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Men X, Han X, Oh G, Im JH, Lim JS, Cho GH, Choi SI, Lee OH. Plant sources, extraction techniques, analytical methods, bioactivity, and bioavailability of sulforaphane: a review. Food Sci Biotechnol 2024; 33:539-556. [PMID: 38274178 PMCID: PMC10805900 DOI: 10.1007/s10068-023-01434-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 09/06/2023] [Accepted: 09/10/2023] [Indexed: 01/27/2024] Open
Abstract
Sulforaphane (SFN) is an isothiocyanate commonly found in cruciferous vegetables. It is formed via the enzymatic hydrolysis of glucoraphanin by myrosinase. SFN exerts various biological effects, including anti-cancer, anti-oxidation, anti-obesity, and anti-inflammatory effects, and is widely used in functional foods and clinical medicine. However, the structure of SFN is unstable and easily degradable, and its production is easily affected by temperature, pH, and enzyme activity, which limit its application. Hence, several studies are investigating its physicochemical properties, stability, and biological activity to identify methods to increase its content. This article provides a comprehensive review of the plant sources, extraction and analysis techniques, in vitro and in vivo biological activities, and bioavailability of SFN. This article highlights the importance and provides a reference for the research and application of SFN in the future.
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Affiliation(s)
- Xiao Men
- Department of Food Biotechnology and Environmental Science, Kangwon National University, Chuncheon, 24341 Republic of Korea
| | - Xionggao Han
- Department of Food Biotechnology and Environmental Science, Kangwon National University, Chuncheon, 24341 Republic of Korea
| | - Geon Oh
- Department of Food Biotechnology and Environmental Science, Kangwon National University, Chuncheon, 24341 Republic of Korea
| | - Ji-Hyun Im
- Department of Food Biotechnology and Environmental Science, Kangwon National University, Chuncheon, 24341 Republic of Korea
| | - June seok Lim
- Department of Food Biotechnology and Environmental Science, Kangwon National University, Chuncheon, 24341 Republic of Korea
| | - Geun hee Cho
- Department of Food Biotechnology and Environmental Science, Kangwon National University, Chuncheon, 24341 Republic of Korea
| | - Sun-Il Choi
- Department of Food Biotechnology and Environmental Science, Kangwon National University, Chuncheon, 24341 Republic of Korea
| | - Ok-Hwan Lee
- Department of Food Biotechnology and Environmental Science, Kangwon National University, Chuncheon, 24341 Republic of Korea
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2
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Bouranis JA, Beaver LM, Wong CP, Choi J, Hamer S, Davis EW, Brown KS, Jiang D, Sharpton TJ, Stevens JF, Ho E. Sulforaphane and Sulforaphane-Nitrile Metabolism in Humans Following Broccoli Sprout Consumption: Inter-individual Variation, Association with Gut Microbiome Composition, and Differential Bioactivity. Mol Nutr Food Res 2024; 68:e2300286. [PMID: 38143283 PMCID: PMC10922398 DOI: 10.1002/mnfr.202300286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 11/14/2023] [Indexed: 12/26/2023]
Abstract
SCOPE The glucosinolate glucoraphanin from broccoli is converted to sulforaphane (SFN) or sulforaphane-nitrile (SFN-NIT) by plant enzymes or the gut microbiome. Human feeding studies typically observe high inter-individual variation in absorption and excretion of SFN, however, the source of this variation is not fully known. To address this, a human feeding trial to comprehensively evaluate inter-individual variation in the absorption and excretion of all known SFN metabolites in urine, plasma, and stool, and tested the hypothesis that gut microbiome composition influences inter-individual variation in total SFN excretion has been conducted. METHODS AND RESULTS Participants (n = 55) consumed a single serving of broccoli or alfalfa sprouts and plasma, stool, and total urine are collected over 72 h for quantification of SFN metabolites and gut microbiome profiling using 16S gene sequencing. SFN-NIT excretion is markedly slower than SFN excretion (72 h vs 24 h). Members of genus Bifidobacterium, Dorea, and Ruminococcus torques are positively associated with SFN metabolite excretion while members of genus Alistipes and Blautia has a negative association. CONCLUSION This is the first report of SFN-NIT metabolite levels in human plasma, urine, and stool following consumption of broccoli sprouts. The results help explain factors driving inter-individual variation in SFN metabolism and are relevant for precision nutrition.
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Affiliation(s)
- John A Bouranis
- College of Health, Oregon State University, Corvallis, Oregon, USA
- Linus Pauling Institute, Oregon State University, Corvallis, Oregon, USA
| | - Laura M Beaver
- College of Health, Oregon State University, Corvallis, Oregon, USA
- Linus Pauling Institute, Oregon State University, Corvallis, Oregon, USA
| | - Carmen P Wong
- College of Health, Oregon State University, Corvallis, Oregon, USA
- Linus Pauling Institute, Oregon State University, Corvallis, Oregon, USA
| | - Jaewoo Choi
- Linus Pauling Institute, Oregon State University, Corvallis, Oregon, USA
| | - Sean Hamer
- College of Health, Oregon State University, Corvallis, Oregon, USA
- Linus Pauling Institute, Oregon State University, Corvallis, Oregon, USA
| | - Ed W Davis
- Linus Pauling Institute, Oregon State University, Corvallis, Oregon, USA
- Center for Quantitative Life Sciences, Oregon State University, Corvallis, Oregon, USA
| | - Kevin S Brown
- Department of Pharmaceutical Sciences, Oregon State University, Corvallis, Oregon, USA
| | - Duo Jiang
- Department of Statistics, Oregon State University, Corvallis, Oregon, USA
| | - Thomas J Sharpton
- Department of Statistics, Oregon State University, Corvallis, Oregon, USA
- Department of Microbiology, Oregon State University, Corvallis, Oregon, USA
| | - Jan F Stevens
- Linus Pauling Institute, Oregon State University, Corvallis, Oregon, USA
- Department of Pharmaceutical Sciences, Oregon State University, Corvallis, Oregon, USA
| | - Emily Ho
- College of Health, Oregon State University, Corvallis, Oregon, USA
- Linus Pauling Institute, Oregon State University, Corvallis, Oregon, USA
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3
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Kasamatsu S, Owaki T, Komae S, Kinno A, Ida T, Akaike T, Ihara H. Untargeted polysulfide omics analysis of alternations in polysulfide production during the germination of broccoli sprouts. Redox Biol 2023; 67:102875. [PMID: 37699321 PMCID: PMC10500461 DOI: 10.1016/j.redox.2023.102875] [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: 07/20/2023] [Revised: 08/23/2023] [Accepted: 09/02/2023] [Indexed: 09/14/2023] Open
Abstract
Higher consumption of broccoli (Brassica oleracea var. italica) is associated with a reduced risk of cardiometabolic diseases, neurological disorders, diabetes, and cancer. Broccoli is rich in various phytochemicals, including glucosinolates, and isothiocyanates. Moreover, it has recently reported the endogenous production of polysulfides, such as cysteine hydropersulfide (CysS2H) and glutathione hydropersulfide (GS2H), in mammals including humans, and that these bioactive substances function as potent antioxidants and important regulators of redox signaling in vivo. However, few studies have focused on the endogenous polysulfide content of broccoli and the impact of germination on the polysulfide content and composition in broccoli. In this study, we investigated the alternations in polysulfide biosynthesis in broccoli during germination by performing untargeted polysulfide omics analysis and quantitative targeted polysulfide metabolomics through liquid chromatography-electrospray ionization-tandem mass spectrometry. We also performed 2,2-diphenyl-1-picrylhydrazyl radical-scavenging assay to determine the antioxidant properties of the polysulfides. The results revealed that the total polysulfide content of broccoli sprouts significantly increased during germination and growth; CysS2H and cysteine hydrotrisulfide were the predominant organic polysulfide metabolites. Furthermore, we determined that novel sulforaphane (SFN) derivatives conjugated with CysS2H and GS2H were endogenously produced in the broccoli sprouts, and the novel SFN conjugated with CysS2H exhibited a greater radical scavenging capacity than SFN and cysteine. These results suggest that the abundance of polysulfides in broccoli sprouts contribute to their health-promoting properties. Our findings have important biological implications for the development of novel pharmacological targets for the health-promoting effects of broccoli sprouts in humans.
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Affiliation(s)
- Shingo Kasamatsu
- Department of Biological Chemistry, Graduate School of Science, Osaka Metropolitan University, Sakai, 599-8531, Japan; Department of Biological Science, Graduate School of Science, Osaka Prefecture University, Sakai, 599-8531, Japan
| | - Takuma Owaki
- Department of Biological Chemistry, Graduate School of Science, Osaka Metropolitan University, Sakai, 599-8531, Japan
| | - Somei Komae
- Department of Biological Science, Graduate School of Science, Osaka Prefecture University, Sakai, 599-8531, Japan
| | - Ayaka Kinno
- Department of Biological Science, Graduate School of Science, Osaka Prefecture University, Sakai, 599-8531, Japan
| | - Tomoaki Ida
- Organization for Research Promotion, Osaka Metropolitan University, Sakai, 599-8531, Japan
| | - Takaaki Akaike
- Department of Environmental Medicine and Molecular Toxicology, Tohoku University Graduate School of Medicine, Sendai, Miyagi, 980-8575, Japan
| | - Hideshi Ihara
- Department of Biological Chemistry, Graduate School of Science, Osaka Metropolitan University, Sakai, 599-8531, Japan; Department of Biological Science, Graduate School of Science, Osaka Prefecture University, Sakai, 599-8531, Japan.
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4
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Grady R, Traustadóttir T, Lagalante AF, Eggler AL. Bioavailable Sulforaphane Quantitation in Plasma by LC-MS/MS Is Enhanced by Blocking Thiols. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:12875-12882. [PMID: 37584212 PMCID: PMC10472501 DOI: 10.1021/acs.jafc.3c01367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 07/19/2023] [Accepted: 07/31/2023] [Indexed: 08/17/2023]
Abstract
Quantifying sulforaphane (SFN) and its thiol metabolites in biological samples using liquid chromatography-tandem mass spectrometry is complicated by SFN's electrophilic nature and the facile dissociation of SFN-thiol conjugates. SFN can be lost during sample preparation due to conjugation with protein thiols, which are precipitated and discarded. We observe that only 32 ± 3% of SFN is recovered 2 h after spiking into fetal bovine serum. The SFN-glutathione conjugate prepared at 10 mM in 0.1% formic acid in water (pH 3) dissociated by approximately 95% to free SFN, highlighting the difficulty in preparing thiol metabolite standards. We used the alkylating agent iodoacetamide (IAA) to both release SFN from protein thiols and force the dissociation of SFN metabolites. This thiol-blocking method increased SFN percent recovery from serum from 32 to 94 ± 5%, with a 4.7 nM method limit of quantitation. Applying the method to clinical samples, SFN concentrations were on average 6 times greater than when IAA was omitted. The IAA thiol-blocking method streamlines the analysis of bioavailable SFN in plasma samples.
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Affiliation(s)
- Rachel
S. Grady
- Department
of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Tinna Traustadóttir
- Department
of Biological Sciences, Northern Arizona
University, Flagstaff, Arizona 86001-5766, United States
| | - Anthony F. Lagalante
- Department
of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Aimee L. Eggler
- Department
of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
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5
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Renz M, Dekker M, Rohn S, Hanschen FS. Plant matrix concentration and redox status influence thermal glucosinolate stability and formation of nitriles in selected Brassica vegetable broths. Food Chem 2023; 404:134594. [DOI: 10.1016/j.foodchem.2022.134594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 09/16/2022] [Accepted: 10/10/2022] [Indexed: 11/06/2022]
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6
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Abd El-Montaleb HS, Abbas KAE, Mwaheb MA, Hamdy SM. Production and characteristic quality of probiotic Labneh cheese supplemented with broccoli florets. BRITISH FOOD JOURNAL 2022; 124:3666-3679. [DOI: 10.1108/bfj-05-2021-0554] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
PurposeThe purpose of this study is to develop functional probiotic Labneh cheeses supplemented with broccoli florets.Design/methodology/approachProbiotic Labneh cheese was produced using broccoli florets paste at four different levels (0, 5, 10 and 15%), with Lactobacillus casei NRRL B-1922 as a probiotic strain, to evaluate its physicochemical, phenols, antioxidant activity, minerals, vitamins, textural, microbiological and sensory characteristics during storage for 15 days.FindingsThe results indicated that Labneh cheese with added broccoli paste exhibited significantly (p = 0.05) higher level of moisture, acidity, soluble nitrogen, phenols, antioxidant activity, minerals and B vitamins, and lower protein, fat, ash and pH values when compared to control Labneh cheese. Textural analysis of Labneh cheese indicated that Labneh with higher level of broccoli (15%) exhibited harder texture than others. Higher viable counts of Lactobacillus casei and Streptococcus thermophilus were detected in Labneh with broccoli paste, and the counts (107 cfu/g) were higher than the number should be present to achieve their health benefits. The most acceptable Labneh cheeses were those supplemented with 5 and 10% broccoli paste.Originality/valueThis study revealed broccoli florets could enhance the growth of Lactobacillus casei and Streptococcus thermophilus in the Labneh matrix, which resulted in a wider spectrum of health benefits of Labneh cheese to the consumers.
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7
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Fanta CC, Tlusty KJ, Pauley SE, Johnson AL, Benjamin GA, Yseth TK, Bunde MM, Pierce PT, Wang S, Vitiello PF, Mays JR. Synthesis and Evaluation of Functionalized Aryl and Biaryl Isothiocyanates Against Human MCF-7 Cells. ChemMedChem 2022; 17:e202200250. [PMID: 35588002 DOI: 10.1002/cmdc.202200250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 05/18/2022] [Indexed: 11/11/2022]
Abstract
Organic isothiocyanates (ITCs) are a class of anticancer agents which naturally result from the enzymatic degradation of glucosinolates produced by Brassica vegetables. Previous studies have demonstrated that the structure of an ITC impacts its potency and mode(s) of anticancer properties, opening the way to preparation and evaluation of synthetic, non-natural ITC analogues. This study describes the preparation of a library of 79 non-natural ITC analogues intended to probe further structure-activity relationships for aryl ITCs and second-generation, functionalized biaryl ITC variants. ITC candidates were subjected to bifurcated evaluation of antiproliferative and antioxidant response element (ARE)-induction capacity against human MCF-7 cells. The results of this study led to the identification of (1) several key structure-activity relationships and (2) lead ITCs demonstrating potent antiproliferative properties.
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Affiliation(s)
- Claire C Fanta
- Augustana University, Chemistry & Biochemistry, UNITED STATES
| | | | - Sarah E Pauley
- Augustana University, Chemistry & Biochemistry, UNITED STATES
| | | | | | - Taylor K Yseth
- Augustana University, Chemistry & Biochemistry, UNITED STATES
| | | | - Paul T Pierce
- The University of Oklahoma Health Sciences Center, Pediatrics, UNITED STATES
| | - Shirley Wang
- The University of Oklahoma Health Sciences Center, Pediatrics, UNITED STATES
| | - Peter F Vitiello
- The University of Oklahoma Health Sciences Center, Pediatrics; Physiology; Biochemistry & Molecular Biology, UNITED STATES
| | - Jared R Mays
- Augustana University, Chemistry & Biochemistry, 2001 S. Summit Ave., 57197, Sioux Falls, UNITED STATES
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8
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Wu J, Cui S, Liu J, Tang X, Zhao J, Zhang H, Mao B, Chen W. The recent advances of glucosinolates and their metabolites: Metabolism, physiological functions and potential application strategies. Crit Rev Food Sci Nutr 2022:1-18. [PMID: 35389274 DOI: 10.1080/10408398.2022.2059441] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Glucosinolates and their metabolites from Brassicaceae plants have received widespread attention due to their anti-inflammatory effects. Glucosinolates occurs an "enterohepatic circulation" in the body, and the glucosinolates metabolism mainly happens in the intestine. Glucosinolates can be converted into isothiocyanates by intestinal bacteria, which are active substances with remarkable anti-inflammatory, anti-cancer, anti-obesity and neuroprotective properties. This biotransformation can greatly improve the bioactivities of glucosinolates. However, multiple factors in the environment can affect the biotransformation to isothiocyanates, including acidic pH, ferrous ions and thiocyanate-forming protein. The derivatives of glucosinolates under those conditions are usually nitriles and thiocyanates, which may impair the potential health benefits. In addition, isothiocyanates are extremely unstable because of an active sulfhydryl group, which limits their applications. This review mainly summarizes the classification, synthesis, absorption, metabolism, physiological functions and potential application strategies of glucosinolates and their metabolites.
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Affiliation(s)
- Jiaying Wu
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China.,School of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Shumao Cui
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China.,School of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Junsheng Liu
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China.,School of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Xin Tang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China.,School of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Jianxin Zhao
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China.,School of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Hao Zhang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China.,School of Food Science and Technology, Jiangnan University, Wuxi, China.,National Engineering Research Center for Functional Food, Jiangnan University, China
| | - Bingyong Mao
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China.,School of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Wei Chen
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China.,School of Food Science and Technology, Jiangnan University, Wuxi, China.,National Engineering Research Center for Functional Food, Jiangnan University, China
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9
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Janczewski Ł. Sulforaphane and Its Bifunctional Analogs: Synthesis and Biological Activity. Molecules 2022; 27:1750. [PMID: 35268851 PMCID: PMC8911885 DOI: 10.3390/molecules27051750] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 03/04/2022] [Accepted: 03/05/2022] [Indexed: 12/27/2022] Open
Abstract
For decades, various plants have been studied as sources of biologically active compounds. Compounds with anticancer and antimicrobial properties are the most frequently desired. Cruciferous plants, including Brussels sprouts, broccoli, and wasabi, have a special role in the research studies. Studies have shown that consumption of these plants reduce the risk of lung, breast, and prostate cancers. The high chemopreventive and anticancer potential of cruciferous plants results from the presence of a large amount of glucosinolates, which, under the influence of myrosinase, undergo an enzymatic transformation to biologically active isothiocyanates (ITCs). Natural isothiocyanates, such as benzyl isothiocyanate, phenethyl isothiocyanate, or the best-tested sulforaphane, possess anticancer activity at all stages of the carcinogenesis process, show antibacterial activity, and are used in organic synthesis. Methods of synthesis of sulforaphane, as well as its natural or synthetic bifunctional analogues with sulfinyl, sulfanyl, sulfonyl, phosphonate, phosphinate, phosphine oxide, carbonyl, ester, carboxamide, ether, or additional isothiocyanate functional groups, and with the unbranched alkyl chain containing 2-6 carbon atoms, are discussed in this review. The biological activity of these compounds are also reported. In the first section, glucosinolates, isothiocyanates, and mercapturic acids (their metabolites) are briefly characterized. Additionally, the most studied anticancer and antibacterial mechanisms of ITC actions are discussed.
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Affiliation(s)
- Łukasz Janczewski
- Faculty of Chemistry, Institute of Organic Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
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10
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Bouranis JA, Beaver LM, Ho E. Metabolic Fate of Dietary Glucosinolates and Their Metabolites: A Role for the Microbiome. Front Nutr 2021; 8:748433. [PMID: 34631775 PMCID: PMC8492924 DOI: 10.3389/fnut.2021.748433] [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: 07/27/2021] [Accepted: 08/27/2021] [Indexed: 01/08/2023] Open
Abstract
Robust evidence shows that phytochemicals from cruciferous vegetables, like broccoli, are associated with numerous health benefits. The anti-cancer properties of these foods are attributed to bioactive isothiocyanates (ITCs) and indoles, phytochemicals generated from biological precursor compounds called glucosinolates. ITCs, and particularly sulforaphane (SFN), are of intense interest as they block the initiation, and suppress the progression of cancer, through genetic and epigenetic mechanisms. The efficacy of these compounds is well-demonstrated in cell culture and animal models, however, high levels of inter-individual variation in absorption and excretion of ITCs is a significant barrier to the use of dietary glucosinolates to prevent and treat disease. The source of inter-individual ITC variation has yet to be fully elucidated and the gut microbiome may play a key role. This review highlights evidence that the gut microbiome influences the metabolic fate and activity of ITCs. Human feeding trials have shown inter-individual variations in gut microbiome composition coincides with variations in ITC absorption and excretion, and some bacteria produce ITCs from glucosinolates. Additionally, consumption of cruciferous vegetables can alter the composition of the gut microbiome and shift the physiochemical environment of the gut lumen, influencing the production of phytochemicals. Microbiome and diet induced changes to ITC metabolism may lead to the decrease of cancer fighting phytochemicals such as SFN and increase the production of biologically inert ones like SFN-nitrile. We conclude by offering perspective on the use of novel “omics” technologies to elucidate the interplay of the gut microbiome and ITC formation.
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Affiliation(s)
- John A Bouranis
- Linus Pauling Institute, Oregon State University, Corvallis, OR, United States.,School of Biological and Population Health Sciences, Oregon State University, Corvallis, OR, United States
| | - Laura M Beaver
- Linus Pauling Institute, Oregon State University, Corvallis, OR, United States.,School of Biological and Population Health Sciences, Oregon State University, Corvallis, OR, United States
| | - Emily Ho
- Linus Pauling Institute, Oregon State University, Corvallis, OR, United States.,School of Biological and Population Health Sciences, Oregon State University, Corvallis, OR, United States
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11
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Improvement of glucosinolates by metabolic engineering in Brassica crops. ABIOTECH 2021; 2:314-329. [PMID: 36303883 PMCID: PMC9590530 DOI: 10.1007/s42994-021-00057-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Accepted: 07/07/2021] [Indexed: 02/08/2023]
Abstract
Glucosinolates (GSLs) are a class of sulfur- and nitrogen-containing, and amino acid-derived important secondary metabolites, which mainly present in plants of Brassicaceae family, including Brassica crops, such as broccoli, cabbage, and oilseed rape. The bioactive GSL metabolites confer benefits to plant defense, human health, and the unique flavor of some Brassica crops. However, certain GSL profiles have adverse effects and are known as anti-nutritional factors. This has attracted mounting attempts to increase beneficial GSLs and reduce detrimental ones in the most commonly consumed Brassica crops. We provide a comprehensive overview of metabolic engineering applied in Brassica crops to achieve this purpose, including modulation of GSL biosynthesis, ablation of GSL hydrolysis, inhibition of GSL transport processes, and redirection of metabolic flux to GSL. Moreover, advances in omics approaches, i.e., genomics, transcriptome, and metabolome, applied in the elucidation of GSL metabolism in Brassica crops, as well as promising and potential genome-editing technologies are also discussed.
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12
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Composition of the Gut Microbiome Influences Production of Sulforaphane-Nitrile and Iberin-Nitrile from Glucosinolates in Broccoli Sprouts. Nutrients 2021; 13:nu13093013. [PMID: 34578891 PMCID: PMC8468500 DOI: 10.3390/nu13093013] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 08/24/2021] [Accepted: 08/24/2021] [Indexed: 12/17/2022] Open
Abstract
Isothiocyanates, such as sulforaphane and iberin, derived from glucosinolates (GLS) in cruciferous vegetables, are known to prevent and suppress cancer development. GLS can also be converted by bacteria to biologically inert nitriles, such as sulforaphane-nitrile (SFN-NIT) and iberin-nitrile (IBN-NIT), but the role of the gut microbiome in this process is relatively undescribed and SFN-NIT excretion in humans is unknown. An ex vivo fecal incubation model with in vitro digested broccoli sprouts and 16S sequencing was utilized to explore the role of the gut microbiome in SFN- and IBN-NIT production. SFN-NIT excretion was measured among human subjects following broccoli sprout consumption. The fecal culture model showed high inter-individual variability in nitrile production and identified two sub-populations of microbial communities among the fecal cultures, which coincided with a differing abundance of nitriles. The Clostridiaceae family was associated with high levels, while individuals with a low abundance of nitriles were more enriched with taxa from the Enterobacteriaceae family. High levels of inter-individual variation in urine SFN-NIT levels were also observed, with peak excretion of SFN-NIT at 24 h post broccoli sprout consumption. These results suggest that nitrile production from broccoli, as opposed to isothiocyanates, could be influenced by gut microbiome composition, potentially lowering efficacy of cruciferous vegetable interventions.
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13
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Elkashty OA, Tran SD. Sulforaphane as a Promising Natural Molecule for Cancer Prevention and Treatment. Curr Med Sci 2021; 41:250-269. [PMID: 33877541 DOI: 10.1007/s11596-021-2341-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2019] [Accepted: 04/24/2020] [Indexed: 12/13/2022]
Abstract
Tumorigenicity-inhibiting compounds have been identified in our daily diet. For example, isothiocyanates (ITCs) found in cruciferous vegetables were reported to have potent cancer-prevention activities. The best characterized ITC is sulforaphane (SF). SF can simultaneously modulate multiple cellular targets involved in carcinogenesis, including (1) modulating carcinogen-metabolizing enzymes and blocking the action of mutagens; (2) inhibition of cell proliferation and induction of apoptosis; and (3) inhibition of neo-angiogenesis and metastasis. SF targets cancer stem cells through modulation of nuclear factor kappa B (NF-κB), Sonic hedgehog (SHH), epithelial-mesenchymal transition, and Wnt/β-catenin pathways. Conventional chemotherapy/SF combination was tested in several studies and resulted in favorable outcomes. With its favorable toxicological profile, SF is a promising agent in cancer prevention and/or therapy. In this article, we discuss the human metabolism of SF and its effects on cancer prevention, treatment, and targeting cancer stem cells, as well as providing a brief review of recent human clinical trials on SF.
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Affiliation(s)
- Osama A Elkashty
- McGill Craniofacial Tissue Engineering and Stem Cells Laboratory, Faculty of Dentistry, McGill University, Montreal, H3A 0G4, Canada.,Department of Oral Pathology, Faculty of Dentistry, Mansoura University, Mansoura, 35516, Egypt
| | - Simon D Tran
- McGill Craniofacial Tissue Engineering and Stem Cells Laboratory, Faculty of Dentistry, McGill University, Montreal, H3A 0G4, Canada.
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Tauber S, Sieckmann MK, Erler K, Stahl W, Klotz LO, Steinbrenner H. Activation of Nrf2 by Electrophiles Is Largely Independent of the Selenium Status of HepG2 Cells. Antioxidants (Basel) 2021; 10:antiox10020167. [PMID: 33498683 PMCID: PMC7911449 DOI: 10.3390/antiox10020167] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 01/15/2021] [Accepted: 01/21/2021] [Indexed: 12/13/2022] Open
Abstract
Selenoenzymes, whose activity depends on adequate selenium (Se) supply, and phase II enzymes, encoded by target genes of nuclear factor erythroid 2-related factor 2 (Nrf2), take part in governing cellular redox homeostasis. Their interplay is still not entirely understood. Here, we exposed HepG2 hepatoma cells cultured under Se-deficient, Se-adequate, or Se-supranutritional conditions to the Nrf2 activators sulforaphane, cardamonin, or diethyl maleate. Nrf2 protein levels and intracellular localization were determined by immunoblotting, and mRNA levels of Nrf2 target genes and selenoproteins were assessed by qRT-PCR. Exposure to electrophiles resulted in rapid induction of Nrf2 and its enrichment in the nucleus, independent of the cellular Se status. All three electrophilic compounds caused an enhanced expression of Nrf2 target genes, although with differences regarding extent and time course of their induction. Whereas Se status did not significantly affect mRNA levels of the Nrf2 target genes, gene expression of selenoproteins with a low position in the cellular "selenoprotein hierarchy", such as glutathione peroxidase 1 (GPX1) or selenoprotein W (SELENOW), was elevated under Se-supplemented conditions, as compared to cells held in Se-deficient media. In conclusion, no major effect of Se status on Nrf2 signalling was observed in HepG2 cells.
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Affiliation(s)
- Sarah Tauber
- Institute of Nutritional Sciences, Nutrigenomics Section, Friedrich Schiller University Jena, D-07743 Jena, Germany; (S.T.); (M.K.S.); (K.E.); (L.-O.K.)
| | - Maria Katharina Sieckmann
- Institute of Nutritional Sciences, Nutrigenomics Section, Friedrich Schiller University Jena, D-07743 Jena, Germany; (S.T.); (M.K.S.); (K.E.); (L.-O.K.)
| | - Katrin Erler
- Institute of Nutritional Sciences, Nutrigenomics Section, Friedrich Schiller University Jena, D-07743 Jena, Germany; (S.T.); (M.K.S.); (K.E.); (L.-O.K.)
| | - Wilhelm Stahl
- Institute of Biochemistry and Molecular Biology I, Medical Faculty, Heinrich Heine University Düsseldorf, D-40001 Düsseldorf, Germany;
| | - Lars-Oliver Klotz
- Institute of Nutritional Sciences, Nutrigenomics Section, Friedrich Schiller University Jena, D-07743 Jena, Germany; (S.T.); (M.K.S.); (K.E.); (L.-O.K.)
| | - Holger Steinbrenner
- Institute of Nutritional Sciences, Nutrigenomics Section, Friedrich Schiller University Jena, D-07743 Jena, Germany; (S.T.); (M.K.S.); (K.E.); (L.-O.K.)
- Correspondence: ; Tel.: +49-3641-949757
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Landberg R, Manach C, Kerckhof FM, Minihane AM, Saleh RNM, De Roos B, Tomas-Barberan F, Morand C, Van de Wiele T. Future prospects for dissecting inter-individual variability in the absorption, distribution and elimination of plant bioactives of relevance for cardiometabolic endpoints. Eur J Nutr 2019; 58:21-36. [PMID: 31642982 PMCID: PMC6851035 DOI: 10.1007/s00394-019-02095-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2019] [Accepted: 09/19/2019] [Indexed: 12/20/2022]
Abstract
PURPOSE The health-promoting potential of food-derived plant bioactive compounds is evident but not always consistent across studies. Large inter-individual variability may originate from differences in digestion, absorption, distribution, metabolism and excretion (ADME). ADME can be modulated by age, sex, dietary habits, microbiome composition, genetic variation, drug exposure and many other factors. Within the recent COST Action POSITIVe, large-scale literature surveys were undertaken to identify the reasons and extent of inter-individual variability in ADME of selected plant bioactive compounds of importance to cardiometabolic health. The aim of the present review is to summarize the findings and suggest a framework for future studies designed to investigate the etiology of inter-individual variability in plant bioactive ADME and bioefficacy. RESULTS Few studies have reported individual data on the ADME of bioactive compounds and on determinants such as age, diet, lifestyle, health status and medication, thereby limiting a mechanistic understanding of the main drivers of variation in ADME processes observed across individuals. Metabolomics represent crucial techniques to decipher inter-individual variability and to stratify individuals according to metabotypes reflecting the intrinsic capacity to absorb and metabolize bioactive compounds. CONCLUSION A methodological framework was developed to decipher how the contribution from genetic variants or microbiome variants to ADME of bioactive compounds can be predicted. Future study design should include (1) a larger number of study participants, (2) individual and full profiling of all possible determinants of internal exposure, (3) the presentation of individual ADME data and (4) incorporation of omics platforms, such as genomics, microbiomics and metabolomics in ADME and efficacy studies.
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Affiliation(s)
- Rikard Landberg
- Department of Biology and Biological Engineering, Food and Nutrition Science, Chalmers University of Technology, 412 96, Gothenburg, Sweden.
| | - Claudine Manach
- Université Clermont Auvergne, INRA, UNH, Unité de Nutrition Humaine, CRNH Auvergne, Clermont-Ferrand, France
| | - Frederiek-Maarten Kerckhof
- Center for Microbial Ecology and Technology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Anne-Marie Minihane
- Department of Nutrition and Preventive Medicine, Norwich Medical School, University of East Anglia (UEA), Norwich, UK
| | - Rasha Noureldin M Saleh
- Department of Nutrition and Preventive Medicine, Norwich Medical School, University of East Anglia (UEA), Norwich, UK
| | - Baukje De Roos
- University of Aberdeen, the Rowett Institute, Aberdeen, UK
| | - Francisco Tomas-Barberan
- Food and Health Laboratory, Research Group on Quality, Safety, and Bioactivity of Plant Foods, CEBAS-CSIC, Campus de Espinardo, Murcia, Spain
| | - Christine Morand
- Université Clermont Auvergne, INRA, UNH, Unité de Nutrition Humaine, CRNH Auvergne, Clermont-Ferrand, France
| | - Tom Van de Wiele
- Center for Microbial Ecology and Technology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
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Mitsiogianni M, Koutsidis G, Mavroudis N, Trafalis DT, Botaitis S, Franco R, Zoumpourlis V, Amery T, Galanis A, Pappa A, Panayiotidis MI. The Role of Isothiocyanates as Cancer Chemo-Preventive, Chemo-Therapeutic and Anti-Melanoma Agents. Antioxidants (Basel) 2019; 8:E106. [PMID: 31003534 PMCID: PMC6523696 DOI: 10.3390/antiox8040106] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Revised: 04/03/2019] [Accepted: 04/12/2019] [Indexed: 12/11/2022] Open
Abstract
Many studies have shown evidence in support of the beneficial effects of phytochemicals in preventing chronic diseases, including cancer. Among such phytochemicals, sulphur-containing compounds (e.g., isothiocyanates (ITCs)) have raised scientific interest by exerting unique chemo-preventive properties against cancer pathogenesis. ITCs are the major biologically active compounds capable of mediating the anticancer effect of cruciferous vegetables. Recently, many studies have shown that a higher intake of cruciferous vegetables is associated with reduced risk of developing various forms of cancers primarily due to a plurality of effects, including (i) metabolic activation and detoxification, (ii) inflammation, (iii) angiogenesis, (iv) metastasis and (v) regulation of the epigenetic machinery. In the context of human malignant melanoma, a number of studies suggest that ITCs can cause cell cycle growth arrest and also induce apoptosis in human malignant melanoma cells. On such basis, ITCs could serve as promising chemo-therapeutic agents that could be used in the clinical setting to potentiate the efficacy of existing therapies.
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Affiliation(s)
- Melina Mitsiogianni
- Department of Applied Sciences, Northumbria University, Newcastle Upon Tyne NE1 8ST, UK.
| | - Georgios Koutsidis
- Department of Applied Sciences, Northumbria University, Newcastle Upon Tyne NE1 8ST, UK.
| | - Nikos Mavroudis
- Department of Food and Nutritional Sciences, University of Reading, Reading RG6 6AP, UK.
| | - Dimitrios T Trafalis
- Laboratory of Pharmacology, Unit of Clinical Pharmacology, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece.
| | - Sotiris Botaitis
- Second Department of Surgery, Democritus University of Thrace, 68100 Alexandroupolis, Greece.
| | - Rodrigo Franco
- Redox Biology Centre, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
- School of Veterinary Medicine and Biomedical Sciences, University of Nebraska-Lincoln, Lincoln, NE 68583, USA.
| | - Vasilis Zoumpourlis
- Institute of Biology, Medicinal Chemistry and Biotechnology, National Hellenic Research Foundation, 11635 Athens, Greece.
| | - Tom Amery
- The Watrercress Company / The Wasabi Company, Waddock, Dorchester, Dorset DT2 8QY, UK.
| | - Alex Galanis
- Department of Molecular Biology and Genetics, Democritus University of Thrace, 68100 Alexandroupolis, Greece.
| | - Aglaia Pappa
- Department of Molecular Biology and Genetics, Democritus University of Thrace, 68100 Alexandroupolis, Greece.
| | - Mihalis I Panayiotidis
- Department of Applied Sciences, Northumbria University, Newcastle Upon Tyne NE1 8ST, UK.
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Mitsiogianni M, Amery T, Franco R, Zoumpourlis V, Pappa A, Panayiotidis MI. From chemo-prevention to epigenetic regulation: The role of isothiocyanates in skin cancer prevention. Pharmacol Ther 2018; 190:187-201. [DOI: 10.1016/j.pharmthera.2018.06.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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18
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Anderson RH, Lensing CJ, Forred BJ, Amolins MW, Aegerter CL, Vitiello PF, Mays JR. Differentiating Antiproliferative and Chemopreventive Modes of Activity for Electron-Deficient Aryl Isothiocyanates against Human MCF-7 Cells. ChemMedChem 2018; 13:1695-1710. [PMID: 29924910 PMCID: PMC6105534 DOI: 10.1002/cmdc.201800348] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 06/12/2018] [Indexed: 12/13/2022]
Abstract
The consumption of Brassica vegetables provides beneficial effects through organic isothiocyanates (ITCs), products of the enzymatic hydrolysis of glucosinolate secondary metabolites. The ITC l-sulforaphane (l-SFN) is the principle agent in broccoli that demonstrates several modes of anticancer action. While the anticancer properties of ITCs like l-SFN have been extensively studied and l-SFN has been the subject of multiple human clinical trials, the scope of this work has largely been limited to those derivatives found in nature. Previous studies have demonstrated that structural changes in an ITC can lead to marked differences in a compound's potency to 1) inhibit the growth of cancer cells, and 2) alter cellular transcriptional profiles. This study describes the preparation of a library of non-natural aryl ITCs and the development of a bifurcated screening approach to evaluate the dose- and time-dependence on antiproliferative and chemopreventive properties against human MCF-7 breast cancer cells. Antiproliferative effects were evaluated using a commercial MTS cell viability assay. Chemopreventive properties were evaluated using an antioxidant response element (ARE)-promoted luciferase reporter assay. The results of this study have led to the identification of 1) several key structure-activity relationships and 2) lead ITCs for continued development.
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Affiliation(s)
- Ruthellen H. Anderson
- Department of Chemistry Augustana University 2001 S. Summit Ave. Sioux Falls, SD 57197
| | - Cody J. Lensing
- Department of Chemistry Augustana University 2001 S. Summit Ave. Sioux Falls, SD 57197
| | - Benjamin J. Forred
- Environmental Influences on Health and Disease Group Sanford Research 2301 E. 60 St. N. Sioux Falls, SD 57104
| | - Michael W. Amolins
- Department of Chemistry Augustana University 2001 S. Summit Ave. Sioux Falls, SD 57197
- Environmental Influences on Health and Disease Group Sanford Research 2301 E. 60 St. N. Sioux Falls, SD 57104
| | - Cassandra L. Aegerter
- Environmental Influences on Health and Disease Group Sanford Research 2301 E. 60 St. N. Sioux Falls, SD 57104
| | - Peter F. Vitiello
- Environmental Influences on Health and Disease Group Sanford Research 2301 E. 60 St. N. Sioux Falls, SD 57104
| | - Jared R. Mays
- Department of Chemistry Augustana University 2001 S. Summit Ave. Sioux Falls, SD 57197
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Liu P, Wang W, Zhou Z, Smith AJO, Bowater RP, Wormstone IM, Chen Y, Bao Y. Chemopreventive Activities of Sulforaphane and Its Metabolites in Human Hepatoma HepG2 Cells. Nutrients 2018; 10:nu10050585. [PMID: 29747418 PMCID: PMC5986465 DOI: 10.3390/nu10050585] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 05/02/2018] [Accepted: 05/04/2018] [Indexed: 12/04/2022] Open
Abstract
Sulforaphane (SFN) exhibits chemopreventive effects through various mechanisms. However, few studies have focused on the bioactivities of its metabolites. Here, three metabolites derived from SFN were studied, known as sulforaphane glutathione, sulforaphane cysteine and sulforaphane-N-acetylcysteine. Their effects on cell viability, DNA damage, tumorigenicity, cell migration and adhesion were measured in human hepatoma HepG2 cells, and their anti-angiogenetic effects were determined in a 3D co-culture model of human umbilical vein endothelial cells (HUVECs) and pericytes. Results indicated that these metabolites at high doses decreased cancer cell viability, induced DNA damage and inhibited motility, and impaired endothelial cell migration and tube formation. Additionally, pre-treatment with low doses of SFN metabolites protected against H2O2 challenge. The activation of the nuclear factor E2-related factor 2 (Nrf2)-antioxidant response element (ARE) pathway and the induction of intracellular glutathione (GSH) played an important role in the cytoprotective effects of SFN metabolites. In conclusion, SFN metabolites exhibited similar cytotoxic and cytoprotective effects to SFN, which proves the necessity to study the mechanisms of action of not only SFN but also of its metabolites. Based on the different tissue distribution profiles of these metabolites, the most relevant chemical forms can be selected for targeted chemoprevention.
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Affiliation(s)
- Peng Liu
- Norwich Medical School, University of East Anglia, Norfolk, Norwich NR4 7UQ, UK.
| | - Wei Wang
- Norwich Medical School, University of East Anglia, Norfolk, Norwich NR4 7UQ, UK.
| | - Zhigang Zhou
- Norwich Medical School, University of East Anglia, Norfolk, Norwich NR4 7UQ, UK.
| | - Andrew J O Smith
- School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, Norfolk NR4 7TJ, UK.
| | - Richard P Bowater
- School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, Norfolk NR4 7TJ, UK.
| | - Ian Michael Wormstone
- School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, Norfolk NR4 7TJ, UK.
| | - Yuqiong Chen
- College of Horticulture and Forestry Science Huazhong Agricultural University, Wuhan 430070, China.
| | - Yongping Bao
- Norwich Medical School, University of East Anglia, Norfolk, Norwich NR4 7UQ, UK.
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20
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Campos D, Chirinos R, Gálvez Ranilla L, Pedreschi R. Bioactive Potential of Andean Fruits, Seeds, and Tubers. ADVANCES IN FOOD AND NUTRITION RESEARCH 2018; 84:287-343. [PMID: 29555072 DOI: 10.1016/bs.afnr.2017.12.005] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The Andes is considered the longest continental mountain range in the world. It covers 7000km long and about 200-700km wide and an average height of about 4000m. Very unique plant species are endemic of this area including fruits (e.g., lucuma, cherimoya, sweet pepino, sauco), roots and tubers (potatoes, sweet potatoes, yacón, chicuru, mashua, olluco, etc.), and seeds (quinoa, amaranth, tarwi, etc.). These crops have been used for centuries by the native population and relatively recently have gained the world attention due to the wide range of nutrients and/or phytochemicals they possess. In this chapter, main Andean fruits, seeds, and roots and tubers have been selected and detailed nutritional and functional information is provided. In addition, traditional and current uses are provided and their bioactive potential is reported based on published scientific literature.
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Affiliation(s)
- David Campos
- Institute of Biotechnology (IBT), Universidad Agraria La Molina, Lima, Peru
| | - Rosana Chirinos
- Institute of Biotechnology (IBT), Universidad Agraria La Molina, Lima, Peru
| | | | - Romina Pedreschi
- School of Agronomy, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile.
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21
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Revelou P, Kokotou M, Pappas C, Constantinou-Kokotou V. Direct determination of total isothiocyanate content in broccoli using attenuated total reflectance infrared Fourier transform spectroscopy. J Food Compost Anal 2017. [DOI: 10.1016/j.jfca.2017.01.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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22
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Broccoli seed extracts but not sulforaphane have strong free radical scavenging activities. Int J Food Sci Technol 2017. [DOI: 10.1111/ijfs.13521] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Cassidy A, Minihane AM. The role of metabolism (and the microbiome) in defining the clinical efficacy of dietary flavonoids. Am J Clin Nutr 2017; 105:10-22. [PMID: 27881391 PMCID: PMC5183723 DOI: 10.3945/ajcn.116.136051] [Citation(s) in RCA: 315] [Impact Index Per Article: 45.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Accepted: 10/13/2016] [Indexed: 01/10/2023] Open
Abstract
At a population level, there is growing evidence of the beneficial effects of dietary flavonoids on health. However, there is extensive heterogeneity in the response to increased intake, which is likely mediated via wide interindividual variability in flavonoid absorption and metabolism. Flavonoids are extensively metabolized by phase I and phase II metabolism (which occur predominantly in the gastrointestinal tract and liver) and colonic microbial metabolism. A number of factors, including age, sex, and genotype, may affect these metabolic processes. In addition, food composition and flavonoid source are likely to affect bioavailability, and emerging data suggest a critical role for the microbiome. This review will focus on the current knowledge for the main subclasses of flavonoids, including anthocyanins, flavonols, flavan-3-ols, and flavanones, for which there is growing evidence from prospective studies of beneficial effects on health. The identification of key factors that govern metabolism and an understanding of how the differential capacity to metabolize these bioactive compounds affect health outcomes will help establish how to optimize intakes of flavonoids for health benefits and in specific subgroups. We identify research areas that need to be addressed to further understand important determinants of flavonoid bioavailability and metabolism and to advance the knowledge base that is required to move toward the development of dietary guidelines and recommendations for flavonoids and flavonoid-rich foods.
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Affiliation(s)
- Aedín Cassidy
- Department of Nutrition and Preventive Medicine, Norwich Medical School, University of East Anglia, Norwich, United Kingdom
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24
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Yin TF, Wang M, Qing Y, Lin YM, Wu D. Research progress on chemopreventive effects of phytochemicals on colorectal cancer and their mechanisms. World J Gastroenterol 2016; 22:7058-7068. [PMID: 27610016 PMCID: PMC4988307 DOI: 10.3748/wjg.v22.i31.7058] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2016] [Revised: 05/31/2016] [Accepted: 06/15/2016] [Indexed: 02/06/2023] Open
Abstract
Colorectal cancer (CRC) is a type of cancer with high morbidity and mortality rates worldwide and has become a global health problem. The conventional radiotherapy and chemotherapy regimen for CRC not only has a low cure rate but also causes side effects. Many studies have shown that adequate intake of fruits and vegetables in the diet may have a protective effect on CRC occurrence, possibly due to the special biological protective effect of the phytochemicals in these foods. Numerous in vitro and in vivo studies have demonstrated that phytochemicals play strong antioxidant, anti-inflammatory and anti-cancer roles by regulating specific signaling pathways and molecular markers to inhibit the occurrence and development of CRC. This review summarizes the progress on CRC prevention using the phytochemicals sulforaphane, curcumin and resveratrol, and elaborates on the specific underlying mechanisms. Thus, we believe that phytochemicals might provide a novel therapeutic approach for CRC prevention, but future clinical studies are needed to confirm the specific preventive effect of phytochemicals on cancer.
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Wang W, He Y, Yu G, Li B, Sexton DW, Wileman T, Roberts AA, Hamilton CJ, Liu R, Chao Y, Shan Y, Bao Y. Sulforaphane Protects the Liver against CdSe Quantum Dot-Induced Cytotoxicity. PLoS One 2015; 10:e0138771. [PMID: 26402917 PMCID: PMC4581733 DOI: 10.1371/journal.pone.0138771] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Accepted: 07/10/2015] [Indexed: 12/28/2022] Open
Abstract
The potential cytotoxicity of cadmium selenide (CdSe) quantum dots (QDs) presents a barrier to their use in biomedical imaging or as diagnostic and therapeutic agents. Sulforaphane (SFN) is a chemoprotective compound derived from cruciferous vegetables which can up-regulate antioxidant enzymes and induce apoptosis and autophagy. This study reports the effects of SFN on CdSe QD-induced cytotoxicity in immortalised human hepatocytes and in the livers of mice. CdSe QDs induced dose-dependent cell death in hepatocytes with an IC50 = 20.4 μM. Pre-treatment with SFN (5 μM) increased cell viability in response to CdSe QDs (20 μM) from 49.5 to 89.3%. SFN induced a pro-oxidant effect characterized by depletion of intracellular reduced glutathione during short term exposure (3–6 h), followed by up-regulation of antioxidant enzymes and glutathione levels at 24 h. SFN also caused Nrf2 translocation into the nucleus, up-regulation of antioxidant enzymes and autophagy. siRNA knockdown of Nrf2 suggests that the Nrf2 pathway plays a role in the protection against CdSe QD-induced cell death. Wortmannin inhibition of SFN-induced autophagy significantly suppressed the protective effect of SFN on CdSe QD-induced cell death. Moreover, the role of autophagy in SFN protection against CdSe QD-induced cell death was confirmed using mouse embryonic fibroblasts lacking ATG5. CdSe QDs caused significant liver damage in mice, and this was decreased by SFN treatment. In conclusion, SFN attenuated the cytotoxicity of CdSe QDs in both human hepatocytes and in the mouse liver, and this protection was associated with the induction of Nrf2 pathway and autophagy.
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Affiliation(s)
- Wei Wang
- Norwich Medical School, University of East Anglia, Norwich, Norfolk, United Kingdom
| | - Yan He
- Department of Pathology, Harbin Medical University, Harbin, Heilongjiang, P. R. China
| | - Guodong Yu
- Norwich Medical School, University of East Anglia, Norwich, Norfolk, United Kingdom
| | - Baolong Li
- Center of Safety Evaluation of Drugs, Heilongjiang University of Chinese Medicine, Harbin, Heilongjiang, P. R. China
| | - Darren W Sexton
- Norwich Medical School, University of East Anglia, Norwich, Norfolk, United Kingdom
| | - Thomas Wileman
- Norwich Medical School, University of East Anglia, Norwich, Norfolk, United Kingdom
| | - Alexandra A Roberts
- School of Pharmacy, University of East Anglia, Norwich, Norfolk, United Kingdom
| | - Chris J Hamilton
- School of Pharmacy, University of East Anglia, Norwich, Norfolk, United Kingdom
| | - Ruoxi Liu
- School of Chemistry, University of East Anglia, Norwich, Norfolk, United Kingdom
| | - Yimin Chao
- School of Chemistry, University of East Anglia, Norwich, Norfolk, United Kingdom
| | - Yujuan Shan
- School of Food Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, P. R. China
| | - Yongping Bao
- Norwich Medical School, University of East Anglia, Norwich, Norfolk, United Kingdom
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Hanschen FS, Herz C, Schlotz N, Kupke F, Bartolomé Rodríguez MM, Schreiner M, Rohn S, Lamy E. The Brassica epithionitrile 1-cyano-2,3-epithiopropane triggers cell death in human liver cancer cells in vitro. Mol Nutr Food Res 2015; 59:2178-89. [PMID: 26251050 DOI: 10.1002/mnfr.201500296] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Revised: 07/24/2015] [Accepted: 07/25/2015] [Indexed: 02/04/2023]
Abstract
SCOPE Glucosinolates are secondary metabolites present in Brassica vegetables. Alkenyl glucosinolates are enzymatically degraded forming nitriles or isothiocyanates, but in the presence of epithiospecifier protein, epithionitriles are released. However, studies on the occurrence of epithionitriles in Brassica food and knowledge about their biological effects are scarce. METHODS AND RESULTS Epithionitrile formation from glucosinolates of seven Brassica vegetables was analyzed using GC-MS and HPLC-DAD. Bioactivity of synthetic and plant-derived 1-cyano-2,3-epithiopropane (CETP) - the predominant epithionitrile in Brassica vegetables - in three human hepatocellular carcinoma (HCC) cell lines and primary murine hepatocytes was also evaluated. The majority of the Brassica vegetables were producers of nitriles or epithionitriles as hydrolysis products and not of isothiocyanates. For example, Brussels sprouts and savoy cabbage contained up to 0.8 μmol CETP/g vegetable. Using formazan dye assays, concentrations of 380-1500 nM CETP were observed to inhibit the mitochondrial dehydrogenase activity of human HCC cells without impairment of cell growth. At 100-fold higher CETP concentrations, cell death was observed. Presence of plant matrix increased CETP-based toxicity. CONCLUSION These in vitro data provide no indication that epithionitriles will severely affect human health by Brassica consumption. In contrast to isothiocyanates, no evidence of selective toxicity against HCC cells was found.
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Affiliation(s)
- Franziska S Hanschen
- Department of Quality, Leibniz-Institute of Vegetable and Ornamental Crops Großbeeren and Erfurt e.V, Großbeeren, Germany
| | - Corinna Herz
- Environmental Health Sciences, University Medical Center Freiburg, Freiburg i.Br, Germany
| | - Nina Schlotz
- Environmental Health Sciences, University Medical Center Freiburg, Freiburg i.Br, Germany
| | - Franziska Kupke
- Environmental Health Sciences, University Medical Center Freiburg, Freiburg i.Br, Germany.,Institute of Food Chemistry, Hamburg School of Food Science, University of Hamburg, Hamburg, Germany
| | - María M Bartolomé Rodríguez
- Clinic for Internal Medicine II, Molecular Biology, University Medical Center Freiburg, Freiburg i.Br, Germany
| | - Monika Schreiner
- Department of Quality, Leibniz-Institute of Vegetable and Ornamental Crops Großbeeren and Erfurt e.V, Großbeeren, Germany
| | - Sascha Rohn
- Institute of Food Chemistry, Hamburg School of Food Science, University of Hamburg, Hamburg, Germany
| | - Evelyn Lamy
- Environmental Health Sciences, University Medical Center Freiburg, Freiburg i.Br, Germany
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Glade MJ, Meguid MM. A Glance at… Broccoli, glucoraphanin, and sulforaphane. Nutrition 2015; 31:1175-8. [PMID: 26004191 DOI: 10.1016/j.nut.2015.03.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2015] [Revised: 03/06/2015] [Accepted: 03/08/2015] [Indexed: 02/07/2023]
Affiliation(s)
| | - Michael M Meguid
- Professor Emeritus, Surgery, Neuroscience and Nutrition, Department of Surgery, University Hospital, Upstate Medical University, Syracuse, New York
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Hussain A, Mohsin J, Prabhu SA, Begum S, Nusri QEA, Harish G, Javed E, Khan MA, Sharma C. Sulforaphane inhibits growth of human breast cancer cells and augments the therapeutic index of the chemotherapeutic drug, gemcitabine. Asian Pac J Cancer Prev 2015; 14:5855-60. [PMID: 24289589 DOI: 10.7314/apjcp.2013.14.10.5855] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Phytochemicals are among the natural chemopreventive agents with most potential for delaying, blocking or reversing the initiation and promotional events of carcinogenesis. They therefore offer cancer treatment strategies to reduce cancer related death. One such promising chemopreventive agent which has attracted considerable attention is sulforaphane (SFN), which exhibits anti-cancer, anti-diabetic, and anti-microbial properties. The present study was undertaken to assess effect of SFN alone and in combination with a chemotherapeutic agent, gemcitabine, on the proliferative potential of MCF-7 cells by cell viability assay and authenticated the results by nuclear morphological examination. Further we analyzed the modulation of expression of Bcl-2 and COX-2 on treatment of these cells with SFN by RT-PCR. SFN showed cytotoxic effects on MCF-7 cells in a dose- and time-dependent manner via an apoptotic mode of cell death. In addition, a combinational treatment of SFN and gemcitabine on MCF-7 cells resulted in growth inhibition in a synergistic manner with a combination index (CI) <1. Notably, SFN was found to significantly downregulate the expression of Bcl-2, an anti-apoptotic gene, and COX-2, a gene involved in inflammation, in a time-dependent manner. These results indicate that SFN induces apoptosis and anti-inflammatory effects on MCF-7 cells via downregulation of Bcl-2 and COX-2 respectively. The combination of SFN and gemcitabine may potentiate the efficacy of gemcitabine and minimize the toxicity to normal cells. Taken together, SFN may be a potent anti-cancer agent for breast cancer treatment.
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Affiliation(s)
- Arif Hussain
- Department of Biotechnology, Manipal University, Dubai, United Arab Emirates E-mail :
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Øverby A, Bævre MS, Thangstad OP, Bones AM. Disintegration of microtubules in Arabidopsis thaliana and bladder cancer cells by isothiocyanates. FRONTIERS IN PLANT SCIENCE 2015; 6:6. [PMID: 25657654 PMCID: PMC4303138 DOI: 10.3389/fpls.2015.00006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Accepted: 01/05/2015] [Indexed: 05/08/2023]
Abstract
Isothiocyanates (ITCs) from biodegradation of glucosinolates comprise a group of electrophiles associated with growth-inhibitory effects in plant- and mammalian cells. The underlying modes of action of this feature are not fully understood. Clarifying this has involved mammalian cancer cells due to ITCs' chemopreventive potential. The binding of ITCs to tubulins has been reported as a mechanism by which ITCs induce cell cycle arrest and apoptosis. In the present study we demonstrate that ITCs disrupt microtubules in Arabidopsis thaliana contributing to the observed inhibited growth phenotype. We also confirmed this in rat bladder cancer cells (AY-27) suggesting that cells from plant and animals share mechanisms by which ITCs affect growth. Exposure of A. thaliana to vapor-phase of allyl ITC (AITC) inhibited growth and induced a concurrent bleaching of leaves in a dose-dependent manner. Transcriptional analysis was used to show an upregulation of heat shock-genes upon AITC-treatment. Transgenic A. thaliana expressing GFP-marked α-tubulin was employed to show a time- and dose-dependent disintegration of microtubules by AITC. Treatment of AY-27 with ITCs resulted in a time- and dose-dependent decrease of cell proliferation and G2/M-arrest. AY-27 transiently transfected to express GFP-tagged α-tubulin were treated with ITCs resulting in a loss of microtubular filaments and the subsequent formation of apoptotic bodies. In conclusion, our data demonstrate an ITC-induced mechanism leading to growth inhibition in A. thaliana and rat bladder cancer cells, and expose clues to the mechanisms underlying the physiological role of glucosinolates in vivo.
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Affiliation(s)
- Anders Øverby
- *Correspondence: Anders Øverby and Atle M. Bones, Department of Biology, Norwegian University of Science and Technology (NTNU), Høgskoleringen 5, N-7491 Trondheim, Norway e-mail: ;
| | | | | | - Atle M. Bones
- *Correspondence: Anders Øverby and Atle M. Bones, Department of Biology, Norwegian University of Science and Technology (NTNU), Høgskoleringen 5, N-7491 Trondheim, Norway e-mail: ;
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Hanschen FS, Lamy E, Schreiner M, Rohn S. Reactivity and stability of glucosinolates and their breakdown products in foods. Angew Chem Int Ed Engl 2014; 53:11430-50. [PMID: 25163974 DOI: 10.1002/anie.201402639] [Citation(s) in RCA: 200] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Indexed: 12/25/2022]
Abstract
The chemistry of glucosinolates and their behavior during food processing is very complex. Their instability leads to the formation of a bunch of breakdown and reaction products that are very often reactive themselves. Although excessive consumption of cabbage varieties has been thought for long time to have adverse, especially goitrogenic effects, nowadays, epidemiologic studies provide data that there might be beneficial health effects as well. Especially Brassica vegetables, such as broccoli, radish, or cabbage, are rich in these interesting plant metabolites. However, information on the bioactivity of glucosinolates is only valuable when one knows which compounds are formed during processing and subsequent consumption. This review provides a comprehensive, in-depth overview on the chemical reactivity of different glucosinolates and breakdown products thereof during food preparation.
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Affiliation(s)
- Franziska S Hanschen
- Department of Quality, Leibniz-Institute of Vegetable and Ornamental Crops Großbeeren and Erfurt e.V. Theodor-Echtermeyer-Weg 1, 14979 Großbeeren (Germany) http://www.igzev.de.
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Hanschen FS, Lamy E, Schreiner M, Rohn S. Reaktivität und Stabilität von Glucosinolaten und ihren Abbauprodukten in Lebensmitteln. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402639] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Choi BH, Kang KS, Kwak MK. Effect of redox modulating NRF2 activators on chronic kidney disease. Molecules 2014; 19:12727-59. [PMID: 25140450 PMCID: PMC6271622 DOI: 10.3390/molecules190812727] [Citation(s) in RCA: 115] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 08/06/2014] [Accepted: 08/12/2014] [Indexed: 12/16/2022] Open
Abstract
Chronic kidney disease (CKD) is featured by a progressive decline of kidney function and is mainly caused by chronic diseases such as diabetes mellitus and hypertension. CKD is a complex disease due to cardiovascular complications and high morbidity; however, there is no single treatment to improve kidney function in CKD patients. Since biological markers representing oxidative stress are significantly elevated in CKD patients, oxidative stress is receiving attention as a contributing factor to CKD pathology. Nuclear factor erythroid-2 related factor 2 (NRF2) is a predominant transcription factor that regulates the expression of a wide array of genes encoding antioxidant proteins, thiol molecules and their generating enzymes, detoxifying enzymes, and stress response proteins, all of which can counteract inflammatory and oxidative damages. There is considerable experimental evidence suggesting that NRF2 signaling plays a protective role in renal injuries that are caused by various pathologic conditions. In addition, impaired NRF2 activity and consequent target gene repression have been observed in CKD animals. Therefore, a pharmacological intervention activating NRF2 signaling can be beneficial in protecting against kidney dysfunction in CKD. This review article provides an overview of the role of NRF2 in experimental CKD models and describes current findings on the renoprotective effects of naturally occurring NRF2 activators, including sulforaphane, resveratrol, curcumin, and cinnamic aldehyde. These experimental results, coupled with recent clinical experiences with a synthetic triterpenoid, bardoxolone methyl, have brought a light of hope for ameliorating CKD progression by preventing oxidative stress and maintaining cellular redox homeostasis.
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Affiliation(s)
- Bo-hyun Choi
- College of Pharmacy, The Catholic University of Korea, Bucheon, Gyeonggi-do 420-743, Korea.
| | - Kyung-Shin Kang
- Daewon Foreign Language High School, Kwangjin-gu, Seoul 143-713, Korea.
| | - Mi-Kyoung Kwak
- College of Pharmacy, The Catholic University of Korea, Bucheon, Gyeonggi-do 420-743, Korea.
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Azarenko O, Jordan MA, Wilson L. Erucin, the major isothiocyanate in arugula (Eruca sativa), inhibits proliferation of MCF7 tumor cells by suppressing microtubule dynamics. PLoS One 2014; 9:e100599. [PMID: 24950293 PMCID: PMC4065051 DOI: 10.1371/journal.pone.0100599] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Accepted: 05/28/2014] [Indexed: 01/25/2023] Open
Abstract
Consumption of cruciferous vegetables is associated with reduced risk of various types of cancer. Isothiocyanates including sulforaphane and erucin are believed to be responsible for this activity. Erucin [1-isothiocyanato-4-(methylthio)butane], which is metabolically and structurally related to sulforaphane, is present in large quantities in arugula (Eruca sativa, Mill.), kohlrabi and Chinese cabbage. However, its cancer preventive mechanisms remain poorly understood. We found that erucin inhibits proliferation of MCF7 breast cancer cells (IC50 = 28 µM) in parallel with cell cycle arrest at mitosis (IC50 = 13 µM) and apoptosis, by a mechanism consistent with impairment of microtubule dynamics. Concentrations of 5-15 µM erucin suppressed the dynamic instability of microtubules during interphase in the cells. Most dynamic instability parameters were inhibited, including the rates and extents of growing and shortening, the switching frequencies between growing and shortening, and the overall dynamicity. Much higher erucin concentrations were required to reduce the microtubule polymer mass. In addition, erucin suppressed dynamic instability of microtubules reassembled from purified tubulin in similar fashion. The effects of erucin on microtubule dynamics, like those of sulforaphane, are similar qualitatively to those of much more powerful clinically-used microtubule-targeting anticancer drugs, including taxanes and the vinca alkaloids. The results suggest that suppression of microtubule dynamics by erucin and the resulting impairment of critically important microtubule-dependent cell functions such as mitosis, cell migration and microtubule-based transport may be important in its cancer preventive activities.
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Affiliation(s)
- Olga Azarenko
- Department of Molecular, Cellular, and Developmental Biology, and the Neuroscience Research Institute, University of California Santa Barbara, Santa Barbara, California, United States of America
| | - Mary Ann Jordan
- Department of Molecular, Cellular, and Developmental Biology, and the Neuroscience Research Institute, University of California Santa Barbara, Santa Barbara, California, United States of America
| | - Leslie Wilson
- Department of Molecular, Cellular, and Developmental Biology, and the Neuroscience Research Institute, University of California Santa Barbara, Santa Barbara, California, United States of America
- * E-mail:
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Oliviero T, Verkerk R, Vermeulen M, Dekker M. In vivo formation and bioavailability of isothiocyanates from glucosinolates in broccoli as affected by processing conditions. Mol Nutr Food Res 2014; 58:1447-56. [PMID: 24687744 DOI: 10.1002/mnfr.201300894] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Revised: 02/10/2014] [Accepted: 02/19/2014] [Indexed: 11/08/2022]
Abstract
SCOPE To study the effect of residual myrosinase (MYR) activity in differently processed broccoli on sulforaphane (SR) and iberin (IB) formation, bioavailability, and excretion in human volunteers. METHODS AND RESULTS Five different broccoli products were obtained with similar glucoraphanin (GR) and glucoiberin (GI) content, yet different MYR activity. Excretion of SR and IB conjugates in urine were determined in 15 participants after ingestion of the broccoli products. A reduction of 80% of MYR in the product did not cause differences in the total amount of SR and IB found in urine compared to the product with 100% MYR. Complete inactivation of MYR gave the lowest total amount of SR and IB in urine (10 and 19%). A residual MYR of only 2% in the product gave an intermediate amount (17 and 29%). The excretion half-lives of SR and IB conjugates were comparable for all the products (2.5 h on average), although the maximum excretion peak times were clearly shorter when the residual MYR was higher (2.3-6.1 h). CONCLUSION For the first time, the effect of residual MYR activity on isothiocyanate bioavailability was systematically and quantitatively studied. Processing conditions have a large effect on the kinetics and bioavailability of isothiocyanates from broccoli.
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Affiliation(s)
- Teresa Oliviero
- Food Quality and Design Group, Wageningen University, Wageningen, The Netherlands
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35
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Abstract
Cancer is a complex disease characterized by multiple genetic and molecular alterations involving transformation, deregulation of apoptosis, proliferation, invasion, angiogenesis, and metastasis. To grow, invade, and metastasize, tumors need host components and primary dysfunction in the tumor microenvironment, in addition to cell dysfunction, can be crucial for carcinogenesis. A great variety of phytochemicals have been shown to be potentially capable of inhibiting and modulating several relevant targets simultaneously and is therefore non-specific. Because of the enormous biological diversity of cancer, this pleiotropism might constitute an advantage. Phytochemicals, in particular diet-derived compounds, have therefore been proposed and applied in clinical trials as cancer chemopreventive/chemotherapeutic agents. Sulforaphane (SFN) is an isothiocyanate found in cruciferous vegetables. SFN has proved to be an effective chemoprotective agent in cell culture, in carcinogen-induced and genetic animal cancer models, as well as in xenograft models of cancer. It promoted potent cytostatic and cytotoxic effects orchestrated by the modulation of different molecular targets. Cell vulnerability to SFN-mediated apoptosis was subject to regulation by cell-cycle-dependent mechanisms but was independent of a mutated p53 status. Moreover, combination of SFN with cytotoxic therapy potentiated the cytotoxic effect mediated by chemotherapy in vitro, thus suggesting its potential therapeutic benefit in clinical settings. Overall, SFN appears to be an effective and safe chemopreventive molecule and a promising tool to fight cancer.
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Kumar H, Kim IS, More SV, Kim BW, Choi DK. Natural product-derived pharmacological modulators of Nrf2/ARE pathway for chronic diseases. Nat Prod Rep 2014; 31:109-39. [DOI: 10.1039/c3np70065h] [Citation(s) in RCA: 248] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Houghton CA, Fassett RG, Coombes JS. Sulforaphane: translational research from laboratory bench to clinic. Nutr Rev 2013; 71:709-26. [PMID: 24147970 DOI: 10.1111/nure.12060] [Citation(s) in RCA: 125] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Cruciferous vegetables are widely acknowledged to provide chemopreventive benefits in humans, but they are not generally consumed at levels that effect significant change in biomarkers of health. Because consumers have embraced the notion that dietary supplements may prevent disease, this review considers whether an appropriately validated sulforaphane-yielding broccoli sprout supplement may deliver clinical benefit. The crucifer-derived bioactive phytochemical sulforaphane is a significant inducer of nuclear factor erythroid 2-related factor 2 (Nrf2), the transcription factor that activates the cell's endogenous defenses via a battery of cytoprotective genes. For a broccoli sprout supplement to demonstrate bioactivity in vivo, it must retain both the sulforaphane-yielding precursor compound, glucoraphanin, and the activity of glucoraphanin's intrinsic myrosinase enzyme. Many broccoli sprout supplements are myrosinase inactive, but current labeling does not reflect this. For the benefit of clinicians and consumers, this review summarizes the findings of in vitro studies and clinical trials, interpreting them in the context of clinical relevance. Standardization of sulforaphane nomenclature and assay protocols will be necessary to remove inconsistency and ambiguity in the labeling of currently available broccoli sprout products.
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Affiliation(s)
- Christine A Houghton
- School of Human Movement Studies, University of Queensland, Brisbane, Queensland, Australia
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Araki R, Hasumi A, Nishizawa OI, Sasaki K, Kuwahara A, Sawada Y, Totoki Y, Toyoda A, Sakaki Y, Li Y, Saito K, Ogawa T, Hirai MY. Novel bioresources for studies of Brassica oleracea: identification of a kale MYB transcription factor responsible for glucosinolate production. PLANT BIOTECHNOLOGY JOURNAL 2013; 11:1017-27. [PMID: 23910994 DOI: 10.1111/pbi.12095] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2013] [Revised: 05/27/2013] [Accepted: 06/09/2013] [Indexed: 05/21/2023]
Abstract
Plants belonging to the Brassicaceae family exhibit species-specific profiles of glucosinolates (GSLs), a class of defence compounds against pathogens and insects. GSLs also exhibit various human health-promoting properties. Among them, glucoraphanin (aliphatic 4-methylsulphinylbutyl GSL) has attracted the most attention because it hydrolyses to form a potent anticancer compound. Increased interest in developing commercial varieties of Brassicaceae crops with desirable GSL profiles has led to attempts to identify genes that are potentially valuable for controlling GSL biosynthesis. However, little attention has been focused on genes of kale (Brassica oleracea var. acephala). In this study, we established full-length kale cDNA libraries containing 59 904 clones, which were used to generate an expressed sequence tag (EST) data set with 119 204 entries. The EST data set clarified genes related to the GSL biosynthesis pathway in kale. We specifically focused on BoMYB29, a homolog of Arabidopsis MYB29/PMG2/HAG3, not only to characterize its function but also to demonstrate its usability as a biological resource. BoMYB29 overexpression in wild-type Arabidopsis enhanced the expression of aliphatic GSL biosynthetic genes and the accumulation of aliphatic GSLs. When expressed in the myb28myb29 mutant, which exhibited no detectable aliphatic GSLs, BoMYB29 restored the expression of biosynthetic genes and aliphatic GSL accumulation. Interestingly, the ratio of methylsulphinyl GSL content, including glucoraphanin, to that of methylthio GSLs was greatly increased, indicating the suitability of BoMYB29 as a regulator for increasing methylsulphinyl GSL content. Our results indicate that these biological resources can facilitate further identification of genes useful for modifications of GSL profiles and accumulation in kale.
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Affiliation(s)
- Ryoichi Araki
- Central Laboratories for Frontier Technology, Kirin Holdings Company, Ltd., Yokohama, Kanagawa, Japan; RIKEN Plant Science Center, Yokohama, Kanagawa, Japan
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Mullaney JA, Kelly WJ, McGhie TK, Ansell J, Heyes JA. Lactic acid bacteria convert glucosinolates to nitriles efficiently yet differently from enterobacteriaceae. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:3039-46. [PMID: 23461529 DOI: 10.1021/jf305442j] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Glucosinolates from the genus Brassica can be converted into bioactive compounds known to induce phase II enzymes, which may decrease the risk of cancers. Conversion via hydrolysis is usually by the brassica enzyme myrosinase, which can be inactivated by cooking or storage. We examined the potential of three beneficial bacteria, Lactobacillus plantarum KW30, Lactococcus lactis subsp. lactis KF147, and Escherichia coli Nissle 1917, and known myrosinase-producer Enterobacter cloacae to catalyze the conversion of glucosinolates in broccoli extract. Enterobacteriaceae consumed on average 65% glucoiberin and 78% glucoraphanin, transforming them into glucoiberverin and glucoerucin, respectively, and small amounts of iberverin nitrile and erucin nitrile. The lactic acid bacteria did not accumulate reduced glucosinolates, consuming all at 30-33% and transforming these into iberverin nitrile, erucin nitrile, sulforaphane nitrile, and further unidentified metabolites. Adding beneficial bacteria to a glucosinolate-rich diet may increase glucosinolate transformation, thereby increasing host exposure to bioactives.
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Affiliation(s)
- Jane A Mullaney
- Riddet Institute, Massey University , Private Bag 11222, Palmerston North, New Zealand
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Kou X, Kirberger M, Yang Y, Chen N. Natural products for cancer prevention associated with Nrf2–ARE pathway. FOOD SCIENCE AND HUMAN WELLNESS 2013. [DOI: 10.1016/j.fshw.2013.01.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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Shiizaki K, Kawanishi M, Yagi T. Dioxin suppresses benzo[a]pyrene-induced mutations and DNA adduct formation through cytochrome P450 1A1 induction and (±)-anti-benzo[a]pyrene-7,8-diol-9,10-epoxide inactivation in human hepatoma cells. Mutat Res 2013; 750:77-85. [PMID: 23036853 DOI: 10.1016/j.mrgentox.2012.09.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2012] [Revised: 09/19/2012] [Accepted: 09/24/2012] [Indexed: 06/01/2023]
Abstract
Benzo[a]pyrene (BaP) is metabolically activated by cytochrome P450 enzymes, and forms DNA adduct leading to mutations. Cytochrome P450 1A1 plays a central role in this activation step, and this enzyme is strongly induced by chemical agents that bind to the aryl hydrocarbon receptor (AhR), which is also known as a dioxin receptor. 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD), a potent AhR ligand has not been shown to form any DNA adduct, but has a possibility to aggravate the toxicity of precarcinogenic polycyclic hydrocarbons through the induction of metabolic enzymes. We treated human hepatoma cells (HepG2) with TCDD, and subsequently exposed them to BaP to elucidate the synergistic effects on mutations. Surprisingly, mutant frequency induced by BaP at the hypoxanthine-guanine phosphribosyltransferase (HPRT) locus was decreased by pretreatment with TCDD. In correlation with decrease in the mutant frequencies, BaP-DNA adduct formation was also decreased by TCDD pretreatment. This suppressive effect of TCDD was more potent when the cells were exposed to (±)-anti-benzo[a]pyrene-7,8-diol-9,10-epoxide (BPDE), a reactive metabolic intermediate of BaP. Among the enzymes catalyzing BaP oxidation and conjugation, cytochrome P450 1A1, 1A2, 3A4 and UDP-glucuronosyltransferase 1A1 mRNAs were induced by the exposure to TCDD. In cytochrome P450 1A1-deficient murine cells and cytochrome P450 1A1-uninducible human cells, TCDD could not suppress BPDE-DNA adduct formation. Further experiments using "Tet-On" cytochrome P450 1A1-overexpressing cells and a recombinant cytochrome P450 1A1 enzyme demonstrated that this is the key enzyme involved in the biotransformation of BaP, that is, both production and inactivation of BPDE. We conclude that TCDD-induced cytochrome P450 catalyzes the metabolism of BPDE to as yet-unidentified products that are not apparently DNA-reactive, thereby reducing mutations in hepatoma cells.
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Affiliation(s)
- Kazuhiro Shiizaki
- Laboratory of Environmental Genetics, Frontier Science Innovation Center, Osaka Prefecture University, Gakuen-cho, Sakai, Osaka, Japan
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Nuclear factor κB down-regulates human UDP-glucuronosyltransferase 1A1: a novel mechanism involved in inflammation-associated hyperbilirubinaemia. Biochem J 2013; 449:761-70. [DOI: 10.1042/bj20121055] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Jaundice or hyperbilirubinaemia is a common complication of sepsis. UGT1A1 (UDP-glucuronosyltransferase 1A1) is a critical gene for bilirubin metabolism and irinotecan detoxification. However, the molecular pathogenesis of hyperbilirubinaemia during inflammation needs to be further clarified. Human hepatic UGT1A1 expression was analysed by RT (reverse transcription)–PCR, qRT-PCR (quantitative real-time PCR) and Western blotting in response to LPS (lipopolysaccharide) stimulation. Transcription regulatory elements in the upstream promoter region of the human UGT1A1 gene were determined using EMSA (electrophoretic mobility-shift assay) and ChIP (chromatin immunoprecipitation). The important role of the transcription regulatory element was examined using a luciferase assay, and was determined by qRT-PCR using a transcription factor activation inhibitor. LPS down-regulated the UGT1A1 mRNA expression in human hepatoma cell lines. A newly identified NF-κB (nuclear factor κB)-binding site was located on the upstream promoter region (−725/−716) of the human UGT1A1 gene. LPS-induced NF-κB activation and specific binding to the NF-κB-binding site can suppress human UGT1A1 promoter activity and human UGT1A1 expression. We demonstrated that LPS mediates the suppression of human UGT1A1 expression through specific binding of NF-κB to this newly identified NF-κB-binding site in the upstream promoter of the human UGT1A1 gene. The present study may partly explain the molecular pathogenesis of inflammation-associated hyperbilirubinaemia.
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Aras U, Gandhi YA, Masso-Welch PA, Morris ME. Chemopreventive and anti-angiogenic effects of dietary phenethyl isothiocyanate in an N-methyl nitrosourea-induced breast cancer animal model. Biopharm Drug Dispos 2012; 34:98-106. [PMID: 23138465 DOI: 10.1002/bdd.1826] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Revised: 10/18/2012] [Accepted: 11/02/2012] [Indexed: 12/21/2022]
Abstract
The effect of phenethyl isothiocyanate (PEITC), a component of cruciferous vegetables, on the initiation and progression of cancer was investigated in a chemically induced estrogen-dependent breast cancer model. Breast cancer was induced in female Sprague Dawley rats (8 weeks old) by the administration of N-methyl nitrosourea (NMU). Animals were administered 50 or 150 µmol/kg oral PEITC and monitored for tumor appearance for 18 weeks. The PEITC treatment prolonged the tumor-free survival time and decreased the tumor incidence and multiplicity. The time to the first palpable tumor was prolonged from 69 days in the control, to 84 and 88 days in the 50 and 150 µmol/kg PEITC-treated groups. The tumor incidence in the control, 50 µmol/kg, and 150 µmol/kg PEITC-treated groups was 56.6%, 25.0% and 17.2%, while the tumor multiplicity was 1.03, 0.25 and 0.21, respectively. Differences were statistically significant (p < 0.05) from the control, but there were no significant differences between the two dose levels. The intratumoral capillary density decreased from 4.21 ± 0.30 vessels per field in the controls to 2.46 ± 0.25 in the 50 µmol/kg and 2.36 ± 0.23 in the 150 µmol/kg PEITC-treated animals. These studies indicate that supplementation with PEITC prolongs the tumor-free survival, reduces tumor incidence and burden, and is chemoprotective in NMU-induced estrogen-dependent breast cancer in rats. For the first time, it is reported that PEITC has anti-angiogenic effects in a chemically induced breast cancer animal model, representing a potentially significant mechanism contributing to its chemopreventive activity.
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Affiliation(s)
- Urvi Aras
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, University at Buffalo, State University of New York, Buffalo, NY 14214-8033, USA
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Sharma R, Sharma A, Chaudhary P, Sahu M, Jaiswal S, Awasthi S, Awasthi YC. Role of 4-hydroxynonenal in chemopreventive activities of sulforaphane. Free Radic Biol Med 2012; 52:2177-85. [PMID: 22579574 PMCID: PMC3377772 DOI: 10.1016/j.freeradbiomed.2012.04.012] [Citation(s) in RCA: 203] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2011] [Revised: 04/05/2012] [Accepted: 04/06/2012] [Indexed: 11/19/2022]
Abstract
Chemoprevention of cancer via herbal and dietary supplements is a logical approach to combating cancer and currently it is an attractive area of research investigation. Over the years, isothiocyanates, such as sulforaphane (SFN) found in cruciferous vegetables, have been advocated as chemopreventive agents, and their efficacy has been demonstrated in cell lines and animal models. In vivo studies with SFN suggest that in addition to protecting normal healthy cells from environmental carcinogens, it also exhibits cytotoxicity and apoptotic effects against various cancer cell types. Among several mechanisms for the chemopreventive activity of SFN against chemical carcinogenesis, its effect on drug-metabolizing enzymes that cause activation/neutralization of carcinogenic metabolites is well established. Recent studies suggest that SFN exerts its selective cytotoxicity to cancer cells via reactive oxygen species-mediated generation of lipid peroxidation products, particularly 4-hydroxynonenal (HNE). Against the background of the known biochemical effects of SFN on normal and cancer cells, in this article we review the underlying molecular mechanisms responsible for the overall chemopreventive effects of SFN, focusing on the role of HNE in these mechanisms, which may also contribute to its selective cytotoxicity to cancer cells.
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Affiliation(s)
- Rajendra Sharma
- Department of Molecular Biology and Immunology, University of North Texas Health Science Center, Fort Worth, TX
| | - Abha Sharma
- Department of Molecular Biology and Immunology, University of North Texas Health Science Center, Fort Worth, TX
| | - Pankaj Chaudhary
- Department of Molecular Biology and Immunology, University of North Texas Health Science Center, Fort Worth, TX
| | - Mukesh Sahu
- Department of Molecular Biology and Immunology, University of North Texas Health Science Center, Fort Worth, TX
| | - Shailesh Jaiswal
- Department of Molecular Biology and Immunology, University of North Texas Health Science Center, Fort Worth, TX
| | - Sanjay Awasthi
- Department of Diabetes, Endocrinology & Metabolism, City of Hope-NCI designated comprehensive Cancer Center, Duarte, CA
| | - Yogesh C. Awasthi
- Department of Molecular Biology and Immunology, University of North Texas Health Science Center, Fort Worth, TX
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Hanschen FS, Platz S, Mewis I, Schreiner M, Rohn S, Kroh LW. Thermally induced degradation of sulfur-containing aliphatic glucosinolates in broccoli sprouts (Brassica oleracea var. italica) and model systems. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2012; 60:2231-2241. [PMID: 22321130 DOI: 10.1021/jf204830p] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Processing reduces the glucosinolate (GSL) content of plant food, among other aspects due to thermally induced degradation. Since there is little information about the thermal stability of GSL and formation of corresponding breakdown products, the thermally induced degradation of sulfur-containing aliphatic GSL was studied in broccoli sprouts and with isolated GSL in dry medium at different temperatures as well as in aqueous medium at different pH values. Desulfo-GSL have been analyzed with HPLC-DAD, while breakdown products were estimated using GC-FID. Whereas in the broccoli sprouts structural differences of the GSL with regard to thermal stability exist, the various isolated sulfur-containing aliphatic GSL degraded nearly equally and were in general more stable. In broccoli sprouts, methylsulfanylalkyl GSL were more susceptible to degradation at high temperatures, whereas methylsulfinylalkyl GSL were revealed to be more affected in aqueous medium under alkaline conditions. Besides small amounts of isothiocyanates, the main thermally induced breakdown products of sulfur-containing aliphatic GSL were nitriles. Although they were most rapidly formed at comparatively high temperatures under dry heat conditions, their highest concentrations were found after cooking in acidic medium, conditions being typical for domestic processing.
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Affiliation(s)
- Franziska S Hanschen
- Department of Food Chemistry and Analysis, Institute of Food Technology and Food Chemistry, Technische Universität Berlin, Berlin, Germany
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Epigenetic and antioxidant effects of dietary isothiocyanates and selenium: potential implications for cancer chemoprevention. Proc Nutr Soc 2012; 71:237-45. [DOI: 10.1017/s002966511200016x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
There is evidence from epidemiological studies suggesting that increased consumption of cruciferous vegetables may protect against specific cancers more effectively than total fruit and vegetable intake. These beneficial effects are attributed to the glucosinolate breakdown products, isothiocyanates (ITC). Similarly, selenium (Se) consumption has also been inversely associated with cancer risk and as an integral part of many selenoproteins may influence multiple pathways in the development of cancer. This paper will briefly review the current state of knowledge concerning the effect of Se and ITC in cancer development with a particular emphasis on its antioxidant properties, and will also address whether alterations in DNA methylation may be a potential mechanism whereby these dietary constituents protect against the carcinogenic process. Furthermore, we will discuss the advantages of combining ITC and Se to benefit from their complementary mechanisms of action to potentially protect against the alterations leading to neoplasia. Based on this review it may be concluded that an understanding of the impact of ITC and Se on aberrant DNA methylation in relation to factors modulating gene-specific and global methylation patterns, in addition to the effect of these food constituents as modulators of key selenoenzymes, such as gastrointestinal glutathione peroxidase-2 (GPx2) and thioredoxin reductase-1 (TrxR1), may provide insights into the potential synergy among various components of a plant-based diet that may counteract the genetic and epigenetic alterations that initiate and sustain neoplasia.
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Kato M, Imayoshi Y, Iwabuchi H, Shimomura K. Kinetic changes in glucosinolate-derived volatiles by heat-treatment and myrosinase activity in nakajimana (Brassica rapa L. cv. nakajimana). JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2011; 59:11034-11039. [PMID: 21913666 DOI: 10.1021/jf201626z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Nakajimana (Brassica rapa L. cv. nakajimana), of the family Brassicaceae, is a traditional vegetable in Japan. Three isothiocyanates and five cyanides in the leaves of nakajimana were identified by gas chromatography (GC) and GC-mass spectrometry (GC-MS), and their kinetic changes using heat-treatment (temperature and time) were investigated. In addition, myrosinase activity of extracts prepared from fresh nakajimana leaf was determined. In crushed heat-treated leaves of nakajimana (70 °C for 30 s), formation of isothiocyanates and myrosinase activity increased, whereas formation of 1-cyano-3,4-epithiobutane and 1-cyano-4,5-epithiopentane decreased. Heat-treatment can significantly alter the content of potentially beneficial compounds in nakajimana, and ingestion of suitable isothiocyanates for human health may be better facilitated by mild boiling.
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Affiliation(s)
- Mika Kato
- Graduate School of Life Sciences, Toyo University, 1-1-1 Izumino, Itakura-machi, Oura-gun, Gunma 374-0193, Japan
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Navarro SL, Li F, Lampe JW. Mechanisms of action of isothiocyanates in cancer chemoprevention: an update. Food Funct 2011; 2:579-87. [PMID: 21935537 PMCID: PMC3204939 DOI: 10.1039/c1fo10114e] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Isothiocyanates (ITC), derived from glucosinolates, are thought to be responsible for the chemoprotective actions conferred by higher cruciferous vegetable intake. Evidence suggests that isothiocyanates exert their effects through a variety of distinct but interconnected signaling pathways important for inhibiting carcinogenesis, including those involved in detoxification, inflammation, apoptosis, and cell cycle and epigenetic regulation, among others. This article provides an update on the latest research on isothiocyanates and these mechanisms, and points out remaining gaps in our understanding of these events. Given the variety of ITC produced from glucosinolates, and the diverse pathways on which these compounds act, a systems biology approach, in vivo, may help to better characterize their integrated role in cancer prevention. In addition, the effects of dose, duration of exposure, and specificity of different ITC should be considered.
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Affiliation(s)
- Sandi L. Navarro
- Fred Hutchinson Cancer Research Center, Division of Public Health Sciences, Seattle, WA, 98109
- Interdisciplinary Graduate Program in Nutritional Sciences, Department of Epidemiology, University of Washington, Seattle, WA 98195
| | - Fei Li
- Fred Hutchinson Cancer Research Center, Division of Public Health Sciences, Seattle, WA, 98109
| | - Johanna W. Lampe
- Fred Hutchinson Cancer Research Center, Division of Public Health Sciences, Seattle, WA, 98109
- Interdisciplinary Graduate Program in Nutritional Sciences, Department of Epidemiology, University of Washington, Seattle, WA 98195
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Health benefits and possible risks of broccoli - an overview. Food Chem Toxicol 2011; 49:3287-309. [PMID: 21906651 DOI: 10.1016/j.fct.2011.08.019] [Citation(s) in RCA: 143] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Revised: 07/19/2011] [Accepted: 08/22/2011] [Indexed: 11/20/2022]
Abstract
Chemopreventive effects of broccoli, a highly valued vegetable, have been known for a long time. Several studies have demonstrated that broccoli might be beneficial by reducing the risk for the development of certain forms of cancer. These effects are generally attributed to glucosinolate-derived degradation products like isothiocyanates and indoles which are formed by the hydrolytic action of plant myrosinase and/or glucosidases deriving from the human microbial flora. However, recent in vitro and experimental animal studies indicate that broccoli, its extracts and the glucosinolate-derived degradation products might also have undesirable effects, especially genotoxic activities. However, the relevance of the genotoxic activities to human health is not known yet. This paper gives an overview on genotoxic, anti-genotoxic/chemopreventive, nutritive and antinutritive properties of broccoli, its ingredients and their degradation products. A qualitative comparison of the benefit and risk of broccoli consumption benefit-risk assessment shows that the benefit from intake in modest quantities and in processed form outweighs potential risks. For other preparations (fortified broccoli-based dietary supplements, diets with extraordinary high daily intake, consumption as a raw vegetable) further studies both for potential risks and beneficial effects are needed in order to assess the benefit and risk in the future.
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Radiosensitization of head and neck cancer cells by the phytochemical agent sulforaphane. Strahlenther Onkol 2011; 187:575-80. [PMID: 21858418 DOI: 10.1007/s00066-011-2218-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2010] [Accepted: 02/04/2011] [Indexed: 12/21/2022]
Abstract
BACKGROUND AND PURPOSE Sulforaphane is a naturally occurring compound found in broccoli and other cruciferous vegetables. Recently it gained attention because of its antiproliferative properties in many cancer cell lines. The aim of this study was to investigate whether sulforaphane could act as a radiosensitizer in head and neck squamous cell carcinoma cell lines. MATERIALS AND METHODS Four head and neck squamous cell carcinoma cell lines (i.e., (HNSCC) SCC9, SCC25, CAL27, and FADU) were treated with sulforaphane and subsequently irradiated. Then proliferation and clonogenic assays were performed. Apoptosis was detected by flow cytometry. Possible regulation of Akt and Mcl-1 was investigated by western blotting. RESULTS Sulforaphane and radiation in combination leads to stronger inhibition of cell proliferation and of clonogenic survival than each treatment method alone. Western blot analysis of Akt and Mcl-1 showed no changed expression. CONCLUSION Sulforaphane is a promising agent in the treatment of head and neck cancer due to its antiproliferative and radio-sensitizing properties. A combination of sulforaphane and radiation decreases clonogenic survival. Apoptosis is not regulated through Akt or the Mcl-1 protein.
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