1
|
Wang L, Tang Z, Li B, Peng Y, Yang X, Xiao Y, Ni R, Qi XL. Myricetin ameliorates cognitive impairment in 3×Tg Alzheimer's disease mice by regulating oxidative stress and tau hyperphosphorylation. Biomed Pharmacother 2024; 177:116963. [PMID: 38889642 DOI: 10.1016/j.biopha.2024.116963] [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: 04/22/2024] [Revised: 06/13/2024] [Accepted: 06/15/2024] [Indexed: 06/20/2024] Open
Abstract
BACKGROUND Alzheimer's disease is characterized by abnormal β-amyloid (Aβ) plaque accumulation, tau hyperphosphorylation, reactive oxidative stress, mitochondrial dysfunction and synaptic loss. Myricetin, a dietary flavonoid, has been shown to exert neuroprotective effects in vitro and in vivo. Here, we aimed to elucidate the mechanism and pathways involved in the protective effect of myricetin. METHODS The effect of myricetin was assessed on Aβ42 oligomer-treated neuronal SH-SY5Y cells and in 3×Tg mice. Behavioral tests were performed to assess the cognitive effects of myricetin (14 days, ip) in 3×Tg mice. The levels of beta-amyloid precursor protein (APP), synaptic and mitochondrial proteins, glycogen synthase kinase3β (GSK3β) and extracellular regulated kinase (ERK) 2 were assessed via Western blotting. Flow cytometry assays, immunofluorescence staining, and transmission electron microscopy were used to assess mitochondrial dysfunction and reactive oxidative stress. RESULTS We found that, compared with control treatment, myricetin treatment improved spatial cognition and learning and memory in 3×Tg mice. Myricetin ameliorated tau phosphorylation and the reduction in pre- and postsynaptic proteins in Aβ42 oligomer-treated neuronal SH-SY5Y cells and in 3×Tg mice. In addition, myricetin reduced reactive oxygen species generation, lipid peroxidation, and DNA oxidation, and rescued mitochondrial dysfunction via the associated GSK3β and ERK 2 signalling pathways. CONCLUSIONS This study provides new insight into the neuroprotective mechanism of myricetin in vitro in cell culture and in vivo in a mouse model of Alzheimer's disease.
Collapse
Affiliation(s)
- Li Wang
- Key Laboratory of Endemic and Ethnic Diseases, Ministry of Education and Key Laboratory of Medical Molecular Biology of Guizhou Province, Key Laboratory of Molecular Biology of Guizhou Medical University, Guiyang, China
| | - Zhi Tang
- Key Laboratory of Endemic and Ethnic Diseases, Ministry of Education and Key Laboratory of Medical Molecular Biology of Guizhou Province, Key Laboratory of Molecular Biology of Guizhou Medical University, Guiyang, China
| | - Bo Li
- Key Laboratory of Endemic and Ethnic Diseases, Ministry of Education and Key Laboratory of Medical Molecular Biology of Guizhou Province, Key Laboratory of Molecular Biology of Guizhou Medical University, Guiyang, China
| | - Yaqian Peng
- Key Laboratory of Endemic and Ethnic Diseases, Ministry of Education and Key Laboratory of Medical Molecular Biology of Guizhou Province, Key Laboratory of Molecular Biology of Guizhou Medical University, Guiyang, China
| | - Xi Yang
- Guiyang Healthcare Vocational University, Guizhou ERC for Medical Resources & Healthcare Products (Guizhou Engineering Research Center for Medical Resources and Healthcare Products), Guiyang, Guizhou, China
| | - Yan Xiao
- Key Laboratory of Endemic and Ethnic Diseases, Ministry of Education and Key Laboratory of Medical Molecular Biology of Guizhou Province, Key Laboratory of Molecular Biology of Guizhou Medical University, Guiyang, China
| | - Ruiqing Ni
- Institute for Regenerative Medicine, University of Zurich, Zurich, Switzerland; Institute for Biomedical Engineering, ETH Zurich & University of Zurich, Zurich, Switzerland.
| | - Xiao-Lan Qi
- Key Laboratory of Endemic and Ethnic Diseases, Ministry of Education and Key Laboratory of Medical Molecular Biology of Guizhou Province, Key Laboratory of Molecular Biology of Guizhou Medical University, Guiyang, China; Collaborative Innovation Center for Prevention and Control of Endemic and Ethnic Regional Diseases Constructed by the Province and Ministry, Guiyang, China.
| |
Collapse
|
2
|
Adegbola PI, Adetutu A. Genetic and epigenetic modulations in toxicity: The two-sided roles of heavy metals and polycyclic aromatic hydrocarbons from the environment. Toxicol Rep 2024; 12:502-519. [PMID: 38774476 PMCID: PMC11106787 DOI: 10.1016/j.toxrep.2024.04.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 04/27/2024] [Accepted: 04/27/2024] [Indexed: 05/24/2024] Open
Abstract
This study emphasizes the importance of considering the metabolic and toxicity mechanisms of environmental concern chemicals in real-life exposure scenarios. Furthermore, environmental chemicals may require metabolic activation to become toxic, and competition for binding sites on receptors can affect the severity of toxicity. The multicomplex process of chemical toxicity is reflected in the activation of multiple pathways during toxicity of which AhR activation is major. Real-life exposure to a mixture of concern chemicals is common, and the composition of these chemicals determines the severity of toxicity. Nutritional essential elements can mitigate the toxicity of toxic heavy metals, while the types and ratio of composition of PAH can either increase or decrease toxicity. The epigenetic mechanisms of heavy metals and PAH toxicity involves either down-regulation or up-regulation of some non-coding RNAs (ncRNAs) whereas specific small RNAs (sRNAs) may have dual role depending on the tissue and circumstance of expression. Similarly, decrease DNA methylation and histone modification are major players in heavy metals and PAH mediated toxicity and FLT1 hypermethylation is a major process in PAH induced carcinogenesis. Overall, this review provides the understanding of the metabolism of environmental concern chemicals, emphasizing the importance of considering mixed compositions and real-life exposure scenarios in assessing their potential effects on human health and diseases development as well as the dual mechanism of toxicity via genetic or epigenetic axis.
Collapse
Affiliation(s)
- Peter Ifeoluwa Adegbola
- Department of Biochemistry and Forensic Science, First Technical University, Ibadan, Nigeria
| | - Adewale Adetutu
- Department of Biochemistry, Faculty of Basic Medical Sciences, Ladoke Akintola University of Technology, Ogbomoso, Nigeria
| |
Collapse
|
3
|
Javed Z, Khan K, Herrera-Bravo J, Naeem S, Iqbal MJ, Raza Q, Sadia H, Raza S, Bhinder M, Calina D, Sharifi-Rad J, Cho WC. Myricetin: targeting signaling networks in cancer and its implication in chemotherapy. Cancer Cell Int 2022; 22:239. [PMID: 35902860 PMCID: PMC9336020 DOI: 10.1186/s12935-022-02663-2] [Citation(s) in RCA: 39] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Accepted: 07/22/2022] [Indexed: 02/06/2023] Open
Abstract
The gaps between the complex nature of cancer and therapeutics have been narrowed down due to extensive research in molecular oncology. Despite gathering massive insight into the mysteries of tumor heterogeneity and the molecular framework of tumor cells, therapy resistance and adverse side effects of current therapeutic remain the major challenge. This has shifted the attention towards therapeutics with less toxicity and high efficacy. Myricetin a natural flavonoid has been under the spotlight for its anti-cancer, anti-oxidant, and anti-inflammatory properties. The cutting-edge molecular techniques have shed light on the interplay between myricetin and dysregulated signaling cascades in cancer progression, invasion, and metastasis. However, there are limited data available regarding the nano-delivery platforms composed of myricetin in cancer. In this review, we have provided a comprehensive detail of myricetin-mediated regulation of different cellular pathways, its implications in cancer prevention, preclinical and clinical trials, and its current available nano-formulations for the treatment of various cancers.
Collapse
Affiliation(s)
- Zeeshan Javed
- grid.512552.40000 0004 5376 6253Office of Research Innovation and Commercialization, Lahore Garrison University, Lahore, Pakistan
| | - Khushbukhat Khan
- grid.412117.00000 0001 2234 2376Department of Healthcare Biotechnology, Atta-ur-Rahman School of Applied Biosciences, National University of Sciences and Technology, Sector H-12, Islamabad, 44000 Pakistan
| | - Jesús Herrera-Bravo
- grid.441783.d0000 0004 0487 9411Departamento de Ciencias Básicas, Facultad de Ciencias, Universidad Santo Tomas, Santiago, Chile
- grid.412163.30000 0001 2287 9552Center of Molecular Biology and Pharmacogenetics, Scientific and Technological Bioresource Nucleus, Universidad de La Frontera, 4811230 Temuco, Chile
| | - Sajid Naeem
- grid.32566.340000 0000 8571 0482Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, School of Life Sciences, Lanzhou University, Lanzhou, 730000 China
| | - Muhammad Javed Iqbal
- grid.513947.d0000 0005 0262 5685Department of Biotechnology, Faculty of Sciences, University of Sialkot, Sialkot, Pakistan
| | - Qamar Raza
- grid.412967.f0000 0004 0609 0799Institute of Biochemistry and Biotechnology, University of Veterinary and Animal Sciences, Lahore, Punjab Pakistan
| | - Haleema Sadia
- grid.440526.10000 0004 0609 3164Department of Biotechnology, Balochistan University of Information Technology, Engineering and Management Sciences, Quetta, 87100 Pakistan
| | - Shahid Raza
- grid.512552.40000 0004 5376 6253Office of Research Innovation and Commercialization, Lahore Garrison University, Lahore, Pakistan
| | - Munir Bhinder
- grid.412956.d0000 0004 0609 0537Department of Human Genetics & Molecular Biology, University of Health Sciences, Lahore, 54600 Pakistan
| | - Daniela Calina
- grid.413055.60000 0004 0384 6757Department of Clinical Pharmacy, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Javad Sharifi-Rad
- grid.442126.70000 0001 1945 2902Facultad de Medicina, Universidad del Azuay, Cuenca, Ecuador
| | - William C. Cho
- grid.415499.40000 0004 1771 451XDepartment of Clinical Oncology, Queen Elizabeth Hospital, Kowloon, Hong Kong China
| |
Collapse
|
4
|
Stoll S, Bitencourt S, Laufer S, Inês Goettert M. Myricetin inhibits panel of kinases implicated in tumorigenesis. Basic Clin Pharmacol Toxicol 2019; 125:3-7. [PMID: 30624861 DOI: 10.1111/bcpt.13201] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Accepted: 01/03/2019] [Indexed: 12/16/2022]
Abstract
Myricetin is a flavonoid with several biological properties, including antioxidant and anti-inflammatory features. Its protective effect in chronic diseases may occur through the inhibition of protein kinases that trigger inflammation and carcinogenesis pathways. Considering the influence of kinases on such pathological disorders, it is crucial to study compounds that inhibit these proteins. This study aims to evaluate the inhibitory potential of 14 flavonoids on TNF-α release in human whole blood as well as the inhibitory potential of myricetin towards kinases involved in tumorigenesis. Our results showed that, out of all flavonoids, myricetin had the highest inhibitory effect on TNF-α level. In addition, myricetin showed potential as a multi-anti-kinase compound, reducing the activity of 7 kinases by >70% and of 9 kinases by >90%. Together these data demonstrate the great inhibitory activity of myricetin on tumorigenic kinases and potential for the development of new therapeutics.
Collapse
Affiliation(s)
- Stefani Stoll
- Cell Culture Laboratory, Postgraduate Program in Biotechnology, University of Taquari Valley (Univates), Lajeado, Brazil
| | - Shanna Bitencourt
- Cell Culture Laboratory, Postgraduate Program in Biotechnology, University of Taquari Valley (Univates), Lajeado, Brazil
| | - Stefan Laufer
- Department of Pharmaceutical and Medicinal Chemistry, Institute of Pharmacy, University of Tübingen, Tübingen, Germany
| | - Márcia Inês Goettert
- Cell Culture Laboratory, Postgraduate Program in Biotechnology, University of Taquari Valley (Univates), Lajeado, Brazil
| |
Collapse
|
5
|
de Silva MB, Tencomnao T. The protective effect of some Thai plants and their bioactive compounds in UV light-induced skin carcinogenesis. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2018; 185:80-89. [PMID: 29879588 DOI: 10.1016/j.jphotobiol.2018.04.046] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 04/27/2018] [Accepted: 04/30/2018] [Indexed: 12/19/2022]
Abstract
Skin cancer, represents a major public health concern. While the vast majority is non-melanoma skin cancers, melanomas are mostly responsible for mortality. Solar UVB radiation is mutagenic and carcinogenic. It is primarily responsible for both non-melanoma and melanoma skin cancers via excessive production of reactive oxygen species (ROS), which mediate changes in inflammation and immunity, and have been implicated in all three stages of skin cancer development. Due to their regulatory role in numerous functions of cells, signaling pathways are targets for chemoprevention. The current standards in melanoma therapy are targeted and combination therapies, which, albeit prolong survival responses, are still prone to development of drug resistance. To this extent, drugs of natural origin continue to spark great interest. Thailand has a rich biodiversity of indigenous flora, which have traditionally been used to treat a variety of pathologies. The active components in plant extracts that have medicinal properties, termed 'bioactive compounds,' are efficient chemopreventive agents due to their antioxidant, antimutagenic, anticarcinogenic, and carcinogen detoxification properties. Thai plants and their bioactive compounds have shown protective effects on UV light-induced skin cancer in different experimental models. This warrants further in vivo investigations and translation to clinical studies to determine efficacy and safety, for use as lead compounds in targeted/combination therapy or adjuvant therapy with existing regimes. Coupled with a strategy for prevention, this offers a promising outlook for protection against photocarcinogenesis.
Collapse
Affiliation(s)
- Madhura B de Silva
- Age-Related Inflammation and Degeneration Research Unit, Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, 154 Rama I Road, Pathumwan, Bangkok 10330, Thailand
| | - Tewin Tencomnao
- Age-Related Inflammation and Degeneration Research Unit, Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, 154 Rama I Road, Pathumwan, Bangkok 10330, Thailand.
| |
Collapse
|
6
|
Dey P, Roy Chowdhuri S, Sarkar MP, Chaudhuri TK. Evaluation of anti-inflammatory activity and standardisation of hydro-methanol extract of underground tuber of Dioscorea alata. PHARMACEUTICAL BIOLOGY 2016; 54:1474-1482. [PMID: 26864460 DOI: 10.3109/13880209.2015.1104702] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Context The underground edible tuber of Dioscorea alata L. (Dioscoreaceae) is a functional food with high nutritive value and therapeutic potential. The tuber is known to possess anti-inflammatory properties in traditional medicine. Objective The present study explores the anti-inflammatory activity and standardisation of D. alata tuber hydromethanol extract. Materials and methods Hydromethanol extract (70%) of D. alata tuber was chemically characterised using HPLC and GC-MS techniques. Murine lymphocytes were cultured for 48 h with six different concentrations (0-80 μg/mL) of the extract. The expression of nitric oxide (NO), TNF-α, COX-1, COX-2, and PGE2 were evaluated using colorimetric and ELISA methods. Results Dioscorea alata extract inhibited the expression of NO and TNF-α with an IC50 value of 134.51 ± 6.75 and 113.30 ± 7.44 μg/mL, respectively. The IC50 values for inhibition of total COX, COX-1, COX-2 activities and PGE2 level were 41.96 ± 3.07, 141.41 ± 8.99, 32.50 ± 1.69, and 186.34 ± 15.36 μg/mL, respectively. Inhibition of PGE2 level and COX-2 activity was positively correlated (R(2) = 0.9393). Gallic acid (GA), 4-hydroxy benzoic acid (4HBA), syringic acid (SYA), p-coumaric acid (PCA), and myricetin (MY) were identified and quantified using HPLC. GC-MS analysis revealed the presence of 13 different phytocompounds such as hexadecanoic acid, methyl stearate, cinnamyl cinnamate, and squalene. Conclusion The D. alata extract significantly down-regulated the pro-inflammatory signals in a gradual manner compared with control (0 μg/mL). Different bioactive phytocompounds individually possessing anti-inflammatory activities contributed to the overall bioactivity of the D. alata tuber extract.
Collapse
Affiliation(s)
- Priyankar Dey
- a Cellular Immunology Laboratory, Department of Zoology , University of North Bengal , Siliguri , West Bengal , India
| | - Sumedha Roy Chowdhuri
- b Chemical Signal and Lipidomics Laboratory, Department of Botany , University of Calcutta , Kolkata , West Bengal , India
| | - Mousumi Poddar Sarkar
- b Chemical Signal and Lipidomics Laboratory, Department of Botany , University of Calcutta , Kolkata , West Bengal , India
| | - Tapas Kumar Chaudhuri
- a Cellular Immunology Laboratory, Department of Zoology , University of North Bengal , Siliguri , West Bengal , India
| |
Collapse
|
7
|
Dey P, Ray S, Chaudhuri TK. Immunomodulatory activities and phytochemical characterisation of the methanolic extract of Dioscorea alata aerial tuber. J Funct Foods 2016. [DOI: 10.1016/j.jff.2016.02.044] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
8
|
Gu L, Wu Y, Hu S, Chen Q, Tan J, Yan Y, Liang B, Tang N. Analysis of Association between MAP2K4 Gene Polymorphism rs3826392 and IL-1b Serum Level in Southern Chinese Han Ischemic Stroke Patients. J Stroke Cerebrovasc Dis 2016; 25:1096-1101. [PMID: 26856463 DOI: 10.1016/j.jstrokecerebrovasdis.2015.12.035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Revised: 12/18/2015] [Accepted: 12/29/2015] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Mitogen-activated protein kinase kinase 4 (MAP2K4) gene acts as the direct upstream activator of c-Jun NH2-terminal kinase pathway, which plays an important role in regulating neuron survival and apoptosis in response to cerebral ischemia. However, the association between MAP2K4 gene polymorphisms and ischemic stroke (IS) has not yet been published. Therefore, this study investigates the association between MAP2K4 gene polymorphism rs3826392 and IS susceptibility, as well as its quantitative traits in Southern Chinese Han population. METHODS A total of 816 Chinese patients with IS and 816 age- and sex-matched controls were recruited. Rs3826392 was genotyped using Sequenom MassARRAY iPLEX platform (Sequenom, San Diego, CA, USA). The mRNA expression of MAP2K4 gene in peripheral blood mononuclear cells was detected using reverse transcription-polymerase chain reaction. The levels of serum cytokines, including IL-1b, IL-6, IL-8, IL-12, and tumor necrosis factor-α (TNF-α), were measured by enzyme-linked immunosorbent assay. RESULTS Significant association was not observed between MAP2K4 gene polymorphism rs3826392 and IS susceptibility in all genetic models (P > .05). A significant difference was found in IL-1b, IL-6, IL-8, and TNF-α serum levels between patients with IS and control groups. MAP2K4 gene polymorphism rs3826392 C/A genotype carriers showed significantly higher IL-1b serum levels compared with AA genotype carriers (P = .029) in patients with IS. CONCLUSION MAP2K4 gene polymorphism rs3826392 did not contribute to IS susceptibility, but rs3826392 C/A genotype carriers showed significantly higher IL-1b serum levels. This result suggests that rs3826392 may play a potential role in the IS inflammatory process.
Collapse
Affiliation(s)
- Lian Gu
- Department of Internal Neurology, First Affiliated Hospital of Guangxi University of Chinese Medicine, Nanning, Guangxi, China
| | - Yanli Wu
- Department of Internal Neurology, First Affiliated Hospital of Guangxi University of Chinese Medicine, Nanning, Guangxi, China
| | - Shuyan Hu
- Department of Internal Neurology, First Affiliated Hospital of Guangxi University of Chinese Medicine, Nanning, Guangxi, China
| | - Qing Chen
- Department of Internal Neurology, First Affiliated Hospital of Guangxi University of Chinese Medicine, Nanning, Guangxi, China
| | - Jinjing Tan
- Department of Internal Neurology, First Affiliated Hospital of Guangxi University of Chinese Medicine, Nanning, Guangxi, China
| | - Yan Yan
- Department of Internal Neurology, First Affiliated Hospital of Guangxi University of Chinese Medicine, Nanning, Guangxi, China
| | - Baoyun Liang
- Department of Internal Neurology, First Affiliated Hospital of Guangxi University of Chinese Medicine, Nanning, Guangxi, China
| | - Nong Tang
- First Affiliated Hospital of Guangxi University of Chinese Medicine, Nanning, Guangxi, China.
| |
Collapse
|
9
|
Mondal S, Jana J, Sengupta P, Jana S, Chatterjee S. Myricetin arrests human telomeric G-quadruplex structure: a new mechanistic approach as an anticancer agent. MOLECULAR BIOSYSTEMS 2016; 12:2506-18. [DOI: 10.1039/c6mb00218h] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The use of small molecules to arrest G-quadruplex structure has become a potential strategy for the development and design of a new class of anticancer therapeutics.
Collapse
Affiliation(s)
- Soma Mondal
- Department of Biophysics
- Bose Institute
- Kolkata-700054
- India
| | - Jagannath Jana
- Department of Biophysics
- Bose Institute
- Kolkata-700054
- India
| | | | - Samarjit Jana
- Department of Zoology
- West Bengal State University
- Kolkata-126
- India
| | | |
Collapse
|
10
|
Yuan X, Liu Y, Hua X, Deng X, Sun P, Yu C, Chen L, Yu S, Liu S, Pang H. Myricetin ameliorates the symptoms of collagen-induced arthritis in mice by inhibiting cathepsin K activity. Immunopharmacol Immunotoxicol 2015; 37:513-9. [DOI: 10.3109/08923973.2015.1096942] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
|
11
|
Gupta SC, Tyagi AK, Deshmukh-Taskar P, Hinojosa M, Prasad S, Aggarwal BB. Downregulation of tumor necrosis factor and other proinflammatory biomarkers by polyphenols. Arch Biochem Biophys 2014; 559:91-9. [DOI: 10.1016/j.abb.2014.06.006] [Citation(s) in RCA: 154] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2014] [Revised: 06/03/2014] [Accepted: 06/06/2014] [Indexed: 02/07/2023]
|
12
|
Jarvis I, Bergvall C, Morales D, Kummrow F, Umbuzeiro G, Westerholm R, Stenius U, Dreij K. Nanomolar levels of PAHs in extracts from urban air induce MAPK signaling in HepG2 cells. Toxicol Lett 2014; 229:25-32. [DOI: 10.1016/j.toxlet.2014.06.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Revised: 06/04/2014] [Accepted: 06/05/2014] [Indexed: 12/13/2022]
|
13
|
Gutiérrez-Venegas G, Luna OA, Arreguín-Cano JA, Hernández-Bermúdez C. Myricetin blocks lipoteichoic acid-induced COX-2 expression in human gingival fibroblasts. Cell Mol Biol Lett 2014; 19:126-39. [PMID: 24569980 PMCID: PMC6276007 DOI: 10.2478/s11658-014-0186-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2013] [Accepted: 02/18/2014] [Indexed: 02/01/2023] Open
Abstract
Periodontitis is an infectious disease caused by microorganisms present in dental bacterial plaque. Lipoteichoic acid (LTA) is a component of the external membrane of Gram-positive bacteria. It causes septic shock. Ingested flavonoids have been reported to directly affect the regulation of cyclooxygenase-2 (COX-2) expression induced by bacterial toxins. In this study, we examined the effects of four flavonoids (luteolin, fisetin, morin and myricetin) on the activation of ERK1/2, p38 and AKT, and on the synthesis of COX-2 in human gingival fibroblasts treated with LTA from Streptococcus sanguinis. We found that luteolin and myricetin blocked AKT and p38 activation and that myricetin blocked LTA-induced COX-2 expression. The results of our study are important for elucidating the mechanism of action of flavonoid regulation of inflammatory responses.
Collapse
Affiliation(s)
- Gloria Gutiérrez-Venegas
- Laboratorio de Bioquímica, División de Estudios de Posgrado e Investigación, Facultad de Odontología, Universidad Nacional Autónoma de México, Ciudad de México, México,
| | | | | | | |
Collapse
|
14
|
Lee SE, Park YS. Gene expression profiling of human umbilical vein endothelial cells exposed to myricetin. BIOCHIP JOURNAL 2013. [DOI: 10.1007/s13206-013-7404-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
15
|
Zhong S, Kong Y, Zhou L, Zhou C, Zhang X, Wang Y. Efficient conversion of myricetin from Ampelopsis grossedentata extracts and its purification by MIP-SPE. J Chromatogr B Analyt Technol Biomed Life Sci 2013; 945-946:39-45. [PMID: 24321759 DOI: 10.1016/j.jchromb.2013.11.036] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Revised: 11/14/2013] [Accepted: 11/16/2013] [Indexed: 10/26/2022]
Abstract
In this study, we developed an efficient conversion process of dihydromyricetin to myricetin from Ampelopsis grossedentata extracts. The content of myricetin increased from 2.38% to 85.57%, demonstrating the successful dehydrogenation of dihydromyricetin. Molecularly imprinted polymers (MIPs) were prepared by surface imprinting method using silica microspheres as the support matrices and myricetin as template. The MIPs were applied for the selective adsorption of myricetin. The chemical structure of the MIPs was characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. Static, dynamic and selective adsorption experiments showed that the MIPs exhibited good adsorption ability, rather fast template rebinding kinetics, and appreciate selectivity over structurally related compounds. Accordingly, the MIPs were applied as the selective sorbent in SPE to purify myricetin obtained through dehydrogenation, followed by HPLC-UV analysis. The recoveries of myricetin and dihydromyricetin were 92.7% and 55.6%, respectively. This study demonstrates the feasibility of using the developed MIP-SPE method to purify and enrich myricetin in the natural products.
Collapse
Affiliation(s)
- Shian Zhong
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Yanyue Kong
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Ling Zhou
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Chengyun Zhou
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Xiaona Zhang
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Yan Wang
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
| |
Collapse
|
16
|
Abstract
SIGNIFICANCE Diet exerts a major influence on the risk for developing cancer and heart disease. Food factors such as flavonoids are alleged to protect cells from premature aging and disease by shielding DNA, proteins, and lipids from oxidative damage. RECENT ADVANCES Our work has focused on clarifying the effects of dietary components on cancer cell proliferation and tumor growth, discovering mechanisms to explain the effects, and identifying the specific molecular targets of these compounds. Our strategy for identifying specific molecular targets of phytochemicals involves the use of supercomputer technology combined with protein crystallography, molecular biology, and experimental laboratory verification. CRITICAL ISSUES One of the greatest challenges for scientists is to reduce the accumulation of distortion and half truths reported in the popular media regarding the health benefits of certain foods or food supplements. The use of these is not new, but interest has increased dramatically because of perceived health benefits that are presumably acquired without unpleasant side effects. Flavonoids are touted to exert many beneficial effects in vitro. However, whether they can produce these effects in vivo is disputed. FUTURE DIRECTIONS The World Health Organization indicates that one third of all cancer deaths are preventable and that diet is closely linked to prevention. Based on this idea and epidemiological findings, attention has centered on dietary phytochemicals as an effective intervention in cancer development. However, an unequivocal link between diet and cancer has not been established. Thus, identifying cancer preventive dietary agents with specific molecular targets is essential to move forward toward successful cancer prevention.
Collapse
Affiliation(s)
- Ann M Bode
- The Hormel Institute, University of Minnesota, Austin, MN 55912, USA
| | | |
Collapse
|
17
|
Abstract
The major factor in the morbidity and mortality of cancer patients is metastasis. There exists a relative lack of specific therapeutic approaches to control metastasis, and this is a fruitful area for investigation. A healthy diet and lifestyle not only can inhibit tumorigenesis but also can have a major impact on cancer progression and survival. Many chemicals found in edible plants are known to inhibit metastatic progression of cancer. While the mechanisms underlying antimetastatic activity of some phytochemicals are being delineated, the impact of diet, dietary components, and various phytochemicals on metastasis suppressor genes is underexplored. Epigenetic regulation of metastasis suppressor genes promises to be a potentially important mechanism by which dietary components can impact cancer metastasis since many dietary constituents are known to modulate gene expression. The review addresses this area of research as well as the current state of knowledge regarding the impact of diet, dietary components, and phytochemicals on metastasis suppressor genes.
Collapse
|
18
|
Fu RH, Liu SP, Chu CL, Lin YH, Ho YC, Chiu SC, Lin WY, Shyu WC, Lin SZ. Myricetin attenuates lipopolysaccharide-stimulated activation of mouse bone marrow-derived dendritic cells through suppression of IKK/NF-κB and MAPK signalling pathways. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2013; 93:76-84. [PMID: 22689051 DOI: 10.1002/jsfa.5733] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2012] [Revised: 03/30/2012] [Accepted: 04/16/2012] [Indexed: 06/01/2023]
Abstract
BACKGROUND Myricetin is a naturally occurring flavonoid that is found in many fruits, vegetables, teas and medicinal herbs. It has been demonstrated to have anti-inflammatory properties, but, to date, no studies have described the immunomodulatory effects of myricetin on the functions of dendritic cells (DCs). The aim of this study was to evaluate the potential for myricetin to modulate lipopolysaccharide (LPS)-stimulated activation of mouse bone marrow-derived DCs. RESULTS Our experimental data showed that treatment with myricetin up to 10 µg mL(-1) does not cause cytotoxicity in cells. Myricetin significantly decreased the secretion of tumour necrosis factor-α, interleukin-6 and interleukin-12p70 by LPS-stimulated DCs. The expression of LPS-induced major histocompatibility class II, CD40 and CD86 on DCs was also inhibited by myricetin, and the endocytic and migratory capacity of LPS-stimulated DCs was blocked by myricentin. In addition, LPS-stimulated DC-elicited allogeneic T-cell proliferation was reduced by myricetin. Moreover, our results confirmed that myricetin attenuates the responses of LPS-stimulated activation of DCs via suppression of IκB kinase/nuclear factor-κB and mitogen-activated protein kinase-dependent pathways. CONCLUSION Myricetin has novel immunopharmacological activity, and modulation of DCs by myricetin may be an attractive strategy for the treatment of inflammatory and autoimmune disorders, and for transplantation.
Collapse
Affiliation(s)
- Ru-Huei Fu
- Graduate Institute of Immunology, China Medical University, Taichung, Taiwan; Center for Neuropsychiatry, China Medical University Hospital, Taichung, Taiwan
| | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Qin S, Chen J, Tanigawa S, Hou DX. Microarray and pathway analysis highlight Nrf2/ARE-mediated expression profiling by polyphenolic myricetin. Mol Nutr Food Res 2012; 57:435-46. [PMID: 23281314 DOI: 10.1002/mnfr.201200563] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2012] [Revised: 10/16/2012] [Accepted: 10/29/2012] [Indexed: 12/30/2022]
Abstract
SCOPE Myricetin is a dietary flavonol and widely distributed in many edible plants. It has been reported to have many bioactivities and considered as a promising chemopreventive compound. The present study aimed to investigate the influences of myricetin on gene expressions in genome-wide and underlying mechanisms. METHODS AND RESULTS Among total 44K gene probes, myricetin treatment upregulated the signals of 143 gene probes (0.33% of total probes) and downregulated signals of 476 gene probes (1.08% of total probes) by greater than or equal to twofold in HepG2 cells. The network pathway analysis revealed that nuclear factor (erythroid-derived 2)-like 2 (Nrf2)-mediated antioxidant response element (ARE) activation is involved in myricetin-induced genes expressions. Molecular data revealed that myricetin activated Nrf2-ARE pathway by inhibiting Nrf2 ubiquitination and protein turnover, stimulating Nrf2 expression and kelch-like erythroid cell-derived protein with CNC homology (ECH)-associated protein 1 modification. All of these events finally increased nuclear Nrf2 accumulation and ARE-binding activity to enhance ARE-mediated genes expressions. Additionally, treatment with Nrf2 small interfering RNA attenuated the myricetin-induced ARE activity and gene expression. CONCLUSION An Nrf2-mediated ARE activation is involved in myricetin-induced expression profiling in hepatic cells.
Collapse
Affiliation(s)
- Si Qin
- Course of Biological Science and Technology, United Graduate School of Agricultural Sciences, Kagoshima University, Korimoto, Kagoshima, Japan
| | | | | | | |
Collapse
|
20
|
Li Y, Ding Y. Minireview: Therapeutic potential of myricetin in diabetes mellitus. FOOD SCIENCE AND HUMAN WELLNESS 2012. [DOI: 10.1016/j.fshw.2012.08.002] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
21
|
Murakami A, Ohnishi K. Target molecules of food phytochemicals: food science bound for the next dimension. Food Funct 2012; 3:462-76. [PMID: 22377900 DOI: 10.1039/c2fo10274a] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Phytochemicals are generally defined as secondary metabolites in plants that play crucial roles in their adaptation to a variety of environmental stressors. There is a great body of compelling evidence showing that these metabolites have pronounced potentials for regulating and modulating human health and disease onset, as shown by both experimental and epidemiological approaches. Concurrently, enormous efforts have been made to elucidate the mechanism of actions underlying their biological and physiological functions. For example, the pioneering work of Tachibana et al. uncovered the receptor for (-)-epigallocatechin-3-gallate (EGCg) as the 67 kDa laminin receptor, which was shown to partially mediate the functions of EGCg, such as anti-inflammatory, anti-allergic, and anti-proliferative activities. Thereafter, several protein kinases were identified as binding proteins of flavonoids, including myricetin, quercetin, and kaempferol. Isothiocyanates, sulfur-containing phytochemicals present in cruciferous plants, are well known to target Keap1 for activating the transcription factor Nrf2 for inducing self-defensive and anti-oxidative gene expression. In addition, we recently identified CD36 as a cell surface receptor for ursolic acid, a triterpenoid ubiquitously occurring in plants. Importantly, the above mentioned target proteins are indispensable for phytochemicals to exhibit, at least in part, their bioactivities. Nevertheless, it is reasonable to assume that some of the activities and potential toxicities of metabolites are exerted via their interactions with unidentified, off-target proteins. This notion may be supported by the fact that even rationally designed drugs occasionally display off-target effects and induce unexpected outcomes, including toxicity. Here we update the current status and future directions of research related to target molecules of food phytochemicals.
Collapse
Affiliation(s)
- Akira Murakami
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan.
| | | |
Collapse
|
22
|
Kang NJ, Jung SK, Lee KW, Lee HJ. Myricetin is a potent chemopreventive phytochemical in skin carcinogenesis. Ann N Y Acad Sci 2011; 1229:124-32. [PMID: 21793847 DOI: 10.1111/j.1749-6632.2011.06122.x] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Myricetin is a widely distributed flavonol that is found in many plants, including tea, berries, fruits, vegetables, and medicinal herbs. Abundant sources provide interesting insights into the multiple mechanisms by which myricetin mediates chemopreventive effects on skin cancer. Myricetin strongly inhibited tumor promoter-induced neoplastic cell transformation by inhibiting MEK, JAK1, Akt, and MKK4 kinase activity directly. In a mouse skin model, myricetin attenuated the ultraviolet B (UVB)-induced COX-2 expression and skin tumor formation by regulating Fyn. Myricetin-mediated inactivation of Akt in the UVB response plays a role in regulating UVB-induced carcinogenesis. Recently, myricetin was found to inhibit UVB-induced angiogenesis by targeting PI3-K in an SKH-1 hairless mouse skin tumorigenesis model. Raf kinase is a critical target for myricetin in inhibiting the UVB-induced formation of wrinkles and suppression of type I procollagen and collagen levels in mouse skin. Accumulated data suggest that myricetin acts as a promising agent for the chemoprevention of skin cancer.
Collapse
Affiliation(s)
- Nam Joo Kang
- School of Food Science and Biotechnology, Kyungpook National University, Daegu, Republic of Korea
| | | | | | | |
Collapse
|
23
|
Brandt B, Abou-Eladab EF, Tiedge M, Walzel H. Role of the JNK/c-Jun/AP-1 signaling pathway in galectin-1-induced T-cell death. Cell Death Dis 2011; 1:e23. [PMID: 21364631 PMCID: PMC3032336 DOI: 10.1038/cddis.2010.1] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Galectin-1 (gal-1), an endogenous β-galactoside-binding protein, triggers T-cell death through several mechanisms including the death receptor and the mitochondrial apoptotic pathway. In this study we first show that gal-1 initiates the activation of c-Jun N-terminal kinase (JNK), mitogen-activated protein kinase kinase 4 (MKK4), and MKK7 as upstream JNK activators in Jurkat T cells. Inhibition of JNK activation with sphingomyelinase inhibitors (20 μM desipramine, 20 μM imipramine), with the protein kinase C-δ (PKCδ) inhibitor rottlerin (10 μM), and with the specific PKCθ pseudosubstrate inhibitor (30 μM) indicates that ceramide and phosphorylation by PKCδ and PKCθ mediate gal-1-induced JNK activation. Downstream of JNK, we observed increased phosphorylation of c-Jun, enhanced activating protein-1 (AP-1) luciferase reporter, and AP-1/DNA-binding in response to gal-1. The pivotal role of the JNK/c-Jun/AP-1 pathway for gal-1-induced apoptosis was documented by reduction of DNA fragmentation after inhibition JNK by SP600125 (20 μM) or inhibition of AP-1 activation by curcumin (2 μM). Gal-1 failed to induce AP-1 activation and DNA fragmentation in CD3-deficient Jurkat 31-13 cells. In Jurkat E6.1 cells gal-1 induced a proapoptotic signal pattern as indicated by decreased antiapoptotic Bcl-2 expression, induction of proapoptotic Bad, and increased Bcl-2 phosphorylation. The results provide evidence that the JNK/c-Jun/AP-1 pathway plays a key role for T-cell death regulation in response to gal-1 stimulation.
Collapse
Affiliation(s)
- B Brandt
- Medical Faculty, Department of Medical Biochemistry and Molecular Biology, University of Rostock, Rostock, Germany
| | | | | | | |
Collapse
|
24
|
Kim JE, Son JE, Jang YJ, Lee DE, Kang NJ, Jung SK, Heo YS, Lee KW, Lee HJ. Luteolin, a novel natural inhibitor of tumor progression locus 2 serine/threonine kinase, inhibits tumor necrosis factor-alpha-induced cyclooxygenase-2 expression in JB6 mouse epidermis cells. J Pharmacol Exp Ther 2011; 338:1013-22. [PMID: 21705614 DOI: 10.1124/jpet.111.179200] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Targeting tumor necrosis factor (TNF)-α-mediated signal pathways may be a promising strategy for developing chemopreventive agents, because TNF-α-mediated cyclooxygenase (COX)-2 expression plays a key role in inflammation and carcinogenesis. Luteolin [2-(3,4-dihydroxyphenyl)-5,7-dihydroxy-4-chromenone] exerts anticarcinogenic effects, although little is known about the underlying molecular mechanisms and specific targets of this compound. In the present study, we found that luteolin inhibited TNF-α-induced COX-2 expression by down-regulating the transactivation of nuclear factor-κB and activator protein-1. Furthermore, luteolin inhibited TNF-α-induced phosphorylation of mitogen-activated protein kinase/extracellular signal-regulated kinase (ERK) kinase 1/ERK/p90(RSK), mitogen-activated protein kinase kinase 4/c-Jun N-terminal kinase/c-Jun, and Akt/p70(S6K). However, it had no effect on the phosphorylation of p38. These effects of luteolin on TNF-α-mediated signaling pathways and COX-2 expression are similar to those achieved by blocking tumor progression locus 2 serine/threonine kinase (TPL2) using pharmacologic inhibitors and small interfering RNAs. Luteolin inhibited TPL2 activity in vitro and in TPL2 immunoprecipitation kinase assays by binding directly in an ATP-competitive manner. Overall, these results indicate that luteolin exerts potent chemopreventive activities, which primarily target TPL2.
Collapse
Affiliation(s)
- Jong-Eun Kim
- World Class University Biomodulation Program, Department of Agricultural Biotechnology, Center for Agricultural Biomaterials and Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea
| | | | | | | | | | | | | | | | | |
Collapse
|
25
|
Zhang K, Ma Z, Wang J, Xie A, Xie J. Myricetin attenuated MPP(+)-induced cytotoxicity by anti-oxidation and inhibition of MKK4 and JNK activation in MES23.5 cells. Neuropharmacology 2011; 61:329-35. [PMID: 21549720 DOI: 10.1016/j.neuropharm.2011.04.021] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2010] [Revised: 04/06/2011] [Accepted: 04/12/2011] [Indexed: 11/19/2022]
Abstract
Increasing evidence suggests that oxidative stress may be implicated in the degeneration of dopaminergic neurons in Parkinson's disease (PD), and anti-oxidation have been shown to be effective to PD treatment. Myricetin has been reported to have the biological functions of anti-oxidation, anti-apoptosis, anti-inflammation and iron-chelation. The aim of the present study is to investigate the neuroprotective effect of myricetin on 1-methyl-4-phenylpyridinium (MPP(+))-treated MES23.5 cells and the underlying mechanisms. The results showed that myricetin treatment significantly attenuated MPP(+)-induced cell loss and nuclear condensation. Further experiments demonstrated that myricetin could suppress the production of intracellular reactive oxygen species (ROS), restore the mitochondrial transmembrane potential (▵Ψm), increase Bcl-2/Bax ratio and decrease caspase-3 activation that induced by MPP(+). Futhermore, we also showed myricetin decreased the phosphorylation of mitogen-activated protein kinase (MAPK) kinase 4 (MKK4) and c-Jun N-terminal kinase (JNK) caused by MPP(+). These results suggest that myricetin protected the MPP(+)-treated MES23.5 cells by anti-oxidation and inhibition of MKK4 and JNK activation.
Collapse
Affiliation(s)
- Kai Zhang
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders and State Key Disciplines: Physiology, Medical College of Qingdao University, Qingdao 266071, China
| | | | | | | | | |
Collapse
|
26
|
Abstract
Although successful for a limited number of tumour types, the efficacy of cancer therapies, especially for late-stage disease, remains poor overall. Many have argued that this could be avoided by focusing on cancer prevention, which has now entered the arena of targeted therapies. During the process of identifying preventive agents, dietary phytochemicals, which are thought to be safe for human use, have emerged as modulators of key cellular signalling pathways. The task now is to understand how these chemicals perturb these pathways by modelling their interactions with their target proteins.
Collapse
Affiliation(s)
- Ki Won Lee
- Department of Bioscience and Biotechnology, Konkuk University, Seoul 143701, Republic of Korea
| | | | | |
Collapse
|
27
|
Kang NJ, Shin SH, Lee HJ, Lee KW. Polyphenols as small molecular inhibitors of signaling cascades in carcinogenesis. Pharmacol Ther 2011; 130:310-24. [PMID: 21356239 DOI: 10.1016/j.pharmthera.2011.02.004] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2011] [Accepted: 02/02/2011] [Indexed: 12/16/2022]
Abstract
Multiple lines of evidences suggest that oxidative stress induced by reactive oxygen species are closely related to multi-stage carcinogenesis. Polyphenols, a group of chemicals with more than one phenol unit or building block per molecule, have been recognized for possessing many health benefits including cancer-preventive effects mainly due to their antioxidant activity. However, polyphenols can directly bind with signaling molecules involved in carcinogenesis and regulate its activity. Moreover, it is noteworthy that the binding between the polyphenol and the target protein is determined by their structural relationship, which implies that different polyphenols have different target proteins, leading to divergent chemopreventive effects. Extracellular stimuli transmit signals into a cell by activating their target signaling cascades involved in carcinogenesis. As an example, Src family kinase, a family of proto-oncogenic tyrosine kinases activated by a variety of oxidative stress and proinflammatory agents, is known to regulate cell proliferation, differentiation, survival and angiogenesis. Src family kinase subsequently activates downstream signal cascades including mitogen-activated protein kinase, phosphoinositol-3-kinase, and nuclear factor-kappaB, thereby inducing cell proliferation and causing cancer. Recent studies demonstrate that polyphenols can directly target signaling cascades involved in inflammation and the development of cancer. Inhibition of the kinases by polyphenols contributes to the attenuation of carcinogenesis. Therefore, the development of polyphenols as direct inhibitors against target proteins is regarded as a rational approach for chemoprevention. This review describes and discusses recent results about the direct interactions of polyphenols and protein kinases in cancer chemoprevention.
Collapse
Affiliation(s)
- Nam Joo Kang
- School of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | | | | | | |
Collapse
|
28
|
Hou DX, Kumamoto T. Flavonoids as protein kinase inhibitors for cancer chemoprevention: direct binding and molecular modeling. Antioxid Redox Signal 2010; 13:691-719. [PMID: 20070239 DOI: 10.1089/ars.2009.2816] [Citation(s) in RCA: 133] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Protein kinases play crucial roles in the regulation of multiple cell signaling pathways and cellular functions. Deregulation of protein kinase function has been implicated in carcinogenesis. The inhibition of protein kinases has emerged as an important target for cancer chemoprevention and therapy. Accumulated data revealed that flavonoids exert chemopreventive effects through acting at protein kinase signaling pathways, more than as conventional hydrogen-donating antioxidants. Recent studies show that flavonoids can bind directly to some protein kinases, including Akt/protein kinase B (Akt/PKB), Fyn, Janus kinase 1 (JAK1), mitogen-activated protein kinase kinase 1 (MEK1), phosphoinositide 3-kinase (PI3K), mitogen-activated protein (MAP) kinase kinase 4 (MKK4), Raf1, and zeta chain-associated 70-kDa protein (ZAP-70) kinase, and then alter their phosphorylation state to regulate multiple cell signaling pathways in carcinogenesis processes. In this review, we report recent results on the interactions of flavonoids and protein kinases, especially their direct binding and molecular modeling. The data suggest that flavonoids act as protein kinase inhibitors for cancer chemoprevention that were thought previously as conventional hydrogen-donating antioxidant. Moreover, the molecular modeling data show some hints for creating natural compound-based protein kinase inhibitors for cancer chemoprevention and therapy.
Collapse
Affiliation(s)
- De-Xing Hou
- The United Graduate School of Agricultural Sciences, Faculty of Agriculture, Kagoshima University, Kagoshima City, Japan
| | | |
Collapse
|
29
|
Cocoa polyphenols suppress TNF-α-induced vascular endothelial growth factor expression by inhibiting phosphoinositide 3-kinase (PI3K) and mitogen-activated protein kinase kinase-1 (MEK1) activities in mouse epidermal cells. Br J Nutr 2010; 104:957-64. [PMID: 20550744 DOI: 10.1017/s0007114510001704] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Cocoa polyphenols have antioxidant and anti-inflammatory effects. TNF-α is a pro-inflammatory cytokine that has a vital role in the pathogenesis of inflammatory diseases such as cancer and psoriasis. Vascular endothelial growth factor (VEGF) expression is associated with tumorigenesis, CVD, rheumatoid arthritis and psoriasis. We tested whether cocoa polyphenol extract (CPE) inhibited TNF-α-induced VEGF expression in promotion-sensitive JB6 mouse epidermal cells. CPE significantly inhibited TNF-α-induced up-regulation of VEGF via reducing TNF-α-induced activation of the nuclear transcription factors activator protein-1 (AP-1) and NF-κB, which are key regulators of VEGF expression. CPE also inhibited TNF-α-induced phosphorylation of protein kinase B (Akt) and extracellular signal-regulated kinase. CPE blocked activation of their downstream kinases, p70 kDa ribosomal protein S6 kinase and p90 kDa ribosomal protein S6 kinase. CPE suppressed phosphoinositide 3-kinase (PI3K) activity via binding PI3K directly. CPE did not affect TNF-α-induced phosphorylation of mitogen-activated protein kinase kinase-1 (MEK1) but suppressed TNF-α-induced MEK1 activity. Collectively, these results indicate that CPE reduced TNF-α-induced up-regulation of VEGF by directly inhibiting PI3K and MEK1 activities, which may contribute to its chemopreventive potential.
Collapse
|
30
|
Kim JY, Lee WK, Yu YG, Kim JH. Blockade of LTB4-induced chemotaxis by bioactive molecules interfering with the BLT2-Galphai interaction. Biochem Pharmacol 2010; 79:1506-15. [PMID: 20097180 DOI: 10.1016/j.bcp.2010.01.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2009] [Revised: 01/12/2010] [Accepted: 01/13/2010] [Indexed: 01/30/2023]
Abstract
BLT2, a low-affinity leukotriene B4 (LTB4) receptor, is a member of the G-protein coupled receptor (GPCR) family and is involved in the pathogenesis of inflammatory diseases such as asthma. Despite its clinical implications, however, no pharmacological inhibitors are available. In the present study, we screened for small molecules that interfere with the interaction between the third intracellular loop region of BLT2 (BLT2iL3) and the Galphai3 protein subunit (Galphai3), using a high-throughput screening (HTS) assay with a library of 1040 FDA-approved drugs and bioactive compounds. We identified two small molecules-purpurin [1,2,4-trihydroxy-9,10-anthraquinone; IC50 = 1.6 microM for BLT2] and chloranil [tetrachloro-1,4-benzoquinone; IC50 = 0.42 microM for BLT2]-as specific BLT2-blocking agents. We found that blockade of the BLT2iL3-Galphai3 interaction by these small molecules inhibited the BLT2-downstream signaling cascade. For example, BLT2-signaling to phosphoinositide-3 kinase (PI3K)/Akt phosphorylation was completely abolished by these molecules. Furthermore, we observed that these small molecules blocked LTB4-induced chemotaxis by inhibiting the BLT2-PI3K/Akt-downstream, Rac1-reactive oxygen species-dependent pathway. Taken together, our results show that purpurin and chloranil interfere with the interaction between BLT2iL3 and Galphai3 and thus block the biological functions of BLT2 (e.g., chemotaxis). The present findings suggest a potential application of purpurin and chloranil as pharmacological therapeutic agents against BLT2-associated inflammatory human diseases.
Collapse
|
31
|
Cyanidin suppresses ultraviolet B-induced COX-2 expression in epidermal cells by targeting MKK4, MEK1, and Raf-1. Biochem Pharmacol 2010; 79:1473-82. [DOI: 10.1016/j.bcp.2010.01.008] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2009] [Revised: 01/08/2010] [Accepted: 01/12/2010] [Indexed: 11/18/2022]
|
32
|
Kim W, Yang HJ, Youn H, Yun YJ, Seong KM, Youn B. Myricetin inhibits Akt survival signaling and induces Bad-mediated apoptosis in a low dose ultraviolet (UV)-B-irradiated HaCaT human immortalized keratinocytes. JOURNAL OF RADIATION RESEARCH 2010; 51:285-296. [PMID: 20339252 DOI: 10.1269/jrr.09141] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Deregulation of cell survival pathways and resistance to apoptosis are generally accepted as crucial aspects of tumorigenesis. As in many tumors, increasing occurrence of human skin cancer and other conflicting effects of solar ultraviolet (UV) radiation enhance the demand for novel chemoprevention agents. Myricetin, a naturally occurring phytochemical, is potent in anti-cancer promoting activity and affords to the chemopreventive potential of several healthy-foods, including fruits and vegetables. We demonstrate here that myricetin inhibits Akt activity to induce apoptosis in a low dose ('repairable dose') UVB-irradiated keratinocytes. Treatment of UVB-irradiated HaCaT cells with an apoptosis-inducing concentration of myricetin (20 microM) resulted in a decrease in phosphorylation of Akt leading to inhibition of its kinase activity. Myricetin treatment also caused a decrease in phosphorylation of Bad (a pro-apoptotic protein), a direct target of Akt in signaling pathway. Interaction between Bad and 14-3-3beta was reduced markedly in UVB-irradiated cells upon a treatment with myricetin. Comparable to these results, myricetin treatment promoted mitochondrial translocation of Bad, loss of the mitochondrial membrane potential, and release of the mitochondrial apoptotic proteins including cytochrome c, Smac, and AIF. Ectopic expression of constitutively active Akt granted statistically significant protection against myricetin-induced apoptosis. In addition, myricetin-induced apoptosis in UVB-irradiated cells was notably attenuated in the presence of caspase inhibitors. Together, these results indicate that myricetin might take on potent chemopreventive activity by inhibiting the Akt-mediated survival signaling axis in UVB-induced skin carcinogenesis.
Collapse
Affiliation(s)
- Wanyeon Kim
- College of Natural Sciences, Department of Biological Sciences, Pusan National University, Busan, Korea
| | | | | | | | | | | |
Collapse
|
33
|
Choi KH, Kim JE, Song NR, Son JE, Hwang MK, Byun S, Kim JH, Lee KW, Lee HJ. Phosphoinositide 3-kinase is a novel target of piceatannol for inhibiting PDGF-BB-induced proliferation and migration in human aortic smooth muscle cells. Cardiovasc Res 2009; 85:836-44. [PMID: 19887493 DOI: 10.1093/cvr/cvp359] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
AIMS Abnormal migration and proliferation of human aortic smooth muscle cells (HASMCs) to the intima causes intimal thickening of the aorta, which is strongly related to the development of atherosclerosis. Previous studies have suggested that red wine polyphenols, particularly resveratrol, have great protective effects against cardiovascular diseases. Here, we compared the anti-atherosclerotic effect of piceatannol, a metabolite of resveratrol, and its underlying mechanisms. METHODS AND RESULTS We demonstrated that piceatannol inhibited platelet-derived growth factor (PDGF)-BB-induced cell migration using a modified Boyden chamber assay and wound healing assay. Western blot analysis showed that PDGF-BB-induced phosphorylation of Akt, p70S6K, and p38 was inhibited by piceatannol, but not resveratrol. In vitro and ex vivo phosphoinositide 3-kinase (PI3K) assays demonstrated that piceatannol suppressed PI3K activity more effectively than resveratrol. PDGF-BB-induced migration and proliferation of HASMCs were inhibited by treatment with a commercial PI3K inhibitor, LY294002. Both in vitro and ex vivo pull-down assays revealed that piceatannol directly binds with sepharose 4B-PI3K beads in an ATP-competitive manner. CONCLUSION The results of the present study demonstrate that piceatannol directly binds with PI3K in an ATP-competitive manner and suppresses PI3K activity with anti-atherosclerotic effects.
Collapse
Affiliation(s)
- Keun Hwa Choi
- Department of Agricultural Biotechnology, Seoul National University, Seoul 151-921, Republic of Korea
| | | | | | | | | | | | | | | | | |
Collapse
|
34
|
Kwon JY, Lee KW, Kim JE, Jung SK, Kang NJ, Hwang MK, Heo YS, Bode AM, Dong Z, Lee HJ. Delphinidin suppresses ultraviolet B-induced cyclooxygenases-2 expression through inhibition of MAPKK4 and PI-3 kinase. Carcinogenesis 2009; 30:1932-40. [PMID: 19776176 DOI: 10.1093/carcin/bgp216] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Cyclooxygenase-2 (COX-2), a key mediator of inflammation, and its product, prostaglandin E(2) (PGE(2)), enhance carcinogenesis, particularly in skin. Ultraviolet (UV) B is the most carcinogenic component of solar irradiation, and a crucial role of COX-2 in UVB-mediated skin carcinogenesis has been reported. Here, we investigated the effects of delphinidin, an abundant dietary anthocyanin, on UVB-induced COX-2 upregulation and the underlying molecular mechanism. We found that delphinidin suppressed UVB-induced COX-2 expression in JB6 P+ mouse epidermal cells. COX-2 promoter activity and PGE(2) production were also suppressed by delphinidin treatment within non-cytotoxic concentrations. Activator protein-1 and nuclear factor-kappaB, crucial transcription factors involved in COX-2 expression, were activated by UVB and delphinidin abolished this activation. UVB-induced phosphorylation of c-Jun N-terminal kinase, p38 kinase and Akt was inhibited by delphinidin. The activities of mitogen-activated protein kinase kinase (MAPKK) 4 and phosphatidylinositol-3 kinase (PI-3K) were inhibited markedly by delphinidin. A pull-down assay using delphinidin-Sepharose beads revealed that delphinidin binds directly with MAPKK4 or PI-3K in a manner that was competitive with adenosine triphosphate. Moreover, in vivo investigations using mouse skin revealed that the upregulation of COX-2 expression, MAPKK4 activity and PI-3K activity induced by UVB was abolished with delphinidin treatment. Collectively, our results demonstrated that delphinidin targets MAPKK4 and PI-3K directly to suppress COX-2 overexpression, suggesting a potential protective role for delphinidin against UVB-mediated skin carcinogenesis.
Collapse
Affiliation(s)
- Jung Yeon Kwon
- Major in Biomodulation, Department of Agricultural Biotechnology, Seoul National University, Seoul 151-742, Republic of Korea
| | | | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Arginine deiminase originating from Lactococcus lactis ssp. lactis American Type Culture Collection (ATCC) 7962 induces G1-phase cell-cycle arrest and apoptosis in SNU-1 stomach adenocarcinoma cells. Br J Nutr 2009; 102:1469-76. [PMID: 19624867 DOI: 10.1017/s0007114509990432] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
There are multiple lines of evidence that lactic acid bacteria (LAB) exert cancer-preventive effects. However, the underlying mechanisms are poorly understood. In the present study we found that the cytoplasmic fraction of Lactococcus lactis ssp. lactis American Type Culture Collection (ATCC) 7962 exerted the strongest antiproliferative effects (half-maximal inhibitory concentration (IC50) = 17 microg/ml) in SNU-1 human stomach cancer cells and arginine deiminase (ADI; EC 3.5.3.6) activity. We also cloned, expressed and purified ADI from L. lactis ssp. lactis ATCC 7962 (LADI). Both purified ADI from L. lactis (PADI; IC50 = 2 microg/ml) and recombinant ADI originating from LADI (IC50 = 0.6 microg/ml) inhibited the proliferation of SNU-1 cells. LADI induced G0/G1-phase arrest, sub-G1 accumulation, DNA condensation and DNA fragmentation in SNU-1 cells. 4',6-Diamidino-2-phenylindole (DAPI) staining and DNA fragmentation data provide evidence that LADI induces apoptosis in SNU-1 cells. LADI increased the expressions of p53 and p27Kip1, and decreased the expressions of cyclin D1, c-myc and Bcl-xL in SNU-1 cells. However, LADI had no effects on the expressions of p21Cip1 and Bcl-2. Collectively, these data indicate that ADI induces apoptosis and G0/G1-phase arrest of SNU-1 cells, which might contribute to the chemopreventive potential of LAB.
Collapse
|
36
|
Akt is a direct target for myricetin to inhibit cell transformation. Mol Cell Biochem 2009; 332:33-41. [PMID: 19504174 DOI: 10.1007/s11010-009-0171-9] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2009] [Accepted: 05/21/2009] [Indexed: 10/20/2022]
Abstract
Akt, a serine/threonine kinase, is a critical regulator in many cellular processes including cell growth, proliferation, and apoptosis. In this study, we found that myricetin, a typical flavonol existing in many fruits and vegetables, could directly target Akt to inhibit cell transformation. Binding assay revealed that myricetin bound to Akt directly by competing with ATP. In vitro and ex vivo data confirmed that myricetin inhibited the phosphorylation and kinase activity of Akt. Molecular modeling suggested that myricetin easily docks to the ATP-binding site of Akt with hydrogen bonds. Signaling analysis data further demonstrated that myricetin inhibited Akt-mediated activator protein-1 (AP-1) transactivation, cyclin D1 expression and cell transformation. Overall, our results indicate that Akt is a direct target for myricetin to inhibit cell transformation.
Collapse
|