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Hao F, Wang C, Sholy C, Cao M, Kang X. Strategy for Leukemia Treatment Targeting SHP-1,2 and SHIP. Front Cell Dev Biol 2021; 9:730400. [PMID: 34490276 PMCID: PMC8417302 DOI: 10.3389/fcell.2021.730400] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Accepted: 07/28/2021] [Indexed: 11/29/2022] Open
Abstract
Protein tyrosine phosphatases (PTPs) are modulators of cellular functions such as differentiation, metabolism, migration, and survival. PTPs antagonize tyrosine kinases by removing phosphate moieties from molecular signaling residues, thus inhibiting signal transduction. Two PTPs, SHP-1 and SHP-2 (SH2 domain-containing phosphatases 1 and 2, respectively) and another inhibitory phosphatase, SH2 domain-containing inositol phosphatase (SHIP), are essential for cell function, which is reflected in the defective phenotype of mutant mice. Interestingly, SHP-1, SHP-2, and SHIP mutations are identified in many cases of human leukemia. However, the impact of these phosphatases and their mutations regarding the onset and progression of leukemia is controversial. The ambiguity of the role of these phosphatases imposes challenges on the development of targeting therapies for leukemia. This fundamental problem, confronted by the expanding investigational field of leukemia, will be addressed in this review, which will include a discussion of the molecular mechanisms of SHP-1, SHP-2, and SHIP in normal hematopoiesis and their role in leukemia. Clinical development of leukemic therapies achieved by targeting these phosphatases will be addressed as well.
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Affiliation(s)
- Fang Hao
- Center for Precision Medicine, Department of Medicine, University of Missouri, Columbia, MO, United States
| | - Chen Wang
- Center for Precision Medicine, Department of Medicine, University of Missouri, Columbia, MO, United States
| | - Christine Sholy
- Center for Precision Medicine, Department of Medicine, University of Missouri, Columbia, MO, United States
| | - Min Cao
- Center for Precision Medicine, Department of Medicine, University of Missouri, Columbia, MO, United States
| | - Xunlei Kang
- Center for Precision Medicine, Department of Medicine, University of Missouri, Columbia, MO, United States
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2
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Mycielska ME, Mohr MTJ, Schmidt K, Drexler K, Rümmele P, Haferkamp S, Schlitt HJ, Gaumann A, Adamski J, Geissler EK. Potential Use of Gluconate in Cancer Therapy. Front Oncol 2019; 9:522. [PMID: 31275855 PMCID: PMC6593216 DOI: 10.3389/fonc.2019.00522] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Accepted: 05/30/2019] [Indexed: 12/12/2022] Open
Abstract
We have recently discovered that cancer cells take up extracellular citrate through plasma membrane citrate transporter (pmCiC) and advantageously use citrate for their metabolism. Citrate uptake can be blocked with gluconate and this results in decreased tumor growth and altered metabolic characteristics of tumor tissue. Interestingly, gluconate, considered to be physiologically neutral, is incidentally used in medicine as a cation carrier, but not as a therapeutically active substance. In this review we discuss the results of our recent research with available literature and suggest that gluconate may be useful in the treatment of cancer.
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Affiliation(s)
- Maria E Mycielska
- Section of Experimental Surgery, Department of Surgery, University Hospital Regensburg, Regensburg, Germany
| | - Markus T J Mohr
- Metempyrosis-Data Analysis in Medicine and Information Technology, Regensburg, Germany
| | - Katharina Schmidt
- Section of Experimental Surgery, Department of Surgery, University Hospital Regensburg, Regensburg, Germany
| | - Konstantin Drexler
- Department of Dermatology, University Hospital Regensburg, Regensburg, Germany
| | - Petra Rümmele
- Institute of Pathology, University Hospital Erlangen, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany
| | - Sebastian Haferkamp
- Department of Dermatology, University Hospital Regensburg, Regensburg, Germany
| | - Hans J Schlitt
- Section of Experimental Surgery, Department of Surgery, University Hospital Regensburg, Regensburg, Germany
| | - Andreas Gaumann
- Institute of Pathology Kaufbeuren-Ravensburg, Kaufbeuren, Germany
| | - Jerzy Adamski
- Molecular Endocrinology and Metabolism, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany.,Lehrstuhl Für Experimentelle Genetik, Technische Universität München, Munich, Germany.,Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Edward K Geissler
- Section of Experimental Surgery, Department of Surgery, University Hospital Regensburg, Regensburg, Germany
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Nakahara R, Makino J, Kamiya T, Hara H, Adachi T. Caffeic acid phenethyl ester suppresses monocyte adhesion to the endothelium by inhibiting NF-κB/NOX2-derived ROS signaling. J Clin Biochem Nutr 2016; 58:174-9. [PMID: 27257341 PMCID: PMC4865596 DOI: 10.3164/jcbn.15-94] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Accepted: 12/23/2015] [Indexed: 01/17/2023] Open
Abstract
Caffeic acid phenethyl ester (CAPE), one of the major polyphenols, exhibits anti-oxidative, anti-bacterial, and anti-cancer properties. Atherosclerosis is a chronic inflammatory disease, the progression of which is closely related to the accumulated adhesion of inflammatory monocytes/macrophages to the endothelium. We herein determined whether CAPE and its derivatives suppressed THP-1 cell adhesion to human umbilical vein endothelial cells (HUVEC). Of the four polyphenols tested, CAPE significantly suppressed the 12-O-tetradecanoylphorbol 13-acetate (TPA)-elicited expression of cluster for differentiation (CD) 11b, 14, and 36, and this was accompanied by the inhibition of THP-1 cell adhesion to HUVEC. CAPE also suppressed the activation of TPA-elicited nuclear factor-κB (NF-κB) and accumulation of NADPH oxidase 2 (NOX2)-derived reactive oxygen species (ROS), but did not affect extracellular signal-regulated kinase (ERK) phosphorylation. Taken together, these results demonstrated that CAPE suppressed THP-1 cell adhesion to HUVEC through, at least in part, the NF-κB, NOX2, and ROS-derived signaling axis.
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Affiliation(s)
- Risa Nakahara
- Laboratory of Clinical Pharmaceutics, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Junya Makino
- Laboratory of Clinical Pharmaceutics, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Tetsuro Kamiya
- Laboratory of Clinical Pharmaceutics, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Hirokazu Hara
- Laboratory of Clinical Pharmaceutics, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Tetsuo Adachi
- Laboratory of Clinical Pharmaceutics, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
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Chauhan HPS, Joshi S, Bakshi A, Carpenter J. Structural investigation on toluene-3,4-dithiolatoantimony(iii) alkyldithiocarbonate complexes: thermal, powder XRD and biological studies. NEW J CHEM 2015. [DOI: 10.1039/c4nj02094d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
On thermal decomposition of the mixed sulfur donor antimony(iii) complexes, we obtained antimony sulfide at 600 °C, which was confirmed by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX).
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Affiliation(s)
| | - Sapana Joshi
- School of Chemical Sciences
- Devi Ahilya University
- Indore – 452001
- India
| | - Abhilasha Bakshi
- School of Chemical Sciences
- Devi Ahilya University
- Indore – 452001
- India
| | - Jaswant Carpenter
- School of Chemical Sciences
- Devi Ahilya University
- Indore – 452001
- India
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5
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Han A, Ozturk I, Banti C, Kourkoumelis N, Manoli M, Tasiopoulos A, Owczarzak A, Kubicki M, Hadjikakou S. Antimony(III) halide compounds of thioureas: Structures and biological activity. Polyhedron 2014. [DOI: 10.1016/j.poly.2014.05.014] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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6
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Kamiya T, Machiura M, Makino J, Hara H, Hozumi I, Adachi T. Epigenetic regulation of extracellular-superoxide dismutase in human monocytes. Free Radic Biol Med 2013; 61:197-205. [PMID: 23602908 DOI: 10.1016/j.freeradbiomed.2013.04.013] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2012] [Revised: 03/13/2013] [Accepted: 04/10/2013] [Indexed: 11/30/2022]
Abstract
Extracellular-superoxide dismutase (EC-SOD) is a major SOD isozyme mainly present in the vascular wall and plays an important role in normal redox homeostasis. We previously showed the significant reduction or induction of EC-SOD during human monocytic U937 or THP-1 cell differentiation induced by 12-O-tetradecanoylphorbol-13-acetate (TPA), respectively; however, its cell-specific expression and regulation have not been fully elucidated. It has been reported that epigenetic factors, such as DNA methylation and histone modification, are involved in several kinds of gene regulation. In this study, we investigated the involvement of epigenetic factors in EC-SOD expression and determined high levels of DNA methylation within promoter and coding regions of EC-SOD in THP-1 cells compared to those in U937 cells. Moreover, treatment with a DNA methyltransferase inhibitor, 5-azacytidine, significantly induced the expression of EC-SOD in THP-1 cells, indicating the importance of DNA methylation in the suppression of EC-SOD expression; however, the DNA methylation status did not change during THP-1 cell differentiation induced by TPA. On the other hand, we detected histone H3 and H4 acetylation during differentiation. Further, pretreatment with histone acetyltransferase inhibitors, CPTH2 or garcinol, significantly suppressed the TPA-inducible EC-SOD expression. We also determined the epigenetic suppression of EC-SOD in peripheral blood mononuclear cells. Treatment with granulocyte macrophage colony-stimulating factor (GM-CSF)/granulocyte-CSF induced that expression. Overall, these findings provide novel evidence that cell-specific and TPA-inducible EC-SOD expression are regulated by DNA methylation and histone H3 and H4 acetylation in human monocytic cells.
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Affiliation(s)
- Tetsuro Kamiya
- Laboratory of Clinical Pharmaceutics, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan.
| | - Masatomo Machiura
- Laboratory of Clinical Pharmaceutics, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Junya Makino
- Laboratory of Clinical Pharmaceutics, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Hirokazu Hara
- Laboratory of Clinical Pharmaceutics, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Isao Hozumi
- Laboratory of Medical Therapeutics and Molecular Therapeutics, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Tetsuo Adachi
- Laboratory of Clinical Pharmaceutics, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
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7
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Makino J, Nakanishi R, Kamiya T, Hara H, Ninomiya M, Koketsu M, Adachi T. Luteolin suppresses the differentiation of THP-1 cells through the Inhibition of NOX2 mRNA expression and the membrane translocation of p47phox. JOURNAL OF NATURAL PRODUCTS 2013; 76:1285-1290. [PMID: 23786520 DOI: 10.1021/np400224w] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Luteolin (1), a natural product occurring in many vegetables and fruits, is known to have several biological activities. Cluster for differentiation (CD) families, such as CD11b, -14, and -36, are expressed during pathological processes of atherosclerosis and are used broadly as markers of monocytic differentiation into macrophages. Herein, it was investigated whether 1 and three other flavonoids [chrysin (2), apigenin (3), and tricetin (4)] blocked 12-O-tetradecanoylphorbol 13-acetate (TPA)-triggered induction of CD families, which were induced through the activation of protein kinase C (PKC), mitogen-activated protein kinase (MEK)/extracellular signal-regulated kinase (ERK), and NADPH oxidase (NOX)-derived reactive oxygen species (ROS). When compared to flavonoids 2-4, 1 blocked TPA-triggered induction of CD families and cell adherence of monocytic THP-1 cells. Luteolin completely blocked intracellular ROS generation, whereas it did not inhibit MEK/ERK phosphorylation. Moreover, pretreatment with 1 suppressed TPA-triggered induction of NOX2 and membrane translocation of p47(phox). Overall, it is revealed that 1 suppresses TPA-triggered induction of CD families by the prevention of NOX2 activation.
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Affiliation(s)
- Junya Makino
- Laboratory of Clinical Pharmaceutics, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
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8
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Yi T, Elson P, Mitsuhashi M, Jacobs B, Hollovary E, Budd TG, Spiro T, Triozzi P, Borden EC. Phosphatase inhibitor, sodium stibogluconate, in combination with interferon (IFN) alpha 2b: phase I trials to identify pharmacodynamic and clinical effects. Oncotarget 2012; 2:1155-64. [PMID: 22201704 DOI: 10.18632/oncotarget.393] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Since sodium stibogluconate (SSG) inhibited phosphatases including SHP-1 and augmented anti-tumor actions of IFN-α2b in vitro and in mice, two Phase I trials of SSG/IFN-α2b combination were undertaken to evaluate safety and target inhibition. Escalating doses of SSG (200-1200 mg/m2) and fixed doses of IFN-α2b (3x106 units/m2) with or without chemotherapy (dacarbazine, vinblastine, cisplatin) were evaluated for side effects and impact on SHP-1 phospho-substrates and IFNα-stimulated-genes (ISGs) in peripheral blood in 40 patients with metastatic melanoma, soft tissue sarcomas, gastrointestinal stromal tumors, and breast or colorectal carcinomas who did not have other established treatment options. Common adverse events were bone marrow suppression, fatigue, gastrointestinal upset, and asymptomatic lipase elevation (n=13); the latter was dose related and mostly after 10d of SSG/IFN-α2b in combination. Levels of SHP-1 substrates (pSTAT1, pSTAT3, pLck and pSlp76) were increased (up to 3x) in peripheral blood cells following SSG with no potentiation by combination with IFN-α2b. Representative ISGs in peripheral blood were induced after IFN-α2b at 4 and 24 hrs with selective modulations by combination. The median time on trials was 2.3 months (10-281d) with no objective regression of disease. Alive at 1y were 17/40 (43%) patients and after 2y were 8/40 (20%) following treatment initiation. These data demonstrate that SSG impacted signal molecules consistent with PTP inhibition and was tolerated in combination with IFN-α2b. Phase II investigations of SSG could safely utilize doses of up to 1200 mg/m2 of SSG for up to 10d alone or in combination with IFN-α2b with or without chemotherapy.
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Affiliation(s)
- Taolin Yi
- Taussig Cancer Institute, The Cleveland Clinic, Cleveland, OH, USA
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9
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Makino J, Kamiya T, Hara H, Adachi T. TPA induces the expression of EC-SOD in human monocytic THP-1 cells: Involvement of PKC, MEK/ERK and NOX-derived ROS. Free Radic Res 2012; 46:637-44. [DOI: 10.3109/10715762.2012.664841] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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10
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Yi T, Elson P, Mitsuhashi M, Jacobs B, Hollovary E, Budd GT, Spiro T, Triozzi P, Borden EC. Phosphatase inhibitor, sodium stibogluconate, in combination with interferon (IFN) alpha 2b: phase I trials to identify pharmacodynamic and clinical effects. Oncotarget 2011; 2:1155-1164. [PMID: 22201704 PMCID: PMC3282074 DOI: 10.18632/oncotarget.563] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2011] [Accepted: 12/21/2011] [Indexed: 12/27/2022] Open
Abstract
Since sodium stibogluconate (SSG) inhibited phosphatases including SHP-1 and augmented anti-tumor actions of IFN-α2b in vitro and in mice, two Phase I trials of SSG/IFN-α2b combination were undertaken to evaluate safety and target inhibition. Escalating doses of SSG (200-1200 mg/m2) and fixed doses of IFN-α2b (3x106 units/m2) with or without chemotherapy (dacarbazine, vinblastine, cisplatin) were evaluated for side effects and impact on SHP-1 phospho-substrates and IFNα-stimulated-genes (ISGs) in peripheral blood in 40 patients with metastatic melanoma, soft tissue sarcomas, gastrointestinal stromal tumors, and breast or colorectal carcinomas who did not have other established treatment options. Common adverse events were bone marrow suppression, fatigue, gastrointestinal upset, and asymptomatic lipase elevation (n=13); the latter was dose related and mostly after 10d of SSG/IFN-α2b in combination. Levels of SHP-1 substrates (pSTAT1, pSTAT3, pLck and pSlp76) were increased (up to 3x) in peripheral blood cells following SSG with no potentiation by combination with IFN-α2b. Representative ISGs in peripheral blood were induced after IFN-α2b at 4 and 24 hrs with selective modulations by combination. The median time on trials was 2.3 months (10-281d) with no objective regression of disease. Alive at 1y were 17/40 (43%) patients and after 2y were 8/40 (20%) following treatment initiation. These data demonstrate that SSG impacted signal molecules consistent with PTP inhibition and was tolerated in combination with IFN-α2b. Phase II investigations of SSG could safely utilize doses of up to 1200 mg/m2 of SSG for up to 10d alone or in combination with IFN-α2b with or without chemotherapy.
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Affiliation(s)
- Taolin Yi
- Taussig Cancer Institute, The Cleveland Clinic, Cleveland, OH, USA
- Department of Immunology of Lerner Research Institute, The Cleveland Clinic, Cleveland, OH, USA
| | - Paul Elson
- Taussig Cancer Institute, The Cleveland Clinic, Cleveland, OH, USA
| | | | - Barbara Jacobs
- Taussig Cancer Institute, The Cleveland Clinic, Cleveland, OH, USA
| | - Emese Hollovary
- Taussig Cancer Institute, The Cleveland Clinic, Cleveland, OH, USA
| | - G. Thomas Budd
- Taussig Cancer Institute, The Cleveland Clinic, Cleveland, OH, USA
| | - Timothy Spiro
- Taussig Cancer Institute, The Cleveland Clinic, Cleveland, OH, USA
| | - Pierre Triozzi
- Taussig Cancer Institute, The Cleveland Clinic, Cleveland, OH, USA
| | - Ernest C. Borden
- Taussig Cancer Institute, The Cleveland Clinic, Cleveland, OH, USA
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Haldar AK, Sen P, Roy S. Use of antimony in the treatment of leishmaniasis: current status and future directions. Mol Biol Int 2011; 2011:571242. [PMID: 22091408 PMCID: PMC3196053 DOI: 10.4061/2011/571242] [Citation(s) in RCA: 215] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2011] [Accepted: 03/05/2011] [Indexed: 01/05/2023] Open
Abstract
In the recent past the standard treatment of kala-azar involved the use of pentavalent antimonials Sb(V). Because of progressive rise in treatment failure to Sb(V) was limited its use in the treatment program in the Indian subcontinent. Until now the mechanism of action of Sb(V) is not very clear. Recent studies indicated that both parasite and hosts contribute to the antimony efflux mechanism. Interestingly, antimonials show strong immunostimulatory abilities as evident from the upregulation of transplantation antigens and enhanced T cell stimulating ability of normal antigen presenting cells when treated with Sb(V) in vitro. Recently, it has been shown that some of the peroxovanadium compounds have Sb(V)-resistance modifying ability in experimental infection with Sb(V) resistant Leishmania donovani isolates in murine model. Thus, vanadium compounds may be used in combination with Sb(V) in the treatment of Sb(V) resistance cases of kala-azar.
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Affiliation(s)
- Arun Kumar Haldar
- Division of Infectious Diseases and Immunology, Indian Institute of Chemical Biology, Council of Scientific and Industrial Research, 4 Raja S. C. Mullick Road, Kolkata West Bengal 700032, India
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12
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Kamiya T, Makino J, Hara H, Inagaki N, Adachi T. Extracellular-superoxide dismutase expression during monocytic differentiation of U937 cells. J Cell Biochem 2011; 112:244-55. [DOI: 10.1002/jcb.22917] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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13
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Sharma P, Perez D, Cabrera A, Rosas N, Arias JL. Perspectives of antimony compounds in oncology. Acta Pharmacol Sin 2008; 29:881-90. [PMID: 18664320 DOI: 10.1111/j.1745-7254.2008.00818.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Antimony, a natural element that has been used as a drug for over more than 100 years, has remarkable therapeutic efficacy in patients with acute promyelocytic leukemia. This review focuses on recent advances in developing antimony anticancer agents with an emphasis on antimony coordination complexes, Sb (III) and Sb (V). These complexes, which include many organometallic complexes, may provide a broader spectrum of antitumoral activity. They were compared with classical platinum anticancer drugs. The review covers the literature data published up to 2007. A number of antimonials with different antitumoral activities are known and have diverse applications, even though little research has been done on their possibilities. It might be feasible to develop more specific and effective inhibitors for phosphatase-targeted, anticancer therapeutics through the screening of sodium stibogluconate (SSG) and potassium antimonyltartrate-related compounds, which are comprised of antimony conjugated to different organic moieties. For example, SSG appears to be a better inhibitor than suramin which is a compound known for its antineoplastic activity against several types of cancers.
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Affiliation(s)
- Pankaj Sharma
- Instituto De Química, UNAM Circuito Exterior, Coyoacan México DF.04510, Mexico.
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14
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Li J, Lindner DJ, Farver C, Borden EC, Yi T. Efficacy of SSG and SSG/IFNalpha2 against human prostate cancer xenograft tumors in mice: a role for direct growth inhibition in SSG anti-tumor action. Cancer Chemother Pharmacol 2006; 60:341-9. [PMID: 17103170 DOI: 10.1007/s00280-006-0378-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2006] [Accepted: 10/23/2006] [Indexed: 11/30/2022]
Abstract
BACKGROUND Pre-clinical activity of SSG against melanoma and renal cancer has been identified recently although the drug's mechanism of action and activity against tumors of additional histological-types remain undefined. METHODS The effects of SSG and SSG combination with other agents on DU145 human prostate carcinoma xenograft tumors in mice and on DU145 cell subpopulations of differential SSG sensitivities were evaluated. RESULTS DU145 tumor growth was inhibited by SSG (69%), IFNalpha2 (33%) or the combination (80%) that induced complete regression of WM9 human melanoma tumors. DU145 cells in culture were also partially growth inhibited by SSG at killing doses (200-800 mug/ml) for WM9 cells, indicating a correlation of SSG inhibition of cancer cell growth in vitro and in vivo. DU145 cells formed multiple micro tumors in mice treated with SSG or SSG/IFNalpha2 in contrast to the single large tumors in the control or IFNalpha2-treated mice, suggesting the existence of an SSG-resistant subpopulation in DU145 cells. Indeed, DU145 but not WM9 cells formed colonies (approximately 4% frequency) when cultured in the presence of SSG. Single cell clone (DU145-7) isolated from DU145 cells showed SSG-resistant growth in culture, unassociated with cross-resistance to IFNalpha2 and converted to SSG-responsive cells by BSO that inhibited intracellular glutathione levels. CONCLUSIONS These results implicate a role for direct growth inhibition in SSG anti-tumor action, provide novel insights into the mechanism of tumor resistance to the drug and suggest a therapeutic potential for SSG and its combinations with IFNalpha2 or BSO for prostate cancer that warrants further investigation.
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Affiliation(s)
- Jing Li
- Department of Cancer Biology, Lerner Research Institute, The Cleveland Clinic, 9500 Euclid Avenue, NB4-67, Cleveland, OH 44195, USA
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Wyllie S, Fairlamb AH. Differential toxicity of antimonial compounds and their effects on glutathione homeostasis in a human leukaemia monocyte cell line. Biochem Pharmacol 2005; 71:257-67. [PMID: 16318845 DOI: 10.1016/j.bcp.2005.10.043] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2005] [Revised: 10/25/2005] [Accepted: 10/26/2005] [Indexed: 11/15/2022]
Abstract
Trivalent antimonial compounds (Sb(III)), originally used in the treatment of leishmaniasis, are now being proposed as a novel therapy for acute promyelocytic leukaemia (APL). Here, we examine the effects of Sb(III) and pentavalent antimonial drugs (Sb(V)) on glutathione homeostasis, oxidative stress and apoptosis in the human leukaemia monocyte cell line, THP-1. Although growth of THP-1 macrophages is unaffected by Sb(V), macrophages are extremely sensitive to Sb(III). On exposure to Sb(III), intracellular free glutathione (GSH) levels in macrophages decrease linearly by 50% over 4h, associated with efflux of both GSH and accumulation of intracellular glutathione disulphide (GSSG). Together these effects increase the redox potential of the GSSG/GSH couple from -282 to -225mV. Sb(III)-induced GSH efflux from THP-1 macrophages is accompanied by the concomitant efflux of Sb(III) at a constant molar ratio of 3 (GSH) to 1 (Sb(III)), respectively. Sb(III) directly inhibits glutathione reductase activity in macrophages, significantly retarding the regeneration of GSH from GSSG, following diamide oxidation. Sb(III)-treated THP-1 macrophages go on to exhibit elevated levels of reactive oxygen species and show the early signs of apoptosis. The absence of these effects in Sb(V)-treated THP-1 cells suggests that macrophages do not efficiently reduce Sb(V) to Sb(III). Collectively, these findings suggest that Sb(III) seriously compromises thiol homeostasis in THP-1 macrophages and that this may be an early defining event in the mode of action of antimonials against leukaemia cells.
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Affiliation(s)
- Susan Wyllie
- Division of Biological Chemistry and Molecular Biology, Wellcome Trust Biocentre, School of Life Sciences, University of Dundee, Dundee, DD1 5EH Scotland, UK
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