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- W2129960219 startingPage "1371" @default.
- W2129960219 abstract "Overexpression of cyclooxygenase-2 (COX-2) is seen in a high percentage of human colon tumors, lung adenocarcinomas and other cancers. Inhibition of this enzyme represses human colon tumorigenesis and decreases lung tumor multiplicity in 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone-exposed A/J mice. The purpose of this investigation was to characterize the expression of cyclooxygenase-2 (COX-2) during tumor progression in the A/J mouse lung and to compare the results with expression in other cancer-susceptible and several cancer-resistant mouse strains. Analysis of normal A/J mouse lung showed that type II alveolar epithelial cells express high levels of COX-2 protein and mRNA, indicating that COX-2 is present constitutively in this tumor progenitor cell prior to any carcinogen exposure. Examination of lung-cancer-resistant (C3H/HeJ, C57BL/6J, DBA/2J) and other lung-cancer-susceptible (A/WySnJ, SWR/J) strains showed similar levels of COX-2 mRNA expression in the three susceptible strains and lower levels of expression in two of the resistant strains, indicating a possible correlation between COX-2 expression in type II cells and lung cancer susceptibility. COX-2 protein expression was observed in A/J lung tumors at all stages of development. Variation and occasional absence of protein expression were also observed in A/J lung tumors, particularly in adenomas and adenocarcinomas, suggesting that COX-2 is not obligatory for maintenance of the malignant phenotype. In support of this conclusion, treatment of xenografted cell lines derived from malignant murine pulmonary tumors with COX-2 inhibitors produced only a slight repression of growth. However, the frequent expression of COX-2 in early lesions in the A/J mouse lung combined with the known reduction in tumor number in animals treated with COX-2 inhibitors prior to carcinogen exposure indicate that COX-2 could be a promising target for lung cancer chemoprevention. In addition, high levels of COX-2 expression in the normal tumor-progenitor cells of lung-cancer-sensitive mice indicate that COX-2 may play a role in lung cancer susceptibility." @default.
- W2129960219 created "2016-06-24" @default.
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- W2129960219 date "2000-07-01" @default.
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- W2129960219 title "Cyclooxygenase-2 expression is abundant in alveolar type II cells in lung cancer-sensitive mouse strains and in premalignant lesions" @default.
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- W2129960219 doi "https://doi.org/10.1093/carcin/21.7.1371" @default.
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