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Arora B, Lather V, Pathalingappa MB, Walia R. Enhancement of aqueous solubility of hesperidin and naringenin utilizing hydrotropic solubilization technique: characterization and in vitro evaluation. JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 2024; 26:1207-1218. [PMID: 38945159 DOI: 10.1080/10286020.2024.2358831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2024] [Revised: 05/14/2024] [Accepted: 05/14/2024] [Indexed: 07/02/2024]
Abstract
The therapeutic potential of two important flavonoids, i.e. hesperidin and naringenin, remains unutilized due to pharmacokinetics issues, especially poor aqueous solubility. Hydrotropic solid dispersions with different agents like sodium salicylate, niacinamide, benzoic acid, and urea etc. can change the solubility profile of poorly soluble drugs. The current study investigated the potential of different hydrotropic agents in improving the solubility of both natural bioactives. The hydrotropic solid dispersion in 1:3 w/w drug: sodium salicylate ratio showed maximum solubility and dissolution amongst all the tested hydrotropes. This novel and economical approach could be explored for other poorly soluble pharmaceuticals.
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Affiliation(s)
- Bhawna Arora
- Amity Institute of Pharmacy, Amity University Uttar Pradesh, Sector-125, Noida, 201313, India
| | - Viney Lather
- Amity Institute of Pharmacy, Amity University Uttar Pradesh, Sector-125, Noida, 201313, India
| | | | - Ramanpreet Walia
- Amity Institute of Pharmacy, Amity University Uttar Pradesh, Sector-125, Noida, 201313, India
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2
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de Oliveira Pereira FS, Santos AG, Neto JSS, Silva GMM, Pinton S, Zeni GR, Nogueira CW, Ávila DS, Quines CB. (p-ClPhSe) 2 modulation on carbohydrate and lipid metabolism requires the insulin-like signaling in Caenorhabditis elegans. Biochem Biophys Res Commun 2024; 696:149514. [PMID: 38237233 DOI: 10.1016/j.bbrc.2024.149514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 01/05/2024] [Accepted: 01/09/2024] [Indexed: 02/02/2024]
Abstract
Organoselenium compounds modulate the metabolism by regulating carbohydrate and lipid syntheses and degradation in the liver, muscle, and adipose tissue. Notably, p-chloro-diphenyl diselenide (p-ClPhSe)2 can directly regulate the activities of enzymes involved in glucose metabolism, suggesting an insulin-like effect in rodents; however, there is still a lack of scientific evidence to confirm this hypothesis. The objective of this study was to investigate (p-ClPhSe)2 effects on glucose and lipid metabolism in Caenorhabditis elegans. The contribution of AGE-1/PI3K, AKT-1, AKT-2, PFK-1, DAF-16, and DAF-2 in the (p-ClPhSe)2 effects were also investigated. Our results demonstrate that (p-ClPhSe)2 acute exposure presented some toxicity to the worms, and therefore, lower concentrations were further used. (p-ClPhSe)2 reduced glucose and triglyceride levels to the baseline levels, after induction with glucose or fructose, in wild-type worms. This effect required proteins involved in the insulin/IGF-1 like signaling, such as the DAF-2, AGE-1, AKT-1 and AKT-2, PFK-1, but also DAF-16, which would be negatively regulated by DAF-2 activation. Moreover, the reduction in glucose and triglyceride levels, caused by (p-ClPhSe)2per se was lost in age-1/daf-16 worms, suggesting that insulin/IGF-1-like signaling in a DAF-2 and AGE-1/DAF-16 dependent-manner in C. elegans are necessary to effects of (p-ClPhSe)2. In conclusion, (p-ClPhSe)2 requires proteins involved in the IIS pathway to modulate carbohydrate and lipid metabolism.
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Affiliation(s)
| | | | - José S S Neto
- Chemistry Institute, Federal University of Goiás, Goiânia, GO, Brazil.
| | | | - Simone Pinton
- Federal University of Pampa, Uruguaiana, RS, Brazil.
| | - Gilson R Zeni
- Federal University of Santa Maria, Santa Maria, RS, Brazil.
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Sabry MO, Sedeek MS, El-Sonbaty SM, Issa MY, El Zalabani SM. Regulating microsomal triglyceride transfer protein with natural products for the treatment of hyperlipidaemia. Nat Prod Res 2024:1-5. [PMID: 38178602 DOI: 10.1080/14786419.2023.2300031] [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: 10/24/2023] [Accepted: 12/20/2023] [Indexed: 01/06/2024]
Abstract
Hyperlipidaemia, characterised by elevated levels of lipids, particularly LDL-C, is a significant risk factor for atherosclerotic cardiovascular disease. While synthetic inhibitors of microsomal triglyceride transfer protein (MTP) have shown potential in lowering LDL-C, they are associated with adverse effects. This study explores a novel approach by screening natural products to identify plant extracts that down-regulate MTP gene expression, aiming to reduce hyperlipidaemia with fewer side effects. Modulating MTP expression, rather than direct inhibition, offers a promising avenue for lowering plasma lipids and mitigating cardiovascular risk. Various plant extracts were examined for their potential as MTP down-regulators, with Liquorice root and Pomegranate rind extracts demonstrating the highest efficacy. Additionally, the study assessed the total phenolic content of these extracts, revealing their -antioxidant capacity. This research provides a foundation for further investigation into bioactive molecules as potential anti-hyperlipidemic agents with improved safety profiles, addressing a critical need in cardiovascular disease prevention.
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Affiliation(s)
- Miral O Sabry
- Pharmacognosy Department, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Mohamed S Sedeek
- Pharmacognosy Department, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Sawsan M El-Sonbaty
- Department of Radiation Microbiology, the National Center for Radiation Research and Technology (NCRRT), Atomic Energy Authority, Nasr City, Egypt
| | - Marwa Y Issa
- Pharmacognosy Department, Faculty of Pharmacy, Cairo University, Cairo, Egypt
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Rosa FT, de Souza Fatel EC, Alfieri DF, Flauzino T, Scavuzzi BM, Lozovoy MAB, Iriyoda TMV, Simão ANC, Dichi I. Cranberry juice decreases oxidative stress and improves glucose metabolism in patients with rheumatoid arthritis supplemented with fish oil. PHARMANUTRITION 2023. [DOI: 10.1016/j.phanu.2023.100341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
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Ağagündüz D, Icer MA, Yesildemir O, Koçak T, Kocyigit E, Capasso R. The roles of dietary lipids and lipidomics in gut-brain axis in type 2 diabetes mellitus. J Transl Med 2023; 21:240. [PMID: 37009872 PMCID: PMC10068184 DOI: 10.1186/s12967-023-04088-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Accepted: 03/25/2023] [Indexed: 04/04/2023] Open
Abstract
Type 2 diabetes mellitus (T2DM), one of the main types of Noncommunicable diseases (NCDs), is a systemic inflammatory disease characterized by dysfunctional pancreatic β-cells and/or peripheral insulin resistance, resulting in impaired glucose and lipid metabolism. Genetic, metabolic, multiple lifestyle, and sociodemographic factors are known as related to high T2DM risk. Dietary lipids and lipid metabolism are significant metabolic modulators in T2DM and T2DM-related complications. Besides, accumulated evidence suggests that altered gut microbiota which plays an important role in the metabolic health of the host contributes significantly to T2DM involving impaired or improved glucose and lipid metabolism. At this point, dietary lipids may affect host physiology and health via interaction with the gut microbiota. Besides, increasing evidence in the literature suggests that lipidomics as novel parameters detected with holistic analytical techniques have important roles in the pathogenesis and progression of T2DM, through various mechanisms of action including gut-brain axis modulation. A better understanding of the roles of some nutrients and lipidomics in T2DM through gut microbiota interactions will help develop new strategies for the prevention and treatment of T2DM. However, this issue has not yet been entirely discussed in the literature. The present review provides up-to-date knowledge on the roles of dietary lipids and lipidomics in gut-brain axis in T2DM and some nutritional strategies in T2DM considering lipids- lipidomics and gut microbiota interactions are given.
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Affiliation(s)
- Duygu Ağagündüz
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Gazi University, 06490, Ankara, Turkey.
| | - Mehmet Arif Icer
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Amasya University, 05100, Amasya, Turkey
| | - Ozge Yesildemir
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Bursa Uludag University, 16059, Bursa, Turkey
| | - Tevfik Koçak
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Gazi University, 06490, Ankara, Turkey
| | - Emine Kocyigit
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Ordu University, 52200, Ordu, Turkey
| | - Raffaele Capasso
- Department of Agricultural Sciences, University of Naples Federico II, Portici, 80055, Naples, Italy.
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Qiu M, Wei W, Zhang J, Wang H, Bai Y, Guo DA. A Scientometric Study to a Critical Review on Promising Anticancer and Neuroprotective Compounds: Citrus Flavonoids. Antioxidants (Basel) 2023; 12:antiox12030669. [PMID: 36978916 PMCID: PMC10045114 DOI: 10.3390/antiox12030669] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 02/20/2023] [Accepted: 02/23/2023] [Indexed: 03/12/2023] Open
Abstract
Flavonoids derived from citrus plants are favored by phytomedicinal researchers due to their wide range of biological activities, and relevant studies have been sustained for 67 years (since the first paper published in 1955). In terms of a scientometric and critical review, the scientometrics of related papers, chemical structures, and pharmacological action of citrus flavonoids were comprehensively summarized. The modern pharmacological effects of citrus flavonoids are primarily focused on their anticancer activities (such as breast cancer, gastric cancer, lung cancer, and liver cancer), neuroprotective effects (such as anti-Alzheimer’s disease, Parkinson’s disease), and metabolic diseases. Furthermore, the therapeutic mechanism of cancers (including inducing apoptosis, inhibiting cell proliferation, and inhibiting cancer metastasis), neuroprotective effects (including antioxidant and anti-inflammatory), and metabolic diseases (such as non-alcoholic fatty liver disease, type 2 diabetes mellitus) were summarized and discussed. We anticipate that this review could provide an essential reference for anti-cancer and neuroprotective research of citrus flavonoids and provide researchers with a comprehensive understanding of citrus flavonoids.
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Affiliation(s)
- Mingyang Qiu
- College of Pharmacy, Changchun University of Chinese Medicine, Changchun 130117, China
- Shanghai Research Center for Modernization of Traditional Chinese Medicine, National Engineering Research Center of TCM Standardization Technology, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Wenlong Wei
- Shanghai Research Center for Modernization of Traditional Chinese Medicine, National Engineering Research Center of TCM Standardization Technology, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Jianqing Zhang
- Shanghai Research Center for Modernization of Traditional Chinese Medicine, National Engineering Research Center of TCM Standardization Technology, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Hanze Wang
- College of Pharmacy, Changchun University of Chinese Medicine, Changchun 130117, China
- Shanghai Research Center for Modernization of Traditional Chinese Medicine, National Engineering Research Center of TCM Standardization Technology, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Yuxin Bai
- College of Pharmacy, Changchun University of Chinese Medicine, Changchun 130117, China
- Shanghai Research Center for Modernization of Traditional Chinese Medicine, National Engineering Research Center of TCM Standardization Technology, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - De-an Guo
- College of Pharmacy, Changchun University of Chinese Medicine, Changchun 130117, China
- Shanghai Research Center for Modernization of Traditional Chinese Medicine, National Engineering Research Center of TCM Standardization Technology, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
- Correspondence:
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Sharma A, Bhardwaj P, Arya SK. Naringin: A potential natural product in the field of biomedical applications. CARBOHYDRATE POLYMER TECHNOLOGIES AND APPLICATIONS 2021. [DOI: 10.1016/j.carpta.2021.100068] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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Visvanathan R, Williamson G. Citrus polyphenols and risk of type 2 diabetes: Evidence from mechanistic studies. Crit Rev Food Sci Nutr 2021; 63:2178-2202. [PMID: 34496701 DOI: 10.1080/10408398.2021.1971945] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Citrus fruits are a rich source of (poly)phenols, a group of dietary bioactive compounds that protect against developing type 2 diabetes. Our review critically evaluates how experimental in vitro and animal models have elucidated some of the underlying mechanisms on how citrus (poly)phenols affect the markers of type 2 diabetes. According to animal studies, the beneficial effects derived from consuming citrus compounds appear to be related to long-term effects, rather than acute. There are some notable effects from citrus (poly)phenol metabolites on post-absorptive processes, such as modulation of hepatic glucose metabolism and insulin sensitivity in target tissues, but with a more modest effect on digestion and sugar absorption within the gut. Experimental studies on cells and other systems in vitro have indicated some of the possible mechanisms involved, but ∼70% of the studies utilized unrealistically high concentrations and forms of the compounds, compromising physiological relevance. Future studies should discuss the relevance of concentration used in in vitro experiments, relative to the proposed site of action, and also examine the role of catabolites produced by the gut microbiota. Finally, it is important to examine the relationship between the gut microbiota and bioavailability on the action of citrus (poly)phenols.
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Affiliation(s)
- Rizliya Visvanathan
- Department of Nutrition, Dietetics, and Food, School of Clinical Sciences at Monash Health, Faculty of Medicine, Nursing and Health Sciences, Monash University, BASE Facility, Notting Hill, VIC, Australia
| | - Gary Williamson
- Department of Nutrition, Dietetics, and Food, School of Clinical Sciences at Monash Health, Faculty of Medicine, Nursing and Health Sciences, Monash University, BASE Facility, Notting Hill, VIC, Australia
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Heeren J, Scheja L. Metabolic-associated fatty liver disease and lipoprotein metabolism. Mol Metab 2021; 50:101238. [PMID: 33892169 PMCID: PMC8324684 DOI: 10.1016/j.molmet.2021.101238] [Citation(s) in RCA: 210] [Impact Index Per Article: 70.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 04/01/2021] [Accepted: 04/15/2021] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Non-alcoholic fatty liver disease, or as recently proposed 'metabolic-associated fatty liver disease' (MAFLD), is characterized by pathological accumulation of triglycerides and other lipids in hepatocytes. This common disease can progress from simple steatosis to steatohepatitis, and eventually end-stage liver diseases. MAFLD is closely related to disturbances in systemic energy metabolism, including insulin resistance and atherogenic dyslipidemia. SCOPE OF REVIEW The liver is the central organ in lipid metabolism by secreting very low density lipoproteins (VLDL) and, on the other hand, by internalizing fatty acids and lipoproteins. This review article discusses recent research addressing hepatic lipid synthesis, VLDL production, and lipoprotein internalization as well as the lipid exchange between adipose tissue and the liver in the context of MAFLD. MAJOR CONCLUSIONS Liver steatosis in MAFLD is triggered by excessive hepatic triglyceride synthesis utilizing fatty acids derived from white adipose tissue (WAT), de novo lipogenesis (DNL) and endocytosed remnants of triglyceride-rich lipoproteins. In consequence of high hepatic lipid content, VLDL secretion is enhanced, which is the primary cause of complex dyslipidemia typical for subjects with MAFLD. Interventions reducing VLDL secretory capacity attenuate dyslipidemia while they exacerbate MAFLD, indicating that the balance of lipid storage versus secretion in hepatocytes is a critical parameter determining disease outcome. Proof of concept studies have shown that promoting lipid storage and energy combustion in adipose tissues reduces hepatic lipid load and thus ameliorates MAFLD. Moreover, hepatocellular triglyceride synthesis from DNL and WAT-derived fatty acids can be targeted to treat MAFLD. However, more research is needed to understand how individual transporters, enzymes, and their isoforms affect steatosis and dyslipidemia in vivo, and whether these two aspects of MAFLD can be selectively treated. Processing of cholesterol-enriched lipoproteins appears less important for steatosis. It may, however, modulate inflammation and consequently MAFLD progression.
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Affiliation(s)
- Joerg Heeren
- Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
| | - Ludger Scheja
- Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
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Non-alcoholic fatty liver disease: a metabolic burden promoting atherosclerosis. Clin Sci (Lond) 2021; 134:1775-1799. [PMID: 32677680 DOI: 10.1042/cs20200446] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 06/06/2020] [Accepted: 06/29/2020] [Indexed: 02/07/2023]
Abstract
Non-alcoholic fatty liver disease (NAFLD) has become the fastest growing chronic liver disease, with a prevalence of up to 25% worldwide. Individuals with NAFLD have a high risk of disease progression to cirrhosis, hepatocellular carcinoma (HCC), and liver failure. With the exception of intrahepatic burden, cardiovascular disease (CVD) and especially atherosclerosis (AS) are common complications of NAFLD. Furthermore, CVD is a major cause of death in NAFLD patients. Additionally, AS is a metabolic disorder highly associated with NAFLD, and individual NAFLD pathologies can greatly increase the risk of AS. It is increasingly clear that AS-associated endothelial cell damage, inflammatory cell activation, and smooth muscle cell proliferation are extensively impacted by NAFLD-induced systematic dyslipidemia, inflammation, oxidative stress, the production of hepatokines, and coagulations. In clinical trials, drug candidates for NAFLD management have displayed promising effects for the treatment of AS. In this review, we summarize the key molecular events and cellular factors contributing to the metabolic burden induced by NAFLD on AS, and discuss therapeutic strategies for the improvement of AS in individuals with NAFLD.
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Jha DK, Shah DS, Talele SR, Amin PD. Correlation of two validated methods for the quantification of naringenin in its solid dispersion: HPLC and UV spectrophotometric methods. SN APPLIED SCIENCES 2020. [DOI: 10.1007/s42452-020-2536-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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12
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Iqbal J, Jahangir Z, Al-Qarni AA. Microsomal Triglyceride Transfer Protein: From Lipid Metabolism to Metabolic Diseases. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1276:37-52. [DOI: 10.1007/978-981-15-6082-8_4] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Burke AC, Sutherland BG, Telford DE, Morrow MR, Sawyez CG, Edwards JY, Huff MW. Naringenin enhances the regression of atherosclerosis induced by a chow diet in Ldlr -/- mice. Atherosclerosis 2019; 286:60-70. [PMID: 31102954 DOI: 10.1016/j.atherosclerosis.2019.05.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2019] [Revised: 03/31/2019] [Accepted: 05/08/2019] [Indexed: 12/27/2022]
Abstract
BACKGROUND AND AIMS Naringenin is a citrus-derived flavonoid with lipid-lowering and insulin-sensitizing effects leading to athero-protection in Ldlr-/- mice fed a high-fat diet. However, the ability of naringenin to promote atherosclerosis regression is unknown. In the present study, we assessed the capacity of naringenin to enhance regression in Ldlr-/- mice with diet-induced intermediate atherosclerosis intervened with a chow diet. METHODS Male Ldlr-/- mice were fed a high-fat, cholesterol-containing (HFHC) diet for 12 weeks to induce intermediate atherosclerosis and metabolic dysfunction. Subsequently, a group of these mice were sacrificed for baseline analyses and the remainder either 1) continued on the HFHC diet, 2) switched to a chow diet or 3) switched to chow diet supplemented with naringenin. RESULTS After 12 weeks induction, intermediate lesions developed in the aortic sinus. Intervention with chow alone slowed lesion growth, while intervention with naringenin-supplemented chow completely halted lesion growth. Lesions were characterized by features of improved morphology. Compared to chow alone, naringenin reduced plaque macrophages and modestly increased smooth muscle cells. Investigating processes that contributed to improved plaque morphology, we showed naringenin further reduced plasma triglycerides and cholesterol compared to chow alone. Furthermore, elevated monocytosis and myelopoiesis were further corrected by intervention with naringenin compared to chow alone. Metabolically, naringenin enhanced the correction of insulin resistance, hepatic steatosis and obesity compared to chow alone, potentially contributing to enhanced regression. CONCLUSIONS Naringenin supplementation to chow enhances atherosclerosis regression in male Ldlr-/- mice. These studies further underscore the potential therapeutic utility of naringenin.
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Affiliation(s)
- Amy C Burke
- Molecular Medicine, Robarts Research Institute, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada; Department of Biochemistry, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada
| | - Brian G Sutherland
- Molecular Medicine, Robarts Research Institute, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada
| | - Dawn E Telford
- Molecular Medicine, Robarts Research Institute, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada; Department of Medicine, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada
| | - Marisa R Morrow
- Molecular Medicine, Robarts Research Institute, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada
| | - Cynthia G Sawyez
- Molecular Medicine, Robarts Research Institute, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada; Department of Medicine, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada
| | - Jane Y Edwards
- Molecular Medicine, Robarts Research Institute, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada; Department of Medicine, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada
| | - Murray W Huff
- Molecular Medicine, Robarts Research Institute, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada; Department of Biochemistry, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada; Department of Medicine, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada.
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Burke AC, Telford DE, Edwards JY, Sutherland BG, Sawyez CG, Huff MW. Naringenin Supplementation to a Chow Diet Enhances Energy Expenditure and Fatty Acid Oxidation, and Reduces Adiposity in Lean, Pair-Fed Ldlr -/- Mice. Mol Nutr Food Res 2019; 63:e1800833. [PMID: 30578663 DOI: 10.1002/mnfr.201800833] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Revised: 11/12/2018] [Indexed: 12/14/2022]
Abstract
SCOPE Naringenin is a citrus-derived flavonoid that has potent lipid-lowering and insulin-sensitizing effects in obese mouse models of metabolic dysfunction. However, in these models, a significant effect of naringenin supplementation is the prevention of weight gain, which in itself can confer metabolic protection. Therefore, in the present study, the effect of naringenin supplementation in lean, chow-fed Ldlr-/- mice is investigated. METHODS AND RESULTS In Ldlr-/- mice with isocaloric food consumption, treatment with naringenin for 8 weeks reduces body weight and adiposity compared to littermate controls pair-fed the chow diet alone. Furthermore, naringenin treatment reduces plasma lipids and enhances insulin sensitivity compared to chow-fed controls. Metabolic cage studies reveal that naringenin-treated mice have elevated energy expenditure with no change in ambulatory activity. Additionally, naringenin-treated mice have an increased respiratory exchange ratio and food consumption during the dark cycle. Treatment increases the expression of fatty acid oxidation genes in liver, and increased β-hydroxybutyrate concentrations in plasma, indicating that one mechanism through which naringenin mediates metabolic improvement is enhanced hepatic fatty acid oxidation. CONCLUSIONS These studies highlight the potential therapeutic utility of naringenin and suggest that this flavonoid maintains potent metabolic properties in the absence of obesity or a high-fat diet.
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Affiliation(s)
- Amy C Burke
- Molecular Medicine, Robarts Research Institute, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada.,Department of Biochemistry, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada
| | - Dawn E Telford
- Molecular Medicine, Robarts Research Institute, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada.,Department of Medicine, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada
| | - Jane Y Edwards
- Molecular Medicine, Robarts Research Institute, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada.,Department of Medicine, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada
| | - Brian G Sutherland
- Molecular Medicine, Robarts Research Institute, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada
| | - Cynthia G Sawyez
- Molecular Medicine, Robarts Research Institute, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada.,Department of Medicine, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada
| | - Murray W Huff
- Molecular Medicine, Robarts Research Institute, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada.,Department of Biochemistry, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada.,Department of Medicine, The University of Western Ontario, 1151 Richmond St N., London, Ontario, N6A 5B7, Canada
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Oyetayo FL, Akomolafe SF, Oladapo IF. A comparative study on the estimated glycemic index (eGI), phenolic constituents, antioxidative and potential antihyperglycemic effects of different parts of ripe Citrus paradisi fruit. ACTA ACUST UNITED AC 2018. [DOI: 10.1007/s13596-018-0355-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
Accumulating clinical evidence has suggested serum triglyceride (TG) is a leading predictor of atherosclerotic cardiovascular disease, comparable to low-density lipoprotein (LDL)-cholesterol (C) in populations with type 2 diabetes, which exceeds the predictive power of hemoglobinA1c. Atherogenic dyslipidemia in diabetes consists of elevated serum concentrations of TG-rich lipoproteins (TRLs), a high prevalence of small dense low-density lipoprotein (LDL), and low concentrations of cholesterol-rich high-density lipoprotein (HDL)2-C. A central lipoprotein abnormality is an increase in large TG-rich very-low-density lipoprotein (VLDL)1, and other lipoprotein abnormalities are metabolically linked to increased TRLs. Insulin critically regulates serum VLDL concentrations by suppressing hepatic VLDL production and stimulating VLDL removal by activation of lipoprotein lipase. It is still debated whether hyperinsulinemia compensatory for insulin resistance is causally associated with the overproduction of VLDL. This review introduces experimental and clinical observations revealing that insulin resistance, but not hyperinsulinemia stimulates hepatic VLDL production. LDL and HDL consist of heterogeneous particles with different size and density. Cholesterol-depleted small dense LDL and cholesterol-rich HDL2 subspecies are particularly affected by insulin resistance and can be named “Metabolic LDL and HDL,” respectively. We established the direct assays for quantifying small dense LDL-C and small dense HDL(HDL3)-C, respectively. Subtracting HDL3-C from HDL-C gives HDL2-C. I will explain clinical relevance of measurements of LDL and HDL subspecies determined by our assays. Diabetic kidney disease (DKD) substantially worsens plasma lipid profile thereby potentiated atherogenic risk. Finally, I briefly overview pathophysiology of dyslipidemia associated with DKD, which has not been so much taken up by other review articles.
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Affiliation(s)
- Tsutomu Hirano
- Department of Medicine, Division of Diabetes, Metabolism, and Endocrinology, Showa University School of Medicine
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Jardim ACG, Shimizu JF, Rahal P, Harris M. Plant-derived antivirals against hepatitis c virus infection. Virol J 2018; 15:34. [PMID: 29439720 PMCID: PMC5812025 DOI: 10.1186/s12985-018-0945-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 02/02/2018] [Indexed: 12/15/2022] Open
Abstract
Hepatitis C virus (HCV) infection is a worldwide public health burden and it is estimated that 185 million people are or have previously been infected worldwide. There is no effective vaccine for prevention of HCV infection; however, a number of drugs are available for the treatment of infection. The availability of direct-acting antivirals (DAAs) has dramatically improved therapeutic options for HCV genotype 1. However, the high costs and potential for development of resistance presented by existing treatment demonstrate the need for the development of more efficient new antivirals, or combination of therapies that target different stages of the viral lifecycle. Over the past decades, there has been substantial study of compounds extracted from plants that have activity against a range of microorganisms that cause human diseases. An extensive variety of natural compounds has demonstrated antiviral action worldwide, including anti-HCV activity. In this context, plant-derived compounds can provide an alternative approach to new antivirals. In this review, we aim to summarize the most promising plant-derived compounds described to have antiviral activity against HCV.
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Affiliation(s)
- Ana Carolina Gomes Jardim
- Laboratory of Virology, Institute of Biomedical Science, ICBIM, Federal University of Uberlândia, Avenida Amazonas, Bloco 4C – sala 216. Umuarama, Uberlândia, MG CEP: 38405-302 Brazil
- Genomics Study Laboratory, São Paulo State University, São José do Rio Preto, SP Brazil
| | - Jacqueline Farinha Shimizu
- Laboratory of Virology, Institute of Biomedical Science, ICBIM, Federal University of Uberlândia, Avenida Amazonas, Bloco 4C – sala 216. Umuarama, Uberlândia, MG CEP: 38405-302 Brazil
- Genomics Study Laboratory, São Paulo State University, São José do Rio Preto, SP Brazil
| | - Paula Rahal
- Genomics Study Laboratory, São Paulo State University, São José do Rio Preto, SP Brazil
| | - Mark Harris
- School of Molecular and Cellular Biology, Faculty of Biological Sciences and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, LS2 9JT UK
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Jin L, Zeng W, Zhang F, Zhang C, Liang W. Naringenin Ameliorates Acute Inflammation by Regulating Intracellular Cytokine Degradation. THE JOURNAL OF IMMUNOLOGY 2017; 199:3466-3477. [DOI: 10.4049/jimmunol.1602016] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Accepted: 09/19/2017] [Indexed: 01/08/2023]
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Niu C, Luo Z, Yu L, Yang Y, Chen Y, Luo X, Lai F, Song Y. Associations of the APOB rs693 and rs17240441 polymorphisms with plasma APOB and lipid levels: a meta-analysis. Lipids Health Dis 2017; 16:166. [PMID: 28874158 PMCID: PMC5586014 DOI: 10.1186/s12944-017-0558-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Accepted: 08/31/2017] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND The associations of the apolipoprotein B gene (APOB) rs693 and rs17240441 polymorphisms with plasma levels of APOB and lipids have been widely explored, but the results were inconclusive. This meta-analysis aimed to clarify the associations of the rs693 and rs17240441 polymorphisms with fasting APOB and lipid levels. METHODS Sixty-one studies (50,018 subjects) and 23 studies (8425 subjects) were respectively identified for the rs693 and rs17240441 polymorphisms by searching in PubMed, Google Scholar, Web of Science, Cochrane Library, Wanfang, VIP and CNKI databases. The following information was collected for each study: first author, age, gender, ethnicity, health condition, sample size, genotyping, lipid assay method, mean and standard deviation or standard error of APOB and lipid variables by genotypes. A dominant model was used for this meta-analysis. RESULTS The carriers of the rs693 variant allele (T) had higher levels of APOB [standardized mean difference (SMD) = 0.26, 95% confidence interval (CI) = 0.16-0.36, P < 0.01], triglycerides (TG) (SMD = 0.12, 95% CI = 0.05-0.20, P < 0.01), total cholesterol (TC) (SMD = 0.24, 95% CI = 0.17-0.30, P < 0.01) and low-density lipoprotein cholesterol (LDL-C) (SMD = 0.22, 95% CI = 0.14-0.30, P < 0.01), and lower levels of high-density lipoprotein cholesterol (HDL-C) (SMD = -0.06, 95% CI = -0.11-0.01, P = 0.01) than the non-carriers. The carriers of the rs17240441 deletion allele had higher levels of APOB (SMD = 0.13, 95% CI = 0.06-0.20, P < 0.01), TC (SMD = 0.17, 95% CI = 0.07-0.26, P < 0.01) and LDL-C (SMD = 0.15, 95% CI = 0.07-0.23, P < 0.01) than the non-carriers. CONCLUSIONS The rs693 polymorphism is significantly associated with higher levels of APOB, TG, TC and LDL-C, and lower levels of HDL-C. The rs17240441 polymorphism is significantly associated with higher levels of APOB, TC and LDL-C. Further studies are needed to elucidate the underlying mechanisms.
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Affiliation(s)
- Caiqin Niu
- Department of Traditional Chinese Medicine, Affiliated Hospital of North Sichuan Medical College, Nanchong, 637000, People's Republic of China
| | - Zhi Luo
- Department of Cardiology, Affiliated Hospital of North Sichuan Medical College, Nanchong, 637000, People's Republic of China
| | - Liuqin Yu
- Institute of Materia Medica, School of Pharmacy, North Sichuan Medical College, Nanchong, 637000, People's Republic of China
| | - Yang Yang
- School of Clinical Medicine, North Sichuan Medical College, Nanchong, 637000, People's Republic of China
| | - Yun Chen
- Department of Cardiology, Affiliated Hospital of North Sichuan Medical College, Nanchong, 637000, People's Republic of China
| | - Xin Luo
- School of Clinical Medicine, North Sichuan Medical College, Nanchong, 637000, People's Republic of China
| | - Feiya Lai
- School of Clinical Medicine, North Sichuan Medical College, Nanchong, 637000, People's Republic of China
| | - Yongyan Song
- Department of Medical Biochemistry, School of Preclinical Medicine, North Sichuan Medical College, Nanchong, 637000, People's Republic of China.
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Hypolipidaemic function of Hsian-tsao tea ( Mesona procumbens Hemsl.): Working mechanisms and active components. J Funct Foods 2016. [DOI: 10.1016/j.jff.2016.07.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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21
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Roy S, Ahmed F, Banerjee S, Saha U. Naringenin ameliorates streptozotocin-induced diabetic rat renal impairment by downregulation of TGF-β1 and IL-1 via modulation of oxidative stress correlates with decreased apoptotic events. PHARMACEUTICAL BIOLOGY 2016; 54:1616-1627. [PMID: 26928632 DOI: 10.3109/13880209.2015.1110599] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2014] [Revised: 04/04/2015] [Accepted: 10/15/2015] [Indexed: 06/05/2023]
Abstract
CONTEXT Naringenin, a flavonone and a nutritive antioxidant which is mostly obtained from grapefruit, orange or tomato skin, has been extensively studied due to its radical scavenging activity. OBJECTIVE The present study investigates the protective effect of naringenin on rat kidney after streptozotocin-induced diabetes. MATERIALS AND METHODS Sixty male Wistar rats were divided into six groups. Diabetes was induced by a single intraperitoneal injection of streptozotocin (50 mg/kg) in groups II, III and IV. Naringenin 5 mg/kg body weight was given to groups III and V, but 10 mg/kg was given to groups IV and VI, orally once a day for 10 weeks. After which all animals were sacrificed, and the biochemical, histopathological, immunohistochemical and apoptotic assays were conducted. RESULTS Naringenin treatment with 5 and 10 mg/kg significantly decreased (p < 0.05) the serum biochemical parameters, elevated tissue malondialdehyde levels and increased (p < 0.01) the reduced superoxide dismutase, catalase and reduced glutathione enzyme activities in the diabetic kidney. Diabetes-induced naringenin-treated groups showed an improved histology and revealed a significant reduction in apoptosis activity (7.2 ± 0.01 and 1.8 ± 0.05) and in expression of TGF-β1 (18.9 ± 3.4 and 10.2 ± 2.1) at a dose of 5 and 10 mg/kg, respectively. Similarly, in contrast to the diabetic group, a significant difference was observed in the IL-1 expression (15.68 ± 4.3) in 5 mg/kg and (9.85 ± 2.1) in 10 mg/kg naringenin-treated groups. CONCLUSION Naringenin acts as a protective agent in diabetic renal impairment by altering oxidative stress, modulation of cytokines expression and apoptotic events.
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Affiliation(s)
- Souvik Roy
- a Department of Pharmaceutical Technology , NSHM Knowledge Campus , Kolkata , West Bengal , India
| | - Faiqa Ahmed
- a Department of Pharmaceutical Technology , NSHM Knowledge Campus , Kolkata , West Bengal , India
| | - Sritama Banerjee
- a Department of Pharmaceutical Technology , NSHM Knowledge Campus , Kolkata , West Bengal , India
| | - Urmi Saha
- a Department of Pharmaceutical Technology , NSHM Knowledge Campus , Kolkata , West Bengal , India
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Chan IH, Van Hoof D, Abramova M, Bilardello M, Mar E, Jorgensen B, McCauley S, Bal H, Oft M, Van Vlasselaer P, Mumm JB. PEGylated IL-10 Activates Kupffer Cells to Control Hypercholesterolemia. PLoS One 2016; 11:e0156229. [PMID: 27299860 PMCID: PMC4907428 DOI: 10.1371/journal.pone.0156229] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Accepted: 05/11/2016] [Indexed: 01/29/2023] Open
Abstract
Interleukin-10 (IL-10) is a multifunctional cytokine that exerts potent context specific immunostimulatory and immunosuppressive effects. We have investigated the mechanism by which PEGylated rIL-10 regulates plasma cholesterol in mice and humans. In agreement with previous work on rIL-10, we report that PEGylated rIL-10 harnesses the myeloid immune system to control total plasma cholesterol levels. We have discovered that PEG-rMuIL-10’s dramatic lowering of plasma cholesterol is dependent on phagocytotic cells. In particular, PEG-rHuIL-10 enhances cholesterol uptake by Kupffer cells. In addition, removal of phagocytotic cells dramatically increases plasma cholesterol levels, suggesting for the first time that immunological cells are implicitly involved in regulating total cholesterol levels. These data suggest that treatment with PEG-rIL-10 potentiates endogenous cholesterol regulating cell populations not currently targeted by standard of care therapeutics. Furthermore, we show that IL-10’s increase of Kupffer cell cholesterol phagocytosis is concomitant with decreases in liver cholesterol and triglycerides. This leads to the reversal of early periportal liver fibrosis and facilitates the restoration of liver health. These data recommend PEG-rIL-10 for evaluation in the treatment of fatty liver disease and preventing its progression to non-alcoholic steatohepatitis. In direct confirmation of our in vivo findings in the treatment of hypercholesterolemic mice with PEG-rMuIL-10, we report that treatment of hypercholesterolemic cancer patients with PEG-rHuIL-10 lowers total plasma cholesterol by up to 50%. Taken together these data suggest that PEG-rIL-10’s cholesterol regulating biology is consistent between mice and humans.
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Affiliation(s)
- Ivan H. Chan
- ARMO BioSciences, Inc., 575 Chesapeake Drive, Redwood City, CA, 94063, United States of America
| | - Dennis Van Hoof
- ARMO BioSciences, Inc., 575 Chesapeake Drive, Redwood City, CA, 94063, United States of America
| | - Marina Abramova
- ARMO BioSciences, Inc., 575 Chesapeake Drive, Redwood City, CA, 94063, United States of America
| | - Melissa Bilardello
- ARMO BioSciences, Inc., 575 Chesapeake Drive, Redwood City, CA, 94063, United States of America
| | - Elliot Mar
- ARMO BioSciences, Inc., 575 Chesapeake Drive, Redwood City, CA, 94063, United States of America
| | - Brett Jorgensen
- ARMO BioSciences, Inc., 575 Chesapeake Drive, Redwood City, CA, 94063, United States of America
| | - Scott McCauley
- ARMO BioSciences, Inc., 575 Chesapeake Drive, Redwood City, CA, 94063, United States of America
| | - Harminder Bal
- ARMO BioSciences, Inc., 575 Chesapeake Drive, Redwood City, CA, 94063, United States of America
| | - Martin Oft
- ARMO BioSciences, Inc., 575 Chesapeake Drive, Redwood City, CA, 94063, United States of America
| | - Peter Van Vlasselaer
- ARMO BioSciences, Inc., 575 Chesapeake Drive, Redwood City, CA, 94063, United States of America
| | - John B. Mumm
- ARMO BioSciences, Inc., 575 Chesapeake Drive, Redwood City, CA, 94063, United States of America
- * E-mail:
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Tran TTT, Postal BG, Demignot S, Ribeiro A, Osinski C, Pais de Barros JP, Blachnio-Zabielska A, Leturque A, Rousset M, Ferré P, Hajduch E, Carrière V. Short Term Palmitate Supply Impairs Intestinal Insulin Signaling via Ceramide Production. J Biol Chem 2016; 291:16328-38. [PMID: 27255710 DOI: 10.1074/jbc.m115.709626] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Indexed: 12/16/2022] Open
Abstract
The worldwide prevalence of metabolic diseases is increasing, and there are global recommendations to limit consumption of certain nutrients, especially saturated lipids. Insulin resistance, a common trait occurring in obesity and type 2 diabetes, is associated with intestinal lipoprotein overproduction. However, the mechanisms by which the intestine develops insulin resistance in response to lipid overload remain unknown. Here, we show that insulin inhibits triglyceride secretion and intestinal microsomal triglyceride transfer protein expression in vivo in healthy mice force-fed monounsaturated fatty acid-rich olive oil but not in mice force-fed saturated fatty acid-rich palm oil. Moreover, when mouse intestine and human Caco-2/TC7 enterocytes were treated with the saturated fatty acid, palmitic acid, the insulin-signaling pathway was impaired. We show that palmitic acid or palm oil increases ceramide production in intestinal cells and that treatment with a ceramide analogue partially reproduces the effects of palmitic acid on insulin signaling. In Caco-2/TC7 enterocytes, ceramide effects on insulin-dependent AKT phosphorylation are mediated by protein kinase C but not by protein phosphatase 2A. Finally, inhibiting de novo ceramide synthesis improves the response of palmitic acid-treated Caco-2/TC7 enterocytes to insulin. These results demonstrate that a palmitic acid-ceramide pathway accounts for impaired intestinal insulin sensitivity, which occurs within several hours following initial lipid exposure.
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Affiliation(s)
- Thi Thu Trang Tran
- From the Centre de Recherche des Cordeliers, INSERM, UPMC Univ Paris 06, Sorbonne Universités, Université Paris Descartes, Sorbonne Paris Cité, Ecole Pratique des Hautes Etudes (EPHE), Université Paris Sciences et Lettres, Université Paris Diderot, CNRS, Institute of Cardiometabolism and Nutrition, F-75006 Paris, France
| | - Bárbara Graziela Postal
- From the Centre de Recherche des Cordeliers, INSERM, UPMC Univ Paris 06, Sorbonne Universités, Université Paris Descartes, Sorbonne Paris Cité, Ecole Pratique des Hautes Etudes (EPHE), Université Paris Sciences et Lettres, Université Paris Diderot, CNRS, Institute of Cardiometabolism and Nutrition, F-75006 Paris, France
| | - Sylvie Demignot
- From the Centre de Recherche des Cordeliers, INSERM, UPMC Univ Paris 06, Sorbonne Universités, Université Paris Descartes, Sorbonne Paris Cité, Ecole Pratique des Hautes Etudes (EPHE), Université Paris Sciences et Lettres, Université Paris Diderot, CNRS, Institute of Cardiometabolism and Nutrition, F-75006 Paris, France
| | - Agnès Ribeiro
- From the Centre de Recherche des Cordeliers, INSERM, UPMC Univ Paris 06, Sorbonne Universités, Université Paris Descartes, Sorbonne Paris Cité, Ecole Pratique des Hautes Etudes (EPHE), Université Paris Sciences et Lettres, Université Paris Diderot, CNRS, Institute of Cardiometabolism and Nutrition, F-75006 Paris, France
| | - Céline Osinski
- From the Centre de Recherche des Cordeliers, INSERM, UPMC Univ Paris 06, Sorbonne Universités, Université Paris Descartes, Sorbonne Paris Cité, Ecole Pratique des Hautes Etudes (EPHE), Université Paris Sciences et Lettres, Université Paris Diderot, CNRS, Institute of Cardiometabolism and Nutrition, F-75006 Paris, France
| | | | | | - Armelle Leturque
- From the Centre de Recherche des Cordeliers, INSERM, UPMC Univ Paris 06, Sorbonne Universités, Université Paris Descartes, Sorbonne Paris Cité, Ecole Pratique des Hautes Etudes (EPHE), Université Paris Sciences et Lettres, Université Paris Diderot, CNRS, Institute of Cardiometabolism and Nutrition, F-75006 Paris, France
| | - Monique Rousset
- From the Centre de Recherche des Cordeliers, INSERM, UPMC Univ Paris 06, Sorbonne Universités, Université Paris Descartes, Sorbonne Paris Cité, Ecole Pratique des Hautes Etudes (EPHE), Université Paris Sciences et Lettres, Université Paris Diderot, CNRS, Institute of Cardiometabolism and Nutrition, F-75006 Paris, France
| | - Pascal Ferré
- INSERM UMRS 1138, Sorbonne Universités, UPMC Univ Paris 06, Sorbonne Paris Cité, Université Paris Descartes, Université Paris Diderot, Institute of Cardiometabolism and Nutrition (ICAN), Centre de Recherche des Cordeliers, F-75006 Paris, France
| | - Eric Hajduch
- INSERM UMRS 1138, Sorbonne Universités, UPMC Univ Paris 06, Sorbonne Paris Cité, Université Paris Descartes, Université Paris Diderot, Institute of Cardiometabolism and Nutrition (ICAN), Centre de Recherche des Cordeliers, F-75006 Paris, France
| | - Véronique Carrière
- From the Centre de Recherche des Cordeliers, INSERM, UPMC Univ Paris 06, Sorbonne Universités, Université Paris Descartes, Sorbonne Paris Cité, Ecole Pratique des Hautes Etudes (EPHE), Université Paris Sciences et Lettres, Université Paris Diderot, CNRS, Institute of Cardiometabolism and Nutrition, F-75006 Paris, France,
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Mulvihill EE, Burke AC, Huff MW. Citrus Flavonoids as Regulators of Lipoprotein Metabolism and Atherosclerosis. Annu Rev Nutr 2016; 36:275-99. [PMID: 27146015 DOI: 10.1146/annurev-nutr-071715-050718] [Citation(s) in RCA: 149] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Citrus flavonoids are polyphenolic compounds with significant biological properties. This review summarizes recent advances in understanding the ability of citrus flavonoids to modulate lipid metabolism, other metabolic parameters related to the metabolic syndrome, and atherosclerosis. Citrus flavonoids, including naringenin, hesperitin, nobiletin, and tangeretin, have emerged as potential therapeutics for the treatment of metabolic dysregulation. Epidemiological studies reveal an association between the intake of citrus flavonoid-containing foods and a decreased incidence of cardiovascular disease. Studies in cell culture and animal models, as well as a limited number of clinical studies, reveal the lipid-lowering, insulin-sensitizing, antihypertensive, and anti-inflammatory properties of citrus flavonoids. In animal models, supplementation of rodent diets with citrus flavonoids prevents hepatic steatosis, dyslipidemia, and insulin resistance primarily through inhibition of hepatic fatty acid synthesis and increased fatty acid oxidation. Citrus flavonoids blunt the inflammatory response in metabolically important tissues including liver, adipose, kidney, and the aorta. The mechanisms underlying flavonoid-induced metabolic regulation have not been completely established, although several potential targets have been identified. In mouse models, citrus flavonoids show marked suppression of atherogenesis through improved metabolic parameters as well as through direct impact on the vessel wall. Recent studies support a role for citrus flavonoids in the treatment of dyslipidemia, insulin resistance, hepatic steatosis, obesity, and atherosclerosis. Larger human studies examining dose, bioavailability, efficacy, and safety are required to promote the development of these promising therapeutic agents.
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Affiliation(s)
- Erin E Mulvihill
- Department of Biochemistry, University of Western Ontario, London, ON, Canada N6A 5B7; ; .,Current address: Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, ON, Canada M5T 3L9;
| | - Amy C Burke
- Department of Biochemistry, University of Western Ontario, London, ON, Canada N6A 5B7; ;
| | - Murray W Huff
- Department of Biochemistry, University of Western Ontario, London, ON, Canada N6A 5B7; ; .,Department of Medicine, Robarts Research Institute, University of Western Ontario, London, ON, Canada N6A 5B7
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25
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Kamada Y, Ebisutani Y, Kida S, Mizutani K, Akita M, Yamamoto A, Fujii H, Sobajima T, Terao N, Takamatsu S, Yoshida Y, Takehara T, Miyoshi E. Ectopic expression of N-acetylglucosaminyltransferase V accelerates hepatic triglyceride synthesis. Hepatol Res 2016; 46:E118-29. [PMID: 26041473 DOI: 10.1111/hepr.12541] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 05/24/2015] [Accepted: 06/02/2015] [Indexed: 01/28/2023]
Abstract
AIM Glycosylation changes induce various types of biological phenomena in human diseases. N-Acetylglucosaminyltransferase V (GnT-V) is one of the most important glycosyltransferases involved in cancer biology. Recently, many researchers have challenged studies of lipid metabolism in cancer. To elucidate the relationships between cancer and lipid metabolism more precisely, we investigated the effects of GnT-V on lipid metabolism. In this study, we investigated the effects of aberrant glycosylation by GnT-V on hepatic triglyceride production. METHODS We compared lipid metabolism in GnT-V transgenic (Tg) mice with that of wild-type (WT) mice fed with normal chow or a choline-deficient amino acid-defined (CDAA) diet in vivo. HepG2 cells and GnT-V transfectants of Hep3B cells were used in an in vitro study. RESULTS Serum triglyceride levels and hepatic very low-density lipoprotein (VLDL) secretion in Tg mice were significantly elevated compared with that of WT mice. Hepatic lipogenic genes (Lxrα, Srebp1, Fas and Acc) and VLDL secretion-related gene (Mttp1) were significantly higher in Tg mice. Expression of these genes was also significantly higher in GnT-V transfectants than in mock cells. Knockdown of GnT-V decreased, while both epidermal growth factor and transforming growth factor-β1 stimulation increased LXRα gene expression in HepG2 cells. Finally, we found that the blockade of VLDL secretion by CDAA diet induced massive hepatic steatosis in Tg mice. CONCLUSION Our study demonstrates that enhancement of hepatic GnT-V activity accelerates triglyceride synthesis and VLDL secretion. Glycosylation modification by GnT-V regulation could be a novel target for a therapeutic approach to lipid metabolism.
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Affiliation(s)
- Yoshihiro Kamada
- Departments of Molecular Biochemistry and Clinical Investigation, Suita, Japan.,Gastroenterology and Hepatology, Osaka University, Graduate School of Medicine, Suita, Japan
| | - Yusuke Ebisutani
- Departments of Molecular Biochemistry and Clinical Investigation, Suita, Japan
| | - Sachiho Kida
- Departments of Molecular Biochemistry and Clinical Investigation, Suita, Japan
| | - Kayo Mizutani
- Departments of Molecular Biochemistry and Clinical Investigation, Suita, Japan
| | - Maaya Akita
- Departments of Molecular Biochemistry and Clinical Investigation, Suita, Japan
| | - Akiko Yamamoto
- Departments of Molecular Biochemistry and Clinical Investigation, Suita, Japan
| | - Hironobu Fujii
- Departments of Molecular Biochemistry and Clinical Investigation, Suita, Japan
| | - Tomoaki Sobajima
- Departments of Molecular Biochemistry and Clinical Investigation, Suita, Japan
| | - Naoko Terao
- Departments of Molecular Biochemistry and Clinical Investigation, Suita, Japan
| | - Shinji Takamatsu
- Departments of Molecular Biochemistry and Clinical Investigation, Suita, Japan
| | - Yuichi Yoshida
- Gastroenterology and Hepatology, Osaka University, Graduate School of Medicine, Suita, Japan
| | - Tetsuo Takehara
- Gastroenterology and Hepatology, Osaka University, Graduate School of Medicine, Suita, Japan
| | - Eiji Miyoshi
- Departments of Molecular Biochemistry and Clinical Investigation, Suita, Japan
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Hashimoto T, Ide T. Activity and mRNA Levels of Enzymes Involved in Hepatic Fatty Acid Synthesis in Rats Fed Naringenin. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2015; 63:9536-9542. [PMID: 26466635 DOI: 10.1021/acs.jafc.5b03734] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We investigated the physiological activity of naringenin in affecting hepatic lipogenesis and serum and liver lipid levels in rats. Rats were fed diets containing 0, 1, or 2.5 g/kg naringenin for 15 d. Naringenin at a dietary level of 2.5 g/kg significantly decreased the activities and the mRNA levels of various lipogenic enzymes and sterol regulatory element binding protein-1c (SREBP-1c) mRNA level. The activities and the mRNA levels were also 9-22% and 12-38% lower, respectively, in rats fed a 1 g/kg naringenin diet than in the animals fed a naringenin-free diet, although the differences were not significant in many cases. Naringenin at 2.5 g/kg significantly lowered serum triacylglycerol, cholesterol, and phospholipid and hepatic triacylglycerol and cholesterol. This flavonoid at 1.0 g/kg also significantly lowered these parameters except for serum triacylglycerol. Naringenin levels in serum and liver dose-dependently increased, and hepatic concentrations reached levels that can affect various signaling pathways.
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Affiliation(s)
- Toru Hashimoto
- Nippon Shinyaku Co., Ltd. , 14 Nishinosho-Monguchi, Kisshoin, Minami-ku, Kyoto 601-8550, Japan
| | - Takashi Ide
- Department of Food and Nutrition, Faculty of Human Life, Jumonji University , 2-1-28 Sugasawa, Niiza, Saitama 352-8510, Japan
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Novotny JA, Baer DJ, Khoo C, Gebauer SK, Charron CS. Cranberry juice consumption lowers markers of cardiometabolic risk, including blood pressure and circulating C-reactive protein, triglyceride, and glucose concentrations in adults. J Nutr 2015; 145:1185-93. [PMID: 25904733 DOI: 10.3945/jn.114.203190] [Citation(s) in RCA: 101] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Accepted: 03/17/2015] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND Cardiometabolic risk is the risk of cardiovascular disease (CVD), diabetes, or stroke, which are leading causes of mortality and morbidity worldwide. OBJECTIVE The objective of this study was to determine the potential of low-calorie cranberry juice (LCCJ) to lower cardiometabolic risk. METHODS A double-blind, placebo-controlled, parallel-arm study was conducted with controlled diets. Thirty women and 26 men (mean baseline characteristics: 50 y; weight, 79 kg; body mass index, 28 kg/m(2)) completed an 8-wk intervention with LCCJ or a flavor/color/energy-matched placebo beverage. Twice daily volunteers consumed 240 mL of LCCJ or the placebo beverage, containing 173 or 62 mg of phenolic compounds and 6.5 or 7.5 g of total sugar per 240-mL serving, respectively. RESULTS Fasting serum triglycerides (TGs) were lower after consuming LCCJ and demonstrated a treatment × baseline interaction such that the participants with higher baseline TG concentrations were more likely to experience a larger treatment effect (1.15 ± 0.04 mmol/L vs. 1.25 ± 0.04 mmol/L, respectively; P = 0.027). Serum C-reactive protein (CRP) was lower for individuals consuming LCCJ than for individuals consuming the placebo beverage [ln transformed values of 0.522 ± 0.115 ln(mg/L) vs. 0.997 ± 0.120 ln(mg/L), P = 0.0054, respectively, and equivalent to 1.69 mg/L vs. 2.71 mg/L back-transformed]. LCCJ lowered diastolic blood pressure (BP) compared with the placebo beverage (69.2 ± 0.8 mm Hg for LCCJ vs. 71.6 ± 0.8 mm Hg for placebo; P = 0.048). Fasting plasma glucose was lower (P = 0.03) in the LCCJ group (5.32 ± 0.03 mmol/L) than in the placebo group (5.42 ± 0.03 mmol/L), and LCCJ had a beneficial effect on homeostasis model assessment of insulin resistance for participants with high baseline values (P = 0.035). CONCLUSION LCCJ can improve several risk factors of CVD in adults, including circulating TGs, CRP, and glucose, insulin resistance, and diastolic BP. This trial was registered at clinicaltrials.gov as NCT01295684.
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Affiliation(s)
- Janet A Novotny
- Beltsville Human Nutrition Research Center, Agricultural Research Service, USDA, Beltsville, MD; and
| | - David J Baer
- Beltsville Human Nutrition Research Center, Agricultural Research Service, USDA, Beltsville, MD; and
| | - Christina Khoo
- Ocean Spray Cranberries, Inc., Lakeville-Middleborough, MA
| | - Sarah K Gebauer
- Beltsville Human Nutrition Research Center, Agricultural Research Service, USDA, Beltsville, MD; and
| | - Craig S Charron
- Beltsville Human Nutrition Research Center, Agricultural Research Service, USDA, Beltsville, MD; and
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Assini JM, Mulvihill EE, Burke AC, Sutherland BG, Telford DE, Chhoker SS, Sawyez CG, Drangova M, Adams AC, Kharitonenkov A, Pin CL, Huff MW. Naringenin prevents obesity, hepatic steatosis, and glucose intolerance in male mice independent of fibroblast growth factor 21. Endocrinology 2015; 156:2087-102. [PMID: 25774553 DOI: 10.1210/en.2014-2003] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The molecular mechanisms and metabolic pathways whereby the citrus flavonoid, naringenin, reduces dyslipidemia and improves glucose tolerance were investigated in C57BL6/J wild-type mice and fibroblast growth factor 21 (FGF21) null (Fgf21(-/-)) mice. FGF21 regulates energy homeostasis and the metabolic adaptation to fasting. One avenue of this regulation is through induction of peroxisome proliferator-activated receptor-γ coactivator-1α (Pgc1a), a regulator of hepatic fatty acid oxidation and ketogenesis. Because naringenin is a potent activator of hepatic FA oxidation, we hypothesized that induction of FGF21 might be an integral part of naringenin's mechanism of action. Furthermore, we predicted that FGF21 deficiency would potentiate high-fat diet (HFD)-induced metabolic dysregulation and compromise metabolic protection by naringenin. The absence of FGF21 exacerbated the response to a HFD. Interestingly, naringenin supplementation to the HFD robustly prevented obesity in both genotypes. Gene expression analysis suggested that naringenin was not primarily targeting fatty acid metabolism in white adipose tissue. Naringenin corrected hepatic triglyceride concentrations and normalized hepatic expression of Pgc1a, Cpt1a, and Srebf1c in both wild-type and Fgf21(-/-) mice. HFD-fed Fgf21(-/-) mice displayed greater muscle triglyceride deposition, hyperinsulinemia, and impaired glucose tolerance as compared with wild-type mice, confirming the role of FGF21 in insulin sensitivity; however, naringenin supplementation improved these metabolic parameters in both genotypes. We conclude that FGF21 deficiency exacerbates HFD-induced obesity, hepatic steatosis, and insulin resistance. Furthermore, FGF21 is not required for naringenin to protect mice from HFD-induced metabolic dysregulation. Collectively these studies support the concept that naringenin has potent lipid-lowering effects and may act as an insulin sensitizer in vivo.
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Affiliation(s)
- Julia M Assini
- Department of Vascular Biology (J.M.A., E.E.M., A.C.B., B.G.S., D.E.T., S.S.C., C.G.S., M.W.H.) and Imaging Research Laboratories (M.D.), Robarts Research Institute, London, Ontario, Canada N6A 5B7; Children's Health Research Institute and Departments of Paediatrics, Physiology and Pharmacology, and Oncology (C.L.P.); Departments of Biochemistry (J.M.A., E.E.M., A.C.B., S.S.C., M.W.H.), Medical Biophysics (M.D.) and Medicine (D.E.T., C.G.S., M.W.H.), The University of Western Ontario, London, Ontario, Canada N6A 5B7; and Lilly Research Laboratories (A.C.A., A.K.), Division of Eli Lilly and Company, Indianapolis, Indiana 46285
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Yao Z, Zhang L, Ji G. Efficacy of polyphenolic ingredients of Chinese herbs in treating dyslipidemia of metabolic syndromes. JOURNAL OF INTEGRATIVE MEDICINE-JIM 2014; 12:135-46. [PMID: 24861834 DOI: 10.1016/s2095-4964(14)60023-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
There is an increasing interest and popularity of Chinese herbal medicine worldwide, which is accompanied by increasing concerns about its effectiveness and potential toxicity. Several ingredients, such as polyphenolic compounds berberine, flavonoids, and curcumin, have been studied extensively by using various animal models. Effectiveness of treatment and amelioration of metabolic syndromes, including insulin resistance and dyslipidemia, has been demonstrated. This review summarizes the major checkpoints and contributing factors in regulation of exogenous and endogenous lipid metabolism, with particular emphasis centered on triglyceride-rich and cholesterol-rich lipoproteins. Available experimental evidence demonstrating the lipid-lowering effect of berberine, flavonoids and curcumin in cell culture and animal models is compiled, and the strengths and shortcomings of experimental designs in these studies are discussed.
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Affiliation(s)
- Zemin Yao
- Department of Biochemistry, Microbiology and Immunology, Ottawa Institute of System Biology, University of Ottawa, Ottawa K1H 8M5, Canada; E-mail:
| | - Li Zhang
- Institute of Digestive Diseases, Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China
| | - Guang Ji
- Institute of Digestive Diseases, Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China
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Shi SG, Yang M, Zhang M, Wang P, Kang YX, Liu JJ. Genome-wide transcriptome analysis of genes involved in flavonoid biosynthesis between red and white strains of Magnolia sprengeri pamp. BMC Genomics 2014; 15:706. [PMID: 25150046 PMCID: PMC4156625 DOI: 10.1186/1471-2164-15-706] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2014] [Accepted: 08/21/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Magnolia sprengeri Pamp is one of the most highly valuable medicinal and ornamental plants of the Magnolia Family. The natural color of M. sprengeri is variable. The complete genome sequence of M. sprengeri is not available; therefore we sequenced the transcriptome of white and red petals of M. sprengeri using Illumina technology. We focused on the identity of structural and regulatory genes encoding the enzymes involved in the determination of flower color. RESULTS We sequenced and annotated a reference transcriptome for M. sprengeri, and aimed to capture the transcriptional determinanats of flower color. We sequenced a normalized cDNA library of white and red petals using Illumina technology. The resulting reads were assembled into 77,048 unique sequences, of which 28,243 could be annotated by Gene Ontology (GO) analysis, while 48,805 transcripts lacked GO annotation. The main enzymes involved in the flavonoid biosynthesis, such as phenylalanine ammonia-Lyase, cinnamat-4-Hydroxylase, dihydroflavonol-4-reductase, flavanone 3-hydroxylase, flavonoid-3'-hydroxylase, flavonol synthase, chalcone synthase and anthocyanidin synthase, were identified in the transcriptome. A total of 270 transcription factors were sorted into three families, including MYB, bHLH and WD40 types. Among these transcription factors, eight showed 4-fold or greater changes in transcript abundance in red petals compared with white petals. High-performance liquid chromatography analysis of anthocyanin compositions showed that the main anthocyanin in the petals of M. sprengeri is cyanidin-3-O-glucoside chloride and its content in red petals was 26-fold higher than that in white petals. CONCLUSION This study presents the first next-generation sequencing effort and transcriptome analysis of a non-model plant from the Family Magnoliaceae. Genes encoding key enzymes were identified and the metabolic pathways involved in biosynthesis and catabolism of M. sprengeri flavonoids were reconstructed. Identification of these genes and pathways adds to the current knowledge of the molecular biology and biochemistry of their production in plant. Such insights into the mechanisms supporting metabolic processes could be used to genetically to enhance flower color among members of the Magnoliaceae.
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Affiliation(s)
| | | | | | | | | | - Jian-Jun Liu
- College of Forestry, Northwest A&F University, Yangling, Shaanxi 712100, China.
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31
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Su KY, Hsieh CY, Chen YW, Chuang CT, Chen CT, Chen YLS. Taiwanese Green Propolis and Propolin G Protect the Liver from the Pathogenesis of Fibrosis via Eliminating TGF-β-Induced Smad2/3 Phosphorylation. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:3192-3201. [PMID: 24625297 DOI: 10.1021/jf500096c] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Pathogenesis of fibrosis is a common process leading to chronic liver diseases and liver cirrhosis. New compounds for disease treatment and adjuvant therapy have been important issues in recent years. In this study, we isolated propolin G from Taiwanese green propolis (TGP) and investigated its antifibrotic effects by utilizing active hepatic stellate cells (HSCs) fibrosis model. Our results showed that TGP and propolin G inhibited α-SMA, collagen expression, and proliferation of HSC-T6 cells after TGF-β treatment. They also reduced the accumulation of extracellular matrix (ECM) components such as collagen Iα1 (Col Iα1) through down-regulating JNK signaling. Subsequently, mRNA and protein expression of Smad2/3 but no other Smad members was specifically down-regulated in the presence of propolin G. This effect also significantly induced apoptosis-associated expression of cleaved caspase-3 and caspase-7 proteins for fibrotic cell clearance. In in vivo experiments, we found that propolin G and TGP can reduce plasma alanine aminotransferase (ALT) activation and perhaps lead to the prevention of alcohol-induced liver cirrhosis. Furthermore, TGP can significantly decrease the malondialdehyde (MDA) level but has no influence on plasma or hepatic superoxide dismutase (SOD) and glutathione peroxidase (GPx) levels, suggesting TGP protects the liver from alcohol-induced injury through antioxidant-independent pathways. In conclusion, this study provides a new perspective of propolin G and TGP on liver protection, and its application has potential for health management by daily supplement or adjuvant therapy in related diseases.
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Affiliation(s)
- Kang-Yi Su
- Department of Laboratory Medicine, National Taiwan University Hospital , Taipei 100, Taiwan
| | - Chih-Yu Hsieh
- Department of Biotechnology and Animal Science, National Ilan University , Ilan, Taiwan
| | - Yue-Wen Chen
- Department of Biotechnology and Animal Science, National Ilan University , Ilan, Taiwan
| | - Chin-Ting Chuang
- Department of Biotechnology and Animal Science, National Ilan University , Ilan, Taiwan
| | - Chun-Ting Chen
- Department of Biotechnology and Animal Science, National Ilan University , Ilan, Taiwan
| | - Yi-Lin Sophia Chen
- Department of Biotechnology and Animal Science, National Ilan University , Ilan, Taiwan
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Marzio DLHD, Fenkel JM. Complementary and alternative medications in hepatitis C infection. World J Hepatol 2014; 6:9-16. [PMID: 24653790 PMCID: PMC3953807 DOI: 10.4254/wjh.v6.i1.9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Revised: 12/22/2013] [Accepted: 01/06/2014] [Indexed: 02/06/2023] Open
Abstract
Chronic hepatitis C (CHC) infection affects almost 3% of the global population and can lead to cirrhosis, liver failure, and hepatocellular carcinoma in a significant number of those infected. Until recently, the only treatments available were pegylated interferon and ribavirin, which traditionally were not very effective and have considerable side effects. For this reason, interest in complementary and alternative medications (CAM) in the management of hepatitis C has been investigated. Some CAM has demonstrated therapeutic potential in chronic hepatitis C treatment. Unfortunately, some CAM has been shown to have the potential to cause drug-induced liver injury. This article will review and evaluate many of the natural molecules that interact with the hepatitis C virus (HCV) life cycle and discuss their potential use and safety in HCV therapy, as well as highlight some important interactions between medical and complementary treatments.
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Affiliation(s)
- Dina L Halegoua-De Marzio
- Dina L Halegoua-De Marzio, Jonathan M Fenkel, Division of Gastroenterology and Hepatology, Thomas Jefferson University Hospital, Philadelphia, PA 19107, United States
| | - Jonathan M Fenkel
- Dina L Halegoua-De Marzio, Jonathan M Fenkel, Division of Gastroenterology and Hepatology, Thomas Jefferson University Hospital, Philadelphia, PA 19107, United States
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33
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Veloso CDC, de Oliveira MC, Oliveira CDC, Rodrigues VG, Giusti-Paiva A, Teixeira MM, Duarte ID, Ferreira AVM, Perez ADC. Hydroethanolic extract of Pyrostegia venusta (Ker Gawl.) Miers flowers improves inflammatory and metabolic dysfunction induced by high-refined carbohydrate diet. JOURNAL OF ETHNOPHARMACOLOGY 2013; 151:722-728. [PMID: 24309496 DOI: 10.1016/j.jep.2013.11.046] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 11/15/2013] [Accepted: 11/24/2013] [Indexed: 06/02/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Pyrostegia venusta is used in traditional Brazilian medicine as a general tonic to treat any inflammatory disease. Several studies have demonstrated that medicinal plants constitute a therapeutic approach for the treatment of obesity-related metabolic and inflammatory disarrangement. Accordingly, we investigated the effects of hydroethanolic extract of Pyrostegia venusta flowers (PvHE) supplementation for the treatment of inflammatory and metabolic dysfunction induced by high-refined-carbohydrate (HC) diet. MATERIAL AND METHODS The BALB/c mice were fed chow or HC diet for 8 weeks. Part of these animals was fed with HC diet supplemented with PvHE on the 9th week until the 12th week. At the end of the dietary intervention, animals were sacrificed. RESULTS We observed that PvHE decreased adiposity and adipocyte area; improved glucose intolerance; reduced serum triacylglycerol levels and systemic inflammatory cells; and also reduced some inflammatory mediators levels in adipose tissue and liver. CONCLUSION The results showed that PvHE has beneficial effects and may treat inflammatory and metabolic dysfunction induced by HC diet, that are associated to a negative modulation of the inflammatory process at systemic and local levels.
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Affiliation(s)
- Clarice de Carvalho Veloso
- Department of Pharmacology, Institute of Biological Sciences, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil
| | - Marina Chaves de Oliveira
- Imunopharmacology, Department of Biochemistry and Immunology, Institute of Biological Sciences, UFMG, Belo Horizonte, Minas Gerais, Brazil; Department of Nutrition, Nursing School, UFMG, Belo Horizonte, Minas Gerais, Brazil
| | - Cristina da Costa Oliveira
- Department of Pharmacology, Institute of Biological Sciences, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil
| | | | - Alexandre Giusti-Paiva
- Department of Physiological Sciences, Institute of Biomedical Sciences, Federal University of Alfenas (UNIFAL), Alfenas, Minas Gerais, Brazil
| | - Mauro Martins Teixeira
- Imunopharmacology, Department of Biochemistry and Immunology, Institute of Biological Sciences, UFMG, Belo Horizonte, Minas Gerais, Brazil
| | - Igor Dimitri Duarte
- Department of Pharmacology, Institute of Biological Sciences, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil
| | - Adaliene Versiani Matos Ferreira
- Imunopharmacology, Department of Biochemistry and Immunology, Institute of Biological Sciences, UFMG, Belo Horizonte, Minas Gerais, Brazil; Department of Nutrition, Nursing School, UFMG, Belo Horizonte, Minas Gerais, Brazil
| | - Andrea de Castro Perez
- Department of Pharmacology, Institute of Biological Sciences, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil.
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Borén J, Taskinen MR, Olofsson SO, Levin M. Ectopic lipid storage and insulin resistance: a harmful relationship. J Intern Med 2013; 274:25-40. [PMID: 23551521 DOI: 10.1111/joim.12071] [Citation(s) in RCA: 157] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Obesity increases the risk of metabolic diseases, including insulin resistance and type 2 diabetes, as well as cardiovascular disease. In addition to lipid accumulation in adipose tissue, obesity is associated with increased lipid storage in ectopic tissues, such as skeletal muscle and liver. Furthermore, lipid accumulation in the heart may result in cardiac dysfunction and heart failure. It has recently been demonstrated that intracellular lipid accumulation in ectopic tissues leads to pathological responses and impaired insulin signalling. Here, we will review the current understanding of how lipid storage and lipid droplet physiology affect the risk of developing metabolic diseases.
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Affiliation(s)
- J Borén
- Department of Molecular and Clinical Medicine, University of Gothenburg, Gothenburg, Sweden.
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35
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Characterization of regiospecific flavonoid 3′/5′-O-methyltransferase from tomato and its application in flavonoid biotransformation. ACTA ACUST UNITED AC 2012. [DOI: 10.1007/s13765-012-2193-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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De novo production of the flavonoid naringenin in engineered Saccharomyces cerevisiae. Microb Cell Fact 2012; 11:155. [PMID: 23216753 PMCID: PMC3539886 DOI: 10.1186/1475-2859-11-155] [Citation(s) in RCA: 239] [Impact Index Per Article: 19.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Accepted: 11/15/2012] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Flavonoids comprise a large family of secondary plant metabolic intermediates that exhibit a wide variety of antioxidant and human health-related properties. Plant production of flavonoids is limited by the low productivity and the complexity of the recovered flavonoids. Thus to overcome these limitations, metabolic engineering of specific pathway in microbial systems have been envisaged to produce high quantity of a single molecules. RESULT Saccharomyces cerevisiae was engineered to produce the key intermediate flavonoid, naringenin, solely from glucose. For this, specific naringenin biosynthesis genes from Arabidopsis thaliana were selected by comparative expression profiling and introduced in S. cerevisiae. The sole expression of these A. thaliana genes yielded low extracellular naringenin concentrations (<5.5 μM). To optimize naringenin titers, a yeast chassis strain was developed. Synthesis of aromatic amino acids was deregulated by alleviating feedback inhibition of 3-deoxy-d-arabinose-heptulosonate-7-phosphate synthase (Aro3, Aro4) and byproduct formation was reduced by eliminating phenylpyruvate decarboxylase (Aro10, Pdc5, Pdc6). Together with an increased copy number of the chalcone synthase gene and expression of a heterologous tyrosine ammonia lyase, these modifications resulted in a 40-fold increase of extracellular naringenin titers (to approximately 200 μM) in glucose-grown shake-flask cultures. In aerated, pH controlled batch reactors, extracellular naringenin concentrations of over 400 μM were reached. CONCLUSION The results reported in this study demonstrate that S. cerevisiae is capable of de novo production of naringenin by coexpressing the naringenin production genes from A. thaliana and optimization of the flux towards the naringenin pathway. The engineered yeast naringenin production host provides a metabolic chassis for production of a wide range of flavonoids and exploration of their biological functions.
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Jiang ZG, Robson SC, Yao Z. Lipoprotein metabolism in nonalcoholic fatty liver disease. J Biomed Res 2012; 27:1-13. [PMID: 23554788 PMCID: PMC3596749 DOI: 10.7555/jbr.27.20120077] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Revised: 08/23/2012] [Accepted: 08/29/2012] [Indexed: 12/18/2022] Open
Abstract
Nonalcoholic fatty liver disease (NAFLD), an escalating health problem worldwide, covers a spectrum of pathologies characterized by fatty accumulation in hepatocytes in early stages, with potential progression to liver inflammation, fibrosis, and failure. A close, yet poorly understood link exists between NAFLD and dyslipidemia, a constellation of abnormalities in plasma lipoproteins including triglyceride-rich very low density lipoproteins. Apolipoproteins are a group of primarily liver-derived proteins found in serum lipoproteins; they not only play an extracellular role in lipid transport between vital organs through circulation, but also play an important intracellular role in hepatic lipoprotein assembly and secretion. The liver functions as the central hub for lipoprotein metabolism, as it dictates lipoprotein production and to a significant extent modulates lipoprotein clearance. Lipoprotein metabolism is an integral component of hepatocellular lipid homeostasis and is implicated in the pathogenesis, potential diagnosis, and treatment of NAFLD.
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Affiliation(s)
- Zhenghui Gordon Jiang
- Department of Medicine, Beth Israel Deaconess Medical Center/Harvard Medical School, Boston, MA, USA
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Calland N, Dubuisson J, Rouillé Y, Séron K. Hepatitis C virus and natural compounds: a new antiviral approach? Viruses 2012; 4:2197-217. [PMID: 23202460 PMCID: PMC3497048 DOI: 10.3390/v4102197] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Revised: 10/02/2012] [Accepted: 10/10/2012] [Indexed: 12/18/2022] Open
Abstract
Hepatitis C is a major global health burden with an estimated 160 million infected individuals worldwide. This long-term disease evolves slowly, often leading to chronicity and potentially to liver failure. There is no anti-HCV vaccine, and, until recently, the only treatment available, based on pegylated interferon and ribavirin, was partially effective, and had considerable side effects. With recent advances in the understanding of the HCV life cycle, the development of promising direct acting antivirals (DAAs) has been achieved. Their use in combination with the current treatment has led to encouraging results for HCV genotype 1 patients. However, this therapy is quite expensive and will probably not be accessible for all patients worldwide. For this reason, constant efforts are being made to identify new antiviral molecules. Recent reports about natural compounds highlight their antiviral activity against HCV. Here, we aim to review the natural molecules that interfere with the HCV life cycle and discuss their potential use in HCV therapy.
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Affiliation(s)
- Noémie Calland
- Inserm U1019, CNRS UMR8204, Center for Infection & Immunity of Lille, Institut Pasteur de Lille, Université Lille Nord de France, Lille, France.
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Bojic LA, Sawyez CG, Telford DE, Edwards JY, Hegele RA, Huff MW. Activation of peroxisome proliferator-activated receptor δ inhibits human macrophage foam cell formation and the inflammatory response induced by very low-density lipoprotein. Arterioscler Thromb Vasc Biol 2012; 32:2919-28. [PMID: 23023367 DOI: 10.1161/atvbaha.112.255208] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
OBJECTIVE Hypertriglyceridemia is an important risk factor for cardiovascular disease. Elevated plasma very low-density lipoprotein (VLDL) puts insulin-resistant patients at risk for atherosclerosis. VLDL readily induces macrophage lipid accumulation and inflammatory responses, for which targeted therapeutic strategies remain elusive. We examined the ability of VLDL to induce macrophage foam cells and the inflammatory response and sought to define the cell signaling cascades involved. We further examined the potential of peroxisome proliferator-activated receptor (PPAR) δ activation to attenuate both VLDL-stimulated lipid accumulation and cytokine expression. METHODS AND RESULTS THP-1 macrophages exposed to VLDL displayed significant triglyceride accumulation, which was attenuated by PPARδ activation. PPARδ agonists stimulated a transcriptional program resulting in inhibition of lipoprotein lipase activity, activation of fatty acid uptake, and enhanced β-oxidation. VLDL-treated macrophages significantly increased the expression of activator protein 1 associated cytokines interleukin-1β, macrophage inflammatory protein 1α, and intercellular adhesion molecule-1. VLDL treatment significantly increased the phosphorylation of both extracellular signal-related kinase 1 and 2 and p38. VLDL reduced AKT phosphorylation as well as its downstream effector forkhead box protein O1, concomitant with increased nuclear forkhead box protein O1. Cells treated with PPARδ agonists were completely resistant to VLDL-induced expression of inflammatory cytokines, mediated by normalization of mitogen-activated protein kinase (MAPK)(erk) and AKT/forkhead box protein O1 signaling. CONCLUSIONS The combined PPARδ-mediated reductions of lipid accumulation and inflammatory cytokine expression suggest a novel macrophage-targeted therapeutic option in treating atherosclerosis.
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Affiliation(s)
- Lazar A Bojic
- Vascular Biology, Robarts Research Institute, Department of Biochemistry, The University of Western Ontario, London, Ontario, Canada
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Chanet A, Milenkovic D, Manach C, Mazur A, Morand C. Citrus flavanones: what is their role in cardiovascular protection? JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2012; 60:8809-22. [PMID: 22574825 DOI: 10.1021/jf300669s] [Citation(s) in RCA: 127] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Flavanones, including hesperidin and naringin, are polyphenolic compounds highly and almost exclusively present in citrus. Epidemiological studies reported an inverse relationship between their intake and the risk of cardiovascular diseases. Clinical and experimental data further showed their antihypertensive, lipid-lowering, insulin-sensitizing, antioxidative, and anti-inflammatory properties, which could explain their antiatherogenic action in animal models. Although flavanones may be promising compounds that are particularly active in cardiovascular disease prevention, clinical data are still scarce and most in vitro data have been obtained under nonphysiologically relevant conditions. Moreover, the mechanisms responsible for flavanone action are not fully elucidated. Therefore, further research is needed to better evaluate and understand the protective effects of flavanones in cardiovascular diseases.
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Affiliation(s)
- Audrey Chanet
- INRA , UMR 1019, UNH, CRNH Auvergne, F-63000 Clermont-Ferrand, France
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Harbrecht BG, Nweze I, Smith JW, Zhang B. Insulin inhibits hepatocyte iNOS expression induced by cytokines by an Akt-dependent mechanism. Am J Physiol Gastrointest Liver Physiol 2012; 302:G116-22. [PMID: 22038823 PMCID: PMC3345958 DOI: 10.1152/ajpgi.00114.2011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Hepatocyte inducible nitric oxide synthese (iNOS) expression is a tightly controlled pathway that mediates hepatic inflammation and hepatocyte injury in a variety of disease states. We have shown that cyclic adenosine monophosphate (cAMP) regulates cytokine-induced hepatocyte iNOS expression through mechanisms that involve protein kinase B/Akt. We hypothesized that insulin, which activates Akt signaling in hepatocytes, as well as signaling through p38 and MAPK p42/p44, would regulate iNOS expression during inflammation. In primary rat hepatocytes, insulin inhibited cytokine-stimulated nitrite accumulation and iNOS expression in a dose-dependent manner. Inhibition of MAPK p42/p44 with PD98059 had no effect on iNOS activation, whereas SB203580 to block p38 reversed insulin's inhibitory effect. However, insulin did not increase p38 activation and inhibition of p38 signaling with a dominant negative p38 plasmid had no effect on cytokine- or insulin-mediated effects on iNOS. We found that SB203580 blocked insulin-induced Akt activation. Inhibition of Akt signaling with LY294002 or a dominant negative Akt plasmid increased cytokine-stimulated nitrite production and iNOS protein expression and blocked the inhibitory effects of insulin. NF-κB induces iNOS expression and can be regulated by Akt, but insulin had no effect on cytokine-mediated IκBα levels or NF-κB p65 translocation. Our data demonstrate that insulin inhibits cytokine-stimulated hepatocyte iNOS expression and does so through effects on Akt-mediated signaling.
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Affiliation(s)
- Brian G. Harbrecht
- Department of Surgery and the Price Institute for Surgical Research, University of Louisville School of Medicine, Louisville, Kentucky
| | - Ikenna Nweze
- Department of Surgery and the Price Institute for Surgical Research, University of Louisville School of Medicine, Louisville, Kentucky
| | - Jason W. Smith
- Department of Surgery and the Price Institute for Surgical Research, University of Louisville School of Medicine, Louisville, Kentucky
| | - Baochun Zhang
- Department of Surgery and the Price Institute for Surgical Research, University of Louisville School of Medicine, Louisville, Kentucky
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42
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Moon BC, Hernandez-Ono A, Stiles B, Wu H, Ginsberg HN. Apolipoprotein B secretion is regulated by hepatic triglyceride, and not insulin, in a model of increased hepatic insulin signaling. Arterioscler Thromb Vasc Biol 2011; 32:236-46. [PMID: 22155452 DOI: 10.1161/atvbaha.111.241356] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
OBJECTIVE States of insulin resistance, hyperinsulinemia, and hepatic steatosis are associated with increased secretion of triglycerides (TG) and apolipoprotein B (apoB), even though insulin targets apoB for degradation. We used hepatic-specific "phosphatase and tensin homologue deleted on chromosome 10" (Pten) knockout (hPten-ko) mice, with increased hepatic insulin signaling, to determine the relative roles of insulin signaling and hepatic TG in regulating apoB secretion. METHODS AND RESULTS TG and apoB secretion was elevated in hPten-ko mice. When hepatic TG was reduced by inhibition of diacylglycerol acyltransferase 1/diacylglycerol acyltransferase 2 or sterol regulatory element-binding protein-1c, both TG secretion and apoB secretion fell without changes in hepatic insulin signaling. Acute reconstitution of hPten reduced hepatic TG content, and both TG and apoB secretion fell within 4 days despite decreased hepatic insulin signaling. Acute depletion of hepatic Pten by adenoviral introduction of Cre into Pten floxed mice caused steatosis within 4 days, and secretion of both TG and apoB increased despite increased hepatic insulin signaling. Even when steatosis after acute Pten depletion was prevented by pretreatment with SREBP-1c antisense oligonucleotides, apoB secretion was not reduced after 4 days. Ex vivo results were in primary hepatocytes were similar. CONCLUSIONS Either hepatic TG is the dominant regulator of apoB secretion or any inhibitory effects of hepatic insulin signaling on apoB secretion is very short-lived.
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Affiliation(s)
- Byoung C Moon
- Irving Institute for Clinical and Translational Research, PH10-305, Columbia University, 630 West 168th Street, New York, NY 10032, USA
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43
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Goldwasser J, Cohen PY, Lin W, Kitsberg D, Balaguer P, Polyak SJ, Chung RT, Yarmush ML, Nahmias Y. Naringenin inhibits the assembly and long-term production of infectious hepatitis C virus particles through a PPAR-mediated mechanism. J Hepatol 2011; 55:963-71. [PMID: 21354229 PMCID: PMC3197749 DOI: 10.1016/j.jhep.2011.02.011] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2010] [Revised: 02/01/2011] [Accepted: 02/11/2011] [Indexed: 12/24/2022]
Abstract
BACKGROUND & AIMS Hepatitis C virus (HCV) infection affects 3% of the world population and is the leading cause of chronic liver disease worldwide. Current standard of care is effective in only 50% of the patients, poorly tolerated, and associated with significant side effects and viral resistance. Recently, our group and others demonstrated that the HCV lifecycle is critically dependent on host lipid metabolism and that its production is metabolically modulated. METHODS The JFH1/Huh7.5.1 full lifecycle model of HCV was used to study the antiviral effects of naringenin on viral replication, assembly, and production. Activation of PPARα was elucidated using GAL4-PPARα fusion reporters, PPRE reporters, qRT-PCR, and metabolic studies. Metabolic results were confirmed in primary human hepatocytes. RESULTS We demonstrate that the grapefruit flavonoid naringenin dose-dependently inhibits HCV production without affecting intracellular levels of the viral RNA or protein. We show that naringenin blocks the assembly of intracellular infectious viral particles, upstream of viral egress. This antiviral effect is mediated in part by the activation of PPARα, leading to a decrease in VLDL production without causing hepatic lipid accumulation in Huh7.5.1 cells and primary human hepatocytes. Long-term treatment with naringenin leads to a rapid 1.4 log reduction in HCV, similar to 1000U of interferon. During the washout period, HCV levels returned to normal, consistent with our proposed mechanism of action. CONCLUSIONS The data demonstrates that naringenin is a non-toxic assembly inhibitor of HCV and that other PPARα agonists play a similar role in blocking viral production. The combination of naringenin with STAT-C agents could potentially bring a rapid reduction in HCV levels during the early treatment phase, an outcome associated with sustained virological response.
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Affiliation(s)
- Jonathan Goldwasser
- Center for Engineering in Medicine, Shriners Burns Hospital, Boston, MA, USA,Harvard-MIT Division of Health Science and Technology, Cambridge, MA, USA,Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Pazit Y. Cohen
- The Selim and Rachel Benin School of Engineering, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Wenyu Lin
- Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Danny Kitsberg
- The Selim and Rachel Benin School of Engineering, The Hebrew University of Jerusalem, Jerusalem, Israel
| | | | | | - Raymond T. Chung
- Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Martin L. Yarmush
- Center for Engineering in Medicine, Shriners Burns Hospital, Boston, MA, USA,Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Yaakov Nahmias
- Center for Engineering in Medicine, Shriners Burns Hospital, Boston, MA, USA,Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA,The Selim and Rachel Benin School of Engineering, The Hebrew University of Jerusalem, Jerusalem, Israel,Corresponding author. Address: The Selim and Rachel Benin School of Engineering, The Hebrew University of Jerusalem, Jerusalem, Israel. Tel.: +972 2 658 4406; fax: +972 2 658 5261. , (Y. Nahmias)
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44
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Choi SH, Ginsberg HN. Increased very low density lipoprotein (VLDL) secretion, hepatic steatosis, and insulin resistance. Trends Endocrinol Metab 2011; 22:353-63. [PMID: 21616678 PMCID: PMC3163828 DOI: 10.1016/j.tem.2011.04.007] [Citation(s) in RCA: 254] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2011] [Revised: 04/18/2011] [Accepted: 04/19/2011] [Indexed: 12/14/2022]
Abstract
Insulin resistance (IR) affects not only the regulation of carbohydrate metabolism but all aspects of lipid and lipoprotein metabolism. IR is associated with increased secretion of VLDL and increased plasma triglycerides, as well as with hepatic steatosis, despite the increased VLDL secretion. Here we link IR with increased VLDL secretion and hepatic steatosis at both the physiologic and molecular levels. Increased VLDL secretion, together with the downstream effects on high density lipoprotein (HDL) cholesterol and low density lipoprotein (LDL) size, is proatherogenic. Hepatic steatosis is a risk factor for steatohepatitis and cirrhosis. Understanding the complex inter-relationships between IR and these abnormalities of liver lipid homeostasis will provide insights relevant to new therapies for these increasing clinical problems.
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Affiliation(s)
- Sung Hee Choi
- Internal Medicine, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seoul, Korea
| | - Henry N Ginsberg
- Columbia University College of Physicians and Surgeons, New York, NY, USA
- whom correspondence should be addressed.
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45
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Hussain MM, Nijstad N, Franceschini L. Regulation of microsomal triglyceride transfer protein. ACTA ACUST UNITED AC 2011; 6:293-303. [PMID: 21808658 DOI: 10.2217/clp.11.21] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Microsomal triglyceride transfer protein (MTP) facilitates the transport of dietary and endogenous fat by the intestine and liver by assisting in the assembly and secretion of triglyceride-rich apolipoprotein B-containing lipoproteins. Higher concentrations of apolipoprotein B lipoproteins predispose individuals to various cardiovascular and metabolic diseases such as atherosclerosis, diabetes, obesity and the metabolic syndrome. These can potentially be avoided by reducing MTP activity. In this article, we discuss regulation of MTP during development, cellular differentiation and diurnal variation. Furthermore, we focus on the regulation of MTP that occurs at transcriptional, post-transcriptional and post-translational levels. Transcriptional regulation of MTP depends on a few highly conserved cis-elements in the promoter. Several transcription factors that bind to these elements and either increase or decrease MTP expression have been identified. Additionally, MTP is regulated by macronutrients, hormones and other factors. This article will address the many ways in which MTP is regulated and advance the idea that reducing MTP levels, rather than its inhibition, might be an option to lower plasma lipids.
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Affiliation(s)
- M Mahmood Hussain
- Departments of Cell Biology and Pediatrics, The State University of New York, Downstate Medical Center, 450 Clarkson Ave, Brooklyn, NY 11203, USA
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46
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Lin Y, Vermeer MA, Bos W, van Buren L, Schuurbiers E, Miret-Catalan S, Trautwein EA. Molecular structures of citrus flavonoids determine their effects on lipid metabolism in HepG2 cells by primarily suppressing apoB secretion. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2011; 59:4496-4503. [PMID: 21425871 DOI: 10.1021/jf1044475] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
This study investigated the underlying mechanisms of action for blood lipid lowering effects of citrus flavonoids and their methoxylated analogues (n = 19; dose range: 0-100 μM) in HepG2 cells. Cholesterol (CH) and triglyceride (TG) syntheses were assessed by measuring the incorporation of (14)C-acetate and (14)C-glycerol, respectively, whereas apoB secretion was determined by ELISA. Results show that two polymethoxylated citrus flavonoids (PMFs), tangeretin and nobiletin, potently inhibited apoB secretion (IC(50) = 13 and 29 μM, respectively) and modestly inhibited CH synthesis (IC(50) = 49 and 68 μM) and TG synthesis (IC(50) = 14 and 73 μM), without effecting LDL-receptor activity. Other PMFs (e.g., sinensetin) and non-PMFs (e.g., hesperetin and naringenin) had only weak effects on CH and TG syntheses and apoB secretion (IC(50) > 100 μM). The structure-activity analysis indicated that a fully methoxylated A-ring of the flavonoid structure was associated with a potent inhibitory activity on hepatic apoB secretion. In conclusion, this study using HepG2 cells indicates that citrus flavonoids with a fully methoxylated A-ring may lower blood CH and TG concentrations primarily by suppressing hepatic apoB secretion as a main underlying mode of action.
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Affiliation(s)
- Yuguang Lin
- Unilever R&D Vlaardingen, Vlaardingen, The Netherlands.
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47
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Mulvihill EE, Assini JM, Lee JK, Allister EM, Sutherland BG, Koppes JB, Sawyez CG, Edwards JY, Telford DE, Charbonneau A, St-Pierre P, Marette A, Huff MW. Nobiletin attenuates VLDL overproduction, dyslipidemia, and atherosclerosis in mice with diet-induced insulin resistance. Diabetes 2011; 60:1446-57. [PMID: 21471511 PMCID: PMC3292317 DOI: 10.2337/db10-0589] [Citation(s) in RCA: 143] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVE Increased plasma concentrations of apolipoprotein B100 often present in patients with insulin resistance and confer increased risk for the development of atherosclerosis. Naturally occurring polyphenolic compounds including flavonoids have antiatherogenic properties. The aim of the current study was to evaluate the effect of the polymethoxylated flavonoid nobiletin on lipoprotein secretion in cultured human hepatoma cells (HepG2) and in a mouse model of insulin resistance and atherosclerosis. RESEARCH DESIGN AND METHODS Lipoprotein secretion was determined in HepG2 cells incubated with nobiletin or insulin. mRNA abundance was evaluated by quantitative real-time PCR, and Western blotting was used to demonstrate activation of cell signaling pathways. In LDL receptor-deficient mice (Ldlr(-/-)) fed a Western diet supplemented with nobiletin, metabolic parameters, gene expression, fatty acid oxidation, glucose homeostasis, and energy expenditure were documented. Atherosclerosis was quantitated by histological analysis. RESULTS In HepG2 cells, activation of mitogen-activated protein kinase-extracellular signal-related kinase signaling by nobiletin or insulin increased LDLR and decreased MTP and DGAT1/2 mRNA, resulting in marked inhibition of apoB100 secretion. Nobiletin, unlike insulin, did not induce phosphorylation of the insulin receptor or insulin receptor substrate-1 and did not stimulate lipogenesis. In fat-fed Ldlr(-/-) mice, nobiletin attenuated dyslipidemia through a reduction in VLDL-triglyceride (TG) secretion. Nobiletin prevented hepatic TG accumulation, increased expression of Pgc1α and Cpt1α, and enhanced fatty acid β-oxidation. Nobiletin did not activate any peroxisome proliferator-activated receptor (PPAR), indicating that the metabolic effects were PPAR independent. Nobiletin increased hepatic and peripheral insulin sensitivity and glucose tolerance and dramatically attenuated atherosclerosis in the aortic sinus. CONCLUSIONS Nobiletin provides insight into treatments for dyslipidemia and atherosclerosis associated with insulin-resistant states.
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Affiliation(s)
- Erin E. Mulvihill
- Vascular Biology, Robarts Research Institute, London, Ontario, Canada
- Department of Biochemistry, The University of Western Ontario, London, Ontario, Canada
| | - Julia M. Assini
- Vascular Biology, Robarts Research Institute, London, Ontario, Canada
- Department of Biochemistry, The University of Western Ontario, London, Ontario, Canada
| | - Justin K. Lee
- Vascular Biology, Robarts Research Institute, London, Ontario, Canada
| | - Emma M. Allister
- Vascular Biology, Robarts Research Institute, London, Ontario, Canada
| | | | - Julie B. Koppes
- Vascular Biology, Robarts Research Institute, London, Ontario, Canada
| | - Cynthia G. Sawyez
- Vascular Biology, Robarts Research Institute, London, Ontario, Canada
- Department of Medicine, The University of Western Ontario, London, Ontario, Canada
| | - Jane Y. Edwards
- Vascular Biology, Robarts Research Institute, London, Ontario, Canada
- Department of Medicine, The University of Western Ontario, London, Ontario, Canada
| | - Dawn E. Telford
- Vascular Biology, Robarts Research Institute, London, Ontario, Canada
- Department of Medicine, The University of Western Ontario, London, Ontario, Canada
| | | | | | - André Marette
- Department of Medicine, Laval University, Quebec City, Quebec, Canada
| | - Murray W. Huff
- Vascular Biology, Robarts Research Institute, London, Ontario, Canada
- Department of Biochemistry, The University of Western Ontario, London, Ontario, Canada
- Department of Medicine, The University of Western Ontario, London, Ontario, Canada
- Corresponding author: Murray W. Huff,
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48
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Rizza S, Muniyappa R, Iantorno M, Kim JA, Chen H, Pullikotil P, Senese N, Tesauro M, Lauro D, Cardillo C, Quon MJ. Citrus polyphenol hesperidin stimulates production of nitric oxide in endothelial cells while improving endothelial function and reducing inflammatory markers in patients with metabolic syndrome. J Clin Endocrinol Metab 2011; 96:E782-92. [PMID: 21346065 PMCID: PMC3085197 DOI: 10.1210/jc.2010-2879] [Citation(s) in RCA: 196] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
CONTEXT Hesperidin, a citrus flavonoid, and its metabolite hesperetin may have vascular actions relevant to their health benefits. Molecular and physiological mechanisms of hesperetin actions are unknown. OBJECTIVE We tested whether hesperetin stimulates production of nitric oxide (NO) from vascular endothelium and evaluated endothelial function in subjects with metabolic syndrome on oral hesperidin therapy. DESIGN, SETTING, AND INTERVENTIONS: Cellular mechanisms of action of hesperetin were evaluated in bovine aortic endothelial cells (BAEC) in primary culture. A randomized, placebo-controlled, double-blind, crossover trial examined whether oral hesperidin administration (500 mg once daily for 3 wk) improves endothelial function in individuals with metabolic syndrome (n = 24). MAIN OUTCOME MEASURE We measured the difference in brachial artery flow-mediated dilation between placebo and hesperidin treatment periods. RESULTS Treatment of BAEC with hesperetin acutely stimulated phosphorylation of Src, Akt, AMP kinase, and endothelial NO synthase to produce NO; this required generation of H(2)O(2). Increased adhesion of monocytes to BAEC and expression of vascular cell adhesion molecule-1 in response to TNF-α treatment was reduced by pretreatment with hesperetin. In the clinical study, when compared with placebo, hesperidin treatment increased flow-mediated dilation (10.26 ± 1.19 vs. 7.78 ± 0.76%; P = 0.02) and reduced concentrations of circulating inflammatory biomarkers (high-sensitivity C-reactive protein, serum amyloid A protein, soluble E-selectin). CONCLUSIONS Novel mechanisms for hesperetin action in endothelial cells inform effects of oral hesperidin treatment to improve endothelial dysfunction and reduce circulating markers of inflammation in our exploratory clinical trial. Hesperetin has vasculoprotective actions that may explain beneficial cardiovascular effects of citrus consumption.
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Affiliation(s)
- Stefano Rizza
- Department of Internal Medicine, University of Rome Tor Vergata, 00133 Rome, Italy
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Shulman M, Cohen M, Soto-Gutierrez A, Yagi H, Wang H, Goldwasser J, Lee-Parsons CW, Benny-Ratsaby O, Yarmush ML, Nahmias Y. Enhancement of naringenin bioavailability by complexation with hydroxypropyl-β-cyclodextrin. [corrected]. PLoS One 2011; 6:e18033. [PMID: 21494673 PMCID: PMC3071816 DOI: 10.1371/journal.pone.0018033] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2010] [Accepted: 02/23/2011] [Indexed: 11/26/2022] Open
Abstract
The abundant flavonoid aglycone, naringenin, which is responsible for the bitter taste in grapefruits, has been shown to possess hypolipidemic and anti-inflammatory effects both in vitro and in vivo. Recently, our group demonstrated that naringenin inhibits hepatitis C virus (HCV) production, while others demonstrated its potential in the treatment of hyperlipidemia and diabetes. However, naringenin suffers from low oral bioavailability critically limiting its clinical potential. In this study, we demonstrate that the solubility of naringenin is enhanced by complexation with β-cyclodextrin, an FDA approved excipient. Hydroxypropoyl-β-cyclodextrin (HPβCD), specifically, increased the solubility of naringenin by over 400-fold, and its transport across a Caco-2 model of the gut epithelium by 11-fold. Complexation of naringenin with HPβCD increased its plasma concentrations when fed to rats, with AUC values increasing by 7.4-fold and C(max) increasing 14.6-fold. Moreover, when the complex was administered just prior to a meal it decreased VLDL levels by 42% and increased the rate of glucose clearance by 64% compared to naringenin alone. These effects correlated with increased expression of the PPAR co-activator, PGC1α in both liver and skeletal muscle. Histology and blood chemistry analysis indicated this route of administration was not associated with damage to the intestine, kidney, or liver. These results suggest that the complexation of naringenin with HPβCD is a viable option for the oral delivery of naringenin as a therapeutic entity with applications in the treatment of dyslipidemia, diabetes, and HCV infection.
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Affiliation(s)
- Maria Shulman
- Center for Bioengineering, School of Computer Science & Engineering, Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Merav Cohen
- Center for Bioengineering, School of Computer Science & Engineering, Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Alejandro Soto-Gutierrez
- Center for Engineering in Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Hiroshi Yagi
- Center for Engineering in Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Hongyun Wang
- Center for Engineering in Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Jonathan Goldwasser
- Center for Engineering in Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
- Harvard-MIT Division of Health Science and Technology, Cambridge, Massachusetts, United States of America
| | - Carolyn W. Lee-Parsons
- Department of Chemical Engineering, Northeastern University, Boston, Massachusetts, United States of America
| | - Ofra Benny-Ratsaby
- Children's Hospital Boston, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Martin L. Yarmush
- Center for Engineering in Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
- Department of Biomedical Engineering, Rutgers University, Piscataway, New Jersey, United States of America
| | - Yaakov Nahmias
- Center for Bioengineering, School of Computer Science & Engineering, Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
- Center for Engineering in Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
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50
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Nichols LA, Jackson DE, Manthey JA, Shukla SD, Holland LJ. Citrus flavonoids repress the mRNA for stearoyl-CoA desaturase, a key enzyme in lipid synthesis and obesity control, in rat primary hepatocytes. Lipids Health Dis 2011; 10:36. [PMID: 21345233 PMCID: PMC3056818 DOI: 10.1186/1476-511x-10-36] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2010] [Accepted: 02/23/2011] [Indexed: 01/25/2023] Open
Abstract
Citrus flavonoids have been shown to decrease plasma lipid levels, improve glucose tolerance, and attenuate obesity. One possible mechanism underlying these physiological effects is reduction of hepatic levels of the mRNA for stearoyl-CoA desaturase-1 (SCD1), since repression of this enzyme reduces hyperlipidemia and adiposity. Here, we show that citrus flavonoids of two structural classes reduce SCD1 mRNA concentrations in a dose-dependent manner in rat primary hepatocytes. This is the first demonstration of repression of SCD1 by citrus flavonoids, either in vivo or in cultured cells. Furthermore, it is the first use of freshly-isolated hepatocytes from any animal to examine citrus flavonoid action at the mRNA level. This study demonstrates that regulation of SCD1 gene expression may play a role in control of obesity by citrus flavonoids and that rat primary hepatocytes are a physiologically-relevant model system for analyzing the molecular mechanisms of flavonoid action in the liver.
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Affiliation(s)
- Lanita A Nichols
- Department of Medical Pharmacology and Physiology, University of Missouri School of Medicine, Columbia, Missouri 65212, USA
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