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Yang HL, Lin PY, Vadivalagan C, Lin YA, Lin KY, Hseu YC. Coenzyme Q 0 defeats NLRP3-mediated inflammation, EMT/metastasis, and Warburg effects by inhibiting HIF-1α expression in human triple-negative breast cancer cells. Arch Toxicol 2023; 97:1047-1068. [PMID: 36847822 DOI: 10.1007/s00204-023-03456-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Accepted: 02/02/2023] [Indexed: 03/01/2023]
Abstract
Coenzyme Q0 (CoQ0) is a derivative quinone from Antrodia camphorata (AC) that exerts anticancer activities. This study examined the anticancer attributes of CoQ0 (0-4 µM) on inhibited anti-EMT/metastasis and NLRP3 inflammasome, and altered Warburg effects via HIF-1α inhibition in triple-negative breast cancer (MDA-MB-231 and 468) cells. MTT assay, cell migration/invasion assays, Western blotting, immunofluorescence, metabolic reprogramming, and LC-ESI-MS were carried out to assess the therapy potential of CoQ0. CoQ0 inhibited HIF-1α expression and suppressed the NLRP3 inflammasome and ASC/caspase-1 expression, followed by downregulation of IL-1β and IL-18 expression in MDA-MB-231 and 468 cells. CoQ0 ameliorated cancer stem-like markers by decreasing CD44 and increasing CD24 expression. Notably, CoQ0 modulated EMT by upregulating the epithelial marker E-cadherin and downregulating the mesenchymal marker N-cadherin. CoQ0 inhibited glucose uptake and lactate accumulation. CoQ0 also inhibited HIF-1α downstream genes involved in glycolysis, such as HK-2, LDH-A, PDK-1, and PKM-2 enzymes. CoQ0 decreased extracellular acidification rate (ECAR), glycolysis, glycolytic capacity, and glycolytic reserve in MDA-MB-231 and 468 cells under normoxic and hypoxic (CoCl2) conditions. CoQ0 inhibited the glycolytic intermediates lactate, FBP, and 2/3-PG, and PEP levels. CoQ0 increased oxygen consumption rate (OCR), basal respiration, ATP production, maximal respiration, and spare capacity under normoxic and hypoxic (CoCl2) conditions. CoQ0 increased TCA cycle metabolites, such as citrate, isocitrate, and succinate. CoQ0 inhibited aerobic glycolysis and enhanced mitochondrial oxidative phosphorylation in TNBC cells. Under hypoxic conditions, CoQ0 also mitigated HIF-1α, GLUT1, glycolytic-related (HK-2, LDH-A, and PFK-1), and metastasis-related (E-cadherin, N-cadherin, and MMP-9) protein or mRNA expression in MDA-MB-231 and/or 468 cells. Under LPS/ATP stimulation, CoQ0 inhibited NLRP3 inflammasome/procaspase-1/IL-18 activation and NFκB/iNOS expression. CoQ0 also hindered LPS/ATP-stimulated tumor migration and downregulated LPS/ATP-stimulated N-cadherin and MMP-2/-9 expression. The present study revealed that suppression of HIF-1α expression caused by CoQ0 may contribute to inhibition of NLRP3-mediated inflammation, EMT/metastasis, and Warburg effects of triple-negative breast cancers.
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Affiliation(s)
- Hsin-Ling Yang
- Institute of Nutrition, College of Health Care, China Medical University, No. 100, Section 1, Jingmao Road, Beitun, Taichung, 406040, Taiwan
| | - Ping-Yu Lin
- Institute of Nutrition, College of Health Care, China Medical University, No. 100, Section 1, Jingmao Road, Beitun, Taichung, 406040, Taiwan
| | - Chithravel Vadivalagan
- Department of Cosmeceutics, College of Pharmacy, China Medical University, No. 100, Section 1, Jingmao Road, Beitun, Taichung, 406040, Taiwan
| | - Yi-An Lin
- Institute of Nutrition, College of Health Care, China Medical University, No. 100, Section 1, Jingmao Road, Beitun, Taichung, 406040, Taiwan
| | - Kai-Yuan Lin
- Department of Medical Research, Chi-Mei Medical Center, Tainan, 710, Taiwan
- Department of Biotechnology, Chia Nan University of Pharmacy and Science, Tainan, 71710, Taiwan
| | - You-Cheng Hseu
- Department of Cosmeceutics, College of Pharmacy, China Medical University, No. 100, Section 1, Jingmao Road, Beitun, Taichung, 406040, Taiwan.
- Department of Health and Nutrition Biotechnology, Asia University, Taichung, 41354, Taiwan.
- Chinese Medicine Research Center, China Medical University, Taichung, 40402, Taiwan.
- Research Center of Chinese Herbal Medicine, China Medical University, Taichung, 40402, Taiwan.
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Yang HL, Thiyagarajan V, Shen PC, Mathew DC, Lin KY, Liao JW, Hseu YC. Anti-EMT properties of CoQ0 attributed to PI3K/AKT/NFKB/MMP-9 signaling pathway through ROS-mediated apoptosis. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2019; 38:186. [PMID: 31068208 PMCID: PMC6505074 DOI: 10.1186/s13046-019-1196-x] [Citation(s) in RCA: 87] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 04/25/2019] [Indexed: 01/08/2023]
Abstract
Background Breast cancer is the most prevalent cancer among women. In triple-negative breast cancer (TNBC) cells, a novel quinone derivative, coenzyme Q0 (CoQ0), promotes apoptosis and cell-cycle arrest. This study explored the anti-epithelial–mesenchymal transition (EMT) and antimetastatic attributes of CoQ0 in TNBC (MDA-MB-231). Methods Invasion, as well as MTT assays were conducted. Lipofectamine RNAiMAX was used to transfect cells with β-catenin siRNA. Through Western blotting and RT-PCR, the major signaling pathways’ protein expressions were examined, and the biopsied tumor tissues underwent immunohistochemical and hematoxylin and eosin staining as well as Western blotting. Results CoQ0 (0.5–2 μM) hindered tumor migration, invasion, and progression. Additionally, it caused MMP-2/− 9, uPA, uPAR, and VEGF downregulation. Furthermore, in highly metastatic MDA-MB-231 cells, TIMP-1/2 expression was subsequently upregulated and MMP-9 expression was downregulated. In addition, CoQ0 inhibited metastasis and EMT in TGF-β/TNF-α-stimulated non-tumorigenic MCF-10A cells. Bioluminescence imaging of MDA-MB-231 luciferase–injected live mice demonstrated that CoQ0 significantly inhibited metastasis of the breast cancer to the lungs and inhibited the development of tumors in MDA-MB-231 xenografted nude mice. Silencing of β-catenin with siRNA stimulated CoQ0-inhibited EMT. Western blotting as well as histological analysis established that CoQ0 reduced xenografted tumor development because apoptosis induction, cell-cycle inhibition, E-cadherin upregulation, β-catenin downregulation, and metastasis and EMT regulatory protein modulation were observed. Conclusions CoQ0 inhibited the progression of metastasis as well as EMT (in vitro and in vivo). The described approach has potential in treating human breast cancer metastasis. Electronic supplementary material The online version of this article (10.1186/s13046-019-1196-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Hsin-Ling Yang
- Institute of Nutrition, College of Biopharmaceuticals and Food Sciences, China Medical University, Taichung, 40402, Taiwan
| | - Varadharajan Thiyagarajan
- Department of Cosmeceutics, College of Biopharmaceutical and Food Sciences, China Medical University, No. 91, Hsueh-Shih Road, Taichung, 40402, Taiwan
| | - Pei-Chun Shen
- Institute of Nutrition, College of Biopharmaceuticals and Food Sciences, China Medical University, Taichung, 40402, Taiwan
| | - Dony Chacko Mathew
- Institute of Nutrition, College of Biopharmaceuticals and Food Sciences, China Medical University, Taichung, 40402, Taiwan
| | - Kai-Yuan Lin
- Department of Medical Research, Chi-Mei Medical Center, Tainan, 710, Taiwan
| | - Jiunn-Wang Liao
- Graduate Institute of Veterinary Pathology, National Chung Hsing University, Taichung, 40227, Taiwan
| | - You-Cheng Hseu
- Department of Cosmeceutics, College of Biopharmaceutical and Food Sciences, China Medical University, No. 91, Hsueh-Shih Road, Taichung, 40402, Taiwan. .,Department of Health and Nutrition Biotechnology, Asia University, Taichung, 41354, Taiwan. .,Chinese Medicine Research Center, China Medical University, Taichung, 40402, Taiwan. .,Research Center of Chinese Herbal Medicine, China Medical University, Taichung, 40402, Taiwan.
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Takahashi T, Mine Y, Okamoto T. 2,3-Dimethoxy-5-methyl-p-benzoquinone (Coenzyme Q 0) Disrupts Carbohydrate Metabolism of HeLa Cells by Adduct Formation with Intracellular Free Sulfhydryl-Groups, and Induces ATP Depletion and Necrosis. Biol Pharm Bull 2019; 41:1809-1817. [PMID: 30504682 DOI: 10.1248/bpb.b18-00497] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
2,3-Dimethoxy-5-methyl-p-benzoquinone is a common chemical structure of coenzyme Q (CoQ) that conjugates different lengths of an isoprenoid side chain at the 6-position of the p-benzoquinone ring. In a series of studies to explore the cytotoxic mechanism of CoQ homologues with a short isoprenoid side chain, we found that a CoQ analogue without an isoprenoid side chain, CoQ0, showed marked toxicity against HeLa cells in comparison with cytotoxic homologues. Therefore, we examined the cytotoxic mechanism of CoQ0. Different from the cytotoxic CoQ homologues that induced apoptosis, 100 µM CoQ0 induced necrosis of HeLa cells. The CoQ0-induced cell death was accompanied by a decrease in endogenous non-protein and protein-associated sulfhydryl (SH)-groups, but this improved with the concomitant addition of compounds with SH-groups but not antioxidants without SH-groups. In addition, UV-spectrum analysis suggested that CoQ0 could rapidly form S-conjugated adducts with compounds with SH-groups by Michael addition. On the other hand, enzyme activities of both glyceraldehyde-3-phosphate dehydrogenase, which has a Cys residue in the active site, and α-ketoglutarate dehydrogenase complex, which requires cofactors with SH-groups, CoA and protein-bound α-lipoic acid, and CoA and ATP contents in the cells were significantly decreased by the addition of CoQ0 but not CoQ1. Furthermore, the decrease of an endogenous antioxidant, glutathione (GSH), by CoQ0 treatment was much greater than the predicted increase of endogenous GSH disulfide. These results suggest that CoQ0 rapidly forms S-conjugate adducts with these endogenous non-protein and protein-associated SH-groups of HeLa cells, which disrupts carbohydrate metabolism followed by intracellular ATP depletion and necrotic cell death.
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Affiliation(s)
- Takayuki Takahashi
- Laboratory of Biochemistry, Department of Health Science and Social Pharmacy, Faculty of Pharmaceutical Sciences, Kobe Gakuin University
| | - Yukitoshi Mine
- Laboratory of Biochemistry, Department of Health Science and Social Pharmacy, Faculty of Pharmaceutical Sciences, Kobe Gakuin University
| | - Tadashi Okamoto
- Laboratory of Biochemistry, Department of Health Science and Social Pharmacy, Faculty of Pharmaceutical Sciences, Kobe Gakuin University
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Takahashi T, Mine Y, Okamoto T. Intracellular reduction of coenzyme Q homologues with a short isoprenoid side chain induces apoptosis of HeLa cells. J Biochem 2018; 163:329-339. [PMID: 29319808 DOI: 10.1093/jb/mvy002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Accepted: 10/21/2017] [Indexed: 11/13/2022] Open
Abstract
Coenzyme Q (CoQ) is an essential factor of the mitochondrial respiratory chain. CoQ homologues with different lengths of the isoprenoid side chain are widely distributed in nature, but little is known about the relationship between the isoprenoid side chain length and biological function; therefore, we examined the effects of CoQ homologues on HeLa cells. When CoQ homologues with a shorter isoprenoid side chain than CoQ4 were added to HeLa cells, they induced cell death, and the order of cytotoxic intensity was as follows: CoQ0 ≫ CoQ3 ≈ CoQ1 > CoQ2 ≫ CoQ4. Furthermore, we found that CoQ1, CoQ2 and CoQ3 could induce caspase-mediated apoptosis, and the order of intensity was as follows: CoQ3 > CoQ2 ≥ CoQ1. We could not identify the participation of reactive oxygen species in the apoptosis induction, but observed that an NAD(P)H dehydrogenase (quinone) 1 (NQO1) inhibitor, dicumarol, could inhibit not only the intracellular reduction of the homologues but also apoptosis. However, because dicumarol did not affect well-known apoptosis inducers, such as anti-Fas IgG, tumor necrosis factor (TNF)-α, TNF-related apoptosis-inducing ligand, UV-B and H2O2 of HeLa cells at all, we concluded that NQO1-related intracellular reduction of CoQ, or its reduced product, ubiquinol, may participate in the apoptosis induction of HeLa cells.
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Affiliation(s)
- Takayuki Takahashi
- Laboratory of Biochemistry, Department of Health Science and Social Pharmacy, Faculty of Pharmaceutical Sciences, Kobe Gakuin University, 1-1-3 Minatojima, Chuo-ku, Kobe 650-8586, Japan
| | - Yukitoshi Mine
- Laboratory of Biochemistry, Department of Health Science and Social Pharmacy, Faculty of Pharmaceutical Sciences, Kobe Gakuin University, 1-1-3 Minatojima, Chuo-ku, Kobe 650-8586, Japan
| | - Tadashi Okamoto
- Laboratory of Biochemistry, Department of Health Science and Social Pharmacy, Faculty of Pharmaceutical Sciences, Kobe Gakuin University, 1-1-3 Minatojima, Chuo-ku, Kobe 650-8586, Japan
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In vitro and in vivo anti-tumor activity of CoQ0 against melanoma cells: inhibition of metastasis and induction of cell-cycle arrest and apoptosis through modulation of Wnt/β-catenin signaling pathways. Oncotarget 2017; 7:22409-26. [PMID: 26968952 PMCID: PMC5008369 DOI: 10.18632/oncotarget.7983] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Accepted: 02/23/2016] [Indexed: 12/13/2022] Open
Abstract
Coenzyme Q0 (CoQ0, 2,3-dimethoxy-5-methyl-1,4-benzoquinone), a novel quinone derivative, has been shown to modulate cellular redox balance. However, effect of this compound on melanoma remains unclear. This study examined the in vitro or in vivo anti-tumor, apoptosis, and anti-metastasis activities of CoQ0 (0-20 μM) through inhibition of Wnt/β-catenin signaling pathway. CoQ0 exhibits a significant cytotoxic effect on melanoma cell lines (B16F10, B16F1, and A2058), while causing little toxicity toward normal (HaCaT) cells. The suppression of β-catenin was seen with CoQ0 administration accompanied by a decrease in the expression of Wnt/β-catenin transcriptional target c-myc, cyclin D1, and survivin through GSK3β-independent pathway. We found that CoQ0 treatment caused G1 cell-cycle arrest by reducing the levels of cyclin E and CDK4. Furthermore, CoQ0 treatment induced apoptosis through caspase-9/-3 activation, PARP degradation, Bcl-2/Bax dysregulation, and p53 expression. Notably, non- or sub-cytotoxic concentrations of CoQ0 markedly inhibited migration and invasion, accompanied by the down-regulation of MMP-2 and -9, and up-regulation of TIMP-1 and -2 expressions in highly metastatic B16F10 cells. Furthermore, the in vivo study results revealed that CoQ0 treatment inhibited the tumor growth in B16F10 xenografted nude mice. Histological analysis and western blotting confirmed that CoQ0 significantly decreased the xenografted tumor progression as demonstrated by induction of apoptosis, suppression of β-catenin, and inhibition of cell cycle-, apoptotic-, and metastatic-regulatory proteins. The data suggest that CoQ0 unveils a novel mechanism by down-regulating Wnt/β-catenin pathways and could be used as a potential lead compound for melanoma chemotherapy.
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Anti-angiogenic properties of coenzyme Q0 through downregulation of MMP-9/NF-κB and upregulation of HO-1 signaling in TNF-α-activated human endothelial cells. Biochem Pharmacol 2015; 98:144-56. [PMID: 26348871 DOI: 10.1016/j.bcp.2015.09.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Accepted: 09/02/2015] [Indexed: 01/13/2023]
Abstract
Various coenzyme Q (CoQ) analogs have been reported as anti-inflammatory and antioxidant substances. However, coenzyme Q0 (CoQ0, 2,3-dimethoxy-5-methyl-1,4-benzoquinone), a novel quinone derivative, has not been well studied for its pharmacological efficacies, and its response to cytokine stimulation remains unclear. Therefore, we investigated the potential anti-angiogenic properties of CoQ0 in human endothelial (EA.hy 926) cells against tumor necrosis factor-α (TNF-α) stimulation. We found that the non-cytotoxic concentrations of CoQ0 (2.5-10μM) significantly suppressed the TNF-α-induced migration/invasion and tube formation abilities of endothelial cells. CoQ0 suppressed TNF-α-induced activity and protein expressions of matrix metalloproteinase-9 (MMP-9) and intercellular adhesion molecule-1 (ICAM-1) followed by an abridged adhesion of U937 leukocytes to endothelial cells. CoQ0 treatment remarkably downregulated TNF-α-induced nuclear translocation and transcriptional activation of nuclear factor-κB (NF-κB) possibly through suppressed I-κBα degradation. Furthermore, CoQ0 triggered the expressions of heme oxygenase-1 (HO-1) and γ-glutamylcysteine synthetase (γ-GCLC), followed by an increased nuclear accumulation of NF-E2 related factor-2 (Nrf2)/antioxidant response element (ARE) activity. In agreement with these, intracellular glutathione levels were significantly increased in CoQ0 treated cells. More interestingly, knockdown of HO-1 gene by specific shRNA showed diminished anti-angiogenic effects of CoQ0 against TNF-α-induced invasion, tube formation and adhesion of leukocyte to endothelial cells. Our findings reveal that CoQ0 protective effects against cytokine-stimulation are mediated through the suppression of MMP-9/NF-κB and/or activation of HO-1 signaling cascades. This novel finding emphasizes the pharmacological efficacies of CoQ0 to treat inflammation and angiogenesis.
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Coenzyme Q0 from Antrodia cinnamomea in Submerged Cultures Induces Reactive Oxygen Species-Mediated Apoptosis in A549 Human Lung Cancer Cells. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2014; 2014:246748. [PMID: 25431605 PMCID: PMC4241310 DOI: 10.1155/2014/246748] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Revised: 09/12/2014] [Accepted: 09/16/2014] [Indexed: 01/05/2023]
Abstract
We investigated the anticancer effects of Antrodia cinnamomea, a medicinal mushroom from Taiwan, on A549 human lung cancer cells using the ethyl acetate extract from submerged culture filtrates. Our results showed that 2,3-dimethoxy-5-methyl-1,4-benzoquinone (coenzyme Q0; CoQ0) derived from A. cinnamomea submerged culture filtrates has anticancer activity. CoQ0 treatment reduced the viability of A549, HepG2, and SW480 cancer cell lines. Furthermore, CoQ0 induced reactive oxygen species (ROS) generation and apoptosis in A549 cells, which was inhibited by the antioxidant ascorbic acid. To our knowledge, these data demonstrate for the first time that CoQ0 derived from A. cinnamomea submerged culture filtrates exerts its anticancer effect through the induction of ROS-mediated apoptosis in A549 human lung cancer cells.
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MacDonald MJ, Langberg EC, Tibell A, Sabat G, Kendrick MA, Szweda LI, Ostenson CG. Identification of ATP synthase as a lipid peroxide protein adduct in pancreatic islets from humans with and without type 2 diabetes mellitus. J Clin Endocrinol Metab 2013; 98:E727-31. [PMID: 23463654 PMCID: PMC3615212 DOI: 10.1210/jc.2012-4203] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
CONTEXT Most current knowledge of pancreatic islet pathophysiology in diabetes mellitus has come from animal models. Even though islets from humans are readily available, only a few come from diabetic donors. We had the uncommon opportunity to acquire islets from humans with type 2 diabetes and used it to perform a study not previously done with human or animal islets. OBJECTIVES Oxidative stress has been proposed as a mechanism for impaired β-cell function in type 2 diabetes. Lipid peroxides caused by reactive oxygen species are damaging to body tissues. The objective was to determine whether lipid peroxide-protein adducts occur in pancreatic islets of humans with type 2 diabetes. DESIGN Immunoblots with two antibodies to hydroxynonenal and 2 other antibodies we generated against reactive small aliphatic compounds were used to detect lipid peroxide-protein adducts in islets of patients with type 2 diabetes and controls. RESULTS The antibodies reacted strongly to ≥5 islet proteins. The major hydroxynonenal adduct in the islets of type 2 diabetes patients was a 52-kDa protein seen with all 4 antibodies that was also seen in islets of nondiabetic humans, rat islets, and insulinoma cells and in mitochondria of various rat tissues. Nano-LC-MS/MS (liquid chromatography-tandem mass spectrometry) and MALDI-TOF (matrix-assisted laser desorption/ionization-time of flight) analysis identified the protein as the β-chain of the mitochondrial F-ATP synthase, an enzyme responsible for 95% of ATP formed in tissues. CONCLUSIONS Lipid peroxide-protein adducts occur in β-cells in the nondiabetic state and in diabetes. Lipid peroxidation is thought to be damaging to tissues. Analogous to various other unhealthy characteristics, the presence in nondiabetic individuals of lipid peroxide-protein adducts does not necessarily indicate they are not detrimental.
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Affiliation(s)
- M J MacDonald
- Childrens Diabetes Center, University of Wisconsin School of Medicine and Public Health, Madison, WI 53706, USA.
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Miller JA, Runkle SA, Tjalkens RB, Philbert MA. 1,3-Dinitrobenzene-induced metabolic impairment through selective inactivation of the pyruvate dehydrogenase complex. Toxicol Sci 2011; 122:502-11. [PMID: 21551353 DOI: 10.1093/toxsci/kfr102] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Prolonged exposure to the chemical intermediate, 1,3-dinitrobenzene (1,3-DNB), produces neuropathology in the central nervous system of rodents analogous to that observed in various conditions of acute energy deprivation including thiamine deficiency and Leigh's necrotizing encephalopathy. Increased production of reactive intermediates in addition to induction of oxidative stress has been implicated in the neurotoxic mechanism of 1,3-DNB, but a clear metabolic target has not been determined. Here we propose that similar to thiamine deficiency, the effects of 1,3-DNB on metabolic status may be due to inhibition of the thiamine-dependent α-ketoacid dehydrogenase complexes. The effects of 1,3-DNB on astroglial metabolic status and α-ketoacid dehydrogenase activity were evaluated using rat C6 glioma cells. Exposure to 1,3-DNB resulted in altered morphology and biochemical dysfunction consistent with disruption of oxidative energy metabolism. Cotreatment with acetyl-carnitine or acetoacetate attenuated morphological and metabolic effects of 1,3-DNB exposure as well as increased cell viability. 1,3-DNB exposure inhibited pyruvate dehydrogenase complex (PDHc) and the inhibition correlated with the loss of lipoic acid (LA) immunoreactivity, suggesting that modification of LA is a potential mechanism of inhibition. Treatment with antioxidants and thiol-containing compounds failed to protect against loss of LA. Alternatively, inhibition of dihydrolipoamide dehydrogenase, the E3 component of the complex attenuated loss of LA. Collectively, these data suggest that 1,3-DNB impairs oxidative energy metabolism through direct inhibition of the PDHc and that this impairment is due to perturbations in the function of protein-bound LA.
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Affiliation(s)
- James A Miller
- Center for Environmental Medicine, Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, Colorado 80523, USA
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Bunik VI, Schloss JV, Pinto JT, Dudareva N, Cooper AJL. A survey of oxidative paracatalytic reactions catalyzed by enzymes that generate carbanionic intermediates: implications for ROS production, cancer etiology, and neurodegenerative diseases. ADVANCES IN ENZYMOLOGY AND RELATED AREAS OF MOLECULAR BIOLOGY 2011; 77:307-60. [PMID: 21692372 DOI: 10.1002/9780470920541.ch7] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Victoria I Bunik
- School of Bioinformatics and Bioengineering, and Belozersky Institute of Physico-Chemical Biology, Moscow Lomonosov State University, Moscow, Russian Federation
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Padilla S, Tran UC, Jiménez-Hidalgo M, López-Martín JM, Martín-Montalvo A, Clarke CF, Navas P, Santos-Ocaña C. Hydroxylation of demethoxy-Q6 constitutes a control point in yeast coenzyme Q6 biosynthesis. Cell Mol Life Sci 2009; 66:173-86. [PMID: 19002377 PMCID: PMC3070445 DOI: 10.1007/s00018-008-8547-7] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Coenzyme Q is a lipid molecule required for respiration and antioxidant protection. Q biosynthesis in Saccharomyces cerevisiae requires nine proteins (Coq1p-Coq9p). We demonstrate in this study that Q levels are modulated during growth by its conversion from demethoxy-Q (DMQ), a late intermediate. Similar conversion was produced when cells were subjected to oxidative stress conditions. Changes in Q(6)/DMQ(6) ratio were accompanied by changes in COQ7 gene mRNA levels encoding the protein responsible for the DMQ hydroxylation, the penultimate step in Q biosynthesis pathway. Yeast coq null mutant failed to accumulate any Q late biosynthetic intermediate. However, in coq7 mutants the addition of exogenous Q produces the DMQ synthesis. Similar effect was produced by over-expressing ABC1/COQ8. These results support the existence of a biosynthetic complex that allows the DMQ(6) accumulation and suggest that Coq7p is a control point for the Q biosynthesis regulation in yeast.
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Affiliation(s)
- S. Padilla
- Centro Andaluz de Biología del Desarrollo, Universidad Pablo de Olavide-CSIC and Centre for Biomedical Research on Rare Diseases (CIBERER), Carretera de Utrera, km 1, ISCIII, 41013 Sevilla, Spain
| | - U. C. Tran
- Department of Chemistry and Biochemistry, UCLA, Los Angeles, 90095 CA USA
| | - M. Jiménez-Hidalgo
- Centro Andaluz de Biología del Desarrollo, Universidad Pablo de Olavide-CSIC and Centre for Biomedical Research on Rare Diseases (CIBERER), Carretera de Utrera, km 1, ISCIII, 41013 Sevilla, Spain
| | - J. M. López-Martín
- Centro Andaluz de Biología del Desarrollo, Universidad Pablo de Olavide-CSIC and Centre for Biomedical Research on Rare Diseases (CIBERER), Carretera de Utrera, km 1, ISCIII, 41013 Sevilla, Spain
| | - A. Martín-Montalvo
- Centro Andaluz de Biología del Desarrollo, Universidad Pablo de Olavide-CSIC and Centre for Biomedical Research on Rare Diseases (CIBERER), Carretera de Utrera, km 1, ISCIII, 41013 Sevilla, Spain
| | - C. F. Clarke
- Department of Chemistry and Biochemistry, UCLA, Los Angeles, 90095 CA USA
| | - P. Navas
- Centro Andaluz de Biología del Desarrollo, Universidad Pablo de Olavide-CSIC and Centre for Biomedical Research on Rare Diseases (CIBERER), Carretera de Utrera, km 1, ISCIII, 41013 Sevilla, Spain
| | - C. Santos-Ocaña
- Centro Andaluz de Biología del Desarrollo, Universidad Pablo de Olavide-CSIC and Centre for Biomedical Research on Rare Diseases (CIBERER), Carretera de Utrera, km 1, ISCIII, 41013 Sevilla, Spain
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Coenzyme Q0 induces apoptosis and modulates the cell cycle in estrogen receptor negative breast cancer cells. Anticancer Drugs 2009; 20:33-40. [DOI: 10.1097/cad.0b013e328314b5c5] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Abstract
Tau aggregation is a common feature of tauopathies such as Alzheimer disease (AD). In AD, tau assembles into fibrillar polymers; it may also be present in other aberrant aggregates, including Hirano bodies. The mechanisms leading to tau polymerization in vivo are not understood. In this study, we found that coenzyme Q (ubiquinone) facilitates tau aggregation after binding to tau molecules at the region of the tau molecule involved in self-assembly. Consequently, after tau-tau interactions, this region is masked in fibrillar tau polymers. Further in vitro studies showed that ubiquinone facilitates the interaction of tau protein with actin to form structures that are morphologically similar to Hirano bodies. Finally, studies in AD brains show that Hirano bodies react with an antibody raised against ubiquinone, indicating that ubiquinone is a component of Hirano bodies. Taken together, the in vitro models and findings in AD suggest that in the presence of ubiquinone, Hirano bodies may result from the interaction of actin and other proteins, including tau.
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Modification of respiratory-chain enzyme activities in brown adipose tissue mitochondria by idebenone (hydroxydecyl-ubiquinone). J Bioenerg Biomembr 2008; 40:85-93. [PMID: 18368470 DOI: 10.1007/s10863-008-9134-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2007] [Accepted: 02/18/2008] [Indexed: 10/22/2022]
Abstract
Idebenone (IDE), a synthetic analog of coenzyme Q, strongly activates glycerol phosphate (GP) oxidation in brown adipose tissue mitochondria. GP oxidase, GP cytochrome c oxidoreductase and GP dehydrogenase activities were all significantly stimulated by 13 muM IDE. Substituted derivatives of IDE acetyl- and methoxyidebenone had similar activating effects. When succinate was used as substrate, no activation by IDE could be observed. The activation effect of IDE could be explained as release of the inhibition of glycerol phosphate dehydrogenase by endogenous free fatty acids. NADH oxidoreductase activity and oxidation of NADH-dependent substrates were inhibited by IDE. The extent of the inhibition and IDE concentration dependence varied when various substrates were tested, being highest for pyruvate and lowest for 2-oxoglutarate. This study thus showed that the effect of IDE on various mitochondrial enzymes is very different and thus its therapeutic use should take into account its specific effect on various mitochondrial dehydrogenases in relation to particular defects of mitochondrial respiratory chain.
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Bunik VI, Schloss JV, Pinto JT, Gibson GE, Cooper AJL. Enzyme-Catalyzed Side Reactions with Molecular Oxygen may Contribute to Cell Signaling and Neurodegenerative Diseases. Neurochem Res 2007; 32:871-91. [PMID: 17342415 DOI: 10.1007/s11064-006-9239-z] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2006] [Accepted: 11/22/2006] [Indexed: 02/07/2023]
Abstract
A link between neurodegeneration and well-characterized enzymatic and non-enzymatic reactions that produce reactive oxygen species (ROS) from O(2) is well established. Several enzymes that contain pyridoxal 5'-phosphate (PLP) or thiamine diphosphate (ThDP) catalyze side reactions (paracatalytic reactions) in the presence of ambient O(2). These side reactions produce oxidants such as hydrogen peroxide [H(2)O(2)] or extremely reactive peracids [RC(O)OOH]. We hypothesize that although these enzymes normally produce oxidants at low or undetectable levels, changes in substrate levels or disease-induced structural alterations may enhance interactions with O(2), thereby generating higher levels of reactive oxidants. These oxidants may damage the enzymes producing them, alter nearby macromolecules and/or destroy important metabolites/coenzymes. We propose that paracatalytic reactions with O(2) catalyzed by PLP-dependent decarboxylases and by ThDP-dependent enzymes within the alpha-keto acid dehydrogenase complexes may contribute to normal cellular signaling and to cellular damage in neurodegenerative diseases.
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Affiliation(s)
- Victoria I Bunik
- School of Bioengineering and Bioinformatics, and Belozersky Institute of Physico-Chemical Biology, Moscow State University, Moscow 119992, Russia
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Scott GK, Atsriku C, Kaminker P, Held J, Gibson B, Baldwin MA, Benz CC. Vitamin K3 (Menadione)-Induced Oncosis Associated with Keratin 8 Phosphorylation and Histone H3 Arylation. Mol Pharmacol 2005; 68:606-15. [PMID: 15939799 DOI: 10.1124/mol.105.013474] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The vitamin K analog menadione (K3), capable of both redox cycling and arylating nucleophilic substrates by Michael addition, has been extensively studied as a model stress-inducing quinone in both cell culture and animal model systems. Exposure of keratin 8 (k-8) expressing human breast cancer cells (MCF7, T47D, SKBr3) to K3 (50-100 microM) induced rapid, sustained, and site-specific k-8 serine phosphorylation (pSer73) dependent on signaling by a single mitogen activated protein kinase (MAPK) pathway, MEK1/2. Normal nuclear morphology and k-8 immunofluorescence coupled with the lack of DNA laddering or other features of apoptosis indicated that K3-induced cytotoxicity, evident within 4 h of treatment and delayed but not prevented by MEK1/2 inhibition, was due to a form of stress-activated cell death known as oncosis. Independent of MAPK signaling was the progressive appearance of K3-induced cellular fluorescence, principally nuclear in origin and suggested by in vitro fluorimetry to have been caused by K3 thiol arylation. Imaging by UV transillumination of protein gels containing nuclear extracts from K3-treated cells revealed a prominent 17-kDa band shown to be histone H3 by immunoblotting and mass spectrometry (MS). K3 arylation of histones in vitro followed by electrospray ionization-tandem MS analyses identified the unique Cys110 residue within H3, exposed only in the open chromatin of transcriptionally active genes, as a K3 arylation target. These findings delineate new pathways associated with K3-induced stress and suggest a potentially novel role for H3 Cys110 as a nuclear stress sensor.
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Affiliation(s)
- Gary K Scott
- Program of Cancer and Developmental Therapeutics, Buck Institute for Age Research, 8001 Red-wood Blvd., Novato, CA 94945, USA
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