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Zhang CF, Zhang SL, He X, Yang XL, Wu HT, Lin BQ, Jiang CP, Wang J, Yu CH, Yang ZL, Wang CZ, Li P, Yuan CS. Antioxidant effects of Genkwa flos flavonoids on Freund׳s adjuvant-induced rheumatoid arthritis in rats. JOURNAL OF ETHNOPHARMACOLOGY 2014; 153:793-800. [PMID: 24685587 DOI: 10.1016/j.jep.2014.03.046] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Revised: 03/17/2014] [Accepted: 03/19/2014] [Indexed: 05/28/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Genkwa flos (Daphne genkwa Sieb. et Zucc.), a Chinese herbal medicine, has been traditionally used for over two thousand years in China for inflammation related symptoms, including joint pain. To evaluate the antioxidative effects of flavonoid aglycones (FA) isolated from Genkwa flos on adjuvant arthritis in rats and to identify the relationship between antioxidant potential and whole blood viscosity (WBV). MATERIALS AND METHODS FA compounds were identified using LC-MS and the content was assayed by HPLC. Arthritis was induced by an intradermal injection of Freund׳s complete adjuvant in the footpad. The effects of FA on paw volumes, secondary arthritis scores, histopathology of joints, and body and organ weights were measured. The antioxidant effects of FA and WBV were determined. RESULTS LC-MS analysis showed that the FA contained four major compounds: luteolin, apigenin, hydroxygenkwanin and genkwanin. FA significantly decreased paw edema, arthritis scores, and weight loss. These observations were consistent with the reduction of oxidative stress and the improvement of the WBV. CONCLUSION FA significantly decreased arthritis in a rat model through antioxidant and hemorheological modulatory mechanisms. The Genkwa flos flavonoids may have clinical potential for the treatment of rheumatoid arthritis.
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Affiliation(s)
- Chun-Feng Zhang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, No. 24 Tongjia Lane, Nanjing 210009, China; Tang Center of Herbal Medicine and Department of Anesthesia & Critical Care, University of Chicago, Chicago 60637, USA.
| | - Su-Li Zhang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, No. 24 Tongjia Lane, Nanjing 210009, China
| | - Xin He
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210000, China
| | - Xiao-Lin Yang
- Guangdong Provincial Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs Research, Jinan University, Guangzhou 510632, China
| | - Hai-Tao Wu
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, No. 24 Tongjia Lane, Nanjing 210009, China
| | - Bao-Qin Lin
- Department of Pharmacology, School of Chinese Materia Medica, Guangzhou University of Chinese Medicine, Guangzhou 510006, China
| | - Cui-Ping Jiang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, No. 24 Tongjia Lane, Nanjing 210009, China
| | - Jun Wang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, No. 24 Tongjia Lane, Nanjing 210009, China
| | - Chun-Hao Yu
- Tang Center of Herbal Medicine and Department of Anesthesia & Critical Care, University of Chicago, Chicago 60637, USA
| | - Zhong-Lin Yang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, No. 24 Tongjia Lane, Nanjing 210009, China
| | - Chong-Zhi Wang
- Tang Center of Herbal Medicine and Department of Anesthesia & Critical Care, University of Chicago, Chicago 60637, USA
| | - Ping Li
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, No. 24 Tongjia Lane, Nanjing 210009, China
| | - Chun-Su Yuan
- Tang Center of Herbal Medicine and Department of Anesthesia & Critical Care, University of Chicago, Chicago 60637, USA
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152
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Zhang T, Wu W, Li D, Xu T, Zhu H, Pan D, Zhu S, Liu Y. Anti-oxidant and anti-apoptotic effects of luteolin on mice peritoneal macrophages stimulated by angiotensin II. Int Immunopharmacol 2014; 20:346-51. [PMID: 24726243 DOI: 10.1016/j.intimp.2014.03.018] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Revised: 02/10/2014] [Accepted: 03/25/2014] [Indexed: 01/12/2023]
Abstract
PURPOSE Luteolin, a plant flavonoid, can be found in a variety of plants and possesses anti-tumorigenic, anti-mutagenic, anti-oxidant and anti-inflammatory properties. However, the protective effects of luteolin on mice peritoneal macrophages stimulated by Angiotensin II (Ang II) have not been fully elucidated. METHODS AND RESULTS Mice peritoneal macrophages were confirmed to be strongly positive for the macrophage marker CD68. Cell viability was tested after cells were pretreated with different concentrations of luteolin (6.25, 12.5 and 25μM) and stimulated by Ang II. Luteolin not only significantly increased the viability of macrophages in the presence of Ang II, but also decreased the apoptotic rate, up-regulated Bcl-2 expression, and down-regulated Bax expression, thereby raising the ratio of Bcl-2 to Bax. In addition, luteolin pretreatment significantly increased the activity of SOD and reduced the levels of malondialdehyde (MDA), which was up-regulated in the presence of Ang II. This protective effect was also seen with Vitamin E (VitE) pretreatment, which was used as a standard control in this study. CONCLUSIONS These data clearly demonstrate that luteolin suppresses Ang II-directed oxidative stress and apoptosis on mice peritoneal macrophages.
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Affiliation(s)
- Tian Zhang
- Institute of Cardiovascular Disease Research, Xuzhou Medical College, Xuzhou, Jiangsu, PR China
| | - Wanling Wu
- Department of Cardiology, The Affiliated Hospital of Xuzhou Medical College, Xuzhou, Jiangsu, PR China
| | - Dongye Li
- Institute of Cardiovascular Disease Research, Xuzhou Medical College, Xuzhou, Jiangsu, PR China; Department of Cardiology, The Affiliated Hospital of Xuzhou Medical College, Xuzhou, Jiangsu, PR China.
| | - Tongda Xu
- Department of Cardiology, The Affiliated Hospital of Xuzhou Medical College, Xuzhou, Jiangsu, PR China
| | - Hong Zhu
- Department of Cardiology, The Affiliated Hospital of Xuzhou Medical College, Xuzhou, Jiangsu, PR China
| | - Defeng Pan
- Department of Cardiology, The Affiliated Hospital of Xuzhou Medical College, Xuzhou, Jiangsu, PR China
| | - Shasha Zhu
- Institute of Cardiovascular Disease Research, Xuzhou Medical College, Xuzhou, Jiangsu, PR China
| | - Yang Liu
- Institute of Cardiovascular Disease Research, Xuzhou Medical College, Xuzhou, Jiangsu, PR China
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153
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Jeong D, Yi YS, Sung GH, Yang WS, Park JG, Yoon K, Yoon DH, Song C, Lee Y, Rhee MH, Kim TW, Kim JH, Cho JY. Anti-inflammatory activities and mechanisms of Artemisia asiatica ethanol extract. JOURNAL OF ETHNOPHARMACOLOGY 2014; 152:487-496. [PMID: 24503036 DOI: 10.1016/j.jep.2014.01.030] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 01/25/2014] [Accepted: 01/27/2014] [Indexed: 06/03/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Artemisia asiatica Nakai (Compositae) is a representative herbal plant used to treat infection and inflammatory diseases. Although Artemisia asiatica is reported to have immunopharmacological activities, the mechanisms of these activities and the effectiveness of Artemisia asiatica preparations in use are not known. MATERIALS AND METHODS To evaluate the anti-inflammatory activities of Artemisia asiatica ethanol extract (Aa-EE), we assayed nitric oxide (NO), tumor necrosis factor (TNF)-α, and prostaglandin E2 (PGE2) in macrophages and measured the extent of tissue injury in a model of gastric ulcer induced in mice by treatment with HCl in EtOH. Putative enzymatic mediators of Aa-EE activities were identified by nuclear fractionation, reporter gene assay, immunoprecipitation, immunoblotting, and kinase assay. Active compound in Aa-EE was identified using HPLC. RESULTS Treatment of RAW264.7 cells and peritoneal macrophages with Aa-EE suppressed the production of NO, PGE2, and TNF-α in response to lipopolysaccharide (LPS) and induced heme oxygenase-1 expression. The Aa-EE also ameliorated symptoms of gastric ulcer in HCl/EtOH-treated mice. These effects were associated with the inhibition of nuclear translocation of nuclear factor (NF)-κB and activator protein (AP)-1, implying that the anti-inflammatory action of the Aa-EE occurred through transcriptional inhibition. The upstream regulatory signals Syk and Src for translocation of NF-κB and TRAF6 for AP-1 were identified as targets of this effect. Analysis of Aa-EE by HPLC revealed the presence of luteolin, known to inhibit NO and PGE2 activity. CONCLUSION The anti-inflammatory activities attributed to Artemisia asiatica Nakai in traditional medicine may be mediated by luteolin through inhibition of Src/Syk/NF-κB and TRAF6/JNK/AP-1 signaling pathways.
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Affiliation(s)
- Deok Jeong
- Department of Genetic Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea
| | - Young-Su Yi
- Department of Genetic Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea
| | - Gi-Ho Sung
- Department of Herbal Crop Research, National Institutes of Horticultural & Herbal Science, Rural Development Administration, Suwon 441-707, Korea
| | - Woo Seok Yang
- Department of Genetic Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea
| | - Jae Gwang Park
- Department of Genetic Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea
| | - Keejung Yoon
- Department of Genetic Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea
| | - Deok Hyo Yoon
- Department of Biochemistry, Kangwon National University, Chuncehon 200-701, Republic of Korea
| | - Changsik Song
- Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Republic of Korea
| | - Yunmi Lee
- Department of Chemistry, Kwangwoon University, Seoul 139-701, Republic of Korea
| | - Man Hee Rhee
- College of Veterinary Medicine, Kyungpook National University, Daegu 702-701, Republic of Korea
| | - Tae Woong Kim
- Department of Biochemistry, Kangwon National University, Chuncehon 200-701, Republic of Korea
| | - Jong-Hoon Kim
- Department of Veterinary Physiology, College of Veterinary Medicine, Biosafety Research Institute, Chonbuk National University, Jeonju 561-756, Republic of Korea.
| | - Jae Youl Cho
- Department of Genetic Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
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154
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Ding Y, Shi X, Shuai X, Xu Y, Liu Y, Liang X, Wei D, Su D. Luteolin prevents uric acid-induced pancreatic β-cell dysfunction. J Biomed Res 2014; 28:292-8. [PMID: 25050113 PMCID: PMC4102843 DOI: 10.7555/jbr.28.20130170] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Revised: 12/07/2013] [Accepted: 01/16/2014] [Indexed: 11/24/2022] Open
Abstract
Elevated uric acid causes direct injury to pancreatic β-cells. In this study, we examined the effects of luteolin, an important antioxidant, on uric acid-induced β-cell dysfunction. We first evaluated the effect of luteolin on nitric oxide (NO) formation in uric acid-stimulated Min6 cells using the Griess method. Next, we performed transient transfection and reporter assays to measure transcriptional activity of nuclear factor (NF)-κB. Western blotting assays were also performed to assess the effect of luteolin on the expression of MafA and inducible NO synthase (iNOS) in uric acid-treated cells. Finally, we evaluated the effect of luteolin on uric acid-induced inhibition of glucose-stimulated insulin secretion (GSIS) in Min6 cells and freshly isolated mouse pancreatic islets. We found that luteolin significantly inhibited uric acid-induced NO production, which was well correlated with reduced expression of iNOS mRNA and protein. Furthermore, decreased activity of NF-κB was implicated in inhibition by luteolin of increased iNOS expression induced by uric acid. Besides, luteolin significantly increased MafA expression in Min6 cells exposed to uric acid, which was reversed by overexpression of iNOS. Moreover, luteolin prevented uric acid-induced inhibition of GSIS in both Min6 cells and mouse islets. In conclusion, luteolin protects pancreatic β-cells from uric acid-induced dysfunction and may confer benefit on the protection of pancreatic β-cells in hyperuricemia-associated diabetes.
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Affiliation(s)
- Ying Ding
- Center of Metabolic Disease Research, Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Xuhui Shi
- Center of Metabolic Disease Research, Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Xuanyu Shuai
- Center of Metabolic Disease Research, Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Yuemei Xu
- Center of Metabolic Disease Research, Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Yun Liu
- Center of Metabolic Disease Research, Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Xiubin Liang
- Center of Metabolic Disease Research, Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Dong Wei
- Department of Endocrinology, the Second People's Hospital of Chengdu, Sichuan 610017, China
| | - Dongming Su
- Center of Metabolic Disease Research, Nanjing Medical University, Nanjing, Jiangsu 210029, China. ; Center of Cellular Therapy, the Second Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, China
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155
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Kim HJ, Lee W, Yun JM. Luteolin inhibits hyperglycemia-induced proinflammatory cytokine production and its epigenetic mechanism in human monocytes. Phytother Res 2014; 28:1383-91. [PMID: 24623679 DOI: 10.1002/ptr.5141] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Revised: 01/26/2014] [Accepted: 02/16/2014] [Indexed: 12/26/2022]
Abstract
Hyperglycemia is a key feature in diabetes. Hyperglycemia has been implicated as a major contributor to several complications of diabetes. High glucose levels induce the release of proinflammatory cytokines. Luteolin is a flavone isolated from celery, green pepper, perilla leaf, and chamomile tea. Luteolin has been reported to possess antimutagenic, antitumorigenic, antioxidant, and anti-inflammatory properties. In this study, we investigated the effects of luteolin on proinflammatory cytokine secretion and its underlying epigenetic regulation in high-glucose-induced human monocytes. Human monocytic (THP-1) cells were cultured under controlled (14.5 mM mannitol), normoglycemic (NG, 5.5 mM glucose), or hyperglycemic (HG, 20 mM glucose) conditions, in the absence or presence of luteolin. Luteolin (3-10 μM) was added for 48 h. While hyperglycemic conditions significantly induced histone acetylation, NF-κB activation, and proinflammatory cytokine (IL-6 and TNF-α) release from THP-1 cells, luteolin suppressed NF-κB activity and cytokine release. Luteolin also significantly reduced CREB-binding protein/p300 (CBP/p300) gene expression, as well as the levels of acetylation and histone acetyltransferase (HAT) activity of the CBP/p300 protein, which is a known NF-κB coactivator. These results suggest that luteolin inhibits HG-induced cytokine production in monocytes, through epigenetic changes involving NF-κB. We therefore suggest that luteolin may be a potential candidate for the treatment and prevention of diabetes and its complications.
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Affiliation(s)
- Hye Joo Kim
- Pharmacology Research Center, Korea Research Institute of Chemical Technology, Daejeon, 305-600, South Korea
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156
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Trotta T, Porro C, Calvello R, Panaro MA. Biological role of Toll-like receptor-4 in the brain. J Neuroimmunol 2014; 268:1-12. [PMID: 24529856 DOI: 10.1016/j.jneuroim.2014.01.014] [Citation(s) in RCA: 152] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Revised: 12/12/2013] [Accepted: 01/28/2014] [Indexed: 01/07/2023]
Abstract
The Toll-like receptors (TLRs) are a family of microbe-sensing receptors that play a central role in the regulation of the host immune system. TLR4 has been described in the brain and seems to regulate some physiological processes, such as neurogenesis. TLR4 has also been reported to play a role during neurodegenerative disorders, including Alzheimer's disease, amyotrophic lateral sclerosis, multiple sclerosis and Parkinson's disease. This review is focused on reports concerning recent insights into the role and activation mechanisms of TLR4 in the brain, in pathological and physiological conditions, as well as the therapeutic benefit that could derive from TLR4 modulation.
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Affiliation(s)
- Teresa Trotta
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy.
| | - Chiara Porro
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Rosa Calvello
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - Maria Antonietta Panaro
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
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157
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Reipas KM, Law JH, Couto N, Islam S, Li Y, Li H, Cherkasov A, Jung K, Cheema AS, Jones SJM, Hassell JA, Dunn SE. Luteolin is a novel p90 ribosomal S6 kinase (RSK) inhibitor that suppresses Notch4 signaling by blocking the activation of Y-box binding protein-1 (YB-1). Oncotarget 2014; 4:329-45. [PMID: 23593654 PMCID: PMC3712578 DOI: 10.18632/oncotarget.834] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Triple-negative breast cancers (TNBC) are notoriously difficult to treat because they lack hormone receptors and have limited targeted therapies. Recently, we demonstrated that p90 ribosomal S6 kinase (RSK) is essential for TNBC growth and survival indicating it as a target for therapeutic development. RSK phosphorylates Y-box binding protein-1 (YB-1), an oncogenic transcription/translation factor, highly expressed in TNBC (~70% of cases) and associated with poor prognosis, drug resistance and tumor initiation. YB-1 regulates the tumor-initiating cell markers, CD44 and CD49f however its role in Notch signaling has not been explored. We sought to identify novel chemical entities with RSK inhibitory activity. The Prestwick Chemical Library of 1120 off-patent drugs was screened for RSK inhibitors using both in vitro kinase assays and molecular docking. The lead candidate, luteolin, inhibited RSK1 and RSK2 kinase activity and suppressed growth in TNBC, including TIC-enriched populations. Combining luteolin with paclitaxel increased cell death and unlike chemotherapy alone, did not enrich for CD44+ cells. Luteolin’s efficacy against drug-resistant cells was further indicated in the primary x43 cell line, where it suppressed monolayer growth and mammosphere formation. We next endeavored to understand how the inhibition of RSK/YB-1 signaling by luteolin elicited an effect on TIC-enriched populations. ChIP-on-ChIP experiments in SUM149 cells revealed a 12-fold enrichment of YB-1 binding to the Notch4 promoter. We chose to pursue this because there are several reports indicating that Notch4 maintains cells in an undifferentiated, TIC state. Herein we report that silencing YB-1 with siRNA decreased Notch4 mRNA. Conversely, transient expression of Flag:YB-1WT or the constitutively active mutant Flag:YB-1D102 increased Notch4 mRNA. The levels of Notch4 transcript and the abundance of the Notch4 intracellular domain (N4ICD) correlated with activation of P-RSKS221/7 and P-YB-1S102 in a panel of TNBC cell lines. Silencing YB-1 or RSK reduced Notch4 mRNA and this corresponded with loss of N4ICD. Likewise, the RSK inhibitors, luteolin and BI-D1870, suppressed P-YB-1 S102 and thereby reduced Notch4. In conclusion, inhibiting the RSK/YB-1 pathway with luteolin is a novel approach to blocking Notch4 signaling and as such provides a means of inhibiting TICs.
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Affiliation(s)
- Kristen M Reipas
- Laboratory for Oncogenomic Research, Child and Family Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
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158
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Song YS, Park CM. Luteolin and luteolin-7-O-glucoside strengthen antioxidative potential through the modulation of Nrf2/MAPK mediated HO-1 signaling cascade in RAW 264.7 cells. Food Chem Toxicol 2013; 65:70-5. [PMID: 24361407 DOI: 10.1016/j.fct.2013.12.017] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Revised: 11/22/2013] [Accepted: 12/13/2013] [Indexed: 12/13/2022]
Abstract
It has been understood that glycosidic forms of flavonoids were hydrolyzed by gut bacteria and absorbed as aglycones. However, several reports suggested that glycosides were partly absorbed without hydrolysis and remained biologically active. In this study, we evaluated the antioxidative potential of luteolin and luteolin-7-O-glucoside, glycosidic form of luteolin, against the oxidative damage and compared their antioxidative mechanisms in RAW 264.7 cells. Heme oxygenase-1 (HO-1), one of the phase II enzymes showing an antioxidative activity, was potently induced by luteolin and luteolin-7-O-glucoside treatment, which was in accordance with the translocated nuclear factor-erythroid 2 p45-related factor 2 (Nrf2) into nucleus. Moreover, luteolin and the luteolin-7-O-glucoside activated HO-1 expression by p38 and c-Jun NH2-terminal kinase (JNK) regulation. In order to identify the antioxidation potential by HO-1, tert-butyl hydroperoxide (t-BHP)-induced oxidative damage was applied and ameliorated by luteolin and the luteolin-7-O-glucoside treatment in a dose dependent manner, which was confirmed by HO-1 selective inhibitor and inducer, tin protoporphyrin (SnPP) and cobalt protoporphyrin (CoPP), respectively. Consequently, luteolin and luteolin-7-O-glucoside potently strengthen the HO-1-mediated antioxidative potential through the modulation of the Nrf2/MAPK signaling pathways.
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Affiliation(s)
- Young Sun Song
- Department of Smart Foods and Drugs, Inje University, Gimhae, Gyeongnam, Republic of Korea
| | - Chung Mu Park
- Department of Clinical Laboratory Science, Dong-Eui University, Busan, Republic of Korea.
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159
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Park CM, Song YS. Luteolin and luteolin-7-O-glucoside inhibit lipopolysaccharide-induced inflammatory responses through modulation of NF-κB/AP-1/PI3K-Akt signaling cascades in RAW 264.7 cells. Nutr Res Pract 2013; 7:423-9. [PMID: 24353826 PMCID: PMC3865263 DOI: 10.4162/nrp.2013.7.6.423] [Citation(s) in RCA: 101] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Revised: 07/12/2013] [Accepted: 09/02/2013] [Indexed: 12/17/2022] Open
Abstract
Luteolin is a flavonoid found in abundance in celery, green pepper, and dandelions. Previous studies have shown that luteolin is an anti-inflammatory and anti-oxidative agent. In this study, the anti-inflammatory capacity of luteolin and one of its glycosidic forms, luteolin-7-O-glucoside, were compared and their molecular mechanisms of action were analyzed. In lipopolysaccharide (LPS)-activated RAW 264.7 cells, luteolin more potently inhibited the production of nitric oxide (NO) and prostaglandin E2 as well as the expression of their corresponding enzymes (inducible NO synthase (iNOS) and cyclooxygenase-2 (COX-2) than luteolin-7-O-glucoside. The molecular mechanisms underlying these effects were investigated to determine whether the inflammatory response was related to the transcription factors, nuclear factor (NF)-κB and activator protein (AP)-1, or their upstream signaling molecules, mitogen-activated protein kinases (MAPKs) and phosphoinositide 3-kinase (PI3K). Luteolin attenuated the activation of both transcription factors, NF-κB and AP-1, while luteolin-7-O-glucoside only impeded NF-κB activation. However, both flavonoids inhibited Akt phosphorylation in a dose-dependent manner. Consequently, luteolin more potently ameliorated LPS-induced inflammation than luteolin-7-O-glucoside, which might be attributed to the differentially activated NF-κB/AP-1/PI3K-Akt pathway in RAW 264.7 cells.
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Affiliation(s)
- Chung Mu Park
- Department of Clinical Laboratory Science, Dong-Eui University, Busan 614-714, Korea
| | - Young-Sun Song
- Department of Smart Foods and Drugs, Inje University, 607 Obang-dong, Gimhae, Gyeongnam 621-749, Korea
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160
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Nishitani Y, Yamamoto K, Yoshida M, Azuma T, Kanazawa K, Hashimoto T, Mizuno M. Intestinal anti-inflammatory activity of luteolin: role of the aglycone in NF-κB inactivation in macrophages co-cultured with intestinal epithelial cells. Biofactors 2013; 39:522-33. [PMID: 23460110 DOI: 10.1002/biof.1091] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2012] [Accepted: 12/21/2012] [Indexed: 12/24/2022]
Abstract
The flavonoid luteolin is reported to exert anti-inflammatory properties. In this study, we investigated whether luteolin inhibits gut inflammation, using in vivo and in vitro inflammation models. In a dextran sulfate sodium (DSS)-induced colitis mouse model, luteolin (20 and 50 mg/kg) significantly ameliorated shortening of colon length and histological score. Immunohistochemical analysis showed that luteolin also significantly inhibited infiltration of macrophages and interferon (IFN)-γ-producing CD4⁺ T cells into the colonic mucosa. Treatment with luteolin also improved IFN-γ mRNA expression in the colon. At the cellular level, a co-culture consisting of intestinal epithelial Caco-2 and macrophage RAW264.7 cells, stimulated with lipopolysaccharide, the addition of luteolin (100 μM) suppressed interleukin (IL)-8 mRNA expression in Caco-2 cells without epithelial monolayer disruption. Expression of tumor necrosis factor (TNF)-α protein and proinflammatory cytokines mRNA (TNF-α, IL-6, and IL-1β) in RAW264.7 cells were also suppressed. HPLC analysis and subsequent cellular assay revealed that aglycone of luteolin was present in the basolateral supernatant of this system at a sufficient concentration to suppress TNF-α production and nuclear factor (NF)-κB activation of RAW264.7 cells. These results suggest that the luteolin aglycones released from the Caco-2 epithelium inhibits NF-κB nuclear translocation in RAW264.7 cells, followed by reduction of TNF-α mRNA expression, which results in downregulation of IL-8 mRNA expression in Caco-2 cells. The mechanism by which aglycone inhibits inflammation is important for understanding the roles of luteolin in diet.
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Affiliation(s)
- Yosuke Nishitani
- Organization of Advanced Science and Technology, Kobe University, Rokkodai-cho 1-1, Nada-ku, Kobe 657-8501, Japan
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161
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5-Hydroxy-3,6,7,8,3′4′-hexamethoxyflavone inhibits nitric oxide production in lipopolysaccharide-stimulated BV2 microglia via NF-κB suppression and Nrf-2-dependent heme oxygenase-1 induction. Food Chem Toxicol 2013; 57:119-25. [DOI: 10.1016/j.fct.2013.03.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2013] [Revised: 02/28/2013] [Accepted: 03/18/2013] [Indexed: 01/23/2023]
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162
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Francisco V, Costa G, Figueirinha A, Marques C, Pereira P, Miguel Neves B, Celeste Lopes M, García-Rodríguez C, Teresa Cruz M, Teresa Batista M. Anti-inflammatory activity of Cymbopogon citratus leaves infusion via proteasome and nuclear factor-κB pathway inhibition: contribution of chlorogenic acid. JOURNAL OF ETHNOPHARMACOLOGY 2013; 148:126-134. [PMID: 23583902 DOI: 10.1016/j.jep.2013.03.077] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Revised: 03/22/2013] [Accepted: 03/28/2013] [Indexed: 06/02/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Cymbopogon citratus (DC.) Stapf leaves infusion is used in traditional medicine for the treatment of inflammatory conditions, however little is known about their bioactive compounds. AIM OF THE STUDY Investigate the compounds responsible for anti-inflammatory potential of Cymbopogon citratus (Cy) on cytokines production induced by lipopolysaccharide (LPS) in human and mouse macrophages, and the action mechanisms involved. MATERIALS AND METHODS An essential oil-free infusion of Cy was prepared and polyphenol-rich fractions (PFs) were obtained from it by column chromatography. Chlorogenic acid (CGA) was identified, by HPLC/PDA/ESI-MS(n). The expression of cytokines, namely TNF-α and CCL5, was analyzed by real-time RT-PCR, on LPS-stimulated human macrophages. Activation of nuclear factor (NF)-κB, a master regulator of inflammation, was investigated by western blot and gene reporter assay. Proteasome activity was assessed using a fluorogenic peptide. RESULTS Cymbopogon citratus extract and its polyphenols inhibited the cytokine production on human macrophages. This supports the anti-inflammatory activity of Cy polyphenols in physiologically relevant cells. Concerning the effect on the activation of NF-κB pathway, the results pointed to an inhibition of LPS-induced NF-κB activation by Cy and PFs. CGA was identified, by HPLC/PDA/ESI-MS(n), as the main phenolic acid of the Cy infusion, and it demonstrated to be, at least in part, responsible by that effect. Additionally, it was verified for the first time that Cy and PFs inhibited the proteasome activity, a complex that controls NF-κB activation, having CGA a strong contribution. CONCLUSIONS The results evidenced, for the first time, the anti-inflammatory properties of Cymbopogon citratus through proteasome inhibition and, consequently NF-κB pathway and cytokine expression. Additionally, Cy polyphenols, in particular chlorogenic acid, were highlighted as bioactive compounds.
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Affiliation(s)
- Vera Francisco
- Center for Neurosciences and Cell Biology, University of Coimbra, Azinhaga de Santa Comba, 3004-517 Coimbra, Portugal
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Kim HJ, Jun JG, Kim JK. 2-(4-Hydroxyphenyl)-5-(3-Hydroxypropenyl)-7-Methoxybenzofuran, a Novel Ailanthoidol Derivative, Exerts Anti-Inflammatory Effect through Downregulation of Mitogen-Activated Protein Kinase in Lipopolysaccharide-Treated RAW 264.7 Cells. THE KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY : OFFICIAL JOURNAL OF THE KOREAN PHYSIOLOGICAL SOCIETY AND THE KOREAN SOCIETY OF PHARMACOLOGY 2013; 17:217-22. [PMID: 23776398 PMCID: PMC3682082 DOI: 10.4196/kjpp.2013.17.3.217] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 04/17/2013] [Accepted: 05/02/2013] [Indexed: 12/31/2022]
Abstract
We reported that ailanthoidol, a neolignan from Zanthoxylum ailanthoides and Salvia miltiorrhiza Bunge, inhibited inflammatory reactions by macrophages and protected mice from endotoxin shock. We examined the anti-inflammatory activity of six synthetic ailanthoidol derivatives (compounds 1-6). Among them, compound 4, 2-(4-hydroxyphenyl)-5-(3-hydroxypropenyl)-7-methoxybenzofuran, had the lowest IC50 value concerning nitric oxide (NO) release from lipopolysaccharide (LPS)-stimulated RAW264.7 cells. Compound 4 suppressed the generation of prostaglandin (PG) E2 and the expression of inducible NO synthase and cyclooxygenase (COX)-2 induced by LPS, and inhibited the release of LPS-induced pro-inflammatory cytokines from RAW264.7 cells. The underlying mechanism of compound 4 on anti-inflammatory action was correlated with the down-regulation of mitogen-activated protein kinase and activator protein-1 activation. Compound 4 is potentially an effective functional chemical candidate for the prevention of inflammatory diseases.
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Affiliation(s)
- Hyeon Jin Kim
- Department of Biomedical Science, College of Natural Science, Catholic University of Daegu, Gyeongsan 700-712, Korea
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164
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Dietary flavonoids as therapeutics for preterm birth: luteolin and kaempferol suppress inflammation in human gestational tissues in vitro. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2013; 2013:485201. [PMID: 23840918 PMCID: PMC3687483 DOI: 10.1155/2013/485201] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Accepted: 05/20/2013] [Indexed: 11/26/2022]
Abstract
Infection/inflammation is commonly associated with preterm birth (PTB), initiating uterine contractions and rupture of fetal membranes. Proinflammatory cytokines induce matrix metalloproteinases (MMPs) that degrade the extracellular matrix (ECM) and prostaglandins which initiate uterine contractions. Nuclear factor-κB (NF-κB) and activator-protein- (AP-)1 have key roles in the formation of these prolabour mediators. In nongestational tissues, dietary flavonoids such as luteolin and kaempferol inhibit NF-κB, AP-1, and their downstream targets. The aim of this study was to determine if luteolin and kaempferol reduce infection-induced prolabour mediators in human gestational tissues. Fetal membranes were incubated with LPS, and primary amnion cells and myometrial cells were incubated with IL-1β in the absence or presence of luteolin or kaempferol. Luteolin and kaempferol significantly reduced LPS-induced secretion of proinflammatory cytokines (IL-6 and IL-8) and prostaglandins (PGE2 and PGF2α) in fetal membranes, IL-1β-induced COX-2 gene expression and prostaglandin production in myometrium, and IL-1β-induced MMP-9 activity in amnion and myometrial cells. Luteolin and kaempferol decreased IL-1β-induced NF-κB p65 DNA binding activity and nuclear c-Jun expression. In conclusion, luteolin and kaempferol inhibit prolabour mediators in human gestational tissues. Given the central role of inflammation in provoking preterm labour, phytophenols may be a therapeutic approach to reduce the incidence of PTB.
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165
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Kim TH, Li H, Wu Q, Lee HJ, Ryu JH. A new labdane diterpenoid with anti-inflammatory activity from Thuja orientalis. JOURNAL OF ETHNOPHARMACOLOGY 2013; 146:760-767. [PMID: 23422333 DOI: 10.1016/j.jep.2013.02.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Revised: 01/30/2013] [Accepted: 02/02/2013] [Indexed: 06/01/2023]
Abstract
UNLABELLED ETHONOPHARMACOLOGICAL RELEVANCE: Thuja orientalis (L) ENDL (Cupressaceae) is an evergreen arbor that is distributed throughout Northeast Asia. This plant has been used as a traditional medicine for the treatment of various inflammatory diseases such as dermatitis, gout and chronic tracheitis. AIM OF THE STUDY To isolate the active principles responsible for the anti-inflammatory activities of Thuja orientalis and to disclose their mechanism of action in lipopolysaccharide (LPS)-stimulated macrophages. MATERIALS AND METHODS The methanolic leaves and stem extracts of the Thuja orientalis were successively fractionated into EtOAc, n-BuOH and the remaining aqueous fractions. The EtOAc soluble fraction, which exhibited significant inhibitory activity on LPS-induced nitric oxide (NO) production, was followed by successive activity-guided chromatography to yield seven diterpenoids. The anti-inflammatory properties of active constituents were evaluated by RT-PCR, Western blotting and reporter gene assay in cell culture system. RESULTS A new labdane diterpene, 15-nor-14-oxolabda-8(17),13(16)-dien-19-oic acid (1), and six known diterpenoids (2-7) were isolated from the EtOAc extracts of Thuja orientalis. The isolated compounds 1-7 were evaluated for the inhibitory activity of LPS-induced NO production in RAW264.7 macrophage cells. Compound 1 was the most potent among the isolated compounds for the inhibition of LPS-induced NO production (IC501: 3.56μM). Compound 1 reduced the production of pro-inflammatory mediators and suppressed the expression of the inflammatory enzymes of iNOS and COX-2. In addition, compound 1 attenuated the LPS-induced transcriptional activity of NF-κB by the inhibition of inhibitory-κBα degradation, and suppressed the activity of extracellular signal regulated kinase (ERK). CONCLUSIONS This study demonstrates that a new labdane diterpene from Thuja orientalis inhibits the inflammatory responses by the suppression of NF-κB activity and ERK phosphorylation. This compound might be a valuable candidate for the development of anti-inflammatory drugs.
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Affiliation(s)
- Tae-Hee Kim
- Research Center for Cell Fate Control and College of Pharmacy, Sookmyung Women's University, Yongsan-Gu, Seoul 140-742, Republic of Korea
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Orhan F, Gulluce M, Ozkan H, Alpsoy L. Determination of the antigenotoxic potencies of some luteolin derivatives by using a eukaryotic cell system, Saccharomyces cerevisiae. Food Chem 2013; 141:366-72. [PMID: 23768369 DOI: 10.1016/j.foodchem.2013.02.089] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2012] [Revised: 01/10/2013] [Accepted: 02/21/2013] [Indexed: 12/29/2022]
Abstract
In this study, we aimed to examine the mutagenic and antimutagenic potencies of three luteolin derivatives (luteolin-7-O-glucoside, luteolin-7-O-rutinoside and luteolin-7-O-glucuronide) by using a eukaryotic cell system, Saccharomyces cerevisiae (RS112). In the antimutagenicity assays, these luteolin derivatives showed antimutagenic effects in deletion and intrachromosomal recombination events against ethyl methanesulfonate and acridine mutagen agents. In deletion events, the highest inhibition rates for luteolin-7-O-glucoside, luteolin-7-O-rutinoside and luteolin-7-O-glucuronide against ethyl methanesulfonate were 57.6%, 58.3% and 62.5%, respectively. Likewise, the highest inhibition rates for luteolin-7-O-glucoside, luteolin-7-O-rutinoside and luteolin-7-O-glucuronide against acridin were 21.8%, 22.4% and 23.6%, respectively. Our findings showed that these luteolin derivatives have stronger antimutagenic properties against ethyl methanesulfonate compared to the acridine mutagen agent.
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Affiliation(s)
- Furkan Orhan
- Agri Ibrahim Cecen University, Central Research and Application Laboratories, Agri TR-04100, Turkey
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Guo DJ, Li F, Yu PHF, Chan SW. Neuroprotective effects of luteolin against apoptosis induced by 6-hydroxydopamine on rat pheochromocytoma PC12 cells. PHARMACEUTICAL BIOLOGY 2013; 51:190-196. [PMID: 23035972 DOI: 10.3109/13880209.2012.716852] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
CONTEXT Apoptotic neuronal cell death plays an important role in Parkinson's disease (PD), a progressive neurodegenerative disorder. Luteolin, a flavonoid, has been shown to possess various pharmacological properties including strong antioxidant capacity. OBJECTIVE This study investigated the neuroprotective effect of luteolin against cytotoxicity induced by 6-hydroxy-dopamine (6-OHDA) (250 µM) in rat pheochromocytoma (PC12) cell line. MATERIALS AND METHODS The neuroprotective effect of luteolin against 6-OHDA-induced cytotoxicity in PC12 was evaluated by using cell viability test, nuclear staining and flow cytometry. In addition, the apoptotic role of luteolin was unveiled by monitoring mRNA expression of proapoptotic and anti-apoptotic genes. RESULTS Pretreatment with luteolin (3.13, 6.25, 12.5, 25 or 50 µM) could markedly attenuate 6-OHDA-induced PC12 cell viability loss in a concentration-dependent manner. Cell morphologic analysis and nuclear staining assays showed that luteolin (3.13, 12.5 or 50 µM) protected the cells from 6-OHDA-induced damage. As shown in the flow cytometry assay, the increased apoptotic rate induced by 6-OHDA could be significantly (p < 0.001) suppressed by luteolin (12.5 or 50 µM) pretreatment. The protection of luteolin (50 µM) against 6-OHDA-induced cell damage was shown to be through suppressing the over-expression of Bax gene (p < 0.01), inhibiting the reduction of Bcl-2 gene expression (p < 0.05) and markedly depressing the enhanced Bax/Bcl-2 ratio. Luteolin also downregulated the gene expression level of p53. DISCUSSION AND CONCLUSION Luteolin has protective effects against 6-OHDA-induced cell apoptosis and might be a potential nutritional supplement which could be used to prevent neurodegenerative diseases such as PD.
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Affiliation(s)
- De-Jian Guo
- State Key Laboratory of Chinese Medicine and Molecular Pharmacology, Shenzhen, PR of China
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Phytochemistry, pharmacology and medicinal properties of Carthamus tinctorius L. Chin J Integr Med 2013; 19:153-9. [PMID: 23371463 DOI: 10.1007/s11655-013-1354-5] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2012] [Indexed: 01/11/2023]
Abstract
Carthamus tinctorius L. is commonly known as Safflower. C. tinctorius extracts and oil are important in drug development with numerous pharmacological activities in the world. This plant is cultivated mainly for its seed, which is used as edible oil. For a long time C. tinctorius has been used in traditional medicines as a purgative, analgesic, antipyretic and an antidote to poisoning. It is a useful plant in painful menstrual problems, post-partum hemorrhage and osteoporosis. C. tinctorius has recently been shown to have antioxidant, analgesic, anti-inflammatory and antidiabetic activities. Carthamin, safflower yellow are the main constituents in the flower of C. tinctorius. Carthamidin, isocarthamidin, hydroxysafflor yellow A, safflor yellow A, safflamin C and luteolin are the main constituents which are reported from this plant. Caryophyllene, p-allyltoluene, 1-acetoxytetralin and heneicosane were identified as the major components for C. tinctorius flowers essential oil. Due to the easy collection of the plant and being widespread and also remarkable biological activities, this plant has become both food and medicine in many parts of the world. This review presents comprehensive analyzed information on the botanical, chemical and pharmacological aspects of C. tinctorius.
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169
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Chung IS, Kim JA, Kim JA, Choi HS, Lee JJ, Yang M, Ahn HJ, Lee SM. Reactive oxygen species by isoflurane mediates inhibition of nuclear factor κB activation in lipopolysaccharide-induced acute inflammation of the lung. Anesth Analg 2013; 116:327-35. [PMID: 23302986 DOI: 10.1213/ane.0b013e31827aec06] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND Although anesthetic-induced inhibition of lipopolysaccharide (LPS)-induced lung injury has been recognized, the underlying mechanism is obscure. Some studies suggest that reactive oxygen species (ROS) by isoflurane play a crucial role for anesthetic-induced protective effects on the brain or the heart; however, it still remains controversial. In this study, we examined the role of isoflurane-derived ROS in isoflurane-induced inhibition of lung injury and nuclear factor κB (NFκB) activation in LPS-challenged rat lungs. METHODS Male Sprague-Dawley rats were subjected to inhalation of 1.0 minimum alveolar concentration of isoflurane for 60 minutes, and intratracheal LPS 0.1 mg was administered 60 minutes later. In some cases, ROS scavenger, 2-mercaptopropinyl glycine or N-acetylcysteine was given 30 minutes before isoflurane. ROS generation was measured by fluorometer before LPS challenge and 4 hours after. Isoflurane's preconditioning effect was assessed by histologic examination, protein content, neutrophil recruitment, and determination of tumor necrosis factor (TNF)-α, interleukin (IL)-1β, and IL-6 levels in bronchoalveolar lavage fluid and lung tissue. Western blotting measured phosphorylation of inhibitory κB α (ser 32/36), NFκB p65, and inducible nitric oxide synthase (iNOS). TNF-α and IL-6 mRNA expression and immunofluorescence staining for iNOS were also assessed. RESULTS Isoflurane preconditioning reduced inflammatory lung injury and TNF-α, IL-1β, and IL-6 release in the lung. Isoflurane upregulated ROS generation before LPS but inhibited a ROS burst after LPS challenge. ROS scavenger administration before isoflurane abolished the isoflurane preconditioning effect as well as isoflurane-induced inhibition of phosphorylation of inhibitory κBα, NFκB p65, iNOS activation, and mRNA expression of TNF-α and IL-6 in acute LPS-challenged lungs. CONCLUSIONS This study suggests a crucial role of upregulated ROS generation by isoflurane for modification of inflammatory pathways by isoflurane preconditioning in acute inflammation of the lung.
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Affiliation(s)
- In Sun Chung
- Department of Anesthesiology and Pain Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
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Bellik Y, Boukraâ L, Alzahrani HA, Bakhotmah BA, Abdellah F, Hammoudi SM, Iguer-Ouada M. Molecular mechanism underlying anti-inflammatory and anti-allergic activities of phytochemicals: an update. Molecules 2012; 18:322-53. [PMID: 23271469 PMCID: PMC6269762 DOI: 10.3390/molecules18010322] [Citation(s) in RCA: 135] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2012] [Revised: 12/06/2012] [Accepted: 12/14/2012] [Indexed: 12/18/2022] Open
Abstract
The resort worldwide to edible medicinal plants for medical care has increased significantly during the last few years. Currently, there is a renewed interest in the search for new phytochemicals that could be developed as useful anti-inflammatory and anti-allergic agents to reduce the risk of many diseases. The activation of nuclear transcription factor-kappa B (NF-κB) has now been linked to a variety of inflammatory diseases, while data from numerous studies underline the importance of phytochemicals in inhibiting the pathway that activates this transcription factor. Moreover, the incidence of type I allergic disorders has been increasing worldwide, particularly, the hypersensitivity to food. Thus, a good number of plant products with anti-inflammatory and anti-allergic activity have been documented, but very few of these compounds have reached clinical use and there is scant scientific evidence that could explain their mode of action. Therefore, this paper intends to review the most salient recent reports on the anti-inflammatory and anti-allergic properties of phytochemicals and the molecular mechanisms underlying these properties.
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Affiliation(s)
- Yuva Bellik
- Laboratory of Research on Local Animal Products, Ibn-Khaldoun University of Tiaret, Tiaret 14000, Algeria; E-Mails: (Y.B.); (F.A.); (S.M.H.)
- Faculty of Nature and Life Sciences, Abderrahmane Mira University, Béjaia 06000, Algeria; E-Mail:
| | - Laïd Boukraâ
- Laboratory of Research on Local Animal Products, Ibn-Khaldoun University of Tiaret, Tiaret 14000, Algeria; E-Mails: (Y.B.); (F.A.); (S.M.H.)
- Mohammad Hussein Al Amoudi Chair for Diabetic Foot Research, King Abdulaziz University, Jeddah 21589, Saudi Arabia; E-Mails: (H.A.A.); (B.A.B.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel./Fax: +213-795-306-930
| | - Hasan A. Alzahrani
- Mohammad Hussein Al Amoudi Chair for Diabetic Foot Research, King Abdulaziz University, Jeddah 21589, Saudi Arabia; E-Mails: (H.A.A.); (B.A.B.)
- Department of Surgery, Faculty of Medicine, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Balkees A. Bakhotmah
- Mohammad Hussein Al Amoudi Chair for Diabetic Foot Research, King Abdulaziz University, Jeddah 21589, Saudi Arabia; E-Mails: (H.A.A.); (B.A.B.)
- Department of Nutrition Food Sciences, Arts and Design College, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Fatiha Abdellah
- Laboratory of Research on Local Animal Products, Ibn-Khaldoun University of Tiaret, Tiaret 14000, Algeria; E-Mails: (Y.B.); (F.A.); (S.M.H.)
| | - Si M. Hammoudi
- Laboratory of Research on Local Animal Products, Ibn-Khaldoun University of Tiaret, Tiaret 14000, Algeria; E-Mails: (Y.B.); (F.A.); (S.M.H.)
| | - Mokrane Iguer-Ouada
- Faculty of Nature and Life Sciences, Abderrahmane Mira University, Béjaia 06000, Algeria; E-Mail:
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Nunes C, Ferreira E, Freitas V, Almeida L, Barbosa RM, Laranjinha J. Intestinal anti-inflammatory activity of red wine extract: unveiling the mechanisms in colonic epithelial cells. Food Funct 2012; 4:373-83. [PMID: 23233037 DOI: 10.1039/c2fo30233k] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The development of new therapeutic approaches, combining efficacy and safety against intestinal inflammation, notably inflammatory bowel disease (IBD), has emerged as an important goal due to the significant side effects and the lack of effectiveness of standard current therapies. Recently, several studies described the health-promoting effects of red wine, including anti-inflammatory properties, but the molecular mechanisms underlying its beneficial role remain largely unknown. Red wine is rich in phenolic compounds and it has been suggested that the positive effect of red wine intake might be attributed not only to the antioxidant properties of these compounds but also to the modulation of signalling cascades in connection with physiological and pathophysiological conditions such as inflammatory processes. This study assesses the potential anti-inflammatory action of a red wine extract (RWE) enriched in polyphenols in a cellular model of intestinal inflammation using cytokines-stimulated HT-29 colon epithelial cells. RWE suppressed cytokines-induced IκB degradation and interleukin-8 production in a dose-dependent manner. Coherently, key inflammatory mediators downstream NF-κB activation; notably cyclooxygenase-2 and inducible nitric oxide synthase were maintained at low levels by RWE in the presence of the cytokines. Additionally, RWE inhibited both the increase of nitric oxide derived from iNOS and of protein tyrosine nitration, a biomarker of nitrosative stress that typically requires the reaction of nitric oxide with the superoxide radical. Taken together, the anti-inflammatory action of RWE, mechanistically supported by the modulation of cascades orchestrated by NF-κB and involving nitric oxide, suggests that RWE (a readily straightforward preparation when compared with the purification of specific compounds) may represent a simple and inexpensive therapeutic strategy in the context of intestinal inflammation.
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Affiliation(s)
- Carla Nunes
- Center for Neurosciences and Cell Biology and Faculty of Pharmacy, University of Coimbra, Health Sciences Campus, Azinhaga de Santa Comba, 3000-548 Coimbra, Portugal
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Orhan F, Barış Ö, Yanmış D, Bal T, Güvenalp Z, Güllüce M. Isolation of some luteolin derivatives from Mentha longifolia (L.) Hudson subsp. longifolia and determination of their genotoxic potencies. Food Chem 2012; 135:764-9. [DOI: 10.1016/j.foodchem.2012.04.137] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 04/24/2012] [Accepted: 04/25/2012] [Indexed: 01/19/2023]
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Prostaglandin E2 and the suppression of phagocyte innate immune responses in different organs. Mediators Inflamm 2012; 2012:327568. [PMID: 23024463 PMCID: PMC3449139 DOI: 10.1155/2012/327568] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2012] [Revised: 04/19/2012] [Accepted: 05/03/2012] [Indexed: 12/15/2022] Open
Abstract
The local and systemic production of prostaglandin E2 (PGE2) and its actions in phagocytes lead to immunosuppressive conditions. PGE2 is produced at high levels during inflammation, and its suppressive effects are caused by the ligation of the E prostanoid receptors EP2 and EP4, which results in the production of cyclic AMP. However, PGE2 also exhibits immunostimulatory properties due to binding to EP3, which results in decreased cAMP levels. The various guanine nucleotide-binding proteins (G proteins) that are coupled to the different EP receptors account for the pleiotropic roles of PGE2 in different disease states. Here, we discuss the production of PGE2 and the actions of this prostanoid in phagocytes from different tissues, the relative contribution of PGE2 to the modulation of innate immune responses, and the novel therapeutic opportunities that can be used to control inflammatory responses.
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174
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Yoon YC, Hwang JT, Sung MJ, Wang S, Munkhtugs D, Rhyu MR, Park JH. Inhibitory effect of luteolin on the odorant-induced cAMP level in HEK293 cells expressing the olfactory receptor. Biofactors 2012; 38:360-4. [PMID: 22593001 DOI: 10.1002/biof.1025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Accepted: 04/12/2012] [Indexed: 11/06/2022]
Abstract
Luteolin is a flavonoid in many fruits and vegetables. Although luteolin has important biological functions, including antioxidant, anti-inflammatory, antimicrobial, and neuroprotective activities, little is known about the functions of luteolin in the olfactory system. Various odorants can be detected and distinguished by using several molecular processes, including the binding of odorants to odorant receptors, activation of adenylyl cyclase (AC), changes of cyclic adenosine monophosphate (cAMP) and Ca(2+) levels in olfactory sensory neurons, as well as changes in membrane potentials and the transmission of electric signals to the brain. Because AC-cAMP signal transduction plays a pivotal role in the olfactory system, we evaluated the effects of luteolin on the AC-cAMP pathway that had been stimulated by the odorant eugenol. We demonstrated that eugenol caused an upregulation of the cAMP level and the phosphorylation of phosphokinase A (PKA, a downstream target of cAMP) in human embryonic kidney 293 (HEK293) cells expressing the murine eugenol receptor. This upregulation significantly decreased in the presence of luteolin, suggesting that luteolin inhibited the odorant-induced production of cAMP and affected the downstream phosphorylation of PKA.
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Affiliation(s)
- Yeo Cho Yoon
- Division of Metabolism and Functionality Research, Korea Food Research Institute, Baekhyun-Dong, Bundang-Gu, Sungnam, Kyungki-Do, Republic of Korea
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Shin DK, Kim MH, Lee SH, Kim TH, Kim SY. Inhibitory effects of luteolin on titanium particle-induced osteolysis in a mouse model. Acta Biomater 2012; 8:3524-31. [PMID: 22583904 DOI: 10.1016/j.actbio.2012.05.002] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2012] [Revised: 04/27/2012] [Accepted: 05/04/2012] [Indexed: 01/11/2023]
Abstract
Wear particles liberated from the surfaces of an implanted prosthesis are associated with peri-implant osteolysis and subsequent aseptic loosening. In the latter wear particle-induced inflammation and osteoclastogenesis have been identified as critical factors, and their inhibition as important steps in the treatment of affected patients, such as those undergoing total hip replacement. In this study the ability of luteolin to inhibit both titanium (Ti) particle-induced osteoclastogenesis in vitro and osteolysis in a murine calvaria Ti particle-induced model of osteolysis was examined. The results showed that luteolin, a highly potent and efficient inhibitor of tumor necrosis factor α (TNF-α) and interleukin-6 expression, inhibited Ti particle-induced inflammatory cytokine release, osteoclastogenesis, and bone resorption in bone marrow macrophages. Microcomputed tomography and histological analyses showed that the Ti particles caused significant bone resorption and increased TRAP(+) multinuclear osteoclasts in the murine calvarial model of osteolysis, whereas this was not the case in the luteolin treatment group, in which osteolytic suppression was accompanied by a decrease in both TNF-α production and serum levels of the osteoclast marker the C-terminal telopeptide fragment of type I collagen. These results support the use of luteolin as a natural compound in the prevention and treatment of aseptic loosening after total replacement arthroplasty.
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Matsui M, Adib-Conquy M, Coste A, Kumar-Roiné S, Pipy B, Laurent D, Pauillac S. Aqueous extract of Vitex trifolia L. (Labiatae) inhibits LPS-dependent regulation of inflammatory mediators in RAW 264.7 macrophages through inhibition of Nuclear Factor kappa B translocation and expression. JOURNAL OF ETHNOPHARMACOLOGY 2012; 143:24-32. [PMID: 22732725 DOI: 10.1016/j.jep.2012.05.043] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2012] [Revised: 05/09/2012] [Accepted: 05/25/2012] [Indexed: 06/01/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Vitex trifolia L. (Labiatae), a widespread tree found from the Asia-Pacific to the east Africa regions is used in the traditional medicine of the Pacific islands to treat inflammatory-associated conditions. AIM OF THE STUDY We herein evaluated its in vitro regulatory effects on the expression profile of lipopolysaccharide (LPS)-induced inflammatory genes focusing on regulation of chemokines C-X-C motif 10 (CXCL-10) and C-C motif ligand 3 (CCL-3) and cyclo-oxygenase (COX)-2. Furthermore, the plant effect on the LPS-mediated activation of Nuclear Factor kappa B (NF-κB) was also studied. MATERIALS AND METHODS Aqueous extract of Vitex trifolia leaves was prepared and evaluated for its effect on LPS-induced stress and toxicity-related genes in RAW 264.7 macrophage cells using RT(2) Profiler Polymerase Chain Reaction (PCR) Array System. Effects of the extract on LPS-induced chemokines CCL-3 and CXCL-10, COX-2, and NF-κB p50 and p65 mRNA levels were also studied using Reverse Transcription quantitative PCR (RT-qPCR) technique. Translocation of the nuclear factor was further assessed by measuring its nuclear p65 subunit via an ELISA-based TransAM method. RESULTS Vitex trifolia extract at 5000μg/ml exerted a significant inhibitory effect on the expression of various LPS-induced inflammatory genes in RAW 264.7 cells after 8h of incubation time. Using RT-qPCR, this anti-inflammatory effect was further confirmed by significant inhibition of CCL-3 and CXCL-10 mRNA production in LPS-stimulated RAW 264.7 cells upon treatment with 2500μg/ml of Vitex trifolia extract. Furthermore, the inhibitory activity of this plant on LPS-induced COX-2 mRNA was also observed at a concentration of 2500μg/ml in a time-dependent manner. TransAM assays showed that LPS-induced NF-κB translocation was also inhibited by Vitex trifolia extract even at a concentration of extract as low as 250μg/ml. RT-qPCR assays showed that aqueous extract of Vitex trifolia leaves had a significant inhibitory activity on LPS-induced p50 mRNA synthesis. Interestingly, however, no effect on p65 subunit mRNA expression was observed. Moreover, PCR array analysis showed that LPS-induced inflammatory and apoptosis genes under NF-κB control are also repressed by the extract. CONCLUSION The anti-inflammatory properties of Vitex trifolia extract seem associated with inhibition of NF-κB translocation through a reduction in the expression level of NF-κB p50 but interestingly not p65 subunit mRNA. The regulatory effects of Vitex trifolia on NF-κB and consequently on inflammation mediators such as chemokines CCL-3 and CXCL-10, and COX-2 provide new evidence of its efficacy and emphasise its high potential therapeutic value. However, further in vivo experiments are still required to validate its utilization as a remedy against inflammatory diseases.
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Affiliation(s)
- Mariko Matsui
- Institut Pasteur de Nouvelle-Calédonie, BP61, 98845 Noumea, New Caledonia
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Wang Y, Zhu Y, Gao L, Yin H, Xie Z, Wang D, Zhu Z, Han X. Formononetin attenuates IL-1β-induced apoptosis and NF-κB activation in INS-1 cells. Molecules 2012; 17:10052-64. [PMID: 22922276 PMCID: PMC6268495 DOI: 10.3390/molecules170910052] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Revised: 07/18/2012] [Accepted: 08/03/2012] [Indexed: 12/15/2022] Open
Abstract
Several studies suggest that the inflammation plays a role in the pathogenesis of some glucose disorders in adults. Exposure of pancreatic β-cells to cytokines, such as interleukin-1β (IL-1β), is thought to contribute to β-cell apoptosis. One important event triggered by IL-1β is induction of nitric oxide synthase (iNOS), an enzyme that catalyzes intracellular generation of the cytotoxic free radical NO. Recent work have suggested that formononetin, as an O-methylated isoflavone found in a number of plants and herbs like Astragalus membranaceus, inhibited some pro-inflammatory cytokine production in macrophages. However, the roles of formononetin in pancreatic beta cells have not been fully established. The aim of the present study was to assess possible in vitro effects of formononetin on cell apoptosis induced by IL-1β in the rat insulinoma cell line, INS-1. Our results demonstrate that formononetin significantly prevents IL-1β-increased INS-1 cell death and blocks cytokine-induced apoptotic signaling (the reduction of Bax/Bcl-2 ratio and caspase-3 activity). Formononetin also inhibited the activation of nuclear factor-kappaB (NF-κB), which is a significant transcription factor for iNOS, so as to decease nitric oxide (NO) formation in a dose dependent manner in vitro. Our observations indicated that formononetin could protect against pancreatic β-cell apoptosis caused by IL-1β and therefore could be used in the future as a new drug improving diabetes mellitus.
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Affiliation(s)
- Yao Wang
- Key Laboratory of Human Functional Genomics of Jiangsu Province, Clinical Diabetes Centre of Jiangsu Province, Nanjing Medical University, Nanjing 210029, Jiangsu, China
- Department of Endocrinology, Zhongda Hospital, Institute of Diabetes, Southeast University, No.87 Dingjiaqiao Road, Nanjing 210009, Jiangsu, China
| | - Yunxia Zhu
- Key Laboratory of Human Functional Genomics of Jiangsu Province, Clinical Diabetes Centre of Jiangsu Province, Nanjing Medical University, Nanjing 210029, Jiangsu, China
| | - Lu Gao
- Key Laboratory of Human Functional Genomics of Jiangsu Province, Clinical Diabetes Centre of Jiangsu Province, Nanjing Medical University, Nanjing 210029, Jiangsu, China
| | - Han Yin
- Department of Endocrinology, Zhongda Hospital, Institute of Diabetes, Southeast University, No.87 Dingjiaqiao Road, Nanjing 210009, Jiangsu, China
| | - Zuoling Xie
- Department of Endocrinology, Zhongda Hospital, Institute of Diabetes, Southeast University, No.87 Dingjiaqiao Road, Nanjing 210009, Jiangsu, China
| | - Dong Wang
- Department of Endocrinology, Zhongda Hospital, Institute of Diabetes, Southeast University, No.87 Dingjiaqiao Road, Nanjing 210009, Jiangsu, China
| | - Zhengqiu Zhu
- Department of Endocrinology, Zhongda Hospital, Institute of Diabetes, Southeast University, No.87 Dingjiaqiao Road, Nanjing 210009, Jiangsu, China
| | - Xiao Han
- Key Laboratory of Human Functional Genomics of Jiangsu Province, Clinical Diabetes Centre of Jiangsu Province, Nanjing Medical University, Nanjing 210029, Jiangsu, China
- Author to whom correspondence should be addressed; ; Tel.: +86-25-8686-2733; Fax: +86-25-8686-2731
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178
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Anti-inflammatory activity of Korean thistle Cirsium maackii and its major flavonoid, luteolin 5-O-glucoside. Food Chem Toxicol 2012; 50:2171-9. [DOI: 10.1016/j.fct.2012.04.011] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2012] [Revised: 03/26/2012] [Accepted: 04/06/2012] [Indexed: 12/18/2022]
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179
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Park SE, Sapkota K, Kim S, Kim H, Kim SJ. Kaempferol acts through mitogen-activated protein kinases and protein kinase B/AKT to elicit protection in a model of neuroinflammation in BV2 microglial cells. Br J Pharmacol 2012; 164:1008-25. [PMID: 21449918 DOI: 10.1111/j.1476-5381.2011.01389.x] [Citation(s) in RCA: 156] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND AND PURPOSE Kaempferol, a dietary flavonoid and phyto-oestrogen, is known to have anti-inflammatory properties. Microglial activation has been implicated in various neurodegenerative diseases. Anti-inflammatory effects of kaempferol and the underlying mechanisms were investigated by using LPS-stimulated microglial BV2 cells. EXPERIMENTAL APPROACH Cell viability was measured using MTT and neutral red assays. elisa, Western blot, immunocytochemistry and electrophoretic mobility-shift assay were used to analyse NO, PGE(2) , TNF-α and IL-1β production, inducible NOS (iNOS), COX-2 expression and the involvement of signalling pathways such as toll-like receptor-4 (TLR4), MAPK cascades, PKB (AKT) and NF-κB. Accumulation of reaction oxygen species (ROS) was measured by nitroblue tetrazolium and 2'7'-dichlorofluorescein diacetate assay. Matrix metalloproteinase activity was investigated by zymography and immunoblot assay. Phagocytotic activity was assessed by use of latex beads. KEY RESULTS Kaempferol significantly attenuated LPS-induced NO, PGE(2) , TNF-α, IL-1β and ROS production and phagocytosis in a concentration-dependent manner. Kaempferol suppressed the expression of iNOS, COX-2, MMP-3 and blocked the TLR4 activation. Moreover, kaempferol inhibited LPS-induced NF-κB activation and p38 MAPK, JNK and AKT phosphorylation. CONCLUSION AND IMPLICATIONS Kaempferol was able to reduce LPS-induced inflammatory mediators through the down-regulation of TLR4, NF-κB, p38 MAPK, JNK and AKT suggesting that kaempferol has therapeutic potential for the treatment of neuroinflammatory diseases.
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Affiliation(s)
- S E Park
- Department of Biotechnology, Chosun University, Gwangju, Korea
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180
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Mekhora C, Muangnoi C, Chingsuwanrote P, Dawilai S, Svasti S, Chasri K, Tuntipopipat S. Eryngium foetidum Suppresses Inflammatory Mediators Produced by Macrophages. Asian Pac J Cancer Prev 2012; 13:653-64. [DOI: 10.7314/apjcp.2012.13.2.653] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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181
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Oswald E, Sesarman A, Franzke CW, Wölfle U, Bruckner-Tuderman L, Jakob T, Martin SF, Sitaru C. The flavonoid luteolin inhibits Fcγ-dependent respiratory burst in granulocytes, but not skin blistering in a new model of pemphigoid in adult mice. PLoS One 2012; 7:e31066. [PMID: 22328927 PMCID: PMC3273480 DOI: 10.1371/journal.pone.0031066] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2011] [Accepted: 01/01/2012] [Indexed: 11/29/2022] Open
Abstract
Bullous pemphigoid is an autoimmune blistering skin disease associated with autoantibodies against the dermal-epidermal junction. Passive transfer of antibodies against BP180/collagen (C) XVII, a major hemidesmosomal pemphigoid antigen, into neonatal mice results in dermal-epidermal separation upon applying gentle pressure to their skin, but not in spontaneous skin blistering. In addition, this neonatal mouse model precludes treatment and observation of diseased animals beyond 2-3 days. Therefore, in the present study we have developed a new disease model in mice reproducing the spontaneous blistering and the chronic course characteristic of the human condition. Adult mice were pre-immunized with rabbit IgG followed by injection of BP180/CXVII rabbit IgG. Mice pre-immunized against rabbit IgG and injected 6 times every second day with the BP180/CXVII-specific antibodies (n = 35) developed spontaneous sustained blistering of the skin, while mice pre-immunized and then treated with normal rabbit IgG (n = 5) did not. Blistering was associated with IgG and complement C3 deposits at the epidermal basement membrane and recruitment of inflammatory cells, and was partly dependent on Ly-6G-positive cells. We further used this new experimental model to investigate the therapeutic potential of luteolin, a plant flavonoid with potent anti-inflammatory and anti-oxidative properties and good safety profile, in experimental BP. Luteolin inhibited the Fcγ-dependent respiratory burst in immune complex-stimulated granulocytes and the autoantibody-induced dermal-epidermal separation in skin cryosections, but was not effective in suppressing the skin blistering in vivo. These studies establish a robust animal model that will be a useful tool for dissecting the mechanisms of blister formation and will facilitate the development of more effective therapeutic strategies for managing pemphigoid diseases.
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Affiliation(s)
- Eva Oswald
- Allergy Research Group, Department of Dermatology, University Freiburg Medical Center, Freiburg, Germany
- Molecular Dermatology, Department of Dermatology, University Freiburg Medical Center, Freiburg, Germany
- Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Alina Sesarman
- Molecular Dermatology, Department of Dermatology, University Freiburg Medical Center, Freiburg, Germany
| | - Claus-Werner Franzke
- Molecular Dermatology, Department of Dermatology, University Freiburg Medical Center, Freiburg, Germany
| | - Ute Wölfle
- Competence Centre Skintegral, Department of Dermatology, University Freiburg Medical Center, Freiburg, Germany
| | - Leena Bruckner-Tuderman
- Molecular Dermatology, Department of Dermatology, University Freiburg Medical Center, Freiburg, Germany
- BIOSS Centre for Biological Signalling Studies, Freiburg, Germany
- Freiburg Institute for Advanced Studies, Freiburg, Germany
| | - Thilo Jakob
- Allergy Research Group, Department of Dermatology, University Freiburg Medical Center, Freiburg, Germany
| | - Stefan F. Martin
- Allergy Research Group, Department of Dermatology, University Freiburg Medical Center, Freiburg, Germany
| | - Cassian Sitaru
- Molecular Dermatology, Department of Dermatology, University Freiburg Medical Center, Freiburg, Germany
- BIOSS Centre for Biological Signalling Studies, Freiburg, Germany
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182
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Flavonoids as Anti-Inflammatory and Analgesic Drugs: Mechanisms of Action and Perspectives in the Development of Pharmaceutical Forms. BIOACTIVE NATURAL PRODUCTS 2012. [DOI: 10.1016/b978-0-444-53836-9.00026-8] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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183
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Capiralla H, Vingtdeux V, Zhao H, Sankowski R, Al-Abed Y, Davies P, Marambaud P. Resveratrol mitigates lipopolysaccharide- and Aβ-mediated microglial inflammation by inhibiting the TLR4/NF-κB/STAT signaling cascade. J Neurochem 2011; 120:461-72. [PMID: 22118570 DOI: 10.1111/j.1471-4159.2011.07594.x] [Citation(s) in RCA: 303] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Activation of microglia, the resident macrophages of the brain, around the amyloid plaques is a key hallmark of Alzheimer's disease (AD). Recent evidence in mouse models indicates that microglia are required for the neurodegenerative process of AD. Amyloid-β (Aβ) peptides, the core components of the amyloid plaques, can trigger microglial activation by interacting with several Toll-like receptors (TLRs), including TLR4. In this study, we show that resveratrol, a natural polyphenol associated with anti-inflammatory effects and currently in clinical trials for AD, prevented the activation of murine RAW 264.7 macrophages and microglial BV-2 cells treated with the TLR4 ligand, lipopolysaccharide (LPS). Resveratrol preferentially inhibited nuclear factor κ-light-chain-enhancer of activated B cells (NF-κB) activation upon LPS stimulation by interfering with IKK and IκB phosphorylation, an effect that potently reduced the transcriptional stimulation of several NF-κB target genes, including tumor necrosis factor-α and interleukin-6. Consequently, downstream phosphorylation of signal transducer and activator of transcription (STAT)1 and STAT3 upon LPS stimulation was also inhibited by resveratrol. We found that resveratrol acted upstream in the activation cascade by interfering with TLR4 oligomerization upon receptor stimulation. Resveratrol treatment also prevented the pro-inflammatory effect of fibrillar Aβ on macrophages by potently inhibiting the effect of Aβ on IκB phosphorylation, activation of STAT1 and STAT3, and on tumor necrosis factor-α and interleukin-6 secretion. Importantly, orally administered resveratrol in a mouse model of cerebral amyloid deposition lowered microglial activation associated with cortical amyloid plaque formation. Together this work provides strong evidence that resveratrol has in vitro and in vivo anti-inflammatory effects against Aβ-triggered microglial activation. Further studies in cell culture systems showed that resveratrol acted via a mechanism involving the TLR4/NF-κB/STAT signaling cascade.
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Affiliation(s)
- Hemachander Capiralla
- The Litwin-Zucker Research Center for the Study of Alzheimer's Disease, The Feinstein Institute for Medical Research, Manhasset, New York, USA
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184
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Mehla R, Bivalkar-Mehla S, Chauhan A. A flavonoid, luteolin, cripples HIV-1 by abrogation of tat function. PLoS One 2011; 6:e27915. [PMID: 22140483 PMCID: PMC3227592 DOI: 10.1371/journal.pone.0027915] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Accepted: 10/27/2011] [Indexed: 12/17/2022] Open
Abstract
Despite the effectiveness of combination antiretroviral treatment (cART) against HIV-1, evidence indicates that residual infection persists in different cell types. Intensification of cART does not decrease the residual viral load or immune activation. cART restricts the synthesis of infectious virus but does not curtail HIV-1 transcription and translation from either the integrated or unintegrated viral genomes in infected cells. All treated patients with full viral suppression actually have low-level viremia. More than 60% of treated individuals also develop minor HIV-1 -associated neurocognitive deficits (HAND) due to residual virus and immune activation. Thus, new therapeutic agents are needed to curtail HIV-1 transcription and residual virus. In this study, luteolin, a dietary supplement, profoundly reduced HIV-1 infection in reporter cells and primary lymphocytes. HIV-1inhibition by luteolin was independent of viral entry, as shown by the fact that wild-type and VSV-pseudotyped HIV-1 infections were similarly inhibited. Luteolin was unable to inhibit viral reverse transcription. Luteolin had antiviral activity in a latent HIV-1 reactivation model and effectively ablated both clade-B- and -C -Tat-driven LTR transactivation in reporter assays but had no effect on Tat expression and its sub-cellular localization. We conclude that luteolin confers anti-HIV-1 activity at the Tat functional level. Given its biosafety profile and ability to cross the blood-brain barrier, luteolin may serve as a base flavonoid to develop potent anti-HIV-1 derivatives to complement cART.
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Affiliation(s)
- Rajeev Mehla
- Department of Pathology, Microbiology and Immunology, University of South Carolina School of Medicine, Columbia, South Carolina, United States of America
| | - Shalmali Bivalkar-Mehla
- Department of Pathology, Microbiology and Immunology, University of South Carolina School of Medicine, Columbia, South Carolina, United States of America
| | - Ashok Chauhan
- Department of Pathology, Microbiology and Immunology, University of South Carolina School of Medicine, Columbia, South Carolina, United States of America
- Department of Pharmacology, Physiology and Neuroscience, University of South Carolina School of Medicine, Columbia, South Carolina, United States of America
- * E-mail:
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185
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Luteolin Suppresses Inflammatory Mediator Expression by Blocking the Akt/NFκB Pathway in Acute Lung Injury Induced by Lipopolysaccharide in Mice. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2011; 2012:383608. [PMID: 22203870 PMCID: PMC3235668 DOI: 10.1155/2012/383608] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Revised: 09/09/2011] [Accepted: 09/09/2011] [Indexed: 11/25/2022]
Abstract
Acute lung injury (ALI), instilled by lipopolysaccharide (LPS), is a severe illness with excessive mortality and has no specific treatment strategy. Luteolin is an anti-inflammatory flavonoid and widely distributed in the plants. Pretreatment with luteolin inhibited LPS-induced histological changes of ALI and lung tissue edema. In addition, LPS-induced inflammatory responses, including increased vascular permeability, tumor necrosis factor (TNF)-α and interleukin (IL)-6 production, and expression of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2), were also reduced by luteolin in a concentration-dependent manner. Furthermore, luteolin suppressed activation of NFκB and its upstream molecular factor, Akt. These results suggest that the protection mechanism of luteolin is by inhibition of NFκB activation possibly via Akt.
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186
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Jiang Z, Hama Y, Yamaguchi K, Oda T. Inhibitory effect of sulphated polysaccharide porphyran on nitric oxide production in lipopolysaccharide-stimulated RAW264.7 macrophages. J Biochem 2011; 151:65-74. [DOI: 10.1093/jb/mvr115] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
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187
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Kuo MY, Liao MF, Chen FL, Li YC, Yang ML, Lin RH, Kuan YH. Luteolin attenuates the pulmonary inflammatory response involves abilities of antioxidation and inhibition of MAPK and NFκB pathways in mice with endotoxin-induced acute lung injury. Food Chem Toxicol 2011; 49:2660-6. [DOI: 10.1016/j.fct.2011.07.012] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2011] [Revised: 07/06/2011] [Accepted: 07/08/2011] [Indexed: 11/16/2022]
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188
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Tu T, Giblin D, Gross ML. Structural determinant of chemical reactivity and potential health effects of quinones from natural products. Chem Res Toxicol 2011; 24:1527-39. [PMID: 21721570 DOI: 10.1021/tx200140s] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Although many phenols and catechols found as polyphenol natural products are antioxidants and have putative disease-preventive properties, others have deleterious health effects. One possible route to toxicity is the bioactivation of the phenolic function to quinones that are electrophilic, redox-agents capable of modifying DNA and proteins. The structure-property relationships of biologically important quinones and their precursors may help understand the balance between their health benefits and risks. We describe a mass-spectrometry-based study of four quinones produced by oxidizing flavanones and flavones. Those with a C2-C3 double bond on ring C of the flavonoid stabilize by delocalization of an incipient positive charge from protonation and render the protonated quinone particularly susceptible to nucleophilic attack. We hypothesize that the absence of this double bond is one specific structural determinant that is responsible for the ability of quinones to modify biological macromolecules. Those quinones containing a C2-C3 single bond have relatively higher aqueous stability and longer half-lives than those with a double bond at the same position; the latter have short half-lives at or below ∼1 s. Quinones with a C2-C3 double bond show little ability to depurinate DNA because they are rapidly hydrated to unreactive species. Molecular-orbital calculations support that quinone hydration by a highly structure-dependent mechanism accounts for their chemical properties. The evidence taken together support a hypothesis that those flavonoids and related natural products that undergo oxidation to quinones and are then rapidly hydrated are unlikely to damage important biological macromolecules.
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Affiliation(s)
- Tingting Tu
- Center for Biomedical and Bioorganic Mass Spectrometry, Department of Chemistry, Washington University in St. Louis, St. Louis, Missouri 63130, USA
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189
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González R, Ballester I, López-Posadas R, Suárez MD, Zarzuelo A, Martínez-Augustin O, Sánchez de Medina F. Effects of flavonoids and other polyphenols on inflammation. Crit Rev Food Sci Nutr 2011; 51:331-62. [PMID: 21432698 DOI: 10.1080/10408390903584094] [Citation(s) in RCA: 345] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Flavonoids are a family of polyphenolic compounds which are widespread in nature (vegetables) and are consumed as part of the human diet in significant amounts. There are other types of polyphenols, including, for example, tannins and resveratrol. Flavonoids and related polyphenolic compounds have significant antiinflammatory activity, among others. This short review summarizes the current knowledge on the effects of flavonoids and related polyphenolic compounds on inflammation, with a focus on structural requirements, the mechanisms involved, and pharmacokinetic considerations. Different molecular (cyclooxygenase, lipoxygenase) and cellular targets (macrophages, lymphocytes, epithelial cells, endothelium) have been identified. In addition, many flavonoids display significant antioxidant/radical scavenging properties. There is substantial structural variation in these compounds, which is bound to have an impact on their biological profile, and specifically on their effects on inflammatory conditions. However, in general terms there is substantial consistency in the effects of these compounds despite considerable structural variations. The mechanisms have been studied mainly in myeloid cells, where the predominant effect is an inhibition of NF-κB signaling and the downregulation of the expression of proinflammatory markers. At present there is a gap in knowledge of in vitro and in vivo effects, although the pharmacokinetics of flavonoids has advanced considerably in the last decade. Many flavonoids have been studied for their intestinal antiinflammatory activity which is only logical, since the gastrointestinal tract is naturally exposed to them. However, their potential therapeutic application in inflammation is not restricted to this organ and extends to other sites and conditions, including arthritis, asthma, encephalomyelitis, and atherosclerosis, among others.
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Affiliation(s)
- R González
- Department of Pharmacology, CIBERehd, School of Pharmacy, University of Granada, Granada, Spain
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190
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Kao TK, Ou YC, Lin SY, Pan HC, Song PJ, Raung SL, Lai CY, Liao SL, Lu HC, Chen CJ. Luteolin inhibits cytokine expression in endotoxin/cytokine-stimulated microglia. J Nutr Biochem 2011; 22:612-24. [DOI: 10.1016/j.jnutbio.2010.01.011] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2009] [Revised: 01/14/2010] [Accepted: 01/25/2010] [Indexed: 12/30/2022]
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191
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Zhu LH, Bi W, Qi RB, Wang HD, Lu DX. Luteolin inhibits microglial inflammation and improves neuron survival against inflammation. Int J Neurosci 2011; 121:329-36. [PMID: 21631167 DOI: 10.3109/00207454.2011.569040] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Microglia activation is one of the causative factors for neuroinflammation, which results in brain damage during neurodegenerative disease. Accumulating evidence has shown that the flavonoid luteolin (Lut) possesses potent anti-inflammatory properties; however, its effect on microglia inhibition is currently unknown. Moreover, it is not clear whether Lut also has indirect neuroprotective effects by reducing inflammatory mediators and suppressing microglia activation. In this study, we examined the effects of Lut on lipopolysaccharide (LPS)-induced proinflammatory mediator production and signaling pathways in murine BV2 microglia. In addition, we cocultured microglia and neurons to observe the indirect neuroprotective effects of Lut. Lut inhibited the LPS-stimulated expression of inducible NO synthase (iNOS), cyclooxygenase-2 (COX-2), tumor necrosis factor alpha (TNF-α), and interleukin-1β (IL-1β) as well as the production of nitric oxide (NO) and prostaglandin E(2) (PGE(2)). Moreover, Lut blocked LPS-induced nuclear factor kappa B (NF-κB) activation. Preincubation of microglia with Lut diminished the neurotoxic effects, owing to the direct anti-inflammatory effects of the compound. Taken together, our findings suggest that Lut may have a potential therapeutic application in the treatment of neuroinflammatory disorders.
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Affiliation(s)
- Li-Hong Zhu
- Department of Pathophysiology, Institute of Brain Research, Key Laboratory of State Administration of Traditional Chinese Medicine of the People's Republic of China, School of Medicine, JiNan University, Guangzhou 510632, Guangdong, China
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192
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Inhibition of macrophage activation and suppression of graft rejection by DTCM-glutarimide, a novel piperidine derived from the antibiotic 9-methylstreptimidone. Inflamm Res 2011; 60:879-88. [PMID: 21625968 DOI: 10.1007/s00011-011-0348-z] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2010] [Revised: 04/15/2011] [Accepted: 05/13/2011] [Indexed: 10/18/2022] Open
Abstract
OBJECTIVE We have previously synthesized a novel piperidine compound, 3-[(dodecylthiocarbonyl)methyl]glutarimide (DTCM-glutarimide), that inhibits LPS-induced NO production, and in the present research we studied further the anti-inflammatory activity of DTCM-glutarimide in a macrophage cell line and in mice bearing transplanted hearts. MATERIALS AND METHODS Mouse macrophage-like RAW264.7 cells were employed for the evaluation of cellular inflammatory activity. DTCM-glutarimide was synthesized in our laboratory. The AP-1 activity was measured by nuclear translocation and phosphorylation. For the heart transplantation experiment, male C57BL/6 (H-2b) and BALB/c (H-2d) mice were used as donor and recipient, respectively. DTCM-glutarimide was administered intraperitoneally. RESULTS DTCM-glutarimide inhibited the LPS-induced expression of iNOS and COX-2 in macrophages; but, unexpectedly, it did not inhibit LPS-induced NF-κB activation. Instead, it inhibited the nuclear translocation of both c-Jun and c-Fos. It also inhibited LPS-induced c-Jun phosphorylation. Moreover, it inhibited the mixed lymphocyte reaction in primary cultures of mouse spleen cells; and furthermore, in mice it prolonged the graft survival in heart transplantation experiments. CONCLUSION The novel piperidine compound, DTCM-glutarimide, was found to be a new inhibitor of macrophage activation, inhibiting AP-1 activity. It also inhibited graft rejection in mice, and thus may be a candidate for an anti-inflammatory agent.
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193
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Wadibhasme PG, Ghaisas MM, Thakurdesai PA. Anti-asthmatic potential of chrysin on ovalbumin-induced bronchoalveolar hyperresponsiveness in rats. PHARMACEUTICAL BIOLOGY 2011; 49:508-515. [PMID: 21501099 DOI: 10.3109/13880209.2010.521754] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
CONTEXT Chrysin, a flavonoid obtained from various natural sources, has been reported to act as an anti-inflammatory and antioxidant agent. However, its anti-allergic action is not fully understood. OBJECTIVE In this study, we investigated the in vivo anti-asthmatic activity of chrysin. MATERIALS AND METHODS The effects of chrysin were evaluated using ovalbumin (OVA) (two subcutaneous 1 mL injections of 20 μg) to induce bronchoalveolar hyperresponsiveness in rats. Chrysin, when administered at 3, 10, and 30 mg/kg, p.o., respectively, before OVA challenge, reduced inflammatory cell (total and differential cell count) infiltration into the lungs measured from bronchoalveolar lavage fluid as supported by lung histology. RESULTS The total lung injury score was reduced in a dose-dependent manner, evaluated in six different categories (infiltration of leucocytes, type of inflammatory exudates, status of bronchi, perivascular status of lung blood vessels, integrity of alveoli and activation of alveolar macrophages). Various cellular injury parameters such as alkaline phosphatase, lactate dehydrogenase, and total protein were estimated and found to be reduced by chrysin pretreatment. Further, chrysin was found to reduce nitrite concentration (NO) and lipid peroxidation, suggesting its antioxidant activity. DISCUSSION AND CONCLUSION Chrysin showed anti-asthmatic potential, probably due to the alteration of Th1/Th2 polarization via the suppression of inducible nitric oxide synthase, nuclear factor-κB, and activation protein.
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Affiliation(s)
- Pankaj G Wadibhasme
- Department of Pharmacology, Padmashree Dr D Y Patil Institute of Pharmaceutical Sciences and Research, Pimpri, Pune, India
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Protective Effects of Luteolin on Diabetic Nephropathy in STZ-Induced Diabetic Rats. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2011; 2011:323171. [PMID: 21584231 PMCID: PMC3092543 DOI: 10.1155/2011/323171] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2010] [Accepted: 03/02/2011] [Indexed: 12/15/2022]
Abstract
Diabetic nephropathy is a long-term complication of diabetic mellitus. Many experimental evidences suggest that persistent hyperglycaemia generates intracellular reactive oxygen species (ROS) and upregulates transforming growth factor-b1 and extracellular matrix expression in mesangial and tubular epithelial cells, which is involved of free radicals in the pathogenesis of diabetes and more importantly in the development of diabetic complications. Antioxidants effectively inhibit high-glucose- and H2O2-induced transforming growth factor-b1 and fibronectin upregulation, thus providing evidence that ROS play an important role in high glucose-induced renal injury. The flavonoid luteolin has been shown to possess direct antioxidant activity, therefore we hypothesize that it may be useful in treatment of many chronic disease associated with oxidative stress, such as diabetic nephropathy via its antioxidant properties. Our results suggested that protection against development of diabetic nephropathy by luteolin treatment involved changes in superoxide dismutase (SOD) activity, the malondialdehyde (MDA) content and expression of Heme Oxygenase-1 (HO-1) protein.
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195
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Lee H, Lee D, Kim Y, Lee G, Kim SJ, Jung S, Jung H, Bae H. Lipopolysaccharide induced lung inflammation is inhibited by Lonicera japonica. Mol Cell Toxicol 2011. [DOI: 10.1007/s13273-011-0012-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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196
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Park CM, Jin KS, Lee YW, Song YS. Luteolin and chicoric acid synergistically inhibited inflammatory responses via inactivation of PI3K-Akt pathway and impairment of NF-κB translocation in LPS stimulated RAW 264.7 cells. Eur J Pharmacol 2011; 660:454-9. [PMID: 21513709 DOI: 10.1016/j.ejphar.2011.04.007] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2011] [Revised: 03/17/2011] [Accepted: 04/06/2011] [Indexed: 11/25/2022]
Abstract
Synergistic anti-inflammatory effects of luteolin and chicoric acid, two abundant constituents of the common dandelion (Taraxacum officinale Weber), were investigated in lipopolysaccharide (LPS) stimulated RAW 264.7 cells. Co-treatment with luteolin and chicoric acid synergistically reduced cellular concentrations of nitric oxide (NO) and prostaglandin E2 (PGE2) and also inhibited expression of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2). In addition, co-treatment reduced the levels of proinflammatory cytokines, tumor necrosis factor (TNF)-α, and interleukin (IL)-1β. Both luteolin and chicoric acid suppressed oxidative stress, but they did not exhibit any synergistic activity. Luteolin and chicoric acid co-treatment inhibited phosphorylation of NF-κB and Akt, but had no effect on extracellular signal-regulated kinase (ERK), c-Jun NH2-terminal kinase (JNK), and p38. This anti-inflammatory signaling cascade coincides with that affected by luteolin treatment alone. These results suggest that luteolin plays a central role in ameliorating LPS-induced inflammatory cascades via inactivation of the NF-κB and Akt pathways, and that chicoric acid strengthens the anti-inflammatory activity of luteolin through NF-κB attenuation.
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Affiliation(s)
- Chung Mu Park
- Department of Smart Foods and Drugs, Inje University, Gimhae, Republic of Korea
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197
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Yeh J, Hsu J, Hong Y, Wu J, Liang J, Wu B, Chen I, Liou S. Eugenolol and Glyceryl-Isoeugenol Suppress LPS-Induced INOS Expression by Down-Regulating NF-κB and AP-1 through Inhibition of Mapks and AKT/IκBα Signaling Pathways in Macrophages. Int J Immunopathol Pharmacol 2011; 24:345-56. [DOI: 10.1177/039463201102400208] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Eugenol and isoeugenol, two components of clover oil, have been reported to possess several biomedical properties, such as anti-inflammatory, antimicrobial and antioxidant effects. This study aims to examine the anti-inflammatory effects of eugenol, isoeugenol and four of their derivatives on expression of inducible nitric oxide synthase (iNOS) activated by lipopolysaccharide (LPS) in mouse macrophages (RAW 264.7), and to investigate molecular mechanisms underlying these effects. We found that two derivatives, eugenolol and glyceryl-isoeugenol, had potent inhibitory effects on LPS-induced upregulation of nitrite levels, iNOS protein and iNOS mRNA. In addition, they both suppressed the release of tumor necrosis factor-α (TNF-α) and interleukin-1β (IL-1β) induced by LPS. Moreover, they both attenuated the DNA binding of NF-κB and AP-1, phosphorylation of inhibitory κBα (IκBα), and nuclear translocation of p65 protein induced by LPS. Finally, we demonstrated that glyceryl-isoeugenol suppressed the phosphorylation of ERK1/2, JNK and p38 MAPK, whereas eugenolol suppressed the phosphorylation of ERK1/2 and p38 MAPK. Taken together, these results suggest that that eugenolol and glyceryl-isoeugenol suppress LPS-induced iNOS expression by down-regulating NF-κB and AP-1 through inhibition of MAPKs and Akt/IκBα signaling pathways. Thus, this study implies that eugenolol and glyceryl-isoeugenol may provide therapeutic benefits for inflammatory diseases.
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Affiliation(s)
- J.L. Yeh
- Department and Graduate Institute of Pharmacology, College of Medicine, Kaohsiung Medical University, Kaohsiung
| | - J.H. Hsu
- Department of Paediatrics, Kaohsiung Medical University Hospital, Kaohsiung
- Department of Paediatrics, Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung
| | - Y.S. Hong
- Department and Graduate Institute of Pharmacology, College of Medicine, Kaohsiung Medical University, Kaohsiung
| | - J.R. Wu
- Department of Paediatrics, Kaohsiung Medical University Hospital, Kaohsiung
- Department of Paediatrics, Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung
| | - J.C. Liang
- Graduate Institute of Engineering, National Taiwan University of Science and Technology, Taipei
| | - B.N. Wu
- Department and Graduate Institute of Pharmacology, College of Medicine, Kaohsiung Medical University, Kaohsiung
| | - I.J. Chen
- Department and Graduate Institute of Pharmacology, College of Medicine, Kaohsiung Medical University, Kaohsiung
| | - S.F. Liou
- Department of Pharmacy, Chia-Nan University of Pharmacy and Science, Tainan, Taiwan
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Omar MH, Mullen W, Crozier A. Identification of proanthocyanidin dimers and trimers, flavone C-Glycosides, and antioxidants in Ficus deltoidea , a malaysian herbal tea. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2011; 59:1363-1369. [PMID: 21261251 DOI: 10.1021/jf1032729] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Phenolic compounds in an aqueous infusion of leaves of Ficus deltoidea (Moraceae), a well-known herbal tea in Malaysia, were analyzed by HPLC coupled to photodiode array and fluorescence detectors and an electrospray ionization tandem mass spectrometer. Following chromatography of extracts on a reversed phase C(12) column, 25 flavonoids were characterized and/or tentatively identified with the main constituents being flavan-3-ol monomers, proanthocyanidins, and C-linked flavone glycosides. The proanthocyanidins were dimers and trimers comprising (epi)catechin and (epi)afzelechin units. No higher molecular weight proanthocyanidin polymers were detected. The antioxidant activity of F. deltoidea extract was analyzed using HPLC with online antioxidant detection. This revealed that 85% of the total antioxidant activity of the aqueous F. deltoidea infusion was attributable to the flavan-3-ol monomers and the proanthocyanidins.
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Affiliation(s)
- Maizatul Hasyima Omar
- Plant Products and Human Nutrition Group, Graham Kerr Building, College of Medical, Veterinary and Life Sciences, University of Glasgow , Glasgow G12 8QQ, United Kingdom
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Park CM, Park JY, Noh KH, Shin JH, Song YS. Taraxacum officinale Weber extracts inhibit LPS-induced oxidative stress and nitric oxide production via the NF-κB modulation in RAW 264.7 cells. JOURNAL OF ETHNOPHARMACOLOGY 2011; 133:834-842. [PMID: 21075189 DOI: 10.1016/j.jep.2010.11.015] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2010] [Revised: 10/31/2010] [Accepted: 11/03/2010] [Indexed: 05/30/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The common dandelion (Taraxacum officinale G.H. Weber ex Wiggers, Asteraceae) has been widely used in folklore medicine to treat dyspepsia, heartburn, and spleen and liver disorders. AIM OF THE STUDY To compare the antioxidative and anti-inflammatory activities of Taraxacum officinale methanol extract (TOME) and water extract (TOWE) in lipopolysaccharide (LPS)-stimulated RAW 264.7 cells and assess their constitutional differences, including luteolin, chicoric acid, and total phenol content. MATERIALS AND METHODS Antioxidative enzyme activities, nitric oxide (NO) production, and inducible NO synthase (iNOS) and nuclear factor (NF)-κB expression were estimated by biochemical analysis, the Griess reaction, reverse transcription-polymerase chain reaction, western hybridization, and electrophoretic mobility shift assay. High-performance liquid chromatography and the Folin-Ciocalteau method were used to analyze functional phytochemicals and total phenol content. RESULTS TOME and TOWE significantly reduced NO production with an IC(50) of 79.9 and 157.5 μg/mL, respectively, without cytotoxicity. Depleted glutathione (GSH) and antioxidative enzyme activities, including superoxide dismutase, catalase, GSH-peroxidase, and GSH-reductase, were restored by dandelion extracts. Both extracts inhibited LPS-stimulated iNOS gene expression and that of its transcription factor, NF-κB, in parallel with nitrite reduction. TOME showed more potent antioxidative and anti-inflammatory capacities than TOWE, which was attributable to its high total phenol, luteolin, and chicoric acid content. CONCLUSIONS These results indicate that TOME and TOWE inhibit oxidative stress and inflammatory responses through elevated de novo synthesis of antioxidative enzymes and suppression of iNOS expression by NF-κB inactivation.
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Affiliation(s)
- Chung Mu Park
- Department of Smart Foods and Drugs, Inje University, Obang-dong 607, Gimhae, Gyeongnam 621-749, Republic of Korea
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Wang HC, Brumaghim JL. Polyphenol Compounds as Antioxidants for Disease Prevention: Reactive Oxygen Species Scavenging, Enzyme Regulation, and Metal Chelation Mechanisms in E. coliand Human Cells. ACS SYMPOSIUM SERIES 2011. [DOI: 10.1021/bk-2011-1083.ch005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Hsiao C. Wang
- Chemistry Department, Clemson University, Clemson, South Carolina 29634-0973
| | - Julia L. Brumaghim
- Chemistry Department, Clemson University, Clemson, South Carolina 29634-0973
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