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Sarfraz M, Nasim MJ, Gruhlke MCH, Handzlik J, Jacob C. To Cut the Mustard: Antimicrobial Activity of Selenocyanates on the Plate and in the Gas Phase. Antibiotics (Basel) 2023; 12:antibiotics12020290. [PMID: 36830201 PMCID: PMC9952309 DOI: 10.3390/antibiotics12020290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Revised: 01/26/2023] [Accepted: 01/28/2023] [Indexed: 02/04/2023] Open
Abstract
Organic selenocyanates (RSeCN) are among the most reactive and biologically active Se species, often exhibiting a pronounced cytotoxic activity against mammalian cells and microorganisms. Various aromatic selenocyanates have been synthesized and, similar to some of the most Reactive Sulfur Species (RSS), such as allicin, found to be active against a range of bacteria, including Escherichia coli, Pseudomonas syringae and Micrococcus luteus, and fungi, including Verticillium dahlia, Verticillium longisporum, Alternaria brassicicola, and Botrytis cinerea, even via the gas phase. The highest antimicrobial activity has been observed for benzyl selenocyanate, which inhibited the growth of all bacteria considerably, even at the lowest tested concentration of 50 µM. Notably, neither the analogues thiocyanate (BTC) nor isothiocyanate (BITC) show any of these activities, rendering this selenium motif rather special in activity and mode of action. Eventually, these findings advocate a range of potential applications of organic selenocyanates in medicine and agriculture.
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Affiliation(s)
- Muhammad Sarfraz
- Department of Plant Physiology, RWTH Aachen University, Worringer Weg 1, 52056 Aachen, Germany
- Division of Bioorganic Chemistry, Saarland University, Campus B2 1, 66123 Saarbruecken, Germany
| | - Muhammad Jawad Nasim
- Division of Bioorganic Chemistry, Saarland University, Campus B2 1, 66123 Saarbruecken, Germany
- Correspondence: (M.J.N.); (C.J.); Tel.: +49-681-302-57335 (M.J.N.); +49-681-302-3129 (C.J.)
| | - Martin C. H. Gruhlke
- Department of Plant Physiology, RWTH Aachen University, Worringer Weg 1, 52056 Aachen, Germany
| | - Jadwiga Handzlik
- Department of Technology and Biotechnology of Drugs, Faculty of Pharmacy, Jagiellonian University Medical College in Kraków, Medyczna 9, 30-688 Cracow, Poland
| | - Claus Jacob
- Division of Bioorganic Chemistry, Saarland University, Campus B2 1, 66123 Saarbruecken, Germany
- Correspondence: (M.J.N.); (C.J.); Tel.: +49-681-302-57335 (M.J.N.); +49-681-302-3129 (C.J.)
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Liu S, Ding W, Huang W, Zhang Z, Guo Y, Zhang Q, Wu L, Li Y, Qin R, Li J, Shi T, Zhang X, Lei J, Hu W. Discovery of Novel Benzo[4,5]imidazo[1,2- a]pyrazin-1-amine-3-amide-one Derivatives as Anticancer Human A 2A Adenosine Receptor Antagonists. J Med Chem 2022; 65:8933-8947. [PMID: 35714367 DOI: 10.1021/acs.jmedchem.2c00101] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The blockade of A2A adenosine receptor (A2AAR) activates immunostimulatory response through regulating signaling in tumor microenvironment. Thus, A2AAR has been proposed as a promising target for cancer immunotherapy. In this work, we designed a new series of benzo[4,5]imidazo[1,2-a]pyrazin-1-amine derivatives bearing an amide substitution at 3-position to obtain potent antitumor antagonist in vivo. The structure-activity relationship studies were performed by molecular modeling and radioactive assay. The in vitro anticancer activities were evaluated by 3',5'-cyclic adenosine monophosphate (cAMP) functional and T cell activation assay. The most potent compound 12o·2HCl showed much higher affinity toward A2AAR (Ki = 0.08 nM) and exhibited more significant in vitro immunostimulatory anticancer activity than clinical antagonist AZD4635. More importantly, 12o·2HCl significantly inhibited the growth of triple-negative breast cancer by reversing immunosuppressive tumor microenvironment in the xenograft mouse model without severe toxicity at the testing dose. These results make 12o·2HCl a promising immunotherapy anticancer drug candidate.
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Affiliation(s)
- Shuhao Liu
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, P. R. China
| | - Wen Ding
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, P. R. China
| | - Weifeng Huang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, P. R. China
| | - Zhijing Zhang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, P. R. China
| | - Yinfeng Guo
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, P. R. China
| | - Qiyi Zhang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, P. R. China.,National-Local Joint Engineering Laboratory of Druggability and New Drug Evaluation, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, P. R. China
| | - Linna Wu
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, P. R. China
| | - Yukai Li
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, P. R. China
| | - Rui Qin
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, P. R. China
| | - Jiahao Li
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, P. R. China
| | - Taoda Shi
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, P. R. China
| | - Xiaolei Zhang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, P. R. China.,National-Local Joint Engineering Laboratory of Druggability and New Drug Evaluation, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, P. R. China
| | - Jinping Lei
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, P. R. China
| | - Wenhao Hu
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, P. R. China
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3
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Cao Y, Liu J, Liu F, Jiang L, Yi W. Copper-catalyzed direct and odorless selenylation with a sodium selenite-based reagent. Org Chem Front 2019. [DOI: 10.1039/c8qo01355a] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Use of a new odorless, shelf-stable, easy to handle, practical and scalable direct selenylation reagent, NaO2SeR, has been disclosed.
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Affiliation(s)
- Yuan Cao
- School of Chemical Engineering
- Nanjing University of Science and Technology
- Nanjing
- China
| | - Jie Liu
- School of Chemical Engineering
- Nanjing University of Science and Technology
- Nanjing
- China
| | - Fanmin Liu
- School of Chemical Engineering
- Nanjing University of Science and Technology
- Nanjing
- China
| | - Lvqi Jiang
- School of Chemical Engineering
- Nanjing University of Science and Technology
- Nanjing
- China
| | - Wenbin Yi
- School of Chemical Engineering
- Nanjing University of Science and Technology
- Nanjing
- China
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4
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Nasim MJ, Witek K, Kincses A, Abdin AY, Żesławska E, Marć MA, Gajdács M, Spengler G, Nitek W, Latacz G, Karczewska E, Kieć-Kononowicz K, Handzlik J, Jacob C. Pronounced activity of aromatic selenocyanates against multidrug resistant ESKAPE bacteria. NEW J CHEM 2019. [DOI: 10.1039/c9nj00563c] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Selenocyanates demonstrate pronounced activity against bacteria of the ESKAPE family, yeast and nematodes with limited cytotoxicity against human cells.
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Abstract
A new and simple procedure mediated by I2 is developed for the preparation of 4-selanylpyrazoles from pyrazoles and diselenides.
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Affiliation(s)
- Junxing Wang
- College of Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310032
- P. R. China
| | - Yuhong Liu
- College of Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310032
- P. R. China
| | - Jie Yan
- College of Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310032
- P. R. China
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6
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Zhang Y, Wu S, Yan J. PhI Catalyzed Acetoxyselenylation and Formyloxyselenylation of Alkenes. Helv Chim Acta 2017. [DOI: 10.1002/hlca.201600306] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yikun Zhang
- College of Chemical Engineering; Zhejiang University of Technology; Hangzhou 310032 P. R. China
| | - Sixue Wu
- College of Chemical Engineering; Zhejiang University of Technology; Hangzhou 310032 P. R. China
| | - Jie Yan
- College of Chemical Engineering; Zhejiang University of Technology; Hangzhou 310032 P. R. China
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Wang X, Li H, Zhu M, Yan J. Convenient iodine-mediated aminoselenation of alkenes using benzotriazoles as nitrogen sources. RSC Adv 2017. [DOI: 10.1039/c6ra27202a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Convenient iodine-mediated alkene aminoselenation using benzotriazoles as nitrogen sources.
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Affiliation(s)
- Xiaolong Wang
- College of Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310032
- P. R. China
| | - Hongjie Li
- College of Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310032
- P. R. China
| | - Min Zhu
- College of Biological and Environmental Sciences
- Zhejiang Shuren University
- Hangzhou 310015
- P. R. China
| | - Jie Yan
- College of Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310032
- P. R. China
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8
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Affiliation(s)
- Yikun Zhang
- College of Chemical Engineering; Zhejiang University of Technology; Hangzhou 310032 P. R. China
| | - Sixue Wu
- College of Chemical Engineering; Zhejiang University of Technology; Hangzhou 310032 P. R. China
| | - Jie Yan
- College of Chemical Engineering; Zhejiang University of Technology; Hangzhou 310032 P. R. China
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9
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Shi HW, Yu C, Yan J. Potassium bromide or sodium chloride catalyzed acetoxyselenenylation of alkenes with diselenides and mCPBA. CHINESE CHEM LETT 2015. [DOI: 10.1016/j.cclet.2015.05.029] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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10
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Pagano E, Laudato M, Griffo M, Capasso R. Phytotherapy of benign prostatic hyperplasia. A minireview. Phytother Res 2014; 28:949-55. [PMID: 25165780 DOI: 10.1002/ptr.5084] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Benign prostate hyperplasia (BPH) is a common condition affecting older men, with an incidence that is age-dependent. Histological BPH, which typically develops after the age of 40 years, ranges in prevalence from >50% at 60 years to as high as 90% by 85 years of age. Typical symptoms include increased frequency of urination, nocturia, urgency, hesitancy, and weak urine stream. Conventional medicines used for the treatment of BPH include alpha blockers and 5-alpha reductase inhibitors. This articles review the mode of action, the efficacy, and the safety, including herb-drug interactions of the most common botanicals (Serenoa repens, Pygeum africanum, Urtica dioica, and Cucurbita pepo) and nutraceuticals (isoflavones, lycopene, selenium, and β-Sitosterol) in controlling the lower urinary tract symptoms associated to BPH.
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11
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Erkekoglu P, Chao MW, Ye W, Ge J, Trudel LJ, Skipper PL, Kocer-Gumusel B, Engelward BP, Wogan GN, Tannenbaum SR. Cytoplasmic and nuclear toxicity of 3,5-dimethylaminophenol and potential protection by selenocompounds. Food Chem Toxicol 2014; 72:98-110. [DOI: 10.1016/j.fct.2014.06.031] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Revised: 06/02/2014] [Accepted: 06/30/2014] [Indexed: 01/20/2023]
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12
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Toxicology and pharmacology of selenium: emphasis on synthetic organoselenium compounds. Arch Toxicol 2011; 85:1313-59. [DOI: 10.1007/s00204-011-0720-3] [Citation(s) in RCA: 330] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2011] [Accepted: 05/18/2011] [Indexed: 02/07/2023]
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13
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Kandaş NO, Randolph C, Bosland MC. Differential effects of selenium on benign and malignant prostate epithelial cells: stimulation of LNCaP cell growth by noncytotoxic, low selenite concentrations. Nutr Cancer 2009; 61:251-64. [PMID: 19235042 DOI: 10.1080/01635580802398430] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
We examined the hypothesis that nontoxic concentrations of selenium induce apoptosis and growth inhibition selectively in prostate cancer cells but not in benign prostate cells. Nontumorigenic BPH-1 prostate epithelial cells, androgen-sensitive LNCaP, and androgen-independent PC-3 prostate cancer cells were exposed to sodium selenite at 1 to 10 micromol/l for 24 to 72 h. Cell proliferation, viability, and apoptosis were assessed by MTT assay, trypan blue exclusion, flow cytometry, DNA laddering, and caspase activation. BPH-1 cells were more sensitive for cytotoxic selenium effects than malignant prostate cells, whereas LNCaP cells were more sensitive than PC-3 cells. At noncytotoxic selenium concentrations, there was no apoptosis in BPH-1 and PC-3 cells and no growth inhibition of LNCaP and BPH-1 cells. PC-3 cells were refractory to apoptosis induction but were growth inhibited at noncytotoxic concentrations. LNCaP cells were growth stimulated at 1 micromol/l and sensitive to apoptosis induction at higher noncytotoxic concentrations. Thus, noncytotoxic selenite concentrations did not induce growth inhibition or apoptosis selectively in prostate cancer cells. Growth stimulation of LNCaP cells by low concentrations suggests the possibility of adverse effects of selenium supplementation on hormone sensitive prostate cancer, whereas inhibition of PC-3 cell proliferation at noncytotoxic concentrations suggests potential benefit of selenium in advanced prostate cancer.
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Affiliation(s)
- Nur Ozten Kandaş
- Department of Pathology, University of Illinois at Chicago, 840 South Wood Street, Chicago, IL 60612, USA
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14
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Peters U, Takata Y. Selenium and the prevention of prostate and colorectal cancer. Mol Nutr Food Res 2009; 52:1261-72. [PMID: 18763256 DOI: 10.1002/mnfr.200800103] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Prostate and colorectal cancers are among the most common cancers and identifying modifiable risk factors are important steps to reduce the burden of these severe diseases. Results from several but mostly small observational studies as well as the secondary analysis of an intervention trial provide support for a chemopreventive effect of selenium on prostate and colorectal cancers. Results suggest effect modification by gender and smoking, but this interpretation is limited by the statistical power of previous studies. Several cancer preventive mechanisms have been described and it is likely that selenium acts through multiple pathways. In particular, the anti-oxidative and anti-inflammatory effects mediated through activity of selenoenzymes are discussed, given the relevance of oxidative stress and inflammation in these cancers. Genetic variation in selenoenzymes may modify the potential chemopreventive effect of selenium and need to be further investigated. Additional large observational studies using biomarkers of selenium intake and intervention trials, such as the Selenium and Vitamin E Cancer Prevention Trial, will be important to further evaluate the potential chemopreventive effect of selenium. Furthermore, characterization of functional effects of polymorphisms in selenoenzymes is needed.
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Affiliation(s)
- Ulrike Peters
- Department of Epidemiology, School of Public Health, University of Washington, Seattle, WA 98109-1024, USA.
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15
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Nogueira CW, Zeni G, Rocha JBT. Organoselenium and Organotellurium Compounds: Toxicology and Pharmacology. Chem Rev 2004; 104:6255-85. [PMID: 15584701 DOI: 10.1021/cr0406559] [Citation(s) in RCA: 1409] [Impact Index Per Article: 70.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Cristina W Nogueira
- Laboratório de Síntese, Reatividade e Avaliacão Farmacológica e Toxicológica de Organocalcogênios, CCNE, UFSM, Santa Maria, CEP 97105-900 Rio Grande do Sul, Brazil
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el-Bayoumy K, Rao CV, Reddy BS. Multiorgan sensitivity to anticarcinogenesis by the organoselenium 1,4-phenylenebis(methylene)selenocyanate. Nutr Cancer 2002; 40:18-27. [PMID: 11799918 DOI: 10.1207/s15327914nc401_6] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
The data in this report clearly indicate that the form (structure) in which selenium is used is the most critical determinant of success in future clinical trials. Synthetic organoselenium compounds can be tailored to achieve greater chemopreventive efficacy with minimal toxic side effects by structural modifications. We demonstrated that 1,4-phenylenebis(methylene)selenocyanate is a powerful chemopreventive agent against the development of experimental colon, mammary, lung, and oral carcinogenesis. On the basis of metabolism studies of organoselenium compounds and those reported in the literature, our working hypothesis is that aromatic selenol intermediates are important entities in cancer chemoprevention. In addition, we suggest that 1,4-phenylenebis(methylene)selenocyanate not only serves as a chemopreventive agent, but it may be valuable in preventing metastatic diseases in future studies in the clinic.
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Affiliation(s)
- K el-Bayoumy
- American Health Foundation, Valhalla, NY 10595, USA.
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Abstract
Zinc/thiolate (cysteine) coordination occurs in a very large number of proteins. These coordination sites are thermodynamically quite stable. Yet the redox chemistry of thiolate ligands confers extraordinary reactivities on these sites. The significance of such ligand-centered reactions is that they affect the binding and release of zinc, thus helping to distribute zinc, and perhaps controlling zinc-dependent cellular events. One new aspect focuses on the thiolate ligands of zinc as targets for the redox action of selenium compounds. A distinctive feature of this chemistry is the capacity of selenols to catalyze the oxidation of zinc/thiolate sites. We here use a chromophoric compound, 2-nitrophenylselenocyanate, to investigate its reaction mechanism with the zinc/thiolate clusters of metallothionein, a protein that is a cellular reservoir for zinc and together with its apoprotein, thionein, is involved in zinc distribution as a zinc donor/acceptor pair. The reaction is particularly revealing as it occurs in two steps. A selenenylsulfide intermediate is formed in the fast oxidative step, followed by the generation of 2-nitrophenylselenol that initiates the second, catalytic step. The findings demonstrate the high reactivity of selenium compounds with zinc/thiolate coordination sites and the potent catalytic roles that selenoproteins and selenium redox drugs may have in affecting gene expression via modulation of the zinc content of zinc finger proteins.
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Affiliation(s)
- Y Chen
- Center for Biochemical and Biophysical Sciences and Medicine, Harvard Medical School, Boston, MA 02115, USA
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18
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Chemical transformations of selenium in living organisms. Improved forms of selenium for cancer prevention. Tetrahedron 1997. [DOI: 10.1016/s0040-4020(97)00561-9] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Reddy BS, Rivenson A, El-Bayoumy K, Upadhyaya P, Pittman B, Rao CV. Chemoprevention of colon cancer by organoselenium compounds and impact of high- or low-fat diets. J Natl Cancer Inst 1997; 89:506-12. [PMID: 9086007 DOI: 10.1093/jnci/89.7.506] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND Observational and experimental studies have suggested that dietary supplementation with selenium can inhibit the development of colon cancer. However, many forms of selenium are toxic. Consequently, the development of efficacious compounds with low toxicity has been pursued. PURPOSE Two synthetic organoselenium compounds, p-methoxy-benzyl selenocyanate (p-methoxy-BSC) and 1,4-phenylenebis(methylene)selenocyanate (p-XSC), were tested for their ability to inhibit colon carcinogenesis in rats that were treated with the carcinogen azoxymethane and fed low- or high-fat diets. METHODS Groups of 5-week-old male F344 rats (42 animals/ group) were fed either a high-fat diet or a low-fat diet with or without added p-methoxy-BSC (10 or 20 parts per million [ppm]) or p-XSC (20 ppm). Two weeks later, 30 animals in each group received a subcutaneous injection of azoxymethane (15 mg/kg body weight); 1 week later, they received a second injection. The remaining 12 rats in each group received two injections of saline. Three days after the second injection of carcinogen or saline, animals being fed diets with p-methoxy-BSC or p-XSC were switched to corresponding organoselenium-free low- or high-fat diets for the remainder of the study to determine the effects of the selenium compounds on the initiation phase of colon carcinogenesis. At that time, groups of animals that had been maintained on organoselenium-free low- or high-fat diets were switched to diets containing p-methoxy-BSC or p-XSC until the end of the study to determine the effects of these compounds on the postinitiation phase of colon carcinogenesis. All animals were killed during the 38th week after azoxymethane or saline treatment, and histopathologic analysis of the colon tumors was performed. Colon tumor incidence and multiplicity were analyzed statistically. RESULTS No obvious toxic effects were observed following dietary administration of 10 or 20 ppmp-methoxy-BSC or 20 ppm p-XSC. Administration of 20 ppm p-methoxy-BSC in a high-fat diet during the initiation and postinitiation phases of colon carcinogenesis significantly (statistically) reduced colon tumor incidence; 10 ppmp-methoxy-BSC in a high-fat diet significantly reduced colon tumor incidence but only when it was given during the postinitiation phase. Colon tumor incidence was also significantly reduced when 20 ppm p-XSC was given in a high-fat diet during the initiation phase of colon carcinogenesis. When 20 ppm p-XSC was administered in either a high-fat diet or a low-fat diet during the postinitiation phase, both colon tumor incidence and multiplicity were significantly reduced; the greatest reductions were in animals fed a low-fat diet. CONCLUSIONS In this model system, p-methoxy-BSC and p-XSC are effective agents for the chemoprevention of colon cancer. The effects of p-XSC were enhanced in animals fed a low-fat diet.
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Affiliation(s)
- B S Reddy
- Division of Nutritional Carcinogenesis, American Health Foundation, Valhalla, NY 10595, USA
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20
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el-Bayoumy K, Upadhyaya P, Chae YH, Sohn OS, Rao CV, Fiala E, Reddy BS. Chemoprevention of cancer by organoselenium compounds. JOURNAL OF CELLULAR BIOCHEMISTRY. SUPPLEMENT 1995; 22:92-100. [PMID: 8538214 DOI: 10.1002/jcb.240590812] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A major research goal of our laboratories is the development of new organoselenium cancer chemopreventive agents with less toxicity compared to some of the historical selenium compounds, such as sodium selenite. Ideally, such agents would be employed to inhibit tumor development in different organs caused by a variety of chemical carcinogens, particularly those present in the human environment. A series of organoselenium compounds has been synthesized and evaluated for their chemopreventive efficacy in vivo. Parallel to these studies, short-term in vitro and in vivo assays were employed to understand the mechanism of action and to rapidly evaluate their efficacy in eventual long-term preclinical investigations. We demonstrated that one of the most effective of these organoselenium compounds, 1,4-phenylenebis(methylene)selenocyanate (p-XSC, Fig. 1), is capable of inhibiting tumors in the mammary glands, colon, and lung of laboratory animals. Dietary p-XSC inhibited mammary tumor development induced by 7,12-dimethylbenz(a)anthracene (DMBA) during both the initiation and post-initiation phases of carcinogenesis in female CD rats. p-XSC inhibited DMBA-DNA adduct formation in the mammary glands. In collaboration with other laboratories, we demonstrated that p-XSC inhibited thymidine kinase in mammary tumor cell lines derived from both humans and rats. Employing mammary carcinoma cell lines, p-XSC was also shown to inhibit cell growth and induce a dose-dependent increase in cell death by apoptosis. In these assays p-XSC appears superior to selenite and to its sulfur analog, 1,4-phenylenebis(methylene)thiocyanate. Dietary p-XSC decreased colon tumor induction by azoxymethane in F344 rats during both phases of carcinogenesis.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- K el-Bayoumy
- American Health Foundation, Valhalla, NY 10595, USA
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