Am. J. Respir. Crit. Care Med., Volume 164, Number 10, November 2001, S85-S89

Development of High-density DNA Microarray Membrane for Profiling Smoke- and Hydrogen Peroxide-induced Genes in a Human Bronchial Epithelial Cell Line

KEN YONEDA, KONAN PECK, MARY MANN-JONG CHANG, KEN CHMIEL, YUH-PYNG SHER, JEREMY CHEN, PAN-CHYR YANG, YIN CHEN, and REEN WU

Center for Comparative Respiratory Biology and Medicine, Department of Internal Medicine, University of California at Davis, California; Institute of Biomedical Sciences, Academia Sinica and National Taiwan University Hospital, Taipei, Taiwan, Republic of China

Development of the high-density DNA microarray technique permits the analysis of thousands of genes simultaneously for their differential expression patterns in various biological processes. Through clustering analysis and pattern recognition, the significance of differentially expressed genes can be recognized and correlated with biological events that may take place inside the cell and tissue. With this notion in mind, high-density DNA microarray nylon membrane with colorimetry detection was used to profile the expression of smoke- and hydrogen peroxide-inducible genes in a human bronchial epithelial cell line, HBE1. On the basis of the time course of expression, at least three phases of change in gene expression could be recognized. The first phase is an immediate event in response to oxidant injury. This phase includes induction of the bcl-2 and mdm-2 genes, which are involved in the regulation of apoptosis, and the mitogen-activated protein (MAP) kinase phosphatase 1 (MKP-1) gene, that functions as a regulator of various mitogen-activated protein kinase activities. The second phase, usually 5 h later, includes the induction of various stress proteins and ubiquitin, which are important in providing the chaperone mechanism and the turnover of damaged macromolecules. The third phase, which is 5-10 h later, includes the induction of genes that are apparently involved in reducing oxidative stress by metabolizing reactive oxygen species. In this phase, enzymes associated with tissue and cell remodeling are also elevated. These results demonstrate a complex gene expression array by bronchial epithelial cells in response to the insult of oxidants that are relevant to environmental pollutants.

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