Genomic and proteomic profiling of responses to toxic metals in human lung cells

被引:190
作者
Andrew, AS
Warren, AJ
Barchowsky, A
Temple, KA
Klei, L
Soucy, NV
O'Hara, KA
Hamilton, JW
机构
[1] Dartmouth Coll Sch Med, Dept Pharmacol & Toxicol, Lebanon, NH 03756 USA
[2] Dartmouth Coll, Environm Hlth Sci Ctr, Hanover, NH 03755 USA
[3] Dartmouth Hitchcock Med Ctr, Norris Cotton Canc Ctr, Lebanon, NH 03766 USA
关键词
arsenic; cadmium; chromium; DNA microarray; hypoxia inducible factor-1 alpha; kinase; mitomycin C; nickel; toxicogenomics; toxicoproteomics;
D O I
10.1289/ehp.111-1241504
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Examining global effects of toxic metals on gene expression can be useful for elucidating patterns of biological response, discovering underlying mechanisms of toxicity, and identifying candidate metal-specific genetic markers of exposure and response. Using a 1,200 gene nylon array, we examined changes in gene expression following low-dose, acute exposures of cadmium, chromium, arsenic, nickel, or mitomycin C (MMC) in BEAS-2B human bronchial epithelial cells. Total RNA was isolated from cells exposed to 3 muM Cd(II) (as cadmium chloride), 10 muM Cr(VI) (as sodium dichromate), 3 mug/cm(2) Ni(II) (as nickel subsulfide), 5 muM or 50 muM As(Ill) (as sodium arsenite), or I muM MMC for 4 hr. Expression changes were verified at the protein level for several genes. Only a small subset of genes was differentially expressed in response to each agent: Cd, Cr, Ni, As (5 muM), As (50 muM), and MMC each differentially altered the expression of 25, 44, 31, 110, 65, and 16 individual genes, respectively. Few genes were commonly expressed among the various treatments. Only one gene was altered in response to all four metals (hsp90), and no gene overlapped among all five treatments. We also compared low-dose (5 muM, noncytotoxic) and high-dose (50 muM, cytotoxic) arsenic treatments, which surprisingly, affected expression of almost completely nonoverlapping subsets of genes, suggesting a threshold switch from a survival-based biological response at low doses to a death response at high doses.
引用
收藏
页码:825 / 838
页数:14
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