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Jeon T, Ko MJ, Seo YR, Jung SJ, Seo D, Park SY, Park KU, Kim KS, Kim M, Seo JH, Park IC, Kim MJ, Bae JH, Song DK, Cho CH, Lee JH, Lee YH. Silencing CDCA8 Suppresses Hepatocellular Carcinoma Growth and Stemness via Restoration of ATF3 Tumor Suppressor and Inactivation of AKT/β-Catenin Signaling. Cancers (Basel) 2021; 13:cancers13051055. [PMID: 33801424 PMCID: PMC7958635 DOI: 10.3390/cancers13051055] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 02/22/2021] [Accepted: 02/24/2021] [Indexed: 01/04/2023] Open
Abstract
Simple Summary Although the overexpression of CDCA8 is frequently observed in hepatocellular carcinoma (HCC) tissues, the functions of CDCA8 during HCC development remain to be clarified. The aim of our study was to investigate if targeting CDCA8 could affect liver tumor phenotypes in vitro and in vivo and to identify underlying molecular mechanisms to exert its therapeutic effect. We found that silencing of CDCA8 by siRNA inhibits the growth of parental cancer cell culture and mice tumors and suppresses stemness of CD133+ cancer stem cell population through the common responses of the upregulation of the tumor suppressive ATF3/GADD34 functional pathway and inactivation of the Akt/β–catenin signaling axis. These findings suggest CDCA8 as a novel therapeutic target for both primary HCC treatment and the prevention of metastasis or recurrence providing mode of action performed by a CDCA8 inhibitor. Abstract Big data analysis has revealed the upregulation of cell division cycle associated 8 (CDCA8) in human hepatocellular carcinoma (HCC) and its poorer survival outcome. However, the functions of CDCA8 during HCC development remain unknown. Here, we demonstrate in vitro that CDCA8 silencing inhibits HCC cell growth and long-term colony formation and migration through the accumulation of the G2/M phase cell population. Conversely, CDCA8 overexpression increases the ability to undergo long-term colony formation and migration. RNA sequencing and bioinformatic analysis revealed that CDCA8 knockdown led to the same directional regulation in 50 genes (25 down- and 25 upregulated). It was affirmed based on protein levels that CDCA8 silencing downregulates the levels of cyclin B1 and p-cdc2 and explains how it could induce G2/M arrest. The same condition increased the protein levels of tumor-suppressive ATF3 and GADD34 and inactivated AKT/β–catenin signaling, which plays an important role in cell growth and stemness, reflecting a reduction in sphere-forming capacity. Importantly, it was demonstrated that the extent of CDCA8 expression is much greater in CD133+ cancer stem cells than in CD133− cancer cells, and that CDCA8 knockdown decreases levels of CD133, p-Akt and β-catenin and increases levels of ATF3 and GADD34 in the CD133+ cancer stem cell (CSC) population. These molecular changes led to the inhibition of cell growth and sphere formation in the CD133+ cell population. Targeting CDCA8 also effectively suppressed tumor growth in a murine xenograft model, showing consistent molecular alterations in tumors injected with CDCA8siRNA. Taken together, these findings indicate that silencing CDCA8 suppresses HCC growth and stemness via restoring the ATF3 tumor suppressor and inactivating oncogenic AKT/β–catenin signaling, and that targeting CDCA8 may be the next molecular strategy for both primary HCC treatment and the prevention of metastasis or recurrence.
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Affiliation(s)
- Taewon Jeon
- Department of Molecular Medicine, Keimyung University School of Medicine, Daegu 42601, Korea; (T.J.); (M.J.K.); (Y.-R.S.); (S.-Y.P.); (M.-J.K.)
- Molecular and Cellular Biology Graduate Program, University of Massachusetts, Amherst, MA 01003, USA
| | - Min Ji Ko
- Department of Molecular Medicine, Keimyung University School of Medicine, Daegu 42601, Korea; (T.J.); (M.J.K.); (Y.-R.S.); (S.-Y.P.); (M.-J.K.)
| | - Yu-Ri Seo
- Department of Molecular Medicine, Keimyung University School of Medicine, Daegu 42601, Korea; (T.J.); (M.J.K.); (Y.-R.S.); (S.-Y.P.); (M.-J.K.)
| | - Soo-Jung Jung
- Department of Anatomy, Keimyung University School of Medicine, Daegu 42601, Korea;
| | - Daekwan Seo
- Department of Bioinformatics, Psomagen Inc., Rockville, MD 20850, USA;
| | - So-Young Park
- Department of Molecular Medicine, Keimyung University School of Medicine, Daegu 42601, Korea; (T.J.); (M.J.K.); (Y.-R.S.); (S.-Y.P.); (M.-J.K.)
| | - Keon Uk Park
- Department of Internal Medicine, Keimyung University School of Medicine, Daegu 42601, Korea;
| | - Kwang Seok Kim
- Division of Radiation Cancer Research, Korea Institute of Radiological & Medical Sciences, Seoul 01812, Korea; (K.S.K.); (I.-C.P.)
| | - Mikyung Kim
- Department of Biochemistry, Keimyung University School of Medicine, Daegu 42601, Korea; (M.K.); (J.H.S.)
| | - Ji Hae Seo
- Department of Biochemistry, Keimyung University School of Medicine, Daegu 42601, Korea; (M.K.); (J.H.S.)
| | - In-Chul Park
- Division of Radiation Cancer Research, Korea Institute of Radiological & Medical Sciences, Seoul 01812, Korea; (K.S.K.); (I.-C.P.)
| | - Min-Ji Kim
- Department of Molecular Medicine, Keimyung University School of Medicine, Daegu 42601, Korea; (T.J.); (M.J.K.); (Y.-R.S.); (S.-Y.P.); (M.-J.K.)
| | - Jae-Hoon Bae
- Department of Physiology, Keimyung University School of Medicine, Daegu 42601, Korea; (J.-H.B.); (D.-K.S.)
| | - Dae-Kyu Song
- Department of Physiology, Keimyung University School of Medicine, Daegu 42601, Korea; (J.-H.B.); (D.-K.S.)
| | - Chi Heum Cho
- Department of Obstetrics and Gynecology, Keimyung University School of Medicine, Daegu 42601, Korea;
| | - Jae-Ho Lee
- Department of Anatomy, Keimyung University School of Medicine, Daegu 42601, Korea;
- Correspondence: (J.-H.L.); (Y.-H.L.)
| | - Yun-Han Lee
- Department of Molecular Medicine, Keimyung University School of Medicine, Daegu 42601, Korea; (T.J.); (M.J.K.); (Y.-R.S.); (S.-Y.P.); (M.-J.K.)
- Correspondence: (J.-H.L.); (Y.-H.L.)
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Zhang Y, Wilson R, Heiss J, Breitling LP, Saum KU, Schöttker B, Holleczek B, Waldenberger M, Peters A, Brenner H. DNA methylation signatures in peripheral blood strongly predict all-cause mortality. Nat Commun 2017; 8:14617. [PMID: 28303888 PMCID: PMC5357865 DOI: 10.1038/ncomms14617] [Citation(s) in RCA: 166] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Accepted: 01/17/2017] [Indexed: 12/27/2022] Open
Abstract
DNA methylation (DNAm) has been revealed to play a role in various diseases. Here we performed epigenome-wide screening and validation to identify mortality-related DNAm signatures in a general population-based cohort with up to 14 years follow-up. In the discovery panel in a case-cohort approach, 11,063 CpGs reach genome-wide significance (FDR<0.05). 58 CpGs, mapping to 38 well-known disease-related genes and 14 intergenic regions, are confirmed in a validation panel. A mortality risk score based on ten selected CpGs exhibits strong association with all-cause mortality, showing hazard ratios (95% CI) of 2.16 (1.10–4.24), 3.42 (1.81–6.46) and 7.36 (3.69–14.68), respectively, for participants with scores of 1, 2–5 and 5+ compared with a score of 0. These associations are confirmed in an independent cohort and are independent from the ‘epigenetic clock'. In conclusion, DNAm of multiple disease-related genes are strongly linked to mortality outcomes. The DNAm-based risk score might be informative for risk assessment and stratification. DNA methylation is modulated by environmental factors and has a role in many complex diseases. Here, the authors find that methylation at specific DNA sites is associated with all-cause mortality, and a methylation-based risk score may be informative for risk assessment and stratification.
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Affiliation(s)
- Yan Zhang
- Division of Clinical Epidemiology and Aging Research, German Research Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany
| | - Rory Wilson
- Research Unit of Molecular Epidemiology, Helmholtz Zentrum München, German Center for Environmental Health, D-85764 Neuherberg, Germany.,Institute of Epidemiology II, Helmholtz Zentrum München, German Research Center for Environmental Health, D-85764 Neuherberg, Germany
| | - Jonathan Heiss
- Division of Clinical Epidemiology and Aging Research, German Research Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany
| | - Lutz P Breitling
- Division of Clinical Epidemiology and Aging Research, German Research Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany
| | - Kai-Uwe Saum
- Division of Clinical Epidemiology and Aging Research, German Research Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany
| | - Ben Schöttker
- Division of Clinical Epidemiology and Aging Research, German Research Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany.,Network Ageing Research, University of Heidelberg, Bergheimer Strasse 20, D-69115 Heidelberg, Germany
| | - Bernd Holleczek
- Saarland Cancer Registry, Präsident Baltz Strasse 5, D-66119 Saarbrücken, Germany
| | - Melanie Waldenberger
- Research Unit of Molecular Epidemiology, Helmholtz Zentrum München, German Center for Environmental Health, D-85764 Neuherberg, Germany.,Institute of Epidemiology II, Helmholtz Zentrum München, German Research Center for Environmental Health, D-85764 Neuherberg, Germany
| | - Annette Peters
- Research Unit of Molecular Epidemiology, Helmholtz Zentrum München, German Center for Environmental Health, D-85764 Neuherberg, Germany.,Institute of Epidemiology II, Helmholtz Zentrum München, German Research Center for Environmental Health, D-85764 Neuherberg, Germany
| | - Hermann Brenner
- Division of Clinical Epidemiology and Aging Research, German Research Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany.,Division of Preventive Oncology, German Cancer Research Center (DKFZ) and National Center for Tumor Diseases (NCT), Im Neuenheimer Feld 460, D-69120 Heidelberg, Germany.,German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany
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Honjo Y, Ayaki T, Tomiyama T, Horibe T, Ito H, Mori H, Takahashi R, Kawakami K. Increased GADD34 in oligodendrocytes in Alzheimer's disease. Neurosci Lett 2015; 602:50-5. [PMID: 26142647 DOI: 10.1016/j.neulet.2015.06.052] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Revised: 06/21/2015] [Accepted: 06/29/2015] [Indexed: 12/24/2022]
Abstract
Alzheimer's disease (AD) is characterized by the accumulation of amyloid-β (Aβ) and abnormally phosphorylated tau which contribute to endoplasmic reticulum (ER) stress. Previous studies demonstrated that Aβ and a truncated fragment of Aβ induced death of oligodendrocytes in vitro. In addition, a triple-transgenic AD mouse model exhibits significant region-specific alterations in myelination patterns at time points preceding the appearance of Aβ accumulation. The growth arrest and DNA damage protein (GADD) 34 is up-regulated in response to ER stress and regulates subunit of protein phosphatase 1 (PP1) complex that dephosphorylates eukaryotic translation initiator factor 2α (elF2α). Thus, GADD34 is known as an ER stress regulator or ER stress marker. In a recent study, GADD34 was induced in the spinal cord glial cells of an amyotrophic lateral sclerosis (ALS) mouse model. It is interesting that reduced GADD34 delayed the onset of ALS and prolonged the survival period in the mouse model. In this study, we have demonstrated that GADD34 was increased in neurons of human AD brains. Additionally, this finding was also observed in oligodendrocytes in human AD brains. Furthermore, we showed that the expression levels of GADD34 in neurons and oligodendrocytes were significantly increased in the early stage of AD in the mouse model. As oligodendrocytes were more affected in the early stages of AD in this experimental model, ER stress of Aβ oligomers may be more related to oligodendrocytes than to neurons. These results suggest that GADD34 could be a therapeutic target for preventing ER stress in neuronal cells in AD.
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Affiliation(s)
- Yasuyuki Honjo
- Department of Pharmacoepidemiology, Graduate School of Medicine and Public Health, Kyoto University, Japan; Department of Neurology, Graduate School of Medicine, Kyoto University, Japan
| | - Takashi Ayaki
- Department of Neurology, Graduate School of Medicine, Kyoto University, Japan
| | - Takami Tomiyama
- Department of Neurology and Neuroscience, Osaka City University Medical School, Japan
| | - Tomohisa Horibe
- Department of Pharmacoepidemiology, Graduate School of Medicine and Public Health, Kyoto University, Japan
| | - Hidefumi Ito
- Department of Neurology, Graduate School of Medicine, Wakayama Medical University, Japan
| | - Hiroshi Mori
- Department of Clinical Neuroscience, Osaka City University Medical School, Japan
| | - Ryosuke Takahashi
- Department of Neurology, Graduate School of Medicine, Kyoto University, Japan
| | - Koji Kawakami
- Department of Pharmacoepidemiology, Graduate School of Medicine and Public Health, Kyoto University, Japan.
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McKelvey SM, Horgan KA, Murphy RA. Chemical form of selenium differentially influences DNA repair pathways following exposure to lead nitrate. J Trace Elem Med Biol 2015; 29:151-69. [PMID: 25023848 DOI: 10.1016/j.jtemb.2014.06.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Revised: 06/09/2014] [Accepted: 06/12/2014] [Indexed: 10/25/2022]
Abstract
Lead, an environmental toxin is known to induce a broad range of physiological and biochemical dysfunctions in humans through a number of mechanisms including the deactivation of antioxidants thus leading to generation of reactive oxygen species (ROS) and subsequent DNA damage. Selenium on the other hand has been proven to play an important role in the protection of cells from free radical damage and oxidative stress, though its effects are thought to be form and dose dependent. As the liver is the primary organ required for metabolite detoxification, HepG2 cells were chosen to assess the protective effects of various selenium compounds following exposure to the genotoxic agent lead nitrate. Initially DNA damage was quantified using a comet assay, gene expression patterns associated with DNA damage and signalling were also examined using PCR arrays and the biological pathways which were most significantly affected by selenium were identified. Interestingly, the organic type selenium compounds (selenium yeast and selenomethionine) conferred protection against lead induced DNA damage in HepG2 cells; this is evident by reduction in the quantity of DNA present in the comet tail of cells cultured in their presence with lead. This trend also followed through the gene expression changes noted in DNA damage pathways analysed. These results were in contrast with those of inorganic sodium selenite which promoted lead induced DNA damage evident in both the comet assay results and the gene expression analysis. Over all this study provided valuable insights into the effects which various selenium compounds had on the DNA damage and signalling pathway indicating the potential for using organic forms of selenium such as selenium enriched yeast to protect against DNA damaging agents.
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Affiliation(s)
- Shauna M McKelvey
- Alltech Biotechnology Centre, Sarney, Summerhill Rd., Dunboyne, County Meath, Ireland.
| | - Karina A Horgan
- Alltech Biotechnology Centre, Sarney, Summerhill Rd., Dunboyne, County Meath, Ireland
| | - Richard A Murphy
- Alltech Biotechnology Centre, Sarney, Summerhill Rd., Dunboyne, County Meath, Ireland
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Masud R, Shameer K, Dhar A, Ding K, Kullo IJ. Gene expression profiling of peripheral blood mononuclear cells in the setting of peripheral arterial disease. J Clin Bioinforma 2012; 2:6. [PMID: 22409835 PMCID: PMC3381689 DOI: 10.1186/2043-9113-2-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2011] [Accepted: 03/12/2012] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Peripheral arterial disease (PAD) is a relatively common manifestation of systemic atherosclerosis that leads to progressive narrowing of the lumen of leg arteries. Circulating monocytes are in contact with the arterial wall and can serve as reporters of vascular pathology in the setting of PAD. We performed gene expression analysis of peripheral blood mononuclear cells (PBMC) in patients with PAD and controls without PAD to identify differentially regulated genes. METHODS PAD was defined as an ankle brachial index (ABI) ≤0.9 (n = 19) while age and gender matched controls had an ABI > 1.0 (n = 18). Microarray analysis was performed using Affymetrix HG-U133 plus 2.0 gene chips and analyzed using GeneSpring GX 11.0. Gene expression data was normalized using Robust Multichip Analysis (RMA) normalization method, differential expression was defined as a fold change ≥1.5, followed by unpaired Mann-Whitney test (P < 0.05) and correction for multiple testing by Benjamini and Hochberg False Discovery Rate. Meta-analysis of differentially expressed genes was performed using an integrated bioinformatics pipeline with tools for enrichment analysis using Gene Ontology (GO) terms, pathway analysis using Kyoto Encyclopedia of Genes and Genomes (KEGG), molecular event enrichment using Reactome annotations and network analysis using Ingenuity Pathway Analysis suite. Extensive biocuration was also performed to understand the functional context of genes. RESULTS We identified 87 genes differentially expressed in the setting of PAD; 40 genes were upregulated and 47 genes were downregulated. We employed an integrated bioinformatics pipeline coupled with literature curation to characterize the functional coherence of differentially regulated genes. CONCLUSION Notably, upregulated genes mediate immune response, inflammation, apoptosis, stress response, phosphorylation, hemostasis, platelet activation and platelet aggregation. Downregulated genes included several genes from the zinc finger family that are involved in transcriptional regulation. These results provide insights into molecular mechanisms relevant to the pathophysiology of PAD.
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Affiliation(s)
- Rizwan Masud
- Division of Cardiovascular Diseases, Mayo Clinic, Rochester MN 55905, USA
| | - Khader Shameer
- Division of Cardiovascular Diseases, Mayo Clinic, Rochester MN 55905, USA
| | - Aparna Dhar
- Division of Cardiovascular Diseases, Mayo Clinic, Rochester MN 55905, USA
| | - Keyue Ding
- Division of Cardiovascular Diseases, Mayo Clinic, Rochester MN 55905, USA
| | - Iftikhar J Kullo
- Division of Cardiovascular Diseases, Mayo Clinic, Rochester MN 55905, USA
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Song MK, Kim YJ, Song M, Choi HS, Park YK, Ryu JC. Formation of a 3,4-diol-1,2-epoxide metabolite of benz[a]anthracene with cytotoxicity and genotoxicity in a human in vitro hepatocyte culture system. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2012; 33:212-225. [PMID: 22236718 DOI: 10.1016/j.etap.2011.12.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2011] [Revised: 12/15/2011] [Accepted: 12/19/2011] [Indexed: 05/31/2023]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) are environmental pollutants that require metabolic activation to exert their carcinogenic effects. This study investigated the 3,4-diol-1,2-epoxide formation of benz[a]anthracene (BA) and its toxic effects in a human in vitro hepatocyte culture system. Both mRNA and protein expression of metabolic enzymes which can activate PAHs to carcinogenic forms increased after BA exposure in HepG2 cells and our quantitative analysis showed that the formation of BA-3,4-diol-1,2-epoxide in medium extracts increased in a time-dependent manner. We also performed several comparative studies which show that much lower concentrations of BA-3,4-diol-1,2-epoxide had stronger cytotoxicity and genotoxicity than higher doses of BA. These results suggest that BA is activated as the major carcinogenic metabolite 3,4-diol-1,2-epoxide, in human in vitro culture systems by metabolic enzymes and that this metabolite has stronger cytotoxic and genotoxic effects than its parent compound.
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Affiliation(s)
- Mi-Kyung Song
- Cellular and Molecular Toxicology Laboratory, Korea Institute of Science & Technology, PO Box 131, Cheongryang, Seoul, 130-650, Republic of Korea
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Singh A, Redden JM, Kapiloff MS, Dodge-Kafka KL. The large isoforms of A-kinase anchoring protein 18 mediate the phosphorylation of inhibitor-1 by protein kinase A and the inhibition of protein phosphatase 1 activity. Mol Pharmacol 2010; 79:533-40. [PMID: 21149637 DOI: 10.1124/mol.110.065425] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Inhibitor-1 (I-1) is phosphorylated on threonine residue 35 (Thr35) by the cAMP-dependent protein kinase (PKA), inducing the potent inhibition of the serine-threonine-specific protein phosphatase 1 (PP1). We now report that the formation of a signaling complex containing PKA and I-1 by the A-kinase anchoring protein 18 (AKAP18) facilitates this regulation in cells. AKAP18 directly bound I-1, and AKAP18/I-1 complexes were isolated from both rat heart extract and transfected heterologous cells. It is noteworthy that prevention of PKA binding to the AKAP18 scaffold decreased I-1 phosphorylation by 48% in cells. Moreover, the I-1 target PP1 was also associated with AKAP18 complexes. The cAMP-mediated inhibition of phosphatase activity was contingent on PKA binding to the scaffold. These observations reveal an additional level of complexity in PP1 regulation because of its association with AKAP18 multimolecular signaling complexes and suggest that targeting of AKAP18 complexes may be an alternative method to alter phosphatase activity and modulate specific substrate dephosphorylation.
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Affiliation(s)
- Arpita Singh
- Pat and Jim Calhoun Center for Cardiology, University of Connecticut Health Center, Farmington, CT 06032, USA
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Identification of deregulated genes by single wall carbon-nanotubes in human normal bronchial epithelial cells. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2010; 6:563-9. [DOI: 10.1016/j.nano.2009.12.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2009] [Revised: 10/12/2009] [Accepted: 12/07/2009] [Indexed: 01/24/2023]
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