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The neuroprotective effect of walnut-derived peptides against glutamate-induced damage in PC12 cells: mechanism and bioavailability. FOOD SCIENCE AND HUMAN WELLNESS 2022. [DOI: 10.1016/j.fshw.2022.03.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Oliveira AI, Pinho C, Sarmento B, Dias ACP. Quercetin-biapigenin nanoparticles are effective to penetrate the blood-brain barrier. Drug Deliv Transl Res 2022; 12:267-281. [PMID: 33709285 DOI: 10.1007/s13346-021-00917-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/18/2021] [Indexed: 01/16/2023]
Abstract
Search for efficient therapeutic agents for central nervous system (CNS) disorders has been extensive. Nevertheless, blood-brain barrier (BBB) is an obstacle that prevents the majority of compounds to act in these diseases. It is, thus, of extreme relevance the BBB overcome, in order to deliver a drugs therapeutically active concentration to the action site, with the least losses and interaction with other organs, tissues, or cells. The present study aimed to investigate the potential protective effect of quercetin-biapigenin encapsulated into poly(Ɛ-polycaprolactone) (PCL) nanoparticles against t-BOOH-induced oxidative stress in several brain cell lines, as well as evaluate the permeability of those active molecules through an in vitro BBB model. The three cell lines under study (BV-2, hcmec/D3, and U87) presented different reactions to t-BOOH. In general, quercetin-biapigenin PCL-loaded nanoparticles were able to minimize compound toxicity they convey, regardless the cell line. Quercetin-biapigenin PCL-loaded nanoparticles (Papp of approximately 80 × 10-6 cm/s) revealed to be more permeable than free compounds (Papp of approximately 50 × 10-6 cm/s). As of our knowledge, this is the first report of quercetin-biapigenin PCL-loaded nanoparticle activity in brain cells. It is also the first determining its permeability through BBB, as an effective nanocarrier for brain delivery.
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Affiliation(s)
- Ana Isabel Oliveira
- Centro de Investigação Em Saúde E Ambiente (CISA), Escola Superior de Saúde -Politécnico do Porto (ESS-P.Porto), 4000-072, Porto, Portugal.
| | - Cláudia Pinho
- Centro de Investigação Em Saúde E Ambiente (CISA), Escola Superior de Saúde -Politécnico do Porto (ESS-P.Porto), 4000-072, Porto, Portugal
| | - Bruno Sarmento
- i3S - Instituto de Investigação E Inovação Em Saúde, Universidade Do Porto, Rua Alfredo Allen 208, 4200-135, Porto, Portugal
- INEB - Instituto Nacional de Engenharia Biomédica, Universidade Do Porto, Rua Alfredo Allen 208, 4200-135, Porto, Portugal
- CESPU, Instituto de Investigação E Formação Avançada Em Ciências E Tecnologias da Saúde, Instituto Universitário de Ciências da Saúde, 4585-116, Gandra, Portugal
| | - Alberto C P Dias
- Centre of Molecular and Environmental Biology (CBMA), Biology Department, Department of Biology, University of Minho, 4710-057, Braga, Portugal
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Arai N, Koishi T, Ebisuzaki T. Nanotube Active Water Pump Driven by Alternating Hydrophobicity. ACS NANO 2021; 15:2481-2489. [PMID: 33534546 DOI: 10.1021/acsnano.0c06493] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Water transport must be efficiency controlled for the future sustainability of life. Various water transport systems using carbon nanotubes have been proposed in recent years. Although these systems are more permeable than aquaporins, their water transport is passive. In this study, we successfully demonstrate an active water pump driven by simple hydrophobic interaction through computer simulation. Even in the absence of a pressure- or density-gradient, the proposed pump can actively transport water molecules by alternately switching the hydrophobicity of the pump surface. The water transport rate can be easily controlled by varying the time interval of switching. The pump with optimized switching time exhibits prominent water permeance. The results obtained herein can be applied in various water transport technologies because of the simple mechanics. The proposed water pump has the potential to realize an effective device such as a low-energy artificial purification system.
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Affiliation(s)
- Noriyoshi Arai
- Department of Mechanical Engineering, Keio University, Yokohama 223-8522, Japan
- Computational Astrophysics Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
| | - Takahiro Koishi
- Department of Applied Physics, University of Fukui, Bunkyo, Fukui 910-8507, Japan
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Antioxidant, anti-inflammatory and neuroprotective effect of kaempferol on rotenone-induced Parkinson’s disease model of rats and SH-S5Y5 cells by preventing loss of tyrosine hydroxylase. J Funct Foods 2020. [DOI: 10.1016/j.jff.2020.104140] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
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Rostami Dehmoradkhani K, Jafari A, Shokoohinia Y, Emami SA, Mojarrab M. Flavonoids from the Aerial Parts of Artemisia biennis Willd. PHARMACEUTICAL SCIENCES 2019. [DOI: 10.15171/ps.2019.33] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Background: The current phytochemical study was carried out on a fraction of dried polar extract of aerial parts of Artemisia biennis Willd. which was previously reported to decrease the viability of the rat pheochromocytoma cell line PC12 in cell-based antioxidant assays. Methods: A combination of solid phase extraction (SPE) and high pressure liquid chromatography (HPLC) of the hydroethanolic extract was used to purify the compounds. Structures of the isolated compounds were elucidated by spectroscopic means, including 1H-NMR and MS analyses. Results: Three isolated and identified flavonoids in this study were luteolin, kaempferol and apigenin. Conclusion: The cytotoxic potential of flavone aglycones, as the major components of selected fraction in the hydroethanolic extract of A. biennis might partly be related to the high death rate of PC12 cells.
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Affiliation(s)
| | - Azizollah Jafari
- Department of Biology, Faculty of Sciences, University of Yasouj, Yasouj, Iran
| | - Yalda Shokoohinia
- Pharrmaceutical Sciences Research Center, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Seyed Ahmad Emami
- Department of Pharmacognosy, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mahdi Mojarrab
- Pharrmaceutical Sciences Research Center, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
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6
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Wang S, Su G, Zhang Q, Zhao T, Liu Y, Zheng L, Zhao M. Walnut ( Juglans regia) Peptides Reverse Sleep Deprivation-Induced Memory Impairment in Rat via Alleviating Oxidative Stress. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:10617-10627. [PMID: 30226056 DOI: 10.1021/acs.jafc.8b03884] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The aim of this study was to determine the neuroprotective effects of walnut protein hydrolysates (WPH) against memory deficits induced by sleep deprivation (SD) in rat and further to identify and characterize the potent neuroprotective peptides against glutamate-induced apoptosis in PC12 cells. Results showed that a remarkable amelioration effect on behavioral performance in Morris water maze test was observed for WPH and its low molecular weight fraction WPHL, especially for WPHL. Additionally, a reduction of antioxidant defense (catalase, glutathione peroxidase (GSH-px), and superoxide dismutase (SOD)) and an increase of malondialdehyde content induced by SD were normalized in brain of rat after oral administration of WPH and WPHL. Then three neuroprotective peptides including GGW, VYY, and LLPF were identified from WPHL, which could protect PC12 cells against glutamate-induced apoptosis with relative cell viability of 78.29 ± 3.09%, 80.65 ± 1.74%, and 83.97 ± 3.06%, respectively, versus glutamate group 48.61 ± 3.99%. The possible mechanism underlying their protective effects of GGW and VYY could be related to their strong radical scavenging activity as well as their ability to reduce reactive oxygen species production and the depletion of SOD and GSH-px in PC12 cells. Notably, the marked neuroprotective effects of LLPF, which did not show obvious free-radical scavenging activity in vitro, could be attributed to its strong effects on inhibiting Ca2+ influx and mitochondrial membrane potential collapse. Additionally, all these peptides could regulate the expression of apoptosis-related proteins (Bax and Bcl-2). Therefore, walnut peptides might be regarded as the potential nutraceuticals against neurodegenerative disorders associated with memory deficits.
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Affiliation(s)
- Shuguang Wang
- School of Food Science and Engineering , South China University of Technology , Guangzhou 510640 , China
- Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center , Guangzhou 510650 , China
| | - Guowan Su
- School of Food Science and Engineering , South China University of Technology , Guangzhou 510640 , China
- Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center , Guangzhou 510650 , China
| | - Qi Zhang
- School of Food Science and Engineering , South China University of Technology , Guangzhou 510640 , China
- Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center , Guangzhou 510650 , China
| | - Tiantian Zhao
- School of Food Science and Engineering , South China University of Technology , Guangzhou 510640 , China
- Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center , Guangzhou 510650 , China
| | - Yang Liu
- School of Food Science and Engineering , South China University of Technology , Guangzhou 510640 , China
- Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center , Guangzhou 510650 , China
| | - Lin Zheng
- School of Food Science and Engineering , South China University of Technology , Guangzhou 510640 , China
| | - Mouming Zhao
- School of Food Science and Engineering , South China University of Technology , Guangzhou 510640 , China
- Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center , Guangzhou 510650 , China
- Beijing Advanced Innovation Center for Food Nutrition and Human Health , Beijing Technology & Business University , Beijing 100048 , China
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An overview of the possible therapeutic role of SUMOylation in the treatment of Alzheimer’s disease. Pharmacol Res 2018; 130:420-437. [DOI: 10.1016/j.phrs.2017.12.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 12/13/2017] [Accepted: 12/21/2017] [Indexed: 02/07/2023]
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Zhao T, Su G, Wang S, Zhang Q, Zhang J, Zheng L, Sun B, Zhao M. Neuroprotective Effects of Acetylcholinesterase Inhibitory Peptides from Anchovy (Coilia mystus) against Glutamate-Induced Toxicity in PC12 Cells. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:11192-11201. [PMID: 29190426 DOI: 10.1021/acs.jafc.7b03945] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Ameliorations of cholinergic system dysfunction and oxidative stress in neurodegenerative diseases were main approaches to improve memory disorder. Our previous investigation showed that anchovy protein hydrolysate (APH) could attenuate scopolamine-induced memory deficits in mice by regulating acetylcholinesterase (AChE) activity. Therefore, peptides with AChE inhibitory activity in APH were explored and identified in this study, and their possible neuroprotective mechanisms on glutamate induced apoptosis in PC12 were also elucidated. Two peptides with strong AChE inhibitory capacity were identified as Pro-Ala-Tyr-Cys-Ser (PAYCS) and Cys-Val-Gly-Ser-Tyr (CVGSY) by ultraperformance liquid chromatography coupled with tandem mass spectrometry. The AChE inhibitory was 23.68 ± 0.97% and 6.08 ± 0.41%, respectively. Treatment with PAYCS and CVGSY could significantly (p < 0.05) increase cells viability, reduce lactate dehydrogenase release, reactive oxygen species (ROS) production, malondialdehyde content, and the ratio of Bax/Bcl-2 of glutamate-induced apoptosis PC12 cells (82.78 ± 6.58 and 109.94 ± 7.16% of control, respectively) as well as increase superoxide dismutase and GSH-px activities. In addition, both the peptides could inhibit Ca2+ influx but have no effects on mitochondrial membrane potential. Results indicated that AChE inhibitory peptides (PAYCS and CVGSY) possibly protected the PC12 cells against glutamate-induced apoptosis via inhibiting ROS production and Ca2+ influx. PAYCS and CVGSY might be considered as nutraceuticals for alleviating memory deficits.
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Affiliation(s)
- Tiantian Zhao
- School of Food Science and Engineering, South China University of Technology , Guangzhou 510640, China
- Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center, Guangzhou 510650, China
| | - Guowan Su
- School of Food Science and Engineering, South China University of Technology , Guangzhou 510640, China
- Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center, Guangzhou 510650, China
| | - Shuguang Wang
- School of Food Science and Engineering, South China University of Technology , Guangzhou 510640, China
- Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center, Guangzhou 510650, China
| | - Qi Zhang
- School of Food Science and Engineering, South China University of Technology , Guangzhou 510640, China
- Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center, Guangzhou 510650, China
| | - Jianan Zhang
- School of Food Science and Engineering, South China University of Technology , Guangzhou 510640, China
- Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center, Guangzhou 510650, China
| | - Lin Zheng
- School of Food Science and Engineering, South China University of Technology , Guangzhou 510640, China
- Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center, Guangzhou 510650, China
| | - Baoguo Sun
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology & Business University (BTBU) , Beijing 100048, China
| | - Mouming Zhao
- School of Food Science and Engineering, South China University of Technology , Guangzhou 510640, China
- Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center, Guangzhou 510650, China
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology & Business University (BTBU) , Beijing 100048, China
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Hu Q, Wang D, Yu J, Ma G, Pei F, Yang W. Neuroprotective effects of six components from Flammulina velutipes on H2O2-induced oxidative damage in PC12 cells. J Funct Foods 2017. [DOI: 10.1016/j.jff.2017.07.043] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
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10
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Eriodictyol attenuates arsenic trioxide-induced liver injury by activation of Nrf2. Oncotarget 2017; 8:68668-68674. [PMID: 28978146 PMCID: PMC5620286 DOI: 10.18632/oncotarget.19822] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Accepted: 06/28/2017] [Indexed: 11/25/2022] Open
Abstract
Arsenic, a well-known human carcinogen, has been reported to induce hepatic oxidative stress and hepatic injury. Eriodictyol, a flavonoid found in citrus fruits, has been reported to have antioxidant effects. In this study, we aimed to investigate the protective effects of eriodictyol on arsenic trioxide (As2O3)-induced liver injury and to clarify the molecular mechanism. Male Wistar rats were administrated 3mg/kg As2O3 intravenous injection at days 1, 4, 5, and 7. Eriodictyol was given 1 h before or after As2O3 treatment. The results showed that eriodictyol prevented As2O3-induced liver reactive oxygen species (ROS) and malonaldehyde (MDA) levels. Eriodictyol abrogated As2O3-induced decrease of the antioxidant enzymes superoxide dismutase (SOD), glutathione peroxidase (GPX), and catalase (CAT) activity. Eriodictyol also attenuated As2O3-induced hepatic pathological damage. In addition, eriodictyol promoted the expression of nuclear factor erythroid 2 p45 related factor 2 (Nrf2) and heme oxygenase-1 (HO-1) up-regulated by As2O3. In conclusion, our results demonstrated that eriodictyol exhibited a protective effect on As2O3-induced liver injury and the possible mechanism is involved in activating Nrf2 signaling pathway.
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Hu Q, Yu J, Yang W, Kimatu BM, Fang Y, Ma N, Pei F. Identification of flavonoids from Flammulina velutipes and its neuroprotective effect on pheochromocytoma-12 cells. Food Chem 2016; 204:274-282. [DOI: 10.1016/j.foodchem.2016.02.138] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Revised: 02/03/2016] [Accepted: 02/23/2016] [Indexed: 10/22/2022]
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12
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Apigenin Reduces Proteasome Inhibition-Induced Neuronal Apoptosis by Suppressing the Cell Death Process. Neurochem Res 2016; 41:2969-2980. [DOI: 10.1007/s11064-016-2017-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 07/11/2016] [Accepted: 07/26/2016] [Indexed: 11/26/2022]
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13
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Yan H, Wei P, Song J, Jia X, Zhang Z. Enhanced anticancer activity in vitro and in vivo of luteolin incorporated into long-circulating micelles based on DSPE-PEG2000 and TPGS. ACTA ACUST UNITED AC 2016; 68:1290-8. [PMID: 27465923 DOI: 10.1111/jphp.12598] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Accepted: 06/11/2016] [Indexed: 01/01/2023]
Abstract
OBJECTIVES This study aimed to evaluate enhanced anticancer activity in vitro and in vivo of luteolin-loaded long-circulating micelles (DTLLMs) formulated. METHODS DTLLM was the luteolin formulation prepared with 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-methoxy-poly (ethylene glycol 2000) (DSPE-PEG2000 ) and d-α-tocopheryl polyethylene glycol succinate (TPGS) in this study. We performed a systematic comparative evaluation of the antiproliferative effect, cellular uptake, antitumour efficacy and in vivo tumour targeting of these micelles using non-small cell lung cancer (NSCLC) A549 cells. KEY FINDINGS Results showed that the obtained micelles have a mean particle size of around 42.34 nm, and the size of micelles was narrowly distributed. With the improved cellular uptake, DTLLM displayed a more potent antiproliferative action on A549 cell lines than luteolin; half-maximal inhibitory concentration (IC50 ) was 7.29 vs 19.14 μg/ml, respectively. The antitumour efficacy test in nude mice showed that DTLLM exhibited significantly higher antitumour activity against NSCLC with lesser toxic effects on normal tissues. The imaging study for in vivo targeting demonstrated that the long-circulating micelles formulation achieved targeted drug delivery and make drug release slow to prolong the circulating time. CONCLUSION DTLLM might be a potential antitumour formulation.
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Affiliation(s)
- Hongmei Yan
- Nanjing University of Chinese Medicine, Nanjing, China.,Third School of Clinical Medical of Nanjing University of Chinese Medicine, Nanjing, China
| | - Pingping Wei
- Department of Pharmacy, Nanjing Hospital, Jiangsu Corps, The Armed Police Force, PLA, Nanjing, China
| | - Jie Song
- Nanjing University of Chinese Medicine, Nanjing, China.,Third School of Clinical Medical of Nanjing University of Chinese Medicine, Nanjing, China
| | - Xiaobin Jia
- Nanjing University of Chinese Medicine, Nanjing, China. .,Third School of Clinical Medical of Nanjing University of Chinese Medicine, Nanjing, China.
| | - Zhenhai Zhang
- Third School of Clinical Medical of Nanjing University of Chinese Medicine, Nanjing, China.
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Chen MM, Yin ZQ, Zhang LY, Liao H. Quercetin promotes neurite growth through enhancing intracellular cAMP level and GAP-43 expression. Chin J Nat Med 2016; 13:667-72. [PMID: 26412426 DOI: 10.1016/s1875-5364(15)30064-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2014] [Indexed: 12/26/2022]
Abstract
The present study was designed to investigate the role of quercetin on neurite growth in N1E-115 cells and the underlying mechanisms. Quercetin was evaluated for its effects on cell numbers of neurites, neurite length, intracellular cAMP content, and Gap-43 expression in N1E-115 cells in vitro by use of microscopy, LANCE(tm) cAMP 384 kit, and Western blot analysis, respectively. Our results showed that quercetin could increase the neurite length in a concentration-dependent manner, but had no effect on the numbers of cells. Quercetin significantly increased the expression of cellular cAMP in a time- and concentration-dependent manner. The Gap-43 expression was up-regulated in a time-dependent manner. In conclusion, quercetin could promote neurite growth through increasing the intracellular cAMP level and Gap-43 expression.
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Affiliation(s)
- Ming-Ming Chen
- National Center for Drug Screening, China Pharmaceutical University, Nanjing 210009, China
| | - Zhi-Qi Yin
- Department of Phytochemistry, China Pharmaceutical University, Nanjing 210009, China
| | - Lu-Yong Zhang
- National Center for Drug Screening, China Pharmaceutical University, Nanjing 210009, China.
| | - Hong Liao
- National Center for Drug Screening, China Pharmaceutical University, Nanjing 210009, China.
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Ben Salem I, Prola A, Boussabbeh M, Guilbert A, Bacha H, Lemaire C, Abid-Essefi S. Activation of ER stress and apoptosis by α- and β-zearalenol in HCT116 cells, protective role of Quercetin. Neurotoxicology 2016; 53:334-342. [DOI: 10.1016/j.neuro.2015.11.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Accepted: 11/09/2015] [Indexed: 01/14/2023]
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Oliveira AI, Pinho C, Sarmento B, Dias ACP. Neuroprotective Activity of Hypericum perforatum and Its Major Components. FRONTIERS IN PLANT SCIENCE 2016; 7:1004. [PMID: 27462333 PMCID: PMC4939296 DOI: 10.3389/fpls.2016.01004] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 06/27/2016] [Indexed: 05/15/2023]
Abstract
Hypericum perforatum is a perennial plant, with worldwide distribution, commonly known as St. John's wort. It has been used for centuries in traditional medicine for the treatment of several disorders, such as minor burns, anxiety, and mild to moderate depression. In the past years, its antidepressant properties have been extensively studied. Despite that, other H. perforatum biological activities, as its neuroprotective properties have also been evaluated. The present review aims to provide a comprehensive summary of the main biologically active compounds of H. perforatum, as for its chemistry, pharmacological activities, drug interactions and adverse reactions and gather scattered information about its neuroprotective abilities. As for this, it has been demonstrated that H. perforatum extracts and several of its major molecular components have the ability to protect against toxic insults, either directly, through neuroprotective mechanisms, or indirectly, through is antioxidant properties. H. perforatum has therefore the potential to become an effective neuroprotective therapeutic agent, despite further studies that need to be carried out.
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Affiliation(s)
- Ana I. Oliveira
- Nucleo de Investigação e Informação em Farmácia, Centro de Investigação em Saúde e Ambiente, Escola Superior de Tecnologia de Saúde do Porto – Instituto Politécnico do Porto, Vila Nova de GaiaPortugal
- Agrobioplant Group (CITAB-UM), Department of Biology, University of Minho, BragaPortugal
| | - Cláudia Pinho
- Nucleo de Investigação e Informação em Farmácia, Centro de Investigação em Saúde e Ambiente, Escola Superior de Tecnologia de Saúde do Porto – Instituto Politécnico do Porto, Vila Nova de GaiaPortugal
- Agrobioplant Group (CITAB-UM), Department of Biology, University of Minho, BragaPortugal
| | - Bruno Sarmento
- Cooperativa de Ensino Superior Politécnico e Universitário, Instituto de Investigação e Formação Avançada em Ciências e Tecnologias da Saúde, Gandra PRDPortugal
- Instituto de Investigação e Inovação em Saúde, PortoPortugal
- Instituto de Engenharia Biomédica, PortoPortugal
| | - Alberto C. P. Dias
- Agrobioplant Group (CITAB-UM), Department of Biology, University of Minho, BragaPortugal
- *Correspondence: Alberto C. P. Dias,
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Gupta N, Lobo R, Kumar N, Bhagat JK, Mathew JE. Identity-based High-performance thin Layer Chromatography Fingerprinting Profile and Tumor Inhibitory Potential of Anisochilus carnosus (L.f.) wall Against Ehrlich Ascites Carcinoma. Pharmacogn Mag 2015; 11:S474-80. [PMID: 26929584 PMCID: PMC4745220 DOI: 10.4103/0973-1296.168977] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
CONTEXT Anisochilus carnosus (L.f.) wall belonging to the family Lamiaceae is a plant that is widely used in folk medicine for treating eczema, cold, cough, and fever. OBJECTIVE In the present study, we explored the anticancer potential of A. carnosus leaves against Ehrlich ascites carcinoma (EAC) and estimated the quantity of luteolin present in various extracts and fractions of A. carnosus by high-performance thin layer chromatography (HPTLC) fingerprinting. MATERIALS AND METHODS Various factors such as tumor volume, tumor cell viability, tumor weight, prolongation of lifespan, and hematological parameters were assessed. RESULT We observed a significant lowering in tumor volume, tumor weight, and cell viability in EAC-induced mice following intervention with A. carnosus extracts. Also, there was a considerable prolongation of host lifespan and restoration of hematological parameters to almost normal levels with A. carnosus treatment. HPTLC fingerprinting of various extracts and fractions of A. carnosus along with luteolin as the reference standard revealed the occurrence of luteolin in all tested extracts and fractions of A. carnosus with the highest concentration being reported in the ethanol fraction. CONCLUSION A. carnosus exhibits potent anti-tumor potential which can most likely be attributed to the occurrence of different phytochemicals such as phytosterols, terpenoids, and flavonoids in the plant. Further studies to isolate compounds from A. carnosus and understand the mechanism of anti-tumor activity would be worthwhile. SUMMARY EAC induced mice that received A. carnosus treatment exhibited significant reduction in tumor volume, tumor weight and tumor cell viability. Their life span was considerably prolonged. We detected luteolin in A. carnosus aqueous and ethanol extract using HPTLC. Hence, anticancer activity of A. carnosus can be partly attributed to the presence of luteolin.
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Affiliation(s)
- Nilesh Gupta
- Department of Pharmacognosy, Manipal College of Pharmaceutical Sciences, Manipal University, Manipal, Karnataka, India
| | - Richard Lobo
- Department of Pharmacognosy, Manipal College of Pharmaceutical Sciences, Manipal University, Manipal, Karnataka, India
| | - Nimmy Kumar
- Department of Pharmacognosy, Manipal College of Pharmaceutical Sciences, Manipal University, Manipal, Karnataka, India
| | - Jay Kumar Bhagat
- Department of Pharmacognosy, Manipal College of Pharmaceutical Sciences, Manipal University, Manipal, Karnataka, India
| | - Jessy Elizabeth Mathew
- Department of Pharmaceutical Chemistry, Manipal College of Pharmaceutical Sciences, Manipal University, Manipal, Karnataka, India
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Karimova E, Baltina L, Spirikhin L, Gabbasov T, Orshanskaya Y, Zarubaev V. Synthesis and Antiviral Activity of Quercetin Brominated Derivatives. Nat Prod Commun 2015. [DOI: 10.1177/1934578x1501000920] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Reaction of quercetin (QR) (1) with bromine under various conditions was studied. Interaction of QR with 2–3 equiv. of bromine in glacial acetic acid at 35–40°C for 2–4 h and 20–22°C for 24 h led to the formation of QR 6,8-dibromide (2) (52–54% yields, 96–98% purity by HPLC). Interaction of QR with 2–5 equiv. bromine in absolute ethanol at 0–5°C and 20–22°C for 24 h led to the formation of 3- O-ethyl-QR-2,3,6,8,5′-pentabromide (3) (95–97% purity by HPLC) the output of which depends on the quantity of bromine. It was shown in MDCK cell culture that compound 2 exhibits a moderate inhibitory activity against pandemic influenza virus A/H1N1/pdm09 (EC50 6.0 μg/mL, CTD50 97.7 μg/mL, SI 16). Compound 3 was inactive.
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Affiliation(s)
- Elza Karimova
- Laboratory of Bioorganic Chemistry, Ufa Institute of Chemistry, Russian Academy of Sciences, Prospect Oktyabrya 71, Ufa 450054, Russian Federation
- Department of Technical Chemistry and Materials Science, Faculty of Engineering, Bashkir State University, Zaki Validi str. 32, Ufa 450076, Russian Federation
| | - Lidia Baltina
- Laboratory of Bioorganic Chemistry, Ufa Institute of Chemistry, Russian Academy of Sciences, Prospect Oktyabrya 71, Ufa 450054, Russian Federation
| | - Leonid Spirikhin
- Laboratory of Bioorganic Chemistry, Ufa Institute of Chemistry, Russian Academy of Sciences, Prospect Oktyabrya 71, Ufa 450054, Russian Federation
| | - Tagir Gabbasov
- Laboratory of Bioorganic Chemistry, Ufa Institute of Chemistry, Russian Academy of Sciences, Prospect Oktyabrya 71, Ufa 450054, Russian Federation
| | - Yana Orshanskaya
- Influenza Research Institute, Ministry of Health Russia, Prof. Popov str.15/17, St. Petersburg 197376, Russian Federation
| | - Vladimir Zarubaev
- Influenza Research Institute, Ministry of Health Russia, Prof. Popov str.15/17, St. Petersburg 197376, Russian Federation
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Nam YJ, Lee DH, Shin YK, Sohn DS, Lee CS. Flavanonol Taxifolin Attenuates Proteasome Inhibition-Induced Apoptosis in Differentiated PC12 Cells by Suppressing Cell Death Process. Neurochem Res 2014; 40:480-91. [DOI: 10.1007/s11064-014-1493-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Revised: 11/05/2014] [Accepted: 11/29/2014] [Indexed: 12/22/2022]
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Sahiner N. One step poly(rutin) particle preparation as biocolloid and its characterization. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 44:9-16. [PMID: 25280674 DOI: 10.1016/j.msec.2014.08.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Revised: 07/02/2014] [Accepted: 08/01/2014] [Indexed: 12/22/2022]
Abstract
Poly(rutin) p(RT) particles were prepared for the first time via a simple microemulsion polymerization/crosslinking method using l-α lecithin as surfactant, cyclohexane as organic phase and glycerol diglycidyl ether (GDE) as a crosslinking agent. Highly negatively charged p(RT) particles, -48.2 mV, were obtained due to phenolic groups on the particles. It was also confirmed that p(RT) particles are thermally more stable than RT and degradable in PBS at pH7.4., e.g., 11 wt.% can degrade in 1 day and little further degradation was observed over 9 days. The prepared p(RT) particles showed insignificant antibacterial characteristics against common bacteria such as Escherichia coli ATCC8739, Staphylococcus aureus ATCC6538, and Bacillus subtilis ATCC6633 whereas the RT molecules showed significantly better antibacterial characteristics even at low concentrations. Moreover, p(RT) particles were demonstrated for use as drug delivery devices by loading rosmarinic acid (RA) as model drug and showed release capability for up to 6 days by releasing 85% of the loaded RA. Intriguingly, p(RT) particles illustrated enhanced fluorescent properties providing great potential for fluorescent active antioxidant and antibacterial materials in biomedical use.
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Affiliation(s)
- Nurettin Sahiner
- Faculty of Science & Arts, Chemistry Department, Canakkale Onsekiz Mart University, Terzioglu Campus, 17100 Canakkale, Turkey; Nanoscience and Technology Research and Application Center (NANORAC), Canakkale Onsekiz Mart University, Terzioglu Campus, 17100 Canakkale, Turkey.
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Bhagat J, Lobo R, Kumar N, Mathew JE, Pai A. Cytotoxic potential of Anisochilus carnosus (L.f.) wall and estimation of luteolin content by HPLC. BMC COMPLEMENTARY AND ALTERNATIVE MEDICINE 2014; 14:421. [PMID: 25348394 PMCID: PMC4226858 DOI: 10.1186/1472-6882-14-421] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2014] [Accepted: 10/17/2014] [Indexed: 11/10/2022]
Abstract
BACKGROUND Anisochilus carnosus (L.f.) wall (Lamiaceae), an annual herb which grows at high altitude is used extensively in folk medicine for the treatment of ailments such as gastric ulcer and skin diseases. The aim of our study was to evaluate the anticancer activity of different extracts of the leaves of A.carnosus. An attempt was also made to estimate the luteolin content in different extracts of Anisochilus carnosus by HPLC (High Performance Liquid Chromatography). METHODS In the current study, we explored the cytotoxic potential of petroleum ether, ethanolic and aqueous extracts of A.carnosus against breast adenocarcinoma cell line (BT-549), by in vitro MTT and SRB assay. We also detected the luteolin content in different extracts (ethanolic and aqueous) of A.carnosus by using HPLC as a tool of analysis. RESULTS The results demonstrate that petroleum ether and ethanolic extract of A.carnosus showed potent cytotoxic effect against BT-549 with an IC50 of 22.5 μg/ml (petroleum ether extract) and 87.24 μg/ml (ethanolic extract), by SRB assay, and 18.35 μg/ml (petroleum ether extract) and 58.64 μg/ml (ethanolic extract), by MTT assay. The aqueous extracts showed less cytotoxic effect with an IC50 of 211.26 μg/ml (by SRB assay) and 238.91 μg/ml (by MTT assay). HPLC results of luteolin content in various extracts using luteolin as the marker compound indicated the ethanol extract to contain the highest concentration of luteolin (0.372% w/w). The aqueous extract contained lower concentration of luteolin (0.282% w/w). CONCLUSION Our findings demonstrate that petroleum ether and ethanolic extract of A.carnosus shows promising anticancer activity and has the potential to be developed into a therapeutic option for the treatment of cancer.
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CHEN ZHI, SHEN BAOLIANG, FU QINGGE, WANG FEI, TANG YIXING, HOU CANGLONG, CHEN LI. CUL4B promotes proliferation and inhibits apoptosis of human osteosarcoma cells. Oncol Rep 2014; 32:2047-53. [DOI: 10.3892/or.2014.3465] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2014] [Accepted: 06/10/2014] [Indexed: 01/10/2023] Open
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Mecocci P, Tinarelli C, Schulz RJ, Polidori MC. Nutraceuticals in cognitive impairment and Alzheimer's disease. Front Pharmacol 2014; 5:147. [PMID: 25002849 PMCID: PMC4066843 DOI: 10.3389/fphar.2014.00147] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Accepted: 06/03/2014] [Indexed: 12/31/2022] Open
Abstract
Several chemical substances belonging to classes of natural dietary origin display protective properties against some age-related diseases including neurodegenerative ones, particularly Alzheimer's disease (AD). These compounds, known as nutraceuticals, differ structurally, act therefore at different biochemical and metabolic levels and have shown different types of neuroprotective properties. The aim of this review is to summarize data from observational studies, clinical trials, and randomized clinical trials (RCTs) in humans on the effects of selected nutraceuticals against age-related cognitive impairment and dementia. We report results from studies on flavonoids, some vitamins and other natural substances that have been studied in AD and that might be beneficial for the maintenance of a good cognitive performance. Due to the substantial lack of high-level evidence studies there is no possibility for recommendation of nutraceuticals in dementia-related therapeutic guidelines. Nevertheless, the strong potential for their neuroprotective action warrants further studies in the field.
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Affiliation(s)
- P. Mecocci
- Section of Gerontology and Geriatrics, Department of Medicine, University of PerugiaPerugia, Italy
| | - C. Tinarelli
- Section of Gerontology and Geriatrics, Department of Medicine, University of PerugiaPerugia, Italy
| | - R. J. Schulz
- Geriatrics Department, Medical Faculty, University of CologneCologne, Germany
| | - M. C. Polidori
- Geriatrics Department, Medical Faculty, University of CologneCologne, Germany
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Digitoflavone inhibits IκBα kinase and enhances apoptosis induced by TNFα through downregulation of expression of nuclear factor κB-regulated gene products in human pancreatic cancer cells. PLoS One 2013; 8:e77126. [PMID: 24146961 PMCID: PMC3795624 DOI: 10.1371/journal.pone.0077126] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Accepted: 09/08/2013] [Indexed: 12/24/2022] Open
Abstract
Tumor necrosis factor-α (TNFα) activates both cell death and cell survival pathways. The activation of survival pathway renders most cancer cells resistant to TNF-induced cytotoxicity. We found that pretreatment with digitoflavone, a plant flavonoid, greatly sensitized TNFα-induced apoptotic cell death in several human pancreatic cancer cells. In search of the molecular basis of the sensitization effect of digitoflavone, digitoflavone was found to inhibit TNFα-induced activation of nuclear transcription factor-kappa B (NF-κB) which is the main survival factor in TNFα signaling. NF-κB suppression occurred through inhibition of IκBα kinase activation, IκBα phosphorylation, IκBα degradation, and NF-κB nuclear translocation. This inhibition correlated with suppression of NF-κB-dependent genes involved in antiapoptosis (mcl-1, bcl-2, bcl-xl, c-iap1, c-iap2, flip, and survivin), proliferation (c-myc, cyclin d1), and angiogenesis (vegf, cox-2, and mmp-9). In addition, digitoflavone can activate JNK through inhibition of NF-κB signaling, provide a continuous blockade of the feed-back inhibitory mechanism by JNK-induced NF-κB activation. This study found a novel function of digitoflavone and enhanced the value of digitoflavone as an anticancer agent.
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González-Burgos E, Carretero ME, Gómez-Serranillos MP. Kaurane diterpenes from Sideritis spp. exert a cytoprotective effect against oxidative injury that is associated with modulation of the Nrf2 system. PHYTOCHEMISTRY 2013; 93:116-123. [PMID: 23642391 DOI: 10.1016/j.phytochem.2013.03.017] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Revised: 03/22/2013] [Accepted: 03/27/2013] [Indexed: 06/02/2023]
Abstract
Kaurane diterpenes have been shown to possess antioxidant properties. As a part of our ongoing studies on the identification of biologically active diterpenes from Sideritis spp., we have previously isolated and structurally elucidated the major kaurane diterpenes foliol, linearol and sidol, in a previous study from the aerial parts of Sideritis linearifolia and Sideritis leucantha. We have now examined the ability of these compounds to protect PC12 cells in an H2O2-induced oxidative stress model. Linearol and sidol (5 and 10 μM, 24 h) significantly attenuated loss of mitochondrial function (MTT assay) and membrane integrity (LDH assay) and morphological changes associated with H2O2-mediated cytotoxicity. Moreover, pretreatments with linearol and sidol effectively reduced intracellular ROS production, decreased MDA levels (lipid peroxidation product) and restored GSH/GSSG ratio. Furthermore, analysis of the effect of diterpenes on antioxidant enzymes showed that linearol and sidol induced the upregulation and protein expression of the main antioxidant enzymes CAT, SOD, GPx, GR and HO-1. Considering molecular mechanisms for maintaining cellular redox homeostasis by linearol and sidol, it would appear that the Nrf2 transcription factor seems to be involved. These results indicate that linearol and sidol are potential cytoprotective compounds, through antioxidant mechanisms, under H2O2-induced oxidative stress.
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Affiliation(s)
- E González-Burgos
- Department of Pharmacology, Faculty of Pharmacy, University Complutense, Madrid, Spain
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Wang TT, Wang SK, Huang GL, Sun GJ. Luteolin induced-growth inhibition and apoptosis of human esophageal squamous carcinoma cell line Eca109 cells in vitro. Asian Pac J Cancer Prev 2013; 13:5455-61. [PMID: 23317200 DOI: 10.7314/apjcp.2012.13.11.5455] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Luteolin is a plant flavonoid which exhibits anti-oxidative, anti-inflammatory and anti-tumor effects. However, the antiproliferative potential of luteolin is not fully understood. In this study, we investigated the effect of luteolin on cell cycling and apoptosis in human esophageal squamous carcinoma cell line Eca109 cells. MTT assays showed that luteolin had obvious cytotoxicity on Eca109 with an IC50 of 70.7±1.72 μM at 24 h. Luteolin arrested cell cycle progression in the G0/G1 phase and prevented entry into S phase in a dose- and time-dependent manner. as assessed by FCM. Luteolin induced apoptosis of Eca109 cells was demonstrated by AO/EB staining assay and annexin V-FITC/PI staining. Moreover, luteolin downregulated the expression of cyclin D1, survivin and c-myc, and it also upregulated the expression of p53, in line with the fact that luteolin was able to inhibit Eca109 cell proliferation.
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Affiliation(s)
- Ting-Ting Wang
- Key Laboratory of Environmental Medicine and Engineering of Ministry of Education, and Department of Nutrition and Food Hygiene, School of Public Health, Southeast University, Nanjing, China
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Araújo KCF, de M.B. Costa EM, Pazini F, Valadares MC, de Oliveira V. Bioconversion of quercetin and rutin and the cytotoxicity activities of the transformed products. Food Chem Toxicol 2013; 51:93-6. [DOI: 10.1016/j.fct.2012.09.015] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2011] [Revised: 09/10/2012] [Accepted: 09/12/2012] [Indexed: 10/27/2022]
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Freischmidt A, Jürgenliemk G, Kraus B, Okpanyi SN, Müller J, Kelber O, Weiser D, Heilmann J. Contribution of flavonoids and catechol to the reduction of ICAM-1 expression in endothelial cells by a standardised Willow bark extract. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2012; 19:245-252. [PMID: 21982436 DOI: 10.1016/j.phymed.2011.08.065] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Revised: 07/29/2011] [Accepted: 08/22/2011] [Indexed: 05/31/2023]
Abstract
INTRODUCTION A quantified aqueous Willow bark extract (STW 33-I) was tested concerning its inhibitory activity on TNF-α induced ICAM-1 expression in human microvascular endothelial cells (HMEC-1) and further fractionated to isolate the active compounds. RESULTS At 50 μg/ml the extract, which had been prepared from Salix purpurea L., decreased ICAM-1 expression to 40% compared to control cells without showing cytotoxic effects. Further liquid-liquid partition revealed an ethyl acetate phase with potent reduction of ICAM-1 expression to 40% at 8 μg/ml. This fraction was comprehensively characterised by the isolation of flavanone aglyca and their corresponding glycosides, chalcone glycosides, salicin derivatives, cyclohexane-1,2-diol glycosides, catechol and trans-p-coumaric acid. All compounds were investigated for their activity on TNF-α induced ICAM-1 expression. The flavonoid and chalcone glycosides were not active up to 50 μM, whereas catechol and eriodictyol at the same concentration showed a significant reduction of ICAM-1 expression to 50% of control. Interestingly, other isolated flavanone aglyca like taxifolin, dihydrokaempferol and naringenin showed only weak or moderate inhibitory activity. Eriodictyol was a minor compound in the extract, whereas the catechol content in the extract (without excipients) reached 2.3%, determined by HPLC. One of the isolated cyclohexan-1,2-diol glucosides, 6'-O-4-hydroxybenzoyl-grandidentin, is a new natural compound. CONCLUSION As catechol is quantitatively important in Willow bark extracts it can be concluded from the in vitro data that not only flavonoids and salicin derivatives, but also catechol can probably contribute to the anti-inflammatory activity of Willow bark extracts.
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Affiliation(s)
- A Freischmidt
- Lehrstuhl für Pharmazeutische Biologie, Universität Regensburg, 93040 Regensburg, Germany
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Cai X, Ye T, Liu C, Lu W, Lu M, Zhang J, Wang M, Cao P. Luteolin induced G2 phase cell cycle arrest and apoptosis on non-small cell lung cancer cells. Toxicol In Vitro 2011; 25:1385-91. [PMID: 21601631 DOI: 10.1016/j.tiv.2011.05.009] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2011] [Revised: 04/18/2011] [Accepted: 05/01/2011] [Indexed: 10/18/2022]
Abstract
In this study, we investigated the underlying molecular mechanism for the potent cell cycle inhibition and pro-apoptotic effect of luteolin (2-(3,4-dihydroxyphenyl)-5,7-dihydroxy-4-chromenone) on human non-small-cell lung carcinoma cell line A549. MTT assay showed that luteolin had obvious cytotoxicity on A549 with IC(50) of 40.2 μM at 48 h. Pro-apoptotic effect of luteolin on A549 cells was demonstrated by Hoechst 33258 staining assay and annexin V-FITC/PI double staining analysis. A great quantity of apoptotic cells and increasing G2 phase cells were observed by flow cytometry. Western blotting assay revealed that luteolin activated JNK, increased Bax, promoted procaspase-9 cleavage and activated caspase-3 at last. Assay using TNFα, an active agent of NF-κB, showed that pretreatment of A549 cells with luteolin could inhibit TNFα induced trans-nuclear of NF-κB. In summary, luteolin displayed a significant cytotoxic effect through cell cycle arrest and apoptosis induction in A549 cells. Pro-apoptotic effect was implemented via activating JNK and inhibiting translocation of NF-κB (p65). These results suggested that luteolin might have therapeutic potential against NSCLC.
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Affiliation(s)
- Xueting Cai
- School of Life Science and Technology, China Pharmaceutical University, Nanjing 210009, Jiangsu, China
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Kelsey NA, Wilkins HM, Linseman DA. Nutraceutical antioxidants as novel neuroprotective agents. Molecules 2010; 15:7792-814. [PMID: 21060289 PMCID: PMC4697862 DOI: 10.3390/molecules15117792] [Citation(s) in RCA: 300] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2010] [Accepted: 10/20/2010] [Indexed: 12/20/2022] Open
Abstract
A variety of antioxidant compounds derived from natural products (nutraceuticals) have demonstrated neuroprotective activity in either in vitro or in vivo models of neuronal cell death or neurodegeneration, respectively. These natural antioxidants fall into several distinct groups based on their chemical structures: (1) flavonoid polyphenols like epigallocatechin 3-gallate (EGCG) from green tea and quercetin from apples; (2) non-flavonoid polyphenols such as curcumin from tumeric and resveratrol from grapes; (3) phenolic acids or phenolic diterpenes such as rosmarinic acid or carnosic acid, respectively, both from rosemary; and (4) organosulfur compounds including the isothiocyanate, L-sulforaphane, from broccoli and the thiosulfonate allicin, from garlic. All of these compounds are generally considered to be antioxidants. They may be classified this way either because they directly scavenge free radicals or they indirectly increase endogenous cellular antioxidant defenses, for example, via activation of the nuclear factor erythroid-derived 2-related factor 2 (Nrf2) transcription factor pathway. Alternative mechanisms of action have also been suggested for the neuroprotective effects of these compounds such as modulation of signal transduction cascades or effects on gene expression. Here, we review the literature pertaining to these various classes of nutraceutical antioxidants and discuss their potential therapeutic value in neurodegenerative diseases.
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Affiliation(s)
- Natalie A. Kelsey
- Department of Biological Sciences and Eleanor Roosevelt Institute, University of Denver, Denver, Colorado 80208, USA; E-Mails: (N.A.K.); (H.M.W.)
| | - Heather M. Wilkins
- Department of Biological Sciences and Eleanor Roosevelt Institute, University of Denver, Denver, Colorado 80208, USA; E-Mails: (N.A.K.); (H.M.W.)
| | - Daniel A. Linseman
- Department of Biological Sciences and Eleanor Roosevelt Institute, University of Denver, Denver, Colorado 80208, USA; E-Mails: (N.A.K.); (H.M.W.)
- Research Service, Veterans Affairs Medical Center, Denver, Colorado 80220, USA
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +1 (303) 871-5654; Fax: +1 (303) 871-5699
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Pavlica S, Gebhardt R. Protective effects of flavonoids and two metabolites against oxidative stress in neuronal PC12 cells. Life Sci 2010; 86:79-86. [DOI: 10.1016/j.lfs.2009.10.017] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2009] [Revised: 10/26/2009] [Accepted: 10/28/2009] [Indexed: 01/08/2023]
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Silva JP, Gomes AC, Proença F, Coutinho OP. Novel nitrogen compounds enhance protection and repair of oxidative DNA damage in a neuronal cell model: Comparison with quercetin. Chem Biol Interact 2009; 181:328-37. [DOI: 10.1016/j.cbi.2009.07.024] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2009] [Revised: 07/29/2009] [Accepted: 07/29/2009] [Indexed: 11/24/2022]
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Ossola B, Kääriäinen TM, Männistö PT. The multiple faces of quercetin in neuroprotection. Expert Opin Drug Saf 2009; 8:397-409. [PMID: 19538101 DOI: 10.1517/14740330903026944] [Citation(s) in RCA: 105] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
This review discusses the most recent data on the potential of quercetin to confer neuroprotection. Unfortunately, most of the in vitro studies have used quercetin aglycone, which is not detectable in the plasma or in the brain after oral intake. Moreover, quercetin metabolites and glycosides seem to be less neuroprotective and penetrate the BBB less efficiently than aglycone. Surprisingly, quercetin has beneficial effects on various in vivo models of neural disorders, particularly in cerebrovascular insults; contrasting data also do exist. This may be due to an increase of BBB permeability, described in many of these animal models, which would facilitate quercetin brain penetration. Although quercetin causes no significant toxicity in several animal studies, the risk for neurotoxicity is not negligible because of its narrow therapeutic dose-range in vitro. Notably, this risk may be even higher in the case of increased quercetin access to the brain, which may occur pathologically or artificially (e.g., by liposomal preparations). Based on the referred literature, we doubt that quercetin possesses any significant efficacy in neurodegenerative disorders. Instead, therapeutic trials should focus more on the quercetin efficacy in cerebrovascular insults rather than neurodegeneration.
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Affiliation(s)
- Bernardino Ossola
- University of Helsinki, Division of Pharmacology & Toxicology PO Box 56, (Viikinkaari 5E), Helsinki FIN-00014, Finland
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Shirai M, Kawai Y, Yamanishi R, Kinoshita T, Chuman H, Terao J. Effect of a conjugated quercetin metabolite, quercetin 3-glucuronide, on lipid hydroperoxide-dependent formation of reactive oxygen species in differentiated PC-12 cells. Free Radic Res 2009; 40:1047-53. [PMID: 17015249 DOI: 10.1080/10715760600794287] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
To assess the efficacy of conjugated quercetin metabolites as attenuators for oxidative stress in the central nervous system, we measured the 13-hydroperoxyoctadecadienoic acid (13-HPODE)-dependent formation of reactive oxygen species (ROS) in pheochromocytoma PC-12 cells in the presence of quercetin 3-O-beta-glucuronide (Q3GA) and related compounds. A 2',7'-dichlorofluorescin (DCFH) assay showed that Q3GA significantly suppressed the formation of ROS, when it was coincubated with 13-HPODE (coincubation system). However, it was less effective than quercetin aglycon in the concentration range from 0.5 to 10 microM. In an experiment in which the cells were incubated with the test compounds for 24 h before being exposed to 13-HPODE, Q3GA was also effective in suppressing the formation of ROS in spite that little Q3GA was taken up into the cells. These results suggest that antioxidative metabolites of quercetin are capable of protecting nerve cells from attack of lipid hydroperoxides.
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Affiliation(s)
- Mutsuko Shirai
- Department of Food Science, Institute for Health Biosciences, The University of Tokushima Graduate School, Kuramoto-cho 3, Tokushima 770-8503, Japan
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Silva JP, Gomes AC, Coutinho OP. Oxidative DNA damage protection and repair by polyphenolic compounds in PC12 cells. Eur J Pharmacol 2008; 601:50-60. [PMID: 18996367 DOI: 10.1016/j.ejphar.2008.10.046] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2008] [Revised: 10/03/2008] [Accepted: 10/23/2008] [Indexed: 01/10/2023]
Abstract
Biological systems are frequently exposed to excessive reactive oxygen species, causing a disturbance in the cells natural antioxidant defence systems and resulting in damage to all biomolecules, including nucleic acids. In fact, oxidative DNA damage is described as the type of damage most likely to occur in neuronal cells. In this study, three polyphenolic compounds, luteolin, quercetin and rosmarinic acid, were investigated for their protective effects against oxidative DNA damage induced in PC12 cells, a neuronal cell model. Although luteolin and quercetin prevented the formation of strand breaks to a greater extent than rosmarinic acid, this last one presented the highest capacity to repair strand breaks formation. In addition, rosmarinic acid was the only compound tested that increased the repair of oxidized nucleotidic bases induced with the photosensitizer compound [R]-1-[(10-chloro-4-oxo-3-phenyl-4H-benzo[a]quinolizin-1-yl) carbonyl]-2-pyrrolidine-methanol (Ro 19-8022). The activity of repair enzymes was indicated by the in vitro base excision repair assay, using a cell-free extract obtained from cells previously treated with the compounds to incise DNA. The protective effect of rosmarinic acid was further confirmed by the increased expression of OGG1 repair gene, observed through real time RT-PCR. The data obtained is indicative that rosmarinic acid seems to act on the intracellular mechanisms responsible for DNA repair, rather than by a direct effect on reactive oxygen species scavenging, as deducted from the effects observed for luteolin and quercetin. Therefore, these results suggest the importance of these polyphenols, and in particular rosmarinic acid, as protectors of oxidative stress-induced DNA damage that commonly occurs in several pathological conditions, such as neurodegenerative diseases.
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Affiliation(s)
- João P Silva
- CBMA - Molecular and Environmental Biology Centre/Biology Department, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
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Sasaki M, Nakamura H, Tsuchiya S, Horie S, Kashiwayanagi M, Saito T, Murayama T. Quercetin-Induced PC12 Cell Death Accompanied by Caspase-Mediated DNA Fragmentation. Biol Pharm Bull 2007; 30:682-6. [PMID: 17409502 DOI: 10.1248/bpb.30.682] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Flavonoids have been reported to be potent antioxidants and beneficial in oxidative stress related diseases. Quercetin, a major flavonoid in food, deserves much attention because of its antioxidative activity. However, the actions of flavonoids including quercetin are complex and paradoxical. Quercetin caused apoptosis and/or cell death in various cells including cancer cells and normal cells. In this study, we investigated the effects of quercetin with or without hydrogen peroxide (H2O2) on cell death of PC12 cells, a neuronal cell line. We showed that quercetin at 10-30 microM alone caused cell death accompanied by caspase-mediated DNA fragmentation in undifferentiated PC12 cells. Quercetin did not inhibit and rather enhanced 0.1 mM H2O2-induced cell death. The toxic effect of quercetin was not inhibited by antioxidants such as N-acetylcysteine and GSH, although H2O2-induced cell death was inhibited by the antioxidants. Quercetin-induced cell death was reduced by 2 h treatment with nerve growth factor and serum. In addition, quercetin caused cell death in differentiated PC12 cells that were cultured with nerve growth factor for 6 d. Genistein, a soy isoflavone that has the pro-apoptotic activity, also caused cell death with DNA fragmentation. Further evaluation of the potential of dietary flavonoids as neuroprotective reagents is needed.
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Affiliation(s)
- Masumi Sasaki
- Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, Chiba University, Japan
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Khanna S, Roy S, Parinandi NL, Maurer M, Sen CK. Characterization of the potent neuroprotective properties of the natural vitamin E alpha-tocotrienol. J Neurochem 2006; 98:1474-86. [PMID: 16923160 PMCID: PMC1847628 DOI: 10.1111/j.1471-4159.2006.04000.x] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The natural vitamin E tocotrienols possess properties not shared by tocopherols. Nanomolar alpha-tocotrienol, not alpha-tocopherol, is potently neuroprotective. On a concentration basis, this finding represents the most potent of all biological functions exhibited by any natural vitamin E molecule. We sought to dissect the antioxidant-independent and -dependent neuroprotective properties of alpha-tocotrienol by using two different triggers of neurotoxicity, homocysteic acid (HCA) and linoleic acid. Both HCA and linoleic acid caused neurotoxicity with comparable features, such as increased ratio of oxidized to reduced glutathione GSSG/GSH, raised intracellular calcium concentration and compromised mitochondrial membrane potential. Mechanisms underlying HCA-induced neurodegeneration were comparable to those in the path implicated in glutamate-induced neurotoxicity. Inducible activation of c-Src and 12-lipoxygenase (12-Lox) represented early events in that pathway. Overexpression of active c-Src or 12-Lox sensitized cells to HCA-induced death. Nanomolar alpha-tocotrienol was protective. Knock-down of c-Src or 12-Lox attenuated HCA-induced neurotoxicity. Oxidative stress represented a late event in HCA-induced death. The observation that micromolar, but not nanomolar, alpha-tocotrienol functions as an antioxidant was verified in a model involving linoleic acid-induced oxidative stress and cell death. Oral supplementation of alpha-tocotrienol to humans results in a peak plasma concentration of 3 microm. Thus, oral alpha-tocotrienol may be neuroprotective by antioxidant-independent as well as antioxidant-dependent mechanisms.
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Affiliation(s)
- Savita Khanna
- Laboratory of Molecular Medicine, Department of Surgery, Davis Heart and Lung Research Institute, The Ohio State University Medical Center, Colombus, Ohio 43210, USA
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Lima CF, Fernandes-Ferreira M, Pereira-Wilson C. Phenolic compounds protect HepG2 cells from oxidative damage: relevance of glutathione levels. Life Sci 2006; 79:2056-68. [PMID: 16857214 DOI: 10.1016/j.lfs.2006.06.042] [Citation(s) in RCA: 154] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2006] [Revised: 06/22/2006] [Accepted: 06/30/2006] [Indexed: 01/16/2023]
Abstract
In the present work, the potential hepatoprotective effects of five phenolic compounds against oxidative damages induced by tert-butyl hydroperoxide (t-BHP) were evaluated in HepG2 cells in order to relate in vitro antioxidant activity with cytoprotective effects. t-BHP induced considerable cell damage in HepG2 cells as shown by significant LDH leakage, increased lipid peroxidation, DNA damage as well as decreased levels of reduced glutathione (GSH). All tested phenolic compounds significantly decreased cell death induced by t-BHP (when in co-incubation). If the effects of quercetin are given the reference value 1, the compounds rank in the following order according to inhibition of cell death: luteolin (4.0) > quercetin (1.0) > rosmarinic acid (0.34) > luteolin-7-glucoside (0.30) > caffeic acid (0.21). The results underscore the importance of the compound's lipophilicity in addition to its antioxidant potential for its biological activity. All tested phenolic compounds were found to significantly decrease lipid peroxidation and prevent GSH depletion induced by t-BHP, but only luteolin and quercetin significantly decreased DNA damage. Therefore, the lipophilicity of the natural antioxidants tested appeared to be of even greater importance for DNA protection than for cell survival. The protective potential against cell death was probably achieved mainly by preventing intracellular GSH depletion. The phenolic compounds studied here showed protective potential against oxidative damage induced in HepG2 cells. This could be beneficial against liver diseases where it is known that oxidative stress plays a crucial role.
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Affiliation(s)
- Cristovao F Lima
- Department of Biology, Centre of Biology, School of Sciences, University of Minho, 4710-057 Braga, Portugal
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Jiménez-Atiénzar M, Escribano J, Cabanes J, Gandía-Herrero F, García-Carmona F. The Flavonoid Eriodictyol as Substrate of Peach Polyphenol Oxidase. J Food Sci 2006. [DOI: 10.1111/j.1365-2621.2005.tb08302.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Jiménez-Atiénzar M, Escribano J, Cabanes J, Gandía-Herrero F, García-Carmona F. Oxidation of the flavonoid eriodictyol by tyrosinase. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2005; 43:866-73. [PMID: 16289948 DOI: 10.1016/j.plaphy.2005.07.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2005] [Revised: 06/10/2005] [Accepted: 07/21/2005] [Indexed: 05/05/2023]
Abstract
A pathway is proposed for the oxidation of the flavonoid eriodictyol by mushroom tyrosinase. In it, the enzymatic oxidation of eriodictyol leads to the formation of eriodictyol-o-quinone, which undergoes the nucleophilic attack of another eriodictyol unit to yield a dimer. This dimer is then oxidized by the eriodictyol-o-quinone. The reaction was followed by recording the time course of formation of this second o-quinone at 475 nm. Progress curves at this wavelength showed the appearance of a lag, the length of which varied with enzyme and substrate concentrations, and which must have been caused by the chemical reactions taking place after the enzymatic reaction. When eriodictyol oxidation was studied in the presence of 3-methyl-2-benzothiazolinone hydrazone hydrochloride (MBTH), which competes with the substrate in the reaction with eriodictyol-o-quinone, the lag disappeared. The kinetic parameters were similar with and without MBTH. Eriodictyol oxidation was inhibited by tropolone, which behaved as a slow-binding inhibitor.
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Affiliation(s)
- Mercedes Jiménez-Atiénzar
- Departamento de Bioquímica y Biología Molecular A, Facultad de Biología, Unidad Docente de Biología, Universidad de Murcia, Campus de Espinardo, Apdo. 4021, E-30080 Murcia, Spain.
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Matsuo M, Sasaki N, Saga K, Kaneko T. Cytotoxicity of flavonoids toward cultured normal human cells. Biol Pharm Bull 2005; 28:253-9. [PMID: 15684479 DOI: 10.1248/bpb.28.253] [Citation(s) in RCA: 156] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The cytotoxicity of flavonoids, including apigenin, eriodictyol, 3-hydroxyflavone, kaempherol, luteolin, naringenin, quercetin, rutin, and taxifolin, toward cultured human normal cells, i.e., human lung embryonic fibroblasts (TIG-1) and human umbilical vein endothelial (HUVE) cells, was examined. When these normal human cells were incubated with each flavonoid in culture medium for 24 h, some of the flavonoids showed considerable cytotoxicity at relatively high concentrations and in a dose-dependent manner. 3-Hydroxyflavone, luteolin, and apigenin were more toxic toward TIG-1 cells than the other flavonoids, and luteolin, 3-hydroxyflavone, and quercetin were more toxic toward HUVE cells. HUVE cells were more vulnerable to flavonoid cytotoxicity than TIG-1 cells. Using 2',7'-dichlorofluorescin diacetate (DCF-DA), the intracellular reactive oxygen species (ROS) level of flavonoid-treated TIG-1 cells was examined. The ROS level increased significantly in the presence of the flavone apigenin or luteolin or the flavonol 3-hydroxyflavone, quercetin, or kaempherol. These results suggest that these flavones and flavonols exert cytotoxicity through increasing intracellular ROS levels. Further, the incorporation of apigenin, 3-hydroxyflavone, luteolin, and quercetin, which are more toxic, into TIG-1 cells during 24-h incubation was examined. These flavonoids were incorporated into them and the order of their incorporation efficiency was similar to that of their cytotoxicity. In conclusion, some flavonoids are cytotoxic at higher concentrations toward human normal cells. Further, it is suggested that they are incorporated into cells, increase intracellular ROS levels, and then exert cytotoxicity.
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Affiliation(s)
- Mitsuyoshi Matsuo
- Department of Biology, Faculty of Science, Konan University, 8-9-1 Okamoto, Higashinada-ku, Kobe 658-8501, Japan.
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Godley BF, Shamsi FA, Liang FQ, Jarrett SG, Davies S, Boulton M. Blue Light Induces Mitochondrial DNA Damage and Free Radical Production in Epithelial Cells. J Biol Chem 2005; 280:21061-6. [PMID: 15797866 DOI: 10.1074/jbc.m502194200] [Citation(s) in RCA: 283] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Exposure of biological chromophores to ultraviolet radiation can lead to photochemical damage. However, the role of visible light, particularly in the blue region of the spectrum, has been largely ignored. To test the hypothesis that blue light is toxic to non-pigmented epithelial cells, confluent cultures of human primary retinal epithelial cells were exposed to visible light (390-550 nm at 2.8 milliwatts/cm2) for up to 6 h. A small loss of mitochondrial respiratory activity was observed at 6 h compared with dark-maintained cells, and this loss became greater with increasing time. To investigate the mechanism of cell loss, the damage to mitochondrial and nuclear genes was assessed using the quantitative PCR. Light exposure significantly damaged mitochondrial DNA at 3 h (0.7 lesion/10 kb DNA) compared with dark-maintained controls. However, by 6 h of light exposure, the number of lesions was decreased in the surviving cells, indicating DNA repair. Isolated mitochondria exposed to light generated singlet oxygen, superoxide anion, and the hydroxyl radical. Antioxidants confirmed the superoxide anion to be the primary species responsible for the mitochondrial DNA lesions. The effect of lipofuscin, a photoinducible intracellular generator of reactive oxygen intermediates, was investigated for comparison. Exposure of lipofuscin-containing cells to visible light caused an increase in both mitochondrial and nuclear DNA lesions compared with non-pigmented cells. We conclude that visible light can cause cell dysfunction through the action of reactive oxygen species on DNA and that this may contribute to cellular aging, age-related pathologies, and tumorigenesis.
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Furuya H, Shinnoh N, Ohyagi Y, Ikezoe K, Kikuchi H, Osoegawa M, Fukumaki Y, Nakabeppu Y, Hayashi T, Kira JI. Some flavonoids and DHEA-S prevent the cis-effect of expanded CTG repeats in a stable PC12 cell transformant. Biochem Pharmacol 2005; 69:503-16. [PMID: 15652241 DOI: 10.1016/j.bcp.2004.10.005] [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] [Received: 07/09/2004] [Accepted: 10/20/2004] [Indexed: 01/03/2023]
Abstract
Expanded CUG triplet repeats carrying mRNA seem to be responsible for myotonic dystrophy type 1 (DM1). To study the pathogenesis of DM1, we constructed a DM1 cell culture model using a PC12 neuronal cell line and screened flavonoids that ameliorate this mRNA gain of function. The expanded 250 CTG repeat was subcloned into the 3'-untranslated region of the luciferase gene yielding a stable transformant of PC12 (CTG-250). The cytotoxicity of CTG-250 was evaluated by intracellular LDH activity, and the cis-effect by luciferase activity. To find agents that alter CTG-250 toxic effects, 235 bioflavonoids were screened. An increased cis-effect and cytotoxicity were found when CTG-250 was treated with nerve growth factor to induce differentiation. Western blotting with anti-caspase-3 antibody suggested that cell death was caused by apoptosis. Screening analysis confirmed that a flavone (toringin), an isoflavones (genistein and formononetin), a flavanone (isosakuranetin), and DHEA-S prevent both the cytotoxicity and cis-effect of CTG-250 and that a flavanone (naringenin), isoflavone (ononin), and xanthylatin strongly inhibit the cis-effect of CTG repeats. In conclusion, we found that this neuronal cell line, which expresses the CUG repeat-bearing mRNA, showed cis-effects through the reporter gene and neuronal death after cell differentiation in vitro. However, some flavonoids and DHEA-S inhibit both the cis-effect and cytotoxicity, indicating that their chemical structures work to ameliorate both these toxic effects. This system makes it easy to evaluate the toxic effects of expanded CTG repeats and therefore should be useful for screening other DM1 treatments for their efficacies.
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Affiliation(s)
- Hirokazu Furuya
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan.
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