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Zhang D, Li Y, Pan J, Zheng Y, Xu X. Copper homeostasis and cuproptosis in radiation-induced injury. Biomed Pharmacother 2024; 178:117150. [PMID: 39047417 DOI: 10.1016/j.biopha.2024.117150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2024] [Revised: 07/10/2024] [Accepted: 07/12/2024] [Indexed: 07/27/2024] Open
Abstract
Radiation therapy for cancer treatment brings about a series of radiation injuries to normal tissues. In recent years, the discovery of copper-regulated cell death, cuproptosis, a novel form of programmed cell death, has attracted widespread attention and exploration in various biological functions and pathological mechanisms of copper metabolism and cuproptosis. Understanding its role in the process of radiation injury may open up new avenues and directions for exploration in radiation biology and radiation oncology, thereby improving tumor response and mitigating adverse reactions to radiotherapy. This review provides an overview of copper metabolism, the characteristics of cuproptosis, and their potential regulatory mechanisms in radiation injury.
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Affiliation(s)
- Daoming Zhang
- Department of Oncology, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Yuan Li
- Department of Oncology, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Jinghui Pan
- Department of Oncology, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Yongfa Zheng
- Department of Oncology, Renmin Hospital of Wuhan University, Wuhan 430060, China.
| | - Ximing Xu
- Department of Oncology, Renmin Hospital of Wuhan University, Wuhan 430060, China.
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Zhang Y, Chen Z, Chen JG, Chen XF, Gu DH, Liu ZM, Gao YD, Zheng B. Ceruloplasmin overexpression is associated with oncogenic pathways and poorer survival rates in clear-cell renal cell carcinoma. FEBS Open Bio 2021; 11:2988-3004. [PMID: 34449964 PMCID: PMC8564342 DOI: 10.1002/2211-5463.13283] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 07/28/2021] [Accepted: 08/26/2021] [Indexed: 01/25/2023] Open
Abstract
Clear-cell renal cell carcinoma (ccRCC) is the most prevalent renal malignancy. The pathogenesis of the disease is currently poorly understood, and the prognosis is poor. Therefore, in this study, we focused on exploring and identifying genes and signal transduction pathways that are closely related to ccRCC. Differentially expressed genes (DEGs) were analyzed using the renal cell oncogene expression profiles GSE100666 and GSE68417. DAVID evaluation of gene ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) analyses was used. We constructed a protein-protein interaction (PPI) network of DEGS using Cytoscape software and analyzed the submodules with the CytoHubba plugin. Finally, we performed western blot, immunohistochemistry, and PCR validation by collecting tissues, and also utilized cells for in vitro functional analysis of ceruloplasmin (CP). In total, 202 DEGs (52 upregulated and 150 downregulated genes) were identified. Upregulated DEGs are significantly rich in angiogenesis, cell adhesion, and response to hypoxia, whereas downregulated DEGs are involved in intracellular pH regulation, excretion, coagulation, and chloride transmembrane transport. We selected the interactions of the top 20 hub genes provided by the PPI network, all of which are involved in important physiological pathways in vivo, such as complement and coagulation cascades. Tissue protein assays demonstrated that renal cancer highly expressed CP, while in vitro experiments showed that CP could promote the invasion of renal cancer cells. Our study suggests that ALB, C3, LOX, HRG, CXCR4, GPC3, SLC12A3, CP, and CASR may be involved in the development of ccRCC, and is expected to provide theoretical support for future studies on the diagnosis and targeted therapy of ccRCC.
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Affiliation(s)
- Yong Zhang
- Department of Urology, The Second Affiliated Hospital of Nantong University, China.,Department of Medical Research Center, The Second Affiliated Hospital of Nantong University, China
| | - Zhan Chen
- Department of Urology, The Second Affiliated Hospital of Nantong University, China.,Department of Medical Research Center, The Second Affiliated Hospital of Nantong University, China
| | - Jian-Gang Chen
- Department of Urology, The Second Affiliated Hospital of Nantong University, China
| | - Xin-Feng Chen
- Department of Urology, The Second Affiliated Hospital of Nantong University, China
| | - Dong-Hua Gu
- Department of Urology, The Second Affiliated Hospital of Nantong University, China
| | - Zhen-Min Liu
- Department of Urology, The Second Affiliated Hospital of Nantong University, China
| | - Ya-Dong Gao
- Department of Medical Research Center, The Second Affiliated Hospital of Nantong University, China.,Department of Gastroenterology, The Second Affiliated Hospital of Nantong University, China
| | - Bing Zheng
- Department of Urology, The Second Affiliated Hospital of Nantong University, China
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Matsuoka R, Shiba-Ishii A, Nakano N, Togayachi A, Sakashita S, Sato Y, Minami Y, Noguchi M. Heterotopic production of ceruloplasmin by lung adenocarcinoma is significantly correlated with prognosis. Lung Cancer 2018; 118:97-104. [DOI: 10.1016/j.lungcan.2018.01.012] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Revised: 12/22/2017] [Accepted: 01/17/2018] [Indexed: 12/21/2022]
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Gao C, Zhu L, Zhu F, Sun J, Zhu Z. Effects of different sources of copper on Ctr1, ATP7A, ATP7B, MT and DMT1 protein and gene expression in Caco-2 cells. J Trace Elem Med Biol 2014; 28:344-50. [PMID: 24815816 DOI: 10.1016/j.jtemb.2014.04.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2014] [Revised: 03/17/2014] [Accepted: 04/14/2014] [Indexed: 01/04/2023]
Abstract
Copper sulfate (CuSO4), micron copper oxide (micron CuO) and nano copper oxide (nano CuO) at different concentrations were, respectively, added to culture media containing Caco-2 cells and their effects on Ctr1, ATP7A/7B, MT and DMT1 gene expression and protein expression were investigated and compared. The results showed that nano CuO promoted mRNA expression of Ctr1 in Caco-2 cells, and the difference was significant compared with micron CuO and CuSO4. Nano CuO was more effective in promoting the expression of Ctr1 protein than CuSO4 and micron CuO at the same concentration. Nano CuO at a concentration of 62.5 μM increased the mRNA expression levels of ATP7A and ATP7B, and the difference was significant compared with CuSO4. The addition of CuSO4 and nano CuO to the culture media promoted the expression of ATP7B proteins. CuSO4 at a concentration of 125 μM increased the mRNA expression level of MT in Caco-2 cells, and the difference was significant compared with nano CuO and micron CuO. Nano CuO at a concentration of 62.5 μM inhibited the mRNA expression of DMT1, and the difference was significant compared with CuSO4 and micron CuO. Thus, the effects of CuSO4, micron CuO and nano CuO on the expression of copper transport proteins and the genes encoding these proteins differed considerably. Nano CuO has a different uptake and transport mechanism in Caco-2 cells to those of CuSO4 and micron CuO.
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Affiliation(s)
- Chen Gao
- College of Veterinary Medicine, Jilin University, Changchun 130062, China; College of Animal Science and Veterinary Medicine, Qingdao Agricultural University, Qingdao 266109, China; College of Agriculture, Dezhou University, Dezhou 253023, China
| | - Lianqin Zhu
- College of Veterinary Medicine, Jilin University, Changchun 130062, China; College of Animal Science and Veterinary Medicine, Qingdao Agricultural University, Qingdao 266109, China.
| | - Fenghua Zhu
- College of Animal Science and Veterinary Medicine, Qingdao Agricultural University, Qingdao 266109, China
| | - Jinquan Sun
- College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
| | - Zuxian Zhu
- College of Animal Science and Veterinary Medicine, Qingdao Agricultural University, Qingdao 266109, China
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Tsymbalenko NV, Gyulikhandanova NE, Platonova NA, Babich VS, Evsyukova II, Puchkova LV. Regulation of ceruloplasmin gene activity in mammary gland cells. RUSS J GENET+ 2009. [DOI: 10.1134/s1022795409030132] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Starr JM, Shiels PG, Harris SE, Pattie A, Pearce MS, Relton CL, Deary IJ. Oxidative stress, telomere length and biomarkers of physical aging in a cohort aged 79 years from the 1932 Scottish Mental Survey. Mech Ageing Dev 2008; 129:745-51. [PMID: 18977241 DOI: 10.1016/j.mad.2008.09.020] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2008] [Revised: 08/05/2008] [Accepted: 09/26/2008] [Indexed: 01/08/2023]
Abstract
Telomere shortening is a biomarker of cellular senescence and is associated with a wide range of age-related disease. Oxidative stress is also associated with physiological aging and several age-related diseases. Non-human studies suggest that variants in oxidative stress genes may contribute to both telomere shortening and biological aging. We sought to test whether oxidative stress-related gene polymorphisms contribute to variance in both telomere length and physical biomarkers of aging in humans. Telomere lengths were calculated for 190 (82 men, 108 women) participants aged 79 years and associations with 384 SNPs, from 141 oxidative stress genes, identified 9 significant SNPS, of which those from 5 genes (GSTZ1, MSRA, NDUFA3, NDUFA8, VIM) had robust associations with physical aging biomarkers, respiratory function or grip strength. Replication of associations in a sample of 318 (120 males, 198 females) participants aged 50 years confirmed significant associations for two of the five SNPs (MSRA rs4841322, p=0.008; NDUFA8 rs6822, p=0.048) on telomere length. These data indicate that oxidative stress genes may be involved in pathways that lead to both telomere shortening and physiological aging in humans. Oxidative stress may explain, at least in part, associations between telomere shortening and physiological aging.
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Affiliation(s)
- John M Starr
- MRC Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Royal Victoria Hospital, Edinburgh EH4 2DN, UK.
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Sonne C, Fonfara S, Dietz R, Kirkegaard M, Letcher RJ, Shahmiri S, Andersen S, Møller P. Multiple cytokine and acute-phase protein gene transcription in West Greenland sledge dogs (Canis familiaris) dietary exposed to organic environmental pollutants. ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2007; 53:110-8. [PMID: 17396211 DOI: 10.1007/s00244-006-0135-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2006] [Accepted: 11/05/2006] [Indexed: 05/14/2023]
Abstract
Exposure levels of persistent organic pollutants, such as polychlorinated biphenyls and DDTs, are high in Arctic apex predators and Inuit peoples and are suspected to have negative impacts on their immune systems. We conducted a controlled generational study on liver tissue and ethylenediaminetetraacetic acid blood cytokine and acute-phase protein (APP) mRNA expressions using reverse transcriptionase-polymerase chain reaction in West Greenland sledge dogs (Canis familiaris); contaminated minke whale (Balaenoptera acutorostrata) blubber serves as dietary pollutant source. Two of seven blood cytokine expressions (IL-6 and IL-12) and three of five APP expressions (haptoglobin [HP], heat shock protein, and fatty acid-binding protein [FABP]) were lowest in the exposed group, whereas the remaining five blood cytokine expressions (IL-2, IL-10, IFN-gamma, TNF-alpha, and TGF-beta) and two APP expressions (MT1 and MT2) were highest in the exposed group. In liver tissue, three cytokine expressions (IL-10, IFN-gamma, and TNF-alpha) and two APP expressions (MT1 and MT2) were highest in the exposed group, and the remaining cytokine and APP expressions were lowest in the exposed group. Of these, the liver tissue expression of HP and FABP was significantly lowest in the exposed group (both p < 0.05). As a consequence of our findings, we suggest that a daily intake of 50 to 200 g polluted whale blubber is associated with a genotoxic decrease in HP and FABP gene expression in the liver of sledge dog and possibly of other top mammalian marine predators and consumers in the Arctic, indicating a restricted acute-phase reaction and insufficient immune response. Finally, HP and FABP liver expression appear to be new and sensitive biomarkers of organohalogen compound exposure.
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Affiliation(s)
- C Sonne
- Department of Arctic Environment Section for Contaminants and Marine Mammals, National Environmental Research Institute, University of Aarhus, Frederiksborgvej 399, P. O. Box 358, DK-4000, Roskilde, Denmark.
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Spee B, Mandigers PJJ, Arends B, Bode P, van den Ingh TSGAM, Hoffmann G, Rothuizen J, Penning LC. Differential expression of copper-associated and oxidative stress related proteins in a new variant of copper toxicosis in Doberman pinschers. COMPARATIVE HEPATOLOGY 2005; 4:3. [PMID: 15790412 PMCID: PMC1079907 DOI: 10.1186/1476-5926-4-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2005] [Accepted: 03/24/2005] [Indexed: 03/17/2023]
Abstract
BACKGROUND: The role of copper accumulation in the onset of hepatitis is still unclear. Therefore, we investigated a spontaneous disease model of primary copper-toxicosis in Doberman pinschers so to gain insights into the pathophysiology of copper toxicosis, namely on genes involved in copper metabolism and reactive oxygen species (ROS) defences. RESULTS: We used quantitative real-time PCR to determine differentially expressed genes within a target panel, investigating different groups ranging from copper-associated subclinical hepatitis (CASH) to a clinical chronic hepatitis with high hepatic copper concentrations (Doberman hepatitis, DH). Furthermore, a non-copper associated subclinical hepatitis group (N-CASH) with normal hepatic copper concentrations was added as a control. Most mRNA levels of proteins involved in copper binding, transport, and excretion were around control values in the N-CASH and CASH group. In contrast, many of these (including ATP7A, ATP7B, ceruloplasmin, and metallothionein) were significantly reduced in the DH group. Measurements on defences against oxidative stress showed a decrease in gene-expression of superoxide dismutase 1 and catalase in both groups with high copper. Moreover, the anti-oxidative glutathione molecule was clearly reduced in the DH group. CONCLUSION: In the DH group the expression of gene products involved in copper efflux was significantly reduced, which might explain the high hepatic copper levels in this disease. ROS defences were most likely impaired in the CASH and DH group. Overall, this study describes a new variant of primary copper toxicosis and could provide a molecular basis for equating future treatments in dog and in man.
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Affiliation(s)
- Bart Spee
- Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine, Utrecht University, The Netherlands
| | - Paul JJ Mandigers
- Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine, Utrecht University, The Netherlands
| | - Brigitte Arends
- Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine, Utrecht University, The Netherlands
| | - Peter Bode
- Interfacultary Reactor Institute, Delft University, The Netherlands
| | - Ted SGAM van den Ingh
- Department of Pathobiology, Faculty of Veterinary Medicine, Utrecht University, The Netherlands
| | - Gaby Hoffmann
- Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine, Utrecht University, The Netherlands
| | - Jan Rothuizen
- Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine, Utrecht University, The Netherlands
| | - Louis C Penning
- Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine, Utrecht University, The Netherlands
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9
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Jura J, Wegrzyn P, Zarebski A, Władyka B, Koj A. Identification of changes in the transcriptome profile of human hepatoma HepG2 cells stimulated with interleukin-1 beta. Biochim Biophys Acta Mol Basis Dis 2004; 1689:120-33. [PMID: 15196593 DOI: 10.1016/j.bbadis.2004.03.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2003] [Revised: 02/27/2004] [Accepted: 03/02/2004] [Indexed: 10/26/2022]
Abstract
Interleukin-1 (IL-1) is the principal pro-inflammatory cytokine participating in the initiation of acute phase response. Human hepatoma HepG2 cells were exposed to 15 ng/ml of IL-1beta for times ranging from 1 to 24 h and the total RNA was isolated. Then cDNA was obtained and used for differential display with 10 arbitrary primers and 9 oligo(dT) primers designed by Clontech. Validation of observed changes of differentially expressed known genes was carried out by RT-PCR or Northern blot analysis. Out of 90 cDNA strands modulated by IL-1, 46 have been successfully reamplified and their sequencing indicates that they represent 36 different cDNA templates. By GenBank search, 26 cDNA clones were identified as already known genes while 10 showed no homology to any known gene. The identified transcripts modulated by IL-1 in HepG2 cells code for intracellular proteins of various function: trafficking/motor proteins (3 genes), proteins participating in the translation machinery or posttranscriptional/posttranslational modifications (7 genes), proteases (1 gene), proteins involved in metabolism (6 genes), activity modulators (3 genes), proteins of the cell cycle machinery (2 genes) and those functionally unclassified (4 genes). Majority of genes responded to IL-1 within 1 to 6 h (early genes), while two were late response genes (12-24 h) and four showed prolonged response over the whole 24-h period. Most of the observed changes of expression were in the range of two- to threefold increase in comparison to control untreated cells. Among identified genes, no typical secretory acute phase protein was found. The obtained results suggest that IL-1 affects the expression of several genes in HepG2 cells, especially those engaged in the synthesis and modifications of proteins.
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Affiliation(s)
- Jolanta Jura
- Department of Cell Biochemistry, Faculty of Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387 Cracow, Poland
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Carrera G, Paternain JL, Carrere N, Folch J, Courtade-Saïdi M, Orfila C, Vinel JP, Alric L, Pipy B. Hepatic metallothionein in patients with chronic hepatitis C: relationship with severity of liver disease and response to treatment. Am J Gastroenterol 2003; 98:1142-9. [PMID: 12809840 DOI: 10.1111/j.1572-0241.2003.07403.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVES Reactive oxygen species may be involved in the pathogenesis of chronic hepatitis C virus infection. Metallothionein (MT) is an essential protein for the protection of cells against reactive oxygen species. The aim of this prospective study was to assess the influence of the hepatic level and cellular distribution of MT in hepatitis C virus (HCV) infection and in the liver disease outcome. METHODS In liver biopsy samples of 32 patients with chronic HCV infection and of 12 control subjects, quantification of MT was performed by radioimmunoassay, MT, interleukin (IL)-1 and -6, and tumor necrosis factor (INF)-alpha mRNA by reverse transcription-polymerase chain reaction (PCR) and cellular distribution by immunohistochemistry. RESULTS In HCV-infected patients, MT liver protein level was 3-fold lower than in control specimens. A significant inverse linear regression between MT protein or mRNA expression and the Histological Activity Index, the necroinflammatory grade, and the stage of fibrosis was observed. MT immunostaining was located in the nucleus and cytoplasm in hepatocytes of control subjects, whereas it was mainly cytoplasmic in HCV-infected patients. Before interferon (IFN) therapy, the hepatic MT level in patients that were nonsustained responders was half that of sustained responders. Intrahepatic IL-6 and MT were simultaneously down-regulated, but no correlation was found between MT and intrahepatic cytokine mRNA expression in patients with chronic HCV infection. CONCLUSIONS This study shows that hepatic MT expression could reflect the severity of chronic HCV infection and could be one of the factors associated with a favorable clinical outcome in the response to interferon therapy.
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Affiliation(s)
- Georges Carrera
- Laboratory of Macrophage, Inflammatory Mediators and Cellular Interactions, Institut Louis Bugnard, Centre Hospitalier Universitaire Rangueil, Toulouse Cedex, France
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Katsuma S, Shiojima S, Hirasawa A, Takagaki K, Kaminishi Y, Koba M, Hagidai Y, Murai M, Ohgi T, Yano J, Tsujimoto G. Global analysis of differentially expressed genes during progression of calcium oxalate nephrolithiasis. Biochem Biophys Res Commun 2002; 296:544-52. [PMID: 12176015 DOI: 10.1016/s0006-291x(02)00840-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The process of nephrolithiasis development is poorly understood at the molecular level. Here, we constructed a cDNA microarray from a rat kidney normalized cDNA library, and investigated the pattern of gene expression in rat kidneys from a calcium oxalate (CaOx) nephrolithiasis model. One hundred and seventy-three genes were found to be at least 2-fold regulated at one or more time points during progression of nephrolithiasis. RT-PCR and immunohistochemical analyses confirmed differential expression at both transcriptional and translational levels of genes identified by cDNA microarray screening. The differentially regulated genes were grouped into six clusters based on their expression profiles; the magnitude and the temporal patterns of gene expression identified known and novel molecular components involved in inflammation and matrix expansion in the CaOx nephrolithiasis kidney. This microarray study is the first report on gene expression programs underlying the process of nephrolithiasis.
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Affiliation(s)
- Susumu Katsuma
- Department of Molecular, Cell Pharmacology, National Center for Child Health and Development Research Institute, 3-35-31 Taishido, Setagaya-Ku, Tokyo 154-8567, Japan
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Seshadri V, Fox PL, Mukhopadhyay CK. Dual role of insulin in transcriptional regulation of the acute phase reactant ceruloplasmin. J Biol Chem 2002; 277:27903-11. [PMID: 12029093 DOI: 10.1074/jbc.m203610200] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Insulin is a potent negative regulator of the response of hepatic cells to pro-inflammatory cytokines, particularly, interleukin (IL)-6. The action of insulin is target-selective because it inhibits transcription of most but not all acute phase genes. We here show that ceruloplasmin (Cp), an acute phase reactant with important functions in iron homeostasis, is subject to a unique dual regulation by insulin. IL-6 increased Cp mRNA expression in HepG2 cells by approximately 5-fold. Simultaneous treatment with insulin reduced this stimulation by half. Surprisingly, insulin by itself caused a 2-4-fold induction in Cp mRNA expression. The mechanism of induction by insulin was studied by transfecting into HepG2 cells chimeric constructs of the Cp 5'-flanking region driving luciferase. The activity of a 4800-bp segment of the Cp 5'-flanking region was increased 3-fold by insulin. Deletion and mutation analyses showed the requirement for a single hypoxia-responsive element in a 96-bp segment approximately 3600 bp upstream of the initiation site. The domains required for the two activities of insulin were distinct: The distal, hypoxia-responsive element-containing site was sufficient for Cp transactivation by insulin; in contrast, an 848-bp region adjacent to the initiation site was sufficient for IL-6 transactivation of Cp and for the inhibitory activity of insulin. The role of hypoxia-inducible factor-1 in the induction of Cp by insulin was shown by electrophoretic mobility shift assays and by the absence of insulin-stimulated Cp promoter activation in mouse Hepa c4 cells deficient in hypoxia-inducible factor-1 activity. Taken together these results show that insulin functions as a bidirectional, condition-dependent regulator of hepatic cell Cp expression. The unique regulation of Cp may reflect its dual roles in inflammation and iron homeostasis.
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Affiliation(s)
- Vasudevan Seshadri
- Department of Cell Biology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA
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Danzeisen R, Fosset C, Chariana Z, Page K, David S, McArdle HJ. Placental ceruloplasmin homolog is regulated by iron and copper and is implicated in iron metabolism. Am J Physiol Cell Physiol 2002; 282:C472-8. [PMID: 11832331 DOI: 10.1152/ajpcell.00019.2001] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We previously reported an endogenous, membrane-bound Cu oxidase with homology to ceruloplasmin in BeWo cells, a placental choriocarcinoma cell line. In this previous study, ceruloplasmin immunoreactivity was localized to the perinuclear region and non-brush-border membranes. Here, we show that azide-sensitive oxidase activity is enriched in the same fractions, correlating subcellular localization of enzyme activity with ceruloplasmin immunoreactivity. Expression of the placental Cu oxidase is inversely proportional to Fe status and directly proportional to Cu status at enzyme and protein levels. To identify a role for the Cu oxidase, cells were exposed to (59)Fe-transferrin for 18 h in an environment of 20% O(2) or 5% O(2). At 5% O(2), Cu-deficient cells retain significantly more (59)Fe than control cells. This excess in (59)Fe accumulation is caused by a significant decrease in (59)Fe release. These results indicate that downregulation of the placental Cu oxidase in BeWo cells impairs Fe release. This effect is only apparent in an environment of limited O(2).
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Affiliation(s)
- Ruth Danzeisen
- The Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, United Kingdom
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