Abbreviations: ETS=environmental tobacco smoke; SH = spontaneously hypertensive Global gene expression profile analysis can be utilized to derive molecular footprints to understand biochemical pathways implicated in the origin and progression of disease.

Abbreviations: ETS=environmental tobacco smoke; SH = spontaneously hypertensive

Global gene expression profile analysis can be utilized to derive molecular footprints to understand biochemical pathways implicated in the origin and progression of disease. Functional genomics efforts with tissue-specific focused gene array appears to be the in the greatest degree reasonable approach to derive relevant and meaningful information. In our efforts to understand the molecular basis for the toxicity and exacerbations in susceptible populations to environmental exposing s we are developing a gene expression database for a rat cardiopulmonary disease prototype exposed to air pollutants. The spontaneously hypertensive (SH) rat with underlying cardiovascular and pulmonary disease risk is being utilized toward these efforts. SH rats with polygenic traits toward hypertension exhibit similar heritable risk factors that are institute in patients with COPD. We have shown that SH rats are more susceptible to lung injury/inflammation, and oxidative stres from position to combustion source particles, and from experimental induction of pulmonary disease compared to healthy normotensive Wistar rats. SH rats also elicited an inflammatory replication to ETS exposure, which is les remarkable in other conventional rat strains used in laboratory studies. To understand the molecular basis for the inflammatory reply we screened for a pulmonary gene expression profile in SH rats expos to ET Male SH rats (12 weeks old) were expos either to filtered air or ET at 90 mg/[msup3] for 6 h/d for 2 consecutive days; forward the third day, total RNA was isolated from right lung lobes. Pulmonary gene expression was assayed according to hybridizing [sup.32]p-labeled complementary DNA generated from total RNA to Atlas Rat complementary DNA expression array filter containing 588 gene (Clontech; Palo Alto, CA). Gene expression profile data indicated sinewy hybridization signals for 40 gene including N-myc, p53 transforming growing factor-[beta], p21, bax-[alpha] and cytokine macrophage inflammatory protein-2. Pairwise comparison indicated ET exposure-associated differential expression in 16 genes: increased expression of CYPIA1, calcium interrogate RhoGAP, p122, and decreased expression of bile salt-activated lipase precursor, a fatty acid binding protein and fatty acid amide hydrolase. ET induced a duplicate to threefold increase in macrophage inflammatory protein-2 expression, suggesting lung injury and inflammation. Overexpression of matrix metalloproteinase-7 moves a possible release of proteases from ETS-induced infiltration of neutrophils into the airways, consistent with our earlier observations. Increased expression of p27(Kip1), caspase-1, and Stat3 observ in the current study further supports apoptosis of infiltrating neutrophils in the lung following aspect to ETS. Efforts are underway to explore whether long-term ET exposing of SH rats will lead to a chronic disease state. A comprehensive expression database indicating ETS-induced changes in susceptible animal examples will provide identification and the part of risk factors in understanding health results of ETS and other environmental pollutant-induced cardiopulmonary disease.

* From the Pulmonary Toxicology Branch (Dr Nadadur and Kodavanti), Environmental Toxicology Division, National Health and Environmental weights Research Laboratory, Office of Research and unravelling United States Environmental Protection Agency, Research Triangle Park, NC; and Department of Anatomy (Dr Pinkerton), Physiology and small room Biology, School of Veterinary Medicine, University of California, Davis, CA.

This article does not bring reproach US Environmental Protection Agency policy.

Correspondence to: Srikanth s Nadadur, PhD, Pulmonary Toxicology Branch, Mail globule 82, National Health and Environmental imports Research Laboratory, Research Triangle Park, NC 27711; e-mail: nadadur.srikanth@epa.gov.

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