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Watson PR, Stollmaier JG, Christianson DW. Crystal structure of histone deacetylase 6 complexed with (R)-lipoic acid, an essential cofactor in central carbon metabolism. J Biol Chem 2023; 299:105228. [PMID: 37703993 PMCID: PMC10622836 DOI: 10.1016/j.jbc.2023.105228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 08/28/2023] [Accepted: 09/06/2023] [Indexed: 09/15/2023] Open
Abstract
The enzyme cofactor (R)-lipoic acid plays a critical role in central carbon metabolism due to its catalytic function in the generation of acetyl-CoA, which links glycolysis with the tricarboxylic acid cycle. This cofactor is also essential for the generation of succinyl CoA within the tricarboxylic acid cycle. However, the biological functions of (R)-lipoic acid extend beyond metabolism owing to its facile redox chemistry. Most recently, the reduced form of (R)-lipoic acid, (R)-dihydrolipoic acid, has been shown to inhibit histone deacetylases (HDACs) with selectivity for the inhibition of HDAC6. Here, we report the 2.4 Å-resolution X-ray crystal structure of the complex between (R)-dihydrolipoic acid and HDAC6 catalytic domain 2 from Danio rerio, and we report a dissociation constant (KD) of 350 nM for this complex as determined by isothermal titration calorimetry. The crystal structure illuminates key affinity determinants in the enzyme active site, including thiolate-Zn2+ coordination and S-π interactions in the F583-F643 aromatic crevice. This study provides the first visualization of the connection between HDAC function and the biological response to oxidative stress: the dithiol moiety of (R)-dihydrolipoic acid can serve as a redox-regulated pharmacophore capable of simultaneously targeting the catalytic Zn2+ ion and the aromatic crevice in the active site of HDAC6.
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Affiliation(s)
- Paris R Watson
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Juana Goulart Stollmaier
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - David W Christianson
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania, United States.
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2
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Watson PR, Stollmaier JG, Christianson DW. Crystal Structure of Histone Deacetylase 6 Complexed with ( R )-Lipoic Acid, an Essential Cofactor in Central Carbon Metabolism. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.08.08.552419. [PMID: 37609266 PMCID: PMC10441330 DOI: 10.1101/2023.08.08.552419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/24/2023]
Abstract
The enzyme cofactor ( R )-lipoic acid plays a critical role in central carbon metabolism due to its catalytic function in the generation of acetyl-CoA, which links glycolysis with the tricarboxylic acid cycle. This cofactor is also essential for the generation of succinyl CoA within the tricarboxylic acid cycle. However, the biological functions of ( R )-lipoic acid extend beyond metabolism owing to its facile redox chemistry. Most recently, the reduced form of ( R )-lipoic acid, ( R )-dihydrolipoic acid, has been shown to inhibit histone deacetylases (HDACs) with selectivity for the inhibition of HDAC6. Here, we report the 2.4 Å-resolution X-ray crystal structure of the HDAC6-( R )-dihydrolipoic acid complex, and we report a dissociation constant (K D ) of 350 nM for this complex as determined by isothermal titration calorimetry. The crystal structure illuminates key affinity determinants in the enzyme active site, including thiolate-Zn 2+ coordination and S-π interactions in the F583-F643 aromatic crevice. This study provides the first visualization of the connection between HDAC function and the biological response to oxidative stress: the dithiol moiety of ( R )-dihydrolipoic acid can serve as a redox-regulated pharmacophore capable of simultaneously targeting the catalytic Zn 2+ ion and the aromatic crevice in the active site of HDAC6.
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Affiliation(s)
- Paris R. Watson
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, PA 19104-6323, United States
| | - Juana Goulart Stollmaier
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, PA 19104-6323, United States
| | - David W. Christianson
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, PA 19104-6323, United States
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3
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Olson KR, Derry PJ, Kent TA, Straub KD. The Effects of Antioxidant Nutraceuticals on Cellular Sulfur Metabolism and Signaling. Antioxid Redox Signal 2023; 38:68-94. [PMID: 35819295 PMCID: PMC9885552 DOI: 10.1089/ars.2022.0077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Accepted: 06/23/2022] [Indexed: 02/03/2023]
Abstract
Significance: Nutraceuticals are ingested for health benefits, in addition to their general nutritional value. These dietary supplements have become increasingly popular since the late 20th century and they are a rapidly expanding global industry approaching a half-trillion U.S. dollars annually. Many nutraceuticals are promulgated as potent antioxidants. Recent Advances: Experimental support for the efficacy of nutraceuticals has lagged behind anecdotal exuberance. However, accumulating epidemiological evidence and recent, well-controlled clinical trials are beginning to support earlier animal and in vitro studies. Although still somewhat limited, encouraging results have been suggested in essentially all organ systems and against a wide range of pathophysiological conditions. Critical Issues: Health benefits of "antioxidant" nutraceuticals are largely attributed to their ability to scavenge oxidants. This has been criticized based on several factors, including limited bioavailability, short tissue retention time, and the preponderance of endogenous antioxidants. Recent attention has turned to nutraceutical activation of downstream antioxidant systems, especially the Keap1/Nrf2 (Kelch like ECH associated protein 1/nuclear factor erythroid 2-related factor 2) axis. The question now becomes, how do nutraceuticals activate this axis? Future Directions: Reactive sulfur species (RSS), including hydrogen sulfide (H2S) and its metabolites, are potent activators of the Keap1/Nrf2 axis and avid scavengers of reactive oxygen species. Evidence is beginning to accumulate that a variety of nutraceuticals increase cellular RSS by directly providing RSS in the diet, or through a number of catalytic mechanisms that increase endogenous RSS production. We propose that nutraceutical-specific targeting of RSS metabolism will lead to the design and development of even more efficacious antioxidant therapeutic strategies. Antioxid. Redox Signal. 38, 68-94.
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Affiliation(s)
- Kenneth R. Olson
- Department of Physiology, Indiana University School of Medicine—South Bend, South Bend, Indiana, USA
- Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana, USA
| | - Paul J. Derry
- Center for Genomics and Precision Medicine, Institute of Biosciences and Technology, Texas A&M Health Science Center, Houston, Texas, USA
| | - Thomas A. Kent
- Center for Genomics and Precision Medicine, Institute of Biosciences and Technology, Texas A&M Health Science Center, Houston, Texas, USA
- Department of Chemistry, Rice University, Houston, Texas, USA
- Stanley H. Appel Department of Neurology, Houston Methodist Hospital and Research Institute, Houston, Texas, USA
| | - Karl D. Straub
- Central Arkansas Veteran's Healthcare System, Little Rock, Arkansas, USA
- Department of Medicine and Biochemistry, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
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4
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He B, Wang Z, Moreau R. Chylomicron production is repressed by RPTOR knockdown, R-α-lipoic acid and 4-phenylbutyric acid in human enterocyte-like Caco-2 cells. J Nutr Biochem 2022; 108:109087. [PMID: 35691593 DOI: 10.1016/j.jnutbio.2022.109087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 03/28/2022] [Accepted: 05/14/2022] [Indexed: 10/18/2022]
Abstract
Although the role of mechanistic target of rapamycin complex 1 (mTORC1) in lipid metabolism has been the subject of previous research, its function in chylomicron production is not known. In this study, we created three stable human colorectal adenocarcinoma Caco-2 cell lines exhibiting normal, low or high mTORC1 kinase activity, and used these cells to investigate the consequences of manipulating mTORC1 activity on enterocyte differentiation and chylomicron-like particle production. Constitutively active mTORC1 induced Caco-2 cell proliferation and differentiation (as judged by alkaline phosphatase activity) but weakened transepithelial electrical resistance (TEER). Repressed mTORC1 activity due to the knockdown of RPTOR significantly decreased the expression of lipogenic genes FASN, DGAT1 and DGAT2, lipoprotein assembly genes APOB and MTTP, reduced protein expression of APOB, MTTP and FASN, downregulated the gene expression of very long-chain fatty acyl-CoA ligase (FATP2), acyl-CoA binding protein (DBI), and prechylomicron transport vesicle-associated proteins VAMP7 (vesicle-associated membrane protein 7) and SAR1B (secretion associated Ras related GTPase 1B) resulting in the repression of apoB-containing triacylglycerol-rich lipoprotein secretion. Exposure of Caco-2 cells harboring a constitutively active mTORC1 to short-chain fatty acid derivatives, R-α-lipoic acid and 4-phenylbutyric acid, downregulated chylomicron-like particle secretion by interfering with the lipidation and assembly of the particles, and concomitantly repressed mTORC1 activity with no change to Raptor abundance or PRAS40 (Thr246) phosphorylation. R-α-lipoic acid and 4-phenylbutyric acid may be useful to mitigate intestinal lipoprotein overproduction and associated postprandial inflammation.
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Affiliation(s)
- Bo He
- Department of Nutrition & Health Sciences, University of Nebraska-Lincoln, Lincoln, NE 68583, USA
| | - Zhigang Wang
- Department of Nutrition & Health Sciences, University of Nebraska-Lincoln, Lincoln, NE 68583, USA
| | - Régis Moreau
- Department of Nutrition & Health Sciences, University of Nebraska-Lincoln, Lincoln, NE 68583, USA.
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Gao J, Ma L, Yin J, Liu G, Ma J, Xia S, Gong S, Han Q, Li T, Chen Y, Yin Y. Camellia ( Camellia oleifera bel.) seed oil reprograms gut microbiota and alleviates lipid accumulation in high fat-fed mice through the mTOR pathway. Food Funct 2022; 13:4977-4992. [PMID: 35452062 DOI: 10.1039/d1fo04075h] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Camellia (Camellia oleifera bel.) seed oil (CO) is extensively used as an edible oil in China and Asian countries owing to its high nutritional and medicinal values. It has been shown that a high-fat diet enhances lipid accumulation and induces intestinal microbiota imbalance in mice. However, it is still to be learned whether CO prevents dyslipidemia through gut microbiota. Here, using 16S rRNA gene sequencing analysis of the gut microbiota, we found that oral CO relieved lipid accumulation and reversed gut microbiota dysbiosis. Compared to mice (C57BL/6J male mice) fed a high-fat diet, treatment with CO regulated the composition and functional profiling communities related to the lipid metabolism of gut microbiota. The abundances of Dubosiella, Lactobacillus, and Alistipes were markedly increased in CO supplementation mice. In addition, the colon levels of isobutyric acid, pentanoic acid, and isovaleric acid were similar between the control and CO supplementation mice. Besides, the results indicated that CO supplementation in mice alleviated lipid droplet accumulation in the hepatocytes and subcutaneous adipose tissue, although the liver index did not show a difference. Notably, CO supplementation for 6 weeks significantly reduced the levels of LDL, TC, and TG, while enhancing the level of HDL in serum and liver. Meanwhile, we also identified that CO supplementation suppressed the mammalian target of rapamycin (mTOR) signaling pathway in high fat-fed (HF-fed) mice. Taken together, our results suggest that CO improved dyslipidemia and alleviated lipid accumulation in HF-fed mice, the molecular mechanisms possibly associated with the reorganization of gut microbiota, in particular, Alistipes and Dubosiella, mediated the inhibition of the mTOR pathway.
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Affiliation(s)
- Jing Gao
- Research Institute of Oil Tea Camellia, Hunan Academy of Forestry, Shao shan South Road, No. 658, Changsha 410004, China. .,National Engineering Research Center for Oil Tea Camellia, Changsha 410004, China.,Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Hunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic Process, Chinese Academy of Sciences, Changsha, Hunan, China.
| | - Li Ma
- Research Institute of Oil Tea Camellia, Hunan Academy of Forestry, Shao shan South Road, No. 658, Changsha 410004, China. .,National Engineering Research Center for Oil Tea Camellia, Changsha 410004, China
| | - Jie Yin
- College of Animal Science and Technology, Hunan Co-Innovation Center of Animal Production Safety, Hunan Agricultural University, Changsha, China
| | - Gang Liu
- College of Animal Science and Technology, Hunan Co-Innovation Center of Animal Production Safety, Hunan Agricultural University, Changsha, China
| | - Jie Ma
- College of Animal Science and Technology, Hunan Co-Innovation Center of Animal Production Safety, Hunan Agricultural University, Changsha, China
| | - SiTing Xia
- College of Animal Science and Technology, Hunan Co-Innovation Center of Animal Production Safety, Hunan Agricultural University, Changsha, China
| | - SaiMing Gong
- College of Animal Science and Technology, Hunan Co-Innovation Center of Animal Production Safety, Hunan Agricultural University, Changsha, China
| | - Qi Han
- College of Animal Science and Technology, Hunan Co-Innovation Center of Animal Production Safety, Hunan Agricultural University, Changsha, China
| | - TieJun Li
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Hunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic Process, Chinese Academy of Sciences, Changsha, Hunan, China.
| | - YongZhong Chen
- Research Institute of Oil Tea Camellia, Hunan Academy of Forestry, Shao shan South Road, No. 658, Changsha 410004, China. .,National Engineering Research Center for Oil Tea Camellia, Changsha 410004, China
| | - YuLong Yin
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Hunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic Process, Chinese Academy of Sciences, Changsha, Hunan, China. .,College of Animal Science and Technology, Hunan Co-Innovation Center of Animal Production Safety, Hunan Agricultural University, Changsha, China
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6
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Dietary and nutraceutical-based therapeutic approaches to combat the pathogenesis of Huntington’s disease. J Funct Foods 2022. [DOI: 10.1016/j.jff.2022.105047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/06/2022] Open
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Petca A, Bot M, Maru N, Calo IG, Borislavschi A, Dumitrascu MC, Petca RC, Sandru F, Zvanca ME. Benefits of α-lipoic acid in high-risk pregnancies (Review). Exp Ther Med 2021; 22:1232. [PMID: 34539828 DOI: 10.3892/etm.2021.10666] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Accepted: 06/15/2021] [Indexed: 12/27/2022] Open
Abstract
α-Lipoic acid (ALA) is a natural molecule that is inconsistently synthesized by the human body and must be provided from exogenous sources, such as food and dietary supplements. Once absorbed, the oxidized form of ALA is transformed into its reduced form, dihydrolipoic acid (DHLA). ALA/DHLA exert direct and indirect antioxidant, anti-inflammatory and fine immunomodulatory effects. ALA/DHLA reduce the levels of pro-inflammatory cytokines (IL-1β, IL-6, IL-8 and IL-17), while increasing the secretion of anti-inflammatory cytokines (IL-10). They also inhibit cyclooxygenase 2, thereby decreasing the secretion of prostaglandin E2 and nitrogen oxide, and reducing the risk of miscarriage in the first trimester of pregnancy. In patients at risk of abortion, administration of ALA from the first trimester has shown efficacy by accelerating subchorionic hematoma resorption, with a significant decrease in the accompanying abdominal pain. ALA has been proven to be efficient in maintaining the length of the cervix and keeping it closed following one episode of premature labor. Preeclampsia is a dysfunction caused by abnormal placentation and an excessive maternal inflammatory response, leading to extreme hypoxia in the placental bed and exaggerated oxidative stress, with release of oxygen free radicals. Oxidative stress plays a key role in the development of preeclampsia and intrauterine growth restriction. The hypothesis of antioxidant supplementation may play an essential part in disease prevention and fetal neuroprotection.
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Affiliation(s)
- Aida Petca
- Department of Obstetrics and Gynecology, 'Carol Davila' University of Medicine and Pharmacy, 050474 Bucharest, Romania.,Department of Obstetrics and Gynecology, Elias Emergency University Hospital, 011461 Bucharest, Romania
| | - Mihaela Bot
- Department of Obstetrics and Gynecology, 'Carol Davila' University of Medicine and Pharmacy, 050474 Bucharest, Romania.,Department of Obstetrics and Gynecology, Elias Emergency University Hospital, 011461 Bucharest, Romania
| | - Nicoleta Maru
- Department of Anatomy, 'Carol Davila' University of Medicine and Pharmacy, 050474 Bucharest, Romania
| | - Ioana Gabriela Calo
- Department of Obstetrics and Gynecology, Elias Emergency University Hospital, 011461 Bucharest, Romania
| | - Andreea Borislavschi
- Department of Obstetrics and Gynecology, Elias Emergency University Hospital, 011461 Bucharest, Romania
| | - Mihai Cristian Dumitrascu
- Department of Obstetrics and Gynecology, 'Carol Davila' University of Medicine and Pharmacy, 050474 Bucharest, Romania.,Department of Obstetrics and Gynecology, University Emergency Hospital, 050098 Bucharest, Romania
| | - Razvan-Cosmin Petca
- Department of Urology, 'Carol Davila' University of Medicine and Pharmacy, 050474 Bucharest, Romania.,Department of Urology, 'Prof. Dr. Th. Burghele' Clinical Hospital, 050659 Bucharest, Romania
| | - Florica Sandru
- Department of Dermatology, 'Carol Davila' University of Medicine and Pharmacy, 050474 Bucharest, Romania.,Department of Dermatology, Elias Emergency University Hospital, 011461 Bucharest, Romania
| | - Mona Elena Zvanca
- Department of Obstetrics and Gynecology, 'Carol Davila' University of Medicine and Pharmacy, 050474 Bucharest, Romania.,Department of Obstetrics and Gynecology, Elias Emergency University Hospital, 011461 Bucharest, Romania
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Kravchenko LV, Aksenov IV, Nikitin NS, Guseva GV, Avrenyeva LI, Trusov NV, Balakina AS, Tutelyan VA. Lipoic Acid Exacerbates Oxidative Stress and Lipid Accumulation in the Liver of Wistar Rats Fed a Hypercaloric Choline-Deficient Diet. Nutrients 2021; 13:1999. [PMID: 34200615 PMCID: PMC8227681 DOI: 10.3390/nu13061999] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 06/04/2021] [Accepted: 06/07/2021] [Indexed: 01/14/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) is currently estimated as the most prevalent chronic liver disease in all age groups. An increasing body of evidence obtained in experimental and clinical data indicates that oxidative stress is the most important pathogenic factor in the development of NAFLD. The study aimed to investigate the impact of α-lipoic acid (LA), widely used as an antioxidant, on the effects of a hypercaloric choline-deficient diet. Male Wistar rats were divided into three groups: control diet (C); hypercaloric choline-deficient diet (HCCD), and hypercaloric choline-deficient diet with α-lipoic acid (HCCD+LA). Supplementation of HCCD with LA for eight weeks led to a decrease in visceral adipose tissue/body weight ratio, the activity of liver glutathione peroxidase and paraoxonase-1, plasma, and liver total antioxidant activity, as well as an increase in liver/body weight ratio, liver total lipid and triglyceride content, and liver transaminase activities compared to the HCCD group without LA. In conclusion, our study shows that α-lipoic acid detains obesity development but exacerbates the severity of diet-induced oxidative stress and lipid accumulation in the liver of male Wistar rats fed a hypercaloric choline-deficient diet.
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Affiliation(s)
- Lidia V. Kravchenko
- Federal Research Centre of Nutrition and Biotechnology, 2/14 Ustinsky Passage, 109240 Moscow, Russia; (L.V.K.); (N.S.N.); (G.V.G.); (L.I.A.); (N.V.T.); (A.S.B.); (V.A.T.)
| | - Ilya V. Aksenov
- Federal Research Centre of Nutrition and Biotechnology, 2/14 Ustinsky Passage, 109240 Moscow, Russia; (L.V.K.); (N.S.N.); (G.V.G.); (L.I.A.); (N.V.T.); (A.S.B.); (V.A.T.)
| | - Nikolay S. Nikitin
- Federal Research Centre of Nutrition and Biotechnology, 2/14 Ustinsky Passage, 109240 Moscow, Russia; (L.V.K.); (N.S.N.); (G.V.G.); (L.I.A.); (N.V.T.); (A.S.B.); (V.A.T.)
| | - Galina V. Guseva
- Federal Research Centre of Nutrition and Biotechnology, 2/14 Ustinsky Passage, 109240 Moscow, Russia; (L.V.K.); (N.S.N.); (G.V.G.); (L.I.A.); (N.V.T.); (A.S.B.); (V.A.T.)
| | - Ludmila I. Avrenyeva
- Federal Research Centre of Nutrition and Biotechnology, 2/14 Ustinsky Passage, 109240 Moscow, Russia; (L.V.K.); (N.S.N.); (G.V.G.); (L.I.A.); (N.V.T.); (A.S.B.); (V.A.T.)
| | - Nikita V. Trusov
- Federal Research Centre of Nutrition and Biotechnology, 2/14 Ustinsky Passage, 109240 Moscow, Russia; (L.V.K.); (N.S.N.); (G.V.G.); (L.I.A.); (N.V.T.); (A.S.B.); (V.A.T.)
| | - Anastasia S. Balakina
- Federal Research Centre of Nutrition and Biotechnology, 2/14 Ustinsky Passage, 109240 Moscow, Russia; (L.V.K.); (N.S.N.); (G.V.G.); (L.I.A.); (N.V.T.); (A.S.B.); (V.A.T.)
| | - Victor A. Tutelyan
- Federal Research Centre of Nutrition and Biotechnology, 2/14 Ustinsky Passage, 109240 Moscow, Russia; (L.V.K.); (N.S.N.); (G.V.G.); (L.I.A.); (N.V.T.); (A.S.B.); (V.A.T.)
- FSAEI HE I.M. Sechenov First MSMU MOH Russia (Sechenovskiy University), 8-2 Trubetskaya Street, 119991 Moscow, Russia
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9
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Hajizadeh-Sharafabad F, Sharifi Zahabi E. Role of alpha-lipoic acid in vascular function: A systematic review of human intervention studies. Crit Rev Food Sci Nutr 2020; 62:2928-2941. [DOI: 10.1080/10408398.2020.1861425] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Fatemeh Hajizadeh-Sharafabad
- Nutrition Research Center, Department of Clinical Nutrition, Faculty of Nutrition and Food Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
- Student Research Committee, Faculty of Nutrition and Food Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Elham Sharifi Zahabi
- Department of Nutrition, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
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10
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He B, Moreau R. R-α-Lipoic Acid and 4-Phenylbutyric Acid Have Distinct Hypolipidemic Mechanisms in Hepatic Cells. Biomedicines 2020; 8:biomedicines8080289. [PMID: 32824248 PMCID: PMC7460023 DOI: 10.3390/biomedicines8080289] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 08/07/2020] [Accepted: 08/14/2020] [Indexed: 11/16/2022] Open
Abstract
The constitutive activation of the mechanistic target of rapamycin complex 1 (mTORC1) leads to the overproduction of apoB-containing triacylglycerol-rich lipoproteins in HepG2 cells. R-α-lipoic acid (LA) and 4-phenylbutyric acid (PBA) have hypolipidemic function but their mechanisms of action are not well understood. Here, we reported that LA and PBA regulate hepatocellular lipid metabolism via distinct mechanisms. The use of SQ22536, an inhibitor of adenylyl cyclase, revealed cAMP’s involvement in the upregulation of CPT1A expression by LA but not by PBA. LA decreased the secretion of proprotein convertase subtilisin/kexin type 9 (PCSK9) in the culture media of hepatic cells and increased the abundance of LDL receptor (LDLR) in cellular extracts in part through transcriptional upregulation. Although PBA induced LDLR gene expression, it did not translate into more LDLR proteins. PBA regulated cellular lipid homeostasis through the induction of CPT1A and INSIG2 expression via an epigenetic mechanism involving the acetylation of histone H3, histone H4, and CBP-p300 at the CPT1A and INSIG2 promoters.
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Pang L, Deng P, Liang YD, Qian JY, Wu LC, Yang LL, Yu ZP, Zhou Z. Lipoic acid antagonizes paraquat-induced vascular endothelial dysfunction by suppressing mitochondrial reactive oxidative stress. Toxicol Res (Camb) 2019; 8:918-927. [PMID: 32774841 DOI: 10.1039/c9tx00186g] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Accepted: 09/23/2019] [Indexed: 12/19/2022] Open
Abstract
Paraquat (PQ) is a widely used herbicide in the agricultural field. The lack of an effective antidote is the significant cause of high mortality in PQ poisoning. Here, we investigate the antagonistic effects of alpha lipoic acid (α-LA), a naturally existing antioxidant, on PQ toxicity in human microvascular endothelial cells (HMEC-1). All the doses of 250, 500 and 1000 μM α-LA significantly inhibited 1000 μM PQ-induced cytotoxicity in HMEC-1 cells. α-LA pretreatment remarkably diminished the damage to cell migration ability, recovered the declined levels of the vasodilator factor nitric oxide (NO), elevated the expression level of endothelial nitric oxide synthases (eNOS), and inhibited the upregulated expression of vasoconstrictor factor endothelin-1 (ET-1). Moreover, α-LA pretreatment inhibited reactive oxygen species (ROS) generation, suppressed the damage to the mitochondrial membrane potential (ΔΨ m) and mitigated the inhibition of adenosine triphosphate (ATP) production in HMEC-1 cells. These results suggested that α-LA could alleviate PQ-induced endothelial dysfunction by suppressing oxidative stress. In summary, our present study provides novel insight into the protective effects and pharmacological potential of α-LA against PQ toxicity in microvascular endothelial cells.
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Affiliation(s)
- Li Pang
- Department of Cell Biology , School of Life Sciences and School of Medicine , Guangxi University , Nanning 530004 , China .
| | - Ping Deng
- Department of Occupational Health , Third Military Medical University , Chongqing 400038 , China
| | - Yi-Dan Liang
- Department of Cell Biology , School of Life Sciences and School of Medicine , Guangxi University , Nanning 530004 , China .
| | - Jing-Yu Qian
- Department of Cell Biology , School of Life Sciences and School of Medicine , Guangxi University , Nanning 530004 , China .
| | - Li-Chuan Wu
- Department of Cell Biology , School of Life Sciences and School of Medicine , Guangxi University , Nanning 530004 , China .
| | - Ling-Ling Yang
- Department of Occupational Health , Third Military Medical University , Chongqing 400038 , China
| | - Zheng-Ping Yu
- Department of Cell Biology , School of Life Sciences and School of Medicine , Guangxi University , Nanning 530004 , China . .,Department of Occupational Health , Third Military Medical University , Chongqing 400038 , China
| | - Zhou Zhou
- Department of Cell Biology , School of Life Sciences and School of Medicine , Guangxi University , Nanning 530004 , China .
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12
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Haghighatdoost F, Hariri M. Does alpha-lipoic acid affect lipid profile? A meta-analysis and systematic review on randomized controlled trials. Eur J Pharmacol 2019; 847:1-10. [DOI: 10.1016/j.ejphar.2019.01.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 12/22/2018] [Accepted: 01/07/2019] [Indexed: 12/29/2022]
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13
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Valdecantos MP, Pérez-Matute P, Prieto-Hontoria P, Moreno-Aliaga MJ, Martínez JA. Impact of dietary lipoic acid supplementation on liver mitochondrial bioenergetics and oxidative status on normally fed Wistar rats. Int J Food Sci Nutr 2019; 70:834-844. [PMID: 30764676 DOI: 10.1080/09637486.2019.1572716] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The aim of this study was to examine the effects of α-lipoic acid (α-LA) on liver mitochondrial bioenergetics and oxidative status for 8 weeks in normal-healthy animals. A pair-fed group was included to differentiate between α-LA direct effects and those changes due to reduced food intake. α-LA decreased body weight gain, liver weight and insulin levels with no differences compared to its pair-fed group. α-LA significantly reduced energy efficiency, the activity of the electron transport chain complexes and induced a lower efficiency of oxidative phosphorylation with reduced ATP production. α-LA supplementation directly decreased plasma triglycerides (TGs), free fatty acids and ketone bodies levels. A significant reduction in hepatic TG content was also observed. A significant up-regulation of Cpt1a, Acadl and Sirt3, all β-oxidation genes, along with a significant deacetylation of the forkhead transcription factor 3a (FOXO3A) was found in α-LA-treated animals. Thus, α-LA along with a standard chow diet has direct actions on lipid metabolism and liver by modulating mitochondrial function in normal-weight rats. These results should be taken into account when α-LA is administered or recommended to a healthy population.
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Affiliation(s)
- M P Valdecantos
- Instituto de Investigaciones Biomédicas Alberto Sols (Centro Mixto CSIC-UAM) , Madrid , Spain.,Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERdem), Instituto de Salud Carlos III , Madrid , Spain.,Department of Nutrition, Food Science and Physiology, University of Navarra , Pamplona , Spain
| | - P Pérez-Matute
- Department of Nutrition, Food Science and Physiology, University of Navarra , Pamplona , Spain.,Department of Infectious Diseases, Infectious Diseases, Microbiota and Metabolism Unit, Center for Biomedical Research of La Rioja (CIBIR) , Logroño, Spain
| | - P Prieto-Hontoria
- Department of Nutrition, Food Science and Physiology, University of Navarra , Pamplona , Spain
| | - M J Moreno-Aliaga
- Department of Nutrition, Food Science and Physiology, University of Navarra , Pamplona , Spain.,Centre for Nutrition Research, University of Navarra , Pamplona , Spain.,CIBER Fisiopatología de la Obesidad y la Nutrición (CIBERobn) , Madrid , Spain.,IdiSNA, Navarra's Health Research Institute , Pamplona , Spain
| | - J A Martínez
- Department of Nutrition, Food Science and Physiology, University of Navarra , Pamplona , Spain.,Centre for Nutrition Research, University of Navarra , Pamplona , Spain.,CIBER Fisiopatología de la Obesidad y la Nutrición (CIBERobn) , Madrid , Spain.,IdiSNA, Navarra's Health Research Institute , Pamplona , Spain.,IMDEA Food Institute, CEI UAM + CSIC , Madrid , Spain
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14
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Tromba L, Perla FM, Carbotta G, Chiesa C, Pacifico L. Effect of Alpha-Lipoic Acid Supplementation on Endothelial Function and Cardiovascular Risk Factors in Overweight/Obese Youths: A Double-Blind, Placebo-Controlled Randomized Trial. Nutrients 2019; 11:nu11020375. [PMID: 30759784 PMCID: PMC6412308 DOI: 10.3390/nu11020375] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 02/08/2019] [Accepted: 02/08/2019] [Indexed: 12/17/2022] Open
Abstract
Endothelial dysfunction is recognized as an early sign of systemic atherosclerosis, and it represents a therapeutic target to prevent long-term cardiovascular (CV) consequences. Alpha-lipoic acid (ALA) is a commonly used dietary supplement exerting anti-oxidant and anti-inflammatory effects. We investigated whether a three-month treatment with ALA improves endothelial function, as assessed by flow-mediated dilation (FMD) of the brachial artery, and clinical and metabolic risk factors in overweight/obese youths. We enrolled 67 overweight/obese children, and 22 normal-weight metabolically healthy controls. Overweight/obese youths were randomly allocated in a double-blinded manner to receive ALA (n = 34) or placebo (n = 33). Of these, 64 (32 ALA, 32 placebo) completed the follow-up. At baseline, in ALA and placebo groups, FMD was similar, but lower as compared with that in controls (p = 0.045). At three months, within the ALA and placebo groups, FMD did not change significantly. However, the basal and peak diameter of brachial artery significantly increased after ALA treatment as compared to placebo (p = 0.036 and p = 0.01, respectively). There were no significant within- and between-group changes for anthropometric and metabolic variables. The results show that ALA supplementation improves vascular tone and may have a beneficial effect on CV health in overweight/obese youths.
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Affiliation(s)
- Luciana Tromba
- Department of Surgical Sciences, Sapienza University of Rome, 00161 Rome, Italy.
| | | | - Giovanni Carbotta
- Department of Surgical Sciences, Sapienza University of Rome, 00161 Rome, Italy.
| | - Claudio Chiesa
- Institute of Translational Pharmacology, National Research Council, Via del Fosso del Cavaliere, 100, 00133 Rome, Italy.
| | - Lucia Pacifico
- Department of Pediatrics, Sapienza University of Rome, 00161 Rome, Italy.
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15
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Kuszak AJ, Espey MG, Falk MJ, Holmbeck MA, Manfredi G, Shadel GS, Vernon HJ, Zolkipli-Cunningham Z. Nutritional Interventions for Mitochondrial OXPHOS Deficiencies: Mechanisms and Model Systems. ANNUAL REVIEW OF PATHOLOGY 2018; 13:163-191. [PMID: 29099651 PMCID: PMC5911915 DOI: 10.1146/annurev-pathol-020117-043644] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Multisystem metabolic disorders caused by defects in oxidative phosphorylation (OXPHOS) are severe, often lethal, conditions. Inborn errors of OXPHOS function are termed primary mitochondrial disorders (PMDs), and the use of nutritional interventions is routine in their supportive management. However, detailed mechanistic understanding and evidence for efficacy and safety of these interventions are limited. Preclinical cellular and animal model systems are important tools to investigate PMD metabolic mechanisms and therapeutic strategies. This review assesses the mechanistic rationale and experimental evidence for nutritional interventions commonly used in PMDs, including micronutrients, metabolic agents, signaling modifiers, and dietary regulation, while highlighting important knowledge gaps and impediments for randomized controlled trials. Cellular and animal model systems that recapitulate mutations and clinical manifestations of specific PMDs are evaluated for their potential in determining pathological mechanisms, elucidating therapeutic health outcomes, and investigating the value of nutritional interventions for mitochondrial disease conditions.
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Affiliation(s)
- Adam J Kuszak
- Office of Dietary Supplements, National Institutes of Health, Bethesda, Maryland 20852, USA;
| | - Michael Graham Espey
- Division of Cancer Biology, National Cancer Institute, Rockville, Maryland 20850, USA;
| | - Marni J Falk
- Department of Pediatrics, Division of Human Genetics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA;
- Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Marissa A Holmbeck
- Department of Pathology, Yale School of Medicine, New Haven, Connecticut 06510-8023, USA;
| | - Giovanni Manfredi
- Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, New York, NY 10065, USA;
| | - Gerald S Shadel
- Department of Pathology, Yale School of Medicine, New Haven, Connecticut 06510-8023, USA;
- Department of Genetics, Yale School of Medicine, New Haven, Connecticut 06520-8023, USA;
| | - Hilary J Vernon
- McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University, Baltimore, Maryland 21205, USA;
| | - Zarazuela Zolkipli-Cunningham
- Department of Pediatrics, Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA;
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16
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Bou M, Østbye TK, Berge GM, Ruyter B. EPA, DHA, and Lipoic Acid Differentially Modulate the n-3 Fatty Acid Biosynthetic Pathway in Atlantic Salmon Hepatocytes. Lipids 2017; 52:265-283. [PMID: 28132119 DOI: 10.1007/s11745-017-4234-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2016] [Accepted: 01/16/2017] [Indexed: 12/17/2022]
Abstract
The aim of the present study was to investigate how EPA, DHA, and lipoic acid (LA) influence the different metabolic steps in the n-3 fatty acid (FA) biosynthetic pathway in hepatocytes from Atlantic salmon fed four dietary levels (0, 0.5, 1.0 and 2.0%) of EPA, DHA or a 1:1 mixture of these FA. The hepatocytes were incubated with [1-14C] 18:3n-3 in the presence or absence of LA (0.2 mM). Increased endogenous levels of EPA and/or DHA and LA exposure both led to similar responses in cells with reduced desaturation and elongation of [1-14C] 18:3n-3 to 18:4n-3, 20:4n-3, and EPA, in agreement with reduced expression of the Δ6 desaturase gene involved in the first step of conversion. DHA production, on the other hand, was maintained even in groups with high endogenous levels of DHA, possibly due to a more complex regulation of this last step in the n-3 metabolic pathway. Inhibition of the Δ6 desaturase pathway led to increased direct elongation to 20:3n-3 by both DHA and LA. Possibly the route by 20:3n-3 and then Δ8 desaturation to 20:4n-3, bypassing the first Δ6 desaturase step, can partly explain the maintained or even increased levels of DHA production. LA increased DHA production in the phospholipid fraction of hepatocytes isolated from fish fed 0 and 0.5% EPA and/or DHA, indicating that LA has the potential to further increase the production of this health-beneficial FA in fish fed diets with low levels of EPA and/or DHA.
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Affiliation(s)
- Marta Bou
- Nofima (Norwegian Institute of Food, Fisheries and Aquaculture Research), P.O. Box 210, 1431, Ås, Norway. .,Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, Ås, Norway.
| | - Tone-Kari Østbye
- Nofima (Norwegian Institute of Food, Fisheries and Aquaculture Research), P.O. Box 210, 1431, Ås, Norway
| | | | - Bente Ruyter
- Nofima (Norwegian Institute of Food, Fisheries and Aquaculture Research), P.O. Box 210, 1431, Ås, Norway.,Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, Ås, Norway
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17
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Monastra G, De Grazia S, Cilaker Micili S, Goker A, Unfer V. Immunomodulatory activities of alpha lipoic acid with a special focus on its efficacy in preventing miscarriage. Expert Opin Drug Deliv 2016; 13:1695-1708. [DOI: 10.1080/17425247.2016.1200556] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Giovanni Monastra
- Department of Experimental Medicine, University la Sapienza, Rome, Italy
| | - Sara De Grazia
- Department of Research and Development, LO.LI. Pharma, Rome, Italy
| | | | - Asli Goker
- Department of Obstetrics and Gynecology, Celal Bayar University, Manisa, Turkey
| | - Vittorio Unfer
- Department of Medical Sciences, UNIIPUS – Private Swiss University Institute, Chiasso, Switzerland
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18
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Irwin MH, Moos WH, Faller DV, Steliou K, Pinkert CA. Epigenetic Treatment of Neurodegenerative Disorders: Alzheimer and Parkinson Diseases. Drug Dev Res 2016; 77:109-23. [PMID: 26899010 DOI: 10.1002/ddr.21294] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Preclinical Research In this review, we discuss epigenetic-driven methods for treating neurodegenerative disorders associated with mitochondrial dysfunction, focusing on carnitinoid antioxidant-histone deacetylase inhibitors that show an ability to reinvigorate synaptic plasticity and protect against neuromotor decline in vivo. Aging remains a major risk factor in patients who progress to dementia, a clinical syndrome typified by decreased mental capacity, including impairments in memory, language skills, and executive function. Energy metabolism and mitochondrial dysfunction are viewed as determinants in the aging process that may afford therapeutic targets for a host of disease conditions, the brain being primary in such thinking. Mitochondrial dysfunction is a core feature in the pathophysiology of both Alzheimer and Parkinson diseases and rare mitochondrial diseases. The potential of new therapies in this area extends to glaucoma and other ophthalmic disorders, migraine, Creutzfeldt-Jakob disease, post-traumatic stress disorder, systemic exertion intolerance disease, and chemotherapy-induced cognitive impairment. An emerging and hopefully more promising approach to addressing these hard-to-treat diseases leverages their sensitivity to activation of master regulators of antioxidant and cytoprotective genes, antioxidant response elements, and mitophagy. Drug Dev Res 77 : 109-123, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Michael H Irwin
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA
| | - Walter H Moos
- Department of Pharmaceutical Chemistry, School of Pharmacy, University of California San Francisco, San Francisco, CA, USA.,SRI Biosciences, A Division of SRI International, Menlo Park, CA, USA
| | - Douglas V Faller
- Cancer Research Center, Boston University School of Medicine, Boston, MA, USA
| | - Kosta Steliou
- Cancer Research Center, Boston University School of Medicine, Boston, MA, USA.,PhenoMatriX, Inc., Boston, MA, USA
| | - Carl A Pinkert
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA.,Department of Biological Sciences, College of Arts and Sciences, The University of Alabama, Tuscaloosa, AL, USA
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19
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Moos WH, Faller DV, Harpp DN, Kanara I, Pernokas J, Powers WR, Steliou K. Microbiota and Neurological Disorders: A Gut Feeling. Biores Open Access 2016; 5:137-45. [PMID: 27274912 PMCID: PMC4892191 DOI: 10.1089/biores.2016.0010] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
In the past century, noncommunicable diseases have surpassed infectious diseases as the principal cause of sickness and death, worldwide. Trillions of commensal microbes live in and on our body, and constitute the human microbiome. The vast majority of these microorganisms are maternally derived and live in the gut, where they perform functions essential to our health and survival, including: digesting food, activating certain drugs, producing short-chain fatty acids (which help to modulate gene expression by inhibiting the deacetylation of histone proteins), generating anti-inflammatory substances, and playing a fundamental role in the induction, training, and function of our immune system. Among the many roles the microbiome ultimately plays, it mitigates against untoward effects from our exposure to the environment by forming a biotic shield between us and the outside world. The importance of physical activity coupled with a balanced and healthy diet in the maintenance of our well-being has been recognized since antiquity. However, it is only recently that characterization of the host-microbiome intermetabolic and crosstalk pathways has come to the forefront in studying therapeutic design. As reviewed in this report, synthetic biology shows potential in developing microorganisms for correcting pathogenic dysbiosis (gut microbiota-host maladaptation), although this has yet to be proven. However, the development and use of small molecule drugs have a long and successful history in the clinic, with small molecule histone deacetylase inhibitors representing one relevant example already approved to treat cancer and other disorders. Moreover, preclinical research suggests that epigenetic treatment of neurological conditions holds significant promise. With the mouth being an extension of the digestive tract, it presents a readily accessible diagnostic site for the early detection of potential unhealthy pathogens resident in the gut. Taken together, the data outlined herein provide an encouraging roadmap toward important new medicines and companion diagnostic platforms in a wide range of therapeutic indications.
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Affiliation(s)
- Walter H. Moos
- Department of Pharmaceutical Chemistry, School of Pharmacy, University of California San Francisco, San Francisco, California
- Address correspondence to: Walter H. Moos, PhD, Department of Pharmaceutical Chemistry, School of Pharmacy, University of California San Francisco, 600 16th Street, Mail Code 2280, Genentech Hall S512D, Mission Bay Campus, San Francisco, CA 94158, E-mail: , ; or Kosta Steliou, PhD, PhenoMatriX, Inc., 9 Hawthorne Place Suite 4R, Boston, MA 02114, E-mail: ,
| | - Douglas V. Faller
- Department of Medicine, Boston University School of Medicine, Boston, Massachusetts
- Cancer Research Center, Boston University School of Medicine, Boston, Massachusetts
| | - David N. Harpp
- Department of Chemistry, McGill University, Montreal, Canada
| | - Iphigenia Kanara
- Weatherhead Center for International Affairs, Harvard University, Cambridge, Massachusetts
- Consulate General of Greece in Boston, Boston, Massachusetts
| | - Julie Pernokas
- Advanced Dental Associates of New England, Woburn, Massachusetts
| | - Whitney R. Powers
- Department of Health Sciences, Boston University, Boston, Massachusetts
- Department of Anatomy, Boston University School of Medicine, Boston, Massachusetts
| | - Kosta Steliou
- Cancer Research Center, Boston University School of Medicine, Boston, Massachusetts
- PhenoMatriX, Inc., Boston, Massachusetts
- Address correspondence to: Walter H. Moos, PhD, Department of Pharmaceutical Chemistry, School of Pharmacy, University of California San Francisco, 600 16th Street, Mail Code 2280, Genentech Hall S512D, Mission Bay Campus, San Francisco, CA 94158, E-mail: , ; or Kosta Steliou, PhD, PhenoMatriX, Inc., 9 Hawthorne Place Suite 4R, Boston, MA 02114, E-mail: ,
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