Abstract
We previously reported that the sustained exposure of human urothelial cells (HUCs) to low-dose sodium arsenite induces changes in the gene expression profile and neoplastic transformation. In this study, we used the HumanMethylation27 BeadChip to analyze genome-wide methylation profiles and 5-aza-2′-deoxycytidine to examine the involvement of promoter methylation in gene expression. Because the expression of lipocalin-2 (LCN2) was highly enhanced by promoter hypomethylation in inorganic arsenic (iAs)-HUCs cells as well as bladder cancer tissues, we further showed that mutations at the binding sequences for NF-κB and C/EBP-α significantly reduced LCN2 promoter activity. By chromatin immunoprecipitation assay, we demonstrated the significantly increased binding of RelA (p65) and NF-κB1 (p50) to the hypomethylated promoter of LCN2 in the iAs-HUCs. Furthermore, we also demonstrated that LCN2 overexpression was crucial for the neoplastic characteristics of the iAs-HUCs, such as enhanced anchorage-independent growth, resistance to serum deprivation and activation of NF-κB signaling. In addition, our results indicated that enhanced NF-κB activity in iAs-HUCs was via LCN2-mediated increase in intracellular iron and reactive oxygen species levels. Taken together, our results show that sustained low-dose arsenic exposure results in epigenetic changes and enhanced oncogenic potential via LCN2 overexpression.
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References
Benbrahim-Tallaa L, Waterland RA, Styblo M, Achanzar WE, Webber MM, Waalkes MP (2005) Molecular events associated with arsenic-induced malignant transformation of human prostatic epithelial cells: aberrant genomic DNA methylation and K-ras oncogene activation. Toxicol Appl Pharmacol 206(3):288–298. doi:10.1016/j.taap.2004.11.017
Bibikova M, Le J, Barnes B, Saedinia-Melnyk S, Zhou L, Shen R, Gunderson KL (2009) Genome-wide DNA methylation profiling using Infinium(R) assay. Epigenomics 1(1):177–200. doi:10.2217/epi.09.14
Boekelheide K, Blumberg B, Chapin RE, Cote I, Graziano JH, Janesick A, Lane R, Lillycrop K, Myatt L, States JC, Thayer KA, Waalkes MP, Rogers JM (2012) Predicting later-life outcomes of early-life exposures. Environ Health Perspect 120(10):1353–1361. doi:10.1289/ehp.1204934
Borkham-Kamphorst E, Drews F, Weiskirchen R (2011) Induction of lipocalin-2 expression in acute and chronic experimental liver injury moderated by pro-inflammatory cytokines interleukin-1beta through nuclear factor-kappaB activation. Liver Int 31(5):656–665. doi:10.1111/j.1478-3231.2011.02495.x
Chakraborty S, Kaur S, Guha S, Batra SK (2012) The multifaceted roles of neutrophil gelatinase associated lipocalin (NGAL) in inflammation and cancer. Biochim Biophys Acta 1826(1):129–169. doi:10.1016/j.bbcan.2012.03.008
Chanda S, Dasgupta UB, Guhamazumder D, Gupta M, Chaudhuri U, Lahiri S, Das S, Ghosh N, Chatterjee D (2006) DNA hypermethylation of promoter of gene p53 and p16 in arsenic-exposed people with and without malignancy. Toxicol Sci 89(2):431–437. doi:10.1093/toxsci/kfj030
Chen YC, Su HJ, Guo YL, Hsueh YM, Smith TJ, Ryan LM, Lee MS, Christiani DC (2003) Arsenic methylation and bladder cancer risk in Taiwan. Cancer Causes Control 14(4):303–310
Chen H, Li SF, Liu J, Diwan BA, Barrett JC, Waalkes MP (2004) Chronic inorganic arsenic exposure induces hepatic global and individual gene hypomethylation: implications for arsenic hepatocarcinogenesis. Carcinogenesis 25(9):1779–1786. doi:10.1093/carcin/bgh161
Cowland JB, Sorensen OE, Sehested M, Borregaard N (2003) Neutrophil gelatinase-associated lipocalin is up-regulated in human epithelial cells by IL-1 beta, but not by TNF-alpha. J Immunol 171(12):6630–6639
Cui X, Wakai T, Shirai Y, Hatakeyama K, Hirano S (2006) Chronic oral exposure to inorganic arsenate interferes with methylation status of p16INK4a and RASSF1A and induces lung cancer in A/J mice. Toxicol Sci 91(2):372–381. doi:10.1093/toxsci/kfj159
Flo TH, Smith KD, Sato S, Rodriguez DJ, Holmes MA, Strong RK, Akira S, Aderem A (2004) Lipocalin 2 mediates an innate immune response to bacterial infection by sequestrating iron. Nature 432(7019):917–921. doi:10.1038/nature03104
Flower DR, North AC, Sansom CE (2000) The lipocalin protein family: structural and sequence overview. Biochim Biophys Acta 1482(1–2):9–24. doi:10.1016/S0167-4838(00)00148-5
Galaris D, Pantopoulos K (2008) Oxidative stress and iron homeostasis: mechanistic and health aspects. Crit Rev Clin Lab Sci 45(1):1–23. doi:10.1080/10408360701713104
Goering PL, Aposhian HV, Mass MJ, Cebrian M, Beck BD, Waalkes MP (1999) The enigma of arsenic carcinogenesis: role of metabolism. Toxicol Sci 49(1):5–14
Jones PA (2012) Functions of DNA methylation: islands, start sites, gene bodies and beyond. Nat Rev Genet 13(7):484–492. doi:10.1038/nrg3230
Klose RJ, Bird AP (2006) Genomic DNA methylation: the mark and its mediators. Trends Biochem Sci 31(2):89–97. doi:10.1016/j.tibs.2005.12.008
Lannetti A, Pacifico F, Acquaviva R, Lavorgna A, Crescenzi E, Vascotto C, Tell G, Salzano AM, Scaloni A, Vuttariello E, Chiappetta G, Formisano S, Leonardi A (2008) The neutrophil gelatinase-associated lipocalin (NGAL), a NF-kappa B-regulated gene, is a survival factor for thyroid neoplastic cells. Proc Natl Acad Sci USA 105(37):14058–14063. doi:10.1073/pnas.0710846105
Lee S, Kim JH, Seo JW, Han HS, Lee WH, Mori K, Nakao K, Barasch J, Suk K (2011) Lipocalin-2 is a chemokine inducer in the central nervous system: role of chemokine ligand 10 (CXCL10) in lipocalin-2-induced cell migration. J Biol Chem 286(51):43855–43870. doi:10.1074/jbc.M111.299248
Leng X, Ding T, Lin H, Wang Y, Hu L, Hu J, Feig B, Zhang W, Pusztai L, Symmans WF, Wu Y, Arlinghaus RB (2009) Inhibition of lipocalin 2 impairs breast tumorigenesis and metastasis. Cancer Res 69(22):8579–8584. doi:10.1158/0008-5472.can-09-1934
Li C, Chan YR (2011) Lipocalin 2 regulation and its complex role in inflammation and cancer. Cytokine 56(2):435–441. doi:10.1016/j.cyto.2011.07.021
Li SH, Hawthorne VS, Neal CL, Sanghera S, Xu J, Yang J, Guo H, Steeg PS, Yu D (2009) Upregulation of neutrophil gelatinase-associated lipocalin by ErbB2 through nuclear factor-kappaB activation. Cancer Res 69(24):9163–9168. doi:10.1158/0008-5472.can-09-2483
Lin HH, Liao CJ, Lee YC, Hu KH, Meng HW, Chu ST (2011) Lipocalin-2-induced cytokine production enhances endometrial carcinoma cell survival and migration. Int J Biol Sci 7(1):74–86
Mahadevan NR, Rodvold J, Almanza G, Perez AF, Wheeler MC, Zanetti M (2011) ER stress drives lipocalin 2 upregulation in prostate cancer cells in an NF-kappaB-dependent manner. BMC Cancer 11:229. doi:10.1186/1471-2407-11-229
Mass MJ, Wang LJ (1997) Arsenic alters cytosine methylation patterns of the promoter of the tumor suppressor gene p53 in human lung cells: a model for a mechanism of carcinogenesis. Mutat Res Rev Mutat Res 386(3):263–277. doi:10.1016/s1383-5742(97)00008-2
Rahman MM, Ng JC, Naidu R (2009) Chronic exposure of arsenic via drinking water and its adverse health impacts on humans. Environ Geochem Health 31(Suppl 1):189–200. doi:10.1007/s10653-008-9235-0
Reichard JF, Puga A (2010) Effects of arsenic exposure on DNA methylation and epigenetic gene regulation. Epigenomics 2(1):87–104. doi:10.2217/epi.09.45
Reichard JF, Schnekenburger M, Puga A (2007) Long term low-dose arsenic exposure induces loss of DNA methylation. Biochem Biophys Res Commun 352(1):188–192. doi:10.1016/j.bbrc.2006.11.001
Ren X, McHale CM, Skibola CF, Smith AH, Smith MT, Zhang L (2011) An emerging role for epigenetic dysregulation in arsenic toxicity and carcinogenesis. Environ Health Perspect 119(1):11–19. doi:10.1289/ehp.1002114
Rodvold JJ, Mahadevan NR, Zanetti M (2012) Lipocalin 2 in cancer: when good immunity goes bad. Cancer Lett 316(2):132–138. doi:10.1016/j.canlet.2011.11.002
Rossman TG (2003) Mechanism of arsenic carcinogenesis: an integrated approach. Mutat Res Fundam Mol Mech Mutagen 533(1–2):37–65. doi:10.1016/j.mrfmmm.2003.07.009
Sciandrello G, Caradonna F, Mauro M, Barbata G (2004) Arsenic-induced DNA hypomethylation affects chromosomal instability in mammalian cells. Carcinogenesis 25(3):413–417. doi:10.1093/carcin/bgh029
Steinmaus C, Bates MN, Yuan Y, Kalman D, Atallah R, Rey OA, Biggs ML, Hopenhayn C, Moore LE, Hoang BK, Smith AH (2006) Arsenic methylation and bladder cancer risk in case–control studies in Argentina and the United States. J Occup Environ Med 48(5):478–488. doi:10.1097/01.jom.0000200982.28276.70
Su PF, Hu YJ, Ho IC, Cheng YM, Lee TC (2006) Distinct gene expression profiles in immortalized human urothelial cells exposed to inorganic arsenite and its methylated trivalent metabolites. Environ Health Perspect 114(3):394–403
Tong ZM, Wu XL, Ovcharenko D, Zhu JX, Chen CS, Kehrer JP (2005) Neutrophil gelatinase-associated lipocalin as a survival factor. Biochem J 391:441–448. doi:10.1042/bj20051020
Torti SV, Torti FM (2013) Iron and cancer: more ore to be mined. Nat Rev Cancer 13(5):342–355. doi:10.1038/nrc3495
Xiong S, She H, Takeuchi H, Han B, Engelhardt JF, Barton CH, Zandi E, Giulivi C, Tsukamoto H (2003) Signaling role of intracellular iron in NF-kappaB activation. J Biol Chem 278(20):17646–17654. doi:10.1074/jbc.M210905200
Xu G, Ahn J, Chang S, Eguchi M, Ogier A, Han S, Park Y, Shim C, Jang Y, Yang B, Xu A, Wang Y, Sweeney G (2012) Lipocalin-2 induces cardiomyocyte apoptosis by increasing intracellular iron accumulation. J Biol Chem 287(7):4808–4817. doi:10.1074/jbc.M111.275719
Yan L, Borregaard N, Kjeldsen L, Moses MA (2001) The high molecular weight urinary matrix metalloproteinase (MMP) activity is a complex of gelatinase B/MMP-9 and neutrophil gelatinase-associated lipocalin (NGAL). Modulation of MMP-9 activity by NGAL. J Biol Chem 276(40):37258–37265. doi:10.1074/jbc.M106089200
Yan QW, Yang Q, Mody N, Graham TE, Hsu CH, Xu Z, Houstis NE, Kahn BB, Rosen ED (2007) The adipokine lipocalin 2 is regulated by obesity and promotes insulin resistance. Diabetes 56(10):2533–2540. doi:10.2337/db07-0007
Yang J, Goetz D, Li JY, Wang W, Mori K, Setlik D, Du T, Erdjument-Bromage H, Tempst P, Strong R, Barasch J (2002) An iron delivery pathway mediated by a lipocalin. Mol Cell 10(5):1045–1056
Yang J, Bielenberg DR, Rodig SJ, Doiron R, Clifton MC, Kung AL, Strong RK, Zurakowski D, Moses MA (2009) Lipocalin 2 promotes breast cancer progression. Proc Natl Acad Sci USA 106(10):3913–3918. doi:10.1073/pnas.0810617106
Zhao CQ, Young MR, Diwan BA, Coogan TP, Waalkes MP (1997) Association of arsenic-induced malignant transformation with DNA hypomethylation and aberrant gene expression. Proc Natl Acad Sci USA 94(20):10907–10912. doi:10.1073/pnas.94.20.10907
Acknowledgments
We thank the Institute of Biomedical Sciences, Academia Sinica (IBMS-CRC97-P01) and the National Science Council, Taiwan (NSC97-2314-B-001-003-MY3, NSC98-2320-B-001-002-MY3) for the grant supporting, the Sequencing Core Facility, Scientific Instrument Center at Academia Sinica for DNA sequencing, Dr. Jiunn-Liang Ko (Chung-Shan Medical University, Taichung) for providing the LCN2 promoter luciferase vector.
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Wang, HH., Wu, MM., Chan, M.W.Y. et al. Long-term low-dose exposure of human urothelial cells to sodium arsenite activates lipocalin-2 via promoter hypomethylation. Arch Toxicol 88, 1549–1559 (2014). https://doi.org/10.1007/s00204-014-1214-x
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DOI: https://doi.org/10.1007/s00204-014-1214-x