1
|
Surien O, Masre SF, Basri DF, Ghazali AR. Potential Chemopreventive Role of Pterostilbene in Its Modulation of the Apoptosis Pathway. Int J Mol Sci 2023; 24:ijms24119707. [PMID: 37298657 DOI: 10.3390/ijms24119707] [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: 02/25/2023] [Revised: 04/08/2023] [Accepted: 04/21/2023] [Indexed: 06/12/2023] Open
Abstract
Cancer incidence keeps increasing every year around the world and is one of the leading causes of death worldwide. Cancer has imposed a major burden on the human population, including the deterioration of physical and mental health as well as economic or financial loss among cancer patients. Conventional cancer treatments including chemotherapy, surgery, and radiotherapy have improved the mortality rate. However, conventional treatments have many challenges; for example, drug resistance, side effects, and cancer recurrence. Chemoprevention is one of the promising interventions to reduce the burden of cancer together with cancer treatments and early detection. Pterostilbene is a natural chemopreventive compound with various pharmacological properties such as anti-oxidant, anti-proliferative, and anti-inflammatory properties. Moreover, pterostilbene, due to its potential chemopreventive effect on inducing apoptosis in eliminating the mutated cells or preventing the progression of premalignant cells to cancerous cells, should be explored as a chemopreventive agent. Hence, in the review, we discuss the role of pterostilbene as a chemopreventive agent against various types of cancer via its modulation of the apoptosis pathway at the molecular levels.
Collapse
Affiliation(s)
- Omchit Surien
- Center for Toxicology and Health Risk Studies (CORE), Faculty of Health Sciences, Universiti Kebangsaan Malaysia (UKM), Kuala Lumpur 50300, Malaysia
| | - Siti Fathiah Masre
- Center for Toxicology and Health Risk Studies (CORE), Faculty of Health Sciences, Universiti Kebangsaan Malaysia (UKM), Kuala Lumpur 50300, Malaysia
| | - Dayang Fredalina Basri
- Center for Diagnostic, Therapeutic & Investigative Studies (CODTIS), Faculty of Health Sciences, Universiti Kebangsaan Malaysia (UKM), Kuala Lumpur 50300, Malaysia
| | - Ahmad Rohi Ghazali
- Center for Toxicology and Health Risk Studies (CORE), Faculty of Health Sciences, Universiti Kebangsaan Malaysia (UKM), Kuala Lumpur 50300, Malaysia
| |
Collapse
|
2
|
Francielli De Oliveira P, Leandro LF, Furtado RA, Ferreira NH, Pauletti PM, Barbosa Araújo AR, Uyemura SA, Tavares DC. Styrax camporum, a typical species of the Brazilian cerrado, attenuates DNA damage, preneoplastic lesions and oxidative stress in experimental rat colon carcinogenesis. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2021; 84:582-592. [PMID: 33825664 DOI: 10.1080/15287394.2021.1910090] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Styrax camporum Pohl, a typical species from the Brazilian cerrado, commonly known as "benjoeiro", is used to treat gastroduodenal diseases. In previous studies carried out by our research group, hydroalcoholic extract of S. camporum stems (SCHE) exhibited antigenotoxic and antiproliferative effects. For a comparative analysis of the chemopreventive effect of SCHE, the aim of this study was to investigate the influence of SCHE against carcinogen 1,2-dimethylhydrazine (DMH)-induced DNA damage and pre-neoplastic lesions in Wistar rat colon. Animals were treated orally with SCHE at 250, 500 or 1000 mg/kg body weight in conjunction with a subcutaneous injection of DMH. DNA damage was assessed using the comet assay while tpre-neoplastic lesions by aberrant crypt foci (ACF) assay. The following hepatic oxidative stress markers were determined including activities of catalase (CAT) and glutathione S-transferase (GST) as well as levels of reduced glutathione (GSH) and malondialdehyde (MDA). Treatment with SCHE was not genotoxic or carcinogenic at the highest dose tested (1000 mg/kg b.w.). The extract effectively inhibited DNA damage and pre-neoplastic lesions induced by DMH administration at all concentrations tested. Measurement of CAT, and GST activities and levels of GSH showed that SCHE did not reduce oxidative processes. In contrast, treatment with SCHE (1000 mg/kg b.w.) decreased liver MDA levels. Taken together, these findings suggested the chemopreventive effect attributed to SCHE in colon carcinogenesis, may be related to its capacity to inhibit DNA damage as well as an antioxidant action associated with its chemical constituents egonol and homoegonol.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Sérgio Akira Uyemura
- Faculdade de Ciências Farmacêuticas De Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil
| | | |
Collapse
|
3
|
Solubilization, stability and antioxidant activity of curcumin in a novel surfactant-free microemulsion system. Lebensm Wiss Technol 2021. [DOI: 10.1016/j.lwt.2021.111583] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
4
|
Feng S, Qi K, Guo Y, Wang J, Gu G, Liu P, Ma J, Qu L, Zhang S. A novel synthesis of 2-((2-oxopropyl)selanyl) benzamide derivatives by cascade selenenylation-acylation reaction and in vitro cytotoxicity evaluation. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152561] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
5
|
Pratap S, Dev A, Kumar V, Yadav R, Narwal M, Tomar S, Kumar P. Structure of Chorismate Mutase-like Domain of DAHPS from Bacillus subtilis Complexed with Novel Inhibitor Reveals Conformational Plasticity of Active Site. Sci Rep 2017; 7:6364. [PMID: 28743924 PMCID: PMC5526877 DOI: 10.1038/s41598-017-06578-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 06/08/2017] [Indexed: 01/23/2023] Open
Abstract
3-deoxy-D-arabino-heptulosonate-7-phosphate-synthase (DAHPS) is the first enzyme of the shikimate pathway and is responsible for the synthesis of aromatic amino acids in microorganisms. This pathway is an attractive target for antimicrobial drugs. In Bacillus subtilis, the N-terminal domain of the bifunctional DAHPS enzyme belongs to an AroQ class of chorismate mutase and is functionally homologous to the downstream AroH class chorismate mutase. This is the first structure of chorismate mutase, AroQ (BsCM_2) enzyme from Bacillus subtilis in complex with citrate and chlorogenic acid at 1.9 Å and 1.8 Å resolution, respectively. This work provides the structural basis of ligand binding into the active site of AroQ class of chorismate mutase, while accompanied by the conformational flexibility of active site loop. Molecular dynamics results showed that helix H2′ undergoes uncoiling at the first turn and increases the mobility of loop L1′. The side chains of Arg45, Phe46, Arg52 and Lys76 undergo conformational changes, which may play an important role in DAHPS regulation by the formation of the domain-domain interface. Additionally, binding studies showed that the chlorogenic acid binds to BsCM_2 with a higher affinity than chorismate. These biochemical and structural findings could lead to the development of novel antimicrobial drugs.
Collapse
Affiliation(s)
- Shivendra Pratap
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, 247667, India
| | - Aditya Dev
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, 247667, India
| | - Vijay Kumar
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, 247667, India
| | - Ravi Yadav
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, 247667, India
| | - Manju Narwal
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, 247667, India
| | - Shailly Tomar
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, 247667, India
| | - Pravindra Kumar
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, 247667, India.
| |
Collapse
|
6
|
Premkumar K, Thirunavukkarasu C, Abraham SK, Santhiya ST, Ramesh A. Protective effect of saffron (Crocus sativus L.) aqueous extract against genetic damage induced by anti-tumor agents in mice. Hum Exp Toxicol 2016; 25:79-84. [PMID: 16539212 DOI: 10.1191/0960327106ht589oa] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The genotoxic potential of anti-tumor drugs limits their efficacy in the treatment of cancers. Since ancient times, saffron (dried stigmas of Crocus sativus L.) has been used as a spice and medicinal herb. Saffron is a rich source of carotenoids and is known for its anti-cancer and antitumor properties. The present study was designed to ascertain the chemoprotective potential of saffron against the genotoxicity of three well-known anti-tumor drugs-cisplatin (CIS), cyclophosphamide (CPH) and mitomycin C (MMC)-using comet assay. Three doses of saffron (20, 40 and 80 mg/kg b.w.) were orally administered to mice for five consecutive days prior to the administration of anti-tumor drugs under investigation. Pre-treatment with saffron significantly inhibited anti-tumor drugs induced cellular DNA damage (strand breaks) as revealed by decreased comet tail length, tail moment and percent DNA in the tail. These findings, together with our previous results, suggest a potential role for saffron as an anti-genotoxic, anti-oxidant and chemopreventive agent and could be used as an adjuvant in chemotherapeutic applications.
Collapse
Affiliation(s)
- K Premkumar
- Department of Genetics, Dr. ALM Post Graduate Institute of Basic Medical Sciences, University of Madras, Taramani, Chennai 600-113, India.
| | | | | | | | | |
Collapse
|
7
|
Luo T, Yang L, Wu J, Zheng Z, Li G, Wang X, Kaplan DL. Stabilization of Natural Antioxidants by Silk Biomaterials. ACS APPLIED MATERIALS & INTERFACES 2016; 8:13573-13582. [PMID: 27139741 DOI: 10.1021/acsami.6b01636] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The stabilities of three natural antioxidants, vitamin C (VC), (-)-epigallocatechin gallate (EGCG), and curcumin, in silk films were examined and mechanisms of stabilization were elucidated. The antioxidants were physically incorporated into three types of silk films: as-cast, dried from hydrogels, and methanol-treated. Films were stored at 4, 37, and 45 °C for 30 days in phosphate-buffered saline, pH 7.4, along with controls consisting of free antioxidants. Incorporation of antioxidants did not significantly change film morphology or secondary structure. When stored at 4 °C, all samples showed similar antioxidant activities (percent scavenging) at different time points, determined by the colorimetric 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. At higher temperatures, VC in the as-cast film, EGCG in the as-cast and dried hydrogel films, and curcumin in the methanol-treated films retained more than 50% scavenging activity after 14 days of storage, significantly higher than the other samples. Interaction between antioxidants and silk, as well as degradation of the antioxidants, was investigated by fast-performance liquid chromatography (FPLC) and high-pressure liquid chromatography (HPLC), with an aim of understanding the mechanisms of silk-based stabilization. Binding of antioxidant molecules to hydrophobic or to hydrophilic/hydrophilic boundary regions of silk, depending on the chemical properties of the antioxidant, may account for the observed stabilization effects. The data can help guide further engineering of antioxidant-functionalized silk biomaterials.
Collapse
Affiliation(s)
- Tingting Luo
- National Engineering Laboratory for Modern Silk, Soochow University , Suzhou 215123, China
| | - Lei Yang
- National Engineering Laboratory for Modern Silk, Soochow University , Suzhou 215123, China
| | - Jianbing Wu
- National Engineering Laboratory for Modern Silk, Soochow University , Suzhou 215123, China
| | - Zhaozhu Zheng
- National Engineering Laboratory for Modern Silk, Soochow University , Suzhou 215123, China
| | - Gang Li
- National Engineering Laboratory for Modern Silk, Soochow University , Suzhou 215123, China
| | - Xiaoqin Wang
- National Engineering Laboratory for Modern Silk, Soochow University , Suzhou 215123, China
| | - David L Kaplan
- Department of Biomedical Engineering, Tufts University , Medford, Massachusetts 02155, United States
| |
Collapse
|
8
|
Girma B, Yimer G, Makonnen E. Effect of Rumex Abyssinicus on preneoplastic lesions in dimethylhydrazine induced colon carcinogenesis in rats. BMC COMPLEMENTARY AND ALTERNATIVE MEDICINE 2015; 15:365. [PMID: 26470793 PMCID: PMC4608320 DOI: 10.1186/s12906-015-0883-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Accepted: 09/28/2015] [Indexed: 12/28/2022]
Abstract
BACKGROUND Cancer as a multistage process can be reversed or blocked by using chemopreventive agents. Colon cancer chemoprevention has been widely investigated using cyclooxygenase inhibitors and many other chemicals of synthetic or natural origin. This particular study was carried out to assess the colon cancer chemopreventive effect of hydro-methanol extract of Rumex abyssinicus rhizome on rats. METHOD Colon cancer chemopreventive potential of hydro-methanol extract of Rumex abyssinicus rhizome was determined based on the number and multiplicity of aberrant crypt foci (ACF). Fifteen DMH (1, 2-dimethylhydrazine) treated and five untreated Wistar female rats were used. DMH was administered subcutaneously 30 mg/kg, after its pH was adjusted to 6.5-7. Treatment groups started receiving extract after six weeks of weekly DMH injections. The rats were divided in to four groups: Group 1 received only oral normal saline, Group 2 received DMH and normal saline, Group 3 and 4 received DMH plus 250 mg/kg and 500 mg/kg extract, respectively. Specific phytoconstituents of the plant, which were reviewed from original articles, were virtually evaluated for cyclooxygenase-2 (COX-2) inhibition. The binding energies and interactions of the phytochemicals from Rumex abyssinicus against COX-2 were determined by Autodock4.2. RESULTS There was a statistically significant reduction (p-value < 0.05) in the number of aberrant crypt (AC) and aberrant crypt foci (ACF) at both administered doses. However, significant association (p-value > 0.05) was not observed in reducing crypt multiplicity. The docking process resulted in estimated binding energies [-6.83 kcal/mol to -7.9 kcal/mol] which are closer to the positive controls or Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) [-4.55 kcal/mol to -10.84 kcal/mol]. The phytochemical-COX-2 interaction indicated the involvement of key amino acid residues in inhibition of cyclooxygenase like ARG120, TYR355, TYR385, SER530 and GLY526. CONCLUSIONS Rumex abyssinicus had demonstrated a chemopreventive potential at post-initiation stage. As the virtual screening data suggested, COX-2 inhibition by the anthraquinones in the extract could be one mechanism for the observed chemopreventive effect.
Collapse
Affiliation(s)
- Biniyam Girma
- Pharmacology and Toxicology Course Team, School of Pharmacy, College of Health Sciences, Jimma University, Jimma, Ethiopia.
| | - Getnet Yimer
- Department of Pharmacology, School of Medicine, College of Health Sciences, Addis Ababa University, Addis Ababa, Ethiopia.
| | - Eyasu Makonnen
- Department of Pharmacology, School of Medicine, College of Health Sciences, Addis Ababa University, Addis Ababa, Ethiopia.
| |
Collapse
|
9
|
Abstract
Cancer chemoprevention refers to the use of agents for the inhibition, delay, or reversal of carcinogenesis before invasion. In the present review, agents examined in the context of cancer chemoprevention are classified in four major categories—hormonal, medications, diet-related agents, and vaccines—and the main representatives of each category are presented. Although there are serious constraints in the documentation of effectiveness of chemopreventive agents, mainly stemming from the long latency of the condition they are addressing and the frequent lack of intermediate biomarkers, there is little disagreement about the role of aspirin, whereas a diet rich in vegetables and fruits appears to convey more protection than individual micronutrients. Among categories of cancer chemopreventive agents, hormonal ones and vaccines might hold more promise for the future. Also, the identification of individuals who would benefit most from chemopreventive interventions on the basis of their genetic profiles could open new prospects for cancer chemoprevention.
Collapse
Affiliation(s)
- Vassiliki Benetou
- Department of Hygiene, Epidemiology and Medical Statistics, University of Athens Medical School, Athens, GR-115 27, Greece
| | - Areti Lagiou
- Department of Public Health and Community Health, Faculty of Health Professions, Athens Technological Educational Institute (TEI Athens), Athens, Greece
| | - Pagona Lagiou
- Department of Hygiene, Epidemiology and Medical Statistics, University of Athens Medical School, Athens, GR-115 27, Greece; Department of Epidemiology, Harvard School of Public Health, Boston, MA, USA
| |
Collapse
|
10
|
Mahgoub HAM, Eisa GSA, Youssef MAH. Molecular, biochemical and anatomical analysis of some potato ( Solanum tuberosum L.) cultivars growing in Egypt. J Genet Eng Biotechnol 2014; 13:39-49. [PMID: 30647565 PMCID: PMC6299736 DOI: 10.1016/j.jgeb.2014.11.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Revised: 10/20/2014] [Accepted: 11/23/2014] [Indexed: 11/30/2022]
Abstract
Potato (Solanum tuberosum L.) is widely used for many industrial and food applications. Nine potato cultivars were planted and collected from a private farm in new Salihiyyah city, Sharkia governorate, Egypt to compare between them at morphological, molecular, biochemical and anatomical levels. Our results indicated that the Inova cultivar was better, however the Bafana cultivar was worse in relation to yield parameters. Inter simple sequence repeat (ISSR) molecular marker has been used to determine the genetic diversity between these nine cultivars. Through using ten primers we obtained 98 bands, 85 of which were polymorphic by 87%. The highest similarity value (0.827) was found between Caruso and Alliance as the closest but the lowest value (0.418) was found between Charlotte and Bafana as the most distant. Everest tuber contained great amounts of total phenolic and peroxidase activity, while the Bafana tuber contained small amounts of it compared to other cultivars. The phellem layer of the Everest tuber had more thickness than others and the number of phellem rows was the highest. However, the Bafana cultivar listed the lowest value compared to other cultivars. Lower values from both of total bacterial and total fungi were recorded on the tuber of the Everest cultivar. However, Bafana cultivar was recorded to have a higher value of both compared to other cultivars. We suggest that the ISSR marker is a suitable procedure to examine the potato’s genetic diversity at the DNA level. The Everest cultivar is considering the best cultivar to planting and breeding in Egypt.
Collapse
Affiliation(s)
- H A M Mahgoub
- Botany and Microbiology Department, Faculty of Science, Al-Azhar University, Cairo, Egypt
| | - G S A Eisa
- Agriculture Botany Department, Faculty of Agriculture, Zagazig University, Zagazig, Egypt
| | - M A H Youssef
- Genetics Department, Faculty of Agriculture, Zagazig University, Zagazig, Egypt
| |
Collapse
|
11
|
Kim JY, Alam F, Chung SW, Park J, Jeon OC, Kim SY, Son WC, Byun Y. Combinational chemoprevention effect of celecoxib and an oral antiangiogenic LHD4 on colorectal carcinogenesis in mice. Anticancer Drugs 2014; 25:1061-71. [DOI: 10.1097/cad.0000000000000141] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
12
|
Vitale N, Kisslinger A, Paladino S, Procaccini C, Matarese G, Pierantoni GM, Mancini FP, Tramontano D. Resveratrol couples apoptosis with autophagy in UVB-irradiated HaCaT cells. PLoS One 2013; 8:e80728. [PMID: 24260465 PMCID: PMC3834311 DOI: 10.1371/journal.pone.0080728] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Accepted: 10/07/2013] [Indexed: 12/17/2022] Open
Abstract
UVB radiation causes about 90% of non-melanoma skin cancers by damaging DNA either directly or indirectly by increasing levels of reactive oxygen species (ROS). Skin, chronically exposed to both endogenous and environmental pro-oxidant agents, contains a well-organised system of chemical and enzymatic antioxidants. However, increased or prolonged free radical action can overwhelm ROS defence mechanisms, contributing to the development of cutaneous diseases. Thus, new strategies for skin protection comprise the use of food antioxidants to counteract oxidative stress. Resveratrol, a phytoalexin from grape, has gained a great interest for its ability to influence several biological mechanisms like redox balance, cell proliferation, signal transduction pathways, immune and inflammatory response. Therefore, the potential of resveratrol to modify skin cell response to UVB exposure could turn out to be a useful option to protect skin from sunlight-induced degenerative diseases. To investigate into this matter, HaCaT cells, a largely used model for human skin keratinocytes, were treated with 25 or 100 µM resveratrol for 2 and 24 hours prior to UVB irradiation (10 to 100 mJ/cm2). Cell viability and molecular markers of proliferation, oxidative stress, apoptosis, and autophagy were analyzed. In HaCaT cells resveratrol pretreatment: reduces UVB-induced ROS formation, enhances the detrimental effect of UVB on HaCaT cell vitality, increases UVB-induced caspase 8, PARP cleavage, and induces autophagy. These findings suggest that resveratrol could exert photochemopreventive effects by enhancing UVB-induced apoptosis and by inducing autophagy, thus reducing the odds that damaged cells could escape programmed cell death and initiate malignant transformation.
Collapse
Affiliation(s)
- Nicoletta Vitale
- Department of Molecular Medicine and Medical Biotechnologies, University of Naples “Federico II”, Naples, Italy
| | | | - Simona Paladino
- Department of Molecular Medicine and Medical Biotechnologies, University of Naples “Federico II”, Naples, Italy
| | - Claudio Procaccini
- Institute of Oncology and Experimental Endocrinology, CNR, Naples, Italy
| | - Giuseppe Matarese
- Department of Medicine and Surgery, University of Salerno, Baronissi Campus, Salerno, Italy
- IRCCS MultiMedica, Milan, Italy
| | - Giovanna Maria Pierantoni
- Department of Molecular Medicine and Medical Biotechnologies, University of Naples “Federico II”, Naples, Italy
| | | | - Donatella Tramontano
- Department of Molecular Medicine and Medical Biotechnologies, University of Naples “Federico II”, Naples, Italy
- * E-mail:
| |
Collapse
|
13
|
Carvajal M. Transformación de la aflatoxina B1 de alimentos, en el cancerígeno humano, aducto AFB1-ADN. TIP REVISTA ESPECIALIZADA EN CIENCIAS QUÍMICO-BIOLÓGICAS 2013. [DOI: 10.1016/s1405-888x(13)72082-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
|
14
|
Zhou SK, Zhang RL, Xu YF, Bi TN. Antioxidant and immunity activities of Fufang Kushen Injection Liquid. Molecules 2012; 17:6481-90. [PMID: 22728348 PMCID: PMC6268272 DOI: 10.3390/molecules17066481] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2012] [Revised: 05/22/2012] [Accepted: 05/23/2012] [Indexed: 01/20/2023] Open
Abstract
We investigated the effects of Fufang Kushen Injection Liquid (FFKSIL) on gastric immunity and oxidant-antioxidant status during N-methyl-N′-nitro-N-nitroso-guanidine (MNNG)-induced gastric carcinogenesis. The extent of lipid peroxidation and the levels of reduced glutathione (GSH) and activities of the GSH-dependent enzymes superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GSH-Px) were used to monitor the peroxidative balance. Enhanced lipid peroxidation in the gastric cancer animals was accompanied by significant decreases in the activities of GSH, GPx, GST and GR. Administration of FFKSIL significantly enhanced serum IgA, IgG, IgM, IL-2, IL-4 and IL-10 levels, decreased serum IL-6 and TNF-α levels, lowered the levels of lipid peroxides and enhanced GSH levels and activities of GSH-dependent enzymes. Our results suggest that FFKSIL blocks experimental gastric carcinogenesis by protecting against carcinogen-induced oxidative damage and improving immunity activity.
Collapse
Affiliation(s)
| | | | | | - Tie-Nan Bi
- Author to whom correspondence should be addressed; E-Mail: ; Tel./Fax: +86-0576-8512-0120
| |
Collapse
|
15
|
Luo C, Wu XG. Lycopene enhances antioxidant enzyme activities and immunity function in N-methyl-N'-nitro-N-nitrosoguanidine-enduced gastric cancer rats. Int J Mol Sci 2011; 12:3340-51. [PMID: 21686188 PMCID: PMC3116194 DOI: 10.3390/ijms12053340] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2011] [Revised: 04/27/2011] [Accepted: 05/17/2011] [Indexed: 01/17/2023] Open
Abstract
To investigate anticancer effect of lycopene, we examined the effects of lycopene on the oxidative injury and immunity activities of N-methyl-N'-nitro-N-nitrosoguanidine (MNNG)-induced gastric cancer rats. The animals were divided into five groups. Group I served as the normal control and was given corn oil orally for 20 weeks. Group II were induced with MNNG 200 mg/kg body weight by oral gavage at days 0 and 14, and saturated NaCl (1 mL per rats) was given once every three days for four weeks until the end of the experimental period. Group III, IV and V were posttreated with lycopene (50, 100 and 150 mg/kg body weight, dissolved in corn oil) from the sixth week of MNNG (as in group II) induction up to the end of the experimental period. In the presence of MNNG, MDA and immunity levels were significantly increased, whereas enzymatic (SOD, CAT, and GPx) antioxidant activities were decreased in the treated rats compared with normal control rats. Administration of lycopene to gastric carcinoma-induced rats largely up-regulated the redox status and immunity activities to decrease the risk of cancer compared to group II. We conclude that up-regulation of antioxidants and immunity by lycopene treatment might be responsible for the anticancer effect in gastric carcinoma.
Collapse
Affiliation(s)
- Cong Luo
- Chemotherapy Department, Zhejiang Cancer Hospital, Hangzhou City, Zhejiang, 310022, China; E-Mail:
| | - Xian-Guo Wu
- Department of Clinical Laboratory, Second Affiliated Hospital, Zhejiang University School of Medicine, 88 Jiefang Road, Hangzhou City, Zhejiang, 310009, China
| |
Collapse
|
16
|
Lin CC, Lin HY, Chen HC, Yu MW, Lee MH. Stability and characterisation of phospholipid-based curcumin-encapsulated microemulsions. Food Chem 2009. [DOI: 10.1016/j.foodchem.2009.03.052] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
17
|
Sukkar SG. What about “5-a-day” dietary education programme 20 years later? The five colours of cancer and obesity prevention. MEDITERRANEAN JOURNAL OF NUTRITION AND METABOLISM 2009. [DOI: 10.1007/s12349-009-0062-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
18
|
Youl PH, Janda M, Kimlin M. Vitamin D and sun protection: The impact of mixed public health messages in Australia. Int J Cancer 2009; 124:1963-70. [DOI: 10.1002/ijc.24154] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
|
19
|
Davidson PG, Touger-Decker R. Chemopreventive Role of Fruits and Vegetables in Oropharyngeal Cancer. Nutr Clin Pract 2009; 24:250-60. [DOI: 10.1177/0884533609332088] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
| | - Riva Touger-Decker
- From the University of Medicine and Dentistry of New Jersey, Morris Plains
| |
Collapse
|
20
|
Ekambaram G, Rajendran P, Magesh V, Sakthisekaran D. Naringenin reduces tumor size and weight lost in N-methyl-N'-nitro-N-nitrosoguanidine-induced gastric carcinogenesis in rats. Nutr Res 2009; 28:106-12. [PMID: 19083396 DOI: 10.1016/j.nutres.2007.12.002] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2007] [Revised: 12/01/2007] [Accepted: 12/04/2007] [Indexed: 02/08/2023]
Abstract
Carcinoma of the stomach is reportedly the second most common cancerous condition affecting the general population. Administration of antioxidants is reported to effectively alleviate the risk of gastric carcinoma. Therefore, we assessed the protective role of naringenin, an antioxidant and naturally occurring citrus flavanone, on gastric carcinogenesis induced by MNNG (200 mg/kg body weight) and S-NaCl (1 mL per rat) in Wistar rats (obtained from the Central Animal House Facility, University of Madras, Taramani Campus, Chennai, India). The animals were divided into 5 groups, and the effects of naringenin on simultaneous and posttreated stages of MNNG were tested. Cancer risk was analyzed along with their antioxidant status. The LPO levels in the experimental groups were assessed as an index of oxidative milieu. Altered redox status was subsequently investigated by assaying the superoxide and hydroxyl radicals, the enzymatic antioxidants (SOD, CAT, GPx), and the nonenzymatic antioxidants viz reduced GSH, vitamin C, and vitamin E. In the presence of MNNG, cancer incidence and LPO levels were significantly increased, whereas enzymatic (SOD, CAT, and GPx) and nonenzymatic antioxidant activities (GSH, Vitamins C, and E) were decreased in the treated rats compared with control rats. Administration of naringenin to gastric carcinoma-induced rats largely up-regulated the redox status to decrease the risk of cancer. We conclude that up-regulation of antioxidants by naringenin treatment might be responsible for the anticancer effect in gastric carcinoma.
Collapse
Affiliation(s)
- Ganapathy Ekambaram
- Department of Medical Biochemistry, Dr A.L. Mudaliyar Postgraduate Institute of Basic Medical Sciences, University of Madras, Taramani Campus, Chennai 600 113, India
| | | | | | | |
Collapse
|
21
|
Serpeloni JM, Bisarro dos Reis M, Rodrigues J, Campaner dos Santos L, Vilegas W, Varanda EA, Dokkedal AL, Cólus IMS. In vivo assessment of DNA damage and protective effects of extracts from Miconia species using the comet assay and micronucleus test. Mutagenesis 2008; 23:501-7. [PMID: 18765422 DOI: 10.1093/mutage/gen043] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The genus Miconia comprises approximately 1000 species belonging to the Melastomataceae family. Several crude plant extracts from Miconia and their isolated compounds have shown biological activities, such as analgesic and anti-neoplastic action; however, no studies concerning their effects on DNA are available. The present study aimed to evaluate, in vivo, the genotoxic and mutagenic effects of four species of plants from Miconia genus using the comet assay and micronucleus test. Their possible protective effects were also evaluated in experiments associating the plant extracts with cyclophosphamide (CPA). The methanolic extracts of Miconia albicans, Miconia cabucu, Miconia rubiginosa, Miconia stenostachya and the chloroformic extract of M. albicans were investigated. For genotoxic and mutagenic evaluations, three concentrations were tested, 200, 400 and 540 mg/kg body weight (bw), based on the solubility limit of the extract in distilled water. For the protective effects, only the highest dose was evaluated against 40 mg/kg bw of CPA. Blood was removed from mice tails pre- (T0) and post-treatment (T1-30 h) for the micronucleus test and 24 h post-treatment for the comet assay. The Student's t-test was used to compare data obtained at T0 and T1, the analysis of variance-Tukey test was used to compare between groups in the micronucleus test and the Kruskal-Wallis and Dunn's test were used to compare different groups in the comet assay. All the extracts induced alterations in DNA migration (comet assay); however, no mutagenic effect was observed in the micronucleus assay. All extracts showed a protective effect against CPA in both assays. Our study showed that the use of crude extracts could be more advantageous than the use of isolated compounds. The interaction between phytochemicals in the extracts showed efficacy in reducing mutagenicity and improving the protective effects.
Collapse
Affiliation(s)
- Juliana Mara Serpeloni
- Department of General Biology, Biological Sciences Center, Londrina State University, Londrina, Parana, Brazil.
| | | | | | | | | | | | | | | |
Collapse
|
22
|
Bjelakovic G, Nikolova D, Simonetti RG, Gluud C. Antioxidant supplements for preventing gastrointestinal cancers. Cochrane Database Syst Rev 2008:CD004183. [PMID: 18677777 DOI: 10.1002/14651858.cd004183.pub3] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Oxidative stress may cause gastrointestinal cancers. The evidence on whether antioxidant supplements are effective in preventing gastrointestinal cancers is contradictory. OBJECTIVES To assess the beneficial and harmful effects of antioxidant supplements in preventing gastrointestinal cancers. SEARCH STRATEGY We identified trials through the trials registers of the four Cochrane Review Groups on gastrointestinal diseases, The Cochrane Central Register of Controlled Trials in The Cochrane Library (Issue 2, 2007), MEDLINE, EMBASE, LILACS, SCI-EXPANDED, and The Chinese Biomedical Database from inception to October 2007. We scanned reference lists and contacted pharmaceutical companies. SELECTION CRITERIA Randomised trials comparing antioxidant supplements to placebo/no intervention examining occurrence of gastrointestinal cancers. DATA COLLECTION AND ANALYSIS Two authors (GB and DN) independently selected trials for inclusion and extracted data. Outcome measures were gastrointestinal cancers, overall mortality, and adverse effects. Outcomes were reported as relative risks (RR) with 95% confidence interval (CI) based on random-effects and fixed-effect model meta-analysis. Meta-regression assessed the effect of covariates across the trials. MAIN RESULTS We identified 20 randomised trials (211,818 participants), assessing beta-carotene (12 trials), vitamin A (4 trials), vitamin C (8 trials), vitamin E (10 trials), and selenium (9 trials). Trials quality was generally high. Heterogeneity was low to moderate. Antioxidant supplements were without significant effects on gastrointestinal cancers (RR 0.94, 95% CI 0.83 to 1.06). However, there was significant heterogeneity (I(2) = 54.0%, P = 0.003). The heterogeneity may have been explained by bias risk (low-bias risk trials RR 1.04, 95% CI 0.96 to 1.13 compared to high-bias risk trials RR 0.59, 95% CI 0.43 to 0.80; test of interaction P < 0.0005), and type of antioxidant supplement (beta-carotene potentially increasing and selenium potentially decreasing cancer risk). The antioxidant supplements had no significant effects on mortality in a random-effects model meta-analysis (RR 1.02, 95% CI 0.97 to 1.07, I(2) = 53.5%), but significantly increased mortality in a fixed-effect model meta-analysis (RR 1.04, 95% CI 1.02 to 1.07). Beta-carotene in combination with vitamin A (RR 1.16, 95% CI 1.09 to 1.23) and vitamin E (RR 1.06, 95% CI 1.02 to 1.11) significantly increased mortality. Increased yellowing of the skin and belching were non-serious adverse effects of beta-carotene. In five trials (four with high risk of bias), selenium seemed to show significant beneficial effect on gastrointestinal cancer occurrence (RR 0.59, 95% CI 0.46 to 0.75, I(2) = 0%). AUTHORS' CONCLUSIONS We could not find convincing evidence that antioxidant supplements prevent gastrointestinal cancers. On the contrary, antioxidant supplements seem to increase overall mortality. The potential cancer preventive effect of selenium should be tested in adequately conducted randomised trials.
Collapse
Affiliation(s)
- Goran Bjelakovic
- Copenhagen Trial Unit, Centre for Clinical Intervention Research,, Department 3344, Rigshospitalet, Copenhagen University Hospital,, Blegdamsvej 9, Copenhagen, Denmark, DK-2100.
| | | | | | | |
Collapse
|
23
|
Hemmati AA, Nazari Z, Samei M. A comparative study of grape seed extract and vitamin E effects on silica-induced pulmonary fibrosis in rats. Pulm Pharmacol Ther 2008; 21:668-74. [PMID: 18547852 DOI: 10.1016/j.pupt.2008.04.004] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2007] [Revised: 04/13/2008] [Accepted: 04/16/2008] [Indexed: 12/17/2022]
Abstract
Due to the production of reactive oxygen species (ROS), oxidative stress has been implicated in the pathogenesis of silica-induced lung fibrosis. So it is hypothesized that grape seed extract (GSE) or vitamin E (Vit E) as antioxidants may ameliorate some symptoms of the disease. Male Wistar albino rats were divided into 7 groups: rats in group I instilled intratracheally (IT) with a single dose of silica suspension (50mg/rat) as positive control (PC). Treatment groups (II-IV) received Vit E (20 IU/kg/day), GSE (150 mg/kg/day), or Vit E+GSE simultaneously orally 1 day after instillation of silica. Groups V and VI were given oral GSE or Vit E after instillation of the equivalent volume of saline (IT) as controls for GSE or Vit E. Rats of group VII only instilled saline (IT) as negative control. After 90 days animals were sacrificed and plasma-malondialdehyde (p-MDA) and lung tissue hydroxyproline (HP) were quantified. The lungs were also investigated for histopathological changes. The mean concentrations of p-MDA and HP in studied groups (I-VII) were 1.95, 2.77, 0.72, 0.81, 0.64, 0.94, 1.02 micromolMDA/L(plasma) and 28.476, 27.85, 22.83, 22.64, 15.40, 18.31, 18.51 mgHP/g(tissue), respectively. Silica caused a significant increase in HP content of lungs and MDA levels in the plasma except in GSE-treated groups (III and IV). According to the results of this study GSE could reduce the fibrogenic effect of silica. However; no synergistic effect was observed after co-administration of GSE and Vit E.
Collapse
Affiliation(s)
- Ali A Hemmati
- Department of Pharmacology and Toxicology, School of Pharmacy, Physiology Research Center, Ahwaz Jundishapur University of Medical Sciences, Ahwaz 61357, Iran.
| | | | | |
Collapse
|
24
|
Reagan-Shaw S, Mukhtar H, Ahmad N. Resveratrol imparts photoprotection of normal cells and enhances the efficacy of radiation therapy in cancer cells. Photochem Photobiol 2008; 84:415-21. [PMID: 18221451 DOI: 10.1111/j.1751-1097.2007.00279.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Solar radiation spans a whole range of electromagnetic spectrum including UV radiation, which are potentially harmful to normal cells as well as ionizing radiations which are therapeutically beneficial towards the killing of cancer cells. UV radiation is an established cause of a majority of skin cancers as well as precancerous conditions such as actinic keratosis. However, despite efforts to educate people about the use of sunscreens and protective clothing as preventive strategies, the incidence of skin cancer and other skin-related disorders are on the rise. This has generated an enormous interest towards finding alternative approaches for management of UV-mediated damages. Chemoprevention via nontoxic agents, especially botanical antioxidants, is one such approach that is being considered as a plausible strategy for prevention of photodamages including photocarcinogenesis. In this review, we have discussed the photoprotective effects of resveratrol, an antioxidant found in grapes and red wine, against UVB exposure-mediated damages in vitro and in vivo. In addition, we have also discussed studies showing that resveratrol can act as a sensitizer to enhance the therapeutic effects of ionizing radiation against cancer cells. Based on available literature, we suggest that resveratrol may be useful for (1) prevention of UVB-mediated damages including skin cancer and (2) enhancing the response of radiation therapies against hyperproliferative, precancerous and neoplastic conditions.
Collapse
|
25
|
Andre CM, Ghislain M, Bertin P, Oufir M, Herrera MDR, Hoffmann L, Hausman JF, Larondelle Y, Evers D. Andean potato cultivars (Solanum tuberosum L.) as a source of antioxidant and mineral micronutrients. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2007; 55:366-78. [PMID: 17227067 DOI: 10.1021/jf062740i] [Citation(s) in RCA: 118] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Potato tubers were evaluated as a source of antioxidants and minerals for the human diet. A genetically diverse sample of Solanum tuberosum L. cultivars native to the Andes of South America was obtained from a collection of nearly 1000 genotypes using microsatellite markers. This size-manageable collection of 74 landraces, representing at best the genetic diversity among potato germplasm, was analyzed for iron, zinc, calcium, total phenolic, total carotenoid, and total vitamin C contents. The hydrophilic antioxidant capacity of each genotype was also measured using the oxygen radical absorbance capacity (ORAC) assay. The iron content ranged from 29.87 to 157.96 microg g-1 of dry weight (DW), the zinc content from 12.6 to 28.83 microg g-1 of DW, and the calcium content from 271.09 to 1092.93 microg g-1 of DW. Total phenolic content varied between 1.12 and 12.37 mg of gallic acid equiv g-1 of DW, total carotenoid content between 2.83 and 36.21 microg g-1 of DW, and total vitamin C content between 217.70 and 689.47 microg g-1 of DW. The range of hydrophilic ORAC values was 28.25-250.67 micromol of Trolox equiv g-1 of DW. The hydrophilic antioxidant capacity and the total phenolic content were highly and positively correlated (r = 0.91). A strong relationship between iron and calcium contents was also found (r = 0.67). Principal component analysis on the studied nutritional contents of the core collection revealed that most potato genotypes were balanced in terms of antioxidant and mineral contents, but some of them could be distinguished by their high level in distinct micronutrients. Correlations between the micronutrient contents observed in the sample and the genetic distances assessed by microsatellites were weakly significant. However, this study demonstrated the wide variability of health-promoting micronutrient levels within the native potato germplasm as well as the significant contribution that distinct potato tubers may impart to the intake in dietary antioxidants, zinc, and iron.
Collapse
Affiliation(s)
- Christelle M Andre
- Institut des Sciences de la Vie, Université catholique de Louvain, B-1348 Louvain-La-Neuve, Belgium.
| | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Li BH, Ma XF, Wu XD, Tian WX. Inhibitory activity of chlorogenic acid on enzymes involved in the fatty acid synthesis in animals and bacteria. IUBMB Life 2006; 58:39-46. [PMID: 16540431 DOI: 10.1080/15216540500507408] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
It was found that chlorogenic acid inhibited in vitro animal fatty acid synthase (FAS I) and the ss-ketoacyl-ACP reductase (FabG) from Escherichia coli in a concentration-dependent manner with respective IC50 of 94.8 and 88.1 microM. The results of Lineweaver-Burk plots indicated that chlorogenic acid inhibited competitively the binding of NADPH to FAS I, while left those of acetyl-CoA and malonyl-CoA unaffected. Further kinetic studies showed that chlorogenic acid blocked the activity of FAS I mainly by inhibiting the ss-ketoacyl reductase domain, which catalyzed the same reaction as that done by FabG in the fatty acid synthesis. The ss-ketoacyl reduction reactions accomplished by both FAS I and FabG required nucleotide cofactor, NADPH. Furthermore, the Lineweaver-Burk and Yonetani-Theorell analyses implicated that chlorogenic acid filled competitively in the binding-pocket of NADPH in the ss-ketoacyl reductase domain of FAS I. The similar results were also obtained from the inhibition of FabG by chlorogenic acid. As observed in these results, the inhibitions of FAS I and FabG by chlorogenic acid were highly related to the interference of the inhibitor with NADPH, which was possibly due to the similarity between chlorogenic acid and some portion of NADPH, maybe the section consisting of the two ribose groups.
Collapse
Affiliation(s)
- Bing-Hui Li
- Department of Biology, Graduate University of Chinese Academy of Sciences, Beijing, PR China
| | | | | | | |
Collapse
|
27
|
Velayutham M, Villamena FA, Navamal M, Fishbein JC, Zweier JL. Glutathione-mediated formation of oxygen free radicals by the major metabolite of oltipraz. Chem Res Toxicol 2005; 18:970-5. [PMID: 15962931 DOI: 10.1021/tx049687h] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The major metabolite of the cancer chemopreventive oltipraz (1), a pyrrolopyrazine thione, 4, has been shown to be a phase two enzyme inducer, an activity thought to be a key to the cancer chemopreventive action of the parent compound. To understand the possible mechanism by which the metabolite acts as an inducer, a study of its potential to generate free radicals was undertaken. Electron paramagnetic resonance (EPR) spin trapping studies using 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) were performed with 7-methyl-6,8-bis-methyldisulfanyl-pyrrolo[1,2-a]pyrazine, 5, a synthetic precursor to the metabolite in aqueous and organic solvents. In the presence of GSH, which rapidly liberates the metabolite from the precursor, a 1:2:2:1 quartet spectrum with hyperfine coupling constants a(N) = a(H) = 14.9 G, characteristic of the hydroxyl radical adduct of DMPO, was observed in the presence of oxygen. No signal was seen under anaerobic conditions. This signal was quenched by the addition of the superoxide scavenging enzyme Cu,Zn-superoxide dismutase. In aqueous dimethyl sulfoxide (80 vol % DMSO), the metabolite precursor 5, GSH, and DMPO exhibited an EPR spectrum with the hyperfine values of a(N) = 12.7 G, a(H1) = 10.3 G, and a(H2) = 1.3 G, corresponding to the superoxide radical adduct of DMPO. The amount of superoxide radical adduct formed from the reaction of 5 and GSH increases with GSH concentration in phosphate buffer solution. Kinetic studies show that the formation of superoxide radical anion is first-order with respect to GSH. The formation of superoxide radical anion by the metabolite in the presence of GSH is linear at lower concentrations of 5 but becomes nonlinear at high concentrations. Overall, these studies suggest a mechanism in which GSH reduces the metabolite 4 to 4. , presumably a radical anion, that in turn donates an electron to oxygen resulting in superoxide radical anion formation. This GSH stimulated redox cycle of the metabolite 4 suggests a possible mechanism by which the parent compound oltipraz might effect the cancer chemopreventive increase in the transcription of phase two enzymes that is mediated by transcription factor Nrf2.
Collapse
Affiliation(s)
- Murugesan Velayutham
- Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute,, The Department of Internal Medicine, The Ohio State University College of Medicine, Columbus, OH 43210, USA
| | | | | | | | | |
Collapse
|
28
|
Abstract
Ovulation is a rate-limiting event for the perpetuation of a species; unfortunately, it imparts a cancer risk. Reactive oxidants generated during the mechanics of ovulatory follicular rupture damage the DNA of ovarian surface epithelial cells that are located within a limited diffusion radius. Those cells that survive the trauma of ovulation, along the margins of a ruptured follicle, proliferate and migrate to reconcile the discontinuity within the ovarian epithelium created at the site of oocyte release. It is conceivable that clonal expansion of an ovarian surface epithelial cell with unrepaired DNA, but not committed to death, could be an initiating factor in the etiology of common ovarian cancer. In fact, the majority of cancers of the ovary are derived from the surface epithelium; and circumstances that avert ovulation (oral contraceptive use, pregnancy/lactation) protect against ovarian adenocarcinoma. Not surprisingly, the genotoxic potential of ovulation is exacerbated by malfunctions in tumor suppressor/cell-cycle arrest and base-excision repair mechanisms. Recent experimental evidence indicates that vitamin E and progesterone protect against ovarian metaplasia by negating the oxidative stress of ovulation and by enhancing the repair capacity (genomic integrity) of the surface epithelium, respectively. Ovarian cancer of surface epithelial origin is a deadly insidious disease because it characteristically remains asymptomatic until it has metastasized throughout the abdominal cavity; therefore, prevention is a high priority.
Collapse
Affiliation(s)
- William J Murdoch
- Department of Animal Science and Reproductive Biology Program, University of Wyoming, Laramie, 82071, USA.
| |
Collapse
|
29
|
Feng R, Lu Y, Bowman LL, Qian Y, Castranova V, Ding M. Inhibition of activator protein-1, NF-kappaB, and MAPKs and induction of phase 2 detoxifying enzyme activity by chlorogenic acid. J Biol Chem 2005; 280:27888-95. [PMID: 15944151 DOI: 10.1074/jbc.m503347200] [Citation(s) in RCA: 268] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Chlorogenic acid, the ester of caffeic acid with quinic acid, is one of the most abundant polyphenols in the human diet. The antioxidant and anticarcinogenic properties of chlorogenic acid have been established in animal studies. However, little is known about the molecular mechanisms through which chlorogenic acid inhibits carcinogenesis. In this study, we found that chlorogenic acid inhibited the proliferation of A549 human cancer cells in vitro. The results of the soft agar assay indicated that chlorogenic acid suppressed 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced neoplastic transformation of JB6 P+ cells in a dose-dependent manner. Pretreatment of JB6 cells with chlorogenic acid blocked UVB- or TPA-induced transactivation of AP-1 and NF-kappaB over the same dose range. At low concentrations, chlorogenic acid decreased the phosphorylation of c-Jun NH2-terminal kinases, p38 kinase, and MAPK kinase 4 induced by UVB/12-O-tetradecanoylphorbol-13-acetate, yet higher doses were required to inhibit extracellular signal-regulated kinases. Chlorogenic acid also increased the enzymatic activities of glutathione S-transferases (GST) and NAD(P)H: quinone oxidoreductase. Further studies indicated that chlorogenic acid could stimulate the nuclear translocation of Nrf2 (NF-E2-related factor) as well as subsequent induction of GSTA1 antioxidant response element (ARE)-mediated GST activity. The phosphatidylinositol 3-kinase pathway might be involved in the activation of Nrf2 translocation. These results provide the first evidence that chlorogenic acid could protect against environmental carcinogen-induced carcinogenesis and suggest that the chemopreventive effects of chlorogenic acid may be through its up-regulation of cellular antioxidant enzymes and suppression of ROS-mediated NF-kappaB, AP-1, and MAPK activation.
Collapse
Affiliation(s)
- Rentian Feng
- Pathology and Physiology Research Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia 26505, USA
| | | | | | | | | | | |
Collapse
|
30
|
Velmurugan B, Bhuvaneswari V, Abraham SK, Nagini S. Protective effect of tomato against N-methyl-N'-nitro-N-nitrosoguanidine-induced in vivo clastogenicity and oxidative stress. Nutrition 2005; 20:812-6. [PMID: 15325693 DOI: 10.1016/j.nut.2004.05.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
OBJECTIVE Chemoprevention by dietary constituents has emerged as a cost-effective approach to control the incidence of gastric cancer, the second most common malignancy worldwide, and a major cause of mortality in Chennai, India. Identification of dietary agents with chemopreventive potential requires prescreening in animal models. We evaluated the modifying effects of tomato paste against N-methyl-N'-nitro-N-nitrosoguanidine (MNNG)-induced genetic damage and oxidative stress in male Swiss mice. METHODS Quantitation of bone marrow micronuclei, extent of lipid peroxidation, and the status of the antioxidants reduced glutathione, glutathione peroxidase, and glutathione S-transferase in the stomach and liver of Swiss albino mice were used to monitor the protective effects of tomato. Three different doses of tomato (0.5, 1, and 2 g/kg of body weight) were administered intragastrically for 5 d consecutively followed by intragastric intubation of MNNG 1.5 h after the final administration. RESULTS Increased frequency of micronuclei and enhanced lipid peroxidation were accompanied by compromised antioxidant defenses in MNNG-treated rats. Pretreatment of tomato paste at the concentration of 1 and 2 g/kg of body weight significantly decreased micronuclei and lipid peroxidation and enhanced reduced glutathione-dependent antioxidant and detoxifying enzymes. CONCLUSION Our results demonstrate that tomato protects against the clastogenic effects of MNNG by decreasing micronucleated polychromatic erythrocytes and lipid peroxidation and enhancing antioxidant status.
Collapse
Affiliation(s)
- Balaiya Velmurugan
- Department of Biochemistry, Faculty of Science, Annamalai University, Tamil Nadu, India
| | | | | | | |
Collapse
|
31
|
Velayutham M, Villamena FA, Fishbein JC, Zweier JL. Cancer chemopreventive oltipraz generates superoxide anion radical. Arch Biochem Biophys 2005; 435:83-8. [PMID: 15680910 DOI: 10.1016/j.abb.2004.11.028] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2004] [Revised: 11/24/2004] [Indexed: 01/22/2023]
Abstract
The cancer chemopreventive actions of oltipraz, a member of a class of 1,2-dithiolethiones, have been primarily associated with the induction of phase 2 enzymes mediated by a 41bp enhancer element known as the anti-oxidant response element in the promoter regions of many phase 2 genes. It has been suggested that oxygen radical formation by oltipraz may be a critical mechanism by which it exerts chemoprevention. Therefore, in the present work, studies were performed to directly determine if oltipraz generates oxygen free radicals. Electron paramagnetic resonance (EPR) spin trapping demonstrated that oltipraz slowly reacts in the presence of oxygen to generate the superoxide anion radical. This formation of superoxide by oltipraz was concentration- and time-dependent. EPR oximetry studies showed that oxygen was also slowly consumed paralleling the process of superoxide formation. Thus, oltipraz induced superoxide formation occurs and could be involved in the mechanism by which it exerts chemoprotection.
Collapse
Affiliation(s)
- Murugesan Velayutham
- Department of Internal Medicine, Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, The Ohio State University College of Medicine, Columbus, OH 43210, USA
| | | | | | | |
Collapse
|
32
|
Petzer JP, Navamal M, Johnson JK, Kwak MK, Kensler TW, Fishbein JC. Phase 2 enzyme induction by the major metabolite of oltipraz. Chem Res Toxicol 2005; 16:1463-9. [PMID: 14615973 DOI: 10.1021/tx034154e] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Treatment for 48 h of murine Hepa 1c1c7 cells in culture with the cancer chemopreventive oltipraz (1) followed by addition of CD(3)I and immediate cell lysis yields, by LC/MS analysis, three isotopomers of the methylated pyrrolopyrazine (2), a known human metabolite of oltipraz. The major isotopomer (58%) is the one containing two CD(3)- groups attached to the pendant sulfur atoms of the pyrrolopyrazine ring, the others containing one CD(3)- and one CH(3)- group or two CH(3)- groups. It is concluded from this that the unmethylated pyrrolopyrazine (4) is the major metabolite of oltipraz. Prodrugs 5 and 6, which have been shown to rapidly generate 4 in the presence of GSH at physiological pH, induce the phase 2 enzyme NQO1 in Hepa 1c1c7 cells with potencies on par with oltipraz itself: CD(NQO1) = 14.4 +/- 1.3, 20.1 +/- 4.6, and 23.6 +/- 1.6 microM for oltipraz, 5, and 6, respectively. Pretreatment of oltipraz, 5, and 6 in cell culture media with 1 mM GSH, which is shown to immediately convert 5 and 6 to 4, followed by incubation with Hepa 1c1c7 cells shows similar potencies for oltipraz and the (decomposed) produrgs, with CD(NQO1) = 18.0 +/- 4.4 microM for 5, 17.8 +/- 0.2 microM for 6, and 13.5 +/- 1.4 microM for oltipraz. Treatment with compound 6 of murine hepatoma cells containing a luciferase gene under the control of the antioxidant response element (ARE) from the mouse heme oxygenase (ho-1) gene elicits induction of luciferase activity, CD = 35.8 +/- 2.8 microM, somewhat greater than the potency than oltipraz itself. Western blots of nuclear proteins isolated from Hepa 1c1c7 cells and probed with anti-Nrf2 indicate that as compared to vehicle DMSO, compound 6 stimulates nuclear translocation of Nrf2 from the cytosol. From this study, it is concluded that the major metabolite of the cancer chemopreventive oltipraz is a phase 2 enzyme inducer of comparable potency that activates the ARE and initiates nuclear translocation of transcription factor Nrf 2.
Collapse
Affiliation(s)
- Jacobus P Petzer
- Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland 21250, USA
| | | | | | | | | | | |
Collapse
|
33
|
Bjelakovic G, Nikolova D, Simonetti RG, Gluud C. Antioxidant supplements for preventing gastrointestinal cancers. Cochrane Database Syst Rev 2004:CD004183. [PMID: 15495084 DOI: 10.1002/14651858.cd004183.pub2] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Oxidative stress may cause gastrointestinal cancers. The evidence on whether antioxidant supplements are effective in preventing gastrointestinal cancers is contradictory. OBJECTIVES To assess the beneficial and harmful effects of antioxidant supplements in preventing gastrointestinal cancers. SEARCH STRATEGY We identified trials through the trials registers of the four Cochrane Review Groups on gastrointestinal diseases, The Cochrane Central Register of Controlled Trials on The Cochrane Library (Issue 1, 2003), MEDLINE, EMBASE, LILACS, and SCI-EXPANDED from inception to February 2003, and The Chinese Biomedical Database (March 2003). We scanned reference lists and contacted pharmaceutical companies. SELECTION CRITERIA Randomised trials comparing antioxidant supplements to placebo/no intervention examining the incidence of gastrointestinal cancers. DATA COLLECTION AND ANALYSIS Two reviewers independently selected trials for inclusion and extracted data. The outcome measures were incidence of gastrointestinal cancers, overall mortality, and adverse events. Outcomes were reported as relative risks (RR) with 95% confidence interval (CI) based on fixed and random effects meta-analyses. MAIN RESULTS We identified 14 randomised trials (170,525 participants), assessing beta-carotene (9 trials), vitamin A (4 trials), vitamin C (4 trials), vitamin E (5 trials), and selenium (6 trials). Trial quality was generally high. Heterogeneity was low to moderate. Neither the fixed effect (RR 0.96, 95% CI 0.88 to 1.04) nor random effects meta-analyses (RR 0.90, 95% CI 0.77 to 1.05) showed significant effects of supplementation with antioxidants on the incidences of gastrointestinal cancers. Among the seven high-quality trials reporting on mortality (131,727 participants), the fixed effect (RR 1.06, 95% CI 1.02 to 1.10) unlike the random effects meta-analysis (RR 1.06, 95% CI 0.98 to 1.15) showed that antioxidant supplements significantly increased mortality. Two low-quality trials (32,302 participants) found no significant effect of antioxidant supplementation on mortality. The difference between the mortality estimates in high- and low-quality trials was significant by test of interaction (z = 2.10, P = 0.04). Beta-carotene and vitamin A (RR 1.29, 95% CI 1.14 to 1.45) and beta-carotene and vitamin E (RR 1.10, 95% CI 1.01 to 1.20) significantly increased mortality, while beta-carotene alone only tended to do so (RR 1.05, 95% CI 0.99 to 1.11). Increased yellowing of the skin and belching were non-serious adverse effects of beta-carotene. In four trials (three with unclear/inadequate methodology), selenium showed significant beneficial effect on gastrointestinal cancer incidences. REVIEWERS' CONCLUSIONS We could not find evidence that antioxidant supplements prevent gastrointestinal cancers. On the contrary, they seem to increase overall mortality. The potential cancer preventive effect of selenium should be studied in adequately conducted randomised trials.
Collapse
Affiliation(s)
- G Bjelakovic
- Cochrane Hepato-Biliary Group, Copenhagen Trial Unit, Centre for Clinical Intervention Research, Dept. 7102, H:S Rigshospitalet, Copenhagen University Hospital, Blegdamsvej 9, DK 2100 Copenhagen, Denmark.
| | | | | | | |
Collapse
|
34
|
Bjelakovic G, Nikolova D, Simonetti RG, Gluud C. Antioxidant supplements for prevention of gastrointestinal cancers: a systematic review and meta-analysis. Lancet 2004; 364:1219-28. [PMID: 15464182 DOI: 10.1016/s0140-6736(04)17138-9] [Citation(s) in RCA: 440] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND Oxidative stress can cause cancer. Our aim was to establish whether antioxidant supplements reduce the incidence of gastrointestinal cancer and mortality. METHODS With the Cochrane Collaboration methodology, we reviewed all randomised trials comparing antioxidant supplements with placebo for prevention of gastrointestinal cancers. We searched electronic databases and reference lists (February, 2003). Outcome measures were incidence of gastrointestinal cancers, overall mortality, and adverse effects. Outcomes were analysed with fixed-effect and random-effects model meta-analyses and were reported as relative risk with 95% CIs. FINDINGS We identified 14 randomised trials (n=170,525). Trial quality was generally high. Heterogeneity of results was low to moderate. Neither the fixed-effect (relative risk 0.96, 95% CI 0.88-1.04) nor random-effects meta-analyses (0.90, 0.77-1.05) showed significant effects of supplementation with beta-carotene, vitamins A, C, E, and selenium (alone or in combination) versus placebo on oesophageal, gastric, colorectal, pancreatic, and liver cancer incidences. In seven high-quality trials (n=131727), the fixed-effect model showed that antioxidant significantly increased mortality (1.06, 1.02-1.10), unlike the random-effects meta-analysis (1.06, 0.98-1.15). Low-quality trials showed no significant effect of antioxidant supplementation on mortality. The difference between the mortality estimates in high-quality and low-quality trials was significant (Z=2.10, p=0.04 by test of interaction). beta-carotene and vitamin A (1.29, 1.14-1.45) and beta-carotene and vitamin E (1.10, 1.01-1.20) significantly increased mortality, whereas beta-carotene alone only tended to increase mortality (1.05, 0.99-1.11). In four trials (three with unclear or inadequate methodology), selenium showed significant beneficial effect on the incidence of gastrointestinal cancer. INTERPRETATION We could not find evidence that antioxidant supplements can prevent gastrointestinal cancers; on the contrary, they seem to increase overall mortality. The potential preventive effect of selenium should be studied in adequate randomised trials.
Collapse
Affiliation(s)
- Goran Bjelakovic
- The Cochrane Hepato-Biliary Group, Copenhagen Trial Unit, Centre for Clinical Intervention Research, Copenhagen University Hospital, H:S Rigshospitalet, Copenhagen, Denmark.
| | | | | | | |
Collapse
|
35
|
Arivazhagan S, Velmurugan B, Bhuvaneswari V, Nagini S. Effects of Aqueous Extracts of Garlic (Allium sativum) and Neem (Azadirachta indica) Leaf on Hepatic and Blood Oxidant-Antioxidant Status During Experimental Gastric Carcinogenesis. J Med Food 2004; 7:334-9. [PMID: 15383228 DOI: 10.1089/jmf.2004.7.334] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The modifying effects of aqueous extracts of garlic and neem leaf during the pre-initiation and post-initiation phases of gastric carcinogenesis induced by N-methyl-N'-nitro-N-nitrosoguanidine were investigated in male Wistar rats. The extent of lipid peroxidation and the status of phase II biotransformation enzymes such as glutathione peroxidase and glutathione-S-transferase that use reduced glutathione (GSH) as substrate were used to biomonitor the chemopreventive potential of these extracts. Enhanced lipid peroxidation in the liver and blood of tumor-bearing animals was accompanied by significant decreases in the activities of GSH-dependent antioxidants in the pre-initiation as well as in the post-initiation phases. Our results suggest that the modulatory effects of garlic and neem leaf on hepatic and blood oxidant-antioxidant status may play a key role in preventing cancer development at extrahepatic sites.
Collapse
Affiliation(s)
- S Arivazhagan
- Department of Biochemistry, Faculty of Science, Annamalai University, Annamalainagar, Tamil Nadu, India
| | | | | | | |
Collapse
|
36
|
Murdoch WJ, Martinchick JF. Oxidative damage to DNA of ovarian surface epithelial cells affected by ovulation: carcinogenic implication and chemoprevention. Exp Biol Med (Maywood) 2004; 229:546-52. [PMID: 15169974 DOI: 10.1177/153537020422900613] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The majority of cancers of the ovary are thought to originate from a surface epithelial cell perturbed by ovulation. Outgrowth of a follicle destined to ovulate brings it into apposition with the ovarian epithelium. Ovarian surface cells are consequently exposed, within a limited diffusion radius, to inflammatory agents and reactive oxidants generated during periovulatory processes. Cells that overlie the formative site of follicular rupture suffer irreparable damages and undergo apoptosis. Potentially mutagenic 8-oxoguanine modifications were detected in (surviving) cells circumjacent to postovulatory ovine and human follicles. It is conceivable that clonal expansion of a cell with unrepaired DNA, but not committed to death, could be an initiating factor in the etiology of malignancy, insofar as proliferative ovulatory wound-repair responses may propagate mutations. Since the prognosis for ovarian cancer patients with invasive disease is so poor, and early detection has proven elusive, it is imperative that prospective methods of chemo-prevention be explored. Ovulation-induced oxidative base damages to the ovarian epithelium of ewes were prevented by vitamin E. Oxoguanine adducts persisted and CA-125 (a phenotype of metaplastic transformation) was expressed in cultures of cells that were distressed by ovulation in which p53 synthesis was inhibited. Vitamin E negated this reaction. Ovarian cyclicity and fertility were not altered in vitamin-treated ewes. A prophylactic benefit of a supplemental antioxidant is suggested in "ovulating" individuals designated at risk (e.g., due to a tumor suppressor malfunction) for the development of ovarian cancer.
Collapse
Affiliation(s)
- William J Murdoch
- Department of Animal Science and Reproductive Biology Program, University of Wyoming, Laramie, Wyoming 82071, USA.
| | | |
Collapse
|
37
|
Sauvaget C, Kasagi F, Waldren CA. Dietary factors and cancer mortality among atomic-bomb survivors. Mutat Res 2004; 551:145-52. [PMID: 15225589 DOI: 10.1016/j.mrfmmm.2004.01.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2003] [Revised: 01/20/2004] [Accepted: 01/22/2004] [Indexed: 04/30/2023]
Abstract
Dietary factors such as fruit and vegetables are thought to reduce the risk of cancer incidence and mortality. We investigated the effect of a diet rich in fruit and vegetables against the long-term effects of radiation exposure on the risk of cancer. A cohort of 36,228 atomic-bomb survivors of Hiroshima and Nagasaki, for whom radiation dose estimates were currently available, had their diet assessed in 1980. They were followed for a period of 20 years for cancer mortality. The joint-effect of fruit and vegetables intake and radiation exposure on risk of cancer death was examined, in additive (sum of effects of diet alone and radiation alone) and multiplicative (product of effects of diet alone and radiation alone) models. In the additive model, a daily intake of fruit and vegetables significantly reduced the risk of cancer deaths by 13%, compared to an intake of once or less per week. Radiation exposure of 1 Sievert (Sv) increased significantly the risk of cancer death by 48-49%. The additive joint-effects showed a lower risk of cancer among those exposed to 1 Sv who had a diet rich in vegetables (49%-13%=36%) or fruit (48%-13%=35%). The multiplicative model gave similar results. The cancer risk reduction by vegetables in exposed persons went from 52% (effect of radiation alone) to 32% (product of effect of vegetables and radiation), and cancer risk reduction by fruit was 52% (radiation alone) to 34% (product of effect of fruit and radiation). There was no significant evidence to reject either the additive or the multiplicative model. A daily intake of fruit and vegetables was beneficial to the persons exposed to radiation in reducing their risks of cancer death.
Collapse
Affiliation(s)
- Catherine Sauvaget
- Department of Epidemiology, Radiation Effects Research Foundation, 5-2 Hijiyama Park, Minami-ku, 732-0815 Hiroshima, Japan.
| | | | | |
Collapse
|
38
|
Abstract
Hepatocellular carcinoma is a significant cause of mortality worldwide and a growing problem in the United States. Treatment options are often limited, and median survival is less than 1 year. Thus, prevention may provide the best opportunity to alter the natural history of this disease. Primary prevention is best exemplified by the successes of such public health measures as universal hepatitis B vaccination. Such antiviral therapies as interferon may also have a role. Lessons can be learned from complementary and alternative medicine. Nevertheless, more work is needed in understanding hepatocarcinogenesis and in developing models to assess potential chemopreventive agents.
Collapse
Affiliation(s)
- Will J Fecht
- Division of Gastroenterology and Hepatology, Saint Louis University School of Medicine, 3635 Vista at Grand Avenue FDT 9S, St. Louis, MO 63110-0250, USA.
| | | |
Collapse
|
39
|
Zhou S, Koh HL, Gao Y, Gong ZY, Lee EJD. Herbal bioactivation: the good, the bad and the ugly. Life Sci 2004; 74:935-68. [PMID: 14672753 PMCID: PMC7127148 DOI: 10.1016/j.lfs.2003.09.035] [Citation(s) in RCA: 142] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2003] [Accepted: 09/03/2003] [Indexed: 12/19/2022]
Abstract
It has been well established that the formation of reactive metabolites of drugs is associated with drug toxicity. Similarly, there are accumulating data suggesting the role of the formation of reactive metabolites/intermediates through bioactivation in herbal toxicity and carcinogenicity. It has been hypothesized that the resultant reactive metabolites following herbal bioactivation covalently bind to cellular proteins and DNA, leading to toxicity via multiple mechanisms such as direct cytotoxicity, oncogene activation, and hypersensitivity reactions. This is exemplified by aristolochic acids present in Aristolochia spp, undergoing reduction of the nitro group by hepatic cytochrome P450 (CYP1A1/2) or peroxidases in extrahepatic tissues to reactive cyclic nitrenium ion. The latter was capable of reacting with DNA and proteins, resulting in activation of H-ras oncogene, gene mutation and finally carcinogenesis. Other examples are pulegone present in essential oils from many mint species; and teucrin A, a diterpenoid found in germander (Teuchrium chamaedrys) used as an adjuvant to slimming diets. Extensive pulegone metabolism generated p-cresol that was a glutathione depletory, and the furan ring of the diterpenoids in germander was oxidized by CYP3A4 to reactive epoxide which reacts with proteins such as CYP3A and epoxide hydrolase. On the other hand, some herbal/dietary constituents were shown to form reactive intermediates capable of irreversibly inhibiting various CYPs. The resultant metabolites lead to CYP inactivation by chemical modification of the heme, the apoprotein, or both as a result of covalent binding of modified heme to the apoprotein. Some examples include bergamottin, a furanocoumarin of grapefruit juice; capsaicin from chili peppers; glabridin, an isoflavan from licorice root; isothiocyanates found in all cruciferous vegetables; oleuropein rich in olive oil; dially sulfone found in garlic; and resveratrol, a constituent of red wine. CYPs have been known to metabolize more than 95% therapeutic drugs and activate a number of procarcinogens as well. Therefore, mechanism-based inhibition of CYPs may provide an explanation for some reported herb-drug interactions and chemopreventive activity of herbs. Due to the wide use and easy availability of herbal medicines, there is increasing concern about herbal toxicity. The safety and quality of herbal medicine should be ensured through greater research, pharmacovigilance, greater regulatory control and better communication between patients and health professionals.
Collapse
Affiliation(s)
- Shufeng Zhou
- Department of Pharmacy, Faculty of Science, National University of Singapore, Singapore, 117543.
| | | | | | | | | |
Collapse
|
40
|
Chandra Mohan KVP, Bhuvaneswari V, Abraham SK, Nagini S. Dose-Dependent Protection by Tomato Against 7,12-Dimethylbenz[a]anthracene-Induced Genotoxicity and Oxidative Stress in Mice. J Med Food 2003; 6:169-73. [PMID: 14585182 DOI: 10.1089/10966200360716571] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
This study was designed to investigate the protective role of pretreatment with graded doses of freshly prepared tomato paste against 7,12-dimethylbenz[a]anthracene (DMBA)-induced genetic damage and oxidative stress in male Swiss mice. The incidence of bone marrow micronuclei and the extent of hepatic lipid peroxidation and the antioxidants glutathione, glutathione peroxidase, and glutathione S-transferase were monitored. Three different concentrations (0.5, 1, and 2 g/kg body weight) of tomato paste were tested for their anticlastogenic effects against DMBA (35 mg/kg body weight). Increased frequency of micronuclei and enhanced lipid peroxidation accompanied by compromised antioxidant defenses were observed in DMBA-treated animals. Pretreatment with all three doses of tomato paste significantly reduced the frequencies of DMBA-induced micronuclei and oxidative stress. These findings demonstrate that administration of tomato paste protects against the clastogenic effects of DMBA by decreasing lipid peroxidation and enhancing the antioxidant status.
Collapse
Affiliation(s)
- K V P Chandra Mohan
- Department of Biochemistry, Faculty of Science, Annamalai University, Annamalainagar-608 002, Tamil Nadu, India
| | | | | | | |
Collapse
|
41
|
Dose-response effects of tomato lycopene on lipid peroxidation and enzymic antioxidants in the hamster buccal pouch carcinogenesis model. Nutr Res 2003. [DOI: 10.1016/s0271-5317(03)00125-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
|
42
|
Belenky M, Prasain J, Kim H, Barnes S. DING, a genistein target in human breast cancer: a protein without a gene. J Nutr 2003; 133:2497S-2501S. [PMID: 12840230 DOI: 10.1093/jn/133.7.2497s] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Because most noncancer cells are tolerant to high micromolar concentrations of genistein (GEN), inhibitory or stimulatory effects of GEN have been claimed for a wide variety of biochemical targets that lead to a plethora of potential mechanisms. However, because GEN is present in tissues in the nanomol-per-liter range, most of these mechanisms are unlikely to be relevant in vivo. To better identify proteins that are targets of GEN, we used a GEN-agarose-affinity phase. Cytosols from human breast cancer MCF-7 cells were fractionated over a Sephadex diethylaminoethyl column, and nonabsorbed proteins in the flow-through were affinity absorbed onto a 2-carboxygenistein-agarose column. After proteins were washed with 100 mmol NaCl/L to remove weakly bound proteins, affinity elution was conducted with 1 mmol 2-carboxygenistein/L. Using this method, a p38 protein was recovered from MCF-7 cells. N-terminal chemical sequencing of the first 30 residues of the protein revealed a peptide sequence similar to those that have been discovered in human tissues (a T-cell attractant protein from synovial fluid from patients with osteoarthritis and an analogous human skin fibroblast protein using a hirudin-affinity column) as well as a cotonine-binding protein from rat brain and related proteins in plants. In each case, the corresponding gene has not been found. In conclusion, although much of the human genome has been sequenced, novel proteins that are not described by genome data remain to be found. The DING protein (N-terminal amino acid sequence Asp-Ile-Asn-Gly) that binds to genistein with high affinity is one of these. Its biological role, however, remains to be defined.
Collapse
Affiliation(s)
- Michael Belenky
- Department of Biochemistry and Molecular Genetics and Pharmacology and Toxicology, University of Alabama at Birmingham, AL 35294, USA
| | | | | | | |
Collapse
|
43
|
Abstract
Smoking prevention and cessation remain the primary methods of reducing the incidence of lung cancer. The limited success of efforts towards smoking cessation have led to increasing interest in the role of nutrition in lung cancer prevention. One class of nutrients that has attracted attention as potential chemopreventive agents is the carotenoids, especially beta-carotene, due to their antioxidant properties. In vitro, carotenoids exert antioxidant functions and inhibit carcinogen-induced neoplastic transformation, inhibit plasma membrane lipid oxidation, and cause upregulated expression of connexin 43. These in vitro results suggest that carotenoids have intrinsic cancer chemopreventive action in humans. Many cohort and case-control study data have shown an inverse relationship between fruit and vegetable consumption and lung cancer, although several more recent studies have cast doubt on these findings. Different effects of various dietary nutrients on lung cancer risk have been observed. Several prospective intervention trials were undertaken to examine the effect of supplementation on the risk of lung cancer. Some of these studies demonstrated an increased incidence and mortality from lung cancer in those receiving supplementation. Many hypotheses have emerged as to the reasons for these findings.
Collapse
Affiliation(s)
- Kenneth R Epstein
- Department of Medicine, Jefferson Medical College, Thomas Jefferson University, Philadelphia, PA 19107, USA
| |
Collapse
|
44
|
Gao Y, Zhou S. Cancer Prevention and Treatment byGanoderma, a Mushroom with Medicinal Properties. FOOD REVIEWS INTERNATIONAL 2003. [DOI: 10.1081/fri-120023480] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
|
45
|
|
46
|
Grant WB, Garland CF. Evidence supporting the role of vitamin D in reducing the risk of cancer. J Intern Med 2002; 252:178-9; author reply 179-80. [PMID: 12190894 DOI: 10.1046/j.1365-2796.2002.01016.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|