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Liu ZH, Lian BF, Dong QZ, Sun H, Wei JW, Sheng YY, Li W, Li YX, Xie L, Liu L, Qin LX. Whole-exome mutational and transcriptional landscapes of combined hepatocellular cholangiocarcinoma and intrahepatic cholangiocarcinoma reveal molecular diversity. Biochim Biophys Acta Mol Basis Dis 2018; 1864:2360-2368. [DOI: 10.1016/j.bbadis.2018.01.027] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 01/25/2018] [Accepted: 01/29/2018] [Indexed: 12/20/2022]
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Nichols M, Zhang J, Polster BM, Elustondo PA, Thirumaran A, Pavlov EV, Robertson GS. Synergistic neuroprotection by epicatechin and quercetin: Activation of convergent mitochondrial signaling pathways. Neuroscience 2015; 308:75-94. [PMID: 26363153 DOI: 10.1016/j.neuroscience.2015.09.012] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Revised: 08/25/2015] [Accepted: 09/03/2015] [Indexed: 01/08/2023]
Abstract
In view of evidence that increased consumption of epicatechin (E) and quercetin (Q) may reduce the risk of stroke, we have measured the effects of combining E and Q on mitochondrial function and neuronal survival following oxygen-glucose deprivation (OGD). Relative to mouse cortical neuron cultures pretreated (24h) with either E or Q (0.1-10μM), E+Q synergistically attenuated OGD-induced neuronal cell death. E, Q and E+Q (0.3μM) increased spare respiratory capacity but only E+Q (0.3μM) preserved this crucial parameter of neuronal mitochondrial function after OGD. These improvements were accompanied by corresponding increases in cyclic AMP response element binding protein (CREB) phosphorylation and the expression of CREB-target genes that promote neuronal survival (Bcl-2) and mitochondrial biogenesis (PGC-1α). Consistent with these findings, E+Q (0.1 and 1.0μM) elevated mitochondrial gene expression (MT-ND2 and MT-ATP6) to a greater extent than E or Q after OGD. Q (0.3-3.0μM), but not E (3.0μM), elevated cytosolic calcium (Ca(2+)) spikes and the mitochondrial membrane potential. Conversely, E and E+Q (0.1 and 0.3μM), but not Q (0.1 and 0.3μM), activated protein kinase B (Akt). Nitric oxide synthase (NOS) inhibition with L-N(G)-nitroarginine methyl ester (1.0μM) blocked neuroprotection by E (0.3μM) or Q (1.0μM). Oral administration of E+Q (75mg/kg; once daily for 5days) reduced hypoxic-ischemic brain injury. These findings suggest E and Q activate Akt- and Ca(2+)-mediated signaling pathways that converge on NOS and CREB resulting in synergistic improvements in neuronal mitochondrial performance which confer profound protection against ischemic injury.
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Affiliation(s)
- M Nichols
- Department of Pharmacology, Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada; Brain Repair Centre, Faculty of Medicine, Dalhousie University, Life Sciences Research Institute, 1348 Summer Street, P.O. Box 15000, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada.
| | - J Zhang
- Department of Pharmacology, Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada; Brain Repair Centre, Faculty of Medicine, Dalhousie University, Life Sciences Research Institute, 1348 Summer Street, P.O. Box 15000, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada.
| | - B M Polster
- Department of Anesthesiology, Center for Shock Trauma and Anesthesiology Research, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
| | - P A Elustondo
- Department of Physiology and Biophysics, Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada.
| | - A Thirumaran
- Department of Pharmacology, Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada; Brain Repair Centre, Faculty of Medicine, Dalhousie University, Life Sciences Research Institute, 1348 Summer Street, P.O. Box 15000, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada.
| | - E V Pavlov
- Department of Basic Sciences, College of Dentistry, New York University, 345 East 24th Street, New York, NY 10010, USA.
| | - G S Robertson
- Department of Pharmacology, Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada; Department of Psychiatry, 5909 Veterans' Memorial Lane, 8th Floor Abbie J. Lane Memorial Building, QEII Health Sciences Centre, Halifax, Nova Scotia B3H 2E2, Canada.
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El-Nekeety AA, Abdel-Azeim SH, Hassan AM, Hassan NS, Aly SE, Abdel-Wahhab MA. Quercetin inhibits the cytotoxicity and oxidative stress in liver of rats fed aflatoxin-contaminated diet. Toxicol Rep 2014; 1:319-329. [PMID: 28962248 PMCID: PMC5598466 DOI: 10.1016/j.toxrep.2014.05.014] [Citation(s) in RCA: 91] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2014] [Revised: 05/17/2014] [Accepted: 05/24/2014] [Indexed: 11/29/2022] Open
Abstract
This study was conducted to evaluate the protective role of quercetin (Q) against the cytotoxicity, DNA damage and oxidative stress in rats fed aflatoxin (AFs)-contaminated diet. Female Sprague-Dawley rats were divided into six groups and treated for 21 days as follows: the control group; the group fed AFs-contaminated diet (1.4 mg/kg diet); the groups treated orally with Q at low or high dose (50 and 100 mg/kg b.w.) and the groups AFs-contaminated diet plus low or high dose of Q. At the end of experiment, blood and liver samples were collected for biochemical, histological, histochemical and genetic analyses. The results indicated that animal fed AFs-contaminated diet showed significant increase in serum biochemical parameters, oxidative stress markers and DNA fragmentation accompanied with significant decrease in total proteins, GPX, SOD, DNA and RNA content and fatty acid synthase (Fas) and TNFα gene expression in the liver tissue. Q at the two tested doses succeeded to normalize the biochemical parameters, improved the content of nucleic acids in hepatic tissues, the gene expression, the histopathological and histochemical picture of the liver. It could be concluded that Q has a potential antioxidant activity, a protective action and regulated the alteration of genes expression induced by AFs.
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Affiliation(s)
- Aziza A. El-Nekeety
- Food Toxicology & Contaminants Department, National Research Center, Dokki, Giza, Egypt
| | | | - Aziza M. Hassan
- Cell Biology Department, National Research Center, Dokki, Giza, Egypt
- Biotechnology Department, Faculty of Science, Taif University, Saudi Arabia
| | - Nabila S. Hassan
- Pathology Department, National Research Center, Dokki, Giza, Egypt
| | - Soher E. Aly
- Food Toxicology & Contaminants Department, National Research Center, Dokki, Giza, Egypt
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Baran I, Ionescu D, Filippi A, Mocanu MM, Iftime A, Babes R, Tofolean IT, Irimia R, Goicea A, Popescu V, Dimancea A, Neagu A, Ganea C. Novel insights into the antiproliferative effects and synergism of quercetin and menadione in human leukemia Jurkat T cells. Leuk Res 2014; 38:836-49. [PMID: 24862793 DOI: 10.1016/j.leukres.2014.04.010] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Revised: 04/13/2014] [Accepted: 04/24/2014] [Indexed: 01/28/2023]
Abstract
The flavonoid quercetin and menadione (vitamin K3) are known as potent apoptogens in human leukemia Jurkat T cells. We explored some underlying mechanisms and the potential relevance of the combination quercetin-menadione for clinical applications. In acute treatments, quercetin manifested a strong antioxidant character, but induced a transient loss of Δψm, likely mediated by opening of the mitochondrial permeability transition pore. After removal of quercetin, persistent mitochondrial hyperpolarization was generated via stimulation of respiratory Complex I. In contrast, menadione-induced Δψm dissipation was only partially and transiently reversed after menadione removal. Results indicate that Ca(2+) release is a necessary event in quercetin-induced cell death and that the survival response to quercetin is delineated within 1h from exposure. Depending on dose, the two agents exhibited either antagonistic or synergistic effects in reducing clonogenicity of Jurkat cells. 24-h combinatorial regimens at equimolar concentrations of 10-15 μM, which are compatible with a clinically achievable (and safe) scheme, reduced cell viability at efficient rates. Altogether, these findings support the idea that the combination quercetin-menadione could improve the outcome of conventional leukemia therapies, and warrant the utility of additional studies to investigate the therapeutic effects of this combination in different cellular or animal models for leukemia.
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Affiliation(s)
- Irina Baran
- "Carol Davila" University of Medicine and Pharmacy, Department of Biophysics, 8 Eroii Sanitari, 050474 Bucharest, Romania.
| | - Diana Ionescu
- "Carol Davila" University of Medicine and Pharmacy, Department of Biophysics, 8 Eroii Sanitari, 050474 Bucharest, Romania
| | - Alexandru Filippi
- "Carol Davila" University of Medicine and Pharmacy, Department of Biophysics, 8 Eroii Sanitari, 050474 Bucharest, Romania
| | - Maria Magdalena Mocanu
- "Carol Davila" University of Medicine and Pharmacy, Department of Biophysics, 8 Eroii Sanitari, 050474 Bucharest, Romania
| | - Adrian Iftime
- "Carol Davila" University of Medicine and Pharmacy, Department of Biophysics, 8 Eroii Sanitari, 050474 Bucharest, Romania
| | - Ramona Babes
- "Carol Davila" University of Medicine and Pharmacy, Department of Biophysics, 8 Eroii Sanitari, 050474 Bucharest, Romania
| | - Ioana Teodora Tofolean
- "Carol Davila" University of Medicine and Pharmacy, Department of Biophysics, 8 Eroii Sanitari, 050474 Bucharest, Romania
| | - Ruxandra Irimia
- "Carol Davila" University of Medicine and Pharmacy, Department of Biophysics, 8 Eroii Sanitari, 050474 Bucharest, Romania
| | - Alexandru Goicea
- "Carol Davila" University of Medicine and Pharmacy, Department of Biophysics, 8 Eroii Sanitari, 050474 Bucharest, Romania
| | - Valentin Popescu
- "Carol Davila" University of Medicine and Pharmacy, Department of Biophysics, 8 Eroii Sanitari, 050474 Bucharest, Romania
| | - Alexandru Dimancea
- "Carol Davila" University of Medicine and Pharmacy, Department of Biophysics, 8 Eroii Sanitari, 050474 Bucharest, Romania
| | - Andrei Neagu
- "Carol Davila" University of Medicine and Pharmacy, Department of Biophysics, 8 Eroii Sanitari, 050474 Bucharest, Romania
| | - Constanta Ganea
- "Carol Davila" University of Medicine and Pharmacy, Department of Biophysics, 8 Eroii Sanitari, 050474 Bucharest, Romania
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