51
|
Selenium-Functionalized Molecules (SeFMs) as Potential Drugs and Nutritional Supplements. TOPICS IN MEDICINAL CHEMISTRY 2015. [DOI: 10.1007/7355_2015_87] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
|
52
|
Chen X, Yao H, Yao L, Zhao J, Luan Y, Zhang Z, Xu S. Selenium deficiency influences the gene expressions of heat shock proteins and nitric oxide levels in neutrophils of broilers. Biol Trace Elem Res 2014; 161:334-40. [PMID: 25315471 DOI: 10.1007/s12011-014-0150-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Accepted: 09/28/2014] [Indexed: 11/29/2022]
Abstract
The aim of the present study was to investigate the effects of selenium (Se) deficiency on the expressions of heat shock proteins (Hsp90, 70, 60, 40, and 27) and nitric oxide (NO) levels in neutrophils of broilers. One hundred eighty 1-day-old broilers were randomly assigned into two groups and were fed on a low-Se diet (0.008 mg/kg Se) or a control diet (0.2 mg/kg Se), respectively. Then, the messenger RNA (mRNA) levels of Hsp90, 70, 60, 40, and 27, induced nitric oxide synthase (iNOS), and NO levels were examined. The results showed that Se deficiency increased the mRNA levels of Hsps and iNOS and induced higher level of NO in chicken neutrophils (P < 0.05). It showed that the expression of Hsp40 increased higher than other Hsps in neutrophils, which indicated that it might play the crucial protective role in neutrophils. In addition, correlation analysis showed that iNOS had the biggest correlation with Hsp60, which indicated that Hsp60 might play an important function in inhibiting the production of NO, and the correlation coefficient between Hsp60 and Hsp70 was over 0.9, which indicated that they might have a synergistic effect. These results suggested that the level of NO and Hsp expression levels in neutrophils can be influenced by Se deficiency. And Hsp40 might play the crucial protective role in neutrophils induced by Se deficiency.
Collapse
Affiliation(s)
- Xi Chen
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, 150030, People's Republic of China
| | | | | | | | | | | | | |
Collapse
|
53
|
Zhao X, Yao H, Fan R, Zhang Z, Xu S. Selenium deficiency influences nitric oxide and selenoproteins in pancreas of chickens. Biol Trace Elem Res 2014; 161:341-9. [PMID: 25319006 DOI: 10.1007/s12011-014-0139-9] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Accepted: 09/22/2014] [Indexed: 01/01/2023]
Abstract
Selenium (Se) deficiency induces pancreatic atrophy in chickens, but the molecular mechanism remains unclear. In this study, we investigated the effect of dietary Se deficiency on the expressions of 25 selenoproteins and the content of nitric oxide (NO) and examined the relationship between selenoproteins and NO. Chickens (180; 1 day old) were randomly divided into two groups, low (L) group (fed with Se deficient (Se 0.033 mg/kg) diet) and control (C) group (fed with normal (Se 0.2 mg/kg) diet). Then, pancreas was collected at 15, 25, 35, 45, and 55 days, and the content of NO, the activity of inducible NO synthase (iNOS), and the messenger RNA (mRNA) levels of 25 selenoproteins and iNOS were measured. The results showed that 25 selenoproteins were decreased (P < 0.05) by Se deficiency. Among them, thioredoxin reductase 1 (TXNRD1), selenoprotein S (SELS), selenoprotein U (SELU), selenoprotein X1 (SEPX1), and selenoprotein synthetase 2 (SPS2) were highly and extensively expressed than other types of selenoproteins in pancreas of chickens (P < 0.05). Thioredoxin reductase 2 (TXNRD2), glutathione peroxidase 1 (GPX1), glutathione peroxidase 3 (GPX3), selenoprotein I (SELI), iodothyronine deiodinase 1 (DIO1), selenoprotein P1 (SEPP1), selenoprotein W1 (SEPW1), selenoprotein O (SELO), selenoprotein T (SELT), selenoprotein M (SELM), selenoprotein X1 (SEPX1), and SPS2 were excessively decreased (P < 0.05). Meanwhile, NO content, iNOS activity, and mRNA level were increased strikingly compared with C group (P < 0.05). The correlation analysis suggested that NO had a strong negative correlation with GPX1, glutathione peroxidase 2 (GPX2), GPX3, DIO1, selenoprotein K (SELK), SELI, SEPX1, and SPS2. These results suggested that Se deficiency induced pancreatic injury by influencing NO and selenoproteins in pancreas of chickens. Thus, it offers some information on the mechanism of pancreatic injury induced by Se deficiency.
Collapse
Affiliation(s)
- Xia Zhao
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, 150030, People's Republic of China
| | | | | | | | | |
Collapse
|
54
|
Wei Z, Yao M, Li Y, Yang Z, Feng X. RETRACTED ARTICLE: Inhibition of Lipopolysaccharide (LPS)-Induced Inflammatory Responses by Selenium in Bovine Mammary Epithelial Cells in Primary Culture. Inflammation 2014; 38:152-8. [DOI: 10.1007/s10753-014-0017-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
55
|
Zhang Z, Zhang J, Xiao J. Selenoproteins and selenium status in bone physiology and pathology. Biochim Biophys Acta Gen Subj 2014; 1840:3246-3256. [PMID: 25116856 DOI: 10.1016/j.bbagen.2014.08.001] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Revised: 07/23/2014] [Accepted: 08/04/2014] [Indexed: 02/07/2023]
Abstract
BACKGROUND Emerging evidence supports the view that selenoproteins are essential for maintaining bone health. SCOPE OF REVIEW The current state of knowledge concerning selenoproteins and Se status in bone physiology and pathology is summarized. MAJOR CONCLUSIONS Antioxidant selenoproteins including glutathione peroxidase (GPx) and thioredoxin reductase (TrxR), as a whole, play a pivotal role in maintaining bone homeostasis and protecting against bone loss. GPx1, a major antioxidant enzyme in osteoclasts, is up-regulated by estrogen, an endogenous inhibitor of osteoclastogenesis. TrxR1 is an immediate early gene in response to 1α,25-dihydroxyvitamin D3, an osteoblastic differentiation agent. The combination of 1α,25-dihydroxyvitamin D3 and Se generates a synergistic elevation of TrxR activity in Se-deficient osteoblasts. Of particular concern, pleiotropic TrxR1 is implicated in promoting NFκB activation. Coincidentally, TrxR inhibitors such as curcumin and gold compounds exhibit potent osteoclastogenesis inhibitory activity. Studies in patients with the mutations of selenocysteine insertion sequence-binding protein 2, a key trans-acting factor for the co-translational insertion of selenocysteine into selenoproteins have clearly established a causal link of selenoproteins in bone development. Se transport to bone relies on selenoprotein P. Plasma selenoprotein P concentrations have been found to be positively correlated with bone mineral density in elderly women. GENERAL SIGNIFICANCE A full understanding of the role and function of selenoproteins and Se status on bone physiology and pathology may lead to effectively prevent against or modify bone diseases by using Se.
Collapse
Affiliation(s)
- Zhichao Zhang
- Department of Orthopaedic Oncology, Changzheng Hospital, The Second Military Medical University, Shanghai 200003, PR China
| | - Jinsong Zhang
- School of Tea Food Science, Anhui Agricultural University, Hefei 230036, Anhui, PR China.
| | - Jianru Xiao
- Department of Orthopaedic Oncology, Changzheng Hospital, The Second Military Medical University, Shanghai 200003, PR China.
| |
Collapse
|
56
|
Wei Z, Yao M, Li Y, He X, Yang Z. Dietary Selenium Deficiency Exacerbates Lipopolysaccharide-Induced Inflammatory Response in Mouse Mastitis Models. Inflammation 2014; 37:1925-31. [DOI: 10.1007/s10753-014-9925-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
57
|
Mattmiller SA, Carlson BA, Gandy JC, Sordillo LM. Reduced macrophage selenoprotein expression alters oxidized lipid metabolite biosynthesis from arachidonic and linoleic acid. J Nutr Biochem 2014; 25:647-54. [PMID: 24746836 DOI: 10.1016/j.jnutbio.2014.02.005] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Revised: 01/29/2014] [Accepted: 02/05/2014] [Indexed: 10/25/2022]
Abstract
Uncontrolled inflammation is an underlying etiology for multiple diseases and macrophages orchestrate inflammation largely through the production of oxidized fatty acids known as oxylipids. Previous studies showed that selenium (Se) status altered the expression of oxylipids and magnitude of inflammatory responses. Although selenoproteins are thought to mediate many of the biological effects of Se, the direct effect of selenoproteins on the production of oxylipids is unknown. Therefore, the role of decreased selenoprotein activity in modulating the production of biologically active oxylipids from macrophages was investigated. Thioglycollate-elicited peritoneal macrophages were collected from wild-type and myeloid-cell-specific selenoprotein knockout mice to analyze oxylipid production by liquid chromatography/mass spectrometry as well as oxylipid biosynthetic enzyme and inflammatory marker gene expression by quantitative real-time polymerase chain reaction. Decreased selenoprotein activity resulted in the accumulation of reactive oxygen species, enhanced cyclooxygenase and lipoxygenase expression and decreased oxylipids with known anti-inflammatory properties such as arachidonic acid-derived lipoxin A₄ (LXA₄) and linoleic acid-derived 9-oxo-octadecadienoic acid (9-oxoODE). Treating RAW 264.7 macrophages with LXA₄ or 9-oxoODE diminished oxidant-induced macrophage inflammatory response as indicated by decreased production of TNFα. The results show for the first time that selenoproteins are important for the balanced biosynthesis of pro- and anti-inflammatory oxylipids during inflammation. A better understanding of the Se-dependent control mechanisms governing oxylipid biosynthesis may uncover nutritional intervention strategies to counteract the harmful effects of uncontrolled inflammation due to oxylipids.
Collapse
Affiliation(s)
- Sarah A Mattmiller
- College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824, USA
| | - Bradley A Carlson
- Molecular Biology of Selenium Section, Mouse Cancer Genetics Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Jeff C Gandy
- College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824, USA
| | - Lorraine M Sordillo
- College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824, USA.
| |
Collapse
|
58
|
Sheng PF, Jiang Y, Zhang ZW, Zhang JL, Li S, Zhang ZQ, Xu SW. The effect of Se-deficient diet on gene expression of inflammatory cytokines in chicken brain. Biometals 2013; 27:33-43. [PMID: 24318354 DOI: 10.1007/s10534-013-9682-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2013] [Accepted: 10/20/2013] [Indexed: 01/24/2023]
Abstract
Selenium (Se) plays an important role in the brain development, function, and degeneration, nutritional encephalomalacia is closely related with dietary Se in avian. However, there is little evidence on the relationship between inflammation and encephalomalacia in avian and the mechanism which Se regulates the inflammatory response in brain tissues remains to be unclear. The present paper describes the effects of Se-deficient granulated diet on one transcription factor-nuclear factor kappaB and four pro-inflammatory cytokines-tumor necrosis factor, cyclooxygenase2, inducible nitric oxide synthase and Prostaglandin E synthase mRNA expression in the chicken brain tissues associated encephalomalacia. One hundred male chickens (1 day old; Weiwei Co. Ltd., Harbin, China) were divided into two groups (50 chickens per group). The expression levels in the brain tissues (cerebral gray matter, cerebral white matter, marrowbrain, cerebellum, thalamus and brain stem) were determined by real-time PCR on days 15, 25, 35, 45, and 55, respectively. The results showed the productions of pro-inflammatory mediators were increased following Se-deficiency. These data indicate the correlations between nutritional encephalomalacia and inflammatory response and the activity of inflammatory response in chicken brain may be induced by Se-deficiency.
Collapse
Affiliation(s)
- Peng-Fei Sheng
- Department of Veterinary Medicine, Northeast Agricultural University, Harbin, 150030, People's Republic of China
| | | | | | | | | | | | | |
Collapse
|
59
|
Kabara E, Sordillo LM, Holcombe S, Contreras GA. Adiponectin links adipose tissue function and monocyte inflammatory responses during bovine metabolic stress. Comp Immunol Microbiol Infect Dis 2013; 37:49-58. [PMID: 24296305 DOI: 10.1016/j.cimid.2013.10.007] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 09/10/2013] [Accepted: 10/30/2013] [Indexed: 12/17/2022]
Abstract
The periparturient period of dairy cows is characterized by intense lipid mobilization from adipose tissue leading to increased plasma concentrations of nonesterified fatty acids (NEFA). High NEFA are a predisposing factor for inflammatory based diseases. A major component of these diseases is uncontrolled macrophage/monocyte inflammatory responses. Changes in the endocrine activity of adipose tissue during the periparturient period could impact macrophage function by modifying the secretion of adipokines including adiponectin. Currently, the effects of adiponectin on monocyte activation in dairy cattle are unknown. In humans and rodents, this adipokine regulates monocyte phenotype and alterations in its plasma levels are linked with the development of inflammatory diseases. The objectives of this study were to establish associations between plasma adiponectin expression dynamics and different markers of lipid mobilization during the periparturient period of dairy cows and to characterize the effects of adiponectin on the inflammatory response of bovine monocytes. Plasma adiponectin, NEFA, BHB, albumin, and subcutaneous and retroperitoneal fat depots depth were measured during the periparturient period of dairy cows. In vitro, bovine monocytes were cultured with adiponectin to assess changes in pro-inflammatory responses following LPS stimulation. Results from this study demonstrate that alterations in plasma adiponectin levels in periparturient cattle are inversely correlated with the concentrations of plasma NEFA, an important marker of lipid mobilization. Furthermore, adiponectin exposure significantly decreased monocyte expression of TNFα after LPS stimulation thus markedly reducing their inflammatory response. Reduced plasma adiponectin during the periparturient period could predispose dairy cows to the development of uncontrolled monocyte inflammatory responses.
Collapse
Affiliation(s)
- Ed Kabara
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824, USA
| | - Lorraine M Sordillo
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824, USA
| | - Sue Holcombe
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824, USA
| | - G Andres Contreras
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824, USA.
| |
Collapse
|
60
|
Chitta KR, Landero-Figueroa JA, Kodali P, Caruso JA, Merino EJ. Identification of selenium-containing proteins in HEK 293 kidney cells using multiple chromatographies, LC–ICPMS and nano-LC–ESIMS. Talanta 2013; 114:25-31. [DOI: 10.1016/j.talanta.2013.03.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2013] [Revised: 02/28/2013] [Accepted: 03/01/2013] [Indexed: 02/07/2023]
|
61
|
Mattmiller SA, Carlson BA, Sordillo LM. Regulation of inflammation by selenium and selenoproteins: impact on eicosanoid biosynthesis. J Nutr Sci 2013; 2:e28. [PMID: 25191577 PMCID: PMC4153324 DOI: 10.1017/jns.2013.17] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2012] [Revised: 04/29/2013] [Accepted: 05/01/2013] [Indexed: 11/07/2022] Open
Abstract
Uncontrolled inflammation is a contributing factor to many leading causes of human morbidity and mortality including atherosclerosis, cancer and diabetes. Se is an essential nutrient in the mammalian diet that has some anti-inflammatory properties and, at sufficient amounts in the diet, has been shown to be protective in various inflammatory-based disease models. More recently, Se has been shown to alter the expression of eicosanoids that orchestrate the initiation, magnitude and resolution of inflammation. Many of the health benefits of Se are thought to be due to antioxidant and redox-regulating properties of certain selenoproteins. The present review will discuss the existing evidence that supports the concept that optimal Se intake can mitigate dysfunctional inflammatory responses, in part, through the regulation of eicosanoid metabolism. The ability of selenoproteins to alter the biosynthesis of eicosanoids by reducing oxidative stress and/or by modifying redox-regulated signalling pathways also will be discussed. Based on the current literature, however, it is clear that more research is necessary to uncover the specific beneficial mechanisms behind the anti-inflammatory properties of selenoproteins and other Se metabolites, especially as related to eicosanoid biosynthesis. A better understanding of the mechanisms involved in Se-mediated regulation of host inflammatory responses may lead to the development of dietary intervention strategies that take optimal advantage of its biological potency.
Collapse
Key Words
- 15-HETE, 15(S)-hydroxy-(5Z,8Z,11Z,13E)-eicosatetraenoic acid
- 15-HPETE, 15-hydroperoxyeicosatetraenoic acid
- 15d-PGJ2, 15-deoxy-Δ12,14PGJ2
- AA, arachidonic acid
- ASK-1, apoptosis signal-regulating kinase 1
- COX, cyclo-oxygenase
- Eicosanoid biosynthesis
- FAHP, fatty acid hydroperoxide
- GPx, glutathione peroxidase
- GPx4, glutathione peroxidase-4
- H-PGDS, haematopoietic PGD2 synthase
- HO-1, haeme oxygenase-1
- HPETE, hydroperoxyeicosatetraenoic acid
- HPODE, hydroperoxyoctadecadienoic acid
- Inflammation
- LA, linoleic acid
- LOX, lipoxygenase
- LPS, lipopolysaccharide
- LT, leukotriene
- LTA4H, leukotriene A4 hydrolase
- MAPK, itogen-activated protein kinase
- ROS, reactive oxygen species
- Selenium
- Selenoproteins
- Sepp1, selenoprotein P plasma 1
- TX, thromboxane
- TXB2, thromboxane B2
- Trx, thioredoxin
- TrxR, thioredoxin reductase
- ppm, parts per million
Collapse
Affiliation(s)
- S. A. Mattmiller
- College of Veterinary Medicine, Michigan State
University, East Lansing, MI 48824,
USA
| | - Bradley A. Carlson
- Section on the Molecular Biology of Selenium,
Laboratory of Cancer Prevention, National Cancer Institute,
National Institutes of Health, Bethesda, MD 20892,
USA
| | - L. M. Sordillo
- College of Veterinary Medicine, Michigan State
University, East Lansing, MI 48824,
USA
| |
Collapse
|
62
|
Ying X, Chen X, Cheng S, Zhao Z, Guo X, Chen H, Hong J, Peng L, Xu H. SeMet inhibits IL-1β-induced rheumatoid fibroblast-like synoviocytes proliferation and the production of inflammatory mediators. Biol Trace Elem Res 2013; 153:437-45. [PMID: 23681674 DOI: 10.1007/s12011-013-9696-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2013] [Accepted: 05/01/2013] [Indexed: 10/26/2022]
Abstract
Previous studies demonstrated that Se has anti-inflammatory activities and that it plays an important role in maintaining normal cartilage metabolism. Nevertheless, little is known about the effects of Se on the production of inflammatory mediators in rheumatoid fibroblast-like synoviocytes (FLSs). The objective of this study was to determine the effects of Se on the interleukin-1β (IL-1β)-induced proliferation of FLSs and production of matrix metalloproteinases (MMPs) and inflammatory mediators by FLSs. In this study, the proliferation of FLSs was assessed using the MTT assay after cultured with/without the presence of IL-1β and SeMet. Human FLSs were pretreated with SeMet (0.5 μM) and subsequently stimulated with IL-1β (5 ng/ml) for 24 h. Production of NO and PGE2 were evaluated by the Griess reaction and ELISA. Gene expression of MMP-3, MMP-13, iNOS, and COX-2 was measured by real-time PCR. MMP-3 and MMP-13 proteins in culture medium were determined using cytokine-specific ELISA. Western immunoblotting was used to analyze the iNOS and COX-2 protein production in the culture medium and the activity of phosphorylation of P38 MAPK pathways. We found that SeMet significantly inhibits IL-1β-induced proliferation of FLSs. SeMet also inhibited the production of PGE2 and NO induced by IL-1β. SeMet significantly decreased IL-1β-stimulated gene expression and production of MMP-3, MMP-13, iNOS, and COX-2 in human FLSs. In addition, we found SeMet partly inhibited the IL-1β-induced activation of p38 MAPK pathways. The present report is first to demonstrate that SeMet inhibits IL-1β-induced expression of MMPs and production of inflammatory factors in cultured FLSs, indicating that SeMet may be a potential agent in the treatment of rheumatoid arthritis.
Collapse
Affiliation(s)
- Xiaozhou Ying
- Department of Orthopaedic Surgery, The Second Affiliated Hospital of Wenzhou Medical College, 109 Xue Yuan Xi Road, Wenzhou 325000, China
| | | | | | | | | | | | | | | | | |
Collapse
|
63
|
Lee JH, Choi EJ, Park HS, Kim GH. Evaluation of Compositae sp. plants for antioxidant activity, antiinflammatory, anticancer and antiadipogenic activityin vitro. FOOD AGR IMMUNOL 2012. [DOI: 10.1080/09540105.2012.749394] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
|
64
|
Salehi M, Sohrabi Z, Ekramzadeh M, Fallahzadeh MK, Ayatollahi M, Geramizadeh B, Hassanzadeh J, Sagheb MM. Selenium supplementation improves the nutritional status of hemodialysis patients: a randomized, double-blind, placebo-controlled trial. Nephrol Dial Transplant 2012; 28:716-23. [DOI: 10.1093/ndt/gfs170] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
65
|
Montgomery JB, Wichtel JJ, Wichtel MG, McNiven MA, McClure J, Markham F, Horohov DW. The Effects of Selenium Source on Measures of Selenium Status of Mares and Selenium Status and Immune Function of Their Foals. J Equine Vet Sci 2012. [DOI: 10.1016/j.jevs.2011.12.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
|
66
|
Cheng AWM, Bolognesi M, Kraus VB. DIO2 modifies inflammatory responses in chondrocytes. Osteoarthritis Cartilage 2012; 20:440-445. [PMID: 22353746 PMCID: PMC3322270 DOI: 10.1016/j.joca.2012.02.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Revised: 01/07/2012] [Accepted: 02/13/2012] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Selenium neutralizes interleukin-1β (IL-1β) induced inflammatory responses in chondrocytes. We investigated potential mechanisms for this through in vitro knock down of three major selenoproteins, Iodothyronine Deiodinase-2 (DIO2), Glutathione Peroxidase-1 (GPX1), and Thioredoxin Reductase-1 (TR1) in primary human chondrocytes. METHODS Primary human chondrocytes were transfected with scrambled small interfering ribonucleic acid (siRNA) or siRNA specific for DIO2, GPX1 and TR1. After 48 h, transfected cells were cultured in serum free media for 48 h, with or without 10 pg/ml IL-1β for the final 24h. The efficiency of siRNAs was confirmed by quantitative Real Time-Polymerase Chain Reaction (qRT-PCR) and Western blot analysis. The gene expression, by qRT-PCR, of cyclooxygenase-2 (COX2), IL-1β, and Liver X receptor (LXR) alpha and beta was evaluated to determine the impact of selenoprotein knockdown on inflammatory responses in chondrocytes. RESULTS The messenger RNA (mRNA) expression of DIO2, GPX1, and TR1 was significantly decreased by the specific siRNAs (reduced 56%, P=0.0004; 96%, P<0.0001; and 66%, P<0.0001, respectively). Suppression of DIO2, but not GPX1 or TR1, significantly increased (~2-fold) both basal (P=0.0005) and IL-1β induced (P<0.0001) COX2 gene expression. Similarly, suppression of DIO2 significantly increased (∼9-fold) IL-1β induced IL-1β gene expression (P=0.0056) and resulted in a 32% (P=0.0044) decrease in LXRα gene expression but no effect on LXRβ. CONCLUSIONS Suppression of the selenoprotein DIO2 resulted in strong pro-inflammatory effects with increased expression of inflammatory mediators, IL-1β and COX2, and decreased expression of LXRα suggesting that this may be the upstream target through which the anti-inflammatory effects of DIO2 are mediated.
Collapse
Affiliation(s)
- A W M Cheng
- Department of Pathology, Duke University Medical Center, Durham, NC 27710, USA
| | - M Bolognesi
- Department of Surgery, Duke University Medical Center, Durham, NC 27710, USA
| | - V B Kraus
- Department of Medicine, Duke University Medical Center, Durham, NC 27710, USA.
| |
Collapse
|
67
|
Alizadeh M, Safaeiyan A, Ostadrahimi A, Estakhri R, Daneghian S, Ghaffari A, Gargari BP. Effect of L-arginine and selenium added to a hypocaloric diet enriched with legumes on cardiovascular disease risk factors in women with central obesity: a randomized, double-blind, placebo-controlled trial. ANNALS OF NUTRITION AND METABOLISM 2012; 60:157-68. [PMID: 22517293 DOI: 10.1159/000335470] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2011] [Accepted: 11/25/2011] [Indexed: 12/21/2022]
Abstract
BACKGROUND/AIMS We aimed to discover if L-arginine and selenium alone or together can increase the effect of a hypocaloric diet enriched in legumes (HDEL) on central obesity and cardiovascular risk factors in women with central obesity. METHODS This randomized, double-blind, placebo-controlled trial was undertaken in 84 premenopausal women with central obesity. After a 2-week run-in period on an isocaloric diet, participants were randomly assigned to a control diet (HDEL), L-arginine (5 g/day) and HDEL, selenium (200 μg/day) and HDEL or L-arginine, selenium and HDEL for 6 weeks. Cardiovascular risk factors were assessed before intervention and 3 and 6 weeks afterwards. RESULTS After 6 weeks, L-arginine had significantly reduced waist circumference (WC); selenium had significantly lowered fasting concentrations of serum insulin and the homeostasis model assessment of insulin resistance index; the interaction between L-arginine and selenium significantly reduced the fasting concentration of nitric oxides (NO(x)), and HDEL lowered triglycerides (TG) and WC and significantly increased the fasting concentration of NO(x). HDEL reduced high-sensitivity C-reactive protein levels in the first half of the study and returned them to basal levels in the second half. CONCLUSION These data indicate the beneficial effects of L-arginine on central obesity, selenium on insulin resistance and HDEL on serum concentrations of NO(x) and TG.
Collapse
Affiliation(s)
- Mohammad Alizadeh
- Department of Biochemistry and Nutrition, School of Medicine, Urmia University of Medical Sciences, Urmia, Iran
| | | | | | | | | | | | | |
Collapse
|
68
|
Huang Z, Rose AH, Hoffmann PR. The role of selenium in inflammation and immunity: from molecular mechanisms to therapeutic opportunities. Antioxid Redox Signal 2012; 16:705-43. [PMID: 21955027 PMCID: PMC3277928 DOI: 10.1089/ars.2011.4145] [Citation(s) in RCA: 533] [Impact Index Per Article: 44.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Dietary selenium (]Se), mainly through its incorporation into selenoproteins, plays an important role in inflammation and immunity. Adequate levels of Se are important for initiating immunity, but they are also involved in regulating excessive immune responses and chronic inflammation. Evidence has emerged regarding roles for individual selenoproteins in regulating inflammation and immunity, and this has provided important insight into mechanisms by which Se influences these processes. Se deficiency has long been recognized to negatively impact immune cells during activation, differentiation, and proliferation. This is related to increased oxidative stress, but additional functions such as protein folding and calcium flux may also be impaired in immune cells under Se deficient conditions. Supplementing diets with above-adequate levels of Se can also impinge on immune cell function, with some types of inflammation and immunity particularly affected and sexually dimorphic effects of Se levels in some cases. In this comprehensive article, the roles of Se and individual selenoproteins in regulating immune cell signaling and function are discussed. Particular emphasis is given to how Se and selenoproteins are linked to redox signaling, oxidative burst, calcium flux, and the subsequent effector functions of immune cells. Data obtained from cell culture and animal models are reviewed and compared with those involving human physiology and pathophysiology, including the effects of Se levels on inflammatory or immune-related diseases including anti-viral immunity, autoimmunity, sepsis, allergic asthma, and chronic inflammatory disorders. Finally, the benefits and potential adverse effects of intervention with Se supplementation for various inflammatory or immune disorders are discussed.
Collapse
Affiliation(s)
- Zhi Huang
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA
| | | | | |
Collapse
|
69
|
Treatment with Selemax®, a selenium-enriched yeast, ameliorates experimental arthritis in rats and mice. Br J Nutr 2012; 108:1829-38. [DOI: 10.1017/s0007114512000013] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Rheumatoid arthritis (RA) is a chronic inflammatory disease that mainly targets the synovial membrane, cartilage and bone. It affects 1 % of the population and is associated with significant morbidity and increased mortality. Se is an essential trace element with antioxidant properties and the ability to modulate the immune responses. Selemax® is an inactive yeast (Saccharomyces cerevisiae) enriched with organic Se. The aim of the present study was to investigate the effects of Selemax® administration in models of an antigen-induced arthritis (AIA) in C57BL/6 mice, and of an adjuvant-induced arthritis (AdIA) in Holtzman rats. As control, the animals were treated with the same inactivated yeast species that was not enriched for Se. In the AIA model, treatment with different doses of Selemax® (0·01, 0·1, 1 and 10 % added to food) significantly decreased the number of inflammatory cells recruited to the knee cavity, essentially by reducing the number of neutrophils. Levels of proinflammatory cytokines, including TNF-α, IL-1β and chemokine (C-X-C motif) ligand 1/keratinocyte chemoattractant (CXCL1/KC), were also reduced in the peri-articular tissue of mice treated with Selemax® at the tested dose (1 %). In the AdIA model in rats, Selemax® treatment decreased paw oedema and hypernociception. This reduction was associated with inhibition of the influx of proinflammatory cells. Therefore, treatment with Selemax® is associated with amelioration of several inflammatory and functional parameters in models of arthritis, suggesting that this Se-enriched yeast should be evaluated further in patients with RA.
Collapse
|
70
|
Hamdy SM, Latif AKMA, Drees EA, Soliman SM. Prevention of rat breast cancer by genistin and selenium. Toxicol Ind Health 2011; 28:746-57. [DOI: 10.1177/0748233711422732] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Breast cancer is the second leading cause of cancer death among women and the third most common cancer. In this study, we investigated the chemoprevention efficacy of each of soy genistin, selenium or a combination of them against breast cancer. Seventy-five female rats were divided into five groups : control group (I); 7,12-dimethylbenz(a)anthracene (DMBA) group (II); DMBA treated with genistin group (III); DMBA treated with selenium group (IV); and DMBA treated with genistin combined with selenium group (V). The treatments were daily administered for 3 months. There were a significant decrease in body weight and serum total antioxidant, while a significant elevation in serum total sialic acid, carcinoembryonic antigen, prolactin, estradiol, nitric oxide, and malondialdhyde of DMBA injected rats compared with control group. Administration of genistin and selenium was associated with decreasing levels of tumorigenicity, endocrine derangement, and oxidative stress. Formation of breast carcinoma in DMBA-induced rats and abnormal changes were ameliorated in the rats treated with genistin/selenium or genistin alone. Supplementation of genistin alone or with selenium provided antioxidant defense with high-potential chemopreventive activity against DMBA-induced mammary tumors more than selenium alone.
Collapse
Affiliation(s)
- Soha M Hamdy
- Chemistry Department, Faculty of Science, El Fayoum University, El-Fayoum, Egypt
| | | | - Ehab A Drees
- Chemistry Department, Faculty of Science, El Fayoum University, El-Fayoum, Egypt
| | - Sahar M Soliman
- Chemistry Department, Faculty of Science, El Fayoum University, El-Fayoum, Egypt
| |
Collapse
|
71
|
Gong G, Méplan C, Gautrey H, Hall J, Hesketh JE. Differential effects of selenium and knock-down of glutathione peroxidases on TNFα and flagellin inflammatory responses in gut epithelial cells. GENES AND NUTRITION 2011; 7:167-78. [PMID: 22068339 PMCID: PMC3316756 DOI: 10.1007/s12263-011-0256-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/20/2011] [Accepted: 10/14/2011] [Indexed: 12/19/2022]
Abstract
Selenium (Se) is essential for human health. Despite evidence that Se intake affects inflammatory responses, the mechanisms by which Se and the selenoproteins modulate inflammatory signalling, especially in the gut, are not yet defined. The aim of this work was to assess effects of altered Se supply and knock-down of individual selenoproteins on NF-κB activation in gut epithelial cells. Caco-2 cells were stably transfected with gene constructs expressing luciferase linked either to three upstream NF-κB response elements and a TATA box or only a TATA box. TNFα and flagellin activated NF-κB-dependent luciferase activity and increased IL-8 expression. Se depletion decreased expression of glutathione peroxidase1 (GPX1) and selenoproteins H and W and increased TNFα-stimulated luciferase activity, endogenous IL-8 expression and reactive oxygen species (ROS) production. These effects were not mimicked by independent knock-down of either GPX1, selenoprotein H or W; indeed, GPX1 knock-down lowered TNFα-induced NF-κB activation and did not affect ROS levels. GPX4 knock-down decreased NF-κB activation by flagellin but not by TNFα. We hypothesise that Se depletion alters the pattern of expression of multiple selenoproteins that in turn increases ROS and modulates NF-κB activation in epithelial cells, but that the effect of GPX1 knock-down is ROS-independent.
Collapse
Affiliation(s)
- G Gong
- Institute for Cell and Molecular Biosciences, The Medical School, Newcastle University, Framlington Place, Newcastle-upon-Tyne, NE2 4HH, UK
| | | | | | | | | |
Collapse
|
72
|
Weber KT, Bhattacharya SK, Newman KP, Soberman JE, Ramanathan KB, McGee JE, Malik KU, Hickerson WL. Stressor states and the cation crossroads. J Am Coll Nutr 2011; 29:563-74. [PMID: 21677120 DOI: 10.1080/07315724.2010.10719895] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Neurohormonal activation involving the hypothalamic-pituitary-adrenal axis and adrenergic nervous and renin-angiotensin-aldosterone systems is integral to stressor state-mediated homeostatic responses. The levels of effector hormones, depending upon the degree of stress, orchestrate the concordant appearance of hypokalemia, ionized hypocalcemia and hypomagnesemia, hypozincemia, and hyposelenemia. Seemingly contradictory to homeostatic responses wherein the constancy of extracellular fluid would be preserved, upregulation of cognate-binding proteins promotes coordinated translocation of cations to injured tissues, where they participate in wound healing. Associated catecholamine-mediated intracellular cation shifts regulate the equilibrium between pro-oxidants and antioxidant defenses, a critical determinant of cell survival. These acute and chronic stressor-induced iterations in extracellular and intracellular cations are collectively referred to as the cation crossroads. Intracellular cation shifts, particularly excessive accumulation of Ca2+, converge on mitochondria to induce oxidative stress and raise the opening potential of their inner membrane permeability transition pores (mPTPs). The ensuing loss of cationic homeostasis and adenosine triphosphate (ATP) production, together with osmotic swelling, leads to organellar degeneration and cellular necrosis. The overall impact of iterations in extracellular and intracellular cations and their influence on cardiac redox state, cardiomyocyte survival, and myocardial structure and function are addressed herein.
Collapse
Affiliation(s)
- Karl T Weber
- Division of Cardiovascular Diseases, University of Tennessee Health Science Center, 956 Court Ave., Suite A312, Memphis, TN 38163, USA.
| | | | | | | | | | | | | | | |
Collapse
|
73
|
Nelson SM, Lei X, Prabhu KS. Selenium levels affect the IL-4-induced expression of alternative activation markers in murine macrophages. J Nutr 2011; 141:1754-61. [PMID: 21775527 PMCID: PMC3159059 DOI: 10.3945/jn.111.141176] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Selenium (Se), in the form of selenoproteins, imparts many health benefits with antiinflammatory properties. Previous studies have shown that Se supplementation of macrophages negatively regulates the LPS-dependent production of inducible NO synthase (iNOS), a proinflammatory gene. Therefore, we hypothesized that l-arginine, a substrate for iNOS, is acted upon by arginase-I (Arg-I), contributing to the resolution of inflammation. We investigated the antiinflammatory activity of Se using LPS and IL-4-treated C57BL/6 murine bone marrow-derived macrophages (BMDM) from mice fed Se-deficient and Se-adequate diets. Supplementation with Se (100 nmol/L) of IL-4-treated macrophages significantly increased the expression of alternatively activated macrophage (M2) markers, Arg-I, Fizz1, and Mrc-1. Se treatment also increased the enzymatic activity of Arg-I and surface expression of Mrc-1. Conversely, expression of classically activated macrophage (M1) markers, TNFα, and IL-1β, was significantly decreased in LPS-treated macrophages that were cultured in Se and IL-4, suggesting a synergistic effect between Se and IL-4. Additionally, Arg-I activity was decreased in BMDM harvested from glutathione peroxidase (GPX) knockout mice compared to GPX wild-type mice, further establishing an important role for selenoproteins. Furthermore, BMDM treated with inhibitors of PPARγ and STAT6, pivotal transcription factors that mediate the activity of Se and IL-4, respectively, showed complete ablation of Se-dependent expression of M2 markers. In summary, these studies suggest that Se supplementation of macrophages produces endogenous activators to mediate the PPARγ-dependent switch from M1 to M2 phenotype in the presence of IL-4, possibly affecting pathways of wound healing and inflammation resolution.
Collapse
Affiliation(s)
- Shakira M. Nelson
- Graduate Program in Pathobiology, Center for Molecular Immunology and Infectious Disease and Center for Molecular Toxicology and Carcinogenesis, Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA
| | - Xingen Lei
- Department of Animal Sciences, Cornell University, Ithaca, NY
| | - K. Sandeep Prabhu
- Graduate Program in Pathobiology, Center for Molecular Immunology and Infectious Disease and Center for Molecular Toxicology and Carcinogenesis, Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA,To whom correspondence should be addressed. E-mail:
| |
Collapse
|
74
|
Georgieva NV, Stoyanchev K, Bozakova N, Jotova I. Combined effects of muscular dystrophy, ecological stress, and selenium on blood antioxidant status in broiler chickens. Biol Trace Elem Res 2011; 142:532-45. [PMID: 20668960 DOI: 10.1007/s12011-010-8782-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2010] [Accepted: 07/15/2010] [Indexed: 12/19/2022]
Abstract
The results obtained in this study demonstrated that experimentally induced alimentary muscular dystrophy (MD) in Cobb 500 broiler chickens resulted in increased plasma concentrations of malondialdehyde (MDA), deviations in activities of erythrocyte antioxidant enzymes Cu,Zn-SOD (decrease), and CAT (increase) as well as reduction in plasma concentrations of trace elements Cu, Zn, and Se in affected birds. These data evidenced the presence of oxidative stress in birds with MD, reared both under conditions of ecological comfort and ecological stress. The increased MDA and САТ levels and the reduced Cu,Zn-SOD, Cu, Zn, and Se concentrations in healthy chickens reared under unfavorable microclimatic conditions such as higher air temperature and humidity, higher ammonia concentrations, and lower light intensity were indicative about an induced ecological stress. After the 10-day oral treatment with a selenium-containing preparation, the levels of MDA, Cu,Zn-SOD, CAT, Cu, Zn, and Se attained their normal values in chickens with MD, reared under ecologically comfortable conditions. According to our results, ecological stress was shown to exert independently a significant adverse effect upon the levels of the studied parameters and possibly to be a cause for their slower and not complete normalization despite the selenium therapy in experimental broiler chickens.
Collapse
Affiliation(s)
- Nedyalka V Georgieva
- Department of Pharmacology, Physiology of Animals and Physiologic Chemistry, Faculty of Veterinary Medicine, Trakia University, Student's Campus, 6000 Stara Zagora, Bulgaria.
| | | | | | | |
Collapse
|
75
|
Oxidative Stress and Cardiomyocyte Necrosis With Elevated Serum Troponins: Pathophysiologic Mechanisms. Am J Med Sci 2011; 342:129-34. [DOI: 10.1097/maj.0b013e3182231ee3] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
76
|
Gandhi UH, Kaushal N, Ravindra KC, Hegde S, Nelson SM, Narayan V, Vunta H, Paulson RF, Prabhu KS. Selenoprotein-dependent up-regulation of hematopoietic prostaglandin D2 synthase in macrophages is mediated through the activation of peroxisome proliferator-activated receptor (PPAR) gamma. J Biol Chem 2011; 286:27471-82. [PMID: 21669866 DOI: 10.1074/jbc.m111.260547] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
The plasticity of macrophages is evident from their dual role in inflammation and resolution of inflammation that are accompanied by changes in the transcriptome and metabolome. Along these lines, we have previously demonstrated that the micronutrient selenium increases macrophage production of arachidonic acid (AA)-derived anti-inflammatory 15-deoxy-Δ(12,14)-prostaglandin J(2) (15d-PGJ(2)) and decreases the proinflammatory PGE(2). Here, we hypothesized that selenium modulated the metabolism of AA by a differential regulation of various prostaglandin (PG) synthases favoring the production of PGD(2) metabolites, Δ(12)-PGJ(2) and 15d-PGJ(2). A dose-dependent increase in the expression of hematopoietic-PGD(2) synthase (H-PGDS) by selenium and a corresponding increase in Δ(12)-PGJ(2) and 15d-PGJ(2) in RAW264.7 macrophages and primary bone marrow-derived macrophages was observed. Studies with organic non-bioavailable forms of selenium and the genetic manipulation of cellular selenium incorporation machinery indicated that selenoproteins were necessary for H-PGDS expression and 15d-PGJ(2) production. Treatment of selenium-deficient macrophages with rosiglitazone, a peroxisome proliferator-activated receptor γ ligand, up-regulated H-PGDS. Furthermore, electrophoretic mobility shift assays indicated the presence of an active peroxisome proliferator-activated receptor-response element in murine Hpgds promoter suggesting a positive feedback mechanism of H-PGDS expression. Alternatively, the expression of nuclear factor-κB-dependent thromboxane synthase and microsomal PGE(2) synthase was down-regulated by selenium. Using a Friend virus infection model of murine leukemia, the onset of leukemia was observed only in selenium-deficient and indomethacin-treated selenium-supplemented mice but not in the selenium-supplemented group or those treated with 15d-PGJ(2). These results suggest the importance of selenium in the shunting of AA metabolism toward the production of PGD(2) metabolites, which may have clinical implications.
Collapse
Affiliation(s)
- Ujjawal H Gandhi
- Graduate Program in Molecular Toxicology, Center for Molecular Immunology and Infectious Disease, Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
77
|
Gandhi MS, Kamalov G, Shahbaz AU, Bhattacharya SK, Ahokas RA, Sun Y, Gerling IC, Weber KT. Cellular and molecular pathways to myocardial necrosis and replacement fibrosis. Heart Fail Rev 2011; 16:23-34. [PMID: 20405318 DOI: 10.1007/s10741-010-9169-3] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Fibrosis is a fundamental component of the adverse structural remodeling of myocardium present in the failing heart. Replacement fibrosis appears at sites of previous cardiomyocyte necrosis to preserve the structural integrity of the myocardium, but not without adverse functional consequences. The extensive nature of this microscopic scarring suggests cardiomyocyte necrosis is widespread and the loss of these contractile elements, combined with fibrous tissue deposition in the form of a stiff in-series and in-parallel elastic elements, contributes to the progressive failure of this normally efficient muscular pump. Cellular and molecular studies into the signal-transducer-effector pathway involved in cardiomyocyte necrosis have identified the crucial pathogenic role of intracellular Ca2+ overloading and subsequent induction of oxidative stress, predominantly confined within its mitochondria, to be followed by the opening of the mitochondrial permeability transition pore that leads to the destruction of these organelles and cells. It is now further recognized that Ca2+ overloading of cardiac myocytes and mitochondria serves as a prooxidant and which is counterbalanced by an intrinsically coupled Zn2+ entry serving as antioxidant. The prospect of raising antioxidant defenses by increasing intracellular Zn2+ with adjuvant nutriceuticals can, therefore, be preferentially exploited to uncouple this intrinsically coupled Ca2+ - Zn2+ dyshomeostasis. Hence, novel yet simple cardioprotective strategies may be at hand that deserve to be further explored.
Collapse
Affiliation(s)
- Malay S Gandhi
- Division of Cardiovascular Diseases, Department of Medicine, University of Tennessee Health Science Center, 956 Court Ave., Suite A312, Memphis, TN 38163, USA
| | | | | | | | | | | | | | | |
Collapse
|
78
|
Borkowski BJ, Cheema Y, Shahbaz AU, Bhattacharya SK, Weber KT. Cation dyshomeostasis and cardiomyocyte necrosis: the Fleckenstein hypothesis revisited. Eur Heart J 2011; 32:1846-53. [PMID: 21398641 DOI: 10.1093/eurheartj/ehr063] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
An ongoing loss of cardiomyocytes to apoptotic and necrotic cell death pathways contributes to the progressive nature of heart failure. The pathophysiological origins of necrotic cell loss relate to the neurohormonal activation that accompanies acute and chronic stressor states and which includes effector hormones of the adrenergic nervous system. Fifty years ago, Albrecht Fleckenstein and coworkers hypothesized the hyperadrenergic state, which accompanies such stressors, causes cardiomyocyte necrosis based on catecholamine-initiated excessive intracellular Ca(2+) accumulation (EICA), and mitochondrial Ca(2+) overloading in particular, in which the ensuing dysfunction and structural degeneration of these organelles leads to necrosis. In recent years, two downstream factors have been identified which, together with EICA, constitute a signal-transducer-effector pathway: (i) mitochondria-based induction of oxidative stress, in which the rate of reactive oxygen metabolite generation exceeds their rate of detoxification by endogenous antioxidant defences; and (ii) the opening of the mitochondrial inner membrane permeability transition pore (mPTP) followed by organellar swelling and degeneration. The pathogenesis of stress-related cardiomyopathy syndromes is likely related to this pathway. Other factors which can account for cytotoxicity in stressor states include: hypokalaemia; ionized hypocalcaemia and hypomagnesaemia with resultant elevations in parathyroid hormone serving as a potent mediator of EICA; and hypozincaemia with hyposelenaemia, which compromise antioxidant defences. Herein, we revisit the Fleckenstein hypothesis of EICA in leading to cardiomyocyte necrosis and the central role played by mitochondria.
Collapse
Affiliation(s)
- Brian J Borkowski
- Division of Cardiovascular Diseases, University of Tennessee Health Science Center, 956 Court Ave., Suite A312, Memphis, TN 38162, USA
| | | | | | | | | |
Collapse
|
79
|
Abstract
Despite today's standard of care, aimed at preventing homeostatic neurohormonal activation, one in every five patients recently hospitalized with congestive heart failure (CHF) will be readmitted within 30 days of discharge because of a recurrence of their symptoms and signs. In light of recent pathophysiological insights, it is now propitious to revisit CHF with a view toward complementary and evolving management strategies. CHF is a progressive systemic illness. Its features include: oxidative stress in diverse tissues; an immunostimulatory state with circulating proinflammatory cytokines; a wasting of soft tissues; and a resorption of bone. Its origins are rooted in homeostatic mechanisms gone awry to beget dyshomeostasis. For example, marked excretory losses of Ca2+ and Mg2+ accompany renin-angiotensin-aldosterone system activation, causing ionized hypocalcemia and hypomagnesemia that lead to secondary hyperparathyroidism with consequent bone resorption and a propensity to atraumatic fractures. Parathyroid hormone accounts for paradoxical intracellular Ca2+ overloading in diverse tissues and consequent systemic induction of oxidative stress. In cardiac myocytes and mitochondria, these events orchestrate opening of the mitochondrial permeability transition pore with an ensuing osmotic-based destruction of these organelles and resultant cardiomyocyte necrosis with myocardial scarring. Contemporaneous with Ca2+ and Mg2+ dyshomeostasis is hypozincemia and hyposelenemia, which compromise metalloenzyme-based antioxidant defenses, whereas hypovitaminosis D threatens Ca2+ stores needed to prevent secondary hyperparathyroidism. An intrinsically coupled dyshomeostasis of intracellular Ca2+ and Zn2+, representing pro-oxidant and antioxidant, respectively, is integral to regulating the mitochondrial redox state; it can be uncoupled by a Zn2+ supplement in favor of antioxidant defenses. Hence, the complementary use of nutriceuticals to nullify dyshomeostatic responses involving macro- and micronutrients should be considered. Evolving strategies with mitochondria-targeted interventions interfering with their uptake of Ca2+ or serving as selective antioxidant or mitochondrial permeability transition pore inhibitor may also prove efficacious in the overall management of CHF.
Collapse
|
80
|
Cheng AWM, Stabler TV, Bolognesi M, Kraus VB. Selenomethionine inhibits IL-1β inducible nitric oxide synthase (iNOS) and cyclooxygenase 2 (COX2) expression in primary human chondrocytes. Osteoarthritis Cartilage 2011; 19:118-25. [PMID: 21035557 PMCID: PMC3053078 DOI: 10.1016/j.joca.2010.10.019] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2010] [Revised: 08/27/2010] [Accepted: 10/18/2010] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Several lines of evidence show that selenium (Se) has potential protective effects in osteoarthritis (OA), however the exact mechanism is still unclear. As interleukin-1β (IL-1β) is one of the key proinflammatory cytokines contributing to the progression in OA, we investigated the effect of Se in neutralizing the inflammatory effects of IL-1β on nitric oxide (NO) and prostaglandin E₂ (PGE₂) production, and the signaling pathways involved. METHODS Isolated primary human chondrocytes were pretreated with selenomethionine (SeMet) (0.5 μM SeMet) for 24 h then co-treated without or with IL-1β (10 pg/ml or 50 pg/ml) for another 24 h followed by RNA isolation. Gene expression of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX2) was determined by quantitative Real Time-Polymerase Chain Reaction. Culture media concentrations of NO and PGE₂ were determined by nitrite (NO₂⁻) assay and immunoassay respectively. For analysis of cell signaling pathways, chondrocytes were pretreated with SeMet then stimulated with IL-1β for 0-45 min. The activity of IL-1β signaling pathways was determined by Western blot screening of phosphorylation states of signal transduction proteins. RESULTS SeMet inhibited chondrocyte gene expression of IL-1β induced iNOS (31-54%, P=0.031) and COX2 (50-65%, P=0.031) with corresponding reductions in both NO (19-47%, P=0.031) and PGE₂ (24-32%, P=0.031) production. Pretreatment with SeMet attenuated IL-1β induced activation of p38 MAPK (39%, P=0.039) but not the extracellular signal-regulated kinase pathways (ERK) 1/2, c-Jun N-terminal kinases (JNK) or nuclear factor κB (NFκB). CONCLUSIONS This study elucidates one potential protective mechanism of Se, namely through the alteration of cell signaling and downstream transcription of pro-inflammatory effects of IL-1β.
Collapse
Affiliation(s)
| | - Thomas V. Stabler
- Department of Medicine, Duke University Medical Center, Durham, NC 27710
| | - Michael Bolognesi
- Department of Surgery, Duke University Medical Center, Durham, NC 27710
| | | |
Collapse
|
81
|
Shaheen M, Cheema Y, Shahbaz AU, Bhattacharya SK, Weber KT. Intracellular calcium overloading and oxidative stress in cardiomyocyte necrosis via a mitochondriocentric signal-transducer-effector pathway. Exp Clin Cardiol 2011; 16:109-15. [PMID: 22131852 PMCID: PMC3206102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2011] [Accepted: 06/30/2011] [Indexed: 05/31/2023]
Abstract
Congestive heart failure (CHF), a common clinical syndrome, has reached epidemic proportions. Its disabling symptoms account for frequent hospitalizations and readmissions. Pathophysiological mechanisms that lead to CHF and account for its progressive nature are of considerable interest. Important scientific observations obtained from Dr Pawan K Singal's laboratory in Winnipeg, Manitoba, have provided crucial insights to our understanding of the pathophysiological factors that contribute to cardiomyocyte necrosis (the heart is a postmitotic organ incapable of tolerating an ongoing loss of these cells without adverse functional consequences). This increment in knowledge and the mechanistic insights afforded by Dr Singal and his colleagues have highlighted the role of excessive intracellular calcium accumulation and the appearance of oxidative stress in CHF, in which the rate of reactive oxygen species generation overwhelms their rate of detoxification by antioxidant defenses. They have shown that this common pathophysiological scenario applies to diverse entities such as ischemia/reperfusion and hypoxia/reoxygenation forms of injury, myocardial infarction and the cardiomyopathies that accompany diabetes and excess levels of catecholamines and adriamycin. The authors are honoured to be invited to contribute to the present focus issue of Experimental & Clinical Cardiology in recognizing Dr Singal's numerous scholarly accomplishments. The present article reviews the authors' recent work on a mitochondriocentric signal-transducer-effector pathway to cardiomyocyte necrosis found in rats with either an acute stressor state that accompanies isoproterenol administration or a chronic stressor state manifested after four weeks of aldosterone/salt treatment.
Collapse
Affiliation(s)
- Mazen Shaheen
- Division of Cardiovascular Diseases, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Yaser Cheema
- Division of Cardiovascular Diseases, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Atta U Shahbaz
- Division of Cardiovascular Diseases, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Syamal K Bhattacharya
- Division of Cardiovascular Diseases, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Karl T Weber
- Division of Cardiovascular Diseases, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| |
Collapse
|
82
|
Panicker S, Swathy SS, John F, Madambath I. Impact of selenium on NFκB translocation in isoproterenol-induced myocardial infarction in rats. Biol Trace Elem Res 2010; 138:202-11. [PMID: 20107922 DOI: 10.1007/s12011-009-8597-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2009] [Accepted: 12/16/2009] [Indexed: 10/19/2022]
Abstract
NFκB is a major transcription factor that controls the expression of various genes. Its activation is a complex process that can be triggered by many agents and one among them is reactive oxygen species. The aim of this study was to investigate the effect of selenium on NFκB activation in rats induced with myocardial infarction by isoproterenol (ISP). The markers of myocardial infarction showed increased activity in the serum of rats induced with ISP compared to the group that was pretreated with selenium along with ISP. Cellular selenium status was also found to be very low in the ISP-induced group of rats. The concentration of cytosolic NFκB was comparatively lower in the ISP group than in the group treated with selenium and ISP. Whereas higher levels of NFκB were found in the nuclear extract of the ISP-treated animals than in the selenium + ISP group. Elevated levels of malondialdehyde, hydroperoxides, and conjugated diens in the ISP-treated rats revealed the higher levels of oxidative stress in this group. Thus, our studies reveal the inhibitory effect of selenium in the nuclear translocation of NFκB during myocardial infarction. Histopathological studies of the heart also support the cardioprotective role of selenium.
Collapse
Affiliation(s)
- Seema Panicker
- Department of Biochemistry, University of Kerala, Kariavattom, Thiruvananthapuram, India
| | | | | | | |
Collapse
|
83
|
Alizadeh M, Daneghian S, Ghaffari A, Ostadrahimi A, Safaeiyan A, Estakhri R, Gargari BP. The effect of hypocaloric diet enriched in legumes with or without L-arginine and selenium on anthropometric measures in central obese women. JOURNAL OF RESEARCH IN MEDICAL SCIENCES : THE OFFICIAL JOURNAL OF ISFAHAN UNIVERSITY OF MEDICAL SCIENCES 2010; 15:331-43. [PMID: 21526106 PMCID: PMC3082837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/18/2010] [Accepted: 07/21/2010] [Indexed: 11/05/2022]
Abstract
BACKGROUND Identifying new ways to decrease adiposity will be very valuable for health. The aim of this study was to find out whether L-Arginine (Arg) and selenium alone or together can increase the effect of hypocaloric diet enriched in legumes (HDEL) on anthropometric measures in healthy obese women. METHODS This randomized, double-blind, placebo-controlled trial was undertaken in 84 healthy premenopausal women with central obesity. After 2 weeks of run-in on an isocaloric diet, participants were randomly considered to eat HDEL, Arg (5 g/d) and HDEL, selenium (200 µg/d) and HDEL or Arg, selenium and HDEL for 6 weeks. The following variables were assessed before intervention and 3 and 6 weeks after it: weight, waist circumference, hip circumference, waist to hip ratio (WHR), body mass index (BMI), and fasting nitrite/nitrate (NO(x)) concentrations. Other variables (arm, thigh, calf and breast circumferences, subscapular, triceps, biceps and suprailiac skinfold thicknesses, sum of skinfold thicknesses (SSF), body density (D) and estimated percent of body fat (EPF)) were assessed before and after intervention. RESULTS HDEL showed a significant effect in reduction of waist, hip, arm, thigh, calf and breast circumferences, triceps, biceps, subscapular and suprailiac skinfold thicknesses, WHR, SSF, D and EPF. HDEL + Arg + selenium significantly reduced suprailiac skinfold thicknesses; and there was no significant effect of HDEL, Arg, selenium and Arg plus selenium on weight, BMI and fasting NO(x). CONCLUSIONS The study indicates that HDEL + Arg + selenium reduce suprailiac skinfold thicknesses which represents the abdominal obesity reduction.
Collapse
Affiliation(s)
- Mohammad Alizadeh
- Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Sevana Daneghian
- Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Aida Ghaffari
- Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Alireza Ostadrahimi
- Nutrition Research Center, Department of Nutrition, Faculty of Health and Nutrition, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Abdolrasoul Safaeiyan
- Department of Vital Statistics and Epidemiology, Faculty of Health and Nutrition, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Rassul Estakhri
- Liver and Gastrointestinal Disease Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Bahram Pourghasem Gargari
- Nutrition Research Center, Department of Nutrition, Faculty of Health and Nutrition, Tabriz University of Medical Sciences, Tabriz, Iran,* Corresponding Author E-mail:
| |
Collapse
|
84
|
Lee JH, Jeong CS. Suppressive effects on the biosynthesis of inflammatory mediators by Aralia elata extract fractions in macrophage cells. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2009; 28:333-341. [PMID: 21784024 DOI: 10.1016/j.etap.2009.05.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2008] [Revised: 05/12/2009] [Accepted: 05/13/2009] [Indexed: 05/31/2023]
Abstract
The aim of this study is to elucidate the anti-inflammatory effects of Aralia elata extract fractions (AEEFs). A. elata-ethyl acetate fraction (AEEF) had the strongest antioxidant activity. A. elata-chloroform fraction (AECF) and A. elata-butanol fraction (AEBF) inhibited potently LPS-induced nitrite production from RAW 264.7 macrophage cells. The inhibition of nitric oxide (NO) production by AEEFs was partially due to chemical scavenge of NO and the suppression of inducible NOS (iNOS) transcription level in LPS-induced macrophage cells. In addition, AEEFs inhibited significantly the biosynthesis of Prostaglandin E(2) (PGE(2)), and cyclooxygenase-2, which regulates the synthesis of PGE(2), was attenuated partially by the treatment of AEEFs in LPS-induced macrophage cells. Also, A. elata-methanolic extract (AEME) suppressed remarkably IL-1β and IL-6 level to the basal (more than 99% inhibition) in concentration-dependant manners. Its anti-inflammatory actions might be related with inhibition of NF-κB activation in LPS-stimulated macrophage cells. It is concluded that AEEFs may be useful as a functional food material and an alternative medicine for the relief and retardation of immunological inflammatory responses.
Collapse
Affiliation(s)
- Je-Hyuk Lee
- Plant Resources Research Institute, Duksung Women's University, Seoul 132-714, Republic of Korea
| | | |
Collapse
|
85
|
Pei Z, Li H, Guo Y, Jin Y, Lin D. Sodium selenite inhibits the expression of VEGF, TGFbeta(1) and IL-6 induced by LPS in human PC3 cells via TLR4-NF-(K)B signaling blockage. Int Immunopharmacol 2009; 10:50-6. [PMID: 19811770 DOI: 10.1016/j.intimp.2009.09.020] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2009] [Revised: 09/02/2009] [Accepted: 09/25/2009] [Indexed: 01/17/2023]
Abstract
Lipopolysaccharide (LPS)-induced TLR4-NF-(K)B signaling plays an important role in the development of prostatic tumors from chronic bacterial prostatic infection. Although many studies support the role of selenium in protecting against the development of prostate cancer secondary to chronic prostatitis, the mechanism of action remains unclear. The aim of our study was to investigate whether selenium inhibits the LPS-induced TLR4 signaling pathway in human prostate cancer PC3 cells. Using real-time quantitative PCR and ELISA analysis, we found that pretreatment with selenium (0.5-5uM) inhibited the LPS-induced expression of TGFbeta(1) and VEGF and production of these cytokines and IL-6 by PC3 cells, but did not alter the expression of TLR4 mRNA. Further experiments using Western blot showed that selenium at 3 and 5uM significantly inhibited the translocation of the NF-(K)B p65 subunit to the nucleus in LPS-stimulated PC3 cells. Our results suggest that low doses of selenium may protect the prostate from prostatitis-induced cancer by inhibiting nuclear translocation of the NF-(K)B and the subsequent production of the immunosuppressive cytokine TGFbeta(1), proangiogenic factor VEGF and pro-inflammatory factor IL-6.
Collapse
Affiliation(s)
- Zengyang Pei
- College of Veterinary Medicine, China Agricultural University, Beijing, China
| | | | | | | | | |
Collapse
|
86
|
Chen YC, Sosnoski DM, Gandhi UH, Novinger LJ, Prabhu KS, Mastro AM. Selenium modifies the osteoblast inflammatory stress response to bone metastatic breast cancer. Carcinogenesis 2009; 30:1941-8. [PMID: 19759193 DOI: 10.1093/carcin/bgp227] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Breast cancer frequently metastasizes to the skeleton resulting in bone degradation due to osteoclast activation. Metastases also downregulate differentiation and the bone-rebuilding function of osteoblasts. Moreover, cancer cells trigger osteoblast inflammatory stress responses. Pro-inflammatory mediators such as interleukin (IL)-6, monocyte chemoattractant protein-1 (MCP-1), cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS), expressed by osteoblasts (MC3T3-E1) stimulated with human breast cancer cell (MDA-MB-231) conditioned medium, are pivotal to osteoclast activation and metastasis. Given that these genes are regulated by nuclear factor-kappaB (NF-kappaB), a redox-sensitive transcription factor, we hypothesized that selenium (Se) could abrogate the inflammatory response to metastatic breast cancer cells by modulating NF-kappaB. Caffeic acid phenethyl ester and parthenolide inhibited NF-kappaB activation, as seen by gel shift assays and immunoblotting for p65 in nuclear fractions, as well as decreased production of IL-6 and MCP-1. Supplementation of MC3T3-E1 with methylseleninic acid (MSA) (0.5 microM to 4 microM) reduced the activation of NF-kappaB leading to a decrease in IL-6, MCP-1, COX-2 and iNOS in response to MDA-MB-231 conditioned medium. Addition of MSA to osteoblasts for as little as 15 min suppressed activation of NF-kappaB suggesting that short-lived active metabolites might be involved. However, brief exposure to MSA also brought about an increase in selenoprotein glutathione peroxidase 1. In summary, our data indicate that the osteoblast response to metastatic breast cancer cells is regulated by NF-kappaB activation, which can be effectively suppressed by MSA either through short-lived active metabolites and/or selenoproteins. Thus, Se supplementation may prevent the osteoblast inflammatory response or dampen the vicious cycle established when breast cancer cells, osteoblasts and osteoclasts interact.
Collapse
Affiliation(s)
- Yu-Chi Chen
- Department of Biochemistry and Molecular Biology, 431 South Frear Building, Penn State University, University Park, PA 16802, USA
| | | | | | | | | | | |
Collapse
|
87
|
Wang X, Zhao Q, Matta R, Meng X, Liu X, Liu CG, Nelin LD, Liu Y. Inducible nitric-oxide synthase expression is regulated by mitogen-activated protein kinase phosphatase-1. J Biol Chem 2009; 284:27123-34. [PMID: 19651781 DOI: 10.1074/jbc.m109.051235] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Inducible nitric-oxide (NO) synthase (iNOS) plays a critical role in the eradication of intracellular pathogens. However, the excessive production of NO by iNOS has also been implicated in the pathogenesis of septic shock syndrome. Previously, we have demonstrated that mice deficient in mitogen-activated protein kinase phosphatase-1 (MKP-1) exhibit exaggerated inflammatory responses and rapidly succumb to lipopolysaccharide (LPS). In response to LPS, MKP-1(-/-) mice produce greater amounts of inflammatory cytokines and NO than do wild-type mice, and the MKP-1(-/-) mice exhibit severe hypotension. To understand the molecular basis for the increase in NO production, we studied the role of MKP-1 in the regulation of iNOS expression. We found that LPS challenge elicited a stronger iNOS induction in MKP-1 knock-out mice than in wild-type mice. Likewise, LPS treatment also resulted in greater iNOS expression in macrophages from MKP-1(-/-) mice than in macrophages from wild-type mice. Both accelerated gene transcription and enhanced mRNA stability contribute to the increases in iNOS expression in LPS-stimulated MKP-1(-/-) macrophages. We found that STAT-1, a transcription factor known to mediate iNOS induction by interferon-gamma, was more potently activated by LPS in MKP-1(-/-) macrophages than in wild-type cells. MicroRNA array analysis indicated that microRNA (miR)-155 expression was increased in MKP-1-deficient macrophages compared with wild-type macrophages. Transfection of miR-155 attenuated the expression of Suppressor of Cytokine Signal (SOCS)-1 and enhanced the expression of iNOS. Our results suggest that MKP-1 may negatively regulate iNOS expression by controlling the expression of miR-155 and consequently the STAT pathway via SOCS-1.
Collapse
Affiliation(s)
- Xianxi Wang
- Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Department of Pediatrics, The Ohio State University College of Medicine, Columbus, Ohio 43205, USA
| | | | | | | | | | | | | | | |
Collapse
|
88
|
Abstract
Selenoproteins are proteins containing selenium in the form of the 21st amino acid, selenocysteine. Members of this protein family have many diverse functions, but their synthesis is dependent on a common set of cofactors and on dietary selenium. Although the functions of many selenoproteins are unknown, several disorders involving changes in selenoprotein structure, activity or expression have been reported. Selenium deficiency and mutations or polymorphisms in selenoprotein genes and synthesis cofactors are implicated in a variety of diseases, including muscle and cardiovascular disorders, immune dysfunction, cancer, neurological disorders and endocrine function. Members of this unusual family of proteins have roles in a variety of cell processes and diseases.
Collapse
|
89
|
Sreekala S, Indira M. Effects of exogenous selenium on nicotine-induced oxidative stress in rats. Biol Trace Elem Res 2009; 130:62-71. [PMID: 19224138 DOI: 10.1007/s12011-009-8314-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2008] [Accepted: 01/05/2009] [Indexed: 11/25/2022]
Abstract
The effect of two different doses of selenium [1 and 50 microg selenium/100 g body weight (wt)] on nicotine-induced oxidative damage in liver was investigated in experimental rats. Male albino rats were maintained for 60 days as follows: (1) control group (normal diet), (2) nicotine group (0.6 mg/kg body wt)/day, (3) high-dose selenium (50 microg/100 g body wt)/day, (4) high-dose selenium (50 microg/100 g body wt) + nicotine (0.6 mg/kg body wt)/day, (5) low-dose selenium (1 microg/100 g body wt)/day, and (6) low-dose selenium (1 microg/100 g body wt) + nicotine (0.6 mg/kg body wt)/day. Nicotine administration caused a decrease in the activity of antioxidant enzymes, an increase in the concentration of lipid peroxidation products and protein carbonyls and an increase in the activity of nitric oxide synthase compared to the control group. Coadministration of nicotine and selenium reduced the concentration of lipid peroxidation products and increased the activity of antioxidant enzymes compared to the nicotine group. Selenium also enhanced the metabolism of nicotine. The antioxidant effect was more significant in the group administered a low dose of selenium.
Collapse
|
90
|
Wang YH, Du GH. Ginsenoside Rg1 inhibits beta-secretase activity in vitro and protects against Abeta-induced cytotoxicity in PC12 cells. JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 2009; 11:604-612. [PMID: 20183297 DOI: 10.1080/10286020902843152] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Ginsenoside Rg1 (1) is a major active component of Panax notoginseng, a Chinese herb widely used in traditional Chinese medicine to improve learning and memory function. Increasing evidence suggests that beta-amyloid peptide (Abeta) plays a central role in the pathophysiology of Alzheimer's disease (AD). To elucidate the mechanism of 1 on improving the ability of learning and memory, we investigated whether 1 could affect Abeta generation or protect Abeta-induced neurotoxicity. The results showed that 1 could inhibit beta-secretase activity in vitro and also protect the PC12 cells against injuries caused by exposure of PC12 cells to 50 microM Abeta(25-35) for 48 h. The cell death, LDH release, NO release, ROS production, lipid peroxidation, intracellular calcium elevation, and apoptosis are associated events induced by Abeta that can be rescued by 1 in PC12 cells. In conclusion, 1 may be a promising agent for AD, and the mechanism is related to beta-secretase inhibition and protection against Abeta-induced cytotoxicity.
Collapse
Affiliation(s)
- Yue-Hua Wang
- Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | | |
Collapse
|
91
|
Imen JS, Billiet L, Cuaz-Pérolin C, Michaud N, Rouis M. The regulated in development and DNA damage response 2 (REDD2) gene mediates human monocyte cell death through a reduction in thioredoxin-1 expression. Free Radic Biol Med 2009; 46:1404-10. [PMID: 19268525 DOI: 10.1016/j.freeradbiomed.2009.02.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/16/2008] [Revised: 02/23/2009] [Accepted: 02/23/2009] [Indexed: 11/24/2022]
Abstract
In a previous study, we identified the regulated in development and DNA damage response 2 (REDD2) gene as a highly expressed gene in human atherosclerotic lesions in comparison to normal artery, as well as in cultured human macrophages, and showed its implication in oxidized low-density lipoprotein (LDL)-induced macrophage death sensitivity. In this article, we attempt to identify the mechanism by which REDD2 induces such a phenomenon. Transient transfection of U-937 monocytic cells with a pCI.CMV.REDD2 expression vector increased by approximately twofold the mRNA levels of REDD2 in comparison to control cells transfected with pCI.CMV.GFP. Reactive oxygen species (ROS) production was significantly induced in REDD2-transfected cells compared with control cells (157+/-48 and 100+/-8 arbitrary units/mg cell protein, respectively; p<0.05). Moreover, a significant increase in parameters known to reflect the oxidative modifications of LDL was observed. Among enzymes involved in ROS production or degradation, we found a specific reduction in thioredoxin-1 (Trx-1) mRNA ( approximately 52+/-7% decrease, p<0.01 vs control cells) and protein ( approximately 60+/-4% decrease, p<0.001 vs control cells) levels in cells overexpressing REDD2 in comparison to control cells. In contrast, transfection of U-937 cells with siRNA against REDD2 decreased the mRNA levels of REDD2 by approximately 60% and increased Trx-1 mRNA and protein levels. Moreover, we observed no or a moderate increase in Bax (proapoptotic) and a significant decrease in Bcl2 (antiapoptotic) gene expression in cells that overexpress REDD2 compared to control cells. In addition, we showed that Trx-1 mRNA and protein levels were increased at low H(2)O(2) doses and decreased at higher doses. Interestingly, macrophages isolated from human atherosclerotic lesions differentially express REDD2 and Trx-1. Indeed, in certain patients, levels of REDD2 mRNA were low and those of Trx-1 mRNA were high. In contrast, in other patients, levels of REDD2 were high and levels of Trx-1 mRNA were low.
Collapse
|
92
|
Lu J, Zhong L, Lönn ME, Burk RF, Hill KE, Holmgren A. Penultimate selenocysteine residue replaced by cysteine in thioredoxin reductase from selenium-deficient rat liver. FASEB J 2009; 23:2394-402. [PMID: 19351701 DOI: 10.1096/fj.08-127662] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Selenium is an essential micronutrient for humans and animals, and its deficiency can predispose to the development of pathological conditions. This study evaluates the effect of selenium deficiency on the thioredoxin system, consisting of NADPH, selenoprotein thioredoxin reductase (TrxR), and thioredoxin (Trx); and the glutathione system, including NADPH, glutathione reductase, glutathione, and glutaredoxin coupled with selenoprotein glutathione peroxidase (GPx). We particularly investigate whether inactive truncated TrxR is present under selenium-starvation conditions due to reading of the UGA codon as stop. Feeding rats a selenium-deficient diet resulted in a large decrease in activity of TrxR and GPx in rat liver but not in the levels of Trx1 and Grx1. However, selenium deficiency induced mitochondrial Grx2 10-fold and markedly changed the expression of some flavoproteins that are involved in the cellular folate, glucose, and lipid metabolism. Liver TrxR mRNA was nearly unchanged, but no truncated enzyme was found. Instead, a low-activity form of TrxR with a cysteine substituted for the penultimate selenocysteine in the C-terminal active site was identified in selenium-deficient rat liver. These results show a novel mechanism for decoding the UGA stop codon, inserting cysteine to make a full-length enzyme that may be required for selenium assimilation.
Collapse
Affiliation(s)
- Jun Lu
- Department of Medical Biochemistry and Biophysics, Karolinska Institute, SE-171 77 Stockholm, Sweden
| | | | | | | | | | | |
Collapse
|
93
|
Vunta H, Belda BJ, Arner RJ, Channa Reddy C, Vanden Heuvel JP, Sandeep Prabhu K. Selenium attenuates pro-inflammatory gene expression in macrophages. Mol Nutr Food Res 2008; 52:1316-23. [DOI: 10.1002/mnfr.200700346] [Citation(s) in RCA: 115] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
94
|
Lee MJ, Park WH, Song YS, Lee YW, Song YO, Moon GS. Effect of bamboo culm extract on oxidative stress and genetic expression: bamboo culm extract ameliorates cell adhesion molecule expression and NFkappaB activity through the suppression of the oxidative stress. Clin Nutr 2008; 27:755-63. [PMID: 18635292 DOI: 10.1016/j.clnu.2008.06.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2007] [Revised: 05/27/2008] [Accepted: 06/03/2008] [Indexed: 10/21/2022]
Abstract
BACKGROUND & AIMS This study was designed to investigate whether bamboo culm extract (BCE) supplementation may ameliorate risk factors of cardiovascular diseases, such as hypercholesterolemia. METHODS Oxidative stress and inflammatory mediators in plasma, livers of C57BL/6 mice fed high-cholesterol diet and calf pulmonary artery endothelial (CPAE) cells. Briefly, C57BL/6 mice were fed the high-cholesterol diet which was supplemented with 1% (w/w), or 3% (w/w) of BCE for 16 weeks. The concentration of total cholesterol, LDL-cholesterol, HDL-cholesterol level and atherogenic index were measured. Plasma TEAC value, hepatic thiobarbituric acid reactive substances (TBARS), protein carbonyl values and hepatic antioxidant enzyme activities, such as Cu,Zn-superoxide dismutase (SOD), Mn-SOD, glutathione peroxidase (GSH-Px), GSH reductase and catalase were determined. In addition, hepatic nuclear factor kappa B activities were detected. In the calf pulmonary artery endothelial (CPAE) cells stimulated with lipopolysaccharide, the expression of vascular cell adhesion molecule-1 (VCAM-1) and intracellular cell adhesion molecule-1 (ICAM-1) were measured. RESULTS Plasma cholesterol level was decreased, while HDL-cholesterol was increased, thus atherogenic index was lowered in BCE-supplemented animals. Plasma trolox equivalent and hepatic thiobarbituric acid reactive substances and protein carbonyl values were lowered significantly in BCE groups (p<0.05) in a dose-dependent manner. Hepatic antioxidative enzyme activities, such as Cu,Zn-superoxide dismutase (SOD), Mn-SOD, glutathione peroxidase (GSH-P), GSH reductase, and catalase were elevated in mice fed BCE-supplemented diets (p<0.05). Nuclear factor kappa B activities of livers and vascular cell adhesion molecule-1 and intracellular cell adhesion molecule-1 expressions in CPAE cells stimulated with lipopolysaccharide were significantly lowered in BCE groups (p<0.05). CONCLUSION These results suggest that BCE supplementation may modulate lipoprotein composition and attenuate oxidative stress by elevated antioxidative processes, thus suppressing inflammatory mediator activation as possible mechanism of its anti-atherogenic effect.
Collapse
Affiliation(s)
- Min-Ja Lee
- Cardiovascular Medical Research Center, Department of Diagnostics, Dongguk University, Sukjang-Dong 707, Kyung-Ju 780-714, Republic of Korea.
| | | | | | | | | | | |
Collapse
|
95
|
Verma S, Molina Y, Lo YY, Cropp B, Nakano C, Yanagihara R, Nerurkar VR. In vitro effects of selenium deficiency on West Nile virus replication and cytopathogenicity. Virol J 2008; 5:66. [PMID: 18513435 PMCID: PMC2453119 DOI: 10.1186/1743-422x-5-66] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2008] [Accepted: 05/31/2008] [Indexed: 11/28/2022] Open
Abstract
Background Selenium (Se) deficiency plays an important role in viral pathogenesis. To understand the effects of Se deficiency on West Nile virus (WNV) infection, we analyzed cytopathogenicity, apoptosis and viral replication kinetics, using a newly developed Se-deficient cell culture system. Results Both Vero and SK-N-SH cells grown in Se-deficient media exhibited a gradual loss of glutathione peroxidase (GPx1) activity without any significant effect on cell growth and viability. In SK-N-SH cells, Se deficiency had no effect on the expression of key antioxidant enzymes, including manganese- and copper-zinc superoxide dismutase (MnSOD and CuZnSOD), catalase and inducible nitric oxide synthase, whereas Vero cells demonstrated a significant increase in the expression of MnSOD and an overall increase in oxidative stress (OS) at day 7 post-induction of Se deficiency. At 2 days after infection with WNV, CPE and cell death were significantly higher in WNV-infected Se-deficient Vero cells, compared to WNV-infected control cells. Furthermore, WNV-induced apoptosis was significantly heightened in Se-deficient cells and was contributed by loss of mitochondrial membrane potential and increased caspase activity. However, no significant difference was found in WNV copy numbers between control, Se-adequate and Se-deficient cell cultures. Conclusion Overall results demonstrate that the in vitro Se-deficient model can be used to study responses of WNV to this essential nutrient. Although Se deficiency has no in vitro effect on WNV replication kinetics, adequate Se is presumably critical to protect WNV-infected cells against virus-induced cell death.
Collapse
Affiliation(s)
- Saguna Verma
- Retrovirology Research Laboratory, Department of Tropical Medicine, Medical Microbiology and Pharmacology, John A, Burns School of Medicine, University of Hawaii at Manoa, Honolulu, HI 96813, USA.
| | | | | | | | | | | | | |
Collapse
|
96
|
Smith AD, Botero S, Levander OA. Copper deficiency increases the virulence of amyocarditic and myocarditic strains of coxsackievirus B3 in mice. J Nutr 2008; 138:849-55. [PMID: 18424590 DOI: 10.1093/jn/138.5.849] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Deficiency in several trace elements, including copper and selenium, is associated with increased levels of oxidative stress. Copper deficiency also has been shown to impair immune function. Previous work by others demonstrated that passage of an amyocarditic or myocarditic strain of coxsackievirus B3 (CVB3) through selenium- or vitamin E-deficient mice led to increased cardiac pathology. To determine whether a copper deficiency would similarly alter the pathogenesis of CVB3 infections, Swiss outbred dams and their litters were fed copper-deficient diets from birth and received either deionized water or water with 0.315 mmol/L copper as copper sulfate. At 4 wk of age, copper-adequate or -deficient male and female offspring were infected with an amyocarditic or myocarditic strain of CVB3. Heart titers were elevated at d 3 and 7 postinfection in copper-deficient mice infected with the myocarditic CVB3 strain (CVB3/20) but only at d 7 in deficient mice infected with the amyocarditic CVB3 strain (CVB3/0) compared with copper-adequate controls. Copper-deficient mice infected with either strain of CVB3 had increased cardiac pathology compared with copper-adequate controls. Genomic sequences of viruses isolated from copper-adequate and -deficient mice were identical. Heart cytokine expression was elevated in copper-deficient CVB3-infected mice compared with infected controls. Circulating CVB3-specific IgG2a but not IgM levels were decreased in copper-deficient mice. Thus, copper deficiency is associated with an increased inflammatory response but decreased acquired immune response to CVB3 infection that results in increased cardiac pathology, presumably due to increased viral load.
Collapse
Affiliation(s)
- Allen D Smith
- Diet, Genomics, and Immunology Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Service, USDA, Beltsville, MD 20705, USA.
| | | | | |
Collapse
|
97
|
Yun CH, Yang JS, Kang SS, Yang Y, Cho JH, Son CG, Han SH. NF-κB signaling pathway, not IFN-β/STAT1, is responsible for the selenium suppression of LPS-induced nitric oxide production. Int Immunopharmacol 2007; 7:1192-8. [PMID: 17630198 DOI: 10.1016/j.intimp.2007.05.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2007] [Revised: 05/01/2007] [Accepted: 05/01/2007] [Indexed: 01/22/2023]
Abstract
Upon stimulation of macrophages with lipopolysaccharide (LPS), Toll-like receptor 4 recognizes LPS, leading to expression of inducible nitric oxide synthase (iNOS), via MyD88/NF-kappaB and TRIF/IFN-beta/STAT pathways. Although selenium (Se) was reported to inhibit nitric oxide (NO) production, it is unclear which signaling pathway is inhibited by Se. Here, we investigated how Se inhibits NO production in LPS-stimulated RAW 264.7 cells. When the cells were pretreated with Se for 1 h followed by LPS treatment, iNOS mRNA expression and subsequent NO production declined significantly in a dose-dependent manner. Se inhibited IkappaBalpha degradation in the cytosol and NF-kappaB binding to its recognition site in the nucleus of the LPS-stimulated cells. Meanwhile, Se did not inhibit IFN-beta mRNA induction or STAT1 phosphorylation in the LPS-stimulated cells. These results suggest that Se down-regulates iNOS gene expression and NO production in the LPS-stimulated macrophages through inhibition of the NF-kappaB activation pathway but not the IFN-beta/STAT1 signaling pathway.
Collapse
Affiliation(s)
- Cheol-Heui Yun
- School of Agricultural Biotechnology, Seoul National University, Seoul 151-742, Republic of Korea
| | | | | | | | | | | | | |
Collapse
|
98
|
Jung KH, Ha E, Kim MJ, Won HJ, Zheng LT, Kim HK, Hong SJ, Chung JH, Yim SV. Suppressive effects of nitric oxide (NO) production and inducible nitric oxide synthase (iNOS) expression by Citrus reticulata extract in RAW 264.7 macrophage cells. Food Chem Toxicol 2007; 45:1545-50. [PMID: 17418925 DOI: 10.1016/j.fct.2007.02.017] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2006] [Revised: 12/23/2006] [Accepted: 02/14/2007] [Indexed: 11/30/2022]
Abstract
Immature peels of Citrus reticulata extract (CR) are widely used as traditional herbal medicine in Korea. We studied its effects on nitric oxide (NO) production and inducible nitric oxide synthase (iNOS) expression in RAW 264.7 macrophage cells. NO production was assessed by nitrite assay and iNOS expression was identified by reverse transcription-polymerase chain reaction (RT-PCR), Real-time PCR and Western blot. The promoter activity of iNOS gene was also determined by luciferase reporter gene assay using 5'-flanking region of murine iNOS gene. Activation of nuclear factor kappa B (NF-kappaB) was determined by electrophoretic mobility shift assay (EMSA). CR (20, 50, and 100 microg/ml) significantly inhibited the lipopolysaccharide (LPS)-induced NO production (P<0.01; 9.2+/-1.5, 4.8+/-0.6, and 3.3+/-0.4 microM), iNOS protein (38.1+/-3.8, 32.3+/-5.8, and 36.8+/-4.5%) and mRNA expression (34.2+/-4.1, 13.1+/-5.8, and 20.8+/-1.2%) in RAW 264.7 macrophage cells. CR (20, 50, and 100 microg/ml) also reduced the iNOS promoter activity (68.7+/-3.9, 50.6+/-5.6, and 45.9+/-3.9%) in piNOS-LUC-transfected cells. In addition, CR (20, 50, and 100 microg/ml) significantly inhibited the activity of NF-kappaB DNA binding activity in LPS-induced macrophage cells (P<0.05; 51.8+/-4.1, 32.7+/-5.5, and 35.7+/-2.9%). These results suggest that CR may suppress LPS-stimulated NO production by inhibiting of NF-kappaB.
Collapse
Affiliation(s)
- Kyung Hee Jung
- Department of Pharmacology, School of Medicine, Kyung Hee University, Hoegi-dong, Dongdaemun-gu, Seoul 130-701, Republic of Korea
| | | | | | | | | | | | | | | | | |
Collapse
|
99
|
Christensen MJ, Nartey ET, Hada AL, Legg RL, Barzee BR. High Selenium Reduces NF-κB-Regulated Gene Expression in Uninduced Human Prostate Cancer Cells. Nutr Cancer 2007; 58:197-204. [PMID: 17640166 DOI: 10.1080/01635580701328701] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Nuclear factor kappa B (NF-kappaB) induces expression of antiapoptotic and pro-inflammatory genes and is constitutively activated in prostate cancer. We tested the hypothesis that a biologically and physiologically relevant form and concentration of selenium (Se) may alter NF-kappa B activation in early prostate cancer cells in the absence of exogenously added inducers of the NF-kappaB pathway. LNCaP cells were cultured in medium without added tumor necrosis factor alpha or lipopolysaccharide but with methylseleninic acid added to provide final concentrations of Se of 30 nM-7.6 microM. Compared to 50 nM Se, treatment with 7.6 microM Se virtually eliminated NF-kappaB binding to its DNA response element and reduced transcription rates and mRNA levels by half for NF-kappaB-regulated genes. There were no differences due to Se in tyrosine phosphorylation, inhibitor of kappa B alpha (I kappa B alpha) levels, or NF-kappaB translocation from cytosol to nucleus. The observation in these basal, unstimulated cells of altered NF-kappaB binding to DNA in the absence of effects on the NF-kappaB activation pathway suggests an interaction of Se with the NF-kappaB protein or an effect on recruitment of NF-kappaB coactivators or corepressors. Inhibition of transcription factor binding and anti-apoptotic gene expression may be one mechanism for the chemopreventive effects of Se against prostate cancer.
Collapse
Affiliation(s)
- Merrill J Christensen
- Department of Nutrition, Dietetics, and Food Science, Brigham Young University, Provo, UT 84602, USA.
| | | | | | | | | |
Collapse
|
100
|
Vunta H, Davis F, Palempalli UD, Bhat D, Arner RJ, Thompson JT, Peterson DG, Reddy CC, Prabhu KS. The anti-inflammatory effects of selenium are mediated through 15-deoxy-Delta12,14-prostaglandin J2 in macrophages. J Biol Chem 2007; 282:17964-17973. [PMID: 17439952 DOI: 10.1074/jbc.m703075200] [Citation(s) in RCA: 152] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Selenium is an essential micronutrient that suppresses the redox-sensitive transcription factor NF-kappaB-dependent pro-inflammatory gene expression. To understand the molecular mechanisms underlying the anti-inflammatory property of selenium, we examined the activity of a key kinase of the NF-kappaB cascade, IkappaB-kinase beta (IKKbeta) subunit, as a function of cellular selenium status in murine primary bone marrow-derived macrophages and RAW264.7 macrophage-like cell line. In vitro kinase assays revealed that selenium supplementation decreased the activity of IKKbeta in lipopolysaccharide (LPS)-treated macrophages. Stimulation by LPS of selenium-supplemented macrophages resulted in a time-dependent increase in 15-deoxy-Delta12,14-prostaglandin J2 (15d-PGJ2) formation, an endogenous inhibitor of IKKbeta activity. Further analysis revealed that inhibition of IKKbeta activity in selenium-supplemented cells correlated with the Michael addition product of 15d-PGJ2 with Cys-179 of IKKbeta, while the formation of such an adduct was significantly decreased in the selenium-deficient macrophages. In addition, anti-inflammatory activities of selenium were also mediated by the 15d-PGJ2-dependent activation of the peroxisome proliferator-activated nuclear receptor-gamma in macrophages. Experiments using specific cyclooxygenase (COX) inhibitors and genetic knockdown approaches indicated that COX-1, and not the COX-2 pathway, was responsible for the increased synthesis of 15d-PGJ2 in selenium-supplemented macrophages. Taken together, our results suggest that selenium supplementation increases the production of 15d-PGJ2 as an adaptive response to protect cells against oxidative stress-induced pro-inflammatory gene expression. More specifically, modification of protein thiols by 15d-PGJ2 represents a previously undescribed code for redox regulation of gene expression by selenium.
Collapse
Affiliation(s)
- Hema Vunta
- Department of Veterinary and Biomedical Sciences, Centers for Molecular Toxicology and Carcinogenesis, and Molecular Immunology and Infectious Disease, Pennsylvania State University, University Park, Pennsylvania 16802
| | - Faith Davis
- Department of Veterinary and Biomedical Sciences, Centers for Molecular Toxicology and Carcinogenesis, and Molecular Immunology and Infectious Disease, Pennsylvania State University, University Park, Pennsylvania 16802
| | - Umamaheswari D Palempalli
- Department of Veterinary and Biomedical Sciences, Centers for Molecular Toxicology and Carcinogenesis, and Molecular Immunology and Infectious Disease, Pennsylvania State University, University Park, Pennsylvania 16802
| | - Deepa Bhat
- Department of Veterinary and Biomedical Sciences, Centers for Molecular Toxicology and Carcinogenesis, and Molecular Immunology and Infectious Disease, Pennsylvania State University, University Park, Pennsylvania 16802
| | - Ryan J Arner
- Department of Veterinary and Biomedical Sciences, Centers for Molecular Toxicology and Carcinogenesis, and Molecular Immunology and Infectious Disease, Pennsylvania State University, University Park, Pennsylvania 16802
| | - Jerry T Thompson
- Department of Veterinary and Biomedical Sciences, Centers for Molecular Toxicology and Carcinogenesis, and Molecular Immunology and Infectious Disease, Pennsylvania State University, University Park, Pennsylvania 16802
| | - Devin G Peterson
- Department of Food Science, Pennsylvania State University, University Park, Pennsylvania 16802
| | - C Channa Reddy
- Department of Veterinary and Biomedical Sciences, Centers for Molecular Toxicology and Carcinogenesis, and Molecular Immunology and Infectious Disease, Pennsylvania State University, University Park, Pennsylvania 16802.
| | - K Sandeep Prabhu
- Department of Veterinary and Biomedical Sciences, Centers for Molecular Toxicology and Carcinogenesis, and Molecular Immunology and Infectious Disease, Pennsylvania State University, University Park, Pennsylvania 16802.
| |
Collapse
|