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Bouwman LMS, Nieuwenhuizen AG, Swarts HJM, Piga R, van Schothorst EM, Keijer J. Metabolic effects of the dietary monosaccharides fructose, fructose-glucose, or glucose in mice fed a starch-containing moderate high-fat diet. Physiol Rep 2020; 8:e14350. [PMID: 32026655 PMCID: PMC7002529 DOI: 10.14814/phy2.14350] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Fructose consumption has been linked to obesity and increased hepatic de novo lipogenesis (DNL). Excessive caloric intake often confounds the results of fructose studies, and experimental diets are generally low-fat diets, not representative for westernized diets. Here, we compared the effects of dietary fructose with those of dietary glucose, in adult male and female mice on a starch-containing moderate high-fat (HF) diet. After 5 weeks fattening on a HF high-glucose (HF-G) diet, mice were stratified per sex and assigned to one of the three intervention diets for 6 weeks: HF high fructose (HF-F), HF with equimolar glucose and fructose (HF-GF), or HF-G. Bodyweight (BW) and food intake were measured weekly. Indirect calorimetry was performed on week 5; animals were sacrificed in food-deprived state on week 6. Data were analyzed within sex. BW gain was similar among animals on the HF-G, HF-GF, and HF-F diets. Cumulative food intake was slightly lower in HF-F animals (both sexes). However, energy expenditure was not affected, or were circulating insulin and glucose concentrations, and hepatic triglyceride levels at endpoint. Hepatic gene expression analysis showed only minor alterations in hexokinase and glycolysis-related expression in males, and no alterations in sugar transporters, or DNL-related enzymes. In females, no consistent alterations in hepatic or small intestine gene expression were seen. Concluding, partial or complete replacement of dietary glucose with fructose does not increase caloric intake, and does not affect BW, hepatic triglyceride levels, or insulin concentrations in male and female mice on a moderate high-fat diet.
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Affiliation(s)
| | | | - Hans J. M. Swarts
- Human and Animal PhysiologyWageningen UniversityWageningenThe Netherlands
| | - Rosaria Piga
- Human and Animal PhysiologyWageningen UniversityWageningenThe Netherlands
| | | | - Jaap Keijer
- Human and Animal PhysiologyWageningen UniversityWageningenThe Netherlands
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Ferrando ML, van Baarlen P, Orrù G, Piga R, Bongers RS, Wels M, De Greeff A, Smith HE, Wells JM. Carbohydrate availability regulates virulence gene expression in Streptococcus suis. PLoS One 2014; 9:e89334. [PMID: 24642967 PMCID: PMC3958366 DOI: 10.1371/journal.pone.0089334] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Accepted: 01/17/2014] [Indexed: 12/04/2022] Open
Abstract
Streptococcus suis is a major bacterial pathogen of young pigs causing worldwide economic problems for the pig industry. S. suis is also an emerging pathogen of humans. Colonization of porcine oropharynx by S. suis is considered to be a high risk factor for invasive disease. In the oropharyngeal cavity, where glucose is rapidly absorbed but dietary α-glucans persist, there is a profound effect of carbohydrate availability on the expression of virulence genes. Nineteen predicted or confirmed S. suis virulence genes that promote adhesion to and invasion of epithelial cells were expressed at higher levels when S. suis was supplied with the α-glucan starch/pullulan compared to glucose as the single carbon source. Additionally the production of suilysin, a toxin that damages epithelial cells, was increased more than ten-fold when glucose levels were low and S. suis was growing on pullulan. Based on biochemical, bioinformatics and in vitro and in vivo gene expression studies, we developed a biological model that postulates the effect of carbon catabolite repression on expression of virulence genes in the mucosa, organs and blood. This research increases our understanding of S. suis virulence mechanisms and has important implications for the design of future control strategies including the development of anti-infective strategies by modulating animal feed composition.
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Affiliation(s)
- M. Laura Ferrando
- Host-Microbe Interactomics, Animal Sciences, Wageningen University, Wageningen, The Netherlands
- Department of Medical Microbiology, Academic Medical Center, Amsterdam, The Netherlands
| | - Peter van Baarlen
- Host-Microbe Interactomics, Animal Sciences, Wageningen University, Wageningen, The Netherlands
| | - Germano Orrù
- Oral Biotechnology Laboratory, University of Cagliari, Cagliari, Italy
| | - Rosaria Piga
- Host-Microbe Interactomics, Animal Sciences, Wageningen University, Wageningen, The Netherlands
| | | | | | - Astrid De Greeff
- Central Veterinary Institute, Animal Sciences Group, Wageningen University, Lelystad, The Netherlands
| | - Hilde E. Smith
- Central Veterinary Institute, Animal Sciences Group, Wageningen University, Lelystad, The Netherlands
| | - Jerry M. Wells
- Host-Microbe Interactomics, Animal Sciences, Wageningen University, Wageningen, The Netherlands
- * E-mail:
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Arcadu B, Orrù M, Piga R, Orrù G. Designing of sequencing assay assisted by capillary electrophoresis based on DNA folding analysis: an application to the VCAM1 gene. Electrophoresis 2012; 33:1215-9. [PMID: 22539325 DOI: 10.1002/elps.201100590] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
In this work, we describe a fast standardized molecular method for DNA sequencing assisted by capillary electrophoresis with a particular emphasis on bioinformatic approaches to avoid sequencing errors due to complex DNA regions. In this case, the method was applied on the human vascular adhesion molecule 1 (VCAM1) gene. VCAM1 sequence, in fact, shows many thermodynamically critical parameters such as very low GC content (30-40%), many nucleotide stack areas, i.e. hairpins, self-complementary regions. With a traditional primer design approach it was difficult to design correct PCR oligonucleotides, thus sometimes, the chromatogram showed an illegible profile. By a strategy involving various bioinformatic tools (Mfold, Oligo, Highter), we investigated the role of the DNA-folding analysis in the assistance of primer design for the DNA sequencing of fragments with high -ΔG stem-loop regions. This new approach allowed us to sequence nine different VCAM1 regions each containing the respective exon. Our results, based on different DNA samples recruited from oral brushes taken from ten different subjects, identified four different SNPs (c.662-7C/T, c.1793-79A>G, c.2079C/T, c.2208A>G) with high reproducibility.
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Denotti G, Piga R, Montaldo C, Erriu M, Pilia F, Piras A, Luca MD, Orrù G. In Vitro evaluation of Enterococcus faecalis adhesion on various endodontic medicaments. Open Dent J 2009; 3:120-4. [PMID: 19557151 PMCID: PMC2701317 DOI: 10.2174/1874210600903010120] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2008] [Revised: 01/12/2009] [Accepted: 04/03/2009] [Indexed: 11/22/2022] Open
Abstract
E. faecalis in endodontic infection represents a biofilm type of disease, which explains the bacteria's resistance to various antimicrobial compounds and the subsequent failure after endodontic treatment. The purpose of this study was to compare antimicrobial activities and bacteria kinetic adhesion in vitro for three endodontic medicaments with a clinical isolate of E. faecalis. We devised a shake culture which contained the following intracanalar preparations: CPD, Endoidrox (EIX), PulpCanalSealer (PCS); these were immersed in a liquid culture medium inoculated with the microorganism. The shake system velocity was able to prevent non-specific bacteria adhesion and simulated the salivary flow. Specimens were collected daily (from both the medium and medicaments) for 10 days; the viable cells were counted by plate count, while the adhesion index AI ° [E. faecalis fg DNA] /mm² was evaluated in the pastes after DNA extraction, by quantitative real time PCR for the 16S rRNA gene. A partial growth inhibition, during the first 24 hours, was observed in the liquid medium and on the medicaments for EIX and subsequently for CPD (six logs). EIX showed the lowest adhesion coefficient (5*10² [fg DNA]/mm²) for nine days and was similar to the control. PCS showed no antimicrobial/antibiofilm properties. This showed that "calcium oxide" base compounds could be active against biofilm progression and at least in the short term (2-4 days) on E. faecalis cells growing in planktonic cultures.
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Affiliation(s)
- Gloria Denotti
- Oral Biotechnology Laboratory (OBL), Dipartimento di Chirurgia e Scienze Odontostomatologiche, Universita' Degli Studi di Cagliari, Cagliari, Italy
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Piga R, Micheletto R, Kawakami Y. Acoustical nanometre-scale vibrations of live cells detected by a near-field optical setup. Opt Express 2007; 15:5589-5594. [PMID: 19532815 DOI: 10.1364/oe.15.005589] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The Scanning Near-field Optical Microscope (SNOM) is able to detect tiny vertical movement on the cell membrane in the range of only 1 nanometer or less, about 3 orders of magnitude better than conventional optical microscopes. Here we show intriguing data of cell membrane nanometer-scale dynamics associated to different phenomena of the cell's The Scanning Near-field Optical Microscope (SNOM) is able to detect tiny vertical movement on the cell membrane in the range of only 1 nanometer or less, about 3 orders of magnitude better than conventional optical microscopes. Here we show intriguing data of cell membrane nanometer-scale dynamics associated to different phenomena of the cell's life, such as cell cycle and cell death, on rat pheochromocytoma line PC12. Working in culture medium with alive and unperturbed samples, we could detect nanometer-sized movements; Fourier components revealed a clear distinct behavior associated to regulation of neurite outgrowth and changes on morphology after necrotic stimulus.
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Piga R, Naito Y, Kokura S, Handa O, Yoshikawa T. Short-term high glucose exposure induces monocyte-endothelial cells adhesion and transmigration by increasing VCAM-1 and MCP-1 expression in human aortic endothelial cells. Atherosclerosis 2006; 193:328-34. [PMID: 17097661 DOI: 10.1016/j.atherosclerosis.2006.09.016] [Citation(s) in RCA: 124] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2006] [Revised: 08/12/2006] [Accepted: 09/19/2006] [Indexed: 01/31/2023]
Abstract
Acute, short-term hyperglycemia is becoming recognized as an important risk factor for several diseases. In the present study, using human aortic endothelial cells (HAECs), we investigated whether short-term high glucose exposure, either on the scale of hours, could enhance the monocyte adhesion and migration to the subendothelium via increasing expression of adhesion molecules and release of chemotactic factors. HAECs stimulated with 25mM d(+)glucose (HG) for not more than 12h, exhibited rapid up-regulation of vascular cell adhesion molecule-1 (VCAM-1) and monocyte chemoattractant protein-1 (MCP-1) mRNA and protein. Although intercellular adhesion molecule-1 (ICAM-1) is considered as a marker of the activation of the atherogenic process, early up-regulation was not observed, and VCAM-1 and MCP-1 protein enhance was sufficient to increase the adhesiveness of human monocytes U-937 to HAECs and their transmigration into the subendothelial space after 4h HG stimulation; both effects were prevented by interfering with monoclonal antibodies against VCAM-1, CD11b, and MCP-1. An increased intracellular oxidative stress, a translocation of NF-kappaB to the nucleus and a prevention of adhesion and transmigration of U-937 by interfering with NF-kappaB inhibitors was also observed after a short HG treatment. Taken together, these results suggest that either acute hyperglycemic spikes could exert an influence on the onset of diabetic complications and on the development of the atherogenic profile on diabetic and non-diabetic subjects.
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Affiliation(s)
- Rosaria Piga
- Department of Inflammation and Immunology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kamigyo-ku, Kyoto, Japan.
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Piga R, Saito Y, Yoshida Y, Niki E. Cytotoxic effects of various stressors on PC12 cells: involvement of oxidative stress and effect of antioxidants. Neurotoxicology 2006; 28:67-75. [PMID: 16942797 DOI: 10.1016/j.neuro.2006.07.006] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2005] [Revised: 05/14/2006] [Accepted: 07/16/2006] [Indexed: 02/06/2023]
Abstract
In order to specifically elucidate the involvement of oxidative stress, the effects of various types of stressors and antioxidants on PC12 cells were examined. In this study, the following four stressors were studied in detail: free radicals generated from 2,2'-azobis(2-amidinopropane) dihydrochloride (AAPH), 4-hydroxynonenal (HNE), 7-ketocholesterol (KC), and arsenic trioxide (As2O3). Undifferentiated PC12 cells were treated with 50% lethal concentration (LC50) of these stressors, and subsequently the viability, apoptosis/necrosis ratio, reactive oxygen species (ROS) production, caspase-3 activity, and protection by antioxidants were measured to elucidate the underlying mechanisms that determine the action of these stressors on PC12 cells. The cytotoxicity did not correlate directly with the intracellular formation of ROS. For example, as compared to AAPH, As2O3 produced considerably smaller amounts of ROS at LC50. As observed in the cells incubated with As2O3, KC and HNE exerted cell toxicity, but with a moderate production of ROS. With the exception of HNE, the apoptosis/necrosis ratio of all the stressors evaluated by annexin V and propidium iodide assays increased with an increase in the incubation time at the LC50 values of these stressors. In accordance with apoptosis ratio, caspase activity was detected in the cells incubated with AAPH, As2O3, and KC, but not HNE at LC50 for 24 h. The protective effect of alpha-tocopherol, 17beta-estradiol, 2,3-dihydro-5-hydroxy-2,2-dipentyl-4,6-di-tert-butylbenzofuran (BO653), glutathione, and N-acetylcysteine (NAC) against cytotoxicity depended on the type of stressors. These antioxidants were found to be effective against the abovementioned stressors, except As2O3 against which only NAC was effective. These results suggest that the involvement of ROS and the protective effect of antioxidants depend on the type of stressors.
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Affiliation(s)
- Rosaria Piga
- Human Stress Signal Research Center (HSSRC), National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
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Yoshida Y, Itoh N, Hayakawa M, Piga R, Cynshi O, Jishage KI, Niki E. Lipid peroxidation induced by carbon tetrachloride and its inhibition by antioxidant as evaluated by an oxidative stress marker, HODE. Toxicol Appl Pharmacol 2005; 208:87-97. [PMID: 16164964 DOI: 10.1016/j.taap.2005.01.015] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2004] [Revised: 01/17/2005] [Accepted: 01/29/2005] [Indexed: 11/26/2022]
Abstract
We have recently proposed total hydroxyoctadecadienoic acid (HODE) as a biomarker for oxidative stress in vivo. The biological samples such as plasma, urine, and tissues were first reduced and then saponified to convert the oxidation products of linoleate to HODE. In the present study, this method was applied to measure the oxidative damage induced by the administration of carbon tetrachloride to mice and also to evaluate the capacity of antioxidant to inhibit the above damage. alpha-Tocopherol transfer protein knock out (alpha-TTP-/-) mice were used to evaluate antioxidant effect in the absence of alpha-tocopherol. The intraperitoneal administration of carbon tetrachloride to mice induced the increase in HODE in liver and plasma, which was followed by an increase in plasma glutamic-oxaloacetic transaminase (GOT) and glutamic-pyruvic transaminase (GPT). F2-isoprostanes, another prevailing biomarker, were also increased similarly, but their concentration was approximately two to three orders of magnitude smaller than that of HODE. The lipophilic antioxidants such as gamma-tocopherol, gamma-tocotrienol and 2,3-dihydro-5-hydroxy-4,6-di-tert-butyl-2,2-dipentylbenzofuran (BO-653) were effective in suppressing the formation of HODE.
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Affiliation(s)
- Yasukazu Yoshida
- Human Stress Signal Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka Ikeda, Osaka 563-8577, Japan.
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Piga R, Micheletto R, Kawakami Y. Nano-probing of the membrane dynamics of rat pheochromocytoma by near-field optics. Biophys Chem 2005; 117:141-6. [PMID: 15923074 DOI: 10.1016/j.bpc.2005.04.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2005] [Revised: 04/21/2005] [Accepted: 04/21/2005] [Indexed: 11/25/2022]
Abstract
High-resolution analysis of activities of live cells is limited by the use of non-invasive methods. Apparatuses such as SEM, STM or AFM are not practicable because the necessary treatment or the harsh contact with system probe will disturb or destroy the cell. Optical methods are purely non-invasive, but they are usually diffraction limited and then their resolution is limited to approximately 1 microm. To overcome these restrictions, we introduce here the study of membrane activity of a live cell sample using a Scanning Near-field Optical Microscope (SNOM). A near field optical microscope is able to detect tiny vertical movement on the cell membrane in the range of only 1 nm or less, about 3 orders of magnitude better than conventional optical microscopes. It is a purely non-invasive, non-contact method, so the natural life activity of the sample is unperturbed. In this report, we demonstrated the nanometer-level resolving ability of our SNOM system analyzing cardiomyocytes samples of which membrane movement is known, and then we present new intriguing data of sharp 40 nm cell membrane sudden events on rat pheochromocytoma cell line PC12. All the measurements are carried out in culture medium with alive and unperturbed samples. We believe that this methodology will open a new approach to investigate live samples. The extreme sensitivity of SNOM allows measurements that are not possible with any other method on live biomaterial paving the way for a broad range of novel studies and applications.
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Affiliation(s)
- Rosaria Piga
- Human Stress Signal Research Center, Advanced Industrial Science and Technology, 1-8-31 Midorigaoka, 563-8577 Ikeda, Osaka, Japan.
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Piga R, Saito Y, Chen Z, Yoshida Y, Niki E. Characterization of monochloramine toxicity on PC12 cells and protective effect of tocopherol via antioxidative function. Arch Biochem Biophys 2005; 436:101-9. [PMID: 15752714 DOI: 10.1016/j.abb.2005.01.021] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2004] [Revised: 01/17/2005] [Indexed: 02/08/2023]
Abstract
Monochloramine (NH(2)Cl) is a physiological oxidant produced by activated neutrophils. In the present work, we studied the underlying mechanism of cytotoxic effects of NH(2)Cl on an undifferentiated rat pheochromocytoma PC12 cell line and the protective effects of antioxidants. The cells treated with 100 microM NH(2)Cl exhibited signs of apoptotic cell death such as phosphatidylserine exposure and caspase activation. To understand the mechanism of NH(2)Cl cytotoxicity, we examined the effect of various kinds of antioxidants including alpha-tocopherol (alpha-Toc) and beta-tocopherol (beta-Toc). These antioxidants exerted a protective effect against NH(2)Cl-induced cell death, and alpha-Toc exhibited the most potent inhibitory effect among the antioxidants used. A loss of cellular glutathione was observed in the cells treated with 100 microM NH(2)Cl. The formation of reactive oxygen species (ROS) was also measured using the fluorescent probe dichlorofluorescin diacetate. The fluorescence intensity increased prior to cell death and an antioxidant, such as alpha-Toc, suppressed the increase in ROS. Interestingly, beta-Toc also exerted similar inhibitory effects on cytotoxicity and caspase activation. These results suggest that free radical mediated process is involved in NH(2)Cl-induced PC12 cell death and that tocopherols inhibit this cell death via antioxidative function.
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Affiliation(s)
- Rosaria Piga
- Human Stress Signal Research Center (HSSRC), National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan
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Deiana M, Rosa A, Casu V, Piga R, Assunta Dessì M, Aruoma OI. L-ergothioneine modulates oxidative damage in the kidney and liver of rats in vivo: studies upon the profile of polyunsaturated fatty acids. Clin Nutr 2004; 23:183-93. [PMID: 15030958 DOI: 10.1016/s0261-5614(03)00108-0] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2003] [Accepted: 06/17/2003] [Indexed: 10/27/2022]
Abstract
BACKGROUND & AIMS L-ergothioneine is a fungal metabolite exhibiting antioxidant functions in cells. The aim of this study was to assess the effect of oral administration of L-ergothioneine on the oxidative damage in vivo caused by the Fenton reagent ferric-nitrilotriacetate. METHODS Rats were supplemented with L-ergo prior to the administration of acute dose of ferric-nitrilotriacetate. Kidney and liver levels of L-ergothioneine, glutathione, alpha-tocopherol, polyunsaturated fatty acids and conjugated dienes were assessed. RESULTS Oral administration of 70 mg L-ergo/kg body weight of rats for 7 days prior to the injection of ferric-nitrilotriacetate protected the fatty acids against oxidation, with notable protections directed to: 20:5 (eicosapentaenoic acid) (23%), 22:6 (docosahexaenoinic acid) (30%), 20:3 n6 (eicosatrienoic acid) (22%), 20:4 (arachidonic acid) (25%), 18:2 linoleic acid (25%) and 18:1 oleic acid (14%) in the kidney. The protection of 20:5, 20:3 n6 and 18:1 in the liver by 32%, 20% and 11%, respectively, were statistically significant. L-ergothioneine significantly reduced kidney and liver levels of conjugated dienes and conserved the concentrations of alpha-tocopherol and glutathione in the kidney and liver in the ferric-nitrilotriacetate/L-ergothioneine treated rats. CONCLUSION Supplementation with L-ergothioneine not only protects the organs against the lipid peroxidation but conserves the consumption of endogenous glutathione and alpha-tocopherol. However consumption of mushrooms may have better promise as dietary sources of L-ergothioneine to humans.
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Affiliation(s)
- Monica Deiana
- Dipartimento di Biologia Sperimentale, Sezione Patologia Sperimentale, Università degli Studi di Cagliari, Cittadella Universitaria SS 554, 09042 Monserrato, Cagliari, Italy.
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Aruoma OI, Deiana M, Rosa A, Casu V, Piga R, Peccagnini S, Dessi MA, Ke B, Liang YF, Higa T. Assessment of the ability of the antioxidant cocktail-derived from fermentation of plants with effective microorganisms (EM-X) to modulate oxidative damage in the kidney and liver of rats in vivo: studies upon the profile of poly- and mono-unsaturated fatty acids. Toxicol Lett 2002; 135:209-17. [PMID: 12270679 DOI: 10.1016/s0378-4274(02)00261-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The antioxidant cocktail EM-X derived from ferment of unpolished rice, papaya and sea weeds with effective microorganisms (EM) of lactic acid bacteria, yeast, and photosynthetic bacteria is widely available in South-East Asia. Oral administration of a EM-X to rats for 7 days inhibited the ferric-nitrilotriacetic acid (Fe-NTA)-dependent oxidation of fatty acids with protections directed towards docosahexanoic, arachidonic, docosapentanenoic acids, oleic, linoleic and eicosadieonoic acids in the liver and kidney. But only the protections of oxidation to docosahexanoic, arachidonic acid in the kidney were statistically significant. Treatment of rats with EM-X prior to the intraperitoneal administration of Fe-NTA led to a reduction in the overall levels of conjugated dienes (CD) measured in the kidney by 27% and in the liver by 19% suggesting inhibition of lipid peroxidation in these organs. The levels of glutathione and alpha-tocopherol were largely unaffected suggesting that the protection by the regular strength of EM-X was confined to the inhibition of lipid peroxidation in vivo, a point dependent on the concentrations of bioactive flavonoids.
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Affiliation(s)
- Okezie I Aruoma
- Division of Neuroscience and Psychological Medicine, Department of Neuroinflammation, Faculty of Medicine, Imperial College of Science, Technology and Medicine, Charing Cross Hospital Campus, Fulham Palace Road, London W6 8RF, UK.
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Deiana M, Aruoma OI, Rosa A, Crobu V, Casu V, Piga R, Dessi MA. The effect of ferric-nitrilotriacetic acid on the profile of polyunsaturated fatty acids in the kidney and liver of rats. Toxicol Lett 2001; 123:125-33. [PMID: 11641040 DOI: 10.1016/s0378-4274(01)00372-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Intraperitoneal injection of the iron-complex, ferric-nitrilotriacetate (Fe-NTA), induces renal proximal tubular damage associated with oxidative damage in vivo. Fe-NTA induced a time-dependent decrease of several polyunsaturated fatty acids (PUFA), together with increased conjugated diene values and decreased cellular levels of alpha-tocopherol and glutathione. At the time of maximum detectable oxidation (3 h), after the injection of a sublethal dose of Fe-NTA there were clear reductions in the peak values over the controls for several fatty acids notably, 20:5 (eicosapentaenoic acid) (36%), 22:6 (docosahexanoic acid) (30%), 20:3 n6 (eicosatrienoic acid) (30%) and 20:4 (arachidonic acid) (28%) in the kidney. Fewer fatty acids showed a reduction in their residual values in the liver. 20:5 was reduced by 45% and for the 18:3 n3 and 18:3 n6, reductions of 35%, respectively. The profile of PUFAs is sensitive to the oxidative damage due to Fe-NTA and this may find applications as oxidative biomarker model.
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Affiliation(s)
- M Deiana
- Dipartimento di Biologia Sperimentale, Sez. Patologia Sperimentale, Università degli Studi di Cagliari, Cittadella Universitaria SS 554, 09042, Monserrato, Cagliari, Italy.
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Ledda-Columbano GM, Pibiri M, Perra A, Piga R, Loi R, Dore M, Shinozuka H, Columbano A. Ciprofibrate and triiodothyronine do not suppress in vivo induction of placental glutathione S-transferase expression in rat hepatocytes. Cancer Lett 2000; 151:153-9. [PMID: 10738109 DOI: 10.1016/s0304-3835(99)00407-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Studies on hepatocyte primary cultures have suggested that loss of expression of the placental form of glutathione S-transferase in peroxisome proliferator (PP)-induced hepatocarcinogenesis is due to inhibition of glutathione S-transferase P (GSTP) transcription by the PPs. In the present study, we have analyzed the effect of a PP, ciprofibrate, and of another ligand of nuclear receptors, 3,3', 5-triiodo-L-thyronine (T3), on GSTP mRNA and protein levels in an in vivo model where GSTP expression was induced in Wistar rats by pre-treatment with a single dose of lead nitrate. Results indicate that administration of ciprofibrate or T3, immediately after lead nitrate treatment, did not exert any inhibitory effect on GSTP mRNA and protein levels, as revealed by both Western and immunohistochemical analysis. The results indicate that PPs do not inhibit hepatocyte GSTP expression induced in vivo by lead nitrate and suggest that inhibition of GSTP expression by PPs may not necessarily be the cause for the rapid disappearance of GSTP-positive preneoplastic lesions observed after a short term exposure to these agents.
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Affiliation(s)
- G M Ledda-Columbano
- Department of Toxicology, Oncology and Molecular Pathology Unit, University of Cagliari, Via Porcell 4, 09124, Cagliari, Italy.
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Ledda-Columbano GM, Perra A, Piga R, Pibiri M, Loi R, Shinozuka H, Columbano A. Cell proliferation induced by 3,3',5-triiodo-L-thyronine is associated with a reduction in the number of preneoplastic hepatic lesions. Carcinogenesis 1999; 20:2299-304. [PMID: 10590223 DOI: 10.1093/carcin/20.12.2299] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Previous studies have suggested that liver cell proliferation is fundamental for the growth of carcinogen-initiated cells. To gain further information on the association between cell proliferation and hepatocarcinogenesis, we have examined the effect of the hormone 3,3',5-triiodo-L-thyronine (T3), a strong liver mitogen, on the growth of diethylnitrosamine (DENA)-induced hepatic lesions positive for the placental form of glutathione S-transferase (GSTP). Two weeks after a single initiating dose of DENA (150 mg/kg), cycles of liver cell proliferation were induced in male Fischer rats by feeding a T3-supplemented diet (4 mg/kg) 1 week/month for 7 months. Rats were killed at the end of the seventh cycle or 1 month later. Results indicate that, in spite of an increased labelling index, a 70% reduction in the number/cm(2) of GSTP-positive minifoci occurred in T3-treated rats. A decrease in the number of GSTP-positive foci was also observed in T3-treated rats killed 1 month after the last exposure to the hormone (40, versus 67 foci/cm(2) in controls), indicating that the reduction was not due to an inhibitory effect on GSTP exerted by the concomitant presence of T3. In a second series of experiments where DENA-treated rats were fed T3 for 1 week and then subjected to the resistant hepatocyte (RH) model, it was found that T3 treatment prior to promotion resulted in a decrease in the number of GSTP-positive foci (16 GSTP(+) foci/cm(2) in T3-fed animals versus 45 in the control group). The results indicate that cell proliferation associated with T3 treatment: (i) reduces the number of carcinogen-induced GSTP-positive lesions; (ii) does not exert any differential effect on the growth of the remaining foci; (iii) inhibits the capacity of putative DENA-initiated cells to be promoted by the RH model. Data suggest that cell proliferation may not necessarily represent a stimulus for the growth of putative preneoplastic lesions.
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Affiliation(s)
- G M Ledda-Columbano
- Dipartimento di Tossicologia, Sezione di Oncologia e Patologia Molecolare, Via Porcell 4, 09124 Cagliari, Italy.
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Ledda-Columbano GM, Curto M, Piga R, Zedda AI, Menegazzi M, Sartori C, Shinozuka H, Bluethmann H, Poli V, Ciliberto G, Columbano A. In vivo hepatocyte proliferation is inducible through a TNF and IL-6-independent pathway. Oncogene 1998; 17:1039-44. [PMID: 9747883 DOI: 10.1038/sj.onc.1202018] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Recent studies in mice harboring a targeted disruption of genes encoding TNF receptor 1 (TNFR-1) or Interleukin 6 (IL-6) suggested a critical role for TNF and IL-6 in initiation of liver regeneration after 2/3 partial hepatectomy. However, hepatocyte proliferation can also occur following treatment with agents that do not induce tissue loss (primary mitogens). To determine whether the above cytokines could also be involved in mitogen-induced liver cell proliferation, we studied the hepatocyte proliferative response after treatment with primary mitogens in mice knock-out for TNFR-1 or IL-6. Our results showed no difference in the proliferative response of the liver between the wild type and the knock-out mice following treatment with the mitogens 1,4-bis[2-(3,5-dichloropyridyloxy)]benzene (TCPOBOP), or the peroxisome proliferator, ciprofibrate, suggesting that TNF or IL-6 may not play a major role in this type of proliferation. Gel shift assay indicated that TCPOBOP-induced hepatocyte proliferation is not associated with activation of STAT3 transcription factor, a major target of IL-6 and other growth factors/cytokines. Our results thus indicate that hepatocyte proliferation can be induced by at least two different pathways; compensatory regeneration being TNF and IL-6-dependent, and mitogen-induced direct hyperplasia which does not require TNF or IL-6.
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Menegazzi M, Carcereri-De Prati A, Suzuki H, Shinozuka H, Pibiri M, Piga R, Columbano A, Ledda-Columbano GM. Liver cell proliferation induced by nafenopin and cyproterone acetate is not associated with increases in activation of transcription factors NF-kappaB and AP-1 or with expression of tumor necrosis factor alpha. Hepatology 1997; 25:585-92. [PMID: 9049203 DOI: 10.1002/hep.510250316] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Our previous studies have shown a different pattern of immediate early gene and growth factor gene expression between compensatory liver regeneration occurring after cell loss/death and direct hyperplasia induced by primary mitogens. In the present study, modifications in the activation of two transcription factors, NF-kappaB and AP-1; steady-state levels of tumor necrosis factor alpha (TNF-alpha) messenger RNA (mRNA); and induction of the inducible nitric oxide synthase (iNOS) were examined in rat liver during different types of cell proliferation. Compensatory regeneration was induced in male Wistar rats by partial hepatectomy of two thirds (PH) or a necrogenic dose of CCl4 (2 mL/kg), whereas direct hyperplasia was induced by a single administration of the primary mitogens lead nitrate (LN, 100 micromol/kg), cyproterone acetate (CPA, 60 mg/kg), or nafenopin (NAF, 200 mg/kg). Liver regeneration after treatment with CCl4 was associated with an increase in steady-state levels of TNF-alpha mRNA, activation of NF-kappaB and AP-1, and induction of iNOS. A strong and prolonged activation of NF-kappaB but not of AP-1 was observed in LN-induced hyperplasia. LN also induced an increase in hepatic levels of TNF-alpha and iNOS mRNA. On the other hand, direct hyperplasia induced by two other primary mitogens, NAF and CPA, occurred in the complete absence of modifications in the hepatic levels of TNF-alpha mRNA, activation of NF-kappaB and AP-1, or induction of iNOS, although the number of hepatocytes entering S phase 18 to 24 hours after NAF was similar to that seen after PH. These results add further support to the hypothesis that cell proliferation occurring in the absence of cell loss/death may be triggered by unknown signaling pathways different from those responsible for the transition of hepatocytes from G0 to G1 after PH or cell necrosis.
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Affiliation(s)
- M Menegazzi
- Dipartimento di Biochimica, Università di Verona, Italy
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Columbano A, Ledda-Columbano GM, Pibiri M, Piga R, Shinozuka H, De Luca V, Cerignoli F, Tripodi M. Increased expression of c-fos, c-jun and LRF-1 is not required for in vivo priming of hepatocytes by the mitogen TCPOBOP. Oncogene 1997; 14:857-63. [PMID: 9047393 DOI: 10.1038/sj.onc.1200891] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The notion that an increased expression of immediate early genes such as c-fos and c-jun is an absolute requirement for the G0-G1 transition of the hepatocytes has recently been challenged by the finding that rat liver cell proliferation induced by primary mitogens may occur in the absence of such changes (Columbano and Shinozuka, 1996). To further investigate the relationship between immediate early genes and hepatocyte proliferation, we have compared the hepatic levels of c-fos, c-jun and LRF-1 transcripts during mouse liver cell proliferation in two conditions: (i) direct hyperplasia induced by the non-genotoxic hepatocarcinogen 1,4-bis[2-(3,5-dichloropyridyloxy)]benzene, and (ii) compensatory regeneration caused by a necrogenic dose of carbon tetrachloride. The results show striking differences in the activation of early genes. In spite of a rapid stimulation of S phase by 1,4-bis[2-(3,5-dichloropyridyloxy)]benzene (approximately 8% of hepatocytes were BrdU-positive as early as 24 h after mitogen treatment versus 1% of labelled hepatocytes after 2/3 partial hepatectomy), no changes in the expression of c-fos, c-jun and LRF-1 could be observed. Moreover, no change in steady state mRNA hepatic levels of IGFBP-1 (a gene highly expressed in rat liver following partial hepatectomy), and only a slight increase in c-myc and PRL-1, was found after mitogen administration. On the contrary, a rapid, massive and transient increase in the hepatic mRNA levels of all these genes was observed during carbon tetrachloride induced regeneration. The results indicate that increased expression of immediate early genes may be dependent upon the nature of the proliferative stimulus, and it may not be a prerequisite in certain in vivo conditions such as proliferation induced in the absence of liver tissue damage.
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Affiliation(s)
- A Columbano
- Istituto di Patologia Sperimentale, Università di Cagliari, Italy
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Ohmura T, Ledda-Columbano GM, Piga R, Columbano A, Glemba J, Katyal SL, Locker J, Shinozuka H. Hepatocyte proliferation induced by a single dose of a peroxisome proliferator. Am J Pathol 1996; 148:815-24. [PMID: 8774136 PMCID: PMC1861716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
In compensatory hyperplasia after partial hepatectomy or liver cell injury, hepatocyte proliferation is triggered by coordinated actions of growth factor such as hepatocyte growth factor and transforming growth factor-alpha and -beta. Initiation of hepatocyte DNA synthesis is preceded by the activation of the set of early growth response genes mediated by enhanced nuclear factor-kappa B binding to DNA. Using an experimental model to induce hepatocyte DNA synthesis in vivo by a single dose of a peroxisome proliferator, which does not induce liver cell necrosis (direct hyperplasia), we investigated whether peroxisome proliferator-induced hepatocyte proliferation involved an induction of known growth factors, an activation of early growth response genes, and nuclear factor-kappa B. A single intragastric administration of 250 mg/kg BR931 (4-chloro-6-(2,3-xylidino)-2-pyrimidinylthio-(N-beta-hydroxyethyl) acetamide) to male wistar rats induced a wave of hepatocyte DNA synthesis starting after 12 hours and peaking at approximately 24 to 36 hours. The response was dose dependent. The treatment also induced the expression of the mRNA for the peroxisomal bifunctional enzyme, one of the peroxisome-related fatty acid beta-oxidation enzymes. Pretreatment of rats with dexamethasone (2 mg/kg) inhibited both hepatocyte DNA synthesis and the induction of the peroxisomal bifunctional enzyme gene. Northern blot analyses of liver RNA during a period preceding the onset of DNA synthesis revealed no induction of hepatocyte growth factor, transforming growth factor-alpha, or tumor necrosis factor-alpha mRNAs. No induction of early growth response genes, liver regeneration factor-1, or c-myc was detected. Furthermore, gel mobility shift assays showed no enhanced nuclear factor-kappa B binding to its DNA consensus sequence after BR931 treatment, whereas control studies demonstrated a distinct increase in binding after partial hepatectomy or lead nitrate treatment. The results suggest that peroxisome-proliferator-induced hepatocyte proliferation may be triggered by signal transduction pathways different from those after partial hepatectomy and that the binding of peroxisome proliferators to their nuclear receptors may play a role in stimulation of DNA synthesis and peroxisome proliferation.
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Affiliation(s)
- T Ohmura
- Department of Pathology, University of Pittsburgh School of Medicine, Pennsylvania 15261, USA
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