a human carcinoma-resistant cell line, both in vitro and in vivo, through downregulation of P-gp expression and mRNA levels. Compared with the unmodified antisense-oligodeoxynucleotide (AS-ODN), the conjugate markedly inhibited P-gp expression and mRNA levels. With in vitro treatment with the conjugate, the intracellular accumulation of doxorubicin (DOX) was increased 4.4-fold compared to treatment with DOX alone; by contrast, a 2.2-fold increase was observed when treated with AS-ODN alone. In the in vivo studies, it was approximately 3.5-fold higher compared to the control group treatment with DOX alone and 2.1-fold higher than found with AS-ODN. The weight of tumors formed was markedly decreased after conjugate treatment as compared to either treatments with AS-ODN or DOX alone. Furthermore, treatment with combinations of the agents appeared to be well tolerated. These results suggest that a strategy using the conjugate in combination with antitumor drugs may comprise a powerful treatment for MDR.
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Affiliation(s)
- Yuhong Ren
- State Key Laboratory of Bioreactor Engineering, Institute of Biochemistry, East China University of Science and Technology, Shanghai, China.
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48
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Caffeine regulates alternative splicing in a subset of cancer-associated genes: a role for SC35. Mol Cell Biol 2007; 28:883-95. [PMID: 18025108 DOI: 10.1128/mcb.01345-07] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Alternative splicing of pre-mRNA contributes significantly to human proteomic complexity, playing a key role in development, gene expression and, when aberrant, human disease onset. Many of the factors involved in alternative splicing have been identified, but little is known about their regulation. Here we report that caffeine regulates alternative splicing of a subset of cancer-associated genes, including the tumor suppressor KLF6. This regulation is at the level of splice site selection, occurs rapidly and reversibly, and is concentration dependent. We have recapitulated caffeine-induced alternative splicing of KLF6 using a cell-based minigene assay and identified a "caffeine response element" within the KLF6 intronic sequence. Significantly, a chimeric minigene splicing assay demonstrated that this caffeine response element is functional in a heterologous context; similar elements exist within close proximity to caffeine-regulated exons of other genes in the subset. Furthermore, the SR splicing factor, SC35, was shown to be required for induction of the alternatively spliced KLF6 transcript. Importantly, SC35 is markedly induced by caffeine, and overexpression of SC35 is sufficient to mimic the effect of caffeine on KLF6 alternative splicing. Taken together, our data implicate SC35 as a key player in caffeine-mediated splicing regulation. This novel effect of caffeine provides a valuable tool for dissecting the regulation of alternative splicing of a large gene subset and may have implications with respect to splice variants associated with disease states.
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49
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Wu C, Wei Q, Utomo V, Nadesan P, Whetstone H, Kandel R, Wunder JS, Alman BA. Side population cells isolated from mesenchymal neoplasms have tumor initiating potential. Cancer Res 2007; 67:8216-22. [PMID: 17804735 DOI: 10.1158/0008-5472.can-07-0999] [Citation(s) in RCA: 178] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Although many cancers are maintained by tumor-initiating cells, this has not been shown for mesenchymal tumors, in part due to the lack of unique surface markers that identify mesenchymal progenitors. An alternative technique to isolate stem-like cells is to isolate side population (SP) cells based on efflux of Hoechst 33342 dye. We examined 29 mesenchymal tumors ranging from benign to high-grade sarcomas and identified SP cells in all but six samples. There was a positive correlation between the percentage of SP cells and the grade of the tumor. SP cells preferentially formed tumors when grafted into immunodeficient mice, and only cells from tumors that developed from the SP cells had the ability to initiate tumor formation upon serial transplantation. Although SP cells are able to efflux rhodamine dye in addition to Hoechst 33342, we found that the ability to efflux rhodamine dye did not identify a population of cells enriched for tumor-initiating capacity. Here, we identify a subpopulation of cells within a broad range of benign and malignant mesenchymal tumors with tumor-initiating capacity. In addition, our data suggest that the proportion of SP cells could be used as a prognostic factor and that therapeutically targeting this subpopulation of cells could be used to improve patient outcome.
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Affiliation(s)
- Colleen Wu
- Program in Developmental and Stem Cell Biology, Toronto Medical Discovery Tower, Hospital for Sick Children, Toronto, ON, Canada
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50
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Limtrakul P, Siwanon S, Yodkeeree S, Duangrat C. Effect of Stemona curtisii root extract on P-glycoprotein and MRP-1 function in multidrug-resistant cancer cells. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2007; 14:381-9. [PMID: 17467965 DOI: 10.1016/j.phymed.2007.03.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Multidrug resistance (MDR) is the result of overexpression of membrane bound proteins that efflux chemotherapeutic drugs from the cells. Two proteins, P-glycoprotein (P-gp) and multidrug-resistance associated protein-1 (MRP-1) efflux chemotherapeutic agents out of the cancer cell that decrease intracellular drug accumulation, thereby decreasing the effectiveness of many chemotherapeutic agents. In the present study, the ethanolic extract of the roots of Stemona curtisii Hook. was tested for the potential ability to modulate the MDR phenotype and function of P-gp and MRP-1. The S. curtisii extract reversed the resistance to putative chemotherapeutic agents, including vinblastine, paclitaxel and colchicine of KB-V1 cells (MDR human cervical carcinoma with high P-gp expression) in a dose-dependent manner, but not in KB-3-1 cells (drug sensitive human cervical carcinoma, which lack P-gp expression). The root extract also increased the intracellular uptake and retention of (3)[H]-vinblastine in KB-V1 cells dose dependently. The extract did not influence MDR phenotype-mediated MRP-1 in MRP1-HEK293 (human embryonic kidney cells stably transfected with pcDNA3.1-MRP1-H10 which show high MRP-1 expression) and pcDNA3.1-HEK293 (wild type). In summary, the S. curtisii root extract modulated P-gp activity but not MRP-1 activity. The result obtained from this study strongly indicated that S. curtisii extract may play an important role as a P-gp modulator as used in vitro and may be effective in the treatment of multidrug-resistant cancers. The purified form of the active components of S. curtisii extract should be investigated in more details in order to explain the molecular mechanisms involved in P-gp modulation. This is the first report of new biological activity in this plant, which could be a potential source of a new chemosensitizer.
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Affiliation(s)
- P Limtrakul
- Department of Biochemistry, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand.
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