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Bai B, Chen Q, Jing R, He X, Wang H, Ban Y, Ye Q, Xu W, Zheng C. Molecular Basis of Prostate Cancer and Natural Products as Potential Chemotherapeutic and Chemopreventive Agents. Front Pharmacol 2021; 12:738235. [PMID: 34630112 PMCID: PMC8495205 DOI: 10.3389/fphar.2021.738235] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Accepted: 09/06/2021] [Indexed: 12/12/2022] Open
Abstract
Prostate cancer is the second most common malignant cancer in males. It involves a complex process driven by diverse molecular pathways that closely related to the survival, apoptosis, metabolic and metastatic characteristics of aggressive cancer. Prostate cancer can be categorized into androgen dependent prostate cancer and castration-resistant prostate cancer and cure remains elusive due to the developed resistance of the disease. Natural compounds represent an extraordinary resource of structural scaffolds with high diversity that can offer promising chemical agents for making prostate cancer less devastating and curable. Herein, those natural compounds of different origins and structures with potential cytotoxicity and/or in vivo anti-tumor activities against prostate cancer are critically reviewed and summarized according to the cellular signaling pathways they interfere. Moreover, the anti-prostate cancer efficacy of many nutrients, medicinal plant extracts and Chinese medical formulations were presented, and the future prospects for the application of these compounds and extracts were discussed. Although the failure of conventional chemotherapy as well as involved serious side effects makes natural products ideal candidates for the treatment of prostate cancer, more investigations of preclinical and even clinical studies are necessary to make use of these medical substances reasonably. Therefore, the elucidation of structure-activity relationship and precise mechanism of action, identification of novel potential molecular targets, and optimization of drug combination are essential in natural medicine research and development.
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Affiliation(s)
- Bingke Bai
- Department of Chinese Medicine Authentication, School of Pharmacy, Second Military Medical University, Shanghai, China
| | - Qianbo Chen
- Department of Anesthesiology, Shanghai Eastern Hepatobiliary Surgery Hospital, Shanghai, China
| | - Rui Jing
- Department of Chinese Medicine Authentication, School of Pharmacy, Second Military Medical University, Shanghai, China
| | - Xuhui He
- Department of Chinese Medicine Authentication, School of Pharmacy, Second Military Medical University, Shanghai, China
| | - Hongrui Wang
- Department of Chinese Medicine Authentication, School of Pharmacy, Second Military Medical University, Shanghai, China
| | - Yanfei Ban
- Department of Chinese Medicine Authentication, School of Pharmacy, Second Military Medical University, Shanghai, China
| | - Qi Ye
- Department of Biological Science, College of Life Science, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Weiheng Xu
- Department of Biochemical Pharmacy, School of Pharmacy, Second Military Medical University, Shanghai, China
| | - Chengjian Zheng
- Department of Chinese Medicine Authentication, School of Pharmacy, Second Military Medical University, Shanghai, China
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Investigation of the Anti-Prostate Cancer Properties of Marine-Derived Compounds. Mar Drugs 2018; 16:md16050160. [PMID: 29757237 PMCID: PMC5983291 DOI: 10.3390/md16050160] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Revised: 04/30/2018] [Accepted: 05/09/2018] [Indexed: 12/14/2022] Open
Abstract
This review focuses on marine compounds with anti-prostate cancer properties. Marine species are unique and have great potential for the discovery of anticancer drugs. Marine sources are taxonomically diverse and include bacteria, cyanobacteria, fungi, algae, and mangroves. Marine-derived compounds, including nucleotides, amides, quinones, polyethers, and peptides are biologically active compounds isolated from marine organisms such as sponges, ascidians, gorgonians, soft corals, and bryozoans, including those mentioned above. Several compound classes such as macrolides and alkaloids include drugs with anti-cancer mechanisms, such as antioxidants, anti-angiogenics, antiproliferatives, and apoptosis-inducing drugs. Despite the diversity of marine species, most marine-derived bioactive compounds have not yet been evaluated. Our objective is to explore marine compounds to identify new treatment strategies for prostate cancer. This review discusses chemically and pharmacologically diverse marine natural compounds and their sources in the context of prostate cancer drug treatment.
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Licon-Munoz Y, Michel V, Fordyce CA, Parra KJ. F-actin reorganization by V-ATPase inhibition in prostate cancer. Biol Open 2017; 6:1734-1744. [PMID: 29038303 PMCID: PMC5703614 DOI: 10.1242/bio.028837] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The vacuolar ATPase (V-ATPase) proton pump sustains cellular pH homeostasis, and its inhibition triggers numerous stress responses. However, the cellular mechanisms involved remain largely elusive in cancer cells. We studied V-ATPase in the prostate cancer (PCa) cell line PC-3, which has characteristics of highly metastatic PCa. V-ATPase inhibitors impaired endo-lysosomal pH, vesicle trafficking, migration, and invasion. V-ATPase accrual in the Golgi and recycling endosomes suggests that traffic of internalized membrane vesicles back to the plasma membrane was particularly impaired. Directed movement provoked co-localization of V-ATPase containing vesicles with F-actin near the leading edge of migrating cells. V-ATPase inhibition prompted prominent F-actin cytoskeleton reorganization. Filopodial projections were reduced, which related to reduced migration velocity. F-actin formed novel cytoplasmic rings. F-actin rings increased with extended exposure to sublethal concentrations of V-ATPase inhibitors, from 24 to 48 h, as the amount of alkalinized endo-lysosomal vesicles increased. Studies with chloroquine indicated that F-actin rings formation was pH-dependent. We hypothesize that these novel F-actin rings assemble to overcome widespread traffic defects caused by V-ATPase inhibition, similar to F-actin rings on the surface of exocytic organelles. Summary: V-ATPase activates multiple stress responses. In prostate cancer, sub-lethal concentrations of V-ATPase inhibitors trigger widespread traffic defects. F-actin assembles into rings that mimic those seen during regulated exocytosis.
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Affiliation(s)
- Yamhilette Licon-Munoz
- Department of Biochemistry and Molecular Biology, School of Medicine, University of New Mexico, Albuquerque, New Mexico 87131, USA
| | - Vera Michel
- Department of Biochemistry and Molecular Biology, School of Medicine, University of New Mexico, Albuquerque, New Mexico 87131, USA
| | - Colleen A Fordyce
- Department of Biochemistry and Molecular Biology, School of Medicine, University of New Mexico, Albuquerque, New Mexico 87131, USA
| | - Karlett J Parra
- Department of Biochemistry and Molecular Biology, School of Medicine, University of New Mexico, Albuquerque, New Mexico 87131, USA
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de Souza D, Mariano DOC, Nedel F, Schultze E, Campos VF, Seixas F, da Silva RS, Munchen TS, Ilha V, Dornelles L, Braga AL, Rocha JBT, Collares T, Rodrigues OED. New Organochalcogen Multitarget Drug: Synthesis and Antioxidant and Antitumoral Activities of Chalcogenozidovudine Derivatives. J Med Chem 2015; 58:3329-39. [DOI: 10.1021/jm5015296] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Diego de Souza
- LabSelen-NanoBio
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Brazil
| | - Douglas O. C. Mariano
- LabSelen-NanoBio
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Brazil
| | - Fernanda Nedel
- Molecular
and Cellular Oncology Group, Graduate Program in Biotechnology, Universidade Federal de Pelotas, 96010-610 Pelotas, Brazil
| | - Eduarda Schultze
- Molecular
and Cellular Oncology Group, Graduate Program in Biotechnology, Universidade Federal de Pelotas, 96010-610 Pelotas, Brazil
| | - Vinícius F. Campos
- Molecular
and Cellular Oncology Group, Graduate Program in Biotechnology, Universidade Federal de Pelotas, 96010-610 Pelotas, Brazil
| | - Fabiana Seixas
- Molecular
and Cellular Oncology Group, Graduate Program in Biotechnology, Universidade Federal de Pelotas, 96010-610 Pelotas, Brazil
| | - Rafael S. da Silva
- LabSelen-NanoBio
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Brazil
| | - Taiana S. Munchen
- LabSelen-NanoBio
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Brazil
| | - Vinicius Ilha
- LabSelen-NanoBio
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Brazil
| | - Luciano Dornelles
- LabSelen-NanoBio
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Brazil
| | - Antonio L. Braga
- Departamento
de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, Brazil
| | - João B. T. Rocha
- LabSelen-NanoBio
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Brazil
| | - Tiago Collares
- Molecular
and Cellular Oncology Group, Graduate Program in Biotechnology, Universidade Federal de Pelotas, 96010-610 Pelotas, Brazil
| | - Oscar E. D. Rodrigues
- LabSelen-NanoBio
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Brazil
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Monte LG, Santi-Gadelha T, Reis LB, Braganhol E, Prietsch RF, Dellagostin OA, e Lacerda RR, Gadelha CAA, Conceição FR, Pinto LS. Lectin of Abelmoschus esculentus (okra) promotes selective antitumor effects in human breast cancer cells. Biotechnol Lett 2013; 36:461-9. [DOI: 10.1007/s10529-013-1382-4] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Accepted: 10/03/2013] [Indexed: 01/30/2023]
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Michel V, Licon-Munoz Y, Trujillo K, Bisoffi M, Parra KJ. Inhibitors of vacuolar ATPase proton pumps inhibit human prostate cancer cell invasion and prostate-specific antigen expression and secretion. Int J Cancer 2013; 132:E1-10. [PMID: 22945374 PMCID: PMC3504192 DOI: 10.1002/ijc.27811] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2012] [Accepted: 08/14/2012] [Indexed: 11/09/2022]
Abstract
Vacuolar ATPases (V-ATPases) comprise specialized and ubiquitously distributed pumps that acidify intracellular compartments and energize membranes. To gain new insights into the roles of V-ATPases in prostate cancer (PCa), we studied the effects of inhibiting V-ATPase pumps in androgen-dependent (LNCaP) and androgen-independent (C4-2B) cells of a human PCa progression model. Treatment with nanomolar concentrations of the V-ATPase inhibitors bafilomycin A or concanamycin A reduced the in vitro invasion in both cell types by 80%, regardless that V-ATPase was prominent at the plasma membrane of C4-2B cells and only traces were detected in the low-metastatic LNCaP parental cells. In both cell types, intracellular V-ATPase was excessive and co-localized with prostate-specific antigen (PSA) in the Golgi compartment. V-ATPase inhibitors reversibly excluded PSA from the Golgi and led to the accumulation of largely dispersed PSA-loaded vesicles of lysosomal composition. Inhibition of acridine orange staining and transferrin receptor recycling suggested defective endosomal and lysosomal acidification. The inhibitors, additionally, interfered with the AR-PSA axis under conditions that reduced invasion. Bafilomycin A significantly reduced steady-state and R1881-induced PSA mRNA expression and secretion in the LNCaP cells which are androgen-dependent, but not in the C4-2B cells which are androgen ablation-resistant. In the C4-2B cells, an increased susceptibility to V-ATPase inhibitors was detected after longer treatments, as proliferation was reduced and reversibility of bafilomycin-induced responses impaired. These findings make V-ATPases attractive targets against early and advanced PCa tumors.
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Affiliation(s)
- Vera Michel
- Department of Biochemistry and Molecular Biology, School of Medicine, University of New Mexico Health Sciences Center, Albuquerque, New Mexico, USA, 87131
| | - Yamhilette Licon-Munoz
- Department of Biochemistry and Molecular Biology, School of Medicine, University of New Mexico Health Sciences Center, Albuquerque, New Mexico, USA, 87131
| | - Kristina Trujillo
- Department of Biochemistry and Molecular Biology, School of Medicine, University of New Mexico Health Sciences Center, Albuquerque, New Mexico, USA, 87131
| | - Marco Bisoffi
- Department of Biochemistry and Molecular Biology, School of Medicine, University of New Mexico Health Sciences Center, Albuquerque, New Mexico, USA, 87131
| | - Karlett J. Parra
- Department of Biochemistry and Molecular Biology, School of Medicine, University of New Mexico Health Sciences Center, Albuquerque, New Mexico, USA, 87131
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de Vasconcelos A, Campos VF, Nedel F, Seixas FK, Dellagostin OA, Smith KR, de Pereira CMP, Stefanello FM, Collares T, Barschak AG. Cytotoxic and apoptotic effects of chalcone derivatives of 2-acetyl thiophene on human colon adenocarcinoma cells. Cell Biochem Funct 2012; 31:289-97. [PMID: 22987398 DOI: 10.1002/cbf.2897] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Revised: 07/30/2012] [Accepted: 08/24/2012] [Indexed: 12/23/2022]
Abstract
Recent studies report that chalcones exhibit cytotoxicity to human cancer cell lines. Typically, the form of cell death induced by these compounds is apoptosis. In the context of the discovery of new anticancer agents and in light of the antitumour potential of several chalcone derivatives, in the present study, we synthesized and tested the cytotoxicity of six chalcone derivatives on human colon adenocarcinoma cells. Six derivatives of 3-phenyl-1-(thiophen-2-yl) prop-2-en-1-one were prepared and characterized on the basis of their (1) H and (13) C NMR spectra. HT-29 cells were treated with synthesized chalcones on two concentrations by three different incubation times. Cells were evaluated by cell morphology, Tetrazolium dye (MTT) colorimetric assay, live/dead, flow cytometry (annexin V) and gene expression analyses to determine the cytotoxic way. Chalcones 3-(4-bromophenyl)-1-(thiophen-2-yl)prop-2-en-1-one (C06) and 3-(2-nitrophenyl)-1-(thiophen-2-yl)prop-2-en-1-one (C09) demonstrated higher cytotoxicity than other chalcones as shown by cell morphology, live/dead and MTT assays. In addition, C06 induced apoptosis on flow cytometry annexin V assay. These data were confirmed by a decreased expression of anti-apoptotic genes and increased pro-apoptotic genes. Our findings indicate in summary that the cytotoxic activity of chalcone C06 on colorectal carcinoma cells occurs by apoptosis.
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Affiliation(s)
- Alana de Vasconcelos
- Programa de Pós-Graduação em Química, UFPel, Campus Universitário de Capão do Leão, Pelotas, RS, Brazil
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Nedel F, Campos VF, Alves D, McBride AJA, Dellagostin OA, Collares T, Savegnago L, Seixas FK. Substituted diaryl diselenides: cytotoxic and apoptotic effect in human colon adenocarcinoma cells. Life Sci 2012; 91:345-52. [PMID: 22884807 DOI: 10.1016/j.lfs.2012.07.023] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2012] [Revised: 07/12/2012] [Accepted: 07/18/2012] [Indexed: 10/28/2022]
Abstract
AIMS To investigate the effects and study the underlying cell death mechanisms of diaryl diselenides, including: diphenyl diselenide (C(6)H(5)Se)(2); 4-chlorodiphenyl diselenide (4-ClC(6)H(4)Se)(2); 3-(trifluoromethyl)-diphenyl diselenide (3-CF(3)C(6)H(4)Se)(2) and 4-methoxydiphenyl diselenide (4-MeOC(6)H(4)Se)(2), on the human colon adenocarcinoma cell line HT-29. MAIN METHODS The viability of HT-29 cells after exposure to the diaryl diselenides and its substituted structures was based on the MTT assay. To verify if cell death was mediated throughout apoptosis mechanisms, flow cytometry and real-time PCR (qPCR) analyses were conducted. KEY FINDINGS The MTT assay and flow cytometry analyses showed that (3-CF(3)C(6)H(4)Se)(2) and (4-MeOC(6)H(4)Se)(2) induced cytotoxicity through apoptosis mechanisms in HT-29 cells. qPCR revealed there was an up-regulation of pro-apoptotic (Bax, casapase-9, caspase-8, apoptosis-inducing factor (AIF) and Endonuclease G (EndoG)) and cell-cycle arrest genes (p53 and p21) and down-regulation of anti-apoptotic (Bcl-2 and survivin) and Myc genes. SIGNIFICANCE These results demonstrate that (3-CF(3)C(6)H(4)Se)₂ and (4-MeOC(6)H(4)Se)(2) have the potential to induce apoptosis in HT-29 cells through the activation of caspase-dependent and independent pathways and through cell-cycle arrest.
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Affiliation(s)
- Fernanda Nedel
- Grupo de Oncologia Celular e Molecular, Programa de Pós-Graduação em Biotecnologia, Centro de Desenvolvimento Tecnológico/Biotecnologia, Universidade Federal de Pelotas, Capão do Leão, RS 96010-900, Brazil
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Abstract
Iejimalide B, a structurally unique 24-membered polyene macrolide having a previously underutilized mode of anticancer activity, was synthesized according to a strategy employing Julia-Kocienski olefinations, a palladium-catalyzed Heck reaction, a palladium-catalyzed Marshall propargylation, a Keck-type esterification, and a palladium-catalyzed macrolide-forming, intramolecular Stille coupling of a highly complex cyclization substrate. The overall synthesis is efficient (19.5% overall yield for 15 linear steps) and allows for more practical scaled-up synthesis than previously reported strategies that differed in the order of assembly of key subunits and in the method of macrocyclization. The present synthesis paves the way for efficient preparation of analogues for drug development efforts.
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Affiliation(s)
- Qingshou Chen
- Department of Chemistry and Biochemistry and Harper Cancer Research Center, University of Notre Dame, Notre Dame, Indiana 46556
- Department of Medicinal Chemistry & Molecular Pharmacology, Laboratory for Chemical Biology & Drug Development, Bindley Bioscience Center at Purdue Discovery Park, West Lafayette, IN 47907-2057
| | - Dirk Schweitzer
- Department of Chemistry and Biochemistry and Harper Cancer Research Center, University of Notre Dame, Notre Dame, Indiana 46556
| | - John Kane
- Department of Chemistry and Biochemistry and Harper Cancer Research Center, University of Notre Dame, Notre Dame, Indiana 46556
| | - V. Jo Davisson
- Department of Medicinal Chemistry & Molecular Pharmacology, Laboratory for Chemical Biology & Drug Development, Bindley Bioscience Center at Purdue Discovery Park, West Lafayette, IN 47907-2057
| | - Paul Helquist
- Department of Chemistry and Biochemistry and Harper Cancer Research Center, University of Notre Dame, Notre Dame, Indiana 46556
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Wang WLW, Chatterjee N, Chittur SV, Welsh J, Tenniswood MP. Effects of 1α,25 dihydroxyvitamin D3 and testosterone on miRNA and mRNA expression in LNCaP cells. Mol Cancer 2011; 10:58. [PMID: 21592394 PMCID: PMC3112430 DOI: 10.1186/1476-4598-10-58] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2011] [Accepted: 05/18/2011] [Indexed: 02/07/2023] Open
Abstract
Background There is evidence from epidemiological and in vitro studies that the biological effects of testosterone (T) on cell cycle and survival are modulated by 1,25-dihydroxyvitamin D3 (1,25(OH)2D3) in prostate cancer. To investigate the cross talk between androgen- and vitamin D-mediated intracellular signaling pathways, the individual and combined effects of T and 1,25(OH)2D3 on global gene expression in LNCaP prostate cancer cells were assessed. Results Stringent statistical analysis identifies a cohort of genes that lack one or both androgen response elements (AREs) or vitamin D response elements (VDREs) in their promoters, which are nevertheless differentially regulated by both steroids (either additively or synergistically). This suggests that mechanisms in addition to VDR- and AR-mediated transcription are responsible for the modulation of gene expression. Microarray analysis shows that fifteen miRNAs are also differentially regulated by 1,25(OH)2D3 and T. Among these miR-22, miR-29ab, miR-134, miR-1207-5p and miR-371-5p are up regulated, while miR-17 and miR-20a, members of the miR-17/92 cluster are down regulated. A number of genes implicated in cell cycle progression, lipid synthesis and accumulation and calcium homeostasis are among the mRNA targets of these miRNAs. Thus, in addition to their well characterized effects on transcription, mediated by either or both cognate nuclear receptors, 1,25(OH)2D3 and T regulate the steady state mRNA levels by modulating miRNA-mediated mRNA degradation, generating attenuation feedback loops that result in global changes in mRNA and protein levels. Changes in genes involved in calcium homeostasis may have specific clinical importance since the second messenger Ca2+ is known to modulate various cellular processes, including cell proliferation, cell death and cell motility, which affects prostate cancer tumor progression and responsiveness to therapy. Conclusions These data indicate that these two hormones combine to drive a differentiated phenotype, and reinforce the idea that the age dependent decline in both hormones results in the de-differentiation of prostate tumor cells, which results in increased proliferation, motility and invasion common to aggressive tumors. These studies also reinforce the potential importance of miRNAs in prostate cancer progression and therapeutic outcomes.
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Affiliation(s)
- Wei-Lin W Wang
- Department of Biomedical Sciences, University at Albany, State University of New York, Albany, NY 12222, USA
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Gagnepain J, Moulin E, Nevado C, Waser M, Maier A, Kelter G, Fiebig HH, Fürstner A. Molecular Editing and Assessment of the Cytotoxic Properties of Iejimalide and Progeny. Chemistry 2011; 17:6973-84. [DOI: 10.1002/chem.201100180] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2011] [Indexed: 01/21/2023]
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Gagnepain J, Moulin E, Fürstner A. Gram-Scale Synthesis of Iejimalide B. Chemistry 2011; 17:6964-72. [DOI: 10.1002/chem.201100178] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2011] [Indexed: 02/03/2023]
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Moulin E, Nevado C, Gagnepain J, Kelter G, Fiebig HH, Fürstner A. Synthesis and evaluation of an Iejimalide-archazolid chimera. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.05.043] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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McHenry P, Wang WLW, Devitt E, Kluesner N, Davisson VJ, McKee E, Schweitzer D, Helquist P, Tenniswood M. Iejimalides A and B inhibit lysosomal vacuolar H+-ATPase (V-ATPase) activity and induce S-phase arrest and apoptosis in MCF-7 cells. J Cell Biochem 2010; 109:634-42. [PMID: 20039309 DOI: 10.1002/jcb.22438] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Iejimalides are novel macrolides that are cytostatic or cytotoxic against a wide range of cancer cells at low nanomolar concentrations. A recent study by our laboratory characterized the expression of genes and proteins that determine the downstream effects of iejimalide B. However, little is known about the cellular target(s) of iejimalide or downstream signaling that lead to cell-cycle arrest and/or apoptosis. Iejimalides have been shown to inhibit the activity of vacuolar H(+)-ATPase (V-ATPase) in osteoclasts, but how this inhibition may lead to cell-cycle arrest and/or apoptosis in epithelial cells is not known. In this study, MCF-7 breast cancer cells were treated with iejimalide A or B and analyzed for changes in cell-cycle dynamics, apoptosis, lysosomal pH, cytoplasmic pH, mitochondrial membrane potential, and generation of reactive oxygen species. Both iejimalides A and B sequentially neutralize the pH of lysosomes, induce S-phase cell-cycle arrest, and trigger apoptosis in MCF-7 cells. Apoptosis occurs through a mechanism that involves oxidative stress and mitochondrial depolarization but not cytoplasmic acidification. These data confirm that iejimalides inhibit V-ATPase activity in the context of epithelial tumor cells, and that this inhibition may lead to a lysosome-initiated cell death process.
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Affiliation(s)
- Peter McHenry
- Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, South Bend, Indiana 46617, USA
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